Offshore Workover Rig
Technical Specifications – XJ Series Offshore Workover Rigs
The XJ series covers the full workover depth spectrum from 1,000 m to 9,000 m. The following specifications apply to the core XJ series platform, which forms the basis of our offshore workover rigs. For platform‑specific modifications (marine coatings, explosion‑proofing, heave compensation), please contact our offshore engineering team.
XJ Series – Offshore Workover Rig Core Specifications
| Model | Workover Depth (2-7/8″ DP) | Nominal Hook Load | Max Static Hook Load | Drawworks HP | Engine (Typical) | Transmission |
|---|---|---|---|---|---|---|
| XJ250 | 3,200 m / 10,500 ft | 400 kN (90,000 lbf) | 735 kN (165,000 lbf) | 250 HP | Caterpillar C9 / 350 HP | Allison 4700 OFS |
| XJ350 | 3,200 m / 10,500 ft | 600 kN (134,900 lbf) | 900 kN (202,330 lbf) | 350 HP | Caterpillar C9 / Detroit S60 | Allison 4700 OFS / M5610s |
| XJ450 | 4,500 m / 14,760 ft | 800 kN (179,800 lbf) | 1,125 kN (252,900 lbf) | 450 HP | Caterpillar C13 / 440 HP | Allison 4700 OFS |
| XJ550 | 5,800 m / 19,000 ft | 1,000 kN (224,800 lbf) | 1,350 kN (303,000 lbf) | 550 HP | Caterpillar C15 / 475 HP | Allison M5610AR |
| XJ650 | 7,000 m / 23,000 ft | 1,200 kN (269,800 lbf) | 1,580 kN (355,200 lbf) | 650 HP | Caterpillar C18 / 630 HP | Allison S6610RH |
| XJ1000 | 8,000 m / 26,200 ft | 1,500 kN (337,200 lbf) | 1,800 kN (404,700 lbf) | 750 HP | 1,000 HP class | Allison |
| XJ1200 | 9,000 m / 29,500 ft | 1,800 kN (404,600 lbf) | 2,250 kN (505,800 lbf) | 1,000 HP | 1,000+ HP (dual engine) | Dual Allison |
XJ650 – Detailed Offshore Configuration Example
The XJ650 is the bestselling heavy‑duty workover rig of SJ Petro. Equipped with a powerful Cat C18 engine, the XJ650 can serve as a 2‑in‑1 rig to perform both workover and drilling operations. This rig is renowned for powerful capability, stable performance and great mobility by users in 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″) |
| Travelling system | 4×5 |
| Mast clearance height | 35 m (115 ft) |
| Platform footprint (approximate) | 15 m × 10 m (depending on module layout) |
| Total weight (platform configuration) | 55,000 kg (121,250 lb) |
| Air assist brake system | KOBELT Disc with matched caliper |
Key Platform Interface Parameters
| Parameter | Requirement / Specification |
|---|---|
| Power supply | Rig‑integrated diesel (enclosure available) or platform grid (electric drive option) |
| Platform crane capacity (minimum) | 10 t for module lifts (varies by module size – please consult for specific modules) |
| Hydraulic power unit | Skid‑mounted, located at operator’s choice on deck |
| Control cabin | Skid‑mounted, positioned for mast visibility, climate‑controlled |
| ESD interface | Hardwired shutdown signals (dry contacts) to platform ESD system |
| Coating standard | Offshore epoxy with polyurethane topcoat, colour to customer specification |
Applications – Where Our Offshore Workover Rigs Are Used
Our XJ series offshore workover rigs are deployed across a range of marine environments:
-
Fixed production platforms – Permanent platform installation for ongoing workover campaigns. Modular design allows staged transport and assembly with platform cranes. Compact footprint respects deck space limitations.
-
Jack‑up drilling rigs – Workover and light drilling from cantilevered jack‑ups. The rig is disassembled into transport‑friendly modules and reassembled on the jack‑up deck.
-
Floating platforms (semi‑submersibles) – Heave compensation package available; modular design fits within semi‑submersible deck space; ESD/EQD integration with vessel safety systems.
-
Artificial islands – Near‑shore cluster well development. The same rig can walk between wellheads using our optional inter‑well moving systems.
