Twin 630 bhp C18 power
Two CAT C18 engines at 630 bhp each, through paired Allison M6620AR transmissions, raise the combined output above the 540 bhp twin-engine step and hold a 2250 kN hook rating through long heavy pulls.
Drilling Rigs
850HP Truck Mounted Rigs (XJ850 ZJ40)
The XJ850/ZJ40 is the largest truck-mounted workover rig in the range, sized to a 2250 kN maximum hook load on two CAT C18 engines rated 630 bhp apiece. Each engine drives its own Allison M6620AR transmission, the two sets combined to hoist ten lines of 32 mm (1 1/4-inch) wire in a 5x6 arrangement under a 39 m or 38 m mast, with a fast-line pull of 280 kN. On 4 1/2-inch drill pipe the unit drills to 4000 m, while the same hoisting envelope carries ultra-deep workover strings; that dual drilling-and-workover scope, rather than a single rating, is what positions it above the 1800 kN class. The whole package remains self-propelled, so the largest truck mounted rig in the lineup still relocates without a dedicated heavy-lift convoy.
Core advantages
Designed around the operating requirement.
2250 kN maximum hook load
The 2250 kN maximum load is the highest in the truck-mounted series, sized for the longest, heaviest tubular strings run on ultra-deep overhaul and large geothermal projects.
5x6 reeving, 32 mm line, ten lines
Ten 32 mm lines reeved 5x6 carry the 2250 kN across the hoisting train, keeping the 280 kN fast-line pull within wire and drawworks limits.
39 m / 38 m clearance mast
A 39 m, or 38 m, mast tops the series, clearing the long stands that ultra-deep workover uses and giving the 2250 kN rating a stiff structure to work against.
4000 m drilling plus deep workover
Rated to drill 4000 m on 4 1/2-inch pipe and to work over far deeper completions, the machine does both jobs on one carrier, which is its advantage over a rig dedicated to either.
Self-propelled mobility
Despite the 2250 kN class rating, the unit folds down and drives itself between sites, so the largest rig in the fleet still reaches remote pads that a skid spread would take days to mobilize.
| Product | 850HP Truck Mounted Rigs (XJ850 ZJ40) |
|---|---|
| Product line | Drilling Rigs |
| Drilling depth (4 1/2” DP) m | 4000 |
|---|---|
| Max fastline pull kN | 280 |
| Max. Load kN | 2250 |
| Drill line diameter mm (in) /effective quantity n | Φ32 (1 1/4") /10 |
| Max hoisting speed m/s | 1.4 |
| Traveling system | 5×6 |
| Engine | CAT C18/630 bhp 2 sets |
| Transmission | ALLISION M6620AR 2 sets |
| Clear height of mast m | 39m /38m |
Application
Where this equipment is used.
- The largest truck-mounted workover rig in the range: a 2250 kN hook on 5×6, 32 mm wire under a 39 m or 38 m mast, drilling to 4000 m on 4-1/2 in pipe.
- Ultra-deep workover strings and heavy casing jobs where the 280 kN fast-line pull and twin CAT C18 packs define the working envelope.
- Drilling-and-workover campaigns on one carrier: the unit drills medium-deep wells and then services the same wellbore without a second spread.
- Long-cycle operation on 8000 m-class well service, with twin-engine redundancy protecting uptime.
- Remote cluster relocation: the self-propelled carrier moves the rig as one vehicle over hilly or desert access.
- High-angle and deviated well intervention with headroom for long stands and a stacked BOP.
Next step
Send the operating requirement.
For a useful technical response, include the target well conditions, operating depth or pressure, expected quantity, destination and any required configuration.
Send an InquiryConfiguration
Options for a matched equipment scope.
Available configurations can be matched to the equipment model, operating conditions and project requirements.
- Hook and hoist margin: set the 2250 kN rating, 5×6 line arrangement and mast static load against the heaviest planned string.
- Drilling scope: confirm the 4000 m drilling rating and circulating package if the carrier will drill before workover.
- Power architecture: twin CAT C18 / Allison M6620AR is the standard layout; duty-specific options can be discussed.
- Well-control fit: BOP height, choke manifold and floor layout matched to the mast clearance.
- Winter and heat provisions on 850HP Truck Mounted Rigs (XJ850 ZJ40): low-temperature start, heat preservation and coating matched to the region.
- Documentation and training: manuals, factory test report and first-period spares included; commissioning and training arranged.
Buyer questions
Frequently asked about this equipment.
What buyers check on the 850HP XJ850 ZJ40: the dual drilling-and-workover envelope and the 14×8 all-terrain carrier.
What are the core upgrades of the 850HP XJ850/ZJ40 truck-mounted workover rig compared with the 750HP model?
The step from the 750HP to the 850HP class is the powertrain and the hook rating: the XJ850/ZJ40 runs dual 630 bhp engines and lifts 2250 kN on a 5×6, φ32 mm hoist under a 39 m mast, drilling to 4000 m on 4 1/2″ pipe and working over to 8000 m on tubing. Against the 750HP twin C15 class, the gain is the heavier hook and mast envelope for the longest strings, plus the 14×8 carrier that moves the rig as one road load.
Does the 850HP ultra-heavy rig need professional trailer transportation?
No. In its road configuration the mast is folded and the hydraulic outriggers retracted, and the complete unit travels on its own multi-axle carrier under the twin C18 packs. Neither a crane nor a separate trailer moves the rig between locations, which keeps mobilization short even at this 2250 kN class.
What dual working capabilities does this rig support?
The XJ850/ZJ40 covers both duties on one envelope: 4000 m medium-deep drilling on 4 1/2″ pipe, plus 8000 m workover on the same 2250 kN hook and 5×6, φ32 mm hoist, which suits programs that switch between drilling and heavy overhaul at one location.
Can the equipment operate stably in extreme harsh oilfield environments?
Yes. The whole machine is professionally optimized for extreme working conditions. The upgraded power system, reinforced load-bearing structure and enhanced heat dissipation & dust-proof system ensure stable 24-hour full-load continuous operation in high-temperature desert, severe cold high-altitude and dusty harsh environments.
What after-sales services are provided for the XJ850/ZJ40 rig?
Delivery for the XJ850/ZJ40 includes the full document set, a recommended first-period spare list and continuous remote engineering guidance. On-site installation, commissioning and crew training are led by engineers familiar with the dual C18/M6620AR drivetrain, and service prioritization is arranged for large or remote projects.
Procurement information
Ordering this equipment.
Commercial terms are confirmed in the quotation for the exact configuration, quantity and destination.
Certification & standards
Manufactured to API 4F for ultra-deep well overhaul, heavy-load downhole operations and large geothermal projects, providing heavy-duty hoisting and workover capacity for the harshest wellsite conditions. The derrick is load-tested to its rated hook load at the Jingzhou plant under ISO 9001:2015 quality management, and the full rig undergoes a factory acceptance test before shipment.
Documentation
Operation manuals, chassis documentation and factory test reports are supplied; the PTO and hydraulic system schematics are included for the client's service department. On-site commissioning is available.
Lead time
Confirmed in the quotation according to configuration, quantity and destination.
Warranty & after-sales
Manuals, conventional spare parts and remote technical guidance are included; on-site commissioning and operator training can be arranged on request.
Payment & delivery
Payment schedule, Incoterms, port and packaging are agreed in the sales contract.
Spare parts
A recommended spare-parts list for the first operating period is provided with the quotation.
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