碎软煤层高螺旋复合排渣定向钻进技术试验研究

doi:10.11799/ce202210012

摘要/Abstract

摘要： 针对碎软煤层液动定向钻孔施工中存在的钻孔排渣困难、钻进效率低及成孔难的问题，分析了碎软煤层钻孔失稳特征，依据钻杆单位煤渣搅动体积越大越有利于螺旋排渣，提出“高螺旋机械排渣为主、液动排渣为辅”的复合排渣方式，研制出了98mm焊接螺旋钻杆，且试验对比分析了三种规格螺旋钻杆的结构特征与排渣能力。在王坡矿开展现场试验，施工了4个孔深300m以上钻孔，试验结果表明：98mm焊接螺旋钻杆钻进效率可达30.6m/班，单位进尺返渣量可达270kg/m，钻进效率与排渣能力较89mm螺旋钻杆和89mm三棱螺旋钻杆都提高了1倍以上，形成适用于碎软煤层高效排渣顺层定向钻孔成孔工艺方法。

关键词: 碎软煤层, 液动定向钻进, 钻具组合, 钻进效率, 复合排渣

Abstract: In view of the problems of difficult drilling slag discharge, low drilling efficiency and difficulty in forming holes in the construction of hydrodynamic directional drilling in broken soft coal seams, analysis of the instability characteristics of boreholes in broken soft coal seams. According to the larger stirring volume of coal slag per unit of the drill pipe, the more conducive to spiral slag discharge, a composite slag discharge method with high spiral mechanical slag discharge as the main and hydraulic slag discharge as the auxiliary is proposed. The Φ98mm welded spiral drill pipe is developed, and the structural characteristics and slag discharge capacity of three specifications of spiral drill pipes are compared and analyzed.A field tests were carried out in Wangpo Mine and four boreholes with depth over 300 m were constructed.The test results showed that the drilling efficiency of Φ98 mm welded auger rods could reach 30.6 m/shift, and the amount of slag returned per unit footage can reach 270 kg/m, and the drilling efficiency and slag discharge capacity are more than doubled compared with Φ89 mm auger pipe and Φ89 mm triangular auger pipe, formation of directional drilling equipment and technology suitable for high-efficiency slag discharge in crushed and soft coal seams.

中图分类号:

TD421

张宏杰, 张杰, 杨帅, 等. 碎软煤层高螺旋复合排渣定向钻进技术试验研究[J]. 煤炭工程, 2022, 54(10): 62-67.

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