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Drilling. Mining

Behnam Lotfi, Karim Salahshoor Adaptive control of well drilling systems // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 1-17. http://www.ogbus.ru/eng/authors/LotfiB/LotfiB_1.pdf 

Control of well drilling operations poses a challenging issue to be tackled. Loss of well control could lead to occurrence of blowout as a severe threat, involving the risk of human lives and environmental and economic consequences. Conventional Proportional-Integral (PI) controller is a common practice in the well control operation. The small existing margin between pore pressure and fracture gradients jeopardizes the efficiency of this conventional method to exercise an accurate and precise pressure control. There is a significant incentive to develop more efficient control methodologies to precisely control the annular pressure profile throughout the well bore to ascertain the down-hole pressure environment limits. Adaptive control presents an attractive candidate approach to achieve these demanding goals through adjusting itself to the changes during well drilling operation. The paper presents a set of adaptive control paradigms in the form of self-tuning control (STC). The developed STCs are comparatively evaluated on a simulated well drilling benchmark case study for both regulatory and servo-tracking control objectives. Different sets of test scenarios are conducted to represent the superior performance of the developed STC methods compared to the conventional PI control approach.

Keywords: adaptive control, self-tuning control, well drilling system, industry is increasingly, PI-regulator, controller aims

Masoud Homayounizadeh, Khalil Shahbazi, Seyed Reza Shadizadeh The experimental study of formation damage during underbalanced drilling caused by spontaneous imbibition in fractured reservoirs // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 18-25. http://www.ogbus.ru/eng/authors/MasoudH/MasoudH_1.pdf 

In conventional drilling, high mud weight can create a large overbalance pressure between the wellbore and reservoir. This overbalance can result in the invasion of mud filtrate, drilled solids and foreign fluids into the formation. Subsequently, this overbalance causes significant formation damage, and reduced productivity, thus requiring further costly stimulation operation such as acidizing and hydraulic fracturing.

Underbalanced drilling (UBD) is a drilling operation in which the circulating drilling fluid pressure is less than formation pore pressure. Underbalanced technology may be very successful in decreasing or eliminating formation damage if properly executed. However, the advantage of underbalanced drilling can be lost in case of short pulse overbalanced conditions or in case of spontaneous imbibition.

During a UBD operation, due to existence of capillary forces and wettability characteristic, especially in low permeable zones, the drilling fluid imbibes into the reservoir rocks in opposite direction due to the reservoir fluids and consequently formation damage can occur. Several parameters, e.g. pressure difference or exposure time, can affect the severity and magnitude of this kind of damage.

The main goal of this study’s determining the saturation profile of imbibed drilling fluid and consequently evaluating the magnitude of formation damage which occurs in underbalanced drilling. Four sandstone plugs with a single longitudinal fracture with open ends were used in experiments. The plugs were exposed to different experimental conditions to measure the effect of various parameters, e.g. exposure time and overburden pressure, on the severity of the damage. In the next step, the actual saturation profile of imbibed water was determined by the X-ray computed tomography (CT scan) technique. It is shown that for lower underbalanced differential pressure, higher exposure time and lower drilling fluid viscosity, fluid invasion will increase.

Keywords: formation damage, fractured reservoirs, counter-current spontaneous imbibition, underbalanced drilling; X-ray computed tomography

N.A. Shamov, V.Yu. Artamonov. Wave processes in annulus cement grouting compaction technology // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 26-33. http://www.ogbus.ru/authors/Shamov/Shamov_2.pdf 

Intensive oscillation of the thin wall tube turned in the cement annulus moving particles and aggregates its solid phase, vibrational and translational displacement which leads to the repackaging of particle formation of a more dense and homogeneous structure solution as in any tends to minimize the potential energy of the system.

The article discusses the creation of a powerful wave action, which contributes preparing a homogeneous cement and improving its engagement with the casing and the formation and delivers preparing of mud for drilling smaller diameter shafts for technical and operational columns. A schematic drawing of the technology functioning in the well is given.

Keywords: cementing, wave process, drilling fluid, wave generator, pressure amplitude

N.A. Shamov, V.Yu. Artamonov. By the mechanism of failure of rocks under high-speed roller-bit drilling and wave events at the bottom // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 34-45. http://www.ogbus.ru/authors/Shamov/Shamov_3.pdf 

The article describes features of hole formation during rock breaking with acuminate cutter tooth at the high speed roller bit drilling system. The effect of the pressure pulse generated by multiple bit cutter teeth is considered. Shown the pressure variation dynamics created by bit cutter tooth in the rock matrix. The mechanism of the effect of wave processes on the rock breaking and describes the results of the wave generator application.

To create the wave field in the hole with streaks, built of rocks with low strength to pressure variations, should be preferred spindle generators, which is substantially less than over-turbine generators, the pressure drop and correspondingly generated oscillations with lower pressure amplitudes.

Keywords: mud, rock matrix, bore hole bottom, drilling fluid, wave process, drilling bit

N.A. Shamov. Effect of bit speed on rop and tunneling // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 46-55. http://www.ogbus.ru/authors/Shamov/Shamov_4.pdf 

Until now, in practice, low speed drilling preferred technical means, such as rotation of the entire rotary drilling assembly and the use of downhole motors with high torque and high axial loads, including low speed gear turbodrills and downhole motors.

The article presents the advantages of turbodrill before downhole motors. The author describes the developed turbine section of high-speed turbo-drill with the spindle. As a result, reduced the flow of drilling fluid, hydrodynamic pressure on the reservoirs and pressure loss in drill pipes, risk of thick filter cakes, seals and tool stalling, especially in deviated and horizontal wellbores.

Keywords: turbo drill, downhole drilling motor, bit speed, bit, spindle, rolling cutter bit

N.A. Shamov, V.Yu. Artamonov. Wave processes in preparation technology solutions of drilling // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 56-65. http://www.ogbus.ru/authors/Shamov/Shamov_5.pdf 

The article focuses on the application of non-linear cavitation-wave processes in the technology of drilling fluids preparation.

In processing the dispersion system is divided into four zones: the active solid phase dispersing, the transitional zone, wave and hydrodynamic coagulation zone and sustainable structural and rheological solid mud equilibrium. Consequently in the drilling fluid forms a finely dispersed structure, filtrate return reduces, sedimentation stability increases, the static shear stress, the effective viscosity of the solution, abrasivity of drilling fluid reduces, well strengthening process is accelerating.

The use of drilling fluids in the local, lower expenses, yes imported materials by the use of technology in the preparation of drilling fluid cavitation-nonlinear wave processes is an important research and engineering and a practical task.

Keywords: well strengthening, pore throats, drilling fluid, mud, wave process, filtrate return

N.A. Shamov. Wave wellbore strengthening applying in drilling // Electronic scientific journal "Oil and Gas Business", 2013, Issue 3, pp. 66-74. http://www.ogbus.ru/authors/Shamov/Shamov_6.pdf 

The article describes the improved designs of kolmatators. Calibrating kolmatators by templating ribs reliably remove any filter cake, which prevents the colmatation process, from the well bore. The application of kolmatator-bit contributes high-speed colmatation of the new formed surface on the borehole during drilling. Cavitation-wave mud unit is also involved in the creation of a layer of wellbore strengthening.

