Workover rig manufacturer
Technical Specifications – Complete XJ Series Overview
The table below provides key specifications for SJ Petro XJ series self‑propelled workover rigs. For complete data sheets (dimensional drawings, API certifications, test reports), contact our technical sales team.
XJ Series – Core Model Specifications
| Model | Workover Depth (2-7/8″ DP) | Servicing Depth (2-7/8″ EUE Tubing) | Max Static Hook Load | Nominal Hook Load | Drawworks HP | Engine / Power | Carrier Drive |
|---|---|---|---|---|---|---|---|
| XJ250 | 3,500 m | 3,200 m | 735 kN (165,000 lbf) | 400 kN | 250 hp | Cat C9 / 350 HP | 6×6 or 10×8 |
| XJ350 | 3,200 m | 4,000 m | 900 kN (202,330 lbf) | 600 kN | 350 hp | Cat C9 / 350 HP (or Detroit 400 HP) | 10×8 |
| XJ450 | 4,500 m | 5,500 m | 1,125 kN (252,900 lbf) | 800 kN | 450 hp | Cat C13 / 440 HP | 10×8 |
| XJ550 | 5,800 m | 7,000 m | 1,350 kN (303,000 lbf) | 1,000 kN | 550 hp | Cat C15 / 475 HP | 10×8 |
| XJ650 | 7,000 m | 8,500 m | 1,580 kN (355,200 lbf) | 1,200 kN | 650 hp | Cat C18 / 630 HP | 12×8 |
| XJ1000 | 8,000 m | 8,000 m | 1,800 kN (405,000 lbf) | 1,500 kN | 750 hp | 1,000 HP class | 14×8 |
| XJ1200 | 9,000 m | 9,000 m | 2,250 kN (505,800 lbf) | 1,800 kN | 1,000 hp | 1,000+ HP (dual engine) | 14×10 |
XJ250 – Detailed Technical Parameters
The XJ250 is rated by customers all over the world as the best economic workover rig for its reliable performance, innovative design and economical cost. This light‑duty self‑propelled rig is mainly used for shallow well workover, oil testing, fishing and pump check operations, equipped with a lifting system, single drum drawworks, hydraulically raised double or single mast and a famous engine with Allison hydromechanical transmission. The XJ250 workover rig features fast moving speed and high service efficiency, with maximum travel speed 45 km/h and maximum static hook load 735 kN.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 3,200 m (10,500 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 3,200 m (10,500 ft) |
| Max hook load | 735 kN (165,000 lbf) |
| Engine | Caterpillar C9/ATAAC, 260 kW (350 HP) at 2,100 rpm |
| Transmission | Allison 4700 OFS |
| Mast height | 31 m (102 ft) |
| Racking board capacity | 3,200 m of 2-7/8″ EUE tubing |
| Max travel speed | 45 km/h (28 mph) |
| Carrier drive | Self‑propelled 10×8 |
| Overall dimensions (L×W×H) | 18.5 × 2.9 × 4.2 m |
| Weight | 50,000 kg (110,230 lb) |
XJ350 – Detailed Technical Parameters
XJ350 Drilling & Workover Rig is the most famous product in the international workover rig market. Workover unit has a complete configuration and wide range. It can achieve heavy repairs if provided with substructure and related parts. The mast is available in 31 m, 29 m or 25 m. The chassis has good cross‑country performance – the single drum work‑over rig is with 8×8 full‑driven chassis, and the double drum work‑over rig is with 10×8 chassis.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 3,200 m (10,500 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 4,000 m (13,120 ft) |
| Max hook load | 900 kN (202,330 lbf) |
| Engine | Caterpillar C9 (350 HP) or Detroit S60 (400 HP) |
| Transmission | Allison 4700 OFS or M5610s |
| Mast height | 31.7 m (104 ft) |
| Racking board capacity | 4,000 m of 2-7/8″ EUE tubing |
| Traveling system | 3×4 (Φ26 mm wireline) |
| Max travel speed | 45 km/h (28 mph) |
| Carrier drive | Self‑propelled 10×8 |
| Overall dimensions (L×W×H) | 18.5 × 2.9 × 4.2 m |
| Weight | 51,000 kg (112,440 lb) |
XJ450 – Detailed Technical Parameters
