碳纤维连续抽油杆超冲程问题研究
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摘要
碳纤维连续抽油杆使用时,柱塞的运动存在超冲程现象,且超冲程的影响规律不明,导致碳纤维连续抽油杆的设计使用缺少理论依据。鉴于此,将抽油杆运动分解为由悬点位移和泵时变载荷激励的两个子运动,分别建立相应的数学模型,采用有限差分法对模型进行求解。根据所建模型分析了冲次和杆柱组合对柱塞超冲程的影响,分析结果表明:悬点位移激励产生的柱塞超冲程随着冲次的增加而单调增加,泵时变载荷引起的柱塞超冲程则有正有负;柱塞的超冲程是由悬点位移和泵时变载荷共同作用产生;有杆采油系统均存在超冲程现象,碳纤维-钢混合杆柱的能耗和泵效均优于全钢杆。研究结果可为现场充分利用碳纤维抽油杆的优势提供理论依据。
Carbon fiber continuous sucker rods are used in oil production systems. However,the over stroke was observed in the movement of the plunger with unknown influence,leading to lack of theoretical basis in the design and application of carbon fiber continuous sucker rods. To address the problem,the sucker rod motion is decomposed into two sub-movements excited by the suspension point displacement and the pump time-varying load.The corresponding mathematical models are respectively established and solved by the finite difference method.Based on the model,the influence of the stroke and the sucker rod string on the over stroke of the plunger is analyzed. The result shows that the over-stroke of the plunger caused by the suspension point displacement excitation increases with the stroke. However,the over-stroke of the plunger caused by the time-varying load of the pump shows positive and negative values. The over-stroke of the plunger is caused by the combination of the suspension point displacement and the pump time-varying load. Over-stroke phenomenon exists in all of the rod pumping system. The carbon fiber-steel hybrid rod string has a lower energy consumption and higher pump efficiency over all steel rod string. The study results can provide a theoretical basis for making the most of carbon fiber sucker rods.
Carbon fiber continuous sucker rods are used in oil production systems. However,the over stroke was observed in the movement of the plunger with unknown influence,leading to lack of theoretical basis in the design and application of carbon fiber continuous sucker rods. To address the problem,the sucker rod motion is decomposed into two sub-movements excited by the suspension point displacement and the pump time-varying load.The corresponding mathematical models are respectively established and solved by the finite difference method.Based on the model,the influence of the stroke and the sucker rod string on the over stroke of the plunger is analyzed. The result shows that the over-stroke of the plunger caused by the suspension point displacement excitation increases with the stroke. However,the over-stroke of the plunger caused by the time-varying load of the pump shows positive and negative values. The over-stroke of the plunger is caused by the combination of the suspension point displacement and the pump time-varying load. Over-stroke phenomenon exists in all of the rod pumping system. The carbon fiber-steel hybrid rod string has a lower energy consumption and higher pump efficiency over all steel rod string. The study results can provide a theoretical basis for making the most of carbon fiber sucker rods.
引文
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[10]XING M.Response analysis of longitudinal vibration of sucker rod string considering rod buckling[J].Advances in Engineering Software,2016,99:49-58.
[2]吴则中,田丰,张海宴,等.碳纤维复合材料连续抽油杆的特点及应用前景[J].石油机械,2002,30(2):53-56.WU Z Z,TIAN F,ZHANG H Y,et al.Characteristics and application prospect of carbon fiber composite continuous sucker rod[J].China Petroleum Machinery,2002,30(2):53-56.
[3]朱波,蔡华苏,孙乃武.碳纤维复合材料柔性连续抽油杆开发及应用[J].石油机械,2003,31(1):29-31.ZHU B,CAI H S,SUN N W,et al.Development and application of carbon fiber reinforced plastic continuous sucker rod[J].China Petroleum Machinery,2003,31(1):29-31.
[4]王志刚,乜冠祯,高军,等.碳纤维连续抽油杆在纯梁油田的应用[J].石油钻探技术,2005,33(4):58-59.WANG Z G,NIE G Z,GAO J,et al.Applications of carbon fiber coiled rod in the Chunliang block[J].Petroleum Drilling Techniques,2005,33(4):58-59.
[5]GIBBS S G.Predicting the behavior of sucker-rod pumping systems[J].Journal of Petroleum Technology,1963,15(7):769-778.
[6]DOTY D R,SCHMIDT Z.Improved model for sucker rod pumping[J].Soc.Pet.Eng.AIME,1983,23(1):33-41.
[7]余国安,邬亦炯,王国源.有杆泵抽油井的三维振动[J].石油学报,1989,10(2):76-83.YU G A,WU Y J,WANG G Y.Three dimensional vibration in a sucker rod beam pumping system[J].Acta Petrolei Sinica,1989,10(2):76-83.
[8]刘芳超,王素玲,徐广元,等.细长抽油杆柱振动特性数值研究[J].钻采工艺,2013,36(6):82-85.LIU F C,WANG S L,XU G G,et al.Numerical simulation study on vibration performance of slender rod[J].Drilling&Peoduction Technology,2013,36(6):82-85.
[9]LUAN G H,HE S L,YANG Z,et al.A prediction model for a new deep-rod pumping system[J].Journal of Petroleum Science and Engineering,2011,80(1):75-80.
[10]XING M.Response analysis of longitudinal vibration of sucker rod string considering rod buckling[J].Advances in Engineering Software,2016,99:49-58.