Technical and design deficiencies of earlier applied constructions reduced the result efficiency of the wave wellbore strengthening. Originally vortex tubes manufactured from the steel as glasses, resulting in condition of highly abrasive drilling fluids and cavitation processes in fulminant wear out of branch pipe. Even replacing the material on siliconized graphite hasn’t helped complete solving the problem of reliability and durability of the replaceable vortex branch pipes. Changing the branch pipe design and material allowed to increase operational resource by more than an order.

Keywords: wellbore strengthening, filter cake, bit, wave process, drilling fluid, wave generator

Azizollah Khormali A new drilling method with open circuit system (cycle C) in top holes of Marun field in Iran // Electronic scientific journal "Oil and Gas Business", 2013, Issue 2, pp. 11-18. http://www.ogbus.ru/eng/authors/KhormaliA/KhormaliA_1.pdf 

In last the years, before beginning of drilling operation in 17.5 inch holes in Marun field, great amount of water is saved in earthen reserve pit to increase rate of drilling after running 18 5/8 casing to the depth of 100 meters and cementation, using a packed hole assembly, saved water in earthen reserve pits is directly pumped to hole with high velocity as a drilling fluid. Also by applying high weight on bit (WOB) and revolutions per minute (RPM), rate of penetration will be increased considerably. In these conditions, circulating system cannot refine drilling fluid because of large amount of cutting. Thus drilling mud is conducted to the earthen reserve pit to allow solid materials to settle there, and then free water is pumped to well again. High drilling rate observed by this method (1000 m/day).

In this paper, evaluation of drilling problems from the beginning to the end of 17.5 inch hole is considered. These problems are: leaning situation, crushing, stock pipe, hole deviation and cementation.

Keywords: earthen reserve bit, drilling fluid, WOB, RPM, drilling rate

U.G. Matveev, M.A. Lyagova, N.I. Vasilev, I.A. Lyagov. Features of analitical study of perfobur in curvilinear channels of small diameter and radius of curvature // Electronic scientific journal "Oil and Gas Business", 2013, Issue 1, pp. 37-58. http://www.ogbus.ru/authors/MatveevUG/MatveevUG_1.pdf 

This article provides the solution of problems describing the work of small engines in the punching equipment, in a strongly curved channel, using design techniques KNB. As a result of analyzes of punching equipment qualitatively and quantitatively demonstrated the possibility of extra-long drill perforations of small diameter and the radius of curvature of the layout with standard special propeller engines to forecast the trajectory.

Keywords: punching equipment, downhole drilling motors, bottomhole drill string assembly, punching the channel, the curvature radius of the trajectory, three-moment equation

M. Monazami, A. Hashemi, M. Shahbazian. Drilling rate of penetration prediction using artificial neural network: a case study of one of Iranian Southern oil fields // Electronic scientific journal "Oil and Gas Business". 2012. Issue 6. pp. 21-31. URL: http://www.ogbus.ru/eng/authors/MonazamiM/MonazamiM_1.pdf 

Rate of Penetration (ROP) estimation is a key parameter in drilling optimization, due to its crucial role in minimizing drilling operation costs. However, a lot numbers of unforeseen factors affect the ROP and make it a complex process and consequently difficult to predict. This paper presents an application of Artificial Neural Network (ANN) methods for estimation of ROP among drilling parameters obtained from one of Iranian southern oil fields, according to the fact that this method is useful when relationships of parameters are too complicated. The method is proposed as a more effective prognostic tool than are currently available procedures. The methodology enables drilling industry personnel to estimate the ROP not only during well planning procedure but also during drilling. A three layer feed-forward network has been selected which has the best correlation coefficient in testing the models. Simulation results show that the ANN approach is superior to the conventional methods in drilling rate prediction accuracy.

Keywords: Artificial Neural Network, Rate of Penetration, Drilling efficiency, ROP Prediction

A.M. Alimzhanov. Stress-strain state (SSS) and stability around underground spherical cavity in rock massif with the technological radial inhomogeneity of rock mechanical properties // Electronic scientific journal "Oil and Gas Business", 2012, Issue 6, pp. 32-45. http://www.ogbus.ru/authors/Alimzhanov/Alimzhanov_2.pdf 

Stress-strain state (SSS) and stability around underground spherical cavity in rock massif with the optional radial inhomogeneity in the polynomial form of rock mechanical properties were found. The concretization method of polynomial functions  by means of polynomial coefficients definition according to given distributions of mechanical properties concerned with the technological inhomogeneity around cavity was advanced. Methods of durability analysis and stability control of spherical cavity walls with taking into account given inhomogeneity of rock mechanical properties were worked. Statements of Stability Theory in Rock Mechanics elaborated by prof. M.T.Alimzhanov were used in this research.

Keywords: underground spherical cavity, rock massif, inhomogeneity of rock mechanical properties, Stress-strain state (SSS), Methods of durability analysis and stability control, stability theory, stability of spherical cavity walls

V.S. Petrov. Controlling the properties of the plugging solution – stone additions of aminomethylene phosphonic chelator // Electronic scientific journal "Oil and Gas Business", 2012, Issue 6, pp. 53-59. http://www.ogbus.ru/eng/authors/PetrovVS/PetrovVS_1e.pdf 

Achieving quality zonal isolation is the key to its long-term and safe operation. Quality of well casing depends on the physical and chemical properties of cement slurries.

The challenge of finding effective controls properties of cement slurry-stone continues to be important.

One way to control the physicochemical properties of cement slurry is the use of aminomethylene phosphonic chelating.

Keywords: oil-well solution, chelating, fluid loss, cement stone, gas permeability, retarding setting time

Yu.S. Kuznetsov, V.N. Sonin, R.Yu. Sukhorukov, V.Yu. Artamonov, S.R. Ganiev, V.N. Ignatyev, P.V. Ovchinnikov, V.V. Maslov, I.I. Makarova. Effect of salt compositions including to the plugging solution curing process. Electronic scientific journal "Oil and Gas Business", 2012, Issue 5, pp. 69-85. http://www.ogbus.ru/authors/KuznetsovYuS/KuznetsovYuS_3.pdf 

Plugging solution after pushing into the annulus stays for a long time in quasi-crystalline state. Changes in the physical and mechanical properties of hardening cement can be explained by leaving hydration products of portlandcement with the filtrate. The article presents the results of studies on the effect of salt composition on the processes of the main components of portlandcement hydration.

Keywords: plugging solution, cement, portlandcement, hydration, salt composition

L.B. Khuzina, L.V. Petrova. Techniques to reduce friction in field development by horizontal wells. Electronic scientific journal "Oil and Gas Business", 2012, Issue 5, pp. 62-68. http://www.ogbus.ru/authors/Khuzina/Khuzina_4.pdf 

One of the current problems in drilling wells with horizontal end is to reduce sticking of drill pipe, especially in the horizontal section. The methods for reducing the frictional forces that reduce the probability of stuck while drilling horizontal sections of directional wells are considered. In this paper the authors developed classification methods to reduce friction of the drill string with intermediate casing wall, allowing to choose the most appropriate method for reducing friction.

