This paper is intended for use as general information pertaining to the extraction of crude oil from partly depleted oil-bearing strata, by the use of compressed air and natural gas as repressuring mediums. Its scope is limited to various properties that are producing from the “Corniferous” formation of eastern Kentucky. The writer has attempted to avoid theoretical assumptions as far as possible so that the paper might be readable to those who are interested in the phases of actual operation. Operations of various individual projects are described in detail as to their histories from the beginning of repressuring to the present. Discussions relating to injection volumes and pressures with reference to core analyses are based on first-hand data.

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