苏里格气田加纤维压裂技术的应用研究

Application Research of Fiber Fracturing Technology at Sulige Gas Field

针对苏里格气田气井压裂返排过程中支撑剂回流的实际情况,制备出适合苏里格气井的压裂用纤维,并确定了加入纤维的尺寸与浓度;通过模拟裂缝强制闭合模式,结合返排过程中临界返排流量、支撑剂沉降速度等计算模型,编制了纤维防支撑剂回流压裂返排优化设计软件,并结合实际的压裂施工资料进行分析设计,为压裂液返排及控制支撑剂回流提供指导。现场的加纤维压裂和控制放喷试验表明:所研制纤维适合苏里格地区气井的防支撑剂回流要求,较为显著地减少了支撑剂回流量,提高了放喷排液速度,同时还降低了排液过程中由于支撑剂回流导致的针、闸阀损毁情况发生的概率。

To solve the problem of proppant backflow during the flowback progress in fracturing at Sulige gas field, a kind of fracturing fiber was prepared. The suitable size and adding concentration in fracturing fluid were also determined in this paper. By simulating the model of enforced crack closure and the model ofproppant sinking rate, we developed the optimiza- tion software of fibers anti-backflow of proppant, which could give useful messages for flowback of fracturing fluid and for controlling the proppant backflow. The testing results of fiber-added fracturing and controlled discharge show that the prepared fibers meet the need of anti-backflow of proppant in Sulige area. The use of fracturing fibers not only decreased the backflow but also increased rate of drain blowout; moreover, it also reduced the damage chance of needle valve and gate valve during the flowback.