井筒压降对底水油藏水平井生产动态的影响

Impacts of wellbore pressure drop on production performance of horizontal wells in bottom-water reservoirs

王海静¹ 薛世峰¹ 仝兴华² 闫文文³

中国石油大学（华东）储运与建筑工程学院，山东 青岛 266580 山东大学（威海）机电与信息工程学院，山东 威海 264209 中国石化胜利油田分公司石油工程技术研究院，山东 东营 257000

底水油藏水平井生产动态预测是制定油藏开发方案的重要依据。文中将井筒、油藏视为耦合系统，建立了油水两相管流￣渗流耦合数学模型和有限元数值模拟方法，在此基础上开展了底水油藏水平井生产动态研究，分析了井筒压降对水平井见水时间、无水采收率及储层动用均衡性的影响。结果表明：井筒压降导致水平井跟端见水时间提前，无水采收率降低，储层动用程度均衡性变差；采液速率越高，井段越长，忽视井筒压降所引起的底水油藏水平井生产动态预测结果的误差则越大。该研究成果对水平井控水方案设计具有一定的参考价值。

Production performance is an important basis for field development project design. Regarding wellbore and reservoir as a coupling system, oil/water two-phase pipe flow-seepage coupling mathematical model and corresponding finite element numerical simulation were established. On this basis, the production performance of horizontal well in bottom-water reservoir was investigated, and the impacts of wellbore pressure drop on water breakthrough time, water-free oil recovery and uniformity of development were analyzed. The results show that wellbore pressure drop can lead to advancement of water breakthrough, low water-free oil recovery and non-uniformity of development. The higher the productivity and the longer the horizontal section is, the greater the prediction error of production performance caused by ignoring wellbore pressure drop is. The result provides a reference for water control design of horizontal well.

10.6056/dkyqt201601016