Improving the Efficiency of Curved Wells’ Operation by Means of Progressive Cavity Pumps

This paper proposes a solution to the problem of improving the reliability of the operation of progressive cavity pump units in deviated and directional wells. High dogleg severity significantly contributes to rod breakage; rods often break close to the “elbows” with a dogleg severity of 2 deg/10 m or higher. Statistical analyses were used to identify the frequency of failures and their impact on the reliability of a PCP unit. The design layout and mathematical model for pump rods’ torsional vibrations in the curved section of a wellbore were developed. A simulation of the curved section was performed. This article provides the basic formulas needed to design a rotating rod string using two reduced discs. The creation of an additional crooked section resulted in multiple reductions in the “resonant” rotational speed and rigidity in the mathematical model. Determining the moment of inertia of the reduced discs’ mass made it possible to determine the sucker-rod string’s stiffness, the circular rotation frequency, and the number of sucker-rod revolutions under resonance. The number of reduced discs on the sucker-rod string depends on the curvature pattern. In summary, a centralizer for a rotating string was designed to reduce the vibration and shock effects of rods on the tubing. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Авторы
Isaev A.A. , Aliev M.M.O. , Drozdov A.N. , Gorbyleva Y.A. , Nurgalieva K.S.
Журнал
Издательство
MDPI AG
Номер выпуска
12
Язык
Английский
Статус
Опубликовано
Номер
4259
Том
15
Год
2022
Организации
  • 1 Sheshmaoil Management Company LLC, Almetyevsk, 423458, Russian Federation
  • 2 Department of Oil and Gas Equipment and Engineering Technology, Almetyevsk State Oil Institute, Almetyevsk, 423458, Russian Federation
  • 3 Department of Mineral Developing and Oil & Gas Engineering, Peoples’ Friendship University of Russia, Moscow, 117198, Russian Federation
  • 4 Department of Development and Operation of Oil and Gas Fields, Saint-Petersburg Mining University, St. Petersburg, 199106, Russian Federation
Ключевые слова
centralizer; directional wellbore profile; progressive cavity pump; reduced disc; sucker-rod string
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