The ZJ70-4500D is a DC-electric drilling rig built for the 7000m class, rated 4500–7000m on 114mm pipe (4000–6000m on 127mm) around a 4500kN hook on a 6×7 string reeved with φ38mm line. Where the VFD skid mounted rigs use an AC-VFD-AC bus, this ZJ70-4500D skid mounted rig runs a DC electric drive with independent and compound control modes, fed by four 1200kW diesel gensets. The 1470kW (2000hp) drawworks and the stepless rotary are controlled through that DC system, and the circulation plant pairs two 1600hp pumps with a φ952.5mm (37.5”) rotary table under a 45.5m K-type derrick on a 10.5m substructure. It is a drilling-oriented unit — selected for long-cycle batch drilling of ultra-deep wells rather than for the drilling-plus-workover dual duty of the VFD skids.
The hoisting system is rated for a 4500kN maximum hook load, reeved 6×7 with φ38mm drill line. That string carries the long-string trips and casing runs of the 7000m program, with the derrick and substructure sized for the repeated cyclic loads of batch drilling.
Power is delivered through a mature DC electric drive rather than an AC-VFD-AC bus, with four 1200kW diesel gensets feeding the system. Independent and compound control modes give the rig flexible, smooth stepless speed regulation on both the drawworks and the rotary, with the familiar serviceability of DC drives.
The drawworks delivers 1470kW (2000hp) under stepless speed regulation through the DC drive. Smooth startup and speed change, without rigid mechanical shock, suit the long rotary hours and precise drilling-control demands of complex ultra-deep formations.
A 45.5m K-type integral derrick and reinforced substructure carry the hoisting loads, with all key load-bearing components passing NDT non-destructive testing. Integral welding and stress-relief treatment give the derrick the rigidity and wind resistance needed for years of cyclic heavy-load drilling.
Circulation is served by two 1600hp mud pumps, and the φ952.5mm (37.5”) rotary table supports high-torque rotary drilling and large-diameter casing running. The combination handles the high-pressure, high-temperature wellbore conditions that accompany ultra-deep holes.
Unlike the VFD skids that also run deep workover, this unit is specified as a drilling rig for cluster and batch ultra-deep campaigns. The fixed skid, DC drive and batch-drilling layout are chosen for long-run drilling performance in desert, Gobi and high-altitude fields.
| Product | ZJ70 4500D Rig |
|---|---|
| Product line | Drilling Rigs |
| Nominal drilling depth (114mm DP) | 4500～7000m | Open diameter of rotary table | φ952.5mm (37.5” ) |
| (127mmDP) | 4000～6000m | Qty.× power of diesel engine | 4×1200kW |
| Max.hook load | 4500kN | Shift of drawwork | stepless speed regulation |
| Traveling system | 6×7 | Height of substructure | 10.5m |
| Dia of drill line | φ38mm | Mast type and height | Ktype, 45.5m |
| Qty.× power of mud pump | 2×1600hp | Drawworks power | 1470kW（2000hp） |
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Send an InquiryAvailable configurations can be matched to the equipment model, operating conditions and project requirements.
Buyers evaluating the ZJ70-4500D rig usually ask about the 4,500 m drilling depth and heavy-duty configuration.
The ZJ70-4500D heavy-duty electric drilling rig has a rated maximum drilling depth of 7000 meters with 4-1/2” drill pipe and 6000 meters with 5” drill pipe, specially developed for ultra-deep oil and gas well exploration and development projects.
Against mechanical and diesel-driven rigs, the DC electric drive gives full stepless speed regulation, smooth start-up without rigid impact and precise parameter control, with higher transmission efficiency and lower noise and energy consumption, which is what long-cycle, high-intensity ultra-deep drilling programs need from the drawworks and rotary.
The rig is laid out for hard and interbedded formations: the DC electric drive holds steady output through high-pressure, high-temperature ultra-deep wellbore conditions, the reinforced K-type derrick is NDT-checked on its load parts, and the skid operates on plateau, low-temperature and muddy sites with the climate package specified at order time.
The hoisting train carries the load: a reinforced 45 m K-type derrick with NDT checks on the load-bearing parts, a high-load hoisting system, and a DC drive that holds steady torque and power output under continuous heavy service, with multi-level safety protection and the circulating system sized for the 7000 m class.
Configuration is handled at order time: drive mode, auxiliary systems, safety protection level, monitoring functions and environmental adaptations are matched to the formation, climate and engineering conditions of the project, and the verified envelope is recorded in the factory test report.
Commercial terms are confirmed in the quotation for the exact configuration, quantity and destination.
The ZJ70-4500D Rig is a heavy-duty ultra-deep well DC electric drilling rig, strictly designed and manufactured in accordance with API Spec 7K and API Spec 8C international petroleum industry standards.
Drilling manuals, rig inspection reports and load-test certificates are supplied; the skid dimensions and manifold drawings are provided for site integration. Rig-up supervision is available.
Confirmed in the quotation according to configuration, quantity and destination.
Manuals, conventional spare parts and remote technical guidance are included; on-site commissioning and operator training can be arranged on request.
Payment schedule, Incoterms, port and packaging are agreed in the sales contract.
A recommended spare-parts list for the first operating period is provided with the quotation.
Explore nearby products to compare equipment scope before sending an inquiry.
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