XJ450 Drilling & Workover Rig has a workover depth up to 4,500 m and a service depth up to 5,500 m. Equipped with rotary table, swivel and drilling tools, it can perform as a mobile drilling rig up to 1,500 m depth. The chassis adopts 10×8 drive type, the power unit adopts Caterpillar diesel engine and Allison transmission, and the winch adopts double drum structure.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 4,500 m (14,760 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 5,500 m (18,045 ft) |
| Max hook load | 1,125 kN (252,900 lbf) |
| Engine | Caterpillar C13, 325 kW (440 HP) at 2,100 rpm |
| Transmission | Allison 4700 OFS |
| Mast height | 34 m (112 ft) |
| Racking board capacity | 5,500 m of 2-7/8″ EUE tubing |
| Traveling system | 4×5 (Φ26 mm wireline) |
| Max travel speed | 45 km/h (28 mph) |
| Carrier drive | Self‑propelled 10×8 |
| Overall dimensions (L×W×H) | 18.5 × 3.1 × 4.2 m |
| Weight | 55,000 kg (121,250 lb) |
XJ550 – Detailed Technical Parameters
XJ550 workover rig has a workover depth up to 5,800 m and service depth up to 7,000 m. Equipped with rotary table, swivel and drilling tools, it can perform as a mobile drilling rig up to 2,000 m depth. It is mainly used for medium and shallow well workover, oil testing, fishing and pump check operations.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 5,800 m (19,000 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 7,000 m (23,000 ft) |
| Max hook load | 1,350 kN (303,000 lbf) |
| Engine | Caterpillar C15, 354 kW (475 HP) |
| Transmission | Allison M5610AR |
| Mast height | 35 m (115 ft) |
| Racking board capacity | 2,000 m of 4-1/2″ DP |
| Traveling system | 4×5 (Φ26 mm wireline) |
| Max travel speed | 45 km/h (28 mph) |
| Carrier drive | Self‑propelled 10×8 |
| Overall dimensions (L×W×H) | 19.87 × 3.1 × 4.2 m |
| Weight | 53,000 kg (116,800 lb) |
XJ650 – Detailed Technical Specifications
XJ650 Drilling & Workover Rig is the bestselling heavy duty workover rig of SJ Petro. Equipped with powerful Cat C18 engine, the XJ650 can serve as a 2‑in‑1 rig to perform both workover and drilling operation. This rig is renowned by the powerful capability, stable performance and great mobility by users in South America, Western Africa and Middle East area. The SJ PETRO XJ650 Drilling & Workover Rig is a versatile, heavy‑duty rig, specifically designed for efficient drilling and workover operations. Powered by a robust Caterpillar C18 engine, this rig can reach up to 2,000 m in drilling depth and 7,000 m in workover depth.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 7,000 m (23,000 ft) |
| Drilling depth (3-1/2″ DP) | 2,000 m (6,560 ft) |
| Servicing depth (2-7/8″ EUE tubing) | 8,500 m (27,900 ft) |
| Max static hook load | 1,580 kN (355,200 lbf) |
| Max hook load | 1,575 kN (354,000 lbf) |
| Engine | Caterpillar C18, 470 kW (630 HP) at 2,100 rpm |
| Racking board capacity | 2,000 m of 4-1/2″ DP |
| Wireline diameter | Φ29 mm (1-1/8″) |
| Traveling system | 4×5 |
| Max travel speed | 45 km/h (28 mph) |
| Carrier drive | Self‑propelled 12×8 |
| Overall dimensions (L×W×H) | 19.9 × 3.1 × 4.37 m |
| Weight | 55,000 kg (121,250 lb) |
| Air assist brake system | KOBELT Disc with matched caliper |
XJ1200 – Detailed Technical Specifications
XJ1200 workover rig is the biggest self‑propelled truck‑mounted workover equipment – the heavy‑duty flagship of the XJ series. This rig features a massive 2,250 kN maximum hook load, enabling it to handle deep‑well interventions and heavy pipe strings with ease. Its 14×10 off‑road chassis ensures stable operation across rugged oilfield terrains, while high‑power engine options deliver consistent power for prolonged operations. Built to API 4F/7K/8C standards, it features hydraulic disc brakes and advanced control systems.
