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DEVELOPMENT OF A SUBSEA WIRELESS SYSTEM

Objectif

To demonstrate the feasibility of preforming wireline service from a Monohull Vessel thus drastically reducing the cost of such operations.
The Basic Offshore Trial unit demonstrated the feasibility of this mode of operation.
Numerous improvements were identified as a results of the trial. These particularly concerned the subsea lubricator which displayed several undesirable characteristics of a troublesome and time-consuming nature. A more robust Derrick and compensation unit was also indicated to be desirable when operating over more complex xmas trees.
Project has been abandoned.
Wireline interventions are an accepted method of performing a wide variety of downhole maintenance, inspection and monitoring taks. These taks are normally performed either from the Platform Celler Deck or from the Deck of a Semi Submersible Work-Over Vessel in the case of subsea completions. In both cases a riser from seabed to deck (either permanent riser or temporarily installed) is used as the means of access to the borehole.
this project targeted the ability of a high-technology Field Support Vessel to be used in place of the much more expensive Semi-Submersible Work-Over Vessel.
To achieve the project objectives a design study was undertaken which defined the necessary parameters that would be required by a system.
Operational availibility; the range of tasks that could be required; the motion response characteristics and many other factors were considered.
A Basic Offshore Trial Unit was engineered and built during 1985. This basic unit was aimed at an early demonstration that the system could be successfully operated in the North Sea. The system was deployed on the British Argyll in june 1986 and successfully performed a trial operation on a Duncan well under the operatorship of Hamilton Brothers Oil + Gas Ltd.
The system comprised a Derrick and Heave compensated load and wireline units together with a subsea lubricator. The whole system was mounted on a Dynamically Positioned; Roll-Stabilised; Twin-Moonpol support vessel the BRITISH ARGYLL which is owned and operated by APT's parent company British Underwater Engineering Ltd.
Since successful demonstration of the basic unit the project has progressed. Its current status is that a commercially viable unit is now being constructed which embodies the lessons from the Basic Offshore Trial. In particular APT are totally redesigning the Subsea Lubricator element so as to provide access for both slick line and electric braided cable applications. This technology continues to be supported by oil company operators. In particular the support of Amerada Hess is to be acknowledged in the forthcoming build phase.

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

Advanced Production Technology Ltd
Contribution de l’UE
Aucune donnée
Adresse
Trafalgar House Hammersmith International Centre
W6 8DM London
Royaume-Uni

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Coût total
Aucune donnée