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Abstract

A conventional compositional model for WAG injection in a medium-viscosity oil, low-temperature reservoir like Schrader Bluff Pool in the Milne Point Unit, Alaska was developed. Compositional simulation of WAG displacement withCO2- natural gas liquid (NGL) and Prudhoe Bay gas-NGL mixtures showed that three-hydrocarbon phases formed in situ because of low temperature. The sensitivity of oil recovery in a 2D quarter five-spot pattern to relative permeability, WAG ratio, slug size was studied. Unfortunately, the spatial resolution was very low in the compositional simulations, thus leading to severe numerical dispersion. It was prohibitively time-consuming to run multi-dimensional, compositional simulations with four fluid phases on fine grids in a conventional finite-difference simulator. To solve this problem, a four-phase streamline-based compositional simulator has been developed.

RESULTS, OBSERVATIONS, AND CONCLUSIONS:

Streamline simulations of WAG processes show that the streamline method not only turns high-resolution simulation into reality but also speeds upcompositional simulation.

APPLICATIONS:

The streamline simulator can be used for miscible and immiscible injection problems with up to four phases.

TECHNICAL CONTRIBUTIONS:

Application of the first developed four-phase streamline simulator in the petroleum industry and better understanding of streamline-based compositional simulation.

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