Patent ID: 7853440

Claim:
A method for optimizing acid injection parameters by modelling acidification within a porous medium as a result of acid injection, wherein said medium is represented by a computer-implemented dual-medium model, the method comprising: a) constructing said dual-medium model in a computer by considering a first sub-medium favourable to dissolution breakthroughs, and a second sub-medium that is not favourable to dissolution breakthroughs, by carrying out, for each one of said sub-media, a description of acid transport, mass conservation of said sub-medium and mass conservation of said acid, the description being specified in meters, and by describing an acid transfer from one sub-medium to the other sub-medium, by means of equations obtained by carrying out a volume averaging, specified in meters, of equations describing a propagation of an acid in a single-medium model specified in centimeters, said equations comprising a dissolution term depending on a norm of a local acid velocity and on a mean porosity specified in meters; b) initializing said dual-medium model from one or more experimental calibrations; c) modelling said acidification, by means of execution of said dual-medium model, by determining physical parameters representative of said porous medium and physical parameters relative to the acid injected; d) optimizing acid injection parameters by using said physical parameters.