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Approach to the Design Calculation of Sucker Rod Pumping Systems in Coalbed Methane Wells

Chinese Journal of Mechanical Engineering 2011年第6期24卷 983-991页

作者： WANG Fudong LIU Xinfu Guan Zhichuan LIU Chunhua School of Petroleum Electronic Engineering China University of Petroleum Qingdao 266555 China Qingdao TSC Offshore Equipment Co Ltd. Qingdao 266108 China

The existing design of the pumping systems mainly focuses on the approximate computational formulae and procedures,which are developed based on the analytic approaches of conventional oil/gas *** calculation of polished rod loads usually just concerns about the static and inertial *** the computation of gearbox torque generally uses empirical formulae and correction *** above modeling procedures,if applied to the coalbed methane（CBM） wells,can not give the desired accuracy of the system design and its pertinent *** this paper,based on the kinematic and dynamic analysis of the pumping system,the kinematic relation of polished rod is analyzed,and the variation of the total loads of polished rod is developed with the limits of CBM well conditions along the *** gearbox torque calculation model is established by combining the counterbalance effect with the calculated dynamometer cards and torque *** application characteristics of this model are demonstrated by the example of ZH002-4 well in Qinshui *** interpretations of results show that the cranks of beam units should rotate in a counter clockwise direction viewed with the wellhead to the *** with oil？gas fields,the dynamic and friction to polished rod load ratios are relatively high and the computation of polished rod loads should involve the static and inertial loads,as well as vibration and friction *** the dynamic load ratio decreases rapidly during the ***,the total deformation of the string is small in CBM *** for balanced operation,the gearbox torque load usually has two approximately equal peaks and the magnitudes of instantaneous torque are just within 50% of unbalanced gearbox *** proposed research improves efficiency of the pumping system,loads the pumping unit more uniformly,and provides the reasonable basis for selecting the units.

关键词： sucker rod pump kinematic analysis polished rod load dynamometer card gearbox torque

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