Offshore workover rig maintenance

Technical Specifications – Offshore Workover Rig Maintenance Services

XJ Series – OEM Maintenance Coverage

Component / System	Preventive Maintenance	Major Overhaul Interval	Key Inspection Points
Drawworks	Weekly drum inspection, brake lining check, gearbox oil level	4,000–6,000 operating hours	Drum cracks, brake band wear, bearing noise, gear tooth pitting
Mast & Substructure	Daily visual, monthly weld inspection, annual NDT	10 years or as required	Corrosion pitting, cracked welds, cylinder leakage, pin wear
Hydraulic System	Daily leak check, weekly filter change, quarterly fluid analysis	5,000–8,000 operating hours	Pump cavitation, valve spool wear, hose abrasion, fluid contamination
Carrier Engine (CAT)	Daily fluid check, weekly filter service	Per Caterpillar OEM schedule	Oil consumption, coolant condition, exhaust color, belt tension
Transmission (Allison)	Daily fluid level, monthly filter inspection	Per Allison OEM schedule	Shift quality, torque converter stall, fluid contamination
Control System	Weekly function test, monthly sensor calibration	10 years or component‑level	PLC battery, sensor drift, solenoid response, emergency stop function
Wireline / Hoisting	Daily cable inspection, weekly sheave lubrication	Cable: per API 9B / Sheave: 5,000 hours	Cable broken wires, sheave groove wear, bearing condition

Product Types – Offshore Workover Rig Maintenance Solutions

We organize our offshore workover rig maintenance services into four primary categories, each tailored to your operational model and regulatory requirements.

1. Scheduled Preventive Maintenance (SPM) Contract

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

What’s included:

• 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 of mast and drawworks (where required by class or internal policy)

• Service documentation with recommendations for upcoming maintenance

• Priority access to OEM spare parts

• Remote monitoring support via video call between visits

Typical cadence: Quarterly (every 3 months) or semi‑annual (every 6 months)

2. 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.

What’s included:

• 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 (new brake bands, adjusted linkages, test to API 8C)

• Hydraulic pump and motor overhaul (new seals, bearings, wear plates)

• Hose replacement (all hydraulic hoses replaced on age‑based schedule)

• Reservoir cleaning and fluid flush

• Control panel refurbishment (new switches, indicators, PLC battery replacement)

• Engine and transmission major service (per Caterpillar / Allison OEM schedule)

• Full load testing and function verification

• Recertification documentation package

Location: Our 50,000 m² assembly yard in Jingzhou, Hubei (or on‑site at customer’s facility for large rigs)

3. Offshore Field Service & Emergency Repair

Best for: Unscheduled breakdowns, urgent repairs that cannot wait for scheduled maintenance, and operators without a dedicated maintenance team.

What’s included:

• 24/7 dispatch to offshore platform or fixed installation (subject to travel and offshore access)

• Mobile field service truck with common spare parts and diagnostic tools

• On‑site hydraulic leak repair, valve replacement, pump repair, hose replacement

• Drawworks brake band replacement (emergency service)

• Mast raising cylinder swap

• Control system diagnostics and component replacement

• Engine and transmission field repairs

Emergency response: 48–72 hours dispatch from our nearest service hub (China, with international deployment available). Local parts shipped via DHL/FedEx within 24 hours.

4. OEM Training & Technical Support

Best for: Operators who want to build in‑house maintenance capability for their offshore rig fleet.

What’s included:

• On‑site training (1–2 weeks) – Preventive maintenance, inspection techniques, safety procedures, basic troubleshooting

• Factory training (3–5 days) – Deep dive into drawworks overhaul, hydraulic system repair, control system diagnostics, conducted at our Jingzhou facility

• Remote video support – On‑call engineering assistance via live video during maintenance events

• Digital documentation – Operation manuals, maintenance procedures, spare parts catalogs, video tutorials

• Certification – Operators complete competency assessment; certificates issued by SJ Petro

5. OEM Spare Parts Consignment Program

Best for: Operators with multiple XJ series rigs in a single region (offshore China, Middle East, Southeast Asia).

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)

Why Choose SJ Petro for Offshore Workover Rig Maintenance?

Because general repair shops cannot bring OEM engineering data, original material specifications, and factory load test stands to your maintenance problem.

