摘要
为研究页岩储层压裂后所形成裂缝的导流能力变化规律,对两种类型(剪切自支撑型、单层支撑型)页岩压裂裂缝导流能力进行测试,并对比分析了二者差异,结果表明:①研究区储层裂缝滑移量在4 mm以内,随着滑移量的增大,自支撑裂缝的导流能力逐渐增大;②自支撑裂缝与单层支撑裂缝导流能力数值上在同一个数量级,高闭合应力下,自支撑裂缝仍可为产能做出一定贡献;③剪切自支撑、单层支撑型裂缝导流能力和压力的关系均与Walsh理论存在着一定的偏差,该偏差反映了自支撑点破碎、支撑剂嵌入和破碎等的影响,且剪切自支撑的变化相对较小。研究结果对于页岩气压裂工艺优选、参数优化以及页岩气产能的预测方面具有一定理论指导意义。
In order to study the change law of fracture conductivity in shale reservoir after fracturing,two types of fracture(self-supported fracture and propped fracture)flow conductivity test were carried out,and the experimental results show these as follows.①The amount of fracture slip is less than 4 mm in research area,as the slip increases,the conductivity of self-supported fracture increases gradually.②The numerical value of the conductivity of two types of fracture are in the same order of magnitude,self-supported fracture can make some contributions for productivity even under high closure stress.③There is certain deviation in the change law of fracture conductivity and Walsh theory,which reflect the proppant embedment and the crushing of asperities,the deviation of self-supported fracture was comparatively lesser.This study result is favorable to theoretically and practically direct the optimum design of hydraulic fracturing and predict productivity.
作者
曹海涛
詹国卫
赵勇
余小群
CAO Hai-tao;ZHAN Guo-wei;ZHAO Yong;YU Xiao-qun(Postdoctoral Research Station of Sinopec Southwest Oil and Gas Branch,Chengdu 610041,China;Postdoctoral Research Station of Southwest Petroleum University,Chengdu 610500,China;Exploration and Production Research Institute,SINOPEC Southwest Oil&Gas Company,Chengdu 610041,China)
出处
《科学技术与工程》
北大核心
2019年第33期164-169,共6页
Science Technology and Engineering
基金
十三五国家科技重大专项(2017ZX05036003-006)
中石化科技攻关项目(P18058)资助
关键词
页岩气
自支撑裂缝
单层支撑缝
导流能力
滑移量
shale gas
self-supported fracture
propped fracture
conductivity
slippage
