... years,drilling machine,drilling equipemnt,drill rig,oil refinery,oil platform For your quality assurance ,we are API certified ,and ... are lead free. we are one of just five mainland china factories which can matufacture drilling rig. The mechanical / AC ... in energy saving Basic Parameter Of Varied RigsModelZJ90LDBNominal drilling depth, m 9,000Max. hook load, kN5850Max. drill string weight, kN3000Dia ...