mining drilling rig,drilling rig
6.Water well drill rig in the drilling process, the gate must concentrate our thinking attention to the formation changes and the rotation of the drill pipe leading, according to the sound of the turntable, the footage of the speed of rotation of the drill pipe to judge the formation changes that have been change layer to stop the turntable, slightly lift the drill pipe. Such as the mud layer, lift the drill pipe, drill pipe immediately counterclockwise rotation. Such as sand, lift the drill pipe, drill pipe does not rotate, under stratum transform, down into the sample to sample.