Workover solutions

Technical Specifications – Workover Solutions Platform

The table below provides key specifications for SJ Petro XJ series workover rigs – the core of our workover solutions. For complete data sheets (dimensional drawings, API certifications, test reports, downhole tool catalogues and WHCP specifications), contact our technical sales team.

XJ Series – Core Workover Specifications

Model	Workover Depth (2-7/8″ DP)	Nominal Hook Load	Max Static Hook Load	Drawworks HP	Engine / Power	Carrier Drive	Mast Height
XJ250	3,200 m (10,500 ft)	400 kN	735 kN (165,000 lbf)	250 hp	Cat C9 / 350 HP	10×8	31 m
XJ350	3,200 m (10,500 ft)	600 kN	900 kN (202,330 lbf)	350 hp	360 HP class	10×8	31.7 m
XJ450	4,500 m (14,760 ft)	800 kN	1,125 kN (252,900 lbf)	450 hp	Cat C13 / 440 HP	10×8	34 m
XJ550	5,800 m (19,000 ft)	1,000 kN	1,350 kN (303,000 lbf)	550 hp	Cat C15 / 475 HP	10×8	35 m
XJ650	7,000 m (23,000 ft)	1,200 kN	1,580 kN (355,200 lbf)	650 hp	Cat C18 / 630 HP	12×8	35 m
XJ750	8,000 m (26,200 ft)	1,500 kN	1,700 kN (382,000 lbf)	750 hp	Dual Cat C15 / 440 HP each	14×8	38 m
XJ1200	9,000 m (29,500 ft)	1,800 kN	2,250 kN (505,800 lbf)	1,000 hp	1,000+ HP (dual engine)	14×10	39.3 m

Specifications based on SJ Petro product catalog. XJ450 and above equipped with rotary table for 2‑in‑1 workover and drilling capability.

XJ650 – Detailed Workover Solution Parameters (Best‑Selling Heavy‑Duty Model)

Parameter	Specification
Drilling depth (3-1/2″ DP)	2,000 m (6,560 ft)
Workover depth (2-7/8″ DP)	7,000 m (23,000 ft)
Workover depth (3-1/2″ DP)	5,500 m (18,000 ft)
Workover depth (4-1/2″ DP)	4,200 m (13,800 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
Transmission	Allison
Carrier drive	Self‑propelled 12×8
Mast clearance height	35 m (115 ft)
Racking board capacity	2,000 m (4-1/2″ DP)
Traveling system	4×5
Max travel speed	45 km/h (28 mph)
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
Max wind resistance	30 m/s (98 ft/s)

XJ550 – Detailed Workover Solution Parameters (Versatile Mid‑Depth Model)

Parameter	Specification
Workover depth (2-7/8″ DP)	5,800 m (19,000 ft)
Workover depth (3-1/2″ DP)	4,500 m (14,760 ft)
Workover depth (4-1/2″ DP)	3,600 m (11,800 ft)
Drilling depth (mobile)	2,000 m (6,560 ft)
Servicing depth (2-7/8″ EUE tubing)	7,000 m (23,000 ft)
Rated hook load	1,000 kN (224,800 lbf)
Max hook load	1,350 kN (303,500 lbf)
Engine	Caterpillar C15, 354 kW (475 HP)
Transmission	Allison M5610AR
Derrick height	35 m (115 ft)
Racking board capacity	2,000 m of 4-1/2″ DP
Traveling system	4×5
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	53,000 kg (116,800 lb)

Applications – Where Our Workover Solutions Deliver Results

Our workover solutions 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, XJ550, XJ650 and XJ750 can handle drilling operations for medium and shallow wells, saving the cost of a separate drilling spread.

• Fishing and milling – retrieve broken drill pipe, dropped tubing, bit cones and other downhole debris using our complete suite of API‑certified fishing tools (overshots, spears, junk baskets, magnetic spears).

• Zone isolation and plug‑back – set SHMB drillable bridge plugs (API 11D1 V3 certified) and cement retainers for abandonment or remedial cementing.

• Cluster well development – self‑propelled 10×8, 12×8, 14×8 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) – SJ Petro has delivered cold‑weather ZJ40 drilling rigs to Orenburg Drilling Company in Russia, specially designed for arctic areas.

• Desert development (55 °C+) – sand‑sealed components, oversized cooling and reinforced chassis for Middle Eastern operations.

• XJ650 fields – the XJ650 rig is highly popular among users across South America, Western Africa, and the Middle East, providing reliable performance in diverse and challenging environments.

Product Types – Complete Workover Solutions We Deliver

1. Complete Workover Solution (Rig + Tools + WHCP + Training)

Best for: Operators who want a single integrated solution from rig to wellhead automation. Includes XJ series self‑propelled rig (model selected by depth), full downhole tool package (fishing, milling, isolation tools), wellhead control panel with SCADA interface, on‑site commissioning and 2 weeks of operator training.

