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Workover system

Technical Specifications – Complete XJ Series Workover System

The table below provides key specifications for SJ Petro XJ series workover systems. For complete data sheets (dimensional drawings, API certifications, test reports), contact our technical sales team.

XJ Series – Complete Model Lineup

Model	Workover Depth (2-7/8″ DP)	Nominal Hook Load	Max Static Load	Drawworks HP	Carrier Drive	Rotary Table
XJ150	~2,000 m (6,560 ft)	300 kN	585 kN	235 HP	6×4	Optional
XJ250	3,200 m (10,500 ft)	400 kN	735 kN	250 HP	10×8	Optional
XJ350	3,200 m (10,500 ft)	600 kN	900 kN	350 HP	10×8	Optional
XJ450	4,500 m (14,760 ft)	800 kN	1,125 kN	450 HP	10×8	Standard
XJ550	5,800 m (19,000 ft)	1,000 kN	1,350 kN	550 HP	10×8	Standard
XJ650	7,000 m (23,000 ft)	1,200 kN	1,580 kN	650 HP	12×8	Standard
XJ1000	8,000 m (26,200 ft)	1,500 kN	1,800 kN	750 HP	14×8	Standard
XJ1200	9,000 m (29,500 ft)	1,800 kN	2,250 kN	1,000 HP	14×10	Standard

All models are self‑propelled on heavy‑duty carriers with Caterpillar engines and Allison transmissions. Rotary table optional on light models, standard on XJ450 and above.

XJ250 – Detailed System Specifications

The XJ250 is widely regarded as the best economic workover rig for its reliable performance, innovative design, and cost‑effectiveness.

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)
Rated hook load	400 kN (90,000 lbf)
Max hook load	735 kN (165,000 lbf)
Engine	Caterpillar C9, 260 kW (350 HP) at 2,100 rpm
Transmission	Allison 4700 OFS
Derrick 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)

XJ650 – Detailed System Specifications

The XJ650 is renowned for its powerful capability, stable performance, and great mobility across South America, Western Africa, and the Middle East.

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)

Applications – Where SJ Petro Workover Systems Excel

SJ Petro workover systems are deployed across all types of well intervention and remedial operations worldwide:

Workover and recompletion – pulling rods, tubing, and pumps; fishing; scale removal; zone isolation – covering well depths from 1,000 m to 9,000 m.
Shallow to medium drilling – when equipped with a rotary table, XJ450 and above can handle drilling operations for medium and shallow wells, saving the cost of a separate drilling spread.
Fishing operations – retrieve broken drill pipe, dropped tubing, bit cones, and other downhole debris using our complete suite of fishing tools.
Milling and section milling – cut damaged casing sections and dress fish tops with our full range of milling equipment.
Zone isolation and plug‑back – set bridge plugs (API 11D1 V3 certified) and cement retainers for abandonment or remedial cementing.
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.
Remote exploration – self‑propelled carriers access locations with poor roads and no crane support.
Arctic campaigns (-45 °C) – proven in Russia’s Orenburg field with delivered cold‑weather drilling rigs.
Desert development (50 °C+) – sand‑sealed components, oversized cooling, and reinforced chassis for Middle Eastern operations.
Offshore platform intervention – fixed‑platform workover rigs (SHXJ series) with hook loads from 900 to 2,250 kN, corrosion‑protected, DNV/ABS certification available.

Product Types – Workover System Configurations from SJ Petro

We organize our workover system offerings by application complexity and well depth.

1. Light Workover System (XJ150 – XJ350)

Best for: Shallow wells (1,000–3,200 m), light servicing, water wells, well testing, fishing, pump checks. Key model: XJ250 – widely regarded as the best economic workover rig worldwide. Features Caterpillar C9 engine, Allison 4700 OFS transmission, and 10×8 self‑propelled carrier. Power system, control system, traveling system, and drawworks are all mounted on the main carrier, saving space and enabling fast rig moves.

2. Medium to Heavy Workover System (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 (parallelogram substructure, complete with ladders, walkway, handrails, and mouse hole), these rigs can handle drilling operations for medium and shallow wells. Key model: XJ550 (SXJ550) – 550 hp drawworks power, seven‑axle heavy‑duty off‑road chassis, proven export success.

