Modeling of Acid-Fracturing Treatments

Summary This paper gives the theory and numerical implementation of a comprehensive acid-fracturing model that solves for fracture geometry (2D or 3D), leakoff, heat transfer, and acid transport simultaneously. The acid-transport model integrates a number of features not accounted for in earlier design models: multiple fluids (acids, gels, and foams); acidizing controlled both by mass transfer and rate of reaction; and leakoff, including the effects of matrix acidizing and wormholing. Examples of treatment design illustrate these features. Coupling with reservoir forecasting models gives the ability to optimize the job or compare it with a proppant treatment.