Keywords: horizontal end of directional wells, drill string, friction, chemical methods to reduce friction, mechanical methods to reduce friction, classification of methods to reduce friction

L.B. Khuzina, L.V. Petrova, A.F. Shaikhutdinova, A.A. Mukhutdinova. The design of bottom hole assembly for highly-viscous oil deposits development. Electronic scientific journal "Oil and Gas Business", 2012, Issue 5, pp. 55-61. http://www.ogbus.ru/authors/Khuzina/Khuzina_3.pdf 

In this paper developed new layout of the bottom hole assembly, consisting of PDC bits, downhole oscillator, screw downhole motor. Proposed bottom-hole of the assembly creates additional dynamic load on the bit, creates low-frequency longitudinal oscillations, reducing the coefficient of friction of the drill string and the borehole wall brings the load to the bit, which is undoubtedly important when drilling horizontal section of the well, applied in the development of viscous oil deposits.

Keywords: extra-heavy oil and natural bitumen, natural ways to develop deposits of bitumen, horizontal well, reducing the friction coefficient, low-frequency longitudinal oscillations, downhole oscillator, bottom hole assembly

Yu.S. Kuznetsov, V.N. Sonin, R.Yu. Sukhorukov, V.N. Nikiforov, V.N. Ignatyev, D.R. Sultanov. Technologies of special wells building for warehousing of the liquid waste of large-tonnage manufactures. Electronic scientific journal "Oil and Gas Business", 2012, Issue 4, pp. 52-66. http://www.ogbus.ru/authors/KuznetsovYuS/KuznetsovYuS_1.pdf 

To implement the method of the underground storage of liquid multi tonnage waste, the article describes the special wells construction technology. This technology allows for the special requirements for containment annulus of wells, required corrosion resistance of casings and provides high bottom-hole permeability during its initial opening and further operation.

Keywords: casings, plastic, special wells, underground storage, waste

A.P. Averyanov, I.I. Agadullin, V.Yu. Artamonov, V.N. Ignatyev, Yu.S. Kuznetsov, V.V. Maslov, S.M. Petrov, V.N. Polyakov, V.N. Sonin, R.Yu. Sukhorukov, D.R. Sultanov. Technology of installation of the water isolating screen in primary opening multilayer reservoir. Electronic scientific journal "Oil and Gas Business", 2012, Issue 4, pp. 41-51. http://www.ogbus.ru/authors/Averyanov/Averyanov_1.pdf 

Experience shows that the methods used to water seepage control are low efficient. In this case, regardless of the intensity of the water seepage and its geological and physical characteristics, complete isolation of layers doesn’t reach, and the reduction of its initial intensity after the isolation carrying out is less than 50% and the average is of 20-30%. The article describes the reasons for not completely isolated saturated reservoirs, describes combined technology of installation of the water isolating screens on the completion stage.

Keywords: well, water seepage, isolation, water saturated reservoir, water isolating screen, primary opening

R.R. Ishbaev, Yu.V. Zeigman. Diagnosis of impact technology of primary open reservoir and well cementing on the rocks filtration parameters of bottomhole formation zone. Electronic scientific journal "Oil and Gas Business", 2012, Issue 4, pp. 32-40. http://www.ogbus.ru/authors/Ishbaev/Ishbaev_2.pdf 

The article presents an analysis of impact of penetration into the formation of mud and cement slurry on the rocks filtration parameters. The comparative analysis of the impact of the presence of mud cake, repression to restore the permeability of the rocks during well cementing. We present a quantitative evaluation of colmatation rocks during the primary opening of the reservoir and wells cementing.

Keywords: drill mud, cement slurry, mud cake, cement slurry filtration, restoration of the rocks permeability

Li Jinyang. Experimental study and application prospect on alkali metal silicate in the process of drilling. Electronic scientific journal "Oil and Gas Business", 2012, Issue 3, pp. 81-91. http://www.ogbus.ru/authors/Jinyang/Jinyang_1.pdf  

The paper concludes the application of alkali metal silicates in drilling fluid and spacer fluid and the influence factors in the application. It also researches the effect of the silicate on reservoir permeability and on the corrosion- resistant performance of steel material. The article draws conclusions from comparing the effect of alkaline silicic acid gel and acidity silicic acid gel in sealing operation. Finnaly, it gives prospects of silicate's applying in drilling operations.

Keywords: alkali metal silicates, drilling fluid, spacer fluid, permeability, corrosion, silicic acid gel

R.R. Ishbaev, Yu.V. Zeigman. Investigation of rocks permeability models dynamics during well cementing. Electronic scientific journal "Oil and Gas Business", 2012, Issue 3, pp. 92-98. http://www.ogbus.ru/authors/Ishbaev/Ishbaev_1.pdf 

The article is devoted to the issue of rocks permeability reducing during well cementing. Experimental data about filtration of gauging liquid of cement slurry into the reservoir were obtained at different repressions. There were established rocks permeability models dynamics (Part ¹ 210537 Ceramic Filter Disc 5 microns) during well cementing, and also was quantified rocks contamination from drill fluid based on clays and polymers.

Keywords: drill mud, cement slurry, mud cake, cement slurry filtration, restoration of the rocks permeability

new publications

I.E. Ishemguzhin, V.U. Yamaliev, E.I. Ishemguzhin. Influence on the amplitude-frequency characteristic of downhole motor for decrease its vibration activity. Electronic scientific journal "Oil and Gas Business", 2012, Issue 3, pp. 74-80. http://www.ogbus.ru/authors/IshemguzhinIE/IshemguzhinIE_3.pdf 

Amplitude-frequency characteristics of engines with axial support with clearance with elastic terminators and axial support without a clearance with elastic terminators are considered. For realization of the settlement scheme the support without a clearance with elastic terminators to shaft of the face engine joins an additional mass. Comparison of amplitude-frequency characteristics shows that in the latter case the maximum amplitude of oscillatory process is less. The similar analysis can be recommended for an estimation vibration activity screw engines and submersible electric centrifugal pumps having axial support.

Keywords: amplitude-frequency characteristic, axial support with a clearance and elastic terminators, axial support without a clearance with elastic terminators, non- linear vibrations, additional mass, resistance forces

S.V. Lyubimova, L.B. Khuzina. Technical and technological solution to reduce the friction coefficient of the drill string during drilling wells with horizontal sections. Electronic scientific journal "Oil and Gas Business", 2012, Issue 2, pp. 194-203. http://www.ogbus.ru/authors/LyubimovaSV/LyubimovaSV_1.pdf 

The most cost-effective at the present stage of development of oil and gas industry is the drilling of wells with horizontal sections. One of the actual problems during the drilling of such wells is to reduce the friction of the drill columns in the borehole. This article considers currently existing methods of reducing drillstring friction against the walls of the well. The various types of lubricating components in drilling fluids in the case of chemical methods are used. The mechanical method assumes the use centralizers, calibrators, oscillators, etc within bottom hole assembly. The paper provides downhole oscillator, developed in Almetyevsk State Petroleum Institute, at department of "Oil and gas wells drilling". This oscillator allows to reduce the coefficient of friction of the drill string to borehole wall, therefore, to bring load to bit and increase the mechanical drilling speed.