3. Heavy to Ultra‑Deep Workover System (XJ650 – XJ1200)

Best for: Deep wells (7,000–9,000 m), HPHT well intervention, and dual‑purpose 2‑in‑1 workover + drilling needs. Key model: XJ650 – best‑selling heavy‑duty workover rig, powered by Caterpillar C18 engine (470 kW / 630 HP) on a 12×8 self‑propelled carrier. XJ1200 – our most powerful self‑propelled workover system, rated for 9,000 m workover depth with a massive 2,250 kN static load on a 14×10 self‑propelled carrier.

4. Arctic‑Rated Workover System

Best for: Siberia, Northern Canada, Alaska – any location where standard equipment fails in extreme cold. Features: Heated control cabins, low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems, insulated hydraulic lines. SJ Petro has exported truck‑mounted cold‑weather drilling rigs to Russia, where they have proven their reliability in extreme conditions.

5. Desert‑Rated Workover System

Best for: Middle East, North Africa, arid basins with ambient temperatures exceeding 50 °C. Features: Oversized cooling systems, sand‑sealed electrical enclosures, dust filtration on air intakes, corrosion‑resistant coatings, reinforced chassis for rough terrain.

6. Offshore Fixed‑Platform Workover System

Best for: Offshore platforms requiring compact, corrosion‑protected workover equipment. Features: Skid‑mounted design, corrosion‑protected components, DNV/ABS certification available, diesel or electric drive.

7. Complete Turnkey Workover System (Custom)

For operators who want everything from a single source, we supply fully integrated turnkey workover systems including: XJ series self‑propelled workover rig (Caterpillar + Allison), SOFElink digital management platform, optional rotary table and substructure for drilling capability, full downhole tool package (fishing tools, milling tools, bridge plugs), comprehensive spare parts kit (tailored to expected operating hours), and on‑site commissioning and operator training. One purchase order, one warranty, one point of contact.

Why Choose SJ Petro for Your Workover System?

Because a workover system is a long‑term investment. You need a manufacturer who designs, builds, certifies, and supports every component – from the carrier to the control system to the downhole tools.

Your Challenge	SJ Petro’s Answer
"I need API certification for an international tender.”	Full API 4F, 7K, 8C certification. API monogram available. Complete documentation packages including MTRs, hydrostatic certificates, and NDT reports.
"I need a system that can move between wells quickly without a crane.”	Self‑propelled 10×8, 12×8, or 14×10 carriers – drive to location, raise mast hydraulically, no separate transport vehicles required.
"I want a system that can do both workover and drilling.”	XJ550, XJ650 and above are true 2‑in‑1 systems. Workover at 7,000 m and drilling at 2,000 m when equipped with a rotary table and parallelogram substructure.
"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 environments – arctic or desert.”	Arctic and desert packages available. Proven track record across six continents. XJ series operating temperature range from -45 °C to +50 °C.
"I want a single manufacturer for both the rig and the tools.”	We manufacture workover rigs and supply a full range of downhole workover tools – one source for your entire workover system.

Frequently Asked Questions (FAQ) – Workover System

Q1: What is the difference between a workover rig and a workover system?

A: A workover rig is the mechanical equipment – the carrier, mast, drawworks, and power system. A workover system includes the rig plus digital management (SOFElink), optional rotary drilling capability, downhole tools (fishing, milling, isolation), spare parts, commissioning, training, and ongoing support. SJ Petro delivers complete workover systems – not just rigs.

Q2: What workover depths can your XJ series systems reach?

A: Our XJ series covers the full depth spectrum: XJ250 reaches 3,200 m (10,500 ft), XJ450 reaches 4,500 m (14,760 ft), XJ550 reaches 5,800 m (19,000 ft), XJ650 reaches 7,000 m (23,000 ft), XJ1000 reaches 8,000 m (26,200 ft), and XJ1200 reaches 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 systems API certified?

A: Yes. Our XJ series workover systems are designed and manufactured in accordance with API Spec Q1, 4F, 7K, 8C and relevant industry standards. We are authorized to use the API monogram. For international tenders, we provide complete certification packages. Third‑party witness testing (SGS, BV, DNV) is available upon request at buyer’s expense.

Q4: What is the lead time for a complete workover system?

A: Standard lead times from order confirmation:

XJ250–XJ350 (standard configuration): 4–5 months
XJ450–XJ550 (standard configuration): 5–6 months
XJ650–XJ1200 (standard configuration): 6–8 months
Custom builds (arctic, desert, special requirements): 8–10 months
Downhole tools (fishing tools, mills, bridge plugs): 2–4 weeks for stocked sizes

Expedited delivery may be available – contact our sales team.

