This paper presents the results of a unique study conducted by the National Institute for Occupational Safety and Health (NIOSH) from 2016 to 2019 to evaluate the effects of longwall-induced subsurface deformations on shale gas well casing integrity and underground miner safety and health. At both deep-cover and shallow-cover instrumentation sites, surface subsidence measurements, subsurface in-place inclinometer measurements, and underground pillar pressure measurements were conducted as longwall panels were mined. Comparisons of the deep-cover and shallow-cover test site results with those from a similar study under medium cover reveal an interesting longwall-induced response scenario. Under shallow and medium covers, measured horizontal displacements within the abutment pillar are one order of magnitude higher than those measured under deep cover. On the other hand, measured vertical compressions under deep cover are one order of magnitude higher than those under shallow and medium covers. However, FLAC^3D simulations of the casings indicate that, in all three cases, the P-110 production casings remain intact under longwall-induced deformations and compressions, which has serious implications for future mine design in areas where shale gas wells have been drilled ahead of mining.

本文介绍了美国国家职业安全与健康研究所（NIOSH）2016年至2019年进行的一项独特研究的结果，以评估长壁诱发的地下变形对页岩气井套管完整性和地下矿工安全与健康的影响。在深层和浅层仪器现场，在开采长壁板时都进行了地面沉降测量，地下就地倾角仪测量和地下支柱压力测量。将深覆盖和浅覆盖测试站点的结果与中等覆盖下类似研究的结果进行比较，发现了一个有趣的长壁诱发响应场景。在浅层和中层的掩护下，在基台柱内测得的水平位移比在深覆盖下测得的水平位移高一个数量级。另一方面，深层覆盖下测得的垂直压缩比浅层和中层覆盖下测得的垂直压缩高一个数量级。但是，FLAC套管的^3D模拟表明，在所有三种情况下，P-110生产套管在长壁引起的变形和压缩情况下都保持完好无损，这对于未来在开采前页岩气井已钻探的地区的矿山设计产生了严重的影响。