Restoring Critical Jacking System Integrity

Author
Eden Hazard
pubslished on
January 17, 2019
category
Products
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.
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.