Deep Panuke Project Description - Encana

is much more weather-dependent than using a floating hull type installation and requires a calmer seastate. This could impact the project by adding cost and time for schedule impacts due to unfavorableweather. The cost of the jack-deck is also more expensive than other solutions and leasing options werenot available. As a result of the economic disadvantages compared to the jack-up solution, this optionwas rejected.Two approaches for executing the jack-up concept were investigated: 1) build a new jack up-hull to a‘harsh environment’ drill rig specification to accommodate a new purpose-built topsides or 2)refit/modify an existing harsh environment MODU to accommodate a new purpose built topsides. Thejack-up structure was selected as the best option for the Project, the final concept of a new build or refittedjack-up structure will be confirmed during the MOPU bid competition.2.10.2.3 Topsides TypeThe type of topsides for the revised Deep Panuke Project has not yet been confirmed. It will be largelydependent on the hull design of the jack-up structure. This design will be conducted by the MOPUcontractor, selected through a competitive bid process, who will engineer all elements of the MOPU,including the topsides.2.10.2.4 Total Number of PlatformsOffshore installations are generally designed to be built as the largest components possible to maximizeconstruction, hookup and commissioning activities onshore, which greatly reduces cost. Multiplestructures are used when the size of the structure exceeds lifting capabilities for heavy lift vessels orthere are other specific requirements that dictate the use of multiple platforms. As per the Project designbasis for the approved 2002 CSR, the preferred development alternative for number of platforms wasthree separate platforms for wellheads, processing, and living quarters/utilities based on conceptdeliverability criteria, reduced drilling and installation flexibility, as well as safety.For the revised Project, the size of the topsides required for the revised 8.5 x 10 6 m 3 /d [300 MMscfd]production capacity is well within the weight and size limitations for placement on one jack-up typestructure. However, EnCana had specific concerns regarding personnel safety offshore because of thepresence of H 2 S in the fluids stream. A twin-platform arrangement employing a production platform andseparate bridge-linked accommodations and control room platform was investigated, but was found toincrease capital cost significantly.Deep Panuke Volume 4 (Environmental Assessment Report) • November 2006 2-66