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（一）瑞典于七十年代研制成功DIAMEC系列高速全液压金刚石钻机，并发展了薄壁钻头钻进技术。在中硬至坚硬岩层中采用TT型和T_2型薄壁钻头和双层岩芯管钻进取得了很好的效果。例如用TT46金刚石钻头所钻出的岩芯直径为35.6毫米，相当于DCDMA标准的BQ规格钻头钻出的岩芯（36.5毫米），而机械钻速却提高了，因为薄壁钻头的壁厚只有5.2毫米，而BQ钻头的壁厚为11.78毫米。也就是说，用TT46薄壁金刚石钻头钻进，有效切削面积比BQ钻头减少了62％，因而需要的给进力和扭
(I) Sweden successfully developed the DIAMEC series of high-speed full hydraulic diamond drilling rigs in the 1970s and developed the thin-walled bit drilling technology. In the hard to hard rock with TT and T_2 type thin-walled drill and double core tube drilling has achieved good results. For example, a core diameter of 35.6 millimeters, which is drilled with a TT46 diamond drill bit, is equivalent to a core drill (36.5 millimeters) drilled by a DCDMA standard BQ drill bit, while ROP is increased because the wall thickness of a thin- 5.2 mm, while the BQ bit has a wall thickness of 11.78 mm. In other words, with the TT46 thin-walled diamond drill bit drilling, the effective cutting area than the BQ drill reduced by 62%, which requires the power and twist