废弃矿井地下气化大直径排气钻孔过老空区技术实践

在当今全球倡导低碳经济的环境下,利用煤炭地下气化技术对已闭坑矿井遗留的煤炭资源进行二次回采在全球多地已取得成效。煤炭地下气化施工过程中存在大直径排气钻孔经过采空区时很难施工的难题,很大程度上对工程进度和安全生产都造成影响。基于此,工程技术人员经过合理论证及施工组织,采取水泥浆堵漏,充填裂隙,多次钻进、扫孔、纠斜、规则孔径等方法措施,成功解决该项难题,取得了很好的经济效益和社会效益。 Coal mining in global low-carbon economy means that just taking primary recovery would waste resources.The second recovery in many abandoned coal mines with underground coal gasification technology have made great achievements.But drilling large diameter exhaust hole through goaf restricts the project progress and safety in production.To resolve this problem,through reasonable demonstration,taking measures as follows:plugging and filling fracture with cement slurry,adopting compound drilling technology,cleaning bottom of holes,straightening and regulating holes.These measures bring obvious economic and social benefits