Offshore workover solutions
Technical Specifications
SJ Complete Workover Rigs Product Line — Full Technical Reference
SJ can offer a complete line of workover rigs, with max. hook load ranging from 585 kN to 2,250 kN, max. workover depth up to 9,000 m (2-7/8” DP), and max. installed power of 1,260 HP. Customers can choose diesel engine or electric motor drive systems. Single drum, double drum, and electric drive single-shaft drawworks are all available.
| Model | Workover Depth (2-7/8” DP, m) | Workover Depth (3½” DP, m) | Nominal Hook Load (kN) | Max. Static Load (kN) | Drawworks HP | Wireline Dia. (mm) | Traveling System |
|---|---|---|---|---|---|---|---|
| XJ250 | 2,000 | — | 400 | 675 | 250 | φ22 | 3×4 |
| XJ350 | 3,200 | 2,500 | 600 | 900 | 350 | φ26 | 3×4 |
| XJ450 | 4,500 | 3,500 | 800 | 1,125 | 450 | φ26 | 4×5 |
| XJ550 | 5,800 | 4,500 | 1,000 | 1,350 | 550 | φ26 | 4×5 |
| XJ650 | 7,000 | 5,500 | 1,200 | 1,470 | 650 | φ29 | 4×5 |
| XJ1000 | 8,000 | 6,500 | 1,500 | 1,800 | 750 | φ29 | 5×6 |
| XJ1200 | 9,000 | 7,500 | 1,800 | 2,250 | 1,000 | φ32 | 5×6 |
SHXJ Series Offshore Workover Rigs — Fixed Platform Applications
| Model | Max Hook Load (kN / lb) | Drawworks Power (kW / hp) | Platform Type |
|---|---|---|---|
| SHXJ90 | 900 / 200,000 | 257–330 | Fixed platform |
| SHXJ112 | 1,125 / 250,000 | 280–400 | Fixed platform |
| SHXJ135 | 1,350 / 300,000 | 330–450 | Fixed platform |
| SHXJ158 | 1,575 / 350,000 | 400–500 | Fixed platform |
| SHXJ180 | 1,800 / 400,000 | 450–600 | Fixed platform |
| SHXJ225 | 2,250 / 550,000 | 550–735 | Fixed platform |
HXJ158 Offshore Workover Rig — Detailed Technical Specifications
| Parameter | Value |
|---|---|
| Max. Hook Load | 346,500 lb (1,580 kN) |
| Drawworks Installed Power Rating | 360 HP × 2 sets (269 kW × 2 sets) |
| Workover Depth (3½” drilling pipe) | 18,040 ft (5,500 m) |
| Drilling Depth (4½” drilling pipe) | 8,200 ft (2,500 m) |
| Mast Clearance Height | 95 / 108 ft (29 / 33 m) |
| Effective Number of Lines | 8 |
| Drawworks Rated Power | 737 hp (550 kW) |
| Base Movement | Hydraulic driving — transverse and longitudinal |
| Rotary Table | Forward/reverse gear mechanisms with anti-reversing unit |
| Brake System | Band brake with forced circulation cooling; auxiliary air control water cooling disc brake |
| Control System | Centralized long-distance air control with multiple protection functions |
SJK Series Jack-Up Platform Workover Packages
| Model | Max Hook Load (kN / lb) | Drawworks Power (kW / hp) | Platform Type |
|---|---|---|---|
| SJK450DB | 4,500 / 1,000,000 | 1,470 / 2,000 | Jack-up platform |
| SJK675DB | 6,750 / 1,500,000 | 2,200 / 3,000 | Jack-up platform |
| SJK900DB | 9,000 / 2,000,000 | 4,413 / 6,000 | Jack-up platform |
2,250 kN Offshore Hydraulic Workover Unit
| Parameter | Value |
|---|---|
| Maximum Lifting Load | 2,250 kN |
| Maximum Downward Load | 1,100 kN |
| Maximum Rotational Torque | 13.5 kN·m |
| Pipe Handling Range | 2³⁄₈″ ~ 9⁵⁄₈″ |
| Lifting Cylinder Stroke | 3.05 m |
| Cylinder Operating Mode | 2-cylinder or 4-cylinder convertible |
| Rated Working Pressure | 10,000 psi |
| Application | Live-well interventions, snubbing, acidizing, fracturing, sand washing, fishing |
High-Pressure Fluid Control Products
Our Manifold Branch can provide high-pressure manifolds which are interchangeable with world-leading manifolds, including various high-pressure fluid control products with pressure ratings ranging from 21 MPa to 140 MPa and sizes from 2” to 5”. Nearly 20 types of equipment from well control systems and high-pressure manifolds to specialized valves are available for integrated offshore workover packages.