-
Offshore workover campaigns – Deep‑well intervention (up to 9,000 m), fishing operations, milling, zone isolation and plug‑back.
-
Well abandonment – Permanent plugging of depleted offshore wells.
-
Subsea wellhead intervention – For subsea tieback wells, the rig can be configured to work through a surface BOP stack with subsea interface.
Product Types – Offshore Workover Rig Configurations
We offer the XJ series in offshore configurations, with additional platform‑specific features available.
1. Fixed‑Platform Workover Rig
Best for: Permanent installation on steel jacket or concrete gravity platforms.
Includes: XJ250 through XJ1200, selected by workover depth. Modules dimensioned for platform crane capacity. Marine coatings (epoxy + polyurethane). Sealed electrical enclosures (IP66). Platform ESD integration.
2. Jack‑Up Workover Rig
Best for: Cantilevered operations from independent leg jack‑up units.
Includes: Same as fixed‑platform configuration, plus design for jack‑up deck layout and weight distribution. Modules sized for jack‑up crane lifts. Optional skidding base for lateral movement along the cantilever.
3. Semi‑Submersible / Floating Vessel Workover Rig
Best for: Deepwater well intervention from semi‑submersibles and drillships.
Includes: All standard features plus hydraulic heave compensation system (maintains constant weight on bit). Emergency Quick Disconnect (EQD) for workover riser. Enhanced dynamic positioning interface. Marine riser tensioner integration.
4. 2‑in‑1 Offshore Workover & Drilling Rig
Best for: Platform‑based infill drilling and side‑tracks in addition to workover.
Includes: XJ550, XJ650, XJ1000 or XJ1200 with rotary table, swivel and drilling line. Capable of drilling to 2,000 m (6,560 ft) with 3-1/2″ DP. Saves the cost of a separate platform drilling rig.
5. Subsea Workover Rig Configuration
Best for: Workover on subsea tieback wells (surface BOP system). Uses an open‑water riser system with subsea test tree and surface BOP stack.
6. Arctic Offshore Workover Rig
Best for: Platforms in high‑latitude regions (North Sea, Sakhalin, Canadian East Coast).
Includes: Extended operating temperature range to -45 °C. Low‑temperature hydraulic fluids, insulated enclosures, battery warmers, heated air intakes. Marine coatings rated for ice abrasion.
7. Retrofit Offshore Workover Rig Package
Best for: Operators with an existing XJ series land rig who want to convert it for offshore platform use.
Includes: Marine coating application, sealed electrical upgrades, explosion‑proofing, platform ESD integration, optional heave compensation or EQD. Platform installation supervision and recertification documentation.
Why Choose SJ Petro for Your Offshore Workover Rig?
Because an offshore workover rig is a major capital investment. You need a manufacturer who has proven its equipment in the marine environment and can deliver the certification your project requires.
| Your Offshore Challenge | SJ Petro’s Answer |
|---|---|
| "I need API certification for an offshore tender.” | Full API 4F, 7K, 8C compliance. API monogram available. Complete certification packages for third‑party review. |
| "My platform crane capacity is limited. How will we install the rig?” | Modular design – each module sized to fit within typical platform crane limits. We provide lift plans for each module. |
| "We operate in a high‑corrosion environment. How long will the equipment last?” | Marine‑grade coatings, stainless steel instrument enclosures, sealed electrical systems. Proven in Bohai Bay for decades. |
| "We need to move the rig between platforms occasionally.” | Modular design allows disassembly, barge transport and reassembly on another platform – no permanent platform modification required. |
| "Our semi‑submersible heaves in heavy weather.” | Heave compensation system maintains constant hook load. Emergency Quick Disconnect (EQD) for riser safety. |
| "Our safety system requires integration with platform ESD.” | Hardwired ESD interfaces, fail‑safe valves, redundant shutdown circuits. Design follows API RP 14C principles. |
More reasons to trust SJ Petro:
-
Sinopec Group heritage – Founded in 1941, over 80 years of oilfield equipment engineering
-
Offshore experience since 1993 – First offshore drilling and workover rigs delivered to Bohai Bay in 1998, awarded national technology innovation excellence
-
In‑house manufacturing – Annual production capacity: 100 workover rigs, 100 drilling rigs, 120 cementing units, 80 fracturing units
-
API 4F, 7K, 8C certified – Authorised to use API monogram on products under these specifications
-
Global track record – Offshore workover equipment delivered to Bohai Bay (China), Southeast Asia, Middle East, Western Africa
-
Full documentation – Material test reports (EN 10204 3.1), load test certificates, API data sheets, as‑built drawings
-
Flexible commercial terms – Milestone payments (30/40/30), operating leases and direct financing available for qualified buyers
Frequently Asked Questions (FAQ) – Offshore Workover Rig
Q1: How is an offshore workover rig different from a land workover rig?
