Construction of Oil and Gas Wells on Land and Sea

When measuring the torque dynamic constituents by a variation structure there revealed two shortcomings, greatly limiting its application: firstly, uncertainty of the measurement result under the set permanent values of a motor drive power and, secondly, cut-off of low-frequency range of the input signals as a result of the differentiating characteristics of measuring channels.

The authors propose a synthesized torque meter free of the above-mentioned drawbacks. The essence of the proposal is the synthesis of the variation structure of the torque measurement in case of the indirect method of measurement on the example of a measuring instrument to drive the drill rig with a DC electric motor. Adjusted variation structure allows eliminating differentiation property, which leads to an increase of the frequency range of the input signals up to the values of f = 0 and automatic elimination of the appearance of the uncertainty occurrence of the measurement result.

The estimation of the meter dynamic properties, which are completely determined by the time constants of low-pass filters in the measurement channels of a drive motor current and the channel angular velocity measurement. The effect of the difference ratios of the measuring channels’ inertial properties on the variance of the measurement result estimation and, consequently, on the random error value, is determined.

Some mathematical simulation modeling of the meter and the drive on the basis of Monte Carlo method, which allowed carrying out the calculation of random errors and identifying their dependence on the ratios of the measurement channels’ inertial characteristics are performed. Based on studies conducted, there determined the maximum value of torque measurement error, that allowed making a conclusion about the metrological involvement of the synthesized meter. It is shown that the proposed torque meter is suitable for all kinds of motor drives with meters-converters into electrical value.

Key words: synthesized meter; variation structure; structural scheme; low-pass filter; dispersion of measurement estimation; low-frequency white noise.

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UDC 622.242:621.313.016.33

THE DYNAMIC EQUILIBRIUM OF THE «DRILL PIPE STRING – DRIVE» SYSTEM

(р. 9)

Boris Alexeevich Perminov,

Zafar Khanhusein Yagubov,

Emin Zafar Yagubov

Ukhta State Technical University

13, Pervomaiskaya str., 169300, Ukhta, Republic of Komi, Russian Federation,

phone: 8-912-947-41-19,

e-mail: boris.perminoff2013@yandex.ru, zav_eatp@ugtu.net, еyagubov@ugtu.net

Viktor Borisovich Perminov

LLC «Gazprom transgaz»

39/2, Lenin prosp., 169300, Ukhta, Republic of Komi, Russian Federation,

e-mail: vperminov@sgp.gazprom.ru

When a drill pipe string rotation due dissipative forces effect there appear relaxation oscillations of the drill pipe string, which, under certain conditions, such as the axial load change, can cause forced oscillations of the drive engine operational mode. Thus, the drive engine power starts to change in compliance with the harmonic law at a frequency equal to the frequency of the drill pipe string’s relaxation oscillations. That drive motor operational mode is close to an emergency one and should be immediately stopped.

The mode of forced auto-oscillations of a drive engine mode is determined by the dynamic disequilibrium in the system «drill pipe string – drive» and a violation of this balance is determined by the breakdown of the stable dynamic operational mode of the system. It is shown that the stability of the «drill pipe string – drive» operational system can be provided by a definite ratio of the inertia moments of the «top» and the «bottom» of the drill pipe string, i. e. stable regime corresponds to the ratio of these moments according to the inequality I₁/I₂>0,2.

According to this conclusion, it is necessary to slack-off the «bottom» and to weigh the column the «top» of a drill pipe string to eliminate the relaxation oscillations. This ratio increases energy accumulation at the top of the drill pipe string and decrease its accumulation in the bottom part.

The dynamic equilibrium of «drill pipe string – drive» system does not depend on the type of the drive movement but is determined either by the inertia moments ratio or by the energy ratio or by power ratio.

Key words: dynamic equilibrium; dynamic stability; moment of inertia; relaxation auto-oscillations.

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UDC 622.24.051.55

WAYS TO IMPROVE EFFICIENCY OF OPERATION

OF HYDRO-MONITOR ROLLING CUTTER DRILL BITS (р. 15)

Dmitry Yurievich Serikov

Gubkin Russian State University of Oil and Gas

65, Leninsky prosp., 119991, Moscow, Russian Federation,

phone/fax: (915) 372-77-79 (Serikov D.Yu.),

e-mail: serrico@rambler.ru

The paper present the results of studies aimed at operational efficiency enhancement of jet rolling-cutter drill bits. On the basis of the washing fluid flows in a well’s bottom zone during operation of a rolling-cutter drill bit there identified some areas of «stagnant» zones predominant formation. In order to eliminate this negative phenomenon there developed some conceptual scheme of a rolling-cutter drill bit with specially oriented jet assemblies and helical equipment.

Key words: rolling-cutter drill bit; helical equipment; non-Newtonian fluid.

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UDC 622.243

BOTTOM HOLE AREA CLEANING EFFICIENCY EVALUATION AND

IMPROVEMENT’S TASKS (р. 19)

Ilya Nikolaevich Lyapin,

Sergey Dmitrievich Prokhorov

Samara State Technical University

244, Molodogvardeiskaya str., 443100, Samara, Russian Federation,

phone: +79608100059, +79871603336,

e-mail: bngssamgtu@mail.ru

This article will analyze the effectiveness of cleaning processes of the face and the bottom zone of the well. The task of improving these processes and transportation of drilling cuttings on the surface in inclined, sloping and horizontal wells. The proposed solutions that significantly reduce energy costs for cleaning wellbore drilling.

