Pat OConnor's scientific contributions
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Publications (5)
As part of an early engineering study, a conceptual design of aproduction and drilling concrete gravity-based structure (GBS) for the West Bonne Bay (WBB) field offshore Newfoundland is compared with Hibernia's as-built results. The optimization of the WBB structure shape and dimensions allowed moderate steel reinforcement to be used and more than...
A concrete gravity based structure (GBS) which supports production and drilling facilities, over 1 million barrels of oil storage, and has been designed to withstand iceberg and 100 year return period wave loads in the Grand Banks offshore Newfoundland. A comprehensive structural analysis and design has resulted in moderate reinforcement and post t...
Amoco has several hundred platforms located worldwide that require underwater inspections on a regular basis. Because of the high cost of underwater inspections, Amoco has developed a risk-based process to more effectively implement inspection resources. The process identifies which platforms expose Amoco to the greatest risk and which platforms ar...
Design of steel offshore structures has traditionally been based on elastic analysis to determine the distribution of forces through the structure, for an envelope of design cases. Checks are then performed on a component basis to ensure that no element of the structure fails to meet the governing criteria. Uncertainties in estimating the design lo...
Reuse of Gulf of Mexico platforms is common practice if the facility is also destined for the Gulf of Mexico. However, reuse of a Gulf of Mexico platform in the North Sea is uncommon. An existing Gulf of Mexico platform installed in 1990 in 303 ft water depth was evaluated for reuse in the North Sea. While the water depth was similar at both sites,...
Citations
... Refs. [9], [10], [11], [12]). Specific inputs to the operators as well as specific inputs to the platform's location may be accounted for in defining these rules. ...
... Increasingly, operators are adopting risk-based strategies for integrity management (Craig et. al. 1994 and DeFranco et. al. 1999) to optimize the focus of valuable resources whilst ensuring HSE risks are maintained as low as reasonably practical. Amoco, in the North Sea, had a risk-based underwater inspection program approved by the certifying authorities in the mid eighties. BP, in the Gulf of Mexico, has had a risk based SIM strategy approved by the US regulato ...
... To date, developments have been limited to the Jeanne d'Arc Basin, which has water depths up to 120 m, 95% probability of exceedance level values for icebergs mass and velocity of one million tonnes and 0.80 m/s respectively, and an iceberg areal density in the order of 1.0 × 10 -4 per km 2 . The Hibernia GBS is designed to withstand impacts by large icebergs (design and safety level icebergs of 1.4 million and 6 million tonnes respectively, Blanchet et al., 1999). The Terra-Nova (Lever et al., 2001) and Whiterose (Norman et al., 2008) FPSOs are designed to disconnect and move off site if an approaching iceberg cannot be managed through towing. ...
