Technical Specifications
SJ Petro offers a complete range of supercapacitor energy storage workover rigs covering hook loads from 250 kN to 750 kN. Below are the key specifications for our series:
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Model
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XJ250-ESS
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XJ350-ESS
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XJ450-ESS
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XJ650-ESS
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XJ750-ESS
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Rated Hook Load
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400 kN
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600 kN
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800 kN
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1,000 kN
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1,200 kN
|
|
Max. Static Hook Load
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675 kN
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900 kN
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1,125 kN
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1,470 kN
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1,800 kN
|
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Workover Depth (2-7/8″ DP)
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2,000 m
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3,200 m
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4,500 m
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7,000 m
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8,000 m
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|
Workover Depth (3-1/2″ DP)
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—
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2,500 m
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3,500 m
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5,500 m
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6,500 m
|
|
Grid Connection
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50 kVA / 400V
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50 kVA / 400V
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50–100 kVA
|
100 kVA
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100 kVA
|
|
Supercapacitor Module
|
Integrated
|
Integrated
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Integrated
|
Integrated
|
Integrated
|
|
Drive Type
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VFD + Supercapacitor
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VFD + Supercapacitor
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VFD + Supercapacitor
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VFD + Supercapacitor
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VFD + Supercapacitor
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|
Energy Savings vs. Diesel
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60%+
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60%+
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60%+
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60%+
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60%+
|
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Charge/Discharge Cycles
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1,000,000+
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1,000,000+
|
1,000,000+
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1,000,000+
|
1,000,000+
|
|
Response Time
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<100 ms
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<100 ms
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<100 ms
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<100 ms
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<100 ms
|
|
Operating Temperature
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-20°C to +45°C
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-20°C to +45°C
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-20°C to +45°C
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-20°C to +45°C
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-20°C to +45°C
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Supercapacitor Energy Storage System Specifications:
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Parameter
|
Specification
|
|
Energy Storage Type
|
Supercapacitor Module
|
|
Charge/Discharge Cycle Life
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Up to 1,000,000 cycles (~20 years)
|
|
Dynamic Response Time
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<100 ms
|
|
Grid Voltage
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400V AC (standard pumping unit transformer)
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|
Transformer Capacity
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50 kVA minimum
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|
Power Supply Compatibility
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Grid power, diesel generator, natural gas generator, photovoltaic
|
|
Energy Recovery
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~0.4 kWh per 3,000m lowering cycle
|
|
Control Technology
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High-speed DSP with real-time monitoring
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|
Protection Features
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Comprehensive self-diagnostic and protection functions
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Applications
SJ Petro's Series Supercapacitor Energy Storage Workover Rigs are deployed across a broad spectrum of oilfield operations:
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Remote Well Sites with Limited Grid Capacity – The primary application. Operates on existing 50 kVA pumping unit transformers, eliminating the need for high-voltage line installation.
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Light to Medium Workover Operations – Sand flushing, pump inspection, paraffin removal, fishing, and tubing/downhole tool replacement
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Well Servicing & Maintenance – Routine maintenance, tubing replacement, and pump repairs for production wells
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Oil Testing & Fishing – Precision retrieval of downhole tools and equipment
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Environmentally Sensitive Areas – Zero on-site emissions, significantly reduced noise, and elimination of diesel fuel consumption
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Fields with "Electricity Replacing Oil” Initiatives – Supports oilfield operators in meeting emissions reduction targets and lowering operating costs
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Urban-Adjacent Oilfields – Low noise and zero emissions make these rigs ideal for operations near residential areas
Product Types
SJ Petro offers a comprehensive range of supercapacitor energy storage workover rig configurations:
1. Supercapacitor Energy Storage Electric Workover Rigs (ESS Series) – Our flagship product line integrating VFD drive with supercapacitor energy storage. Available in models XJ250 through XJ750.
2. Grid-Powered Supercapacitor Workover Rigs – Direct connection to site power with supercapacitor storage for peak load compensation. Ideal for fields with established grid infrastructure.
3. Diesel-Electric Dual-Power Workover Rigs with Supercapacitor – Flexible hybrid configuration combining diesel engine, electric drive, and supercapacitor energy storage for operational redundancy and transitional capability.
4. Trailer-Mounted Electric Energy Storage Workover Rigs – Lightweight, towable configurations with supercapacitor storage, ideal for short-distance moves and operations in space-constrained locations.
5. Retrofitted Supercapacitor Energy Storage Systems – We can upgrade existing electric workover rigs with supercapacitor energy storage control systems, delivering significant performance improvements without full equipment replacement.
6. Specialized Configuration Workover Rigs – Available in desert, low-temperature, no-guyline, and self-tensioning guyline configurations with supercapacitor energy storage.
OEM & Customization Solutions
Every oilfield presents unique challenges, and SJ Petro's engineering team delivers tailored solutions through our comprehensive OEM and customization capabilities:
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Customized Power Configurations – Choose from grid-only, supercapacitor ESS, diesel-electric dual-power, or hybrid configurations to match your site infrastructure and operational priorities.
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Supercapacitor Capacity Selection – We optimize supercapacitor module capacity based on your specific operational requirements, grid conditions, and load profiles.
