水力压裂增透技术及应用研究

doi:10.16265/j.cnki.issn 1003-3033.2020.10.009

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (10): 63-68.doi: 10.16265/j.cnki.issn 1003-3033.2020.10.009

水力压裂增透技术及应用研究

贾进章^1,2 教授, 葛佳琪^**1,2, 甄纹浩³, 赵丹⁴

1 辽宁工程技术大学安全科学与工程研究院,辽宁阜新 123000;
2 矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛 125105;
3 阜新水务集团有限责任公司, 辽宁阜新 123000;
4 广东海洋大学寸金学院建筑工程学院,广东湛江 524000

收稿日期:2020-07-02 修回日期:2020-09-14 出版日期:2020-10-28 发布日期:2021-07-15
通讯作者: **葛佳琪(1994—),女,山西大同人,硕士研究生,主要研究方向为安全评价及瓦斯灾害防治。E-mail:1379046358@qq.com。
作者简介:贾进章 (1974—),男,河北石家庄人,博士,教授,主要从事矿井通风与瓦斯防治方面的研究。E-mail:jiajinzhang@163.com。
基金资助:
辽宁省自然科学基金资助(2019-MS-162);辽宁特聘教授项目(551710007007);辽宁省百千万人才工程项目(2019-45-15)。

Research and application of anti-reflection technology of hydraulic fracturing

JIA Jinzhang^1,2, GE Jiaqi^1,2, ZHEN Wenhao³, ZHAO Dan⁴

1 Research Institute of Safety Science and Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China;
2 Key Laboratory of Mine Power Disaster and Prevention of Ministry of Education, Huludao Liaoning 125105, China;
3 Fuxin Water Group Co., Ltd., Fuxin Liaoning 123000, China;
4 Architectural Engineering Institute, Cunjin College of Guangdong Ocean University, Zhanjiang Guangdong 524000, China

Received:2020-07-02 Revised:2020-09-14 Online:2020-10-28 Published:2021-07-15

摘要/Abstract

摘要： 为解决煤层渗透率低、瓦斯抽采率不高的问题,利用离散元软件RFPA^2D-flow进行水力压裂增透数值模拟。首先,模拟不同水压力对单孔裂缝扩展的影响;然后,模拟多点水力压裂,分析中心孔单独压裂和周边孔同步压裂对裂缝扩展发育状态的影响;最后,以马堡煤矿为工作背景,基于理论分析和研究,结合现场工业试验,综合评价水力压裂增透效果。结果表明:考虑钻孔周围地应力的重新分布能够确保数值模拟结果准确可靠;诱导应力会影响后发育裂缝的扩展方向,使后发育裂缝更易与其他裂缝形成网状结构,验证水力压裂增透机制。水压力为27 MPa时,压裂有效半径的模拟结果为2.8 m,与实测抽采钻孔的有效抽采半径3 m基本吻合。

关键词: 水力压裂, 煤层增透, 瓦斯抽采, 数值模拟, 有效半径

Abstract: In order to solve problems of low permeability and low gas extraction rate in coal seams, permeability enhancement of hydraulic fracturing was numerically simulated by using discrete element software RFPA^2D-flow. Firstly, effect of different water pressure on single-hole fracture propagation was simulated. Secondly, multi-point hydraulic fracturing was simulated, and influence of single fracturing of center hole and simultaneous fracturing of peripheral hole on development state of crack growth was analyzed. Finally, taking Mabao coal mine as working background, anti-reflection effect of hydraulic fracturing was comprehensively evaluated based on theoretical analysis and research and field industrial test. The results show that redistribution of borehole stress can ensure accuracy and reliability of numerical simulation results. Induced stress can affect propagation direction of fracture developed later, making it easier to form a network structure with that developed first, thus verifying anti-reflection mechanism of hydraulic fracturing. In addition, when water pressure is 27 MPa, simulation result of effective radius of fracturing is 2.8 m, which is basically consistent with actual radius of 3 m.

Key words: hydraulic fracturing, coal seam anti-reflection, gas drainage, numerical simulation, effective radius

中图分类号:

X936

贾进章, 葛佳琪, 甄纹浩, 赵丹. 水力压裂增透技术及应用研究[J]. 中国安全科学学报, 2020, 30(10): 63-68.

JIA Jinzhang, GE Jiaqi, ZHEN Wenhao, ZHAO Dan. Research and application of anti-reflection technology of hydraulic fracturing[J]. China Safety Science Journal, 2020, 30(10): 63-68.

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水力压裂增透技术及应用研究

Research and application of anti-reflection technology of hydraulic fracturing

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