900kN load on an eight-line hoist
The traveling system reeves Φ26mm wire rope over eight lines for a 650kN nominal and 900kN maximum hook rating, the extra lines turning a single-winch pull into the casing-repair loads a 250hp rig cannot hold.
Workover Rigs
350HP Workover Rig (XJ350)
The XJ350 opens the heavy-duty tier: a 900kN maximum load on a 650kN nominal hook, reeved eight lines over Φ26mm drill line under a 23.5m mast. That hoist works 4000m of 2 7/8″ thickened drill pipe in routine workover and 3200m on standard 2 7/8″ pipe for heavier overhaul, the step from medium-shallow service into casing repair and stuck-pipe work. Power is a 350hp diesel through an Allison automatic transmission, and the whole rig rides a 10×8 all-terrain carrier rather than a highway chassis. The hook pulls at up to 1.1 m/s and the spread weighs 31,490kg, so it reaches medium-deep clusters in hilly or remote oil country without a separate heavy-haul escort.
Core advantages
Designed around the operating requirement.
4000m thickened-pipe envelope
Routine workover reaches 4000m on 2 7/8″ thickened drill pipe, with 3200m available on standard 2 7/8″ pipe for heavier overhaul, covering the medium-deep window between the 250 and the 450 class.
23.5m mast, 1.1 m/s trip speed
A 23.5m lattice mast supports the eight-line purchase while the drawworks trips the hook at up to 1.1 m/s, balancing load capacity against cycle time on medium-deep wells.
Allison automatic transmission
The 350hp engine drives through an Allison automatic that shifts under load, keeping the drawworks pulling smoothly when a long stuck string breaks free.
10×8 all-terrain carrier
A 10×8 self-propelled chassis carries the full mast, drawworks and floor as one load at 31,490kg, reaching dispersed medium-deep clusters over rough roads without re-rigging on arrival.
Built for heavy wellbore treatment
The forged load-bearing structure is specced for large casing work, severe paraffin blockage and high-pressure flushing, the heavy-duty jobs that sit above routine light maintenance.
| Product | 350HP Workover Rig (XJ350) |
|---|---|
| Product line | Workover Rigs |
| Workover depth (2 7 / 8 " thicken DP) (m) | 4000 |
|---|---|
| Overhaul workover depth (2 7/8” DP) (m) | 3200 |
| Nominal hook load (kN) | 650 |
| The max. loading (kN) | 900 |
| The height of mast (m) | 23.5 |
| The diameter of rope/effective number of rope (mm/n) | Φ26/8 |
| Maximum pulling speed of hook (m/s) | 1.1 |
| The dimension of moving state (including mast) (m) | 13910×2705×4320 |
| Weight of the whole set (kg) | 31490 |
Application
Where this equipment is used.
- Routine workover to 4000 m on 2 7/8 in thickened drill pipe and 3200 m on standard pipe, with a 650 kN nominal / 900 kN maximum hook.
- Casing repair, stuck-pipe work and heavy overhaul where the Φ26 mm eight-line train and 210 kN-class pull set the envelope.
- Medium-deep cluster campaigns in hilly and remote oil country: the 10×8 all-terrain carrier relocates the rig without a heavy-haul escort.
- Long-cycle heavy maintenance on mature medium-deep blocks where the 350 hp diesel / Allison automatic drivetrain sustains repeated hoisting.
- High-angle and deviated well service where the 23.5 m mast gives headroom for long stands.
- Desert, Gobi and high-altitude service for 350HP Workover Rig (XJ350) is covered by the climate provisions confirmed in the quotation.
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: confirm the 900 kN maximum rating, eight-line Φ26 mm arrangement and 23.5 m mast against the planned strings.
- Drive: 350 hp diesel with Allison automatic transmission is standard; transmission and emission options can be discussed.
- Chassis: 10×8 all-terrain carrier is the reference fitment; axle and road-permit requirements confirmed for the region.
- Well-control fit: BOP stack height and floor layout matched to the 23.5 m mast clearance.
- Cold-climate fit for 350HP Workover Rig (XJ350): low-temperature start, heat preservation and coating confirmed against the operating site.
- For 350HP Workover Rig (XJ350): manuals, factory test report and first-period spares included; commissioning and operator training arranged on request.
Buyer questions
Frequently asked about this equipment.
Buyers evaluating the XJ350 usually ask about its 4,000 m thickened-pipe depth, 900 kN load and eight-line hoist.
What are the core upgrades of 350HP XJ350 rig compared with 250HP model?
The XJ350 opens the heavy-duty tier: maximum load steps to 900 kN with a 650 kN nominal hook, reeved eight lines over Φ26 mm drill line under a 23.5 m mast. Workover depth reaches 4000 m on 2-7/8″ thickened drill pipe and 3200 m on standard pipe, powered by a 350 hp diesel through an Allison automatic transmission on a 10×8 all-terrain carrier. Versus the XJ250 the gain is both depth and lifting margin for casing repair and stuck-pipe work, and the 10×8 chassis removes the need for a separate heavy-haul escort on hilly routes.
Is the XJ350 rig suitable for complex terrain frequent relocation?
Yes. The XJ350 carries the full mast, drawworks and floor as one 31,490kg load on its 10×8 all-terrain carrier, so it moves between dispersed medium-deep clusters over hilly or rough roads without a separate heavy-haul escort or crane on site. The 10×8 drive is the answer for clusters where a highway-chassis rig would need road permits and off-load hauling.
What is the standard working depth of the XJ350 workover rig?
The standard XJ350 reaches 4000m in routine workover on 2 7/8″ thickened drill pipe, and 3200m on standard 2 7/8″ pipe for heavier overhaul, bounded by the 650kN nominal / 900kN maximum hook and the eight-line Φ26mm hoist. Where a block runs longer strings or heavier casing, the mast and hoisting parameters are set at order time and the verified limits recorded on the certificate.
What unique working conditions can the 350HP rig handle?
The XJ350 is the bridge between the light 150/250 HP class and the 450 HP deep-well rig: the 650 kN nominal (900 kN maximum) hook on the eight-line Φ26 mm reeve lifts the pulls that the 250 HP class reaches its rating on, while the 10×8 carrier still moves between dispersed medium-deep clusters as one road load. The jobs it does that the light rigs slow on are heavy paraffin washing, long casing pulls, stuck-pipe fishing and sustained high-rate trips on 2 7/8″ pipe to 4000 m. If the program is mostly shallow workover under 3000 m, the 250 HP class is the better cycle-time choice; if a meaningful share of wells sit above 3200 m or demand repeated heavy pulls, the XJ350 is the step.
What after-sales support is available for the XJ350 heavy-duty rig?
Every unit ships with operation and maintenance manuals, a factory test report covering the 900kN mast proof load and 1.1 m/s hoist check, and a first-period spare list for the Φ26mm line and Allison transmission. Remote guidance is free for the life of the rig; on-site commissioning and senior operator training are arranged for the start of a medium-deep heavy-repair program.
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 international petroleum machinery standards at the Jingzhou plant under ISO 9001:2015 quality management; the 23.5m mast is proof-loaded to its 900kN class and the drawworks checked at 1.1 m/s 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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