Keywords: horizontal section of the well, reducing the coefficient of friction, casing, wall of the well, downhole oscillator, load, bit, mechanical drilling speed increasing

V.S. Semenyakin, M.M Ermekov, N.Z. Gizatov., R.S. Shipakin Reduction of the non-operating wells stock. Electronic scientific journal "Oil and Gas Business", 2012, Issue 1, pp. 159-177. http://www.ogbus.ru/authors/Semenyakin/Semenyakin_1.pdf 

Existing methods of drilling at application of the most perfect technics and the control of wells not always provide safe conducting works. Blowouts result from uncontrolled kicks, hence – it is incumbent on all persons directly concerned with drilling operations to understand kicks, their causes, modes and basic means of closing them.

Keywords: blowout, well killing operation, bottom hole pressure, drilling mud weight, pore pressure, breakdown pressure, induced pressure, gravity substitution

R.A. Ismakov, O.G. Mamaeva, V.G. Konesev, S.F. Vyaznikovcev, V.P. Matyushin, G.V. Konesev. Investigation of kinetic and plastering properties of drilling fluids for pipeline development and development of hydrocarbon’s fields. Electronic scientific journal "Oil and Gas Business", 2011, Issue 6, pp. 82-89. http://www.ogbus.ru/authors/Ismakov/Ismakov_2.pdf 

There are many problems concerned with the stability of bore-hole walls, tight pulls and sticking while drilling horizontal wells for drilling-in and pipeline building. This drilling problems can be caused by the kinetic and plastering properties of drilling fluids. The results of researching the influence of different agents on sedimentation of dispersed phase’s solids and polimer-argillaceous filter cakes. The size and composition of dispersed phase’s solids dependence on the plastering properties of drilling fluids by sedimentation analysis is shown in this article. The interforce of solids dependence on this properties is also shown here.

Keywords: phase, filter cake, penetrability, friction, sedimentation, analysis, fraction, differentials curves, dispersity

L.Z. Zainagalina. Field test results of the using of upper bit tool. Electronic scientific journal "Oil and Gas Business", 2011, Issue 6, pp. 76-81. http://www.ogbus.ru/authors/Zainagalina/Zainagalina_1.pdf 

Upper bit tool for improvement of quality of slime removal from vertical and horizontal wells is considered in the article. Results of field tests of the designet upper bit tool are shown. Tests proved the working abilities of the device. Drilling rate increased by 18% on the account of stable removal of grinded slime by circulating fluid. Basic dimensions of working elements have been experimentally defined.

Keywords: well, slime removal, slime grinding, upper bit tools

A.R. Yakhin Analysis of methods for estimating the effectiveness of drag bit. Electronic scientific journal "Oil and Gas Business", 2011, Issue 6, pp. 68-75. http://www.ogbus.ru/authors/Yakhin/Yakhin_1.pdf 

In article questions of methods for estimating the effectiveness of drag bit cutting structure to improve its design based on the analysis of bench model characteristics of the designed bit are considered.

Keywords: drag bit, cutting structure, PDC cutter, experimental assembly, methods

Kh.M. Islamov. Development of chemical composition based on xanthan gum and lignosulphonates for drilling mud treatment. Electronic scientific journal "Oil and Gas Business", 2011, Issue 6, pp. 61-67. http://www.ogbus.ru/authors/IslamovKhM/IslamovKhM_1.pdf 

Combining reagents Rhodopol®-23Ï and KLSP various groups it is possible to strengthen their action by chemical processing. Thereupon on the basis of the laboratory researches chemical reagents were combined, new compoundings liquids, for regulation of drill mud solutions with use of reagents were created. Efficiency of chemical processing can be reached a combination at small additives to a drill mud solution that essentially improves quality of a technological indicators of a solution, each of which particularly strengthens those or other physical and chemical and technological properties of chisel solutions. The essential effect of reduction of the expense of materials for management of filtrational and rheological indicators of a drill mud solutions is thus reached. The basic practical result is working out of new compoundings of drill mud solutions for flushing out of wells at drilling on the prospecting areas of the Near-Caspian hollow, these compoundings allows to increase speed of drilling, to lower quantity of complications, to reduce the expense of materials and chemical reagents.

Keywords: development of compoundings for drill mud solutions, chemical reagents, stabilizers, improvement of technological properties, drill mud solutions

O.E. Polyntsev. Reliability analysis of orienting tool gearboxes. Electronic scientific journal "Oil and Gas Business", 2011, Issue 6, pp. 54-60. http://www.ogbus.ru/eng/authors/Polyntsev/Polyntsev_1e.pdf 


Reliability analysis of epicyclical gearboxes has been developed using an analytical fatigue damage summation model and statistical field test data. Some specific results and conclusions have been presented. The approach shown in this work could be applied to reliability estimations during early design stages of drilling tools.

Keywords: reliability, fatigue, gearbox, drilling tools

V.N. Fedorov, A.P. Averyanov, S.A. Kotelnikov, M.A. Dyusyungaliev. Study the pore pressure drop in the cement solution. Electronic scientific journal "Oil and Gas Business", 2011, Issue 5, pp. 48-53. http://www.ogbus.ru/authors/Fedorov/Fedorov_1.pdf  

Provides laboratory testing to simulate the process of cement hydration in downhole conditions. The influence of filtration processes on the conditions of well lining formation was evaluated with the device "tester of gas migration in cement solution". As a result, studies revealed that the pore pressure drop is observed in all the investigated formulations of cement slurries used by oil companies. The intensity of pore pressure fall depends on the magnitude of water loss of cement solutions.

Keywords: well, cement slurry, cement stone, hydration, gas migration, pore pressure, lining leakage

A.D. Vadigullin, A.C. Galeev, R.N. Suleymanov. Development and testing of device for thermal influence on tubing threaded connections. Electronic scientific journal "Oil and Gas Business", 2011, Issue 5, pp. 41-47. http://www.ogbus.ru/authors/Vadigullin/Vadigullin_1.pdf  

The results of preliminary tests of design developed by authors so-called "thermal breaker" on tubing threaded connection before uncoupling for the purpose of uncoupling moment decrease are carried out in the work. The technique of tests and also thermal influence process is described in article. The mechanism of normal to thread surface tension reduction during heating is considered. It is established that the effect from heating is observed only in a certain interval of time and volume of water submitted to the breaker container.

