Assessment of Cutting Technology Above Seabed for Cost Reduction Purpose

At the end of offshore structure design life, decommissioning offshore platform
should be execute as one of the legislative requirement in offshore installation.
Malaysia decommissioning activities increasing as the number of offshore platform
reach their design life approximately about 360 platforms. The execution of offshore
decommissioning need to be properly planned as the risk is huge due to the lack of
expert in decommissioning field. Decommissioning cost has taken into consideration
in project planning to increase the profit gain by the operator. The scope of this paper
is to propose cutting technology above sea bed for cost reduction purpose. Selection
of cutting technology is important to reduce the cost element involve in jacket removal.
Diamond wire saw, Abrasive Water Jet and Diver Torch are selected for the nonexplosive cutting method technology. In order to get the best cutting technology, study
of Qualitative analysis on the selected technologies based on the safety, technical, cost
and environmental impact are done. The factors are measured by indicating score of
each technology and ranked. Indirect cost of the technologies calculated and compared
which the cheapest cost is Diamond Wire Saw.