Abstract

This paper reviews some geotechnical aspects of offshore decommissioning with the aim of highlighting the challenges and importance of understanding the geotechnical conditions early during the engineering phase of the project in order to reduce the likelihood of delays and cost overruns. Discussion is offered regarding current decommissioning practice of various types of subsea structures, moorings and pipelines/cables. Potential solutions for recovery of subsea structures using smaller vessels are presented along with a recent case study for the decommissioning of a piled subsea structure.

Keywords:
floating production system, pipeline bundle, suction caisson, overpressure, requirement, gravity, operation, mobilization, upstream oil & gas, subsea production equipment
Subjects:
Offshore Facilities and Subsea Systems, Floating production systems, Subsea production equipment
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2015. International Society of Offshore and Polar Engineers
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