Products
Series Mountain Workover Rigs
Technical Specifications
SJ Petro's Series Mountain Workover Rigs are available across the full XJ series range. Below are the key specifications for representative models:
| Model | XJ250 | XJ350 | XJ450 | XJ550 | XJ650 | XJ1000 | XJ1200 |
|---|---|---|---|---|---|---|---|
| Rated Hook Load | 400 kN | 600 kN | 800 kN | 1,000 kN | 1,200 kN | 1,500 kN | 1,800 kN |
| Max. Static Hook Load | 675 kN | 900 kN | 1,125 kN | 1,350 kN | 1,470 kN | 1,800 kN | 2,250 kN |
| Workover Depth (2-7/8″ DP) | 2,000 m | 3,200 m | 4,500 m | 5,800 m | 7,000 m | 8,000 m | 9,000 m |
| Workover Depth (3-1/2″ DP) | — | 2,500 m | 3,500 m | 4,500 m | 5,500 m | 6,500 m | 7,500 m |
| Installed Power | 250 hp | 350 hp | 450 hp | 550 hp | 650 hp | 750 hp | 1,000 hp |
| Mast Type | Hydraulic Lifting | Hydraulic Lifting | Hydraulic Lifting | Hydraulic Lifting | Hydraulic Lifting | Hydraulic Lifting | Hydraulic Lifting |
| Chassis Configuration | Mountain-spec | Mountain-spec | Mountain-spec | Mountain-spec | Mountain-spec | Mountain-spec | Mountain-spec |
| Gradeability | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced |
| Terrain Suitability | Mountain/Hilly | Mountain/Hilly | Mountain/Hilly | Mountain/Hilly | Mountain/Hilly | Mountain/Hilly | Mountain/Hilly |
| Operating Temperature | -35°C to +50°C | -35°C to +50°C | -35°C to +50°C | -35°C to +50°C | -35°C to +50°C | -35°C to +50°C | -35°C to +50°C |
| Compliance | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C | API 4F, 7K, 8C |
Key Mountain-Specific Features:
| Feature | Benefit for Mountain Operations |
|---|---|
| Enhanced Gradeability | Climbs steep mountain roads safely |
| Compact Footprint | Fits on constrained ridgeline wellsites |
| Self-Propelled Chassis | No separate transport vehicles needed |
| Hydraulic Mast Erection | No crane required for rig-up |
| All-Weather Operation | Reliable in snow, rain, and extreme sun |
| High-Altitude Ready | Engineered for reduced oxygen environments |
Applications
SJ Petro's Series Mountain Workover Rigs are deployed across a broad spectrum of challenging terrain operations:
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Mountainous Oil & Gas Fields – Workover operations in rugged, high-altitude terrain where conventional rigs cannot access
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Hilly & Rolling Terrain – Operations in regions with steep grades and limited road infrastructure
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High-Altitude Fields – Engineered for reduced oxygen environments at elevation
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Remote Mountain Wellsites – Access to wells in locations with narrow, winding access roads
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Multi-Well Mountain Pads – Rapid mobilization between wells on mountain ridgelines
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Workover & Well Servicing – Tubing replacement, pump repairs, and production optimization
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Oil Testing & Fishing – Precision retrieval of downhole tools and equipment
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Shallow-to-Medium Depth Drilling – When equipped with rotary table, the rig can perform mobile drilling operations
Product Types
SJ Petro offers the Series Mountain Workover Rig in multiple configurations to match various operational requirements:
1. Standard Mountain Workover Rig (XJ Series) – Self-propelled configuration with enhanced gradeability and compact footprint for mountain operations. Available across XJ250 through XJ1200 models.
2. High-Altitude Mountain Workover Rig – Specialized configuration with engine tuning and systems optimized for reduced oxygen environments at elevation.
3. Low-Temperature Mountain Workover Rig – Engineered for mountain operations in extreme cold with specialized materials and heating systems.
4. No-Guyline Mountain Workover Rig – Eliminates the need for guyline anchors—critical for ridgeline wellsites with limited anchor points.
5. Dual-Power Mountain Workover Rig – Oil-electric dual-drive configuration providing operational flexibility and redundancy.
6. Electric Drive Mountain Workover Rig – Grid-powered or battery energy storage configuration for environmentally sensitive mountain areas.
7. LNG-Powered Mountain Workover Rig – Clean-burning natural gas option for regions with gas availability.
8. Quick-Move Mountain Workover Rig – Optimized for rapid relocation between wells in multi-well mountain pads.
OEM & Customization Solutions
Every mountain presents unique challenges, and SJ Petro's engineering team delivers tailored solutions through our comprehensive OEM and customization capabilities:
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Custom Chassis & Mobility – We adapt chassis specifications, tire configurations, and suspension systems for your specific terrain conditions—rocky slopes, loose gravel, mud, or snow.
