... in research, design, manufacturing and assembly of land oil drilling rig and equipments for oil exploration and development since 2000 ... /900DB, ZJ30/1700DB, ZJ40/2250DB, ZJ70/45000DB.Compound drive drilling rig includes ZJ30/1700LDB, ZJ40/2250LDB, ZJ50/3150LDB, ZJ70 ... in Baoji city, Shaanxi Province, which is the biggest drilling production base, so related equipments are fully furnished here.Technical ...