煤层脉动式酸化压裂增透技术及其应用

doi:10.16265/j.cnki.issn 1003-3033.2020.10.011

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (10): 75-81.doi: 10.16265/j.cnki.issn 1003-3033.2020.10.011

煤层脉动式酸化压裂增透技术及其应用

贾男^1,2,3 助理研究员

1 辽宁工程技术大学安全科学与工程学院,辽宁阜新 12300;
2 煤矿安全技术国家重点试验室,辽宁抚顺 113122;
3 煤科集团沈阳研究院有限公司,辽宁抚顺 113122

收稿日期:2020-07-20 修回日期:2020-09-12 出版日期:2020-10-28
作者简介:贾男 (1989—),男,辽宁沈阳人,博士研究生,助理研究员,研究方向为煤矿安全、矿井瓦斯治理等。E-mail:814511388@qq.com。
基金资助:
重大专项资助项目(2016ZX05045004-001);煤科集团沈阳研究院有限公司创新引导项目(SYYD-20WS-005)。

Research and application of pulsating acid fracturing technology in coal seam

JIA Nan^1,2,3

1 College of Safety Science and Engineering Liaoning Technology University, Fuxin Liaoning 123000, China;
2 State Key Laboratory of Coal Mine Safety Technology, Fushun Liaoning 113122, China;
3 Shenyang Research Institute, China Coal Technology & Engineering Group, Fushun Liaoning 113122, China

Received:2020-07-20 Revised:2020-09-12 Published:2020-10-28

摘要/Abstract

摘要： 为解决富含矿物质煤层透气性问题,基于煤层水压致裂理论和酸液溶蚀煤体矿物质的增透机制,提出脉动式酸化压裂增透技术,采用实验室渗透率测试方法,确定适合中能煤矿的酸液配比并开展现场试验。研究结果表明:采用脉动式酸化压裂后,压裂孔抽采瓦斯平均混合流量和体积分数为普通抽采钻孔的3.10和3.39倍,为脉动式水力压裂钻孔的1.23和1.28倍,为普通水力压裂钻孔的2.02和2.04倍;脉动式酸化压裂可融合脉动应力波致裂煤体的物理增透和酸液溶蚀煤体的化学增透,提高裂隙-孔隙空间结构的发育,增加煤体中瓦斯扩散、渗流通道,酸化反应生成的二氧化碳对瓦斯有驱替作用,利于瓦斯的高效持续抽采。

关键词: 脉动式酸化压裂, 增透技术, 渗透率测试, 酸液配比, 脉动应力波

Abstract: In order to solve permeability problem of coal seams with rich minerals, based on hydraulic fracturing theory and mechanism of permeability enhancement by acid solution dissolving coal minerals, pulsating acid fracturing technology was proposed. Then, acid liquid ratio suitable for Zhongneng coal mine was determined by laboratory permeability test method, and field experiment was carried out. The results show that average mixed flow rate and volume fraction of gas extracted from fracturing hole are 3.10 times and 3.39 times of that of ordinary drainage hole, 1.23 times and 1.28 times of that of pulsating hydraulic fracturing hole, and 2.02 times and 2.04 times of that of ordinary hydraulic fracturing hole. By integrating physical enhancement of fractured coal caused by pulse stress wave and chemical enhancement of acid solution coal, pulsating acid fracturing improves development of fracture-pore space structure, and increases gas diffusion and seepage channel in coal. Meanwhile, carbon dioxide generated by acidifying reaction has a displacement effect on gas, which is conducive to efficient and continuous gas extraction.

Key words: pulsating acid fracturing, permeability enhancement technology, permeability test, acid liquid ratio, pulsating stress wave

中图分类号:

X936

贾男. 煤层脉动式酸化压裂增透技术及其应用[J]. 中国安全科学学报, 2020, 30(10): 75-81.

JIA Nan. Research and application of pulsating acid fracturing technology in coal seam[J]. China Safety Science Journal, 2020, 30(10): 75-81.

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煤层脉动式酸化压裂增透技术及其应用

Research and application of pulsating acid fracturing technology in coal seam

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