页岩I型断裂韧性的分形计算方法与应用

doi:10.16285/j.rsm.2018.0390

岩土力学 ›› 2019, Vol. 40 ›› Issue (5): 1925-1931.doi: 10.16285/j.rsm.2018.0390

页岩I型断裂韧性的分形计算方法与应用

纪国法^{1, 2}，李奎东³，张公社^{1, 2}，李少明³，张蕾³，刘炜³

1. 长江大学?油气资源与勘探技术教育部重点实验室，湖北武汉 430100；2. 长江大学?非常规油气湖北省协同创新中心，湖北武汉 430100； 3. 中石化江汉油田分公司石油工程技术研究院，湖北武汉 430035

收稿日期:2018-03-18 出版日期:2019-05-11 发布日期:2019-06-02
作者简介:纪国法，男，1985年生，博士，教师，主要从事非常规油气储层改造、水合物开采与防治、采油采气等方面的教学与科研工作。
基金资助:
国家自然科学基金（No. 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（No. K2018-09）；湖北省教育厅科学研究计划资助项目（No. Q20181313）；长江大学青年科研支持计划长江青年基金（No. 2016cqn045）

Fractal calculation method of model I fracture toughness of shale rock and its application

JI Guo-fa^{1, 2}, LI Kui-dong³, ZHANG Gong-she^{1, 2}, LI Shao-ming³, ZHANG Lei³, LIU Wei³

1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China; 2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China; 3. Petroleum Engineering Technology Research Institute of Jianghan Oilfield Branch of SINPEC, Wuhan, Hubei 430035, China

Received:2018-03-18 Online:2019-05-11 Published:2019-06-02
Supported by:
This work was supported by the National Natural Science Foundation of China (51804042), the Open Fund of Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University (K2018-09), the Scientific Research Plan Launched by Hubei Provincial Department of Education (Q20181313) and the Young Scientific Researchers in Yangtze University (2016cqn045).

摘要/Abstract

摘要： 水平井分段体积压裂是页岩气商业规模开发的重要工艺措施，如何评价页岩储层可压性是该工艺成功的关键。页岩断裂韧性是可压性评价的重要支撑参数，从I型断裂裂纹（裂缝）微观形态入手，结合断裂力学理论和分形理论，建立了页岩I型断裂韧性分形计算方法；借助晶体劈裂功法计算页岩表面能，采用密度、声波时差2种参数获取计算结果，对比分析新的分形方法计算数据、传统方法预测数据与试验测试数据，新的分形方法计算平均误差为3.63%，传统预测方法平均误差为 %，验证了方法的准确性；参考实例水平井测井解释数据，计算了水平段I型断裂韧性指数的全井筒连续性剖面，结合可压性级别与较大储层改造体积概率关系，优选可压性级别为III级及II级改造。建立的页岩I型断裂韧性分形计算方法对定量评价页岩储层可压性具有重要意义。

关键词: 页岩, I型断裂, 断裂韧性, 分形, 断裂韧性指数

Abstract: Shale gas development in commercial scale benefits from the key technology— staged fracturing of horizontal wells, and the evaluation of shale fracability is also the key for the technology. Shale fracture toughness is an important factor for the evaluation of fracability. Based on the microstructure of Model I fracture, combining the fracture mechanics with the fractal theory, this paper established a new calculation method of shale fracture toughness. The surface energy of shale can be calculated by means of crystal splitting, and the calculation results can be obtained easily via rock density and acoustic time. This paper presents a comparison between the fractal calculation results and the experimental test results and traditional predicting results. The comparison shows that the mean error of fractal calculation is 3.63% and the mean error of traditional predicting is ?10.53%, validating the accuracy of the new method. Referring to the horizontal well logging data of horizontal wells, this method can be used to establish the wellbore model-I fracture toughness index continuity. Considering the relationship between the fracability level and the probability of stimulated reservoir volume, the class III and class II fracability level is preferred. The fractal calculation method of model I fracture toughness of shale is important in the perspective of quantitative evaluation of shale gas reservoir fracability.

Key words: shale rock, model I crack, fracture toughness, fractal, fracture toughness index

中图分类号:

TU 452

纪国法, 李奎东, 张公社, 李少明, 张蕾, 刘炜, . 页岩I型断裂韧性的分形计算方法与应用[J]. 岩土力学, 2019, 40(5): 1925-1931.

JI Guo-fa, LI Kui-dong, ZHANG Gong-she, LI Shao-ming, ZHANG Lei, LIU Wei, . Fractal calculation method of model I fracture toughness of shale rock and its application[J]. Rock and Soil Mechanics, 2019, 40(5): 1925-1931.

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页岩I型断裂韧性的分形计算方法与应用

Fractal calculation method of model I fracture toughness of shale rock and its application

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