부산대학교 도서관

The water-drive N.E. Hitchcock Frio 'A' reservoir was produced as a conventional gas reservoir from 1958 through 1982. By 1980 all but one well had watered out and been plugged and abandoned. The reservoir management strategy shifted to co-production in 1983 with the reentry of two wells and recompletion for high-volume brine production. Production from 1984 to 1986 was limited by the 10,000-STB/d tidal disposal permit. Success in disposal well research in 1987 made higher brine rates possible, averaging 20,000 STB/d of brine for the years covered by the report. Resultant drawdown to 3410 psia, 450 psi below the trapping pressure, clearly resulted in mobilization and production of trapped gas. Cumulative production from June 1987 to March 1991 has included 3.8 billion SCF of gas, 0.15 million barrels of oil, and 21.9 million barrels of brine. The primary IGT achievements during these 3 years have been to provide accurate measurements of produced gas, brine, and oil for five wells, definition of the factors that control the injectivity of disposal wells, the specification of well completion and surface facility design to minimize operating costs, and definition of technical factors relevant to the impacts of disposal well life and corrosion upon economics. The chemical and physical analyses that formed the basis for the engineering are presented.