Gas Injection In City Of Inglewood Pool Inglewood Oil Field - California

American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. This paper was prepared for the 38th Annual California Regional Fall Meeting of the Society of Petroleum Engineers of AIME, to be held in Los Angeles, California, October 26 and 27, 1967. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor of the appropriate journal provided agreement to give proper credit is made. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines. The City of Inglewood Pool gas injection project, Inglewood Oil Field, California provides a 3 year case history of successful gas injection operations in a depletion type reservoir producing 290 API oil. The pool is a stratigraphic trap which pinches out abruptly upstructure. The structure dips about 300 at the crest, with dips of 600 on the flanks near the oil/water contact. The average depth to the top of the zone is 9,000 feet. The average porosity is 13.8% and the arithmetic average air permeabilities is 8.7 md. The reservoir had an original gas cap of approximately 7-1/2% of the total hydrocarbon reservoir pore volume. The original reservoir pressure, estimated at 4,350 psia, had declined to 2,800 psia prior to initiating gas injection. Injection into 8 crestal well was initiated in February 1964 at 3,800 MCF/D and 3,000 psig. Approximately 1,400,000 MCF of gas had been injected into the pool when injection was increased to 6,000 MCF/D in September 1964. To date, 5,900,000 MCF of gas have been injected with a resulting average reservoir pressure increase of 475 psi to 3,275 psia. Reservoir calculations indicated that only 12.5% of the original oil in place could be recovered by normal depletion, but that recovery could be increased to 22.8% by gas injection. Current production is 820 B/D oil, which represents a gain of 580 B/D over normal depletion. Cumulative additional oil recovery to date is about 500,000 barrels. Introduction The Inglewood Oil Field is located about 10 miles southwest of the Los Angeles Civic Center (Figure 1). The City of Inglewood Zone is the next-to-deepest zone of eight major producing intervals in the field. The sand is of Upper Miocene age (Figure 2). The City of Inglewood Pool, discovered in 1960, lies between 8,000 and 10,000 feet vertical depth. It contains 12 producing wells and 2 injection wells drilled on about 16-acre spacing. Dry gas injection was initiated in February 1964 and expended to full scale by September 1964.