Products
Offshore drilling and workover rig
Technical Specifications – Side by Side
| Parameter | SJF450DB (Drilling) | SHXJ225 (Workover) | SHXJ112 (Workover) |
|---|---|---|---|
| Max. Hook Load | 4,500 kN (1,000,000 lb) | 2,250 kN (506,000 lb) | 1,120 kN (252,000 lb) |
| Drawworks Power | 1,470 kW (2,000 hp) | 550 kW (740 hp) | 185‑220 kW (250‑300 hp) |
| Drive System | AC VFD | AC VFD | AC VFD / Hyd / Elec |
| Top Drive | Standard | Standard (2,250 kN) | Optional (on DB version) |
| Mast Height | 45 m (148 ft) | 38 m (125 ft) | 31 m (102 ft) |
| Max Module Weight | ≤ 25t (can split) | ≤ 25t (can split) | ≤ 12t |
| Total Deck Load | ~250t | ~135t | ~68t |
| Certifications | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C |
Key Technologies Across Both Rig Types
AC Variable Frequency Drive (VFD) – Gold Standard for Offshore
Applied across our drilling rigs and larger workover rigs, AC VFD provides:
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Stepless speed regulation for precise control during fishing and jarring
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Dynamic braking – no overheated brake pads on long down‑runs
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Full torque at zero rotation – critical for working stuck tools
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Lower maintenance compared to mechanical or SCR systems
Modular Design – Engineered for Platform Logistics
All SJ offshore rigs are built in modules sized to platform crane limits (typically 25‑30 tons, splittable to 5‑8 tons for smaller cranes). Drilling modules and workover modules share common lifting points and interface dimensions – so your crew can switch between rig types without learning new procedures.
Marine Corrosion Protection – Built for Decades Offshore
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C5‑M marine coating – tested to 3,000+ hours salt spray
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Stainless steel fasteners in all exposed connections
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IP56 electrical enclosures – protected against heavy seas
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Galvanized cable trays and handrails
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Thermal spray aluminum (TSA) upgrade for tropical/sour service
Smart Control Systems
Newer rigs feature integrated intelligent controls and remote monitoring. The SjpetroDAS data acquisition system enables smart onsite operations and refined risk management – batch exported to Africa and operating in overseas oilfields.
Applications – Where Our Rigs Are Used
| Application | Rig Type | Typical Details |
|---|---|---|
| New well drilling | Drilling Rig | Initial hole, casing, completion – depths 3,000‑7,000m |
| Batch drilling | Drilling / Heavy Workover | Multiple new wells from existing platform |
| Routine workover | Workover Rig | Pump changes, rod and tubing pulls – frequent, light loads |
| Stuck packer pulling | Heavy Workover | Up to 1,600‑2,200 kN required – SHXJ158 or SHXJ225 |
| Sidetracking | Workover (with top drive) | Milling window, kicking off, 100‑500m horizontal section |
| Well deepening | Workover (AC VFD) | Adding 200‑500m of new hole below existing TD |
| Heavy fishing | Workover (large models) | Retrieving lost BHA, bits, stuck tools |
| Platform abandonment | Workover (large models) | Pulling all tubulars, cutting casing, setting plugs |
Real‑world deployments:
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Bohai Bay, China: 12 SHXJ112 units performing daily workover on 3,200m wells, 15‑ton platform cranes
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Kuwait: Six ZJ90DB (9,000m) deep well drilling rigs delivered – first bulk export of large drilling machines to Middle East high‑end market
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South China Sea: SJF drilling rigs and SHXJ225 workover rigs operating in deepwater fields
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Africa: Batch export of coiled tubing units with SjpetroDAS intelligent data acquisition system – overseas commissioning completed
Complete Product Line – Four Major Categories
SJ offers over 200 models across 12 families and four major categories:
| Category | Representative Products |
|---|---|
| Drilling & Workover Equipment | SJF Series drilling rigs, SHXJ/HXJ Series workover rigs, top drives, drawworks, masts |
| Cementing & Fracturing Equipment | Cementing units (skid/truck), fracturing packages (2,000‑5,000 HP), plunger pumps |
| Offshore Drilling & Production Equipment | Fixed platform drilling rigs, platform workover units, offshore BOP handling |
| High‑Pressure Fluid Control Products | Manifolds (21‑140 MPa), mud pumps, fracturing pumps, valves, fittings |
OEM Customized Solutions – Built for Your Platform
No two platforms are identical. That’s why every SJ offshore rig starts with a discussion about your specific constraints: crane capacity, deck space, power availability, well program, and environmental conditions.
