2250kN hook, the fleet maximum
Maximum load is 2250kN on a 5×6 traveling system with Φ32mm wire rope, matched by a 2250kN mast static rating, the lifting margin for integral ten-thousand-meter casing and ultra-heavy tripping.
Workover Rigs
850HP Workover Rig
The XJ850 is the heaviest workover carrier the fleet builds, rated at a 2250kN hook on a 5×6 purchase strung with Φ32mm wire rope under a 39m lattice mast. Its powertrain is twin Caterpillar C18 engines at 630 bhp apiece, each driving through its own Allison M6620AR, feeding a drawworks that pulls 280kN on the fast line and turns to 450rpm. That arrangement services 9000m of 73mm tubing and 5800m of 88.9mm drill pipe, the ten-thousand-meter-class end of well-service work, and the 6m floor carries a ZP275 rotary for heavy casing and rotary-assisted pulls. A reinforced 14×8 all-terrain chassis moves the entire spread between remote ultra-deep clusters as one unit, the redundancy of twin power chosen for campaigns where a lost day on a 9000m well costs more than the rig itself.
Core advantages
Designed around the operating requirement.
Twin CAT C18 at 630 bhp each
Two Caterpillar C18 engines, each rated 630 bhp behind its own Allison M6620AR, deliver the combined torque for 9000m strings while keeping a second power pack in reserve.
39m mast over a 6m floor
A 39m clean-height lattice mast racks the long stands of an ultra-deep program above a 6m drilling floor, sized for the BOP and casing hardware a 9000m well demands.
ZP275 rotary on the deck
The 6m floor carries a ZP275 rotary table, adding rotary torque and heavier pipe handling that plain line-pull service rigs do not offer on ultra-deep wells.
280kN fast-line pull at 450rpm
The drawworks turns out 280kN of fast-line pull at up to 450rpm, converting the twin C18 packs into both hard breaking pulls and controlled tripping speed on 5800m of 88.9mm pipe.
Reinforced 14×8 super-heavy carrier
A reinforced 14×8 self-propelled all-terrain chassis hauls the twin-engine rig, mast and 6m floor as one road load, reaching remote ultra-deep clusters over plateau, desert and frozen-soil access without auxiliary hoisting.
| Product | 850HP Workover Rig |
|---|---|
| Product line | Workover Rigs |
| The depth of work over | 9000m (73mm tubing) 5800m (88.9mm DP) | |
| The max. loading | 2250kN | |
| The type of traveling system | 5×6 | |
| Diameter of rope | Φ32 | |
| Engine | CAT C18/630 bhp, two sets | |
| The model of gear box | Allison M6620AR, two sets | |
| Mast | Clean height | 39m |
| The max. static loading | 2250kN | |
| Draw work | The max. pull of fast line | 280KN |
| Diameter. of wire line | 32mm | |
| The max. rotate speed | 450rpm | |
| Drilling floor | Height | 6m |
| Model of rotary table | ZP275 | |
Application
Where this equipment is used.
- Ten-thousand-metre-class workover on 73 mm tubing to 9000 m and 88.9 mm drill pipe to 5800 m, with the 2250 kN hook rating handling the heaviest casing strings in the fleet.
- Integral casing replacement, heavy stuck-pipe salvage and rotary-assisted pulls through the ZP275 table on 9000 m wells.
- Long-cycle ultra-deep overhaul programmes where the twin CAT C18 / Allison M6620AR packs protect uptime if one drivetrain needs service.
- Relocation between remote ultra-deep clusters as one load on the reinforced 14×8 carrier, without auxiliary heavy-haul equipment.
- Deep-well stimulation and workover combinations where the 39 m mast and 6 m floor stack the BOP and long stands required by the programme.
- High-altitude plateau, frozen-soil and desert access with climate provisions configured at order time.
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 mast margin: set the 2250 kN hook rating, 5×6 line arrangement and 39 m mast static load against the heaviest planned string.
- Rotary scope: confirm the ZP275 table and floor height against casing rotation and rotary-assisted pull requirements.
- Power redundancy: twin CAT C18 / Allison M6620AR packs are the standard layout; single-engine duty can be discussed for lighter programmes.
- Well-control interface: specify BOP height, choke manifold and floor layout to match the 39 m mast and 6 m floor.
- Monitoring and documentation: drawworks load and engine monitoring, manuals, factory test report and first-period spares included; commissioning and training arranged.
Buyer questions
Frequently asked about this equipment.
Questions about the 850HP rig cover the twin-power redundancy and how the 9,000 m envelope is carried.
What core upgrades does the 850HP XJ850 rig have compared with the 750HP model?
The XJ850 takes the twin-engine architecture up a notch: two Caterpillar C18 engines at 630 bhp each, each behind its own Allison M6620AR, lift a 2250kN hook on a 5×6, Φ32mm purchase under a 39m mast. Workover reaches 9000m on 73mm tubing and 5800m on 88.9mm drill pipe, the ten-thousand-meter service end, with a ZP275 rotary on the 6m floor for heavier downhole work than the XJ750 envelope.
Can the XJ850 rig adapt to high-altitude ultra-complex terrain and long-distance relocation?
The reinforced 14×8 all-terrain carrier moves the complete twin-engine rig as one integral load. With the 39m mast laid and outriggers stowed, it drives between remote ultra-deep cluster wells over plateau, desert and frozen-soil roads, the drawworks and 6m ZP275 floor staying rigged, so no auxiliary transport spread and no re-rigging delay are needed on arrival.
What is the standard working depth of the XJ850 workover rig?
On 73mm tubing the rated workover depth is 9000m, and on 88.9mm drill pipe it is 5800m, bounded by the 2250kN hook and 2250kN mast static rating on the 5×6, Φ32mm hoist. Because the twin C18/M6620AR packs and 39m mast set the margin, ultra-deep programs can re-specify floor and rotary options at order time, recorded in the factory test certificate.
What are the main advantages of the 850HP XJ850 rig?
The XJ850 (XJ2250) is the heaviest carrier the fleet builds: a 2250 kN hook on a 5×6, Φ32 mm purchase under a 39 m mast, powered by twin Caterpillar C18 engines at 630 bhp each behind their own Allison M6620AR transmissions. It services 9000 m of 73 mm tubing and 5800 m of 88.9 mm drill pipe, with a ZP275 rotary on the 6 m floor for heavy casing and rotary-assisted pulls. The 2250 kN hook and 2250 kN mast static rating set the load envelope, and twin-power redundancy protects uptime on campaigns where a lost day on a 9000 m well is the dominant cost.
What after-sales services are provided for the XJ850 rig?
The XJ850 ships with installation drawings, operation and maintenance manuals, and a first-period spare list covering the φ32 mm line and the twin C18/M6620AR service parts. Remote guidance is free for the life of the rig, and because the twin packs are shared across the heavy fleet, spares follow one catalog. On-site commissioning and senior operator training are arranged for the first deployment.
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 and API 7K at the Jingzhou super-heavy shop under ISO 9001:2015; the 39m mast is proof-loaded to its 2250kN static rating and the drawworks verified at 280kN fast-line pull and 450rpm before dispatch, and certificate scope is listed in the quotation.
Documentation
Operation manuals, spare-parts catalog and factory acceptance test report are supplied in English and Chinese; on-site commissioning and operator training can be arranged at the Jingzhou plant or at the well site.
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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