Drilling Rig Capability (for Dual-Purpose HXJ Units)
For reference, SJ can produce drilling rigs with drilling depth ranging from 1,000 m to 9,000 m, suitable for single or cluster well drilling operations in land, offshore, and special areas such as mountainous terrain, marshes, deserts, tidal flats, and extremely cold regions. SJPETRO drilling rigs are awarded as one of China Top Brand, covering truck-mounted, trailer-mounted, modularized, fast-move, and special drilling rigs, powered by diesel engines, electric motors, or combined power packs.
Applications — Where SJ Offshore Workover Equipment Excels
| Application | Environment | Recommended Equipment |
|---|---|---|
| Fixed platform production well servicing & workover | Fixed platforms in mature offshore fields | SHXJ series (90–225 models); modular skid-mounted configuration |
| Cluster well workover on multi-well platforms | Platforms with multiple wellheads in tight spacing | HXJ series with hydraulic lateral/longitudinal walking base |
| Jack-up platform workover & subsea intervention | Jack-up rigs, shallow to moderate water depth | SJK series packages with full cantilever capability |
| Drill-workover dual-purpose operations | Platforms requiring both workover and shallow drilling | HXJ dual-purpose units (HXJ135 through HXJ315) |
| Offshore hydraulic well intervention | Live-well operations, HPHT completions | 2,250 kN hydraulic workover unit with automated control |
| Well abandonment and decommissioning | Mature offshore fields, end-of-life wells | High-capacity workover units (2,250 kN class) |
| Sand control & gravel pack workover | Unconsolidated sandstone reservoirs | SHXJ or HXJ series with integrated sand control systems |
| Fishing operations — tool & pipe recovery | Deep wells, HPHT completions | HXJ series with high-torque rotary systems and anti-reverse protection |
| Acidizing and stimulation workover | Carbonate reservoirs, production enhancement | Hydraulic workover unit or HXJ series with high-pressure pumping integration |
| Snubbing and live-well interventions | Wells requiring underbalanced operations | 2,250 kN hydraulic workover unit for snubbing and completion |
| Cased hole drilling and plug & abandonment | Well isolation, tubular recovery | HXJ dual-purpose rigs with rotary table capability |
For operators managing mature offshore assets — where workover interventions are routine rather than exceptional — SJ's offshore workover solutions deliver the reliability and efficiency you need to maximize uptime and minimize deferred production.
A jack-up rig can only be used alongside a platform if water depth conditions are suitable and seabed conditions permit. SJ’s fixed platform workover equipment eliminates dependency on rig availability for routine well servicing.
Product Portfolio — Complete Offshore Workover Equipment Range
SJ manufactures and supplies the following categories of offshore workover equipment:
| Category | Key Products | Typical Applications |
|---|---|---|
| Fixed Platform Workover Rigs | SHXJ90, SHXJ112, SHXJ135, SHXJ158, SHXJ180, SHXJ225 | Routine and complex workover operations on fixed production platforms |
| Drill-Workover Dual-Purpose Rigs | HXJ90, HXJ135, HXJ158, HXJ180, HXJ225, HXJ315 | Workover + shallow drilling in one unit; reduces capital and operating costs |
| Jack-Up Platform Workover Packages | SJK450DB, SJK675DB, SJK900DB | Heavy-lift workover operations on jack-up rigs with subsea interfaces |
| Hydraulic Workover Units | 2,250 kN class hydraulic workover unit | Live-well interventions, snubbing, underbalanced operations |
| Drilling Rigs (for hybrid applications) | ZJ30–ZJ90 series (1,000–9,000 m depth) | New well drilling on platforms; cluster well operations |
| Self-Propelled Workover Rigs | XJ250–XJ1200 series (land-based, deployable to offshore) | Mobile workover for platforms with deck access |
| High-Pressure Fluid Control Products | Choke and kill manifolds (21–140 MPa), valves, well control equipment | Well control, flow management, HPHT operations |
| Mud Pumps and Circulation Equipment | F-800 to F-2200 series mud pumps, mud purification systems | Drilling fluid circulation for workover and drilling operations |
| Hoisting Equipment | Crown blocks, traveling blocks, hooks, swivels, rotary tables | API 8C certified; full load range coverage |
| Offshore Drilling and Production Units | Complete platform drilling packages | Integrated platform drilling and workover solutions |
Why Choose SJ Petroleum Machinery for Your Offshore Workover Needs?
