Abstract
ABSTRACT Buildup analyses of the JX-2 horizontal well, Prudhoe Bay, Alaska, were carried out to determine the skin factor, vertical, and horizontal permeabilities. The analysis approach, was to attempt to match analytical and numerical simulations to the data on the Log-Log Derivative plot. Analytical simulations failed to match the data while numerical simulations incorporating the gas cap were able to match the data well. More than one numerical match was found possible even for widely different formation parameters. The non-uniqueness of match is believed to be a result of insufficient buildup duration. Analytical and numerical parametric simulations were carried out to improve the understanding of the range of possible pressure transient responses from JX-2. Conditions under which non-unique interpretations can occur were identified. A comparison of the pressure transient response with and without the gas cap showed that gas cap effects exert a major influence during the Pseudo-Radial flow period. Additionally, gas cap influence cannot be properly modelled by a constant pressure boundary. Thus, multiphase numerical simulations are necessary for an accurate interpretation.
Published Version
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