Workover services

Technical Specifications – Workover Services Coverage

The table below outlines the coverage scope for SJ Petro workover services. For complete service agreements, contact our technical sales team.

Service Category	Coverage	Key Deliverables
Emergency Field Service	Hydraulic leak repair, brake replacement, mast cylinder swap, control diagnostics, engine/transmission field repair	24‑hour parts dispatch; 48–72 h technician deployment
Preventive Maintenance	Scheduled inspections, fluid sampling, vibration monitoring, thermography, load testing	Quarterly/semi‑annual visits; service reports with recommendations
Major Overhaul	Drawworks full rebuild, mast NDT, hydraulic system overhaul, control panel refurbishment, drivetrain service	6–8 weeks turnaround (factory); recertification documentation
Spare Parts Supply	Genuine OEM parts: valves, seals, hoses, filters, brake bands, bearings, sensors, PLC modules	24 h emergency shipping; local consignment stock for large fleets
Remote Monitoring & Predictive Maintenance	Real‑time data collection, fault alarms, trend analysis, digital twin	Web dashboard; email/text alerts; maintenance scheduling recommendations
Wellhead Automation (WHCP + SCADA)	WHCP with RTU/PLC, sensors, actuators, SCADA software, communication equipment	Turnkey installation; operator training; SIL‑2/3 certification on request
Operator Training	Rig operation, maintenance, safety, WHCP/SCADA usage	1–2 weeks on‑site; digital manuals; remote support
Downhole Tool Supply	Fishing tools (overshots, spears, jars, magnets), milling tools (flat bottom, tapered, section mills), isolation tools (bridge plugs API 11D1 V3)	API‑certified tools; corrosion‑resistant finishes; rental/purchase options
Workover Programme Engineering	Job design, risk assessment, well‑specific procedure planning	Detailed workover plan; equipment selection; contingency procedures

Product Types – Workover Services Packages

We offer workover services in structured packages to match your operational model and budget.

1. Emergency Response & Field Repair Service

Best for: Unscheduled breakdowns, urgent repairs, operators without a dedicated maintenance team.

Includes: 24/7 dispatch to wellsite or platform, mobile service truck with common spares and diagnostic tools, on‑site hydraulic leak repair, valve/pump replacement, hose replacement, drawworks brake band replacement (emergency), mast cylinder swap, control system diagnostics, engine/transmission field repairs.

2. Scheduled Preventive Maintenance (SPM) Contract

Best for: Long‑term rig owners who want predictable maintenance costs and maximum uptime.

Includes: Fixed quarterly or semi‑annual on‑site inspections by OEM field service engineers, fluid sampling and analysis (hydraulic, engine oil, transmission fluid), vibration monitoring (drawworks bearings, rotating equipment), thermographic inspection (electrical panels, hydraulic components), load testing (where required), service documentation with recommendations, priority access to OEM spare parts, remote monitoring support.

3. OEM Major Overhaul & Recertification

Best for: Rig returning from extended campaign, rig approaching major service interval (5–10 years), or rig preparing for resale or lease.

Includes: Complete rig disassembly (drawworks, mast, hydraulic system, control system), NDT inspection of all structural components (mast welds, substructure, lifting lugs), bearing replacement (drawworks, sheaves, crown block, traveling block), brake system rebuild, hydraulic pump and motor overhaul, hose replacement, reservoir cleaning and fluid flush, control panel refurbishment, engine and transmission major service (Caterpillar/Allison OEM schedule), full load testing and function verification, recertification documentation package.

4. OEM Spare Parts Consignment Program

Best for: Operators with multiple XJ series rigs in a single region.

Program structure: Critical wear parts stocked at customer‑designated warehouse (onshore supply base or platform), inventory levels reviewed jointly monthly, replenishment shipments scheduled quarterly, emergency parts from SJ Petro main warehouse shipped within 24 hours, pricing at bulk OEM rates (discounts for consignment volume).

5. Remote Monitoring & Predictive Analytics Service

Best for: Operators who want to transition from reactive to data‑driven maintenance.

Includes: WHCP or rig control system data interface installation, real‑time parameter monitoring (pressure, rate, temperature, vibration), automated alarm generation (email/text/SMS), predictive trend analysis (bearing wear, valve degradation, fluid end fatigue), monthly health reports with maintenance recommendations, secure web dashboard for remote visibility.

6. Wellhead Automation Installation (WHCP + SCADA)

Best for: Operators adding smart wellhead control to existing wells or new completions.