1. Sinopec-Grade Quality — Built to the Same Standards as a National Oil Company
As a Sinopec subsidiary, we operate under the same quality management protocols that govern one of the world's largest integrated energy companies. Our API Q1, ISO 9001, and HSE management system certifications aren’t just paperwork — they're the daily operating standards across our entire facility. When you buy from SJ, you’re buying equipment that has already passed the most rigorous internal quality inspections in China's oil industry.
2. Vertically Integrated Manufacturing — Full Quality Control
From casting and forging to machining, assembly, and final commissioning — we do it in-house. We have established seven dedicated production lines (drawworks, gear boxes, cylinders, masts, high-pressure manifolds, plunger pumps, and post-treatment) and three assembly lines (drilling rigs, workover rigs, and cementing/fracturing equipment). Our "multi-layer filtration” quality inspection system ensures that only API-compliant equipment leaves our factory floor.
3. Complete Integrated Offshore Workover Packages — One Partner, One Responsibility
You don’t need to manage five different vendors for the rig, the mud pumps, the BOPs, and the control system. SJ provides integrated offshore workover packages — from the drawworks and mast to the high-pressure manifolds and control cabin — all designed, manufactured, and tested under one roof. One point of contact. One warranty. One team that knows the entire system.
4. 50,000 m² Assembly Yard with Offshore Commissioning Sites
We possess a rig assembly yard covering an area of 50,000 square meters, with 24 positions for rigging-up and two dedicated offshore rig commissioning sites (four rig positions), where a test of 750 tons can be performed and 12 drilling or workover rigs can be assembled and commissioned simultaneously. Before any offshore workover unit leaves our facility, it undergoes full factory acceptance testing (FAT) in a configuration that closely mimics actual platform conditions.
5. Customer-Witnessed Testing and Third-Party Inspection Welcome
Our manufacturing process can be supervised by customers and inspected by any third-party certification agency you choose — DNV, ABS, Lloyd's, or any other accredited inspector. We provide full traceability documentation for every certified component and regularly welcome customer representatives to our facility for witness testing.
6. Global After-Sales Support — Parts and Service Where You Need Them
We maintain regional service centers and parts warehouses in key offshore hubs (contact our sales team for current locations). Our field service teams have extensive experience with platform logistics — working within crane schedules, coordinating with platform management, and performing maintenance without disrupting production. We offer on-site commissioning, operator training, preventive maintenance programs, and emergency field service available 24/7.
7. Proven Track Record Across Asia’s Most Demanding Offshore Fields
SJ's offshore workover equipment has been deployed on fixed platforms and jack-up rigs across the South China Sea, East China Sea, and Southeast Asia. Our hydraulic workover unit has been field-validated for nearly 100 well interventions on four platforms. This isn’t prototype technology — it's production-proven equipment operating in some of the most challenging marine environments on the planet.
8. Over 70 Years of Manufacturing Heritage
From our founding in 1941 to the present day, SJ has delivered more drilling and workover rigs to more oilfields than any other Chinese manufacturer. We are consistently the #1 exporter of drilling and workover equipment from China, with a cumulative installation base measured in the thousands of units worldwide.
9. In-House R&D Power — 314 Engineers and a Post-Doctoral Research Station
Our technical center employs 314 dedicated engineers and researchers, with full capabilities for product development, process research, and customization engineering. We are authorized to set up a post-doctoral research station and operate a complete CAD/CAPP/PDM/ERP industrial information system. This means when you have a unique platform constraint or a specialized operational requirement, we have the engineering depth to solve it — not just sell you a standard product.
10. AAA Credit Rating and Financial Stability
As a state-owned Sinopec enterprise with AAA credit ratings from both China's petrochemical industry and major banks, SJ offers the financial stability that private manufacturers cannot match. You can count on us to be here for the long haul — for warranty support, for spare parts, and for your next project.
Frequently Asked Questions (FAQ)
Q1: What certifications does SJ hold for offshore workover equipment?
SJ holds API Spec Q1, 4F, 7K, 8C, 6A, and 16C monogram licenses covering all relevant workover equipment categories. API Spec 4F covers drilling and workover structures including derricks, masts, and substructures. API Spec 8C covers hoisting equipment including traveling blocks, swivels, hooks, elevators, and hoisting accessories. We also maintain ISO 9001 and HSE management system certifications, ABS works approval, CE marking, and CU-TR (GOST) certification for exports to regulated markets.
Q2: Do you customize offshore workover rigs for specific platform layouts?
Absolutely — and we strongly encourage it. Every offshore platform has unique constraints: crane lift capacities, deck space limitations, wellhead spacing, and existing infrastructure interfaces. SJ works directly with your platform engineering team to customize module weights, base configurations, mast heights, and control system interfaces for seamless integration. No two platforms are the same, and no two of our offshore rigs are identical.
