Field Development of the Scapa Field: A Marginal North Sea Field
- H.K. Chen (Occidental Petroleum (Caledonia) Ltd.)
- Document ID
- Society of Petroleum Engineers
- European Petroleum Conference, 16-19 October, London, United Kingdom
- Publication Date
- Document Type
- Conference Paper
- 1988. Society of Petroleum Engineers
- 5.1.2 Faults and Fracture Characterisation, 5.1.1 Exploration, Development, Structural Geology, 5.6.4 Drillstem/Well Testing, 5.5.11 Formation Testing (e.g., Wireline, LWD), 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics, 2.4.3 Sand/Solids Control, 1.6 Drilling Operations, 5.2.1 Phase Behavior and PVT Measurements, 5.3 Reservoir Fluid Dynamics, 4.1.5 Processing Equipment, 5.8.5 Oil Sand, Oil Shale, Bitumen
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Chen, H.K., Occidental Petroleum (Caledonia) Ltd.
The Scapa Field, North Sea was discovered in 1975. The field is developed with an integrated production/injection subsea template system, tied production/injection subsea template system, tied back to the main Claymore platform. Subsea oil production began in November 1956, only 14 months production began in November 1956, only 14 months after Annex `B' approval. The encouraging results of the extended production test from a deviated platform well and appraisal wells in 1984 and 1985 platform well and appraisal wells in 1984 and 1985 formed the basis for the field development. The continuous downhole pressure recording, extensive RFT measurements and other data gathering programmes are essential for successful development programmes are essential for successful development of a complex marginal field. The estimate of the recoverable oil has been increased by 25 million barrels (4 million M3). The field development to date owes its success to the combined efforts of a multi-disciplinary team, which resulted in the optimum placement of wells. Although marginal in size the development success to date has resulted in am economically healthy project.
The Scapa Field is located in United Kingdom offshore North Sea block 14/19. The field was discovered by well 14/19-9 in July 1975. This well encountered 37 ft (11 m) of net oil sand and tested 1,260 bbl/D (200 m3/d). In early 1981, an exploration well 14/19-15 was drilled in the northern margin of the field. The well intersected 90 ft (27 m) of net pay and tested +/- 3,500 bbl/D (556 m3/d) from 3 zones. No oil-water contact (OWC) was observed in these wells.
In early 1984, a long-term production test was conducted from a deviated well drilled as a twin to 14/19-15, from the Claymore platform. Following the encouraging results of the production test and drilling of two successful appraisal wells in 1984 and early 1985, a decision was made to develop the Scapa Field using an existing platform well, an 8 slot subsea production template and up to 4 off-template well locations. The subsea template, located about 2.8 miles (4.5 km) south-west of the existing Claymore platform, was installed in the summer of 1986.
The Scapa Field is a small and synclinal structure. The reservoir unit is the Lower Cretaceous Scapa Sand Member, with average net reservoir of about 100 ft (30 m). The estimated recoverable oil is 65 million barrels (10 million m3). The cumulative oil production at the end of April 1988 was 15.6 million barrels (2.5 million m3).
This paper reviews the results of appraisal wells and the extended production test, and discusses the experience gained from these events. The paper also demonstrates how the continuous paper also demonstrates how the continuous downhole pressure data obtained from the subsea and platform producers, and data from the new wells being drilled was used to guide the first phase of the development plan. phase of the development plan. The field performance to date and uncertainties associated with this small field development are also discussed. Finally, the paper illustrates the importance of the team effort and accurate data acquisition during the exploration and appraisal phase, and the lessons learned from the first phase of field development.
The Scapa Field lies in the structural saddle between Claymore high and the Halibut shelf within the western margin of the Witch Ground Graben (Figure 1). The Scapa Field is a south-east plunging syncline, with Scapa reservoir onlapping plunging syncline, with Scapa reservoir onlapping on to the Claymore high to the north.
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