安塞油田堵水转向压裂工艺设计及应用

Design and application of diversion fracturing technology for water shutoff in Ansai oilfield

安塞油田开发近40年,已进入中高含水开发阶段,综合含水63.9%。随着开发时间的延长,水淹高含水井逐步增多,目前共有1 234口,占总井数的14.5%,产能损失达30×104t/a。通过开展堵水转向压裂技术攻关,封堵原见水通道,新建油流通道,实现水淹井剩余油的有效动用,对油田的长期稳产具有重要的作用。

Ansai oilfield has been developed for nearly 40 years,in where oil reservoirs have entered into the exploitation stage with mid and high water content.Its comprehensive water content is 63.9%.With the continuous exploitation of oil reservoirs,the number of water flooded well with high water content is increasing.At present,there are 1234 water flooded wells with high water content,accounting for 14.5%of total wells.The lost productivities of these wells have reached 30×104t/a.By carrying out water shutoff and diversion fracturing technology,the original water channel is plugged and a new oil flow channel is built,which realizes the use of residual oil by water flooded wells.It plays an important role for the long-term stable production of the oilfield.