A: Offshore workover rigs are designed for the marine environment. Key differences include:
-
Compact, modular design – sized for platform deck space and crane capacity
-
Marine corrosion protection – epoxy/polyurethane coatings, stainless steel components, sealed electrical enclosures (IP66)
-
Safety systems integration – ESD, PSD and EQD interfaces with platform safety systems (SIL‑2 ready)
-
Heave compensation – for floating vessels and semi‑submersibles
-
Marine certification – DNV, ABS, Lloyds, BV available on request
-
No permanent platform modification – modules bolt or pin together, can be removed and relocated
Q2: What workover depths can your offshore XJ series rigs reach?
A: Our XJ series covers depths from 1,000 m to 9,000 m (3,280 ft – 29,500 ft):
| Model | Workover Depth (2-7/8″ DP) | Drilling Depth (3-1/2″ DP) |
|---|---|---|
| XJ250 | 3,200 m (10,500 ft) | — |
| XJ350 | 3,200 m (10,500 ft) | — |
| XJ450 | 4,500 m (14,760 ft) | 1,500 m |
| XJ550 | 5,800 m (19,000 ft) | 2,000 m |
| XJ650 | 7,000 m (23,000 ft) | 2,000 m |
| 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 offshore workover rigs API certified?
A: Yes. Our XJ series is designed, manufactured and tested in accordance with API Spec Q1, 4F, 7K and 8C. We are authorised to use API monogram on products under these specifications. For international tenders, we provide complete certification packages including material test reports (EN 10204 3.1), hydrostatic certificates, NDT reports, API data sheets and as‑built drawings. Third‑party witness testing (SGS, BV, DNV, ABS, Lloyds) is available upon request.
Q4: Can you provide DNV or ABS certification for offshore workover rigs?
A: Yes. For offshore installations requiring classification society certification, we can supply rigs with DNV, ABS, Lloyds or Bureau Veritas certification. This requires additional engineering review, documentation and third‑party witness testing. Lead times are extended accordingly.
Q5: What heave compensation options are available for floating platforms?
A: For semi‑submersibles and drillships, we offer a hydraulic heave compensation system that maintains constant hook load despite vessel motion. The system uses passive or active compensation cylinders integrated with the drawworks control system. A Emergency Quick Disconnect (EQD) system is also available, allowing rapid disconnection of the workover riser in emergency conditions.
Q6: How is the rig transported to the offshore platform?
A: The rig is disassembled into modules that fit within platform crane lifting capacity (typically 10 t modules, but we can adjust for your specific crane rating). Modules are transported to the platform by supply vessel or barge, then lifted onto the platform deck using the platform’s existing cranes. Bolted and pinned connections allow assembly without welding or permanent platform modifications.
Q7: What is included in the platform installation and training package?
A: For every offshore workover rig purchase, we include:
-
On‑site installation supervision – Our engineers oversee module placement and assembly
-
System commissioning – Function testing, ESD verification, load testing
-
Operator training – 1–2 weeks on the platform, covering rig operation, safety systems, emergency procedures
-
Maintenance training – Preventive maintenance schedules, inspection checklists, troubleshooting guides
-
Digital documentation – Manuals, video tutorials, remote support for 6 months
Q8: What is the warranty on an offshore workover rig?
A: 12 months after commissioning or 18 months after shipment – whichever occurs first. The warranty covers manufacturing defects on all components (hydraulic system, drawworks, mast, control system). Wear parts are not covered but are available as spares. Extended warranty (up to 5 years) is available for an additional fee.
Q9: Do you provide financing or leasing for offshore 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 offshore sales team for a lease proposal.
