Patent ID: 7896072
Filing Date: 2011-03-01
Classification: E21B

Abstract:
1. A method for designing and performing a treatment operation on a subterranean formation penetrated by a wellbore, wherein the treatment operation includes the use of a treatment fluid comprising reactants for a chemical reaction, the method comprising the steps of: (a) obtaining wellbore temperature-profile information; (b) obtaining kinetic information of the extent of the chemical reaction over time under at least one test temperature profile for a test fluid comprising the reactants for the chemical reaction; (c) analyzing at least the wellbore temperature-profile information and the kinetic information: (d) introducing the treatment fluid through the wellbore into the subterranean formation according to the treatment set of introducing conditions; (e) measuring the treatment temperature-profile for the treatment fluid when it is introduced through the wellbore into the subterranean formation under the treatment set of introducing conditions; (f) obtaining heat-of-reaction information for the chemical reaction; (g) analyzing at least the wellbore temperature-profile information, the treatment temperature-profile information, and the heat of reaction to help estimate the extent of the chemical reaction as the fluid enters the subterranean formation and to help design a minimum residence time for the treatment fluid in the subterranean formation at the temperature of the subterranean formation to allow for at least a desired percent completion of the chemical reaction; and (h) shutting-in the well to provide at least the designed minimum residence time.