ISSN 0130-3872 Scientific-technical journal OF OIL AND GAS WELLS ON LAND AND SEA published since 1993 June 2018 ¹ 6 12 issues per year
CONTENÒS |
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DRILLING TECHNIQUE AND TECHNOLOGY |
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Perminov B.A., Perminov V.B., Yagubov Z.Kh., Rozanov A.S. Mathematical modeling of variational structure of a torque moment measurement (p. 11‑13) |
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Perminov B.A., Perminov V.B., Yagubov Z.Kh., Kanev P.P. Analysis of a dual input control system of rotation moment (p. 19‑26) |
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WELL COMPLETION |
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FIELDS DEVELOPMENT |
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NEW TECHNOLOGIES |
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Information on the articles |
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UDC 622.24.051 DOI: 10.30713/0130-3872-2018-6-5-10
ON THE PROBLEM OF
STABILITY OF ROTATION OF THE DRILL STRING
Nikolai Denisovich Tskhadaya, Valery Konstantinovich Khegay
Ukhta State Technical University 13, Ðervomayskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: khegaivk@gmail.com
The paper deals with the problems of stability of rotation of a nonuniform drill string during deep well drilling. On the basis of the analysis of the developed mathematical model of interaction of the drill tool with a bottom hole taking into account dynamic processes proceeding in a nonuniform drill string, relations for determination of borders of steady rotation and a time stop ("spells") of the rock-crushing tool are received. This made it possible to solve the problem of identifying different zones in the field of control parameters (P0, n0) associated with the patterns of rotation of the drill tool, which, in turn, makes it possible to select the optimal mode parameters (P0, n0) taking into account the depth of the well H.
Keywords: self-oscillations; torsional low-frequency oscillations; wave processes; reflected waves; mathematical model; drill string.
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UDC 519.876.2:531.718 DOI: 10.30713/0130-3872-2018-6-11-13
MATHEMATICAL MODELING OF
VARIATIONAL STRUCTURE
Boris Alexeevich Perminov, Zafar Khanhuseyn oglu Yagubov, Andrey Sergeevich Rozanov,
Ukhta State Technical University 13, Pervomaiskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: boris.perminoff2013@yandex.ru, zav_eatp@ugtu.net, rozanov_a.s@mail.ru
Viktor Borisovich Perminov,
LLC "Gazprom transgaz Ukhta" 39/2, Lenin prosp., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: vperminov@sgp.gazprom.ru
Development of computer measuring tools requires new methods of mathematical modeling of physical values measurement channels. In this regard, the two-way structure of measurement of the drive’s torque dynamic increase during a well’s deepening is the most feasible means of measurement in the case of its representation like a mathematical model. Indeed, the representation of the dynamics of power measurement channels and angular rate of the drive shaft’s rotation like differential equations allows to transfer to their representation in the operator form. The authors consider the physical quantities correlation like equivalent stress values, thus significantly simplifying the equation of these physical values relationship. Using the equation of physical values relationship in equivalent stresses, the measurement algorithm is developed. Similarly, a step-by-step voltage algorithm (from the voltage sensor), step-by-step algorithm of current measuring (from the current sensor), an algorithm of power measurement and angular velocity of the drive shaft’s rotation are developed. Based on the functional dependence of the torque value on the power and angular rate of rotation of the drive output shaft rotation, a step-by-step development of the algorithm of measurement of the torque dynamic increase is carried out. Thus, the considered solvable model allows to implement a computer means of measurement of DC electric drive power of the drill string, the torque static value on the drive shaft and the torque dynamic increase.
Keywords: mathematical model; two structure; channel dimensions; dynamic increment; the equations of dynamics.