| Parameter | Specification |
|---|---|
| Workover depth (2-7/8″ DP) | 9,000 m (29,500 ft) |
| Workover depth (3-1/2″ DP) | 7,500 m |
| Workover depth (4-1/2″ DP) | 6,000 m |
| Nominal hook load | 1,800 kN (404,640 lbf) |
| Max static hook load | 2,250 kN (505,800 lbf) |
| Wireline diameter / effective line quantity | φ32 mm / 10 |
| Mast clearance height | 39.3 m (129 ft) |
| Max lifting speed of hook | 1.36 m/s (4.46 ft/s) |
| Carrier drive | Self‑propelled 14×10 |
| Overall dimensions (traveling) | 22.5 × 3.3 × 4.47 m |
| Weight | 75,000 kg (165,000 lb) |
Applications – Where Our Workover Rigs Excel
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Workover and recompletion – pulling rods, tubing and pumps; fishing; scale removal; zone isolation – covering well depths from 1,000 m to 9,000 m.
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Shallow to medium drilling – when equipped with a rotary table, XJ450, XJ550, XJ650, XJ1000 and XJ1200 can handle drilling operations for medium and shallow wells, saving the cost of a separate drilling spread.
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Fishing and milling – retrieve broken drill pipe, dropped tubing, bit cones and other downhole debris.
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Oil testing and pump check operations – XJ250 and XJ350 are ideal for routine testing and pump maintenance.
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Cluster well development – self‑propelled 10×8, 12×8 or 14×10 carriers allow rapid moves between closely spaced wellheads – no crane, no separate transport.
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Remote exploration – self‑propelled carriers access locations with poor roads and no crane support.
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Arctic campaigns (-45 °C) – low‑temperature materials have been successfully deployed in Russia’s Orenburg field.
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Desert development (55 °C+) – sand‑sealed components, oversized cooling and reinforced chassis for Middle Eastern operations.
Product Types – Workover Rig Configurations We Manufacture
1. Light Workover Rig (XJ250 – XJ350)
Best for: Shallow wells (1,000–3,500 m), light servicing, water wells, oil testing, fishing and pump check operations.
Key model: XJ250 – rated by customers all over the world as the best economic workover rig for its reliable performance, innovative design and economical cost. The XJ350 is the most famous product in the international workover rig market – hundreds of XJ350s with American flag colored derricks are operating across Oklahoma, Texas and Kansas.
2. Medium to Heavy Workover Rig (XJ450 – XJ550)
Best for: Most onshore workover operations – conventional oil, mature fields, wells up to 5,800 m depth. When equipped with a rotary table, these rigs can handle drilling operations for medium and shallow wells.
3. Heavy to Ultra‑Deep Workover Rig (XJ650 – XJ1200)
Best for: Deep wells (7,000–9,000 m), HPHT well intervention and dual‑purpose workover + drilling needs.
Key model: XJ650 – the bestselling heavy duty workover rig of SJ Petro, renowned by users in South America, Western Africa and Middle East for powerful capability, stable performance and great mobility. XJ1200 – the biggest self‑propelled truck‑mounted workover rig with massive 2,250 kN hook load, 14×10 off‑road chassis, and dual engine options.
4. 2‑in‑1 Workover + Drilling Rig
Best for: Operators who need one rig for both well intervention and shallow to medium drilling.
Adds a rotary table, substructure and drilling components to XJ450, XJ550, XJ650, XJ1000 or XJ1200. Can independently complete drilling operations. The XJ650 drilling depth reaches 2,000 m (3-1/2″ DP).
5. Arctic‑Rated Workover Rig
Best for: Siberia, Northern Canada, Alaska – any location where standard equipment fails in extreme cold.
