气井水力压裂有效缝长评估及影响因素研究  

Study on Evaluation of Effective Hydraulic Fracture Length of Gas Well and Its Influencing Factors

作　　者：肖晖[1] 郭建春[1] 任山[2] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石化西南油气分公司工程技术研究院,四川德阳618000

出　　处：《现代地质》2013年第6期1434-1439,共6页Geoscience

基　　金：国家自然科学基金项目(51074138);国家科技重大专项"大型油气田及煤层气开发"(2011ZX05002);四川省青年科技创新研究团队资助计划(2011JTD0018)

摘　　要：为了准确确定气井压后有效缝长及其影响因素,提高川西须家河气藏水力压裂针对性,对于具备生产历史拟合条件的气井,利用数值模拟软件进行了生产历史拟合获得有效水力裂缝缝长,与采用净压力拟合方法获得的水力裂缝支撑缝长进行对比和拟合,获得了有效缝长和支撑缝长的关系式,计算了川西须家河储层单井压后有效缝长;采用灰色关联分析理论分析了各个参数对有效缝长的影响程度和对压裂设计的启示。结果表明:压后有效缝长与支撑缝长具有较强相关性(Le=0.0584 Lp1.359 3),有效缝长明显比支撑缝长短;施工参数(特别是用液量)是影响须家河储层有效缝长的关键,而储层和隔层间应力差则是影响有效缝长的重要客观因素。该研究方法为水力压裂压后评估和提高压裂设计水平提供了较好的借鉴。In order to accurately determine effective hydraulic fracture length and its influencing factors of gas well,to improve the pertinence of hydraulic fracturing in Xujiahe Reservoir,West Sichuan,the relationship be-tween effective length obtained from the gas wells and propped length obtained from net pressure fitting is deter-mined.The degree of the parametersinfluence on effective length is analysed by grey correlation analysis theory, and its implication to fracturing design is also analysed.Calculation results showed that there is a noticeable cor-relativity between effective length and propped length （Le =0.0584 Lp1.3593 ）,and effective length is shorter obvi-ously than propped length;construction parameters （especially fracturing fluid volume）is the primary determinant of effective length in Xujiahe Reservoir,and the stress difference between barrier and interbed is the key objective factor.This research provides a reference for post-fracturing evaluatio

关 键 词：有效缝长 致密储层 支撑缝长 灰色关联 影响因素 压后评估 

分 类 号：TE37[石油与天然气工程—油气田开发工程]