Abstract
Abstract Due to the retrograde condensate characteristics of the reservoir fluid, gas cycling operations were initiated in the Pegasus Devonian Field Unit No. 3 during 1963 to maximize condensate recovery. At the initial reservoir conditions of 5,400 PSIA and 203° F, the condensate yield of the reservoir fluid was 189 BBL/MMSCF. Since production began in 1952, the condensate yield has declined steadily to 25 BBL/MMSCF due to changes in fluid composition resulting from pressure depletion and injected lean gas breakthrough. In order to describe the complex mass transfer and composition changes of the mix between reservoir fluid and injected gas, a twelve component fluid characterization model was developed for the Devonian hydrocarbon fluid system using a Peng-Robinson equation of state program. This paper details how this model has been used to determine the degree of gas cycling, monitor the effectiveness of surface production facilities, and establish an efficient field development plan which will maximize the value of this property.
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