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Marwell and Maxwell Oil Tools save costs in close tolerance application through stop collar design

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Oilfield Technology,

Marwell has successfully installed a tailored and cost-effective solution to replace centraliser subs for a major international oil company. The project was undertaken in close conjunction with its long-term partner, Maxwell Oil Tools.

Marwell and Maxwell Oil Tools save costs in close tolerance application through stop collar design

A 17 in. liner was required to run through a 17.562 in. ID wellhead restriction to centralise the string sufficiently in the under reamed 20 in. open hole. Marwell AS worked closely with the operator and Maxwell Oil Tools to design an ultra-slim stop collar with exceptionally high holding force for the application. The selected product was the Slimstop bonded composite stop collar.

Taking place on a redevelopment of a mature field in the Norwegian North Sea, the well consisted of a chalk formation. To achieve the cementing objectives, the stop collars were run together with a third-party bow spring-type centraliser to give the required standoff in the under-reamed open hole. The resulting close tolerance stop collar application was independently verified as being extremely robust, and the operator successfully ran the 17 in. liner through the wellhead restriction and cemented it as planned. The robust bonded-to-pipe solution was installed at the Marwell installation facility in Stavanger at a fraction of the cost of using centraliser subs.

“Offering innovation and cost savings to clients in what is a challenging environment means they can realise savings of several days of rig time. This achievement means we have the ability to turn a borderline project into an economically viable one. In this case, our design effectively solved the operator’s challenge and allowed them to successfully adopt a robust bonded-to-pipe solution at a fraction of the cost,” said Mike Williamson, Managing Director of Marwell.

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