An Evaluation of Gas Injection in the Emery West Pool, West Coyote Field, California
- Sheldon F. Craddock (Standard Oil Co. of California)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 1956
- Document Type
- Journal Paper
- 25 - 30
- 1956. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 2.2.2 Perforating, 1.6 Drilling Operations, 4.1.6 Compressors, Engines and Turbines, 4.6 Natural Gas, 4.1.5 Processing Equipment, 4.2 Pipelines, Flowlines and Risers, 4.1.2 Separation and Treating, 5.5.2 Core Analysis, 5.4.2 Gas Injection Methods, 2.4.3 Sand/Solids Control, 5.2.1 Phase Behavior and PVT Measurements
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The Emery West pool provides an 11-year case history of successful gas injection operations in a depletion type California reservoir producing 32° API oil. The original oil in place was 50 million bbl. Reservoir calculations indicate that only 23 per cent of this oil would have been recovered by normal depletion, but that 33 per cent will be recovered by gas injection operations. This is an increase if 5 million bbl of oil recovery by gas injection. In addition 3,250,000 bbl of natural gasoline and LPG, not recoverable by normal depletion, will be recovered as a result of gas injection. This is an increase of over 200 per cent in the expected natural gasoline and LPG recovery.
Introduction and History
After 11 years sufficient historical data is available on the Emery West pool to predict with some confidence the ultimate benefit from gas injection. The early history of the pool and the details of the injection operations have been adequately presented in a previous paper and are, therefore, only briefly summarized herein. The purpose of this paper is to review the performance of the pool to date, to present the results of reservoir calculations predicting the future production, and to summarize the benefits of gas injection.
The Emery West pool was discovered in 1930. Development proceeded gradually and the basic well spacing pattern was essentially completed in 1943. There has been no drilling activity subsequent to 1943 except in the year 1952. In that year seven small producers were completed at the west end of the pool.
Gas injection was started in July, 1944. Ten MMcf/D of gas was injected into the pool from 1944 to 1949 when injection was increased to 20 MMcf/D to provide virtually full pressure maintenance. Injection has continued at 20 MMcf/D since 1949.
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