drilling rigs including electric, mechanical and compound drive drilling rig. Power transfer type:mechanical,AC-VFD-AC,AC-SCR-DC ... 2000HP Drilling RigsConformity with API Spec 4F, 7K, 8C Specifications.Rig modelZJ70/4500DBZJ70/4500DZJ70/4500LZJ70/4500LDBNominal drilling depth (4 1/2 ... design new and transformative types according to users' requirements. Drilling Rig