Extended operating temperature range to -45 °C. Includes low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems and insulated hydraulic lines. Features low‑temperature materials with good cold and wind resistance. Proven in Russia.
6. Desert‑Rated Workover Rig
Best for: Middle East, North Africa and other arid basins with ambient temperatures exceeding 55 °C.
Oversized cooling systems (radiators and heat exchangers), sand‑sealed electrical enclosures, dust filtration on air intakes, corrosion‑resistant coatings and reinforced chassis for rough terrain.
7. Retrofit Workover Rig Package
Best for: Operators who already own a rig and want to convert it to a self‑propelled truck mounted unit or add workover capability.
We can supply hydraulic system upgrades, mast raising systems, carrier integration kits and control systems – enabling existing rigs to be upgraded to self‑propelled configuration with modern workover capabilities.
Why Choose SJ Petro as Your Workover Rig Manufacturer?
Because a workover rig is a long‑term investment. You need a manufacturer who designs, builds, certifies and supports every component of the integrated system.
| Your Challenge | SJ Petro’s Answer |
|---|---|
| "I need API certification for an international tender.” | Full API 4F, 7K, 8C certification. Complete documentation packages – MTRs, hydrostatic certificates, NDT reports, API data sheets. Authorized to use API monogram. |
| "My well pad is tight. A conventional rig won’t fit.” | Self‑propelled 10×8, 12×8 or 14×10 carriers – drive onto pad, raise mast hydraulically, no crane required. |
| "I need one rig that can do both workover and drilling.” | XJ450, XJ550, XJ650, XJ1000 and XJ1200 are true 2‑in‑1 rigs – workover at 7,000 m and drilling at 2,000 m when equipped. |
| "I need reliable power components with global parts availability.” | Caterpillar engines + Allison transmissions – industry standard, parts available in every major oilfield worldwide. |
| *"I operate in extreme cold – down to -45 °C.”* | Arctic package – low‑temperature materials, low‑temp hydraulics, battery warmers, engine heaters. Proven in Russia. |
| "I need a rig that can move quickly between wells.” | Self‑propelled design – max travel speed 45 km/h (28 mph), all components mounted on a single carrier, no disassembly required. |
More reasons to trust SJ Petro:
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Sinopec Group heritage – 80+ years of oilfield equipment engineering, founded in 1941, rooted in Jingzhou, Hubei
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Top‑ranked Chinese manufacturer – ranks 2nd on the list of China Top 10 Petroleum Drilling and Production Equipment Manufacturers, rated AAA by China Petrochemical Industry and Banks
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In‑house manufacturing – annual production capacity: 100 workover rigs, 100 drilling rigs, 120 cementing units, 80 fracturing units
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50,000 sqm assembly yard – 24 rigging‑up positions, simultaneous commissioning of 12 drilling or workover rigs
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Global track record – workover rigs delivered to South America, Western Africa, Middle East, United States, Indonesia, Russia and beyond
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Full documentation – material test reports (EN 10204 3.1), structural calculations, load test certificates, as‑built drawings, API data sheets
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Flexible commercial terms – milestone payments (30/40/30), operating leases and direct financing available for qualified buyers
Frequently Asked Questions (FAQ) – Workover Rig Manufacturer
Q1: How do I verify that SJ Petro is a real workover rig manufacturer and not a trading company?
A: We invite you to visit our manufacturing facility in Jingzhou, Hubei, China. You will see our 50,000‑square‑meter assembly yard, our precision machining centers, our API‑certified fabrication shops, and our load test stands capable of testing rigs up to 750 tons. We hold API Q1, API 4F, API 7K, API 8C, ISO 9001, and HSE certifications, and we are a wholly‑owned subsidiary of Sinopec Oilfield Equipment Corporation – one of China’s largest oilfield equipment manufacturers. Trading companies cannot produce these credentials.
Q2: What workover depths can your XJ series rigs reach?
