潜孔锤反循环钻进工艺在拉拉铜矿的试验应用

Experimental Application of DTH Hammer Reverse Drilling Technology in Lala Copper Mine

摘要:

针对现有露天矿区空气钻孔作业存在的粉尘污染、岩矿心（样）丢失严重等问题。采用贯通式空气潜孔锤反循环钻进工艺在四川拉拉铜矿露天矿区进行了生产性试验，检验贯通式潜孔锤在露天矿区的钻进效率、粉尘控制以及岩心（样）采取率情况。试验共完成了3个试验孔，进尺483 m，平均钻进效率为8.83 m/h，岩心（样）总长度252.43 m，反循环效果良好，且不同的钻具组合对反循环形成效果无影响，试验现场无粉尘弥散现象。

关键词:贯通式潜孔锤;反循环钻进;露天矿;复杂地层;拉拉铜矿区

Abstract:

According to the existing dust pollution and serious core (sample) loss in air drilling operation in open pit mine, productive experiment was carried out with air DTH hammer reverse circulation drilling technology in Lala copper opencast mine of Sichuan to test the penetration rates, the effects of dust control and core (sample) recovery percentage. The experiment was performed on 3 bore holes with total drilling depth of 483m, average drilling efficiency 8.83m/h and the whole length of core (sample) 252.43m. The effect of reverse circulation drilling was good and different drilling assembly had no influence on the effect of reverse circulation drilling. There was no dust dispersion in the test site.

Key words:DTH hammer; reverse circulation drilling; open pit mine; complex formation; Lala copper mining area