CAJ | 학술논문

为解决松软突出煤层钻进难、成孔难这一问题，我们研制了一种偏心跟管 PDC 钻头，并研究了施工过程中的参数对钻进效率和钻头寿命的影响。结果显示：PDC偏心钻头能够比较快速的破碎岩石，适用于煤系地层的瓦斯抽采孔钻进。但对于松软煤层钻进过程，其需要较大的水路以充分冷却钻头及排除岩粉。对现场施工的研究表明，合理的切削角和侧转角，以及相应的空间参数，能够保证 PDC 钻头快速破碎岩石，并提高钻头寿命。
위해결송연돌출매층찬진난、성공난저일문제，아문연제료일충편심근관 PDC 찬두，병연구료시공과정중적삼수대찬진효솔화찬두수명적영향。결과현시：PDC편심찬두능구비교쾌속적파쇄암석，괄용우매계지층적와사추채공찬진。단대우송연매층찬진과정，기수요교대적수로이충분냉각찬두급배제암분。대현장시공적연구표명，합리적절삭각화측전각，이급상응적공간삼수，능구보증 PDC 찬두쾌속파쇄암석，병제고찬두수명。
To slove the problem of drilling in soft and outburst coal seam an excentric bit that drills with casing is developed and the drilling parameters are studied to enhance the efficiency and lifetime of the bit Results show that the PDC excentric bit could break rocks quickly thus suitable for the drilling of gas drainage hole in coal-bearing strata But for the soft coal strata it requires more water to cool the bit and wash away rock powders Results show that the PDC bit could cut rocks quicker and last longer when drilling at reasonable cutting angle side angle and related spatial parameters.