Keywords: tubing, thermal influence, threading

I.I. Agadullin, V.Yu. Artamonov, V.N. Ignatiev, V.V. Maslov, R.Yu. Sukhorukov. Initial drilling in and formation isolation using hydrophobic mud and cement. Electronic scientific journal "Oil and Gas Business", 2011, Issue 5, pp. 37-40. http://www.ogbus.ru/authors/Agadullin/Agadullin_4.pdf  

In the article the authors describe the developed on the basis of experimental researches technology of primary producing formation exposing in oil-water zones with the shield generation and formation's isolation. The description of used by the technology drilling agent is given. This article contains the results of experiments with drilling agent on recipes developed by the authors. In this article the authors provide guidelines for preserving leak less annulus for multilayer oil-saturated and water-saturated deposits.

Keywords: borehole, reservoir, opening, hydrophobic solutions, backfill

T.A. Prigorovskaya. Statistical analysis of PDC drill bits runnings and their longevity prediction. Electronic scientific journal "Oil and Gas Business", 2011, Issue 3, pp. 57-72. http://www.ogbus.ru/eng/authors/Prigorovskaya/Prigorovskaya_1e.pdf 


Practice of drilling shows that modern drilling tools and the equipments using needs proper models of descriptive statistics for running results forecasting and optimization of initial drilling parameters. Methodological and practical questions of regression models application for drilling are probed at this article. Besides, it was analyzed the statistical data of PDC drill bits penetrations on the oil and gas fields of Ukraine and world, and probability of non-failure operation was calculated.

Keywords: PDC drill bits, rate of penetration, mechanical drilling speed, reliability, regression, statistical model, correlation

F.Z. Bulyukova. Control the density of drilling fluid as on expected lateral strain in borehole. Electronic scientific journal "Oil and Gas Business", 2011, Issue 2, pp. 68-73. http://www.ogbus.ru/authors/Bulyukova/Bulyukova_1.pdf 

There is a process of lateral strain in borehole during directional and horizontal drilling that goes to the borehole wall abnormal shift, which is one of the reasons why drilling tool seizes. Control the density of drilling fluid adjusted to elastic properties of the rock and to the angle of borehole deviation is suggested to limit borehole wall shift.

Keywords: deviated hole, asymmetric deformation of a well bore, chisel jamming, density of drilling fluid

D.Kh. Tuktarov, D.N. Korchagyn, P.N. Korchagyn, À.B. Okhotnikov. About work of the drilling mud cleaning systems. Electronic scientific journal "Oil and Gas Business", 2011, Issue 1, pp. 52-56. http://www.ogbus.ru/eng/authors/Tuktarov/Tuktarov_3e.pdf 


In article the problems revealed at application of decanting centrifuges with a chemical gain block are described. “The clarified water” contains the dissolved chemical reagents – therefore at its use for cement mixing slurry strongly gets thick and becomes unsuitable for well cementing. While utilization of effluents as a liquid phase for drilling mud preparation by a natural performance period, the negative result is received. It is established that the low density of a solid phase after a centrifuge takes place at separation of a drilling mud into water and a solid phase.

Keywords: drilling mud cleaning, coagulation and flocculation block, problems, referring to repeated use of centrifuge effluent

D.Kh. Tuktarov, P.N. Korchagyn, À.B. Okhotnikov. Optimization methods of drilling hydraulics in deep wells. Electronic scientific journal "Oil and Gas Business", 2011, Issue 1, pp. 41-46. http://www.ogbus.ru/eng/authors/Tuktarov/Tuktarov_2e.pdf 


In article ways of deep oil and gas well hydraulic program's optimization are described. Necessity of transition from traditionally used standard sizes of 127 mm drill pipes to new types of drill pipes - 139,7 mm with double shoulder connection is established. Advantages of application of such pipes are shown: decrease in total hydraulic losses inside pipes and annulus on 30-60 %, increase in durability of drill string on a pipe body on 10 %, increase in stiffness of pipes on 36 % that raises resistance to a sinusoidal and helical buckling.

Keywords: optimization of well drilling hydraulics, joints “double shoulder”, improved drillability factors

05.12.10, A.P. Gasanov, J.T. Neymatov

http://www.ogbus.ru/authors/Gasanov/Gasanov_1.pdf (in Russian)

The article is devoted to the scientific and technical problems to improve the design and improve the cutting ability of mill-reamer, used in sidetracking of oil and gas wells. In this paper we prove constructive shortcomings of existing systems, mill-reamer. On the basis of preliminary studies and exploratory development work, it was determined that the most effective method is constructive solutions for enhancing the cutting ability of mill-reamer.
The basic requirements for modern designs mill-reamer, which were included in the development of improved design.
Based on the results of the research, taking into account the new requirements, proposed a fundamentally new technical solution within the parameters of the basic design. On the basis of these decisions to develop improved versions of mill-reamer. Descriptions of new design solutions, implemented in the form of model samples in natural size.

Keywords: fraser-reamer, casing, opening windows, cutting, composite alloy, sidetracking

02.12.10, D.Kh. Tuktarov, P.N. Korchagyn, A.B. Okhotnikov, A.A. Okhotnikov

http://www.ogbus.ru/authors/Tuktarov/Tuktarov_1.pdf (in Russian)
http://www.ogbus.ru/eng/authors/Tuktarov/Tuktarov_1e.pdf (in English)

Presented article describes a new approach to designing and projecting of profiles in controlled directional wells. The article deals with a new designing method of an optimized S-shaped profile in controlled directional wells with minimal length (expansion) of the wellbore.

Keywords: designing of profiles in controlled directional wells, optimized S-shaped profile of a controlled directional well, well profile with maximal length

02.07.10, E.M. Inosaridze, Z.Z. Sharafutdinov, G.G. Ishbaev, R.Z. Sharafutdinova

http://www.ogbus.ru/authors/Inosaridze/Inosaridze_1.pdf (in Russian)

Practice of drilling wells shows that using modern drilling tools and the equipments not allows drilling high quality wells in the shale formations. In our opinion, it is related by that at a choice and application of drilling fluids are not considered distinctions in property of shale, and properties of drilling fluids choose without features of interaction of components of drilling fluids among themselves and shales.
The existing level of development of a science and technologies shows that the new approaches on management of properties of various objects are nanotechnology. The considerable part of researches in this area originates in object supramolecular chemistry and borrows its approaches.
Self-organization molecules and they clathrates in new structures are object supramolecular chemistry.
Use of theories supramolecular chemistry with reference to shale and drilling fluids allows to development new ways of management of their properties.
Will allow choosing optimum technical decisions at a stage project and buildings of objects of an oil and gas production complex
Results and conclusions:
1. Existing theory about a shale structure, processes of its hydration, differ considerable contradictions. Using of representations supramolecular chemistry for the shale description as hydrate inclusion compounds (clathrates), allows to specify its structure, the processes proceeding at its contact to water, a condition and properties depending on thermodynamic shale living conditions;
2. Efficiency of action of drilling fluids on shale increase with formation hydrate inclusion compounds (clathrates); they block internal structure of water in shale and fasten its particles;
3. Use of ions and hydrocarbonic connections is preferable to formation hydrate inclusion compounds (clathrates) in shale with effective size ~5*10-10 m, they are capable to form hydrate structures: Cubical-I, Cubical-II;
4. Establish the pattern of formation hydrates inclusion compounds (clathrates) during of hydration of shale depending on properties of shale allows optimizing composition of drilling fluids.
5. Representations supramolecular chemistry allows to optimize known and to find new ways of management behaviors of shale and to classify them for drilling purpose.

