Inflow performance relationship for horizontal wells producing oil from multi-layered heterogeneous solution gas-drive reservoirs

摘要

A method for assessing an inflow performance relationship for a horizontal well in heterogeneous solution gas drives reservoirs. A commercial simulator Eclipse is utilized to develop IPRs for horizontal wells producing oil from solution gas drive reservoirs. Firstly, a simulation model is developed where a base case is considered with typical rock, fluid and reservoir properties using a black oil model. Dimensionless IPR curves are generated by obtaining a set of points relating to flowing bottom-hole pressures to oil production rates. The effects of several reservoir and fluid properties such as bubblepoint pressure, oil gravity, residual oil saturation, critical gas saturation, initial water saturation, porosity and absolute permeabilities on the calculated curves are investigated. A new single empirical IPR model is obtained for horizontal wells producing oil from heterogeneous solution gas drive reservoirs suitable for systems with different reservoir permeability.

主权项

1. A method for assessing an inflow performance relationship (IPR) for a horizontal well in heterogeneous solution gas drive reservoirs, comprising:
inputting permeability values of a heterogeneous reservoir; determining spatial variability of the heterogeneous reservoir based on the permeability values, wherein determining the spatial variability of the heterogeneous reservoir includes
inputting a value for a number of pairs of permeability values at a predetermined distance apart,determining a summation including logarithms of the permeability values, anddividing the summation by a value equal to twice the number of pairs of permeability values; measuring a bottom hole pressure of the horizontal well; and determining a production rate of the horizontal well based on a bottom hole pressure and the determined spatial variability.