Objective
To provide detailed computerised procedures for the safe and reliable application of explosive cutting techniques to the removal of steel offshore jacket structures. These procedures incorporate both theoretical and practical input from a number of sources and can be used to provide designs for the essential elements of removal systems.
Compilation and interrogation of a database of all North Sea UK sector fixed structures revealed that the use of explosive shaped charge cutting is most beneficial for the removal of jackets which stand in greater than 100 m of water and which weight in excess of 800 t.
This will involve the use of explosive shaped cutting charges in open water. The potential market in this area was found to be significant, and analysis showed that the potential for jacket removal using shaped explosive charges will be greatest in the period 1995-2009.
A review of state-of-the-art underwater initiation methods has been conducted. The reliable initiation of charges underwater has two main requirements based on the disruptive effects of through water shock waves caused by underwater explosions. The first of these is that charges in close proximity are initiated simultaneously. Secondly separate groups of charges should be initiated at intervals of long enough duration to prevent constructive interference of shock waves but of short duration to prevent shock wave disruption from other charge groups.
Based on this methods of initiation involving the use of detonating cord, ordinary electric detonators, exploding bridgewire detonators and remove acoustically initiated firing modules are being assessed for suitability.
Final section of initiation method will involve the trade off reliability, ease of use, cost and complexity.
Detonation simulation sofware has been developed and is extended to account for explosion shock effects.
The project is conducted in two phases :
Phase 1 covered a review of essential results from the earlier EEC supported project EXPLOCUT and identified areas requiring further detailed attention. This has taken into account developments in high technology equipment, such as ROVs, and the evolution of legislation affecting decommissioning.
Phase II has concentrated on detailed safe and reliable operating procedures to help design the key elements of the removal system, with special emphasis on detonation systems and procedures. Guidance is given on the implications to structures,
vessels and the environment, of these procedures together with methods to allow for their effects. The analysis tools are in the form of interactive computer programs with sophisticated graphical output.
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
GU2 5RE Guildford
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.