Skip to content

What the Middle East can learn from the North Sea platform slot recovery operations

Lifecycle stage
Late-Life

 

The Solution:

Claxton developed a recovery method for the 20-in. riser that provided an efficient means of recovery and enhanced the riser’s integrity during retrieval – preventing any fatigue connectors from parting.

What the Middle East can learn from this project:

Nick Marriott explains, “Across the Middle-East and Arabian Gulf over 3,000 well conductors are over two decades old – many of these could have fatigued or corroded connectors in place that may part during recovery. In some instances the conductors themselves may have integrity issues. Using the methodology Claxton developed for Beryl B, the risk of this issue can be mitigated significantly,  improving operational safety in the process.”

Vertical views of a conductor slot recovery operation – showing a Claxton positive grip tension ring (right) securing the conductor during retrieval and a Claxton single drilling unit (left)

Pictured: Vertical views of a conductor slot recovery operation – showing a Claxton positive grip tension ring (right) securing the conductor during retrieval and a Claxton single drilling unit (left).

TYRA EAST RECOVERY FOR MAERSK

  • Project scope: Rigless recovery of multi-string conductor and stuck bottom hole assembly (BHA)
  • Claxton’s role: Development of recovery methodology, diamond wire cutting, subsea cutting of BHA, bespoke whipstock, work deck and false rotary with load spreader beams. Offshore crews.
  • Key equipment used: Diamond wire saws, drilling and pinning equipment, Claxton conductor recovery package

Project Overview: 

During installation of a well, the 15m long bottom hole assembly (BHA) had become stuck across the conductor – meaning the well was never completed. Claxton was called in to cut and recover the BHA, recover the well conductor and supply a bespoke whipstock to interface with the remains of the BHA and well.

The Solution:

Claxton supplied a fleet of cutting equipment, drilling and pinning tools and bespoke ‘recovery interface’ which contained load spreader beams and a ‘false rotary’ which enabled cutting and recovery of the conductor in sections. Claxton also developed a unique whipstock which could interface with the remains of the old well despite uncertainty about the orientation of the remains of the BHA. All of these activities were carried out without calling a rig on location.

The method developed by Claxton’s engineers was so successful the project was completed 4 days ahead of schedule, despite time lost waiting on weather.

What the Middle East can learn from this project:

Nick Marriott continues, “The key thing to take away from this project, is that even complex challenges can be overcome without resorting to the expense of a jack-up rig. Specialist slot recovery suppliers like Claxton can bring together the expertise and equipment together to ensure success.

A Claxton 300te tension ring securing the conductor during the Tyra East project.

Pictured: A Claxton 300te tension ring securing the conductor during the Tyra East project.

PLATFORM CHALLENGES

Every recovery is unique and throws up its own challenges, meaning an experienced supplier is required to engineer a solution in most instances.

Claxton has invested in a unique spread of proprietary cutting and recovery tooling and has developed a cutting and recovery methodology that is field proved (over 280 cutting projects and counting), cost-effective and safe.

Download our case study pack today to see how slot recovery from Claxton can be used to free up old and underperforming slots on your platforms.

Slot recovery case study pack
E-book download

Slot Recovery Case Study Pack

Discover how Claxton’s engineers, machinery and methods have assisted with slot recovery operations all around the world in our case study pack.

Download