Multidisciplinary Reservoir Characterization and Simulation Study of the Weyburn Unit
- S.A. Elsayed (PanCanadian Petroleum Ltd.) | Richard Baker (U. of Calgary) | P.L. Churcher (PanCanadian Petroleum Ltd.) | A.C. Edmunds (PanCanadian Petroleum Ltd.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- October 1993
- Document Type
- Journal Paper
- 930 - 973
- 1993. Society of Petroleum Engineers
- 5.6.3 Pressure Transient Testing, 5.5.2 Core Analysis, 5.6.4 Drillstem/Well Testing, 6.5.2 Water use, produced water discharge and disposal, 5.4.1 Waterflooding, 1.2.3 Rock properties, 5.1.2 Faults and Fracture Characterisation, 5.1 Reservoir Characterisation, 1.6.9 Coring, Fishing, 1.14 Casing and Cementing, 5.4.9 Miscible Methods, 4.3.4 Scale, 5.5.11 Formation Testing (e.g., Wireline, LWD), 5.5 Reservoir Simulation, 5.8.6 Naturally Fractured Reservoir, 3.3.2 Borehole Imaging and Wellbore Seismic, 5.6.1 Open hole/cased hole log analysis, 5.5.8 History Matching, 5.8.7 Carbonate Reservoir
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Reservoir characterization is important to EOR and numerical simulation studies, especially for complex naturally fractured reservoirs with low-permeability matrix rock. Solvent movement and volumetric sweep are controlled by fracture distribution and connectivity and by matrix permeability variation. All these factors were considered in our reservoir characterization and simulation study.
The reservoir characterization was so effective that, in a 63-well simulation study, 70% of the wells were history matched on the first simulation runs without modification to the original geologic/petrophysical data. This can be attributed to the team approach of using geological, reservoir engineering, and petrophysical input.
The Weyburn Unit, in the southeastern corner of Saskatchewan, has produced medium-gravity crude oil from the fractured, low-permeability Midale beds of the Mississippian Charles formation since its discovery in 1954. Even though the Weyburn Unit has been on waterflood for more than 26 years, a significant target for EOR, horizontal wells, and waterflood optimization remains.
The Weyburn field is located ˜130 km southeast of Regina, Sask. (Fig. 1). The productive portion of the field covers ˜180 km². The field currently has 627 producing wells and 162 water injection wells on ˜24-ha spacing.
The Midale beds of the Weyburn field were produced by primary depletion from discovery until 1964, when an inverted ninespot waterflood scheme was implemented. Since 1985, both horizontal and vertical infill drilling programs have been undertaken to optimize waterflood performance.
The Midale beds of the Mississippian Charles formation were deposited on a shallow carbonate shelf in the Williston basin. The reservoir is informally subdivided into the upper Marly and the lower Vuggy zones (Fig. 2).
The Marly is a chalky intertidal dolostone with occasional limy or limestone interbeds. Porosity in the dolostones ranges from 16% to 38%, with an average of about 26%. Matrix permeability within this reservoir horizon ranges from 1 to >100 md, with an average of <10 md.
|File Size||3 MB||Number of Pages||6|