Patent ID: 7099811
Filing Date: 2006-08-29
Classification: E21B

Abstract:
1. A method of simulating optimum conditions to be applied in a well drilled through an underground reservoir with any trajectory so as to progressively eliminate, by means of fluids from the reservoir, deposits or cakes formed in at least a peripheral zone of the well as a result of drilling and completion operations, comprising: acquiring initial data obtained by laboratory measurements of a thickness of the cakes and of damaged permeability and restored permeability values of the peripheral zone, as a function of distance to the wall of the well; according to an initial permeability value of the formation surrounding the well; discretizing a damaged zone by means of a 3D cylindrical grid pattern forming blocks of a radial thickness in relation to a diameter of the well; and solving in the grid pattern a diffusivity equation modelling flow of fluids through the cakes by accounting for measured initial data and by modelling evolution of permeability as a function of flow rates of fluids flowing through the cakes, so as to deduce therefrom optimum conditions to be applied for producing from the well.