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Custom Chassis & Mobility – We adapt chassis specifications and drive configurations to suit your specific terrain and transport requirements.
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Automation Package Selection – Choose from manual to semi-automated to fully automated configurations, including power catwalk, hydraulic pipe box, and integrated control systems.
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Modular Component Choice – Choose mast heights, traveling systems, drum configurations (single or double), and well control equipment.
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Climate-Specific Engineering – We offer specialized configurations for desert, arctic, tropical, and mountain terrain operations.
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Retrofit Solutions – We can upgrade existing electric workover rigs with supercapacitor energy storage systems.
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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?
Pioneer in Supercapacitor Energy Storage Workover Technology
SJ Petro has been at the forefront of developing supercapacitor energy storage workover rigs, pioneering the integration of supercapacitor technology with VFD drive systems. Our supercapacitor energy storage workover rigs are operating in various oilfields under Sinopec and CNPC, forming a serialized product line from XJ250 to XJ750.
Proven Track Record – 2,600+ Rigs Manufactured
Since developing China's first domestically manufactured workover rig, SJ Petro has produced over 2,600 workover rigs of all types. We have built the largest workover equipment manufacturing base in China with a 50,000 m² rig assembly yard and 24 rig-up positions.
Over 50 Patents – Industry-Leading Innovation
Our 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.
Rigorous Quality Certifications
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 standards.
Field-Proven Performance
Our supercapacitor energy storage workover rigs have been validated through extensive field trials:
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XJ900DB: 3-month trial in Huabei Oilfield – 7.67 tons fuel saved, 28,800 RMB energy cost saved
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SXJ700: Industrial trial in Jiangsu Oilfield – 2,622m operating depth, 31t maximum hook load
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XJ250: Industrial operation trials in Zhongyuan Oilfield – excellent results, passed Sinopec Group advanced equipment appraisal
Global Deployment
Our workover rigs have been exported to more than 30 countries and regions worldwide, including the United States, Indonesia, Malaysia, South America, Western Africa, and the Middle East.
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.
Top-Tier Industry Recognition
Ranked among China's Top 10 Petroleum Drilling and Production Equipment Manufacturers and rated AAA by China Petrochemical Industry and banks.
Frequently Asked Questions
Q: What is a supercapacitor energy storage workover rig?
A: It is an electric workover rig that integrates supercapacitor energy storage with variable frequency drive technology. The supercapacitor module absorbs grid power during idle intervals and releases stored energy during high-load lifting operations, enabling full-performance workover even with limited grid capacity.
Q: What are the advantages of supercapacitors over batteries for workover rigs?
A: Supercapacitors offer extremely high power density, exceptional efficiency, and extraordinarily long operational life – up to 1,000,000 charge/discharge cycles (~20 years). They handle the frequent, high-current charge/discharge demands of workover operations much better than batteries, which suffer from rapid capacity decay, high temperature rise, and low system efficiency.
Q: What is the minimum grid capacity required?
A: Our supercapacitor workover rigs operate on existing 50 kVA / 400V pumping unit transformers. This eliminates the need for complex and expensive high-voltage line installation and demolition.
Q: How much energy can I save compared to a diesel rig?
A: Field application results demonstrate energy cost savings of over 60% compared to conventional diesel-powered workover rigs. The XJ900DB saved 7.67 tons of fuel and 28,800 RMB in energy costs during a 3-month trial.
Q: How does the supercapacitor system charge and discharge?
A: The system operates on a "peak shaving and valley filling” strategy. The supercapacitor absorbs grid power during idle or low-load intervals and releases stored energy during high-load lifting operations. This happens automatically through the intelligent control system with a response time of less than 100 milliseconds.
Q: Can the system recover energy during pipe lowering?
A: Yes. The system recovers regenerative energy during braking and lowering operations. Approximately 0.4 kWh of energy is recovered per lowering cycle of a 3,000-meter drill string.
Q: How long do the supercapacitors last?
A: Supercapacitors are rated for up to 1,000,000 deep charge/discharge cycles, equivalent to approximately 20 years of service life.
Q: What is the operating temperature range?
A: The system operates reliably from -20°C to +45°C with splash-proof and cooling technology.
Q: Can the rig operate with other power sources?
A: Yes. The system is compatible with grid power, diesel generators, natural gas generators, and photovoltaic systems.
Q: Does the supercapacitor system change the driller's operating habits?
A: No. The system is designed to be transparent to operators – it does not alter the work cycle or the driller's operating habits.
Q: Are your products API certified?
A: Yes. SJ Petro holds API, ISO9001 , and HSE management system certifications. Our rigs are designed and manufactured in compliance with API Spec Q1, 4F, 7K, 8C, and RP500 standards.
Q: Do you offer OEM or customized solutions?
A: Absolutely. We offer comprehensive customization including supercapacitor capacity selection, power configuration, chassis specifications, automation packages, and climate-specific engineering.
Q: Can you retrofit my existing electric workover rig with supercapacitor storage?
A: Yes. We offer retrofit solutions to upgrade existing electric workover rigs with supercapacitor energy storage control systems.
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.
Tag: Workover Rig | Mobile workover rig | Workover rig manufacturers | Workover rig technology | Heavy duty offshore workover rig
