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Log in to your subscription Username. Peer reviewed only Published between: Published from year: and Published to year: Advanced search Show search help. Rock Mechanics Symposium and 5th U. Offshore Technology Conference Disciplines 4. Abstract The Terra Nova wellheads are sited in depressions "Glory Holes" made in the seabed to protect the wellhead equipment from iceberg impact. This paper describes the construction of the Terra Nova Glory Holes including the choice of protection system, the choice of excavation method, onshore preparation and offshore operations.

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Terra Nova switches technologies for excavating glory holes

A glory hole in the context of the offshore petroleum industry is an excavation into the sea floor designed to protect the wellhead equipment installed at the surface of a petroleum well from icebergs or pack ice. An economically attractive alternative for exploiting offshore petroleum resources is a floating platform ; however, ice can pose a serious hazard to this solution. While floating platforms can be built to withstand ice loading up to a design threshold, for the largest icebergs or the thickest pack ice the only sensible alternative is to move out of the way. Floating platforms can be disconnected from the wellheads in order to allow them to be moved away from threatening ice, but the wellhead equipment is fixed in place and hence vulnerable. The keel of an iceberg or pack ice can extend far below the surface of the water.
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Our activities include dredging, offshore contracting and marine services, including heavy marine transport, towage and salvage. Boskalis operates in the ports, offshore energy and infrastructure markets. These markets anticipate structural growth over the longer term as a result of several key global trends. We strive to inform our stakeholders as completely as possible and to provide insight into the strategic direction and performance of the company. Read more about our policy, strategy, reporting, and CSR case studies.
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