西湖凹陷低孔低渗储层压裂改造技术体系探索与实践

Exploration and application of fracturing reconstruction technique for low porosity and low permeability reservoirs in Xihu sag

针对东海西湖凹陷低孔低渗储层油气产能低的难题,开展了水力加砂压裂改造技术探索与实践,压裂改造后低孔低渗油气层产能获得了极大提升,目前已初步建立起一套海上低孔低渗压裂改造的技术体系,包括压裂选层技术、射孔-压裂-测试一体化管柱技术和压裂测试现场施工工艺技术。文中重点阐述了西湖凹陷低孔低渗储层压裂改造技术体系的主要内容,总结了该地区低孔低渗储层压裂改造实践历程,指出了目前压裂作业中急迫解决的技术难题,对于后续的低孔低渗储层压裂改造具有一定的借鉴意义。

In order to solve the problem of low oil and gas productivity of low porosity and low permea- bility reservoirs in Xihu sag in the East China Sea, we have explored the hydraulic sand fracturing meth- od to reconstruct these low porosity and low permea- bility reservoirs and the reservoir productivity has been improved greatly after reconstruction. Now, a system of techniques to reconstruct offshore low po- rosity and low permeability reservoirs by hydraulic fracturing has been set up, including selection of fracturing intervals, perforating-fracturing-testing string design and on-site fracturing tests process, etc. This paper describes the main contents of the system of fracturing reconstruction techniques for low porosity and low permeability reservoirs in Xihu sag, summarizes the practice history of low porosity and low permeability reservoirs fracturing recon- struction techniques in the area, puts forward the technical problems to be solved in the fracturing op- eration at present and provides the significant guid- ance to the low porosity and low permeability reser- voirs reconstruction in the future.