Offshore workover services
Innovation & Technology Advantages — Engineered for the Marine Environment
1. SHXJ Series: Fixed-Platform Workover That Actually Fits
Our SHXJ series offshore workover rigs are designed specifically for fixed production platforms, where deck space is at a premium and crane capacity is limited. The SHXJ range covers maximum hook loads from 900 kN to 2,250 kN and drawworks power from 257 to 735 hp, with six standard models: SHXJ90, SHXJ112, SHXJ135, SHXJ158, SHXJ180, and SHXJ225.
Each unit features a modular skid-mounted structure with upper and lower bases, driven hydraulically for both lateral and longitudinal movement — enabling efficient cluster well workover operations without repositioning the entire rig. The hydraulic walking system means you can service multiple wellheads from a single setup. That's hours saved per job, multiplied across an entire field development.
2. HXJ Series: Drill-Workover Dual-Purpose Versatility
The HXJ series offshore workover rigs (HXJ90, HXJ135, HXJ180, and higher models) offer true dual-purpose capability — perform production workover operations and, when needed, handle shallow drilling and side-tracking jobs without bringing in a separate drilling rig. The HXJ90, for example, delivers a maximum hook load of 900 kN (198,000 lb) with a drawworks power of 269 kW (360 hp), a workover depth of 2,500 m using 3½＂ drill pipe, and a drilling depth of 1,000 m using 4½＂ pipe.
For deeper applications, the HXJ180 offers a maximum hook load of 1,800 kN (405,000 lb) with a drawworks rating of 750 hp, workover depth reaching 6,500 m using 3½＂ drill pipe, and drilling depth of 3,000 m using 4½＂ drill pipe. The two-section telescoping mast can be erected and lowered hydraulically, and the entire rig complies with API Spec 4F, 7K, and 8C — the global gold standards for drilling and workover equipment.
3. 2,250 kN Offshore Hydraulic Workover Breakthrough
In 2025, SJ successfully completed the development of its 2,250 kN offshore hydraulic workover unit — a major technological breakthrough representing the new generation of hydraulic intervention technology for marine environments. This advanced unit incorporates four core technologies: high-efficiency lifting and gripping, high-torque application and transmission, split-type power integration and distribution, and highly adaptive inter-well skidding.
Field performance has been outstanding across nearly 100 well interventions on four platforms in the East China Sea and South China Sea, achieving:
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Maximum lifting load: 176 tons
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Maximum rotational torque: 22 kN·m
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Maximum rotational speed: 50 RPM
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Maximum operational efficiency: 28 pipe connections per hour
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Unmanned continuous operation: up to 72 hours without shutdown
The integrated flow control system operates at up to 1,200 L/min and 21 MPa, with adaptive flow and pressure regulation that automatically manages reaction torque during rotary operations — significantly improving both safety and stability in offshore conditions. This equipment fills a critical gap in domestic Chinese hydraulic workover technology and matches the best available internationally.
*[Product images: SJ’s 2,250 kN offshore hydraulic workover unit in operation on an East China Sea platform — next-generation hydraulic intervention technology]*
4. API-Certified, Offshore-Proven Compliance
All SJ offshore workover equipment is designed and manufactured in compliance with API Spec Q1, 4F, 7K, and 8C. Our manufacturing facility holds API monogram licenses across 15 core product categories, along with ISO 9001 and HSE management system certifications. Our third-party accredited inspection lab (SJPETRO) provides independent testing and calibration services, giving you full traceability and confidence in every component.
For offshore applications, we also offer ABS (American Bureau of Shipping) works approval, CE marking, and CU-TR (GOST) certification — meaning your offshore workover unit can be deployed in virtually any regulatory jurisdiction worldwide without compliance headaches.
5. Built for the Marine Environment
We don’t just take a land rig and bolt it to a skid. SJ offshore workover equipment is purpose-built with features that matter at sea:
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Corrosion-resistant materials — stainless steel piping and fittings throughout, with specialized coating systems for salt spray protection
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Explosion-proof electrical systems — rated Exd II BT5/Exd II BT6 with IP55 protection, mandatory for hazardous offshore zones
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High wind load capacity — masts designed to withstand typhoon-force conditions with rated wind speeds exceeding 55 m/s (107 knots) for operational safety
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Concentrated fluid and cable distribution — fuel, freshwater, seawater, compressed air, electrical cables, and fire suppression lines all integrated into a single elevated distribution system for deck space efficiency
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Modular design for crane limitations — every module weight is optimized for typical platform crane lift capacities, so you don’t need a special heavy-lift vessel just to get the equipment onboard
6. Automatic Lubrication and HSE-Focused Design
Our offshore workover rigs feature centralized automatic lubrication systems that reduce maintenance man-hours and eliminate the safety risks associated with manually greasing components in hazardous locations. The entire design follows HSE (Health, Safety, Environment) principles, with multiple safety interlocks, automatic emergency shutdown systems, and ergonomic control stations that keep operators safe without compromising efficiency.
SHXJ Series Offshore Workover Equipment — Technical Specifications
The table below summarizes key parameters for SJ’s SHXJ series offshore workover rigs, designed for fixed platform applications across a range of hook load requirements:
| 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 |
HXJ Series Offshore Workover Rigs — Dual-Purpose Capabilities
The HXJ series (HXJ90 through HXJ315) offers drill-workover versatility with maximum hook loads ranging from 900 kN to 3,150 kN and power options including diesel engine or AC variable-frequency motor drives:
| Model | Max Hook Load (kN) | Drawworks Power | Workover Depth (3½＂ DP) | Drilling Depth (4½＂ DP) |
|---|---|---|---|---|
| HXJ90 | 900 | 269 kW / 360 hp | 2,500 m / 8,200 ft | 1,000 m / 3,280 ft |
| HXJ135 | 1,350 | 330–450 hp | 3,500–4,000 m | 2,000–3,000 m |
| HXJ180 | 1,800 | 750 hp | 6,500 m / 21,300 ft | 3,000 m / 9,840 ft |
| HXJ225 | 2,250 | 1,000 hp (typical) | 7,500+ m | 4,000+ m |
Note: HXJ series technical specifications based on SJ documentation and publicly available data. Contact SJ for complete current specifications.
Key HXJ series features:
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Hydraulic drive for lateral and longitudinal base movement — cluster well capability
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Two-section telescoping mast with hydraulic erection
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Band brake with forced circulation cooling or optional hydraulic disc brake
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Water brake auxiliary brake system
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Rotary table with forward/reverse gearing and anti-reverse device to prevent drill string reversal accidents
What Makes SJ Different — Why Engineers and Procurement Teams Choose Us for Offshore Workover
1. Platform-Specific Engineering, Not Off-the-Shelf Modifications
Here’s the reality: most workover rigs are designed for land first, then adapted for offshore. SJ does the opposite. Our offshore workover equipment is architected from the ground up for the unique constraints of marine operations — deck load limits, crane lift capacities, corrosion environments, and space restrictions. When your platform has non-standard deck penetrations or an unusual wellhead layout, we don't tell you "we’ll make it work.” We engineer a solution that fits perfectly.
2. Sinopec-Grade Quality — Built to the Same Standards as the World's Largest 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 certifications aren’t just paperwork — they’re the daily operating standards across our 180,000 m² 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.
3. Complete Integrated Offshore Workover Solutions — 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. Factory Witness Testing Before It Ships — You See It Work Before We Deliver
Before any offshore workover unit leaves our facility, it undergoes full factory acceptance testing (FAT) at our 50,000 m² assembly yard — including full load testing up to 750 tons. We encourage and welcome your engineers and third-party inspectors to be present for every test. And because we have two dedicated offshore commissioning sites on our yard, your equipment is tested in a configuration that closely mimics actual platform conditions.
5. Global After-Sales Support — Parts and Service Where You Need Them
We maintain regional service centers and parts warehouses in key offshore hubs. 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.
6. 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 performed nearly 100 well interventions on four platforms, achieving 72-hour continuous unmanned operation. This isn't prototype technology — it’s production-proven equipment operating in some of the most challenging marine environments on the planet.
Applications — Where SJ Offshore Workover Equipment Excels
| Application | Environment | Recommended Equipment |
|---|---|---|
| Production platform well servicing & workover | Fixed platforms, compliant towers | SHXJ series (90–225 models); modular skid-mounted configuration |
| Cluster well workover on multi-well platforms | Fixed platforms with multiple well slots | HXJ series with hydraulic lateral/longitudinal walking base |
| Offshore hydraulic well intervention | Jack-up rigs, deepwater platforms | 2,250 kN hydraulic workover unit with automated control |
| Drill-workover operations (side-tracking, shallow drilling) | Production platforms with development drilling needs | HXJ series dual-purpose units (HXJ135, HXJ180, HXJ225) |
| Subsea well intervention (through tubing) | Deepwater, subsea completions | Hydraulic workover unit with subsea interface capability |
| Abandonment and decommissioning | Mature offshore fields | High-capacity workover units (2,250 kN class) |
| Sand control & gravel pack workover | Unconsolidated reservoirs, sandstone formations | Offshore workover rigs 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 |
For operators managing mature offshore assets — where workover interventions are routine rather than exceptional — SJ’s offshore workover equipment delivers the reliability and efficiency you need to maximize uptime and minimize deferred production.
Frequently Asked Questions (FAQ)
Q1: What certifications does SJ hold for offshore workover equipment?
SJ holds API Spec Q1, 4F, 7K, and 8C monogram licenses covering all relevant workover equipment categories. 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. Our equipment is designed and manufactured in accordance with API, GB/T 23505 (Chinese petroleum drilling and workover rig standard), and relevant offshore industry codes.
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 6 to 10 months from order confirmation to factory acceptance testing (FAT). For standard SHXJ models with minimal customization, we can often expedite to 5–6 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 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, Singapore, and Houston, 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.
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 in the South China Sea, East China Sea, and Southeast Asia — not just in factory brochures.
Q8: 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.
Q9: Do you offer financing or leasing options for offshore workover equipment?
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. Discuss your project financing needs with our sales team.
Q10: How does SJ handle transportation and logistics for offshore equipment?
We have extensive experience coordinating platform deliveries, including specialized transport for oversized modules, load-out to barges and vessels, and coordination with platform crane schedules. Our logistics team works directly with your platform operator to ensure smooth delivery and rig-up with minimal platform downtime.
