ASYMPTOTIC REPRESENTATION OF THE TEMPERATURE FIELD IN INJECTION STAGES DURING THE CYCLIC ACIDIZING OF THE FORMATION

The authors have obtained an asymptotic solution to the problem on the temperature fi eld appearing during the injection of a chemically active solvent into a layered inhomogeneous orthotropic formation with account taken of temperature disturbances due to the preceding technological processes. This makes it possible to use the obtained solution for calculations under the conditions of multiple cyclic action. The sources of temperature disturbances are the liberation of heat due to the chemical reaction and the change in the temperature of the acid solution
injected into the formation. Therefore, the obtained solution also covers the range of thermal-acidizing processes. The implemented method of construction of the solution is an extension of an asymptotic method accurate in the mean, which has been proposed by the authors as applied to the problems with nonzero initial conditions. The results of calculations of space–time temperature distributions under the conditions of hydrochloric acid treatment of carbonaceous formations have been given.
The authors have obtained an asymptotic solution to the problem on the temperature fi eld appearing during the injection of a chemically active solvent into a layered inhomogeneous orthotropic formation with account taken of temperature disturbances due to the preceding technological processes. This makes it possible to use the obtained solution for calculations under the conditions of multiple cyclic action. The sources of temperature disturbances are the liberation of heat due to the chemical reaction and the change in the temperature of the acid solution
injected into the formation. Therefore, the obtained solution also covers the range of thermal-acidizing processes. The implemented method of construction of the solution is an extension of an asymptotic method accurate in the mean, which has been proposed by the authors as applied to the problems with nonzero initial conditions. The results of calculations of space–time temperature distributions under the conditions of hydrochloric acid treatment of carbonaceous formations have been given.
Author:  A. I. Filippov, O. V. Akhmetova, A. A. Koval′skii and I. F. Kabirov
Keywords:  temperature fi eld, injection of acid, carbonate formation, asymptotic method
Page:  1426