摘要
常规砂岩储层加砂压裂后油气渗流通道主要依赖于支撑裂缝,而页岩气储层由于其典型的脆性特征,通过大规模体积压裂后会形成复杂的裂缝网络,页岩气渗流能力主要取决于支撑剂充填层裂缝和储层剪切滑移形成的自支撑裂缝,因此,室内页岩储层导流能力的测试应包括支撑剂充填层和自支撑裂缝的导流能力两部分。目前国内对于页岩支撑导流能力的测试方法大多还是借鉴常规支撑剂充填层导流能力测试方法,无论测试方法还是测试装备都有一定的不适应性,大部分国产支撑导流仪的闭合压力加载系统、流量控制系统不能满足页岩储层长期导流能力测试要求。文章提出了页岩支撑裂缝导流能力测试方法及支撑导流仪改进目标、改进方法、改进措施,为页岩气储层室内导流能力的实施提供了技术支撑,为页岩储层体积压裂支撑剂优选及压裂效果评价提供了保障。
The seepage channel for oil and gas after fracturing in the conventional sandstone reservoirs mainly depends on the propped fractures. Due to the typical brittle property of the shale gas reservoir,complex fracture network will be formed after large-scale volumetric fracturing,the shale gas seepage will mainly depend on both the propped fractures and the self-supported fractures formed by reservoir shearing-slipping. Shale reservoir flow conductivity test should include the conductivity test in both the propped and self supported fractures. The current domestic shale conductivity test still adopts that for conventional propped fractures. The test methods and test equipment used appear improper. The closure pressure loading system and the flow control system of most domestic flow conductivity tester can not meet the requirement of long-term flow conductivity test in shale. Shale fracture conductivity test method,and the improvement goals,improvements to be made on the flow conductivity tester are proposed in this paper,providing a technical support for shale gas reservoir conductivity test,optimal proppant selection and fracturing results evaluation.
出处
《钻采工艺》
CAS
北大核心
2018年第1期55-58,共4页
Drilling & Production Technology
基金
中国石油西南油气田分公司2017年科研项目"页岩储层压裂液作用机理及返排规律研究"(编号:20170302-03)
国家科技重大专项"大型油气田及煤层气开发"之课题4"页岩气排采工艺技术与应用"(编号:2017ZX05037-004)
关键词
页岩
自支撑裂缝
导流能力
复杂缝网
支撑导流仪
闭合压力
shale
self supported fracture
conductivity
complex fracture network
propped flow conductivity tester
closure pressure