Includes: WHCP with RTU/PLC, high‑accuracy sensors, fail‑safe actuators (hydraulic/pneumatic/electric), local HMI, SCADA software, communication equipment (4G/5G, satellite, radio), on‑site commissioning, operator training (2–5 days), SIL‑2/3 certification documentation on request.

7. Arctic‑Rated Workover Services

Best for: Siberian, Canadian and Alaskan operators. Extended operating temperature range to -45 °C. Includes low‑temperature hydraulic fluids (pour point below -55 °C), engine block heaters, battery warmers, heated air intakes for pneumatic systems, insulated hydraulic lines, heated control cabins, field service technicians trained for extreme‑cold deployment.

Why Choose SJ Petro for Workover Services?

Because workover services are not a commodity. You need a provider who has the engineering depth to diagnose complex failures, the parts inventory to ship genuine components immediately, and the field service reach to deploy technicians anywhere.

Your Service Challenge	SJ Petro’s Answer
"Our XJ650 mast hydraulics have intermittent hesitation. Three contractors have failed to diagnose.”	We have the original hydraulic schematics and FEA load models. We designed the system. We know the failure modes.
"We need a mast weld repaired and recertified to API 4F.”	We hold the original material specs and welding procedures. We can perform NDT and recertify to API standards.
"Our WHCP keeps generating false ESD alarms.”	We built the WHCP. We can recalibrate sensors, update PLC logic, or retrofit upgraded components on site.
"We have multiple XJ series rigs operating in South America, Western Africa and the Middle East. Parts are hard to get.”	Our consignment programme puts OEM spare parts on your logistics base. Emergency shipments arrive within 24 hours.
"We need to add remote monitoring to our rig fleet.”	Our remote monitoring platform works with existing WHCPs or new installations – real‑time data, predictive alerts, web dashboard.
*"We operate in Siberia at -45 °C. Our hydraulics freeze.”*	Arctic service package – low‑temp fluids, heated enclosures, battery warmers, cold‑weather seals. Proven in Russia.

More reasons to trust SJ Petro:

• Sinopec Group heritage – founded in 1941, over 80 years of oilfield equipment engineering

• API authorised manufacturer – monogram authorised on API 4F, 7K, 8C, 6A and 16C products

• 50,000 m² assembly yard – 24 rig‑up positions, full load test stands

• Global field service – deployments across six continents

• Comprehensive documentation – MTRs, hydrostatic certificates, NDT reports, API data sheets, as‑built drawings

• 24‑hour spare parts – emergency shipment from main warehouse

• Flexible service agreements – time‑and‑materials, fixed‑price contracts, or comprehensive lifecycle coverage

Frequently Asked Questions (FAQ) – Workover Services

Q1: What workover services does SJ Petro provide?

A: SJ Petro provides end‑to‑end workover services: workover programme engineering, equipment supply (XJ series rigs, downhole tools, WHCP/SCADA), on‑site field operations (fishing, milling, stuck pipe recovery, zone isolation, plug setting, casing repair), OEM maintenance and overhauls, spare parts supply, remote monitoring and predictive maintenance, wellhead automation integration, operator training and full documentation for regulatory compliance.

Q2: Can you provide emergency field service for an offshore workover rig?

A: Yes. Our field service teams can deploy to offshore platforms, jack‑ups and fixed installations. Deployment time depends on location and offshore access protocols – we work with your logistics and HSE teams. For emergencies, we can arrange expedited mobilisation (typically 48–72 hours from our nearest service hub). Travel, accommodation and offshore permits are billed as actuals.

Q3: What is the difference between preventive maintenance and a major overhaul?

A: Preventive maintenance is scheduled based on time or operating hours (e.g., oil changes, filter changes, lubrication, inspection). It is typically performed on‑site by field service technicians. Major overhaul involves complete disassembly of major components (drawworks, mast, hydraulic system), NDT inspection of all critical parts, bearing replacement, brake system rebuild, hose replacement, reservoir cleaning, control panel refurbishment, engine/transmission major service and full load testing. Overhauls are performed at our Jingzhou yard or on‑site for large rigs. Overhaul interval is typically 5–10 years or as required.

Q4: What spare parts should I stock for my XJ series workover rig?

A: Recommended on‑site spares based on typical operating hours:

• Hydraulic seals and O‑ring kits (full set for all cylinder sizes)

• Filter elements (hydraulic return, pressure and suction filters – 2 sets)

• Drawworks brake bands (1 set)

• Wireline (sufficient for two replacements)

• Spare hydraulic hoses (pre‑fabricated for all critical locations)

• Engine service kit (filters, belts, gaskets – per Caterpillar recommendation)

• WHCP sensors (pressure transducers, temperature sensors, proximity switches)

• Electrical relays and fuses (assorted common types)

We provide a customised spare parts recommendation based on your rig model and operating hours.

