Development of M -700 type extracting coalbed methane drill rig

The M-700 type extracting coalbed methane drill rig is a major substance of 《The Research on Rxtracting Coalbed Methane Drilling Equipment and Technology for Nearly Horizontal Longhole Drilling in Collier》 which is a new project of science and technical research in 1997. This thesis introduces briefly the structures, test situations and main technical parameters of the drill rig.