Reservoir Management in a Deepwater Subsea Field--The Schiehallion Experience
- Alastair H. Govan (BP Exploration Europe) | Tim Primmer (BP Exploration Europe) | Cameron C. Douglas (BP Intl. Ltd.) | Neil Moodie (BP Exploration Europe) | Merv Davies (BP Exploration Europe) | Ferry Nieuwland (BP)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2006
- Document Type
- Journal Paper
- 382 - 390
- 2006. Society of Petroleum Engineers
- 5.6.10 Seismic (Four Dimensional) Monitoring, 5.6.4 Drillstem/Well Testing, 5.6.5 Tracers, 2.4.3 Sand/Solids Control, 4.1.5 Processing Equipment, 4.3.4 Scale, 5.1.5 Geologic Modeling, 5.2.1 Phase Behavior and PVT Measurements, 5.1.7 Seismic Processing and Interpretation, 3.3.1 Production Logging, 5.4.1 Waterflooding, 4.1.2 Separation and Treating, 1.6 Drilling Operations, 5.5.11 Formation Testing (e.g., Wireline, LWD), 5.1.2 Faults and Fracture Characterisation, 5.7.2 Recovery Factors, 5.1.9 Four-Dimensional and Four-Component Seismic, 4.5.3 Floating Production Systems, 5.5.8 History Matching, 5.6.3 Pressure Transient Testing, 6.5.2 Water use, produced water discharge and disposal
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The Schiehallion field has experienced many reservoir management challenges since first production in 1998. Dynamic data such as formation pressures, pressure-transient analysis, interference testing, tracer analysis, and 4D seismic need to be interpreted with great care—Schiehallion has examples in which the data have been invaluable and others in which the data are ambiguous or misleading. It is essential to integrate several data types to obtain reliable conclusions. This paper describes some of the highlights and pitfalls experienced in Schiehallion.
The Schiehallion field is situated on the Atlantic margin of the United Kingdom Continental Shelf (UKCS), to the west of the Shetland Islands, in water depths of approximately 400 m (Fig. 1). Together with the smaller satellite Loyal field, it is produced through subsea horizontal wells tied back to the Schiehallion floating production, storage, and offloading (FPSO) vessel. The combination of water depth with strong winds and currents, creating waves up to 30 m high, makes this one of the most hostile environments in the world for hydrocarbon production.
The reservoir is a deepwater turbidite of Tertiary age deposited in the Faroe-Shetland basin (Ebdon et al. 1995; Lamers and Carmichael 1999; Mitchell et al. 1993; Morton et al. 2002) and showing varying degrees of channelization in different parts of the field (Fig. 2). Permeability is generally good (approximately 600 md), but the low reservoir depth (2000 m), low gas/oil ratio (GOR) (340 scf/bbl) and limited aquifer provide little natural energy, so water injection is critical. Seismic data quality is mostly very good.
|File Size||3 MB||Number of Pages||9|
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