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一九八四车,我队进入水城格目底煤田。该煤田地层的钻进特点是:岩层可钻性级别不高(Ⅲ—Ⅵ级),硬夹层不厚且不很硬(Ⅶ—Ⅷ级),地形切割厉害,或涌或漏甚至在一个钻孔中涌漏(水)兼而有之的现象较为普遍,煤系厚,岩层含泥质重,水敏性强;煤层多,标志层不清。 为了有效地推行绳取钻进,以期用先进工艺突破取心质量关、复杂地层关和深孔施工关。我们即开始了合金绳取钻进的研究。自八四年四月开始至八五年底,已在十二个孔的局部或全孔进行了(生产)试验,最大试验孔深540.35米,总工作量3401米。
1984 car, my team into the water city grid at the end of the coal field. The drilling characteristics of the coalfield strata are as follows: the drillability of rock formations is not high (Ⅲ-Ⅵ), the hard interlayer is not thick and not very hard (Ⅶ to Ⅷ), the terrain is severely cut, or even a drill Hole in the leakage (water) and the phenomenon of both the more common, thick coal, rocky muddy weight, strong water sensitivity; coal and more marked layer unclear. In order to effectively implement the rope drilling, with the advanced technology to breakthrough the coring quality, complex strata and deep hole construction off. We started the study of alloy rope drilling. Since April, 1984 and the end of 1985, a total of 540.35 meters of test holes have been drilled in partial or full holes in 12 holes with a total workload of 3,401 meters.