页岩气储层压裂返排一体化裂缝导流能力变化规律  

Variation law of fracture conductivity of fracturing and flowback integration in shale gas reservoir

作　　者：许冬进[1,2] 陶振强 李常兴 熊齐 李静鹏 王俊亭 曲彦颖 吴应松 XU Dongjin;TAO Zhenqiang;LI Changxing;XIONG Qi;LI Jingpeng;WANG Junting;QU Yanying;WU Yingsong(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan 430100,China;Guizhou Shale Gas Exploration and Development Co.Ltd.,Zunyi 563400,China;Hubei Institute of Aerospace Chemistry Technology,Xiangyang 441100,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]油气钻采工程湖北省重点实验室,湖北武汉430100 [3]贵州页岩气勘探开发有限责任公司,贵州遵义563400 [4]湖北航天化学技术研究所,湖北襄阳441100

出　　处：《大庆石油地质与开发》2024年第5期158-165,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“页岩气藏水平井压裂缝网流动表征及反演优化方法研究”(52004033)。

摘　　要：为研究页岩气储层压裂返排一体化过程中裂缝导流能力的变化规律,结合页岩气储层生产特点,模拟了整个压裂—返排—生产的过程,开展气测—液测—气测3个连续阶段裂缝导流能力测试实验,研究了整个过程中裂缝导流能力的变化规律。结果表明:在闭合压力为35 MPa的条件下,采用蒸馏水模拟压裂后,由于页岩水化的作用,石英砂支撑剂的导流能力降低幅度高达80.4%;在模拟返排过程中,按初始气测排量的25%、50%、75%、100%进行气测导流能力实验,裂缝导流能力逐渐升高,实验方案中其最大恢复值为初始值的65.9%;实验模拟了生产过程中由于页岩气井产量变化造成的地层压力波动对裂缝导流能力的影响。研究结果对页岩气储层压裂方案设计优化和高效开发具有一定的参考意义。In order to study the variation law of fracture conductivity in integrated fracturing-flowback process,com-bined with production characteristics of shale gas reservoirs,whole fracturing-flowback-production process is simu-lated for fracture conductivity test experiment of 3 continuous stages of gas testing-liquid testing-gas testing and study on variation law of fracture conductivity in the whole process.The results show that,at closure pressure of 35 MPa,damage range of quartz sand proppant conductivity is up to 80.4%caused by shale hydration after simulat-ed fracturing with distilled water.In the process of simulated flowback,gas testing conductivity experiment is car-ried out with 25%,50%,75%and 100%of initial gas displacement.Fracture conductivity increases continuously,with maximum recovery value of 65.9%of original value in experimental scheme.The experiment simulates the in-fluence of formation pressure fluctuation caused by shale gas well production change on fracture conductivity in pro-duction process.The research has reference significance for fracturing scheme design optimization and efficient development of shale gas reservoirs.

关 键 词：页岩气储层 水力压裂 导流能力 压裂液返排 裂缝伤害 压力波动 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]