不同受力条件下底水油藏水平井见水时间影响因素

Factors on breakthrough time of horizontal wells in reservoirs with bottom water under different force conditions

李立峰¹ 周方喜² 熊建华¹ 陈刚¹

中国石化江苏油田分公司采油一厂，江苏 扬州 225265 中国石化江苏油田分公司，江苏 扬州 225009

No.1 Oil Production Plant, Jiangsu Oilfield Company, SINOPEC, Yangzhou 225265, China Jiangsu Oilfield Company, SINOPEC, Yangzhou 225009, China

为了确定底水油藏水平井见水时间随因素的变化特征，文中通过受力分析和量纲变换，推导了表征底水脊进动力与阻力比值的表达式，利用数值模拟研究了不同受力条件下见水时间的变化特征。研究结果表明，在不同受力阶段，见水时间随影响因素变化，表现出不同的变化规律。与黏性力主导阶段相比，黏性力与重力共同作用阶段内的见水时间对影响因素变化的敏感性更强，产生的改变程度更大，如产量降低5倍，见水时间延长可达14倍，油层厚度增大5倍，见水时间延长可达70倍。此结论有助于在底水油藏水平井开发中，通过合理优化参数充分利用重力作用，以获得更长的无水采油期，改善开发效果。

In order to determine the variation of breakthrough time, the relation between driving force and resistance was derived, and reservoirs with bottom water developed by horizontal wells were researched by numerical simulation. The result shows that the breakthrough time of horizontal well exhibits different variation under different force conditions. Compared with the phase dominated by viscous force, breakthrough time is more sensitive when the gravity could not be ignored. For example, breakthrough time is prolonged 14-fold with 5-fold decrease of production rate, breakthrough time is prolonged up 70-fold with 5-fold thickness increase of reservoir. The understanding in this paper is useful in development of bottom water reservoirs. The reservoir engineering could make use of gravity action to prolong the water-free production period and improve the development of reservoirs with bottom water.

10.6056/dkyqt201506027