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UDC 622.24:005.52 DOI: 10.30713/0130-3872-2018-6-14-18
INNOVATIVE METHODS ANALYSIS OF DRILLING PROCESS CONTROL (p.14)
Boris Alexeevich Perminov, Zafar Khanhuseyn oglu Yagubov, Ilya Igorevich Vlasov
Ukhta State Technical University 13, Pervomaiskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: boris.perminoff2013@yandex.ru, zav_eatp@ugtu.net, vlasovilya623@gmail.com
Viktor Borisovich Perminov
LLC "Gazprom transgaz Ukhta" 39/2, Lenin prosp., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: vperminov@sgp.gazprom.ru
For objective assessment of the drilling technique it is aimed to increase the number of control parameters and their information data points. Expanding the volume of data allows optimizing the drilling process but increases significantly the drilling costs. The actual task is to find the drilling control parameters which would reduce the number of control points without loss of information reliability. At the same time the measured parameter should be used as the basis for an optimal drilling control system that allows not only to increase the economic efficiency of the process, but also to compensate for the drill string self-oscillation which leads to significant increase of the drilling rate. The authors suggest the torque trend as a universal control parameter which reflects objectively dynamic drilling processes. Using the torque trend as a control parameter allows making local drilling control systems with new properties. At the same time the quality of innovative drilling control systems is increased considerably due to self-oscillation compensation of the drill string in well deepening which increases the efficiency of the drill string by 20...30 %.
Keywords: control parameter; self-oscillation compensation; linear self-oscillation; torsional self-oscillation; torque trend.
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UDC 681.5.01:531.781 DOI: 10.30713/0130-3872-2018-6-19-26
ANALYSIS OF A DUAL INPUT CONTROL SYSTEM OF ROTATION MOMENT (p. 19)
Boris Alexeevich Perminov, Zafar Khanhuseyn oglu Yagubov, Pavel Petrovich Kanev
Ukhta State Technical University 13, Pervomaiskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: boris.perminoff2013@yandex.ru, zav_eatp@ugtu.net, p.kanev@mail.ru
Viktor Borisovich Perminov
LLC "Gazprom transgaz Ukhta" 39/2, Lenin prosp., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: vperminov@sgp.gazprom.ru
Along with optimization of drilling control systems there arises the need in new measurement gauges to control this technological process. As the optimization of a well drilling speed is impossible without constant tracing of a drill string dynamics during its operation, then identification of current drilling parameters increase becomes the main one to control-measurement equipment. The use of variation structures is the most effective solution of this problem. Variation structures due to their specific features allow to cut off the constant component of the measurement result and to identify the change of the measured parameter rate that allows to realize the dynamic object control (a drill string or its drive). Dynamic control allows to substantially increase the stability of a drilling technological process with its speed optimization of a well drilling and to reduce the drilling costs. Variation structure properties as a dynamic measurement instrument and its and specific features are considered. Cutting off the measured parameter constant component promotes not only effective identification of dynamic increase but also considerably reduces the measurement accuracy. Favorable ratio of aperiodic links elements time constants is defined that allows to get the maximum dynamic sensitivity. Construction of two-input control systems of a drill string drive torque on the shaft of a drill string shaft, based on variation structures is considered. This system is analyzed and recommendations on direct implementation of two-input control systems of a drill string torque control are given.
Keywords: two-input control systems; variational structure; torque; dynamic increases; measurement errors.
