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目前,大直径钻机在我国相继问世。但是当钻孔截面达到7～8米~2时,就相当于一个大汽车的车厢面积。如果以0.5米/时的钻速在岩层中钻进,那么它每小时就要钻去3.5米~2～4米~2的岩石,此时若在砂岩中钻进,岩屑的重量就有8.4吨～9.6吨重。这样多的岩屑,必须及时排到地面,才能保证正常钻进。因此必须解决大直径井筒钻进中的排渣问题。目前广泛采用“反循环洗井,压气升液”法排渣。现就我参加钻机设计、试验工作的体会,就其原理、设计计算,有关问题的探讨等几方面分述如下,供参考.
At present, large diameter drill have come out in our country one after another. However, when the borehole cross section reaches 7 ~ 8m ~ 2, it is equivalent to the area of a large car. If drilling at a drilling rate of 0.5m / h in a rock formation, it drills rocks of 3.5m ~ 2 ~ 4m ~ 2 every hour. At this time, if drilling in sandstone, the weight of rock cuttings will have 8.4 tons ~ 9.6 tons of weight. Such cuttings, must be promptly discharged to the ground in order to ensure normal drilling. Therefore, it is necessary to solve the problem of slag discharge in drilling of large diameter boreholes. At present widely used “reverse circulation well washing, gas lift” slag discharge method. Now I participate in drilling rig design, experimental experience, on its principles, design calculations, the issue of discussion and other aspects are described below, for reference.