Possibility of Cycling Deep Depleted Oil Reservoirs After Compression to a Single Phase
- Donald L. Katz (University Of Michigan)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- July 1952
- Document Type
- Journal Paper
- 175 - 182
- 1952. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.8.8 Gas-condensate reservoirs, 5.2.1 Phase Behavior and PVT Measurements, 4.1.2 Separation and Treating, 4.1.5 Processing Equipment, 3.4.2 Well Fluid Analysis, 4.6 Natural Gas, 1.10 Drilling Equipment, 4.2.3 Materials and Corrosion, 5.4.2 Gas Injection Methods, 5.2 Reservoir Fluid Dynamics, 4.1.4 Gas Processing
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The compressing of gas into a partially depleted gas drive oil reservoir to bring the contents to a single phase miscible with gas is proposed as a process worthy of serious study. The compressed gas and vaporized oil would be recovered by cycling. This paper explores the possibility of recovering oil from reservoirs of 6,000 ft or more by this method.
Many new methods for increasing the recovery of oil from reservoirs are under consideration in the various research laboratories. One method which should be considered for recovering oil from partially depleted gas drive fields is to compress gas into the reservoir until the contents become a single phase miscible with more gas. Natural gas then may be cycled through the reservoir to recover the oil. This procedure ideally will eliminate the capillary effects of the liquid in the porous media and, should permit recoveries similar to those obtained in cycling operations, probably of the order of 80 per cent. This paper explores the information now available for the prediction of the performance of such a project and discusses the problems likely to be encountered in recovering oil by cycling.
For many years dry natural gas has been passed through oil reservoirs to recover natural gasoline which would vaporize from the oil. Recently a process of recovering more of the high boiling hydrocarbons has been described by employing high pressures at which the heavier hydrocarbons have a higher volatility. Nevertheless, this reported method does not eliminate the differential nature of the vaporization process and capillary forces are still present in the reservoir. The process under discussion in this paper would minimize differential vaporization and would remove capillary forces which are responsible for low oil recoveries. Higher gas pressure, are required to accomplish this removal of the miniscus, but it does not follow that more gas is required for oil recovery. The process is limited to reservoirs deep enough to permit the use of the required pressure - probably 6,000 ft and deeper.
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