摘要
暂堵压裂是提高坪北特低渗油藏的一项重要技术,由于地质条件及油藏动态复杂多变,暂堵压裂井的效果时好时差,为了提高平均单井产量,对层间应力差进行分析,可以收到比较理想的效果。结果表明:(1)暂堵压裂井层间应力差值越大,裂缝转向后仍然在油层延伸的可能性越大,造成无效加砂的几率越小,对增产越有利。(2)层间应力差越大,暂堵剂产生的滤饼阻力越大,在暂堵剂的承压强度范围内,越有利于暂堵剂的封堵作用,从而提高缝内净压力,有助于裂缝的转向。
The temporary-blocked fracturing is a key technique contributing to the improvement of Pingbei extra-low permeable reservoir.Because the geology condition and reservoir performance are complex and changeable in Pingbei area,there is an unstable effect in temporary-blocked fractured well.Analyzing interlaminar stress difference may achieve a desirable effect in raising the average of individual-well producing rate.Practice indicates that the larger D-value is,the more possible it is for the fracture to still extend in oil rock after it changes its direction,causing less probability of invalid sand adding,more favorable to production increase,and that the bigger the interlaminar stress difference is,the bigger the cake resistance generated by temporary blocking agent is,more favorable to its plugging within pressure resistance of temporary blocking agent so as to improve net pressure within fracture,contributing to fracture＇s diversion.
出处
《江汉石油职工大学学报》
2010年第6期24-27,共4页
Journal of Jianghan Petroleum University of Staff and Workers
关键词
层间应力差
暂堵压裂
选井选层
Interlaminar Stress Difference
Temporary-blocked Fracturing
Well and Layer Selection
