页岩支撑裂缝长期导流能力测试方法及测试装置改造
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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.
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.
引文
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[6]毕文韬,卢拥军,蒙传幼,等.页岩储层导流能力影响因素新研究[J].科学技术与工程,2015,15(30):115
[7]纪国法,张公社,许冬进,等.页岩气体积压裂支撑裂缝长期导流能力研究现状与展望[J].科学技术与工程,2016,16(14):78-88.
[2]Cipolla C L,Warpinski N R,Lolon E P,et al.The relationship between fracture complexity,reservoir properties,and fracture-treatment design[C].SPE 115769,2010.
[3]邹雨时,张士诚,马新仿.页岩压裂剪切裂缝形成条件及其导流能力研究[J].科学技术与工程,2013,13(18):5152-5157.
[4]彭科翔,李少明,钟成旭,等.页岩压裂裂缝气测导流能力实验研究[J].当代化工,2016,45(11):2520-2523.
[5]朱怡晖,贾长贵,蒋廷学.多因素影响下的页岩支撑裂缝导流能力计算[J].石油天然气学报,2014,36(8):129-132.
[6]毕文韬,卢拥军,蒙传幼,等.页岩储层导流能力影响因素新研究[J].科学技术与工程,2015,15(30):115
[7]纪国法,张公社,许冬进,等.页岩气体积压裂支撑裂缝长期导流能力研究现状与展望[J].科学技术与工程,2016,16(14):78-88.