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首页 > 过刊浏览>2020年第43卷第4期 >25-32. DOI:10.11835/j.issn.1000-582X.2019.255
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基于平面应变和沿晶断裂条件下剪切滑移作用的页岩可压性评价方法
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TE377

基金项目:

国家自然科学基金资助项目（51804042）；长江大学油气资源与勘探技术教育部重点实验室开放基金资助项目（K2018-09）；国家重大科技专项资助项目（2016ZX05060004）；湖北省教育厅科学研究计划资助项目（Q20181313）；长江大学青年科研支持计划长江青年基金资助项目（2016cqn045）。


A method for evaluating shale fracability based on shear slip fractures under plane strain and intergranular fracture
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    摘要:

    水平井分段压裂可使人工裂缝与页岩发育的大量天然裂缝、层理等结构弱面相交形成复杂缝网，剪切滑移型裂缝是缝网的重要组成部分，寻求由页岩剪切滑移作用主导的可压性具有重要意义。考虑真实页岩破坏的平面应变和沿晶断裂条件，从裂纹（裂缝）微观形态入手，建立了断裂韧性计算方法；该方法的计算结果与实验测试结果对比，平均误差为2.93%；以某页岩气水平井测井数据为基础，绘制了基于断裂韧性指数进行可压性评价的全井筒连续剖面，对比压后测试结果，证实该可压性评价方法的可靠性，为页岩气高效开发提供理论参考。

    Abstract:

    Horizontal well fracturing combines the artificial fracture and a large number of structural weak surface, such as natural fracture or bedding, forming a complex network, an important section of which is shear slip fracture. Therefore, it will be of great significance to search for shale fracability. With the plane strain and intergranular fracture condition of real shale failure taken into account, and with the focus on the microscopic morphology of shear slip fracture, a method for calculating fracture toughness of shear slip fracture under plane strain was established. Compared with the experimental results, the average error of the method was 2.93%. Based on the logging data and fracture toughness index of a horizontal shale gas well, the whole wellbore continuous profile of fracability evaluation was drawn. By comparing the production after hydraulic fracturing, the reliability of this method was verified, which provided a theoretical reference for efficient development of shale gas.

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纪国法,李思辰,李奎东,李少明,刘炜,熊力坤.基于平面应变和沿晶断裂条件下剪切滑移作用的页岩可压性评价方法[J].重庆大学学报,2020,43(4):25-32.

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