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恩口煤矿区中的大冶灰岩孔斜比较严重。该煤层产于二迭系龙潭组，上部为三迭系下统大冶灰岩，厚度850～950米，可钻性4～5级，岩层呈薄层和极薄层状产出，单层厚0.2～10厘米，层理、节理、裂隙都非常发育，层理面上附着光滑的炭泥质薄膜，岩层倾角20°～88°，小型褶曲发育。由于层薄而硬、脆、软交错，极易造成孔斜。过去施工的钻孔，每百米一般为4°～5°，个别钻孔达6°～10°。为防治孔斜，曾采用合金钻进、钻铤加压、加长岩心管、带扶正器以及初级定向钻进等多种措施，虽不同程度起过一些作用，但一直达不到每百米不超过2°的要求。去年本来安排对深部煤层进行勘探，由于孔斜未能过关，只得暂时停止施工。
Enkou coal mine in the Daye limestone hole oblique more serious. The coal seam is produced in the Longtan Formation in the Permian System. The upper part of the coal seam consists of the Lower Ordovician limestone in the Lower Triassic System with a thickness of 850-950 meters and a drillability of 4-5 grades. The strata are characterized by thin and extremely thin layers, Thick 0.2 ~ 10 cm, bedding, joints, fissures are very developed, smooth surface attached to the muddy carbon film, rock dip angle of 20 ° ~ 88 °, the development of small folds. As thin and hard, brittle, soft staggered, easily lead to hole oblique. The construction of the past drilling, generally every 100 meters 4 ° ~ 5 °, individual drilling up to 6 ° ~ 10 °. For the prevention and control of hole oblique, alloy drilling, collar collapsing, extension of the core tube, with centralizer and primary directional drilling and other measures, although played a role in varying degrees, but has not reached every 100 meters Exceed 2 ° requirements. Last year, arrangements were made for exploration of deep coal seams, and construction of the coal seams had to be stopped temporarily due to the failure of crossing holes.