Your Offshore Maintenance Challenge	SJ Petro’s OEM Answer
"We have a hydraulic system fault that no one can diagnose.”	We designed the hydraulic system. We have the original schematics, the component specifications, and the engineers who know failure modes.
"We need a mast weld repaired and recertified to API 4F.”	We hold the original FEA load models. We know the exact weld procedure, the heat‑treat specifications, and the correct NDT methods.
"Our drawworks brake system is underperforming after a third‑party repair.”	We supply OEM brake bands with documented friction materials and test to API 8C standards on our in‑house load test stands.
"Our control system is obsolete and replacement parts are unavailable.”	We can retrofit modern PLCs while maintaining compatibility with existing sensors and actuators.
"We need to extend our rig service life for another contract.”	We perform full life‑extension evaluations – mast NDT, drawworks overhaul, control system upgrade, and recertification.
"Our rig has been modified by previous owners. We need as‑built documentation.”	We can reverse‑engineer modifications and produce updated as‑built drawings, restoring OEM documentation for regulatory compliance.

More reasons to trust SJ Petro:

• OEM of XJ series workover rigs – we built the rig; we know every component and every assembly procedure

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

• API 4F, 7K, 8C certified – full OEM documentation, API monogram available on request

• Caterpillar + Allison authorized service partner – OEM‑level support for engine and transmission

• In‑house manufacturing – we machine our own drawworks drums, fabricate masts, assemble hydraulic systems

• Global field service – rigs supported on six continents

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

Frequently Asked Questions (FAQ) – Offshore Workover Rig Maintenance

Q1: Why should I choose an OEM over a general repair shop for my offshore workover rig maintenance?

A: General repair shops may be competent for routine maintenance, but they do not have the original engineering data, material specifications, or specialized tools that the OEM possesses. When the problem is a cracked mast weld, a worn drawworks drum beyond specification, or a control system failure, only the OEM can diagnose and repair with full confidence. Additionally, OEM repairs come with full material traceability, original specification compliance, and API certification – documentation that is often required by class societies and regulators.

Q2: What is included in a major overhaul for an XJ series workover rig?

A: A major overhaul typically includes complete disassembly of the drawworks, mast hydraulic system, and control system; NDT inspection of all structural components; bearing and seal replacement; brake system rebuild; hydraulic pump and motor overhaul; hose replacement; reservoir cleaning and fluid flush; control panel refurbishment; engine and transmission major service; full load testing; and recertification documentation. Overhauls are performed at our 50,000 m² yard in Jingzhou, Hubei.

Q3: What is the difference between preventive, predictive, and breakdown maintenance?

A: Preventive maintenance is scheduled based on time or operating hours (e.g., change hydraulic oil every 2,000 hours). Predictive maintenance uses real‑time data (fluid analysis, vibration monitoring, thermography) to schedule service when component condition indicates it is needed – before failure but not on a fixed schedule. Breakdown maintenance is repair after failure. Our recommended strategy is a balanced mix: preventive for safety‑critical systems (brakes, BOP control), predictive for wear‑dominated systems (hydraulics, bearings), and breakdown for non‑critical systems where the cost of preventive service exceeds the cost of repair.

Q4: Can you provide on‑site field service for an offshore platform?

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

Q5: What spare parts should I stock on my offshore platform for an XJ series rig?

A: Recommended on‑platform spares based on typical offshore operations:

• 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)

• Control system sensors (pressure transducers, temperature sensors, proximity switches)

• Electrical relays and fuses (assorted common types)

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

Q6: Do you offer training for our offshore maintenance crew?

A: Yes. We offer on‑site training (1–2 weeks) covering preventive maintenance, inspection techniques, safety procedures, hydraulic troubleshooting, brake system adjustment, and control system diagnostics. We also offer factory training at our Jingzhou facility (3–5 days) for deep‑dive drawworks overhaul, hydraulic system repair, and control system engineering. All training includes digital manuals, video tutorials, and remote support.

Q7: Can you recertify my XJ series rig to meet API requirements after major repairs?

A: Yes. As the OEM, we can recertify the rig to the original API 4F, 7K and 8C standards after major repairs or overhaul. We provide complete recertification documentation including material test reports, NDT reports, load test certificates, API data sheets, and as‑built drawings. Third‑party witnessed inspection (SGS, BV, DNV) is available upon request.

Q8: What is the typical warranty on OEM maintenance and repair work?

A: 12 months on parts and labor 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.