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Recovery of oil as by-product of gas-storage operations
A.B. Cook, F.S. Johnson
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Abstract
Most natural gas-storage projects make use of gas reservoirs. This practice is usually desirable when gas reservoirs can be found at all desired locations. When none is available, other types of reservoirs are used. Gas is stored underground in oil reservoirs, aquifers, depleted mines, and as liquefied gas in man-made caverns. Gas storage in some oil reservoirs may have more merit than storage in other types of enclosures. Whereas there is a possibility of leakage from aquifers and depleted mines, gas can be safely stored in oil reservoirs to pressures at least as high as the virgin reservoir pressure. Gas storage in depleted oil reservoirs may result in significant secondary oil recovery. Also, gas storage in newly discovered oil reservoirs will increase ultimate oil recovery and will reduce the cost of producing the oil. In addition, the ability of most wells in oil fields to take and deliver gas is sufficiently high for gas storage operations. (10 refs.)