有杆泵抽油系统气体膨胀能研究  

Research on the Gas Expansion Energy in Rod Pumping System

作　　者：张喜顺[1] 张祖国[1] 吴晓东[2] 胡燕[1] 汪友平[1] 

机构地区：[1]中国石化石油勘探开发研究院,北京100038 [2]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《科学技术与工程》2014年第15期39-42,共4页Science Technology and Engineering

摘　　要：目前抽油机井系统效率仿真方法只考虑地层产出气对泵效的影响,忽略了其在举升过程中释放的能量,导致高气油比井系统效率仿真结果精度偏低。针对这种现象,提出了地层中的气体在举升过程中释放的能量,包括溶解气膨胀能和自由气膨胀能两部分的理论。将有杆抽油系统输入功率划分为有效功率、气体膨胀功率、地面损失功率、地下损失功率4部分。应用能量守恒的理论,建立了自由气膨胀功率计算仿真模型,完善了以能量法为基础的系统输入功率计算模型,提高了系统效率计算仿真精度。仿真实例表明,在计算系统输入功率时,自由气膨胀功率不可忽略,其系统效率计算模型仿真精度更高。At present only the influence of output gas to the pump efficiency was considered in the simulation of system efficiency of rod-pumped well,the energy of it released was overlooked,resulting in the simulation precision of system efficiency in high-GOR wells was low. Aiming at this phenomenon,a new theory was raised that the gas of the layer released energy in the lifting process including two parts： dissolved-gas expansion energy and free-gas expansion energy. The motor＇s input power of rod pumping system was divided into hydraulic horse power,gas expansion power,surface mechanical loss power,subsurface loss power. Using the theory of energy-conserving,the simulation model of free-gas expansion power was established,the simulating models of the motor＇s input power which were based on the energy method were improved,and the simulation precision of system efficiency was enhanced. The simulation examples indicated that the free-gas expansion power can＇t be overlooked when calculating the input power,and the new simulation models of system efficiency had higher simulation precision.

关 键 词：气体膨胀功率 自由气膨胀能 系统输入功率 系统效率 能量法 

分 类 号：TE355.5[石油与天然气工程—油气田开发工程]