Q5: Do you offer remote monitoring for workover rigs?

A: Yes. Our remote monitoring platform collects real‑time data from WHCPs and rig control systems. Features include real‑time parameter monitoring (pressure, rate, temperature, vibration), automated alarm generation (email/text/SMS), predictive trend analysis (bearing wear, valve degradation), monthly health reports and a secure web dashboard for remote visibility. The platform supports both new installations and retrofits to existing equipment.

Q6: What documentation do you provide after a major overhaul?

A: For every major overhaul, we provide: detailed service report (work performed, parts replaced, measurements taken), OEM material test reports (EN 10204 3.1) for replaced pressure‑containing components, NDT reports (MT, PT, UT) for structural repairs, load test certificate (drawworks and mast), API data sheets (API 4F, 7K, 8C), as‑built drawings (updated with any modifications), wiring diagrams (control system), recertification letter from SJ Petro.

Q7: Can you retrofit remote monitoring to an older workover rig?

A: Yes. We offer a retrofit package that includes sensor installation (vibration, temperature, pressure), data gateway with cellular or satellite communication, and access to our web‑based monitoring dashboard. The retrofit typically takes 2–3 days per rig and does not require major modifications to the existing control system.

Q8: What is the lead time for a major overhaul at your Jingzhou facility?

A: Standard overhaul (drawworks, mast, hydraulic system, control system) at our Jingzhou yard: 6–8 weeks from rig arrival to completion, including inspection, repair, testing and documentation. Expedited overhaul (4–6 weeks) is available for an additional fee. On‑site overhauls (customer’s facility) take longer due to logistics and may require 10–12 weeks.

Q9: Do you provide operator training for workover rigs?

A: Yes. For every workover service engagement that includes new equipment or major maintenance, we include 1–2 weeks of on‑site training during commissioning, covering rig operation, maintenance, safety protocols, mast raising, emergency procedures, WHCP operation and SCADA usage. Digital manuals, video tutorials and remote support are also provided. Additional training (factory courses in Jingzhou, extended field training) is available at extra cost.

Q10: What is the warranty on workover service repairs?

A: 12 months on parts and labour for OEM repairs performed by SJ Petro, provided the rig is operated and maintained according to our published guidelines. Extended warranty (up to 5 years) is available for major overhaul packages. Wear parts (brake bands, seals, filters) are not covered for normal wear but are warranted for manufacturing defects.

Q11: Can you supply downhole workover tools as part of the service?

A: Yes. Through our subsidiary and extensive supply network, we provide a full range of API‑certified downhole workover tools: fishing tools (overshots, spears, jars, junk baskets, magnetic tools), milling tools (flat bottom, tapered, bladed, section mills), isolation tools (bridge plugs API 11D1 V3 certified, cement retainers, retrievable packers), and downhole accessories (bumper jars, hydraulic jars, safety joints, circulation subs). All tools are available with corrosion‑resistant finishes for marine environments. Rental and purchase options are available.

Q12: How do your workover service prices compare to third‑party providers?

A: For routine preventive maintenance (oil changes, filter changes, lubrication), third‑party providers may be less expensive. For major overhauls, complex diagnostics and component‑level repairs, OEM service is typically 10–30 % more – but the difference comes with genuine OEM parts, full documentation, correct procedures and warranty. For safety‑critical systems (brakes, masts, control systems, WHCP/SCADA), we strongly recommend OEM service.

Q13: Do you provide service contracts for workover rigs from other manufacturers?

A: Yes. While our core expertise is the SJ Petro XJ series, we also provide maintenance, repair and spare parts for workover rigs from other manufacturers (BOMCO, RG, Honghua, etc.) using OEM‑equivalent materials. However, for other brands, we do not have original engineering data, so repairs may require additional diagnostic time.

Q14: Can you perform workover services internationally?

A: Yes. We have performed workover services and major overhauls on XJ series rigs in South America, Western Africa, the Middle East, the United States, Russia and Southeast Asia. Options include local field service (technicians deploy to your location), component‑level overhaul (key components shipped to China for overhaul), and full rig return (rig returned to our Jingzhou yard for complete overhaul – best for major campaigns or lease returns). The XJ650 rig, for example, is highly popular among users across South America, Western Africa and the Middle East.