... ZJ70LDB Nominal drilling depth, m:5000,7000 Description1)The mechanical / AC VF electric compound drive rig with independent rotary ... its service life, achieves the wellbore quality, increases the mechanical penetration rate greatly, and prevents downhole accident. 4)The ... table is independent electric drive,drawworks and mud pump are mechanical driveTotal power hp.50005000 Drilling rigs,Oil rigs, ...