Production Engineering Aspects of Shannon Reservoir, Cole Creek Field, Wyoming
- C.F. Gates (General Petroleum Corp.) | G.G. Brown (Mobil Producing Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1955
- Document Type
- Journal Paper
- 19 - 24
- 1955. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.7.2 Recovery Factors, 6.5.2 Water use, produced water discharge and disposal, 4.6 Natural Gas, 5.2 Reservoir Fluid Dynamics, 1.2.3 Rock properties, 2.4.3 Sand/Solids Control, 5.2.1 Phase Behavior and PVT Measurements
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Performance of the Shannon Reservoir, Cole Creek field, Wyo., is summarized. Oil has been secured largely by water drive.
Calculated pressure-rate performance based on Hurst's water-drive equation for an infinite reservoir coincides with observed performance. An empirical relationship indicates that the difference in pressure between the perimeter and the oil producing area for a given oil rate by water drive is about proportional to the cumulative oil produced. Calculated future performance, based on Hurst's equation, the pressure difference relationship, and the reservoir oil rate equation, correctly indicated limitations on maximum oil rate which were not apparent before the calculations were made.
Net formation withdrawals have been reduced to about zero by the injection of water in six wells spaced around the perimeter of the field. About three-fourths of the injected water rate merely replaces the former natural water encroachment rate; the remainder supports an increased oil rate.
Productivity indexes are being maintained at a maximum by keeping producing pressures at a high per cent of the bubble-point pressure through the use of "bubble-point pumps" and shut-in casingheads. The
maximum efficient rate of the reservoir is automatically produced thereby. Productivity indexes of wells were increased many-fold by shooting with nitroglycerin.
Indicated recovery efficiency is about 33 per cent but ultimately may he higher.
Although the Cole Creek Shannon reservoir is relatively small, it is of especial interest to the production engineer for the following reasons:
1. Reasonably complete field data have been secured throughout the 14-year life of the reservoir.
2. The limited natural water drive is being supplemented by water injection.
3. Present installations automatically produce the maximum efficient rate.
4. The reservoir has behaved largely according to engineering calculations.
5. There are enough diverse aspects of the reservoir history to warrant intense study.
This paper consists mostly of data and our interpretations of the data. For continuity and completeness the paper repeats some data given by Whitaker and Hoenshell.
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