X10-3水平井分段压裂优化技术研究

Optimization of multi-interval fracturing technique in horizontal well X10-3

曾凡辉1 郭建春2 陈红军 赵金洲

中国石化西南油气分公司工程技术研究院，四川 德阳 610800 西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都610500

Research Institute of Engineering Technology, Southwest Oil and Gas Company, SINOPEC, Deyang 618000, China State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

X10-3水平井具有埋藏深、笼统全相位射开井段长、原油黏度高、水平井筒与油藏最大地应力方向不完全平行的特点。压裂改造时存在吸液孔数多、裂缝扭曲复杂、多裂缝发育、压裂液滤失严重、压裂液返排及生产时原油流动困难的问题。基于裂缝形态预测、储层地质精细划分、压裂水平井裂缝参数优选、投球分段压裂和施工压力预测等技术，形成了一套适合水平井长射孔段的低成本综合优化设计方法和分段压裂技术；通过采用大排量、高黏度前置液造缝，使用粉陶打磨孔眼和降滤失，优化压裂液性能，采用低密度支撑剂等手段，保证了施工的顺利实施。测试结果表明，压裂改造形成了4批次裂缝，产液量从压前抽汲9.7 m3·d-1变为自喷产液量20 m3·d-1，获得了良好的增产效果。

Horizontal well X10-3 is with the features of deep burial，long interval perforation length, oil with highviscosity and horizontal wellbore being not parallel to the maximium principal stress orientation. During fracturing there are diffculties of large imbibition perforation，fractures distortion and complex, multiply fractures development, serious fracture fluid filtration loss and the problems of post fracturing fluid recovery backflow and oil flowing during production. Using systematic optimization procedure, coupled with the fracture morphology prediction, fine classification of reservoir geologic feature, optimal selection of fracture parameters, ball-off separate layer fracturing and construction pressure prediction etc, a set of integrated optimization design method and fracturing technology has been formed, which is suitable for long perforation section of horizontal well and with low cost. Through the application of fracturing with large discharge and high viscosity pad, it uses ceramic grinding pore and lowering filtration, optimizing fracturing fluid properties, and also using lower density proppant to ensure the construction sucessful. Test results show that 4 set of frctures  have been formed. Daily production increases from 9.7m3/d to 20m3/d and good effect on increasing production has been obtained.