Restoring Critical Jacking System Integrity

1. Introduction: The Challenge

The jacking and skidding system of a drilling rig is its backbone, critical for stability, mobility, and safe operation. When its reliability is compromised, the entire rig’s functionality and safety come under threat.

The Problem: A prior inspection of the LeTourneau-designed skidding system revealed multiple critical issues, from worn-out bearings to corroded case structures and hidden cracks in vital gears. These posed serious risks of failure and downtime.

The Solution Provider: Formura Offshore Services was entrusted with executing a comprehensive remedial project—an overhaul of all four drive units—to restore system integrity in line with OEM standards.

2. Project Scope & Objectives

The project was defined under a clear mandate: overhaul and remediate all four skidding units of the rig, ensuring complete compliance with OEM specifications.

Units Covered:

• Starboard (STBD) Aft Unit
• Starboard (STBD) Forward Unit
• Port (PORT) Aft Unit
• Port (PORT) Forward Unit

Objectives:

• Overhaul the Primary, Secondary, and Final Drive systems of each unit.
• Replace or repair failed and degraded components.
• Ensure the refurbished system meets OEM requirements for safe and reliable operations.

3. Key Challenges & Solutions

Challenge 1 – Unexpected Failures

Seized gearbox and cracked rack pinion required urgent solutions.

Solution: Flexible project management and efficient use of spares enabled timely recovery.

Challenge 2 – Corrosion & Structural Degradation

Severe corrosion across case structures.

Solution: Skilled welding repairs and protective coating restored integrity without full replacement.

Challenge 3 – Ensuring Long-Term Reliability

Need to ensure safety beyond immediate repair.

Solution: Comprehensive MPI testing ensured only structurally sound parts were retained.

4. Project Results & Conclusion

Results Delivered:

• Prevented Catastrophic Failure: Cracked pinion and seized gearbox were remediated before causing downtime.
• Extended System Lifespan: Overhaul significantly extended operational life of skidding units.
• Restored OEM Compliance: Units reassembled and tested to OEM standards, ensuring safe rig operations.

Restoring Critical Jacking System Integrity

Restoring the integrity of a critical jacking system is not just about fixing what’s broken, it’s about ensuring safety, reliability, and long-term performance. These systems often operate under heavy loads and demanding conditions, so even minor issues like wear, misalignment, or hydraulic leaks can quickly turn into major concerns if left unaddressed.

The first step is a thorough inspection to identify the root cause of the problem. Whether it’s damaged components, pressure inconsistencies, or structural stress, understanding the issue clearly helps in planning the right repair strategy. Replacing worn-out parts, recalibrating the system, and ensuring proper lubrication are essential to bring the system back to optimal working condition.

Equally important is testing the system after restoration. Load testing and performance checks help confirm that everything is functioning safely and efficiently before putting it back into operation. It gives both operators and engineers confidence that the system can handle real-world demands.

In the long run, regular maintenance and timely servicing play a crucial role in preventing such failures. By keeping a close eye on system health and addressing small issues early, businesses can avoid costly downtime and ensure their jacking systems remain dependable when they are needed the most.

Conclusion

Formura Offshore Services successfully executed a complex jacking system remedial project under challenging conditions. By combining technical expertise, OEM-aligned practices, and flexible project management, Formura reinforced its position as a trusted partner for offshore asset integrity and operational continuity.