Unique solution for one of the smallest platforms in the North Sea

horne-wren-decom

Today, an increasing number of North Sea fields are approaching the end of their useful economic lives. Operators are now seeking to reduce their asset stock and remain profitable at the same time.

The Problem

When Tullow Oil approached Claxton in April 2016 about the well abandonment of the Horne and Wren Platform in the Southern North Sea the technical challenges arising from the absence of a rig, limited crane facilities on the platform, the small 8m x 8m weather deck, and the use of a JULB (jack-up lift barge) were quite unique.

The size of the platform is one of the smallest of its kind in the sector so the scope of work to mitigate the challenges faced is not something many can help with.

Our experience, coupled with extensive in-house tailored engineering capabilities and a proven record of managing successful projects, made Claxton the confident choice for this well abandonment campaign.

The Solution

Completed within 18 operational days, Claxton was responsible for the 5.1/2” tubing cut verification, tubing recovery, sub-mudline abrasive conductor severance, conductor cut verification and the subsequent multi-string recovery from the two wells.

Due to the small footprint of the Horne and Wren platform, as well as using our latest evolution of the ‘SABRE’ abrasive cutting system we developed a full, bespoke, light weight work platform which included a hydraulic proving system and a utility crane to ensure self-sufficiency in handling our equipment.

Proving of the tubing and conductor cuts were also completed with the same system, enabling us to reduce equipment, time and money spent for the client.

Claxton also developed a bespoke tubing laydown frame that allowed the quick and safe laydown of the severed tubing in a controlled manner plus bundling for ease of backload.

The Results

Claxton’s decommissioning, design engineering and offshore teams worked closely with its supply chain and the operator to successfully abandon the two wells. Rob Horton, project engineer, Claxton, said:

We were delighted to work on this campaign and we were able to react quickly and effectively on a challenging scope of work. Our fast responsiveness to the initial enquiry and subsequent mobilization of the entire work package enabled a positive outcome to this project. The supply of bespoke engineered items and Claxton’s in-house design and manufacture of the light weight work platform was particularly very well received by the client.

If you would like to view the full case study as a PDF, you can do so here.

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