The Oil and Natural Gas Company Limited made USD 1 million in modifications to an existing wellhead platform to enhance production from
a field located in the Indian offshore region. The company’s initial structural integrity assessment revealed stressed members and joints,
which required mitigation and strengthening measures before the modifications could be made.
Once the structure was strengthened, additional risers and associated topside facilities were incorporated on the platform. Using SACS to
perform the structural integrity analysis saved computation time and effort. This shortened the study phase and allowed the project to be
delivered in less time. The software also helped to ensure that the structural jacket platform complied with Oil Industry Safety
Located in the South China Sea where the average water depth is 1,500 meters, the Liwan 3-1 field is the first deepwater oil and gas field
in China. Offshore Oil Engineering Co., Ltd., performed detailed design for the CNY 1.2 billion Liwan 3-1 natural gas center platform and
submarine pipeline. For analysis and design, the company replaced manual strength analysis with automated technology based on SACS
The jacket, which was 189. 5 meters deep, 201 meters high, and weighed 31, 126 tons, was modeled and loaded using SACS, and imported
into MOSES for analyzing the launching motion. The final load was imported into the structural model for strength checking. The analysis was
completed by one person in less than two days. The technology reduced project delivery time by one month and costs by CN Y 10 million.
Offshore Oil Engineering Co., Ltd. | China
Liwan 3-1 Jacket Design
Oil and Natural Gas Company Limited | Mumbai, Maharashtra, India
Structural Integrity Assessment of a Typical Wellhead Platform