Total success for conductor centralizers on Martin Linge
Claxton developed two new concepts to fulfil the initial request, but also carried out some reviews of the available riser analysis reports to ensure that high-specification technology was necessary for the project. “By working together and really understanding what Total needed, we were able to simplify its requirements from a complex, new design to a design that we have used a lot in the North Sea. So, Total got tried-and-tested, more-efficient technology.”
The splash zone centralizer that Total and Claxton agreed on is, apart from having a simpler, proven design, also 50–70% cheaper than those designed to meet the original, more-complicated brief.
Claxton was also asked to look at the problem of centralization during spudding and to see if a design for a retrievable drill bushing compatible with the jacket conductor slots was feasible.
Claxton’s previous drill bushing experience was with those that only interface with predrilling templates. The Martin Linge project presented a new challenge in that the drillstring with the drill bushing would need to go through all the upper guides and then centralise on the lower subsea guide, which meant that a retractable design was required.
Claxton worked closely with Total throughout the design of the prototype drill bushing to ensure it would fulfil the offshore requirements. Further work to hone the device will continue during Phase 2 of the Martin Linge project.
“This is another example of how an original idea develops when you work with a client and consider their needs and opinions,” says Vicens.
Claxton Conductor Centralizers Milestone
This project- and client-specific approach has been key to the Martin Linge contract, but it has also helped Claxton reach the milestone of installing more than 5,000 centralizers worldwide since 1998.
“During more recent years, we have been quite successful at getting the big jobs. I think this is down to working closely with our clients and getting a better understanding of what they need. We also try to engage with them at the right time. Instead of just waiting for the requirements to come through to us, we try to understand the specific details of each project at an early stage and to ensure that clients understand the importance of getting the centralizer design right at the start.”
The need for unique designs stems from the different requirements around the world. Some existing clients may simply want “more of the same”, whereas others are looking to focus on meeting specific challenges arising from a particular development.
“That is why we create bespoke centralizers for every client. We design each one for a specific platform to maximise the protection it offers to the well conductor,” Vicens concludes.
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