Keywords: shale, structure of shale, hydration of shale, drilling fluids, hydrate inclusion compounds (clathrates)

23.11.09, S.V. Sinev

http://www.ogbus.ru/authors/Sinev/Sinev_1.pdf (in Russian)

Drilling models change during historical development of drilling from domi-nanty physicomechanical properties of rocks, mechanisms and ways razrushe-nija breeds to degree of clearing of a face. After the decision of these problems, for today, heads ths interaction of the boring tool with a chink, as uniform mechanism is. Interaction of the tool with chink walls essentially distinguishes trade drilling from laboratory and drillings of small chinks.
Drilling process expressed by dependence of speed on loading on a bit are not connected with the beginning of co-ordinates. Drilling begins since some "starting" speed and "the starting" loading creating a tension in rocks, necessary to start breed destruction. Dependence of speed on loading has spasmodic three-stage character. In rotari drilling intervals of loadings of the second step are realised: the first and the third is not applied owing to small efficiency and high breakdown susceptibility of bits. In a turbine way - the first step, at an exit from which the turbo-drill stops ("breaks").
In intervals of loadings of intensive growth of speed of drilling (ILIGSD) the bit is rejected from a chink axis. In a turbine way the bit is in such position to a turbo-drill stop. The exit from ILIGSD is promoted "by cave-in in axis coincidence" bits with a chink.
On dependences of speed on loading and frequency of rotation of the bit, established in the beginning drilling, at escalating of the tool or excesses of speed, the drilling mode is operatively corrected. In turbine drilling, besides it, it is defined contain fluid drillings rocks and a bit condition.

Keywords: drilling model, destruction of rocks, bottomhole cleaning, starting speed and starting load, "indentation in coincidence of axes" of drill bit with and a hole, an interval of load of intensive drilling speed growth (ILIGSD), a mode of "a floating heel", the volumetric diagram of dependence of speed on loading and rotation frequency, cavernous of trunk

09.09.09, V.V. Fokin, V.N. Polyakov, V.N. Sonin, R.U. Kuznetcov

http://www.ogbus.ru/authors/Fokin/Fokin_1.pdf (in Russian)

In research paper writers suggested new methodology, technic and technology of effectiveness increase of methods of losts circulation control on the Siberia platform.

Keywords: losts circulation control, well-drilling, East Siberia, efficiency, mudding, isolation, methodology

24.02.09, V. Yamalyiev, E. Imayeva, T. Salakhov


The primary objective of the proposed method is to evaluate the current conditions of the drilling system and suggest modifying values of main drilling control parameters to optimize the efficiency of the drilling in whole, while reducing the probability of premature wear of the drill bit.
Method is realized with the drilling components (e.g., surface equipment, drillstring, drill bit, mud, etc.), as well as the formation being drilled. Drilling control parameters include both the parameters adjustable in real-time, such as hook load, RPM, or mud flow rate, as well as those that can be modified with some delay for maximal use of deep equipment resource.
We believe that the proposed methodology opens new opportunities for real-time drilling optimization that can be efficiently implemented within the scope of the existing drilling practice.

04.02.09, Irma Glinz, Lorena Berumen


This document provides an overall of the oil well drilling in PEMEX Exploracion y Produccion (PEP), it presents a diagnosis of the current situation which finally constitutes the grounds for a "model for the optimization of an oil well drilling program". This model is an application of the optimization techniques and, specifically, of the binary integer programming.

05.12.08, A.M. Alimzhanov

http://www.ogbus.ru/authors/Alimzhanov/Alimzhanov_1.pdf (in Russian)

Space axis symmetric stability of elastico-plastic equilibrium of vertical well in massif with layer of rock lowered physico-mechanical characteristics has been researched in this work. The Coulomb-Mohr condition as a durability criterion is used in this research. Statements of Stability Theory in Rock Mechanics elaborated by prof. M.T. Alimzhanov are used in this research. The next "stability parameters" of vertical well has been defined: critical radius of zone of inelastic deformations, critical density of drilling mud and critical displacement of a well contour.

27.11.08, Abouzar Mirzaei Paiaman, Bandar Duraya Al-Anazi


This paper presents new method to prevent stuck pipe or at least to decrease its probability while drilling of oil and gas wells. This method which is applicable in both vertical and deviated wells incorporates using nanoparticles in drilling mud composition to decrease mud cake thickness. So by having less mud cake thickness, probability of stuck pipe decreases. Also different mechanisms of stuck pipe in Ahwaz and Abb-Taymoor oil fields are considered and new approach is suggested to use, while drilling of most sensitive formations respect to stuck pipe in these oil fields.

13.11.08, Abouzar Mirzaei Paiaman, Saman Azadbakht, Bandar Duraya Al-Anazi


Wellbore stability is of critical importance in the success of drilling operations. One of the main goals of any drilling mission is to drill the well as cost-effective as possible. Wellbore instability can be detrimental to this goal. Therefore, wellbore stability analysis has been included in well planning stage of many companies.
Wellbore stability is a function of several factors such as inclination and azimuth, in-situ stresses, mud weight, rock strength parameters, etc. Some of these factors are controllable and some are not. Among the controllable factors are inclination, azimuth and mud weight. By changing these parameters, one can reduce stability problems significantly. Theoretically, it is possible to design the well trajectory in a way to face least stability problems.
In this paper linear elastic constitutive model along with Mohr-Coulomb failure criterion have been utilized to perform stability calculation for different inclinations and azimuths. It is shown that drilling wells parallel to minimum in-situ horizontal stress causes less stability problems. Also the effect of in-situ stress field on wellbore stability has been investigated and it has been demonstrated that in the case of high difference between the in-situ stresses, the optimum path for a well is a low inclination and an intermediate azimuth.

29.12.07, E.G. Grechin, V.P. Ovchinnikov

http://www.ogbus.ru/authors/Grechin/Grechin_2.pdf (in Russian)

Calculations of configurations of a bottom of the boring column, including the screw hydrodrill and two mobile centrators are executed. Research of their stability to change of geometrical parameters and zenith angle is done. The opportunity of an effective utilization of configurations for stabilization and low-intensity increases of zenith angle is shown.

17.12.07, N.A. Petrov, G.V. Conesev, I.N. Dawidova, M.M. Acodis

http://www.ogbus.ru/authors/PetrovNA/PetrovNA_13.pdf (in Russian)

The American nontoxic lubricant additive k-lube practically does not make foam clay solutions and does not influence their basic properties, thus effectively reduces stickiness, clay rind already at concentration 0.5-1.0%.
The reagent k-lube is compatible with flotoreagent-oxal, and at this ratio of foreign and domestic lubricant additives 1:1 a level of foaming in the field of its small (up to 1%) concentration

11.08.07, V. Yamalyiev, E. Imayeva, T. Salakhov


This paper is dedicated to the deep drilling equipment technical condition evaluation problems. A new method is based on one of directions of an artificial intellect, biological foundations of the natural intelligence and allows to project systems, capable of training and self-organizing without a master on the basis of the images acting on a neural network that enables to adapt a network for a solving problem.