Key words: optimizing cleaning of the face and the bottom zone of the well; problems clearing directional and horizontal wells.

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UDC 621.892.21

METHODOLOGICAL GROUNDS OF DESIGNING

OF SEALED LUBRICATION SYSTEMS WITH FORCED LUBRICANT SUPPLY

(р. 23)

Sergey Alexandrovich Belokorovkin,

Ildar Duglasovich Ibatullin,

Dinara Radievna Zagidullina

Samara State Technical University

244, Molodogvardeiskaya str., 443100, Samara, Russian Federation,

e-mail: s.belokorovkin@vbm.ru

The scheme and design of a new system of lubrication of a drill bit support that ensures the supply of fresh lubricant from the oil reservoir to the friction zone and the spent grease discharge into the annulus are developed.

A general algorithm of methodology consisting of five steps necessary for designing of drill bits lubrication system with sealed supports is developed. The methodology organically includes a set of criteria, methodologies, calculation models, linking resource characteristics of drill bits supports, lubricant properties, specific features of the lubrication system design, operating conditions of the bit, the tribotechnical properties of friction pairs in the support and other factors.

Key words: rolling-cutter drill bit; oil-filled support; sealing element.

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UDC 621.791

DETERMINATION OF PROPERTIES OF HIGHLY-RIGID CERAMIC PRODUCTS

USED IN OIL AND GAS INDUSTRY (р. 28)

Oleg Viktorovich Dushko,

Vladimir Alexandrovich Perfilov,

Vladimir Viktorovich Yaroshik

Volgograd State Architecture and Civil Engineering University

1, Academicheskaya str., 400074, Volgograd, Russian Federation,

phone: 8 (8442) 96-99-73,

e-mail: asvar05@mail.ru

Dmitry Yurievich Zemlyanushnov

National Research Moscow State Civil Engineering University

26, Yaroslavskoe shosse, 129337, Moscow, Russian Federation,

phone: 8 (499) 183-32-29,

e-mail: zemlyanushnov@inbox.ru

Use of modern ceramic materials in oil and gas industry is restrained by the absence of scientifically based technologies of their mechanical treatment. The work presents the data of pilot studies of the tool power impact on the surface of the products from highly rigid ceramics used in friction knots details of sealing rings, face consolidations of pumps and also in sliding bearings.

Key words: highly rigid ceramics; vertical force of cutting; unbalance of a grinding wheel; friction knots details.

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UDC 622.276.4

CHOICE OF THE TECHNIQUE FOR WELL PRODUCTIVITY RESTORATION (р. 32)

Sergey Alexandrovich Ryabokon,

Vera Ivanovna Badovskaya

LLC «Neftegazburservis»

3, Shosse Neftyanikov str., 350020, Krasnodar, Russian Federation,

phone: +78612243643,

e-mail: ngbs@mail.ru

The paper discusses the problems of technological liquids impact on reservoir properties during wells completion and repair. Major factors determining liquids negative impact on wells productivity are described. On the basis of the researches conducted there determined the choice of major technological measures aimed at restoring of wells productivity.

Key words: pollution area; productivity factor; perforation density; well bottom zone treatment.

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UDC 622.245.549

PROCESS FLUID COMPOSITION USED FOR DECOLMATATION (р. 38)

Evgeny Anatolievich Rogov

LLC «Gazprom VNIIgaz»

Razvilka poselok, 142717, Moscow region, Leninsky district, Russian Federation,

e-mail: E_Rogov@vniigaz.gazprom.ru

The paper presents the comparative results of laboratory studies on the effects of technological liquids compositions in order to de-colmatate a well bottom zone of a formation of terrigenous reservoirs and to increase wells productivity. To select an effective technological liquid composition there proposed some method and the device for its implementation, which allows providing simple implementation of operations and the comparability of the testing results of various compositions.

Key words: de-colmatation; well bottom zone of a formation; technological fluids.

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UDC 622.276

DEFINITIONS OF POWER PARAMETERS DURING FISHING OPERATIONS

IN PRODUCTION WELLS (р. 41)

Tulparkhan Sharabuddinovich Salavatov

Azerbaidjan State University of Oil and Industry

e-mail: petrotech@asoiu.az

Yusuf Abulfaz Ibragimov

«Azneft» Production Department, SOCAR

The paper discusses the main causes of accidents during current repair and overhaul of wells as well as the most typical kinds of accidents in production wells. The paper as well presents information that illustrates the optimal tensile load when using tools with a spot-wedge gripping mechanism to provide a reliable clutch of plates with the pipe body surface followed by its successful unscrewing, the coefficient, characterizing the ratio of the ultimate joint stress and tensile load to release the free inner tubing string head from catching, the allowable tension when reciprocating of the stuck drill pipes and tubing, the definition of the allowable safe rounds per minute of a drill pipe string by the formula and special chart in case of difficult operations (fishing, milling, etc.). The information about the classification of drill pipes and locks according to their wear-out, which affects the values when determining the power parameters in complicated operational conditions in a well is submitted as well.

Key words: accidents in wells; pipe sticking; fishing operations; reciprocating; allowable tension; number of rounds per minute when unscrewing; drill pipes wear-out.

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VLADIMUR IVANOVICH DEMICHOV CELEBRATES HIS 80^TH BIRTHDAY

(p. 53)

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JSC "ALL-RUSSIAN SCIENTIFIC-RESEARCH INSTITUTE OF ORGANIZATION, MANAGEMENT AND ECONOMICS OF OIL AND GAS INDUSTRY"

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