裂缝性储层缝网压裂技术研究及应用

Study and application on network fracturing technology in fractured reservoir

裂缝性储层压裂井生产能力主要受主裂缝沟通的天然裂缝系统控制区域的大小影响。裂缝性储层压裂改造后,短期产量来自高导流能力的主裂缝,长期产量则主要来自天然裂缝网络。常规压裂以抑制天然裂缝扩展形成主裂缝为主,其控制的渗流区域较为有限,这与压裂增产形成矛盾。因此,要提高压裂井改造效果,需要保证压裂形成的裂缝形态为网络裂缝,沟通更大的渗流区域和更远的裂缝作用距离,充分发挥主裂缝和天然裂缝网络的增产优势。在研究水力压裂裂缝网络形成条件的基础上,对缝网压裂的关键参数进行了分析研究。现场应用结果表明,缝网压裂的增产效果远远高于常规压裂。

The productivity of fractured well in fractured reservoir was affected mainly by the controlling area of natural fracture system communicated by dominant fracture.Short-term output of fractured reservoir came from dominant fracture with high conductivity after fracturing while the long-term production decided by the natural network fractures.Major principle of conventional fracturing was to get dominant fracture by restrain natural fractures;witch limited the sespage area of fluid and contrasted to the fracturing stimulation.In order to improve the effect of fractured well,complex network fractures were need after treatment to communicate bigger flow domain and reach to longer distance fracture,then both advantage of dominant fracture and natural fracture network were utilized.Besides the Network fracture forming conditions for hydraulic fracturing,the key parameters of network fracturing were analyzed in this paper.Field application shows that the yield-increased effect of network fracturing better than that of conventional treatment.