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反循环钻进技术的实质,就是在于能以较小的功率和设备能力,使孔内冲洗介质达到一定的上返速度,完成较大口径的钻进排除钻屑工作,有利于提高排除钻屑的效率,从而提高钻进速度,例如向内径为105毫米的钻杆内送入4米~3/分,压力为5.6公斤/厘米~2的压缩空气,混合器沉没到一定深度条件下,钻杆内泥浆上返的速度可达到1.5～3米/秒,携带排出钻屑的粒径可达90×80×50(毫米),从而大幅度减少重
Reverse circulation drilling technology is the essence, that is, with less power and equipment capacity, the hole flushing medium to achieve a certain rate of return to complete the larger diameter drill to exclude drill work, help to improve the exclusion of cuttings , So as to improve the drilling speed. For example, compressed air with a pressure of 5.6 kg / cm ~ 2 is fed into a drill pipe with an inner diameter of 105 mm at a pressure of 4 to 3 minutes. The mixer sinks to a certain depth and the drill Slurry on the rod back to the speed of up to 1.5 ~ 3 m / s, carrying the drill cuttings up to 90 × 80 × 50 (mm), thus significantly reducing the weight