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The Three Graces: On Time, On Budget and on Station

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AVEVA World Magazine Article Reprint 2015 | Issue 2 The prêt-à-porter platform With a production capacity of 80,000 b/d of oil and 5.7 MMcm/d (200 MMcf/d) of gas, Delta House will operate in an average water depth of 1,372 m (4,500 feet). The reservoirs themselves range in depth from 3,658 m to 5,629 m (12,000–18,500 feet). Delta House will operate most efficiently with crude ranging from 28° to 37° API, with some reduction in capacity outside of this range. With the platform designed before well characteristics were defined, there was a possible risk that the flow rate could exceed the nameplate capacity of 80,000 b/d. However, LLOG's cost-benefit analysis revealed that if the required processing capacity was exceeded, it would be more economical to temporarily curtail production, expand the existing unit, or even build a second production platform. Conversely, if the flow rate was less than expected, the company could lease out the spare capacity, allowing other producers to tie their wells into the FPS. AVEVA PDMS: enabling technology In order to make this strategy a success, LLOG Exploration, Audubon Engineering Solutions, and EXMAR Offshore adopted a flexible 'one size-fits-most' design approach so that the platform would be versatile enough to handle a wide range of hydrocarbon profiles. And to help them achieve this on such a demanding timeline, they used AVEVA PDMS™. 'One of the primary business benefits of AVEVA PDMS is increasing our capability for multi-disciplinary design on large projects,' said Denis Taylor, Managing Partner of Audubon Companies. 'CAD systems have limitations in project size and speed; and as the project grows, the model becomes slower and more prone to crash and hinder progress. This invariably seems to happen just before a critical milestone. With its own 3D graphics engine and a specialised database, AVEVA PDMS handles big projects very well, allowing us to maintain progress throughout the life cycle of the project.' Denis also explained how Audubon Engineering Solutions' use of PDMS opens the door to working with larger clients who prefer, or even mandate, that design be done in PDMS, a proven software for offshore design, construction, and visualisation. 'To meet the aggressive schedule of this project, we kicked off the design of all major modules and deck areas simultaneously,' added Marcus Martin, Project Manager at Audubon Engineering Solutions. 'The work was split between our Houston and New Orleans offices by deck area and process, whereby each office had vertical scope, including project management, engineering, design, and procurement. This would normally be very difficult to interface, but AVEVA PDMS enabled us to execute the design seamlessly across the multi-disciplinary teams in the two locations. Using one live PDMS model was critical to achieving this, and because any design team member in any office could see the work progress in real-time, it minimised errors, clashes, and rework.' Time-saving strategies Many offshore platforms are designed in tiers. So if one piece on a lower level needs rework, systems on higher levels cannot be installed, which can often delay the construction process. Using a design philosophy employed on Who Dat – another platform operated by LLOG in the Gulf of Mexico – Delta House was designed as a single level, with most of its processing equipment installed on the main deck. In almost every instance, performing work on systems and components in the construction yard instead of on the platform is a safer and more economical option. So Audubon Engineering Solutions designed the topsides to allow for this. The onshore work included fitting of all the piping and cabling, thus enabling the completed deck to be lifted and set on the hull with minimal work to complete integration. 'One of the primary business benefits of AVEVA PDMS is increasing our capability for multi-disciplinary design on large projects. CAD systems have limitations in project size and speed... With its own 3D graphics engine and a specialised database, AVEVA PDMS handles big projects very well, allowing us to maintain progress throughout the life cycle of the project...'

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