断层构造影响下气井保护煤柱留设与压煤开采研究

Research on protect coal pillars and coal mining in gas wells under influence of fault structure

我国西南某煤矿井田范围内钻有大量天然气井,该地区地质条件复杂,断层构造发育,“三下”开采难度大。研究区内气井及其井场位于F_(1)断层之上,留设过小煤柱会造成气井及其井场所在地表及岩层移动,致使气井井筒损坏,发生天然气泄露事故,煤柱留设过大又会造成煤炭资源浪费,为减小F1断层影响,同时避免煤柱留设过大,文中分别在F1断层两翼采用地质剖面计算煤柱范围,取重叠部分作为气井及其井场的保护煤柱,并通过采动影响分析,确保天然气井的正常运行。

A large number of the natural gas wells had been built within a coal mine field in southwest in China.Geological conditions were complex in the area.A lot of faults had been developed,and the coal min-ing was difficult under buildings,railways and water.Gas wells and the well sites were located above F_(1) fault in the study area.Leaving the small coal pillars would cause the movement of the ground and rock formations where the gas wells and the well sites were located,resulting in the damage to the gas well boresand the natural gas leakage accidents.If the coal pillars were too large,it would cause the waste of the coalresources.To reduce the influence of F_(1) fault and avoid setting the large coal pillars,in this paper,the ran-ges of the protection coal pillars were calculated by using the geological sections on the two wings of F_(1) fault,the overlapping parts were taken as the protective coal pillars of the gas wells and the well sites,theimpact of mining was analyzed to ensure the normal operation of the natural gas wells.