压裂用水溶性暂堵剂的研究与现场应用

The development and application of water-soluble fracturing temporary plugging agent

缝内转向压裂技术是在水力压裂过程中加入暂堵剂,在水力压裂主裂缝通道内暂时形成桥堵,产生升压效应,从而压开新的支裂缝或沟通更多微裂缝,增大油/水层泄流面积,实现油/水井的增产增注。暂堵剂是缝内转向压裂的关键技术之一,目前在用的大部分为油溶性暂堵剂,不太适用于高含水油井及注水井。本文研制出一种水溶性压裂暂堵剂WSA,对其性能进行了研究,并开展了六口井的现场应用,结果表明,水溶性暂堵剂WSA满足缝内转向压裂工艺要求,取得了良好的增产增注效果。

In-fissure divert fracturing technology, in which temporary plugging agent is added, the temporary plugging is made and the pressure increases in the main fracture, can create new branch fractures and micro fractures, increase the area of fluid-release, finaly achieve the goal of production and injection increase. Temporary plugging agent is one of the key technology for in-fissure divert fracturing, most of the plugging agent is oil-soluble, and is not suitable for the high water cut oil wells and injection wells. A kind of water-soluble fracturing temporary plugging agent was prepared in the lab, and its performance was stud- ied, application of six wells was successfully carried out, the result shows that the water-sol- uble plugging agent meet the demand of in-fissure divert fracturing technology and achieve the goal of production and injection increase.