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Objectives/background

• To deliver a suitable landing string for BP’sQuad 204 development in the North Sea

• This was a technically challenging scope ofwork due to the rig BOPconfiguration/orientation as well as theunique completion/installation methods andbespoke SPS interface – this was to suitBP’s rig of convenience which was a newsemi-submersible that had been optimisedfor drilling operations and harshenvironments

• A dual bore vertical xmas tree (VST) solutionwas selected by BP

Expro Excellence

• Expro’s long-standing relationship and trackrecord using similar technology, allowed theSubsea team to use previous experienceand lessons learnt to ensure completecompliance with the customer’s expectationsfor the project

• Engineering work was undertaken to providea landing string that fitted the BOP withoutcompromising our customer’s specificproject requirements, nor reducing thelanding string functionality

• Re-engineering work resulted in the creationof a combined Integral Slick Joint (ISJ) andTubing Hanger Running Tool Adapter(THRTA), reducing the overall landing stringassembly length so to accommodate the rigBOP dimensions and configuration

• Production and annulus accessrequirements, along with full helix orientationand BOP and SPS interface challengeshighlighted the unique features within Expro’sbespoke landing string

• Engineering analysis for FMECAs, stressanalysis and multiple GRAs to account forvarious scenarios were undertaken

Value to client

• Expro’s modular/flexible subsea systemallowed use of a rig of convenience

• Cost-efficiencies due to a reduction inequipment complexity:

– Monobore landing String

– Integral Slick Joint

• No requirement for dual bore riser due toExpro’s technical solution, single completionstring deployment, full well control inclusivewithin THOJ/orientation helix arrangement

• Accelerated timeline achieved within ninemonths, in line with rig delivery

/ Expro Excellence

Expro provides bespoke subsea system forBP’s Quad 204 development, increasingfeatures despite decreasing size

Subsea

Expro added value with a dual bore VST configuration that allowed:

• Orientation helix for BOP alignment included in the system (full well control anddisconnect features were not compromised)

• Deployment with monobore tubing, eliminating the need for dual bore riser• Primary barriers allowing well flow clean-ups prior to the installation of the dual borexmas tree

• Provision of dual bore access for manipulation of the annulus and mechanical accessfor intervention

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