Development of the semi empirical approach on wormhole formation in carbonates

Authors:
Ganopolskij R.M. Fedorov K.M. Gilmutdinov B.R. Folomeev A.E.
Abstract:

Carbonate acidizing is a technology of well productivity stimulation in oil recovery practice. The maximum effect of such a well treatment is connected with acidizing channels formation of several millimeters in diameter (wormholes). One of the approaches to predict the acidizing effect of wormholing is the semi empirical simulation based on the results of the experiments of core plug channeling by acid injection. It was established that maximum of permeability improvement corresponds to the minimum of injected volume and is defined by wormhole breakthrough. Presentation of such equation in the dimensionless form involves dimensionless criteria such as Damköhler, Peclet, etc, that are defined by the results of the calculation and with experiment data matching. The new approach to derivate of the main equation defining the acid wormholing process is developed in the present paper.