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磁海为一磁铁矿床,由1545、1555两矿区和外围异常点所组成,上钻十余年,共施工253个钻孔,投入钻探工作量80532米,而1545矿区施工深孔120个,完成钻探工作量51470米,平均孔深429米,最深钻孔1000米。主要采用钢粒钻进,孔径φ110MM,使用X B—1000A型和XU—600型钻机,使用JDL—1型陀螺测斜仪。1545矿区钻孔弯曲严重,顶角上漂,单孔最大百米平均增量为8°48′,方位角顺时针方向弯曲,单孔最大百米平均增量为38°24′。由于受地层的影响曾采用各种防斜工具和防斜方法,如扶正器、稳定接头、厚壁岩心管、钻挺加压、双水口钻头、反转、反循环钻具等,控制钻进技术参数使用小压力,中转速、小钢粒,少投砂等,很难抑制方位角的急剧变化,一般孔深在200米左右方位角就达210多度。有的钻机一孔开三次,三次都不行。报废工作量越来越多,也严重地影响了钻进效率,在总结前期施工中钻孔弯曲规律的基础上,经过和地质协商,确定改变开
Magnetite is a magnetite deposit composed of 1545,1555 mines and outlying anomalous points. It was drilled for more than ten years and 253 boreholes were drilled in total, 80,532 meters were drilled and 120 deep holes were drilled in 1545, completing Drilling work volume 51470 meters, the average hole depth of 429 meters, the deepest hole 1000 meters. The main use of steel drilling, diameter φ110MM, the use of XB-1000A and XU-600-type rig, the use of JDL-1 gyro inclinometer. The 1545 mine borehole was severely bent with a drift over the top corner. The average single-hole maximum hundred-meter increment was 8 ° 48 ’. The azimuth angle was curved clockwise and the average single-hole average increase was 38 ° 24’. Due to the influence of strata, various anti-skew tools and anti-skew methods have been adopted, such as centralizer, stabilizer joint, thick-walled core pipe, drilling and pressing, double nozzle, reverse drilling, Technical parameters The use of small pressure, speed, small steel, less sand, etc., it is difficult to suppress the dramatic changes in azimuth, the general hole depth of about 200 meters azimuth reached 210 degrees. Some drill a hole three times, three times will not work. More and more scrapped workloads have also seriously affected the drilling efficiency. Based on the conclusion of the drilling and bending rules in the pre-construction period and after consultation with the geology,