Oil & Natural Gas Corp. Ltd. (ONGC) produces oil from
the Western Offshore fields off the coast of Mumbai, India. Rather than
decommission its fixed, jacket-type platforms dating back to the 1970s, ONGC
opted to requalify the structures as fit for extended use.
The $150-million project involved the structural assessment
of more than 265 platforms, the majority of which had exceeded their 25-year
design life. A foremost priority included the identification and delivery of
strengthening and mitigation measures for 90% of these platforms, as well as
the subsequent recertification necessary to meet industry safety requirements.
The aim was to add 10-15 years to the structures’ lifespan. Studies conducted during the analyses included dent
modeling, member-joint component strengthening, and additional pile modeling.
Each requalification not only ensured uninterrupted oil
production, but also avoided installation of a replacement platform at a net
cost of $25 million. Find out more on what was done.
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