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Contenu archivé le 2022-12-27

A SUBSEA COILED TUBING SYSTEM

Objectif

Coiled tubing work on subsea completions is currently achieved using semi-submersible vessels with a rigid marine riser attached to the wellhead assembly.
The coiled tubing is injected through a pressure containment device at the top of the riser against well pressure down into the well.
The project objective is to design and develop equipment to locate the tubing injector directly onto the wellhead assembly thus obviating the need for a rigid marine riser and large surface support vessel.
The system will comprise of a handling equipment for a positive deployment and controlled landing on the wellhead assembly, the coiled tubing system with marinised subsea components and a hydraulic control package.
All activities were successfully completed.
An operation using the handling frame and active heave compensation system has been successfully carried out offshore but the coiled tubing system, although called for in the customer's well servicing programme, has not been used.
The system was mobilised with the intention of backflowing a water injection well by injecting nitrogen followed by flushing of flowlines on two subsea wells. Favourable hole conditions in the subsea water injection well however, meant that use of the coiled tubing was unnecessary so the system remains for the present time, untried offshore.
The project will comprise of five major activity areas which are as follows :
Modification To Existing Coiled Tubing : After initial system design the components to be used subsea will be modified for underwater use. This primarily involves marinisation of the tubing injector assembly which will be deployed from the support vessel and landed on the subsea xmas tree. The workscope involves definition of an operations specification, environmental loading analysis, marinisation of the surface equipment design and procurement of the injector followed by an assembly and testing phase.
Deployment System : A Handling system which will include lifting, umbilical and guidewire winches for subsea and topside equipment manipulation. Positive handling (using heave compensation) on the surface vessel and soft landing of the subsea equipment on the wellhead are prime objectives. Constant tension guidewire winches will be used to accommodate vessel motions and an deploying the various control and monitoring umbilicals for the subsea equipment. The handling system will include a main lifting winch whose wire will be motion compensated for deployment and recovery of the subsea coiled tubing equipment.
For the deployment system components the development phases will include initial design, finalisation of the engineering package, procurement, assembly and testing.
ROV Support Tooling : The system will be designed to be remotely operated with subsea tasks undertaken by construction class ROV's. Some tooling design will be necessary for certain work areas. Control System : Hydraulic control of xmas tree functions, coiled tubing equipment and the handling system will be carried out from a surface control cabin. The system will include control umbilicals and hydraulic power packs. The workscope includes design, specification, procurement and testing of the umbilicals plus the surface control panels.
System Trials : Trials will be carried out, on land, to function test criticalsystem components.
These dry trials will involve mobilisation of the equipment to the trials site where intergration testing of the subsea equipment followed by hook up, function and load testing of the entire equipment package will be performed.

Appel à propositions

Data not available

Régime de financement

DEM - Demonstration contracts

Coordinateur

WHARTON WILLIAMS
Contribution de l’UE
Aucune donnée
Adresse
STONEYWOOD IND PARK DYCE
AB2 ODF ABERDEEN
Royaume-Uni

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Coût total
Aucune donnée