多层砂岩油藏分注效果评价方法及应用

Evaluation Method and Application of the Effect of Separate Layer Water Injection for Multi-layer Sandstone Reservoirs

多层状砂岩油藏采用分层注水能够有效提高开发效果,通过国内多个油田分层注水开发现状,总结了分注效果评价的主要内容和主要评价指标。其中分注效果的评价内容包括:分注合格率是否有提高;吸水剖面是否得到改善;含水上升速度是否减缓;注水结构是否得到了改善,注水利用率是否提高;产量递减速度是否减慢;水驱动用程度是否得到了提高等。分注效果的评价指标主要包括:动态开发指标评价、水驱指标评价、监测指标评价和经济指标评价等。最后以华北油田同口地区Y63断块为实例,对分注效果进行了评价,结果表明实施分注后水驱开发效果明显提高。

The exploitation effect can be improved effectively by separate layer water injection for multi-layer sandstone reservoir.We have been summarized the main contents and the main indexes of the effect evaluation on separate layer water injection,through the present development situation of separate layer water injection in domestic multiple oil fields.The evaluation contents of separate layer water injection effect include:whether the qualification rate of separate layer water injection is increased,whether the water injection profile is improved,whether the rate of water cut increase is decelerated,whether the injection structure can be improved,whether the effectiveness of water injection is increased,whether the production decline is slow,whether the degree of water-flooding can be increased and so on.The evaluation indexes of separate layer water injection effect include:the index of the dynamic development,the index of water-flooding,the index of monitoring,the economic index and so on.At last,we take the Fault Block Y63 of Tongkou Area in Huabei Oilfield for example,we evaluated the separate layer water injection effect,and the result indicated that the exploitation effect of water-flooding was improved obviously after separate injection.