深层低渗难采油藏的注水开发

WATERFLOOD DEVELOPMENT OF DEEP SEATED LOW PERMEABLE RESERVOIR

针对中原油田文 33块沙三上油藏埋藏深、高温、高压、低渗透等地质特点和近 10余年来一直注不进、难采出、开发基本面临瘫痪状态的实际情况 ,通过开展逐层上返注水开发先导试验 ,技术上采用细分层系、加密井网、油层改造、水质改善、优化开发技术等一系列措施 ,对全油藏进行调整和治理。措施实施后 ,压裂效果显著 ,产能提高 15 8% ,注水状况明显好转 ,采油速度由 0 3 %提高到 3% ,采收率提高 8 7个百分点 ,开发水平上了等级 ,经济和社会效益十分明显。该思路与方法从根本上解决了此类油藏平面和层间的矛盾及储量水驱动用难度大的问题 。

The upper oil reserves of Sha 3 member in Wen 33 block of Zhongyuan Oilfields is a deep buried,high geotemperature,high presseure and low permeable pool.For about 10 years,it has been difficult to inject and recovery.To deal with this situation,a precursor test of upward waterflood interval by interval was made associated with the technologies of subdividing measures,shortening well spaces,improving water quality and adjust the whole exploration project of the oil pool.After the test,the effect of pressure break is evident,waterflooding is much better than before and productive capacity is increased by 1580/0,oil recovery rates is increased 10 time as that before and recovery ratio increased 8.70/0.This method has essentially solved the problem between plane and interval and the difficulty of water driving of the reserves,increased recovery ratio.