顾桥矿煤层气地面井稳定性分析及结构优化  

Stability Analysis and Structure Optimization of Coalbed Methane Surface Well in Guqiao Mine

作　　者：路洁心 施式亮[1] 罗新荣 李贺[1,2] 鲁义 徐超平[1] LU Jiexin;SHI Shiliang;LUO Xinrong;LI He;LU Yi;XU Chaoping(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《矿业工程研究》2022年第3期31-38,共8页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(51904103,51974120,51974119)。

摘　　要：针对淮南顾桥矿煤层埋深大、地应力高、煤层气地面井易错断、瓦斯抽采效率低等问题,采用数值模拟方法研究地面井失稳时空演化规律.结果表明:水平地应力均一性越差,套管挤压破坏程度越高;顶板水平速度越快,套管剪切破坏越严重,适当减小管径并增大壁厚有利于防止地面井剪切破坏;将地面井布置在采空区内侧10~20 m处,有利于井身维持稳定及瓦斯抽采.提出在围岩与护壁套管之间、护壁套管与技术套管之间、技术套管与产气套管之间注入G级油井水泥固井方案,该矿采用此方案后,地面井钻井成功率显著提高,稳定性增强.The coal seams in Huainan Guqiao mine are characterized by large buried depth and high in-situ stress. The coalbed methane surface wells are easily broken, and the gas extraction efficiency is low. To solve this problem, the temporal and spatial evolution law of surface well instability is simulated in this paper. Results show that the worse the horizontal stress uniformity is, the higher the damage degree of casing extrusion. The higher the horizontal velocity of the roof is, the more serious the casing shear failure. The arrangement of surface well 10~20 m inside goaf is conducive to not only the stability of well body, but also to the gas extraction. Based on this, G grade oil well cement cementing is proposed. Cement slurry of Grade G oil well cement is injected between the surrounding rock and the casing, between the casing and the technical casing, and between the technical casing and the gas producing casing. After the application in Guqiao mine, the well completion rate increases, and the well stability improves.

关 键 词：地面井 挤压破坏 剪切破坏 井身结构优化 

分 类 号：TD712[矿业工程—矿井通风与安全]