Q3: What is the typical lead time for an SHXJ series offshore workover rig?
Lead times vary based on customization level and capacity requirements, typically ranging from 8 to 12 months from order confirmation to factory acceptance testing (FAT). For standard SHXJ models with minimal customization, we can often expedite to 6–8 months. Contact our international sales team for current delivery schedules.
Q4: Do you provide on-site commissioning and operator training?
Yes. Every offshore workover unit we ship includes factory acceptance testing at our 50,000 m² assembly yard, followed by on-site commissioning by our field service engineers once the equipment arrives on your platform. We also provide comprehensive operator and maintenance training — available at our training facility in Jingzhou or on-site at your platform — to ensure your crew is fully prepared for offshore operations.
Q5: What about spare parts availability for offshore locations?
SJ maintains regional spare parts inventory in strategic locations including Dubai (Middle East), Singapore (Southeast Asia), and Houston (Americas), with express delivery to most major offshore hubs within 48–72 hours. For critical components, we can establish consignment inventory at your location. Our 24/7 remote support desk is staffed by experienced field engineers familiar with offshore workover equipment.
Q6: Can I visit your factory and witness FAT for my equipment?
Yes — and we strongly encourage it. We regularly host customers and third-party inspectors at our 50,000 m² assembly yard in Jingzhou for witness testing and FAT. We also invite you to visit our two dedicated offshore commissioning sites, where we simulate platform conditions during final testing with full 750-ton load testing capability.
Q7: How does SJ compare to other offshore workover equipment manufacturers?
As a Sinopec subsidiary with over 70 years of history, SJ offers the unique combination of state-owned enterprise quality controls, financial stability, and proven offshore track record. Unlike smaller manufacturers, we maintain a dedicated R&D team of 314 engineers — many with specific expertise in offshore and marine applications. Our in-house manufacturing (casting, forging, machining, assembly, and testing) gives us full quality control, and our API-certified product range covers all major workover equipment categories. Most importantly, our equipment has been proven on actual platforms — not just in factory brochures.
Q8: Can an HXJ series rig handle both workover and new drilling operations?
Yes. The HXJ series is specifically designed as a drill-workover dual-purpose rig. When equipped with a rotary table, swivel, and drilling tools, it can perform as a mobile drilling rig for shallow and medium-depth wells — eliminating the need for a separate drilling rig on your platform. The HXJ158, for example, offers 5,500 m workover depth with 3½” drill pipe and 2,500 m drilling depth with 4½” drill pipe.
Q9: What is the maximum water depth your hydraulic workover unit can handle?
Our 2,250 kN offshore hydraulic workover unit has been successfully deployed on platforms in water depths exceeding 100 meters. For deeper applications and subsea well interventions, we offer customized configurations designed to interface with subsea trees and riser systems. Contact our engineering team with your specific depth and well configuration requirements for a detailed technical proposal.
Q10: What are the delivery options for international customers?
SJ has extensive experience exporting to customers in over 50 countries worldwide. We handle all aspects of international shipping including sea freight (EXW, FOB Shanghai/Guangzhou, CIF, and CFR terms available), customs clearance documentation, marine insurance, and platform lift coordination for direct delivery to your facility or offshore location. Our logistics team works directly with your platform operator to ensure smooth delivery and rig-up with minimal platform downtime.
Q11: Do you offer financing or leasing options?
Yes. As a Sinopec subsidiary with AAA credit ratings from China's petrochemical industry and major banks, SJ can support a range of procurement models including direct purchase, lease-to-own, and operating lease arrangements for qualified customers. Discuss your project financing needs with our sales team.
Q12: How does SJ ensure product quality for offshore environments?
Our "multi-layer filtration” quality inspection system covers every stage of manufacturing from incoming material inspection through in-process checks, assembly testing, and third-party supervision. All SJ offshore workover equipment is manufactured to API standards with corrosion-resistant materials (stainless steel piping and fittings throughout), explosion-proof electrical systems (Exd II BT5/Exd II BT6 with IP55 protection), and high wind load capacity (55 m/s+ wind resistance). Our dedicated offshore commissioning sites allow us to perform full load testing up to 750 tons in a platform-simulated environment before any equipment ships.
Q13: What is the global workover rigs market outlook?
The global workover rigs market size was valued at approximately USD 920.17 million in 2024 and is predicted to grow to around USD 1,786.46 million by 2034, with a compound annual growth rate (CAGR) of roughly 7.65% between 2025 and 2034. The market is experiencing growth driven by increasing demand for well intervention and maintenance activities in mature oil and gas fields, with offshore workover operations presenting unique challenges requiring specialized rigs and expertise.
