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无岩心钻进的钻头,一般直径都在91公厘以上。最近,我队根据小径取心钻进优越于大径取心钻进的原理,设计了三种直径为75公厘的不取心的小径钻头。试验和使用后效果良好,效率大为堤高。试用的条件是孔深在550公尺以内,用500型及300型钻机,开孔就用75公厘无岩心钻头钻进。我们的体会如下:一、小直径无岩心钻头钻进提高效率的几点主要理论根据:
Coreless drilling bit, the general diameter of more than 91 mm. Recently, my team designed three diameter-less 75-inch diameter small-diameter drill bits based on the principle that small-diameter coring drilling is superior to large-diameter coring drilling. After the test and the effect is good, the efficiency of the embankment high. The probationary condition is that the hole depth is within 550 meters. With the Model 500 and 300 drilling machines, the hole is drilled with a 75 mm coreless drill bit. Our experience is as follows: First, a small diameter non-core drill bit to improve efficiency of several major theoretical basis: