Research and application of large-diameter DTH hammer casing drilling technology for straight drainage wells
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摘要: 王台铺矿矿井关闭后的涌水对临近矿井安全生产造成了严重的影响，实施大直径直排井进行排水是降低上述影响的重要手段。根据煤层地质及涌水量，直排井井眼直径设计为?650 mm，垂深205 m。由于目的层为巷道且穿过3号煤层采空区，常规钻进方法对目的层安全产生一定的影响，且其钻速慢、成本高。为此，提出了一种大直径潜孔锤跟管钻进新技术，利用潜孔锤进行碎岩，利用跟套管降低环空上返面积进而降低风量要求，有效解决了大直径井眼空气钻进风量需求大、成本高的技术问题。该技术在王台铺矿3口大直径直排井施工中的应用表明，该跟管钻进技术耗气量低、排渣效果好、密封性能优良，平均建井周期20天，平均时效10 m，大幅提高了大直径井眼的钻进效率，降低了钻探成本。Abstract: Water gushing after the closure of Wangtaipu Mine has threaten the safety production of adjacent mines. Water drainage with large-diameter straight drainage wells is an important approach to reduce the above impact. According to the coal seam geology and water inflow， the diameter of the straight drainage well is designed as ?650 mm. Since the target stratum is a roadway and passes through the goaf of No.3 coal seam， the conventional drilling method will somehow compromise the safety of the target stratum， and it also has slow drilling speed with high cost. To this end， this paper proposes a new casing drilling technology with the large-diameter DTH hammer， where the rock is broken by the DTH hammer， and the casing is used to reduce the up-hole annulus area， hence the the air consumption， eliminating effectively the technical problems of large air volume demand and high cost in large-diameter air drilling. This paper expounds the working principle， characteristics and equipment composition of the technology， and analyzes its application results in the construction of three large diameter straight drainage wells in Wangtaipu Mine. Field application shows that this technology has low air consumption， good cleaning of cuttings and excellent sealing performance. The average well construction period of the 3 large diameter straight drainage wells is 20 days with the average drilling efficiency of 10m/h. It greatly improves the large diameter drilling efficiency， reduces the drilling cost and provides important reference for large diameter drilling.
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Key words:
- larger diameter borehole /
- air drilling /
- DTH hammer casing drilling /
- wellhead seal /
- mine well safety
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