油水井双向堵调控水挖潜技术室内研究

大庆油田老油层进入高含水期后,通常采用堵水调剖技术来改善注水开发效果。为优化堵调控水挖潜技术方案,利用三维非均质模型分别模拟油井堵水、水井调剖和双向堵调3种控水挖潜方式,研究不同调堵顺序、堵水半径对采收率的影响。结果表明:先调后堵和先堵后调的驱油效果基本一致,但先调后堵比先堵后调见效早;同时调堵的驱油效果优于先调后堵和先堵后调;同时调堵实验结果表明封堵半径越大,封堵效果越好,当封堵距离达到井距的1/10时,再增加堵水半径驱油效果增加不明显,所以推荐最佳堵水半径为井距1/20~1/10倍。

Experimental study on potential tapping treatments with bidirectional profile control and water shutoff in oil and water wells

Profile control and water shutoff technology is used to improve the development effects of water-flooding in Daqing high water cut stage of early formations.In order to optimize the technical scheme of potential tapping treatments with profile control and water shutoff,three dimensional heterogeneous models is established to simulate the measures of water shutoff in oil wells,profile control in water wells and bidirectional water shutoff and profile control in oil & water wells.Aseries of laboratory physical simulation experiments are conducted to study the influence of water shutoff and profile control succession and block radius on the recovery.The results show that displacement effect is the essentially same with profile control first and water shutoff first,but profile control first is effective early;and the effect treated by bidirectional water shutoff and profile control is better than that of the other two measures with which the recovery rate is 2% higher than these two measures;meanwhile,the profile control experiment results show that the effect of blocking is better with the increasing of block radius,but when the plugging distance is more than 10% of well spacing,the oil displacement effect of plugging radius increase is not that obvious.So it is suggested that the best radius of water shutoff range from 1 / 20 to 1 / 10 times of well spacing.