Semi-compositional simulation of hydrocarbon reservoirs

Details Semi-compositional simulation of hydrocarbon reservoirs Semi-compositional simulation of hydrocarbon reservoirs

1995-10-10

1998-01-20

Teska, Kevin J.

Boots, shoes, and leggings

G06T 1750

Patent

active

057107262

ABSTRACT:
A computer-operated method and corresponding system for simulating a reservoir to provide inputs to a surface model simulation is disclosed. The method of operating the simulation begins with the dividing of the reservoir into volume cells, and assigning reservoir parameters such as porosity and permeability of the rock to the particular cells. Temperature and pressure values are also assigned to each of the volume cells, and an equation of state is solved for the cells to determine densities of each of the components of the contents of the reservoirs, examples of such components including methane, ethane, and the like. A black oil simulation of the reservoir is then performed over a time step, to determine the fluxes of the vapor and liquid phases, as reservoir barrel volumes, at each cell boundary. The assigned density values are then used to transform the volumes determined by the black oil simulation to molar quantities for each component. One or more volume cell boundaries correspond to the well output, so that the transformation provides output quantities of the components from the reservoir over the time step; one or more volume cell boundaries may also correspond to injection sites. The method provides an efficient way of providing component mass quantities to downstream simulations, such as surface model simulations.

REFERENCES:
patent: 4273187 (1981-06-01), Satter et al.
patent: 4821164 (1989-04-01), Swanson
patent: 4991095 (1991-02-01), Swanson
patent: 5321612 (1994-06-01), Stewart
Coats, "Reservoir Simulation: State of the Art", Journal of Petroleum Technology, (Society of Petroleum Engineers, 1982), pp. 1633-1642.

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