• 非常规油气 •

### 煤岩体积压裂脆性评价研究

1. 1. 莫斯科国立罗蒙诺索夫大学地质系,俄罗斯 莫斯科 119991
2. 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
3. 陕西海荔石油机械有限公司,陕西 渭南715106
• 收稿日期:2017-02-23 出版日期:2018-02-26 发布日期:2018-12-05
• 作者简介:路艳军（1986—）,男,在读博士研究生,从事油气藏增产改造理论与工艺研究。
• 基金资助:
“十三五”国家科技重大专项“多层复杂煤体结构区煤储层直井压裂技术研究”(2016ZX05044004-002)

### Evaluation and research of brittleness on simulated reservoir volume in coal

Lu Yanjun1,Yang Zhaozhong2,Shelepov V V1,Han Jinxuan1,Li Xiaogang2,Han Wei3

1. 1. Department of Geology, Moscow Lomonosov State University, Moscow 119991, Russian Federation
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
3. Shaanxi Haili Petroleum Machinery Co., Ltd., Weinan, Shaanxi 715106, China
• Received:2017-02-23 Online:2018-02-26 Published:2018-12-05

Abstract:

The hydraulic fracturing is a major means of the coalbed methane（CBM） exploitation, and the effective channels of the methane seepage can be formed in the coal seams by this means. The stimulated reservoir volume（SRV） can not only help the coal seams form the seepage channels, but also increase the desorption-diffusion areas of the methane and improve the production of the single well by formed the complicated fractures. The brittleness index is one of the key parameters for evaluating the SRV implement, therefore, based on the stress-strain curves of the coal and shale, it is analyzed with the help of the strain-energy density. The higher the brittleness index of the shale is, the lower the strain-energy density will be. Based on the calculation method of the brittleness index of the shale, the calculation method of the coal brittleness index that combines with the strain-energy density and minimum energy principle is put forward, and the modified brittleness index of the coal is obtained, which can be used for the characterization of the coal brittle failure and evaluation of the fracture formation after fracturing. Finally, the analysis of the calculation results and data of 6 fracturing wells, indicates that the strong correlation between the coal brittleness index and stimulated volume, which means that the higher the brittleness index is, the larger the stimulated volume of unit fracturing fluid in the coal seams will be. This method can be applied to design the SRV of the coal seams and guide the exploitation of CBM.

• TE357