This drilling rig is mainly used for drilling service in 800m-4000m(4-1/2 DP) depth oil, ... water well and coal gas well. This drilling rig is mainly used for drilling service in 800m-4000m(4-1/2 DP ... users requirements.(9) Perfect solid control, well control, high pressure manifold system and generator house, air source house, doghouse and mud pump set, which ...