Q5: Do you offer financing or leasing for workover systems?

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% deposit, 40% prior to shipment, 30% after site acceptance).

Q6: What is the warranty on a workover system?

A: 12 months after commissioning or 18 months after shipment – whichever occurs first. The warranty covers manufacturing defects on all components. Wear parts are not covered but are available as spares. Extended warranty (up to 5 years) is available for an additional fee.

Q7: Can I buy a refurbished workover system to save costs?

A: Yes. We occasionally have trade‑ins from customers upgrading their fleets. Refurbished systems are completely disassembled, inspected, fitted with new wear parts, repainted, load tested, and come with a 6‑month warranty. Price is typically 40–60% of new. Contact our sales team for current inventory.

Q8: What is included in the on‑site commissioning and training?

A: For every workover system purchase, we include 1–2 weeks of on‑site training during commissioning (depending on system complexity), covering rig operation, maintenance, safety protocols, rotary table operation, downhole tool handling, and SOFElink digital management. Digital manuals, video tutorials, and remote support are also provided.

Q9: Do you supply downhole workover tools as part of the system?

A: Yes. Through our subsidiary SJS Ltd., we supply 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, and retrievable packers. We also supply bumper jars, hydraulic jars, safety joints, circulation subs, and lead impression blocks. Tools are classified by fish type: tubular fishing tools (overshots, spears, die collars), rod fishing tools, cable fishing tools, logging tool fishing tools, and miscellaneous small‑object fishing tools. This integrated approach simplifies procurement and ensures compatibility.

Q10: Can your workover systems operate in extreme cold (-45 °C) or extreme heat (50 °C+)?

A: Yes. We offer specialized packages for extreme environments:

Arctic package (-45 °C) – Heated control cabins, low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems, insulated hydraulic lines. SJ Petro has exported truck‑mounted cold‑weather drilling rigs to Russia’s Orenburg Drilling Company.
Desert package (50 °C+) – Oversized cooling systems (radiators and heat exchangers), sand‑sealed electrical enclosures, dust filtration on air intakes, corrosion‑resistant coatings, reinforced chassis for rough terrain.

Q11: How does SOFElink digital management benefit my workover system?

A: SOFElink provides real‑time equipment parameters (engine speed, transmission gear, pump displacement, oil temperature), fault alarms, operation reports (weekly, monthly, quarterly, annual), customizable maintenance plans with proactive reminders, intelligent health diagnostics of key components, and remote visibility from any location. By analyzing cumulative operational data, SOFElink helps you transition from reactive repairs to planned interventions – reducing unplanned downtime and extending equipment life.

Q12: How do your workover system prices compare to other manufacturers?

A: For equivalent specifications (same hook load, same depth capacity, same API certification), SJ Petro workover systems are typically 15–25% lower than Western brands, and highly competitive with other Chinese manufacturers. The difference reflects direct factory pricing, 40+ years of manufacturing efficiency, and our Sinopec supply chain advantage. We are happy to provide a side‑by‑side comparison quote based on your specific requirements.

Q13: Can I see a workover system in operation before purchasing?

A: Yes. We welcome customer visits to our factory in Jingzhou, China, where you can inspect workover systems under construction and witness load testing. For international customers, we can arrange visits to active field sites in South America, Western Africa, the Middle East, Indonesia, or Russia where XJ series systems are currently operating.

Q14: What documentation do you provide for international shipping and import compliance?

A: For every workover system shipment, we provide material test reports (EN 10204 3.1), hydrostatic test certificates (1.5× MWP), NDT reports (MT, PT, UT), API data sheets (API 4F, 7K, 8C), dimensional inspection reports, as‑built drawings, operation and maintenance manuals, certificate of origin, commercial invoice, packing list, and bill of lading. We also provide compliance documentation for US road legal requirements, Russian GOST/EAC, and other regional standards.

Q15: How do I get a firm price quote for a complete workover system?

A: Contact our technical sales team with:

Required workover depth (or target well depth)
Required hook load capacity
Do you need drilling capability (rotary table and substructure)?
Power source preference (diesel drive only; electric drive available on request for select models)
Carrier drive preference (8×8, 10×8, 12×8, 14×10, etc.)
Do you need a full downhole tool package (fishing, milling, bridge plugs)?
Any special requirements (arctic, desert, API monogram, SOFElink, etc.)
Delivery destination