同井注采泵抽系统抽油杆柱纵向振动与悬点示功图仿真模型

Longitudinal Vibration Simulation Model of Sucker Rod in Injection-Production Pumping System and Polished Rod Indicator Diagram

由于同井注采泵抽系统抽油杆柱受到双泵柱塞载荷的共同作用,现有的抽油杆柱单泵力学模型不能用于同井注采双泵力学模型的研究,需要在抽油杆柱单泵力学模型的基础上进一步改进和完善。鉴于此,综合考虑柱塞的运动规律、泵筒内流体的可压缩性及泵筒内气体等因素的影响,建立了抽油泵柱塞载荷仿真模型。基于同井注采系统双柱塞载荷作用下的抽油杆柱工作原理,建立了双柱塞载荷作用下的抽油杆柱纵向振动仿真模型。仿真结果表明:仿真悬点最大载荷与实测悬点最大载荷误差仅为2.35%,验证了计算模型的正确性,而且悬点最大载荷随着气油比RGO的增大而减小,悬点最小载荷随着气油比RGO的增大而增大。

Because the sucker rod string of the same well injection-production pumping system is subjected to the joint action of double pump plunger loads,the existing mechanical model of the sucker rod string of single pump pumping system can not be used for the study of the sucker rod string of the same well injection-production pumping system,and it needs to be further improved and perfected.Therefore,considering the influences of the motion law of the plunger,the compressibility of the fluid in the pump barrel and the gas in the pump barrel,the simulation model of the plunger load of the oil well pump is established.Based on the working principle of the sucker rod string under double plunger loads in the same well injection-production system,the longitudinal vibration simulation model of the sucker rod string under double plunger loads is established.The simulation result shows that the error between the simulated maximum polished rod load and the measured maximum polished rod load is only 2.35%,which verifies the correctness of the calculation model.Moreover,the maximum polished rod load decreases with the increase of the ratio of gas to oil,and the minimum polished rod load increases with the increase of the ratio of gas to oil.