| Abstract:In recent years, the Xitieshan main ore belt has gradually entered the deep ore prospecting, and the distribution and reserves of deep ore deposits have been identified mainly by means of tunnel drilling in the underground mine, in the course of tunnel drilling, there are some difficult problems such as airport chamber support, drilling in broken stratum, coring in water sensitive stratum, treatment of water gushing stratum, etc. , the accidents such as sticking, burying and collapse occurred in the drilling hole, which lead to the scrapping of the drilling hole and restrict the prospecting process. Through strengthening chamber support, selecting reasonable drilling parameters, optimizing drilling structure, formulating drilling fluid formula for complex formation and using quick-setting cement to seal off, etc. , it ensures the construction safety of the tunnel airport, effectively solves the difficult drilling problems of various complex formations in the area, reduces the accident rate in the hole and the drilling scrap rate, and improves the drilling efficiency and drilling quality, it provides reference for drilling construction in similar formation in the future. |
