聚合物驱油井低流压时产量计算方法  

Calculation of production at low flowing pressure for polymer flooding oil wells

作　　者：曹广胜[1] 朱磊[1] 蒋玉梅[2] 孙海欧[1] 

机构地区：[1]大庆石油学院提高油气采收率教育部重点实验室,黑龙江大庆163318 [2]大庆油田有限责任公司第四采油厂,黑龙江大庆163152

出　　处：《大庆石油学院学报》2008年第3期120-123,141-142,共4页Journal of Daqing Petroleum Institute

摘　　要：为解决以往聚合物驱油井流入动态模型在低流压条件下产量计算误差大的问题,将幂律流体渗流定律与连续性方程和状态方程相结合,建立幂律流体在多孔介质中稳定渗流的油井流入动态方程,引入修正因数,据预测点的流压与实测流压的相对位置,针对不同流压阶段,提出相应的产量计算方法,并进行应用和影响因素分析.研究表明,按该方法进行产量预测,其计算结果与实测值符合良好,平均误差小于8%;聚合物驱油井的流入动态曲线在高流压端为上凹的曲线,低流压端为上凸的曲线,IPR曲线为向左倾斜的"S"型;随着聚合物质量浓度增加,IPR曲线变陡,油井产能下降;随着含水率增加,IPR曲线跨度增大,同流压下油井产液量增加.In order to avoid the calculation error under the conditions of low-flowing pressure with the earlier inflow performance model of polymer flooding oil wells, combining the law that power-law fluids flow through porous media with continuity equation and state-equation, the inflow performance equation is established for the case that power-law fluid stably flows through porous medium. A modified coefficient is introduced, and corresponding production calculation method is put forward by the relative value of the forecasted flowing pressure and the tested flowing pressure. The verification and analysis of effect factors are studied. The results indicate that, by this method, the productivity prediction of the polymer flooding oil wells under the low-flow pressure has been solved. Its calculation value and test value are close. The inflow performance relation curve of polymer flooding oil well is bent down at high-flow pressure part and is bent up at low-flow pressure part, so the IPR curve is 'S' shape that inclines to the left. With the increasing polymer concentration, IPR curve will become a steeper one, then oil well productivity will decline. With increasing water cut, IPR curve span will increase, then oil well production will increase in the same flow pressure.

关 键 词：聚合物驱 油井流人动态 低流压 产量计算方法 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]