复杂断块油藏人工边水驱提高采收率机理分析

Analysis on IOR mechanism of artificial edge water flooding  in complex fault-block reservoir

张戈

Zhang Ge

中国石化胜利油田分公司现河采油厂，山东 东营 257000

Xianhe Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257000, China

人工边水驱技术是胜利油田近两年提出的一种特高含水后期提高复杂断块油藏采收率的水驱接替技术。该技术已取得了较好的现场应用效果，但提高采收率的内在机理有待深入研究。文中对与人工边水驱技术相关的已有研究成果进行了系统调研整理，对人工边水驱提高复杂断块油藏采收率的机理进行了分析。首先对人工边水驱提高采收率矿场实施现状进行了评价，在此基础上，利用室内实验、数值模拟、动态监测、理论推导等方法，开展了人工边水驱提高驱油效率和体积波及系数的内在机理分析。分析认为，人工边水驱主要通过增大过水倍数、提高驱动压力、改变流场、使分散剩余油二次富集等方法达到提高采收率的目的。最后根据研究结论对复杂断块油藏人工边水驱的内涵进行了完善。

Artificial edge water flooding is a replacing method for complex fault-block oil reservoir during high water cut period, which has been proposed by Shengli Oilfield in resent two years and used well on site. A primary analysis on IOR mechanism of artificial edge water flooding for complex fault-block oil reservoir was made. First, the implementation effect of artificial edge water flooding was evaluated. Based on this, the displacement and sweep efficiency mechanism of artificial edge water flooding was analyzed by using the methods such as indoor experiment, numerical simulation, dynamic monitoring, thoretical derivation. Analysis shows that artificial edge water flooding can enhance oil recovery by enhancing water flooding PV, increasing driving power, changing flowing field and re-accumulating remaining oil. IOR mechanism of artificial edge water flooding was expounded and the connotation was modified.

10.6056/dkyqt201404016