二叠系煤岩地层煤层气井壁失稳机理及固结优化

金属矿山 ›› 2026, Vol. 55 ›› Issue (4): 59-67.

二叠系煤岩地层煤层气井壁失稳机理及固结优化

魏启明¹　胡亚军¹　杨宗泉¹　李佳文²

1. 国家能源集团宁夏煤业公司石槽村煤矿,宁夏银川 750411;2. 山东科技大学能源与矿业工程学院,山东青岛 266590

出版日期:2026-04-15 发布日期:2026-05-08
通讯作者: 李佳文(1997—),男,博士研究生。
作者简介:魏启明(1981—),男,高级工程师。
基金资助:
山东省矿山灾害预防控制重点实验室开放基金项目(编号:SMDPC202402)。

Coalbed Methane Wellbore Instability Mechanism and Consolidation Optimization in Permian Coal-rock Strata#br#

WEI Qiming¹　HU Yajun¹　YANG Zongquan¹　LI Jiawen²

1. Shicao Village Coal Mine of Ningxia Coal Industry Co. ,Ltd. ,China Energy Corporation,Yinchuan 750411,China;
2. College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China

Online:2026-04-15 Published:2026-05-08

摘要/Abstract

摘要： 针对淮南矿区二叠系煤岩地层井壁失稳这一工程难题,开展“煤岩—钻井液—固结剂”多相介质耦合失
稳机理研究,建立适用于二叠系碎软煤顶板的井壁稳定控制理论。通过XRD、SEM 及宏微观力学分析,揭示了该地层
“黏土矿物富集(伊利石占比28. 7%)、微裂隙网络发育(连通率65%)、应力敏感显著(围压梯度25 MPa/ km)”的失稳
本质;在弹性力学框架下构建“井眼—围岩—固结剂”力学模型,证实固结措施可使井壁集中应力降低6. 0 MPa(降幅
22%)、塑性区半径缩小41%。基于此,提出“低压渐进式注入+细水长流胶液投加”的工程工艺,现场应用于新谢-1L
井后,井径扩大率由28%降至9%,成功解决垮塌卡钻问题。研究成果不仅为二叠系煤岩地层井壁稳定提供了“机
理—模型—工艺”的完整理论支撑,同时为类似复杂煤系地层的钻井工程提供了可复制的技术范式。

关键词: 二叠系煤岩地层　煤层气井壁　围岩固结　钻井液封堵

Abstract: Aiming at the engineering problem of wellbore instability in Permian coal-rock strata in Huainan mining area,
the coupling instability mechanism of ′coal-rock-drilling fluid-consolidation agent′ multiphase medium is studied,and the wellbore
stability control theory suitable for Permian broken soft coal roof is established. Through XRD,SEM and macro-micro mechanical
analysis,the instability essence of ′clay mineral enrichment (illite accounted for 28. 7%),micro-fracture network development
(connectivity rate of 65%),and significant stress sensitivity (confining pressure gradient of 25 MPa/ km)′ was revealed.
The mechanical model of ′borehole-surrounding rock-consolidation agent′ is constructed under the framework of elastic
mechanics. It is confirmed that the consolidation measures can reduce the concentrated stress of the borehole wall by 6. 0 MPa
(a decrease of 22%) and the radius of the plastic zone by 41%. Based on this,an engineering process of ′low-pressure progressive
injection + fine water long-flow glue addition′ was proposed. After field application in Xinxie-1L well,the hole enlargement
rate was reduced from 28% to 9%,and the problem of collapse and sticking was successfully solved. The research results
not only provide a complete theoretical support of ′mechanism-model-process′ for wellbore stability in Permian coal-bearing
strata,but also provide a replicable technical paradigm for drilling engineering in similar complex coal-bearing strata.

Key words: permian coal-rock strata,coalbed methane wallbore,surrounding rock consolidation,drilling fluid plugging

中图分类号:

TD262

魏启明　胡亚军　杨宗泉　李佳文. 二叠系煤岩地层煤层气井壁失稳机理及固结优化[J]. 金属矿山, 2026, 55(4): 59-67.

WEI Qiming　HU Yajun　YANG Zongquan　LI Jiawen. Coalbed Methane Wellbore Instability Mechanism and Consolidation Optimization in Permian Coal-rock Strata#br#[J]. Metal Mine, 2026, 55(4): 59-67.

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