Numerical Model

A hypothetical reservoir was considered by adapting CO2 injection data from the Wasson field (Hsu et al., 1997). The model consists of 7x7x3 grids. The injector was located at the centre and four producers were in the four corner grids representing a typical 5-spot injection pattern.

Twelve components (C1-C29, CO2, NO2) were considered. Other reservoir, rock and fluid properties used as simulator variables are given in Table 1. Relative permeabilities for oil, gas and water phases were obtained from Hsu et al. (1997).

Table 1. Reservoir, rock and fluid properties used as simulator variables.

Properties

Table 1. Reservoir, rock and fluid properties used as simulator variables.

Properties

Depth

5200 ft.

Average porosity

12%

Permeability

5 md

Net thickness

460 ft

Reservoir temperature

110 oF

Oil gravity

33 API

Min. miscibility press.

1300 psi

Reported minimum miscibility pressure (MMP) values for Wasson crude oil range from 1250 to 1400. For pressures less than 0.9 times the MMP the displacement is treated as immiscible, while for pressures equal to or greater than the MMP the displacement is assumed miscible. Note that the runs were performed after a long water-flooding period.

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