26.07.07, G.G. Yagafarova, V.B. Barakhnina, E.G. Il'ina, I.R. Yagafarov


The purpose of the research is the biostability estimation of some drilling additives on basis of polyacrylamide, starch reagents and carboxymethylcellulose modification pertaining to association of microorganisms Rh. erythropolis VKM AC-1339D and Fusarium sp. no. 56. The more biostable from researched drilling additives for this microorganisms is the drilling additives on basis of polyacrylamide: sypan, DKS-extender, dk-drill. Choosing the right organic additive to the drilling water as to protect the environment we should take into consideration its experimental data of the biostability.

07.05.07, O.G. Mamaeva, O.G Konesev, S.V. Mantrova


In the given work the system "metal-filter cake" in application to well drilling is investigated on the basis of B.V.Derjaguin conception about the binomial law of friction. The appropriate method for study of antifriction properties of filter cake is offered. The influence of solid phase dispersion ability of a clay drilling fluid on its frictional properties is investigated.

13.04.07, E.G. Grechin, V.P. Ovchinnikov

http://www.ogbus.ru/authors/Grechin/Grechin_1.pdf (in Russian)

The analysis of stability of nonorientable drilling hookups with one and to two centralizers is executed. Drilling hookups with optimum geometrical parameters have the good characteristic concerning stability, but demand centralizers with the increased diameter. Ways of creation enough steady drilling hookups with more comprehensible geometrical parameters are shown.

03.01.07, N.A. Petrov, A.V. Korenyako, I.N. Davydova, S.F. Komleva

http://www.ogbus.ru/authors/PetrovNA/PetrovNA_6.pdf (in Russian)

During drilling a skilled-technological well 1557/22 of Sugmutskoe deposit in a horizontal site of well as a basis the polymer-clay drilling mud was applied, which in usual slanted wells (Noyabrsky region) was applied.
The chemical processing of the solution included these materials and reagents: bent powder RVMA, SŒS, SAIPAN, POLYCEM-D, LUBE-167. The updating of the solution consists in additional processing by polymers and lubricant additives (LUBE-167 and graphite) and also by the complex of surface-active substances SNPKh-PKD-515. Last gave to the solution the inhibiting (clay hydration) and superficial-active properties. For increase of the solution density was used the carbonate weighting agent. The antitacking additive Paipe-Lax was in stock.
The installation of the filter FSG-146 was provided in a horizontal site. Before hermetic sealing of space is higher than the filter with the help of packer PDM-146 a washing solution, which taking place in a horizontal trunk, is replaced on a weak concentrated hydrochloric acid with the additive cationic surface-active substance 0,5-1,5 % of water repellent agent IVV-1.

16.03.06, L.B. Khuzina, M.C. Gabdrakhimov

http://www.ogbus.ru/authors/Khuzina/Khuzina_2.pdf (in Russian)

The clause is devoted to the laboratory test of the dynamics of the dynamics of the drill. Some problems of determining of expedient drilling characteristics are considered in the work. There are also problems concerning the speed of the penetration of the vibratory booster chisel model into the granite and marble, depending the influence frequency. The clause is applied by the laboratory test results as diagram's and equations of the regression. It has been done the conclusion that to increase the speed of well drilling, especially the rotary it is necessary to develop, new designes of rock destructing bits with the frequency of dynamic influence ranging 145 Hertz.

21.09.05, S.V. Grekov

http://www.ogbus.ru/authors/Grekov/Grekov_2.pdf (in Russian)

This paper describes a simulator of hydraulic communication channel of MWD system as a long-distance line with distributed parameters. Impacts of different parameters of the line (line length, attenuation factor, drilling fluid density, compensator pressure, etc) are analyzed in terms of reception of the signal transmitted from well bottom by simultaneous operation of pressure sensor and drilling fluid flow sensor.

20.09.05, J.C. Cunha, B. Demirdal, P. Gui


This paper presents comments and some background on the use of risk analysis methods in the oil and gas industry. Particularly attention is given to applications developed specifically for drilling operations. A literature review emphasizing articles written specifically for risk analysis applications on oil & gas well drilling operation is presented.
Recommendations for procedures related to risk analysis methods implementation as well as an example of application and its results are presented.
A Monte Carlo simulation was run to predict a cumulative distribution function for a well drilling AFE (Authorization For Expenditure.) The simulation procedure as well as the resultant cumulative distribution function is presented.

16.09.05, S.V. Grekov

http://www.ogbus.ru/authors/Grekov/Grekov_1.pdf (in Russian)

This paper describes basic interferences affecting a signal transmission in hydraulic communication channel of MWD system. A separate study is performed for regular interferences caused by non-uniform operation of drilling pumps and random noises occurring in drilling tool operation.

01.09.05, E.A. Volgemut, S.V. Grekov

http://www.ogbus.ru/authors/Volgemut/Volgemut_1.pdf (in Russian)

This paper covers issues of reliable operation of hydraulic downhole motors combined with a MWD system with a hydraulic communication channel. Dependence between rotating speed of downhole motor shaft and hydraulic signal amplitude is calculated for different motor types. Change of hydraulic signal amplitude due to downhole pressure change is analysed considering wave parameters of hydraulic signal.

25.06.04, Z.Z. Sharafutdinov, R.Z. Sharafutdinova

http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_2.pdf (in Russian)

A significant part in solving these problems is played by reological properties of drilling muds used in well construction. Analysis of drilling mud reological properties from standpoint of classical mechanics does not call for considering discreteness of their liquids at the level of suspension and constituon of the liquid itself, and does consider the properties of inter-particle forces acting inside them. All this impedes solution of technological problems in well construction.
The paper reviews the influence of nature of water behavior in drilling mud, chemical composition and thermodynamics properties of reagents on reological properties of drilling muds. Described are the basic ways of the rheological properties control.

18.06.04, Z.Z. Sharafutdinov

http://www.ogbus.ru/authors/Sharafutdinov/Sharafutdinov_1.pdf (in Russian)

Clay is an extremely hydrophilic material. It is always saturated with water, however water quantity and state depend on thermodynamic conditions of clay existence. Depending on state of water in clay, its physical and mechanical properties vary within a wide range. It affects the features of clay behavior in case of deep occurrence.
There is an opinion that depending on the ground pressure, hydrate water can exercise properties of metals. Metallization of hydrate bonding with pressure increase occurs smoothly, and its recovery to the initial atomic condition will happen discretely, by jumping. Therefore, for example, opening-out during clay drilling, with water that acquired metal properties, can result in occurrence of absolutely new phenomena. First of all, metallization of water properties applies corrections to clay properties through pore pressure. In course of drilling, the influence of ground pressure is removed from clay; therefore bonds recovery from metallic to atomic condition takes place in water. It manifests itself in the well, as a sharp increase is slough and rockslide with lifting a big amount of cuttings in the form of needle-like, arrow-type and scaly solid particles.