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UDC 622.24:005.8 DOI: 10.30713/0130-3872-2018-6-27-31
NOVASIONAL SYSTEMS OF
DRILLING CONTROL
Boris Alexeevich Perminov, Zafar Khanhuseyn oglu Yagubov, Ilya Igorevich Vlasov,
Ukhta State Technical University 13, Pervomaiskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: boris.perminoff2013@yandex.ru, zav_eatp@ugtu.net, vlasovilya623@gmail.com
Increase of a well deepening under axial stress critical values brings the stability violation of the drill string form thus leadings to a bending half-wave of its stretched part. Pressing of the half-wave crest against ta well wall under a sufficient axial load can create the drag torque (moment of resistance) quite enough to stop the drill string rotation at the point where it is pressured to the well wall. In this case the stretched part of the drill string is twisted due to the torque application, thus promoting accumulation of the drill string potential energy. When the potential energy exceeds the braking forces values there happens the drill string slippage into a rotary motion with acceleration due to the reduction of the moment of the drill string friction against the well walls when the rate of its rotation increases. Herewith, the drill string rotation rate can exceed its rotation rate at the wellhead. When the kinetic energy of rotation decreases, the drill string motion slows down and it stops. Further on, it is the column slow-down that is responsible for an emergency situation. Due to this fact, compensation of the motor power self-oscillation of the drill string drive is a very urgent problem. The authors suggest the method of relaxation oscillation compensation based on the control of the motor drive power capacity by the impact of these oscillations frequency but shifted by 180° phase. The grounds of this method possible application are considered and the practical solution for the antiphase control of the motor of the drill string drive on the example of the direct current electric motor is given.
Keywords: relaxation oscillations; drill string wobbling; induced self-oscillation; power take-off threshold; drill string drive; torque gradient; drilling control system; dissipative forces; information reliability; information processing.
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UDC 621.65-82:622.276 DOI: 10.30713/0130-3872-2018-6-32-39
ANALYSIS OF UNDERGROUND
EQUIPMENT CONSTRUCTIONS
Evgeny Sergeevich Yushin, Igor Yurievich Bykov
Ukhta State Technical University 13, Pervomayskaya str., Ukhta, 169300, Komi Republic, Russia, e-mail: EvgeniyYushin@mail.ru, ibykov@ugtu.net
The constructions of implosion pressure hydro-generators of single and multiple action are analyzed, shortcomings of technical devices are identified and ways of mechanisms updating are outlined. The results of practical application of some types of implosion hydro-generators in field conditions are presented.
Keywords: underground well equipment; implosion; pressure hydro-generator; enhancement of oil production; impact on a formation.
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UDC 622.276 DOI: 10.30713/0130-3872-2018-6-40-46
ESTIMATION OF A
FORMATION PREHEATING EFFECT
Aleksey Alekseevich Terentyev, Irina Nikolaevna Menshikova, Sergey Mihailovich Durkin, Nikolai Denisovich Tskhadaya
Ukhta State Technical University 13, Ðervomayskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: durkin@bk.ru
The article overviews the existing methods of modeling of a formation preheating and analyzes their results calculated in the CMG hydrodynamic simulator. The results are compared both with account of the preheating and without it. Taking into account the insufficiency of the information in the open literature, the relevance of this article is obvious. The results are of a test nature and will be further tested on permanently acting geological-technological models.
Keywords: formation preheating; steam circulation modeling; Heaterwell; Flexwell.
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UDC 539.371:004.455 DOI: 10.30713/0130-3872-2018-6-47-52
COMPUTER SIMULATION OF
THE STRESSED-DEFORMED STATE (SDS)
Ivan Nikolaevich Andronov, Ekaterina Vladimirovna Semitkina
Ukhta State Technical University 13, Ðervomayskaya str., Ukhta, 169300, Republic of Komi, Russian Federation, e-mail: iandronov@mail.ru, iandronov@ugtu.net
When designing a new construction, certifying an imported one or examining valves industrial safety it is necessary to conduct strength calculations to confirm its reliability. The present paper analyzes the stress-strain state of the clutches manufactured from a material with the shape memory effect (SME), exposed to internal pressure as well as determines the possible use of these clutches constructions in the industry. To account for all the necessary factors affecting valves and pipelines operation, it is necessary to use computer simulation. The results of the calculation using programs of finite-element analysis make it possible to determine the real distribution of stresses in each point of the object. The work was carried out using the “ANSYS” program complex of finite element method. The values of the stresses that occur during the crimping process were obtained. The distribution of stress fields was got both in the text and in graphical forms.
Keywords: simulation; coupling; shape memory; ANSYS; finite elements method; deformation; valves.
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