DOF Subsea UK, a subsidiary of DOF Subsea, has secured a decommissioning contract with HESS in the Ivanhoe/Rob Roy Field, North Sea. The project will last for approximately 21 days and is scheduled to start in Q3 2011.
The Ivanhoe and Rob Roy fields are located approximately 120miles northeast of Aberdeen, in Block 15/21A of the UK Sector of the North Sea in a water depth of approximately 140m. The Hamish field is located in UK Block 15/21B but its single producing well is located in UK Block 15/21A and forms part of the Rob Roy wellhead cluster.
A distance of approximately 2miles separates the Ivanhoe and Rob Roy fields. Located centrally between the Ivanhoe and Rob Roy fields is an anchored semi-submersible floating production facility (FPF), designated the AH001. In both the Ivanhoe and Rob Roy fields, the numbers of subsea wellheads are grouped around central subsea production manifolds Ivanhoe (IVPM) and Rob Roy (RRPM). Connection of the wellheads to IVPM and RRPM is made by means of Coflexip flexible flowline jumpers and electro-hydraulic control bundles. The production manifolds are connected in turn, by means of flexible flow and control lines, to a riser base manifold (RBM) located on the seabed 300m to the north-northwest of AH001.
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May 25, 2011; Image:Hess