The Rhum Field a Successful HP/HT Gas Subsea Development (Case History)
- Alastair Brown (BP plc) | Chris Farrow (BP Operating and Exploration Company Limited) | Jim Cowie (BP Operating and Exploration Company Limited)
- Document ID
- Society of Petroleum Engineers
- Offshore Europe, 4-7 September, Aberdeen, Scotland, U.K.
- Publication Date
- Document Type
- Conference Paper
- 2007. Society of Petroleum Engineers
- 1.14 Casing and Cementing, 1.6.9 Coring, Fishing, 4.3 Flow Assurance, 1.6 Drilling Operations, 5.5.11 Formation Testing (e.g., Wireline, LWD), 5.1.1 Exploration, Development, Structural Geology, 4.3.1 Hydrates, 5.6.4 Drillstem/Well Testing, 5.1.2 Faults and Fracture Characterisation, 4.1.2 Separation and Treating, 4.3.4 Scale, 2.2.2 Perforating, 4.2 Pipelines, Flowlines and Risers, 5.1 Reservoir Characterisation, 1.2.3 Rock properties, 5.2 Reservoir Fluid Dynamics, 2.4.3 Sand/Solids Control, 1.14.1 Casing Design, 2 Well Completion, 4.6 Natural Gas, 4.1.5 Processing Equipment
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The Rhum Field is a high pressure / high temperature gas accumulation in the North Viking Graben with an estimated GIIP volume of 1Tcf. The P198 licence was awarded to BP and the Iranian Oil Company (U.K.) Limited (50/50) in 1972 and is located approximately 380km north-east of Aberdeen in 115metre water depth. First gas was in December 2005 with production of 250 million cubic feet per day from 1 new development well and the re-completion of the 2000 appraisal well. The field produces via a sub sea tie-back scheme to the Bruce Field platform, 43 kilometres to the south.
Rhum was discovered in 1977 with well 3/29-2, which penetrated a thick gas bearing sequence of Upper Jurassic turbidites. This well was plugged and abandoned without testing, owing to the difficulty in testing high-pressure wells with the tools available at the time. Twenty-three years later, in 2000, appraisal well 3/29a-4 was drilled and extensively cored and logged. Finally, in 2004/5, the field was developed with 2 new wells as part of a project that has now brought the 27 year old discovery successfully into production.
Production is through natural depletion with minimum expected aquifer support. The Field Development Plan provides for the completion of three development wells, including re-completion of the 3/29a-4 well. The sub-sea wells are individually tied back to the Rhum sub-sea manifold and from there connected back to Bruce via a single 16??, pipe-in-pipe insulated flow-line, which is trenched and backfilled. The Bruce Platform processes the Rhum gas for onward transportation to St Fergus via the Frigg pipeline.
The Rhum Project used many new technologies in an innovative way in order to overcome the harsh and challenging environment of a North Sea HP/PT subsea gas development.
The Rhum Field, discovered in 1977, is located in the Northern North Sea, 380 km north east of Aberdeen and 43 km north of the Bruce platform. The field contains approximately 1 Tcf (GIIP) of high pressure (12,500 psi) , high termperature (300 degrees Fahrenheit), dry gas, and is owned by BP (50%), the Operator and the Iranian Oil Company (IOC) UK (50%).
The Rhum field has an aerial extent of approximately 25 square kms and is located in Blocks 3/24b, 3/29a, 3/29b and 3/29d, Figure 1.
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