A: Our XJ series covers the full depth spectrum:
| Model | Workover Depth (2-7/8″ DP) | Drilling Depth (3-1/2″ DP) |
|---|---|---|
| XJ250 | 3,500 m (11,500 ft) | — |
| XJ350 | 3,200 m (10,500 ft) | — |
| XJ450 | 4,500 m (14,760 ft) | 1,500 m (4,920 ft) |
| XJ550 | 5,800 m (19,000 ft) | 2,000 m (6,560 ft) |
| XJ650 | 7,000 m (23,000 ft) | 2,000 m (6,560 ft) |
| XJ1000 | 8,000 m (26,200 ft) | — |
| XJ1200 | 9,000 m (29,500 ft) | — |
Maximum hook load ranges from 300 kN to 2,250 kN (67,440–505,800 lbs), with installed power from 235 HP to 1,300 HP.
Q3: Are your workover rigs API certified?
A: Yes. Our XJ series is designed and manufactured in accordance with API Spec Q1, 4F, 7K, 8C and relevant standards. We are authorized to use API monogram on products under API 4F, 7K, 8C, 6A and 16C. For international tenders, we provide complete certification packages including material test reports, hydrostatic certificates, NDT reports, API data sheets and as‑built drawings.
Q4: What is the lead time for a workover rig?
A: Standard lead times from order confirmation:
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XJ250–XJ350 (standard configuration): 4–5 months
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XJ450–XJ550 (standard configuration): 5–6 months
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XJ650–XJ1200 (standard configuration): 6–8 months
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Custom builds (arctic, desert, drilling package): 8–10 months
Expedited delivery may be available – contact our sales team.
Q5: Do you offer financing or leasing for workover rigs?
A: Yes. For qualified buyers, we offer direct financing through partner banks (terms up to 5 years), operating leases (low monthly payments) and milestone payment plans (30/40/30). Contact our sales team for a lease proposal.
Q6: What is the warranty on a workover rig?
A: 12 months after commissioning or 18 months after shipment – whichever occurs first. The warranty covers manufacturing defects on all components (carrier, engine, transmission, drawworks, mast, hydraulic system). Wear parts are not covered but are available as spares. Extended warranty (up to 5 years) is available for an additional fee.
Q7: Do you provide operator training for workover rigs?
A: Yes. For every rig purchase, we include 1–2 weeks of on‑site training during commissioning, covering rig operation, maintenance, safety protocols, mast raising, and emergency procedures. Digital manuals, video tutorials and remote support are also provided.
Q8: Can your workover rigs operate in extreme cold (-45 °C) or extreme heat (55 °C+)?
A: Yes. Our standard rigs are designed for -20 °C to +55 °C operation. For more extreme conditions, we offer specialised packages:
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Arctic package (-45 °C) – low‑temperature materials enable operation in temperatures as low as minus 45 degrees, with good cold and wind resistance.
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Desert package (55 °C+) – oversized cooling systems, sand‑sealed electrical enclosures, dust filtration, corrosion‑resistant coatings.
Q9: What safety features are included on your workover rigs?
A: Our rigs include: KOBELT disc brake systems (air assist), anti‑collision ring valve type anti‑collision crown‑block device (electronic anti‑collision crown‑block optional), automatic mast lock systems, fail‑safe hydraulic valves (close on loss of power), wind speed monitoring systems with automated alarms, and emergency stop buttons at multiple locations.
Q10: Do you supply downhole workover tools as part of the workover rig package?
A: Yes. Through our subsidiary SJS Ltd. and our extensive supply network, we provide a full range of downhole workover tools including overshots, fishing spears, taper mills, junk mills, section mills, bridge plugs (API 11D1 V3 certified), cement retainers, retrievable packers, bumper jars, hydraulic jars and safety joints. Tools are classified by fish type: tubular fishing tools, rod fishing tools, cable fishing tools, logging tool fishing tools and miscellaneous small‑object fishing tools.
Q11: Can I see a workover rig in operation before purchasing?
A: Yes. We welcome customer visits to our factory in Jingzhou, China, where you can inspect rigs under construction and witness load testing. For international customers, we can arrange visits to active field sites in the United States (Oklahoma, Texas, Kansas), South America, Western Africa, the Middle East, Indonesia or Russia where XJ series rigs are currently operating.
