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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Application of Water Jet Assisted Drilling and Slotting Technology in Top Coal Softening and Gas Drainage
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Application of Water Jet Assisted Drilling and Slotting Technology in Top Coal Softening and Gas Drainage

机译：射流辅助钻槽技术在顶板软化瓦斯抽放中的应用

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It is the results of the field trials of high pressure water jet assisted drilling with slotting and benchmark monitoring of conventional rotary drilling without slotting at the Chenjiashan Mine that are analyzed. The field trials followed the previously trial using high pressure water infusion to soften the top coal for block caving longwall face conducted at the Chennjiashan Mine. The monitoring program was aimed at determining the benefit of water jet assisted drilling in terms of increasing in borehole depth and gas drainage efficiency due to low torque and thrust required, opening the bore wall cleats by water jets, and slotting for top coal softening of longwall face. The field trials utilized the underground HP water pump with 200l/min flow rate at pressure of 45MPa, high pressure drill rods of 63.5mm in diameter, high pressure water jet assisted drill bits, MK-5 drill rig and high pressure water swivel with seal pressure of 130MPa. The depth of slots achieved are about 600mm each side and the drilling rate is increased up to 30% with high pressure water jet assisted drilling. In additional to the field trials, a series of laboratory tests were also conducted to determine the water pressure required for deep slotting and to optimize the jet nozzles. The depth of slotting achieved in laboratory tests was above 740mm.
机译：它是高压水射流辅助钻探的现场试验，随着传统的旋转钻孔的开槽和基准监测，在陈嘉山矿分析的情况下进行常规旋转钻孔。现场试验遵循先前试验使用高压水输液，以软化在ChennjiaShan矿区进行的块塌陷的长墙脸上的顶部煤。监测计划旨在确定采用钻孔深度和燃气排水效率的水喷射辅助钻探的益处，因为所需的低扭矩和推力，通过水喷射打开孔壁防滑孔，并对长壁的顶部煤气软化开槽脸。现场试验利用地下HP水泵，在45MPa的压力下，直径为63.5mm的高压钻杆的压力下，高压水射流钻头，MK-5钻机和高压水旋转，带有密封，高压水钻杆，高压水钻杆。 130MPa的压力。所实现的槽的深度每侧约为600mm，钻井率高达30％，高压水射流辅助钻孔。在额外的实地试验中，还进行了一系列实验室测试以确定深槽所需的水压并优化喷射喷嘴。在实验室测试中实现的开槽深度高于740mm。

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