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用清水作为冲洗液在风化层进行钻探施工,因风化岩石硬度小,胶结性差;在钻进中由于冲洗液的冲刷作用和钻具回转的碰撞而产生大量的、颗粒较粗的岩粉.这些岩粉一部分被冲洗液排到孔外,其余颗粒较大的仍然残存在孔内;随着钻孔的不断加深,粗颗粒的岩粉在孔内越积越多,使套管不能顺利下到硬盘.只好采用随钻孔的加深逐步加长套管的跟管法钻进,使套管能下到硬盘.但是,由于孔内残存的岩粉仍没有排除,套管长度增加后,回转阻力增大,容易发生憋泵、埋钻或套管接手滑扣、断裂等事故.即使采用跟管法将套管下到硬盘,也因为积聚在孔内的岩粉没有排除而对套管产生挤埋作用,致使终孔后套管起拔困难,浪费时间,影响生产.
Water is used as a flushing fluid in the weathered layer for drilling construction due to weathering rock hardness is small, poor cementing; in the drilling due to flushing fluid flushing and drilling tool to produce a large number of large, coarse particles of rock. These Part of the rock powder is discharged to the outside of the hole by the rinsing liquid, and the remaining particles still remain in the hole. As the drilling deepens, coarse particles of rock dust accumulate in the hole to make the casing fail to go down smoothly Hard disk. Had to use the deepening of the drill hole to gradually increase the casing with the pipe method of drilling, so that the casing can be down to the hard disk. However, due to the remaining rock hole is still not ruled out, the casing length increases, the rotation resistance increases Large, prone to hold pump, buried drill or casing take over the slider, fracture and other accidents. Even with the tube method to the casing down to the hard disk, but also because the accumulation of rock powder did not rule out the casing squeeze Role, resulting in the final hole after the casing pulling difficulties, a waste of time, affecting production.