ONGC Adds 10-15 Years Life to Existing Offshore Assets With Bentley SACS

Bangalore, September 26, 2017: Oil and Natural Gas Corporation (ONGC) started its hunt for “Black Gold” in Indian waters in 1976 and is currently operating more than 265 offshore fixed jacket platforms in water depths ranging from 25 to 90 meters. Most of these platforms had a 25-year design life, with many of them having already outlived this milestone and many more approaching it. Additionally, modifications on many of the platforms have been made due to updated design criteria or because of revamping projects executed for enhanced oil recovery. As a result, the requalification of these structures was highly important to ensure continued oil production, thus sustaining the energy supply needed for the national growth. ONGC also wanted to avoid installing new platforms at a net cost of USD 25 million per platform.

ONGCinvested USD 150 million to assess its jacketed platforms for extended “fit foruse” and strengthen the platforms as required to meet industry safetyrequirements. ONGC used SACS for design-level analysis to carry out detailedstructural analyses and SACS Collapse for ultimate strength analysis. Thistechnology became part of ONGC’s methodology for platform lifeextension/requalification, which added 10-15 years to the average life of eachstructure. 

The analysisincluded dent modeling, member/joint component strengthening, additional pilemodeling, and soil convergence, as well as extensive load modeling to recommendequipment removal if necessary. SACS and SACS Collapse, with the efficientmulti-run option, allowed multiple analyses with parametric variations to becarried out simultaneously and enabled ONGC to optimize thestrengthening/mitigation measures, saving at least 12 resource-hours perplatform. 

DineshKumar-GGM, head structures, IEOT-ONGC, India, said, “The wide range ofapplications offered under the umbrella of Bentley technology has resulted inONGC being able to manage our offshore assets much more efficiently.”

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