26 EXPLORATION/DRILLING/FIELD SERVICES
A slight variance at one
TLP project saw the grout hose (‘tail’) deployed at the end of a drill string that was assembled over the side of the vessel of execution. A drill collar was used at the bottom to minimise movement of the rigid ‘string’.
While the work vessel and support services are a major influences on the type of hose deployment scheme used, because of the deck space required for winches or other methods of hose storage and deployment. The method of
Fig. 2. Here the ROV opens the basket door and pulls the support items out by a ‘doglead’. ➠
going to perform its function. Access and viability are the main criteria for the connections to be made successfully.
Steel wore down lines
While self- supporting hoses may be produced specifically for this type of work, to date they have generally not been used because of cost and limited application makes them an expensive asset. Hence steel wire or polypropylene down lines have been used to support, deploy and recover the grout hose to/from the deck of the execution vessel.
mdeployment becomes more critical for water depths of 1500 metre and more. It is critical at any water depth to
consider the ability of the ROV to interface with grout hose tail.
Applications
The ROV interface system of grouting by attaching a hose to a subsea connection or receiver at any depth. The technique has been very effective and has been widely used on many projects over the past 25 years. Applications include pile grouting, grouting of templates, and jackets, under base grouting to gravity structures, together with maintenance and repair of clamps and braces to structures.
Industrial fabrics
ULO commenced providing the service of utilising industrial fabrics to create a shape or form to contain a cementitious grout in 1964 for the civil construction industry. With the major discovery and development of oil in the North Sea in the late 1960s. The use of fabric formwork was seen as a major development for utilisation by the offshore oil industry, to support subsea pipelines. ULO formed a joint
Fig. 3. The remotely operated vehicle inserts the stick underneath the pipeline.
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venture and established a base in Aberdeen to provide a service in this area, and the name 'COLOS' became synonymous with the oil
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