21.04.04, Lyagov À.V. etc.

http://www.ogbus.ru/authors/Lyagov/Lyagov_1.pdf (in russian)

In paper tells about the first results of the experimental drilling on depression of a horizontal well at ANK "Bashneft", with the help of a coiled tubing complex produced by domestic companies. The experiments with the coiled tubing devices working at the bottom-hole assembly (BHA) on aerated fluid have demonstrated their work capacity and possibility to control the pathway during the drilling process. The performance parameters and the indispensable technological modes of exploitation of a coiled tubing complex have been experimentally selected.

25.02.04, Shokir E. M. El-M.


Drill string failure is due to a lot of reasons, which may occur either individually or in-group. In order to prevent or at least minimize occurring drill string failure, all reasons should be recognized. To do that, one should have a good designed approach to test all factors, affecting drill string failure, to early eliminate the problem. Early studied cases were analyzed without an overall approach and without revealing the actual reasons of the drill string failure.
This paper introduces a new interactive program that helps to recognize and prevent the drill string failure before and while drilling. The validity of this program is successfully approved by its application on some failure cases. Therefore, it could be successfully applied in other cases, and easier recognized if the drill string is close to fail and hence an immediate action is to be taken to improve the drilling parameters to prevent the drill string failure.

14.04.03, Mukminov I.


The problem of fluid influx to the horizontal well drained the elliptical homogeneous-anisotropic reservoir is considered. The exact analytical solution for filtration velocity is obtained.
It is shown that the filtration velocity is maximal in the "end" points of the horizontal well. In case of circular reservoir the filtration flow is close to the radial one and the lines of equal velocities are nearly concentric circles, when the length of horizontal well is small. For middle-long and long horizontal well the filtration flow can be considered as a superposition of three constituting basic filtration flows: a linear-parallel one, which flows towards the central part, and two radial flows, which flow to the endings of the horizontal well.

11.12.2001, Bela Mating, Tibor Bodi


Besides the behavior of the hydrocarbon reservoir, the drilling and completion technology has a significant influence on the production capacity of oil and gas wells. When a well is not producing as expected, the formation may have low permeability or/and may be “damaged”. If the evaluation of the well productivity during the DST (Drill Steam Test) tests and the production of other wells in the same reservoir show that the production of the examined well should be higher we can look for the reason for the low production. If the reservoir permeability is low the well is the candidate of the stimulation by hydraulic fracturing. When the restricted flow into the wellbore caused by the improper well drilling or well completion technology then the near wellbore damage should be removed or decreased, and the completion technology should be corrected. In order to increase the efficiency of well completion and select the right well stimulation method we need to recognize the reason for the low production. After recognizing the source of low production we will be able to increase the well production by selecting and applying the suitable well stimulation method and we will be able to correct our drilling and completion technology in other to increase the production of the wells that will be drilled in the future.

11.12.2001, Imre Federer


A well constructed horizontal production well can assure the most advantageous flowing conditions when the fluid content of the yield gas is not separated to a considerable extent in the environment of the bore bottom. However, in case of wells producing a high gas- fluid ratio, the intensive separation of fluid and gas in the horizontal section may cause failures of the well structure. For the time being, there is a serious uncertainty concerning hole gripping, system pressure and the effect of well structure influencing flow conditions. The clarification of effects influencing the flow conditions in a horizontal well section could be an important step in preventing the expected production problems, as well as from the point of view of the construction of a suitable well structure.
The present study reports on a series of tests for investigating the mixed flow of gas and fluid in a horizontal well section. Conditions of the design and development of the investigation equipment are presented. In the following, the analysis of horizontal well sections is proposed to be a factor to be considered in well design. During the investigation, flow diagrams have been made to analyze the impact of the casing liner - producing pipe on the flow chart.

11.12.2001, R. Ismakov, A. Popov


At the modern stage of the improvement and elaboration of new tools for drilling and repair of wells, an agreement of geometric parameters and flow process properties is necessary not only of the tool as a whole or its functional systems, but of the component parts of the functional systems with an actual distribution per them of kinematics, power and energetic characteristics of the mode of its operation. Such approach to the solution of this problem requires a statement and fulfilment of detailed researches of work relating to a wear for each system of the tool and its components. For ex, as for a rotary bit’s support its functioning and wear of bearings, sealing properties, a lubrication system operation, lubricants in specific conditions of the support’s functioning. Detailed research works, carried out at the university, allowed to underline weak parts of each system and concentrate efforts of the scientists, firstly, on the achievement of equal-strength of tool’s components, and then, on the elaboration of it at a new qualitative level.
This article is based on researches of the mechanical processes in mining rocks and rock- destruction tools, which started under the leadership of professor L.A. Shreiner and were continued at USPTU under the leadership of Prof. M.P. Mavliutov in the direction of a dynamic destruction of mining rocks when drilling and hydraulics of the zone attached to the well; Prof. A.I. Spivak in the direction of mining rocks abrasion and wear-resistance of rock-destructive tools and Prof. G.V. Konesev in the direction of tribotechnique, applying to the conditions of wells’ drilling.
At present, a complete school of researchers of these problems was formed at USPTU, and the authors of the represented article are included in this structure as well.

11.12.2001, Tibor Szabo'


The prospecting activity for CH is more than 60 years old in Hungary. During this long time we had 73 documented blowouts and more undocumented kicks. Well control was difficult and expensive here because of the abnormally high temperatures and the extreme overpressures of the formations. Among the blowouts we had 12 oil and gas, 1 steam with 180 C° surface temperature, 4 CO2 blowouts with -30 C° surface temperature. 15 rigs were destroyed, 10 craters were formed by the blowouts and, unfortunately, a thrown DC killed one toolpusher. Shallow gas blowouts are perhaps the most difficult well control problem. A shallow gas blowout on a rig can cause large financial losses. For example, a blowout resulted in the total loss of a rig in Hungary. This event created a fishing lake near to Hajdúszoboszló. Studying the previous blowouts is very important for the drillers, engineers and instructors so as to prevent any well control problems. The results, observations and conclusions help to change the practice and technology in order to avoid any risk situations during normal drilling operations. By the favorable results of the skilled, well-trained drillers, better and better tools and equipment, day by day practical experience, and the special Well Control Training School, we have had only one blowout in the last 10 years.
This paper reviews shallow gas blowouts while drilling in Hungary and discusses current industry myths about shallow gas, typical results from a shallow gas blowout that affect the kill operation, kill options, selection criteria and well killing guidelines. The objectives of this case study are to describe procedures which will reduce the risk and cost of controlling the flow if a blowout occurs and build the experiences into our training programs to prevent this accident. Conclusion of this study include the recommended well control procedures and the required well control equipment for Hajduszoboszlo field.

11.12.2001, F.Agzamov, N. Karimov, K. Akchurin


The report substantiates the expediency of employment of expanding oil well cements for well cementing. It considers the principles of preparation of cements with different binding base and expanding additives. The mechanism of sulphoaluminate and oxide expansion is shown. It studies the effect of different factors on the expansion value and kinetics. It presents the results of experimental investigation and oil well cement compositions.


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