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目前,我队开动三台人造金刚石钻机,两年来的生产试验表明,在7～9级石英、辉石闪长岩中钻进,小时效率比钢粒钻进提高1～2倍,钻孔质量好,事故少。然而,能不能充分发挥人造金刚石钻进的优越性,使其台效和实进尺亦相应地比钢粒钻进提高1～2倍呢?我队钻探工人和技术人员曾进行过多次探讨。就我队来说,人造金刚石钻进台效之所以不能成倍地超过钢粒钻进,原因之一是纯钻率较低。特别是在人力拧卸管的情况下,每次起下钻既费力又费时间。采用双管钻进,岩心管不能配得太长,因此虽然井下钻头进尺很好,亦不得不按时起钻。另外,双管钻进要求卡簧质量、规格与钻头配套严格,否则在特别完整地层(岩心很长,不易拔断)或特别破碎的地层中钻进时,常发生岩心堵塞或采不上岩心。这种情况在井浅时还好处理,井深了起下钻一次要
At present, our team started three man-made diamond drilling rigs. The two years of production tests show that the drilling efficiency is improved by 1 to 2 times higher than that of steel grains in the 7-9 grade quartz and pyroxene diorite. The drilling quality Well, fewer accidents. However, can not give full play to the superiority of synthetic diamond drilling, making its table efficiency and actual footage is also a corresponding increase of 1 to 2 times more than the drilling of steel? Drilling team and our team have conducted many discussions. As far as my team is concerned, the reason why synthetic diamond drilling table efficiency can not double over the grain drilling is one of the reasons that the pure diamond rate is lower. Especially in the case of human unscrewing tubes, it takes time and effort to drill each time. The use of double pipe drilling, core pipe can not be too long, so although the downhole drill into the well, also had to start from time to time. In addition, the double-pipe drilling requires the quality of the retainer, the specifications and the rig supporting strict, or in a particularly complete formation (core is very long, difficult to pull off) or particularly broken into the formation, often occur core plugging or mining core . This situation is well handled in the well, well drill down once again