Acidizing/stimulation

Study Investigates Effect of Fracture and Vug Networks on Acid-Stimulation Process

This paper extends an integrated two-scale continuum model that contemplates mass, momentum, and energy changes to study the acid-stimulation process in complex carbonate acid-stimulation systems with the development of fracture and vug networks.

Fig. 1—Diagram of the core sample with complex media development. (a) Fracture network, (b) vug network.
Fig. 1—Diagram of the core sample with complex media development. (a) Fracture network, (b) vug network.
Source: SPE 222126.

Acid