2. Light Workover Solution (XJ250 – XJ350)

Best for: Shallow wells (1,000–3,500 m), light servicing, water wells, oil testing, fishing and pump check operations. XJ250 is rated as the best economic workover rig worldwide for reliable performance, innovative design and economical cost.

3. Medium to Heavy Workover Solution (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.

4. Heavy to Ultra‑Deep Workover Solution (XJ650 – XJ1200)

Best for: Deep wells (7,000–9,000 m), HPHT well intervention and dual‑purpose workover + drilling needs. XJ650 is the bestselling heavy‑duty workover rig, renowned for powerful capability, stable performance and great mobility across South America, Western Africa and the Middle East. XJ1200 is the biggest self‑propelled truck‑mounted workover rig with 2,250 kN hook load and 14×10 carrier.

5. 2‑in‑1 Workover + Drilling Solution

Best for: Cluster pads requiring both new well drilling and ongoing well servicing. XJ450, XJ550, XJ650, XJ750 and XJ850 with rotary table, swivel and drilling tools. XJ650 drilling depth reaches 2,000 m (3-1/2″ DP). Eliminates the need for a separate drilling spread on the pad.

6. Arctic‑Rated Workover Solution

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, insulated hydraulic lines, heated control cabins. Proven in Russia.

7. Integrated Wellhead Control Solution (WHCP + SCADA)

Best for: Operators who already have a workover rig but need to add smart wellhead automation. Includes WHCP with RTU/PLC, high‑accuracy sensors, fail‑safe actuators (hydraulic/pneumatic/electric), local HMI, SCADA software, communication equipment (4G/5G, satellite, radio) and training. Compatible with any API 6A wellhead.

8. Downhole Tool Package (Fishing, Milling, Isolation)

Best for: Operators who need a comprehensive tool suite for fishing, milling and zone isolation. Includes overshots (releasing and circulating), fishing spears (releasing), die collars, junk baskets, magnetic fishing tools, lead impression blocks, flat bottom mills, tapered junk mills, bladed junk mills, section mills, bridge plugs (API 11D1 V3 certified), cement retainers and retrievable packers.

Why Choose SJ Petro for Your Workover Solutions?

Because a workover solution is not a commodity. It is an integrated investment in production uptime, crew safety and regulatory compliance. You need a manufacturer who designs, builds, certifies and supports every component – not a trading company that assembles parts from others.

Your Workover Challenge	SJ Petro’s Solution
"I need API certification for an international tender.”	Full API 4F, 7K, 8C compliance. Authorised to use API monogram. Complete certification packages – MTRs, hydrostatic certificates, NDT reports, API data sheets, as‑built drawings.
"I operate in extreme environments – arctic or desert.”	Arctic and desert packages available. SJ Petro has delivered ZJ40 cold‑weather rigs to Orenburg Drilling Company in Russia. XJ650 rigs are field‑proven across South America, Western Africa and the Middle East.
"I need one rig that can do both workover and drilling.”	XJ450, XJ550, XJ650, XJ750 and XJ850 are true 2‑in‑1 rigs. XJ650 drilling depth reaches 2,000 m (3-1/2″ DP).
"I need reliable power components with global parts availability.”	Caterpillar engines + Allison transmissions – industry standard, parts available in every major oilfield worldwide.
"I need an integrated wellhead control system with SCADA.”	We supply WHCP with RTU/PLC, fail‑safe ESD, sensors, actuators and SCADA software – all compatible with your workover rig.
"I need downhole fishing and milling tools that match my rig.”	Through SJS Ltd., we supply API 11D1 certified bridge plugs, overshots, fishing spears, taper mills and junk baskets – designed to work seamlessly with SJ Petro rigs.

More reasons to trust SJ Petro:

• Sinopec Group heritage – founded in 1941, over 80 years of oilfield equipment engineering

• 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

• In‑house manufacturing – annual production capacity: 100 workover rigs, 100 drilling rigs, 120 cementing units, 80 fracturing units, over 700 pumps, 150,000 high‑pressure manifolds

• 50,000 m² assembly yard – 24 rig‑up positions, 12 drilling or workover rigs can be assembled and commissioned simultaneously

• API 4F, 7K, 8C certified – full international certification, not "designed to” claims

• ISO 9001 and HSE certified – DNV certification since 1999, API 11D1 certification since 2005 for downhole oil tools

• Global track record – workover solutions delivered to South America, Western Africa, Middle East, United States, Indonesia, Russia and beyond. XJ650 rig is highly popular among users across South America, Western Africa and the Middle East

• Full documentation – material test reports (EN 10204 3.1), structural calculations, load test certificates, as‑built drawings, API data sheets

• Flexible commercial terms – milestone payments (30/40/30), operating leases and direct financing available for qualified buyers

Frequently Asked Questions (FAQ) – Workover Solutions

Q1: What does a "complete workover solution” include from SJ Petro?

A: A complete workover solution includes:

• XJ series self‑propelled workover rig (model selected by target depth, with Caterpillar + Allison drivetrain)

• Full downhole tool package – fishing tools (overshots, spears, junk baskets, magnetic tools), milling tools (flat bottom, tapered, bladed, section mills), isolation tools (bridge plugs API 11D1 V3 certified, cement retainers, retrievable packers)

• Wellhead automation – WHCP with RTU/PLC, fail‑safe ESD, sensors, actuators, SCADA software

• On‑site commissioning – installation supervision and system validation

• Operator training – 1–2 weeks of hands‑on instruction

• Spare parts kit – tailored to your expected operating hours

• Remote support – 6 months of video call diagnostics

One purchase order, one warranty, one point of contact.

Q2: What workover depths can your solutions reach for different pipe sizes?

A: Our XJ series covers the full depth spectrum:

Model	2-7/8″ DP	3-1/2″ DP	4-1/2″ DP
XJ250	3,200 m	—	—
XJ350	3,200 m	2,500 m	—
XJ450	4,500 m	3,500 m	—
XJ550	5,800 m	4,500 m	3,600 m
XJ650	7,000 m	5,500 m	4,200 m
XJ750	8,000 m	6,500 m	5,000 m
XJ1200	9,000 m	7,500 m	6,000 m

Maximum hook load ranges from 300 kN to 2,250 kN (67,440–505,800 lbs).

Q3: Are your workover solutions API certified?

A: Yes. Our XJ series rigs are designed, manufactured and tested in accordance with API Spec Q1, 4F, 7K, 8C and relevant standards of RP500, GB3826.1, GB3836.2, GB7258, SY5202 as well as "3C” compulsory standard. Our downhole tools are API 11D1 V3 certified. Our wellhead control panels comply with API 14A, API RP 14B and API RP 14C safety standards. We are authorised to use API monogram on products under these specifications.

Q4: Can your workover solutions include both the rig and the wellhead control system?

A: Yes. We provide WHCPs as an integrated part of our workover solutions. The WHCP includes RTU/PLC, fail‑safe ESD logic, sensors, actuators (hydraulic, pneumatic or electric) and SCADA software. The control system can be retrofitted to existing wells or integrated with new wellhead equipment.

Q5: Can your workover solutions be used for drilling operations?

A: Yes. XJ450, XJ550, XJ650, XJ750 and XJ850 are true 2‑in‑1 machines. Equipped with a rotary table, swivel and drilling tools, they can drill medium and shallow wells while also performing workover operations. The XJ650 drilling depth reaches 2,000 m (3-1/2″ DP).

Q6: What downhole tools do you supply as part of the workover solution?

A: Through our subsidiary SJS Ltd. (API 11D1 certified), we supply:

• Fishing tools – releasing and circulating overshots, releasing fishing spears, die collars, junk baskets, strong magnetic fishing tools, lead impression blocks

• Milling tools – flat bottom mills, tapered junk mills, bladed junk mills, section mills, conical mills, pilot mills

• Isolation tools – SHMB drillable bridge plugs, cement retainers, retrievable packers

• Downhole accessories – bumper jars, hydraulic jars, safety joints, circulation subs

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.

Q7: Can your workover solutions operate in extreme cold (-45 °C) or extreme heat (55 °C+)?

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

• Arctic package (-45 °C) – low‑temperature materials, low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems, insulated hydraulic lines, heated control cabins. SJ Petro has delivered ZJ40 cold‑weather drilling rigs to Orenburg Drilling Company in Russia.

• Desert package (55 °C+) – oversized cooling systems (radiators and heat exchangers), sand‑sealed electrical enclosures, dust filtration, corrosion‑resistant coatings, reinforced chassis.

Q8: What is the lead time for a complete workover solution?

A: Standard lead times from order confirmation:

• XJ250–XJ350 (standard workover solution): 4–5 months

• XJ450–XJ550 (standard workover solution): 5–6 months

• XJ650–XJ1200 (standard workover solution): 6–8 months

• 2‑in‑1 workover + drilling solution: 8–10 months

• Full integrated solution (rig + WHCP + downhole tools + training): add 2–3 months for coordination and documentation

• Custom builds (arctic, desert, special requirements): 8–10 months

Expedited delivery may be available – contact our sales team.

Q9: What is the warranty on a workover solution?

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, WHCP). Wear parts (brake bands, seals, filters) are not covered but are available as spares. Extended warranty (up to 5 years) is available for an additional fee.