Patent ID: 8336614

Claim:
A well drilling rig for drilling either on-shore or off-shore new in-line arranged oil, gas, mineral and water wells or for servicing in-line non productive wells with well heads emerging from the ground to a height of at least three meters, said drilling rig including a drilling mast supporting a vertically upward and downward movable drilling rotary head, said drilling mast being operatively associated with a plurality of operating means selected from the group comprising pipe and drilling bit and stabilizer container means, pipe gripping and loader means, drilling bit and stabilizer element gripping and loader means, motor driving means, and a control operator cab, characterized in that said drilling mast and all said plurality of operating means are operatively supported either on a ground movable substructure or on a water surface floating platform, and that said drilling mast comprises a fixed or telescopic mast construction having a static hook load capability up to 1000 metric tons with an up and down useful operating stroke of said rotary head of substantially minimum 30 meters, said rotary head being bidirectionally vertically supported by a number of vertical worm screw—nut screw assemblies extending through substantially an overall height of said drilling mast.