This paper describes a feasibility study for pressure maintenance in the E-22 reservoir of the Ardjuna Field, Offshore Northwest Java. Results of a black-oil reservoir simulation study have been used as the basis for evaluation of pressure maintenance project alternatives.

Various operating schemes have been examined for their efficiencies in terms of recovery and cost. Alternatives considered are: 1) continued natural depletion, 2) gas injection, 3) water injection, and 4) simultaneous injection of gas and water. Production is derived from a combination of gas cap expansion, gravity drainage, solution gas drive, and water influx. The study concludes that gas injection into the gas cap will be the most efficient pressure maintenance program. Water injection only and/or simultaneous injection of gas and water would be either less efficient or economically unattractive.

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