China Casing Tube Overburden Casing Drilling System Mk-Mre-190, Find details about China Casing Drilling System, DTH Hammer Bit from Casing Tube Overburden Casing Drilling System Mk-Mre-190
MRE Concentric under reaming drilling system
MRE Concentric under reaming drilling system is designed for unstable ground conditions. In the process of drilling, it could carry down the casing pipe to the hole to protect wall to achieve drilling work. At clockwise condition, eccentric part expanded to bring the casing tube into hole. After finished, eccentric bit closed anticlockwise and then can be lift up by the drilling machine. This type is especially suitable for diameter 114-273mm.
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