任广聪,马新仿,刘永,张士诚,邹雨时

• 1:中国石油大学(北京)油气资源与探测国家重点实验室
• 2:中国石油青海油田公司钻采工艺研究院

摘要(Abstract)：

为研究裂缝性基岩地层水力压裂时水力裂缝遇天然裂缝后的裂缝扩展行为，基于二维线弹性理论计算了天然裂缝打开所需条件，利用ABAQUS建立了有限元数值模型，模拟水力裂缝遇天然裂缝后的扩展规律。结果表明，天然裂缝能否打开不仅受到水平应力差和水力裂缝、天然裂缝夹角的影响，还受到基质抗拉强度和施工排量的影响。两缝夹角达到临界值后，水平应力差越小，天然裂缝越容易打开；水平应力差越大，水力裂缝越趋向于沿原方向继续扩展。水平应力差不变时，两缝夹角越小，天然裂缝越容易打开；两缝夹角越大，水力裂缝越趋向于沿原方向继续扩展。岩石基质抗拉强度越大，天然裂缝越容易打开。排量越大，缝内流体压力越大，天然裂缝越容易打开，符合体积压裂大排量造复杂缝网的理念。

关键词(KeyWords)： 裂缝扩展;水力压裂;天然裂缝;水平应力差;抗拉强度;排量

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份公司重大专项项目“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”(2016E-01)

作者(Author): 任广聪,马新仿,刘永,张士诚,邹雨时

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