What we routinely customize:
| Your Constraint | Our Solution |
|---|---|
| Crane capacity under 20 tons | Split modules down to 5‑8 tons (even on 2,250 kN rigs) |
| Tight deck space | Narrow skid base (as little as 2.2m wide), foldable work decks |
| No crane at all | Davit crane kit + self‑erecting mast |
| No platform AC power | Hydraulic drive (diesel‑hydraulic) or add generator skid |
| Inconsistent well spacing | Extended skid beams (up to 5m stroke) |
| Harsh environment (H₂S, high humidity) | TSA coating, 316L stainless steel wetted parts, explosion‑proof everything |
| Remote operation requirements | 4G/5G remote control with cameras – up to 50km from shore |
| Special wellhead access | Offset substructure to reach wellheads not centered on skid |
Our customization process:
Step 1 – Discovery: You send platform deck plan, crane capacity curve, well program, power availability.
Step 2 – Engineering study: Within 2 weeks, our offshore specialists (30+ engineers) produce a preliminary module split and deck load report.
Step 3 – Joint review: Online or on‑site review of layout.
Step 4 – Final engineering & manufacturing: Full traceability, in‑house fabrication.
Step 5 – Full load testing: Every rig proof‑tested to 110% of rated hook load at our 750‑ton test stand – you're invited to witness.
Step 6 – Shipping & offshore commissioning: Our field service team supervises rig‑up and runs the first job with your crew.
Why Choose SJ Petroleum Machinery?
| Reason | What You Actually Gain |
|---|---|
| Sinopec Group backing | Core equipment manufacturing enterprise of China Petrochemical Corporation. Financial stability, group‑wide technical resources, and over 70 years of manufacturing heritage. |
| 200+ models, one supplier | Four major categories, 12 families – drilling rigs, workover rigs, cementing, fracturing, manifolds. No finger‑pointing between multiple vendors. |
| API certified – fully traceable | API 4F, 7K, 8C, 6A, 16C, ISO 9001, HSE. Each pressure‑containing component API‑monogrammed. |
| Massive production capacity | 100 drilling rigs, 100 workover rigs, 120 cementing units, 80 fracturing units, 700+ pumps, 150,000 high‑pressure manifolds per year. |
| 50,000 m² assembly yard | 24 rig‑up positions, two offshore rig commissioning sites (four positions), 750‑ton test capacity – 12 rigs can be assembled simultaneously. |
| Global delivery track record | Sold to North America, South America, Middle East, Asia‑Pacific, Africa – over 40 oil‑producing countries. |
| Field service from rig hands | Our offshore supervisors have run these rigs themselves. 24/7 remote support. |
Frequently Asked Questions (FAQ)
Q1: What is the difference between an offshore drilling rig and a workover rig?
A: A drilling rig punches the initial wellbore – higher hook load (3,000‑4,500 kN), deeper depth capability. A workover rig maintains existing wells – lighter hook load (900‑2,250 kN), more frequent moves, often hydraulic or AC VFD. Many operators have both on the same platform.
Q2: Which model do I need for my platform?
Use this quick guide:
| Well depth (2‑7/8″ tubing) | Recommended Rig |
|---|---|
| ≤3,000m | SHXJ90 or SHXJ112 (workover) |
| 3,000‑3,500m | SHXJ112 or HXJ135 (workover) |
| 3,500‑4,200m | SHXJ158 (workover) |
| 4,200‑5,000m | SHXJ225 (heavy workover) |
| 5,000‑7,000m (new wells) | SJF315DB or SJF450DB (drilling) |
Then check your crane capacity – if under 20 tons, we can split modules further on any model.
Q3: What API certifications do you hold?
A: API 4F (drilling structures), 7K (drilling and well servicing equipment), 8C (hoisting equipment), 6A (wellhead equipment), and 16C (choke and kill manifolds). First enterprise in China to obtain API SPEC 16D logo.
Q4: Can you supply a complete equipment package for a new platform?
A: Yes – we supply integrated packages: drilling rig or workover rig, cementing unit, fracturing equipment, high‑pressure manifolds, mud pumps, drawworks, top drive, BOP handling, and control systems. Single‑source procurement, single‑point warranty.
Q5: What is the typical lead time?
A: Workover rigs (SHXJ/HXJ): 5‑9 months. Drilling rigs (SJF Series): 9‑12 months. Custom module splitting adds 1‑3 months.
Q6: Do you provide offshore installation and commissioning?
A: Yes – every rig order includes on‑site supervision of rig‑up, load testing, and first job assistance. Typical on‑site duration: 2‑6 weeks depending on rig size.
Q7: What training do you provide?
A: Standard: 1‑3 weeks on‑site training for up to 10 crew members. For AC VFD and top drive equipment, we also offer simulator‑based training at our Jingzhou facility.
Q8: What is the warranty?
A: 18 months from shipment or 12 months from commissioning (whichever first). Major components (top drives, AC VFD drives) have 24 months. Extended warranty available.
Q9: Can your rigs work in extreme environments?
A: Yes – we supply low‑temperature rigs for arctic conditions, desert‑spec rigs for Middle East heat, and tropical‑spec rigs for Southeast Asia (TSA coating, 316L stainless steel). Our drilling rigs operate across all environments – land, offshore, mountain, marsh, desert, tidal flat, and extremely cold areas.
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