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Enhanced Gradeability – Customized power-to-weight ratios and transmission tuning for the grades you face.
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Compact Footprint Design – Optimized overall dimensions for your specific access road and wellsite constraints.
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High-Altitude Tuning – Engine and systems optimization for operations at elevation.
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Climate-Specific Engineering – Low-temperature, desert, and all-weather configurations available.
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Mast Configuration – Choose mast heights and lifting systems based on your operational requirements.
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Power System Selection – Choose from diesel (Caterpillar, Detroit Diesel), electric, dual-drive, or LNG configurations.
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Automation Package – Optional power catwalk, hydraulic pipe box, hydraulic elevated driller's cabin, and iron roughneck.
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Turnkey System Integration – From basic workover units to fully integrated packages with complete well control and solids control systems.
Why Choose SJ Petro?
Mountain-Terrain Engineering Expertise
SJ Petro has been designing and manufacturing workover rigs for over four decades, with specific expertise in mountain, swamp, desert, tidal flat, and extremely cold area operations. Our mountain workover rigs are engineered to overcome the unique challenges of rugged terrain—steep grades, narrow roads, limited wellsite space, and extreme weather.
Proven Track Record – Complete Product Range
SJ Petro offers a complete line of workover rigs with maximum static loads ranging from 300 kN to 2,250 kN and workover depths up to 9,000 meters. Our product portfolio includes XJ150, XJ250, XJ350, XJ450, XJ550, XJ650, XJ1000, and XJ1200 series.
Over 50 Patents – Industry-Leading Innovation
SJ Petro's workover equipment portfolio has earned over 50 patents, with particular strength in LNG workover rigs, oil-electric dual-power workover rigs, supercapacitor energy storage electric drive systems, and ground pipe handling systems.
API-Certified Quality
SJ Petro holds API (American Petroleum Institute) , ISO9001 , and HSE management system certifications. Our designs and manufacturing processes comply with API Spec Q1, 4F, 7K, 8C, and RP500.
Global Export Experience
Our workover rigs have been exported to more than 30 countries and regions worldwide, with customers including Sinopec, CNPC, CNOOC, and international oilfield service companies.
One-Stop Solution Provider
Beyond manufacturing, we offer equipment inspection, testing, and major overhaul services. From initial design to field service and spare parts supply, SJ Petro delivers complete oil and gas exploration and production equipment solutions.
Frequently Asked Questions
Q: What makes a mountain workover rig different from a standard workover rig?
A: Mountain workover rigs feature enhanced gradeability, compact footprint, superior off-road mobility, and specialized chassis configurations for safe and efficient operation on steep grades, narrow roads, and constrained mountain wellsites.
Q: What is the maximum grade the mountain workover rig can climb?
A: Gradeability varies by model and configuration. SJ Petro's engineering team can customize power-to-weight ratios and transmission tuning for your specific terrain conditions. Contact our sales team for detailed specifications based on your operational requirements.
Q: What rig models are available in mountain configuration?
A: Mountain workover rigs are available across the full XJ series range, from XJ250 through XJ1200, covering hook loads from 400 kN to 1,800 kN and workover depths from 2,000 m to 9,000 m.
Q: Can the mountain workover rig operate in high-altitude conditions?
A: Yes. We offer high-altitude configurations with engine tuning and systems optimized for reduced oxygen environments at elevation.
Q: Does the mountain workover rig require a crane for rig-up?
A: No. The rig features hydraulic mast lifting for safe and efficient rig-up and rig-down without crane assistance.
Q: What power options are available?
A: We offer diesel engine drive (Caterpillar, Detroit Diesel), electric drive, oil-electric dual-drive, and LNG-powered configurations.
Q: Can the mountain workover rig perform drilling operations?
A: Yes. When equipped with a rotary table, swivel, and drilling tools, the rig can perform as a mobile drilling rig for shallow-to-medium depth wells.
Q: Are your products API certified?
A: Yes. SJ Petro holds API, ISO9001 , and HSE management system certifications. Our designs comply with API Spec Q1, 4F, 7K, 8C, and RP500.
Q: Do you offer OEM or customized solutions?
A: Absolutely. We offer comprehensive customization including chassis configuration, gradeability tuning, compact footprint design, high-altitude tuning, climate-specific engineering, and automation packages.
Q: What is your manufacturing capacity and lead time?
A: We have the largest workover equipment manufacturing base in China with comprehensive production capabilities. Lead times vary by configuration—contact our sales team for specific project timelines.
Q: Do you provide after-sales support and spare parts?
A: Yes. We offer comprehensive after-sales support including spare parts supply, equipment inspection, testing, and major overhaul services.
Q: What specialized mountain configurations are available?
A: We offer high-altitude, low-temperature, no-guyline, dual-power, electric drive, LNG-powered, and quick-move configurations.
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