摘要
页岩气藏采用大规模、大液量加砂压裂改造后返排液的处理一直是业界备受关注的热点问题,涉及到页岩气藏开发成本与环境保护两个方面。文章就页岩气压裂返排液的回收处理技术展进行了探讨,针对钻磨桥塞以及返排期间,压裂返排液中往往含有大量压裂砂等固相颗粒,分离处理难度大等难题,优化了压裂返排液回收再利用系统,主要包括捕屑模块、除砂模块和精细化过滤模块,通过捕屑模块、除砂模块实现了返排流体的初步"清洁",进一步通过精细化过滤模块对返排液中极细固体杂质进行二次精细化连续过滤,过滤精度达到10 um级别,充分提高回收液的清洁度,使得处理后的液体可直接用作下一层或下一口井压裂基液,返排液回收利用率达到90%以上。该回收再利用系统是压裂返排液深度环保处理必不缺少的组成部分,通过进一步对蒸发技术、膜处理技术、电絮凝技术等各种环保处理技术适用性进行探讨,为国内压裂返排液环保处理技术的创新发展提供借鉴,有利于进一步解决页岩气藏开发过程中水资源瓶颈和环境保护问题。
Shale gas reservoirs are always using large scale sand fracturing treatment with large amount fluid. Treatments of fracturing flowback fluid in shale gas reservoir involving the questions of development cost and environmental protection. The recovery and treatment techniques of flowback fluid were studied. According to the problem on separateing the sand and other solid particles from the flowback fluid during drilling & milling bridge plug and fluid flowing back,the separation & recovery system for flowing back fluid which includes the bridge plug clastic trapping module,desanding module and fine filtration module was optimized to improve the cleanliness of recovery liquid,which makes the liquid can be directly used for fracturing base fluid of the next layer or a new well. The recycling rate of fracturing flowback fluid can be reached more than 90% by using this treatment system. The recycling system is indispensable part of the depth environmental protection treatment system of fracturing flowback fluid. At the same time,the environmental protection techniques including evaporation technique, membrane technology,electric flocculation technology etc. were also simply discussed,which provided a basic reference for the innovation and development of the fracturing flowback fluid environmental processing.
出处
《钻采工艺》
CAS
北大核心
2015年第3期69-72,13,共4页
Drilling & Production Technology
关键词
页岩气藏
压裂返排液
捕屑模块
除砂模块
环保处理
shale gas reservoir,fracturing flowback fluid,bridge plug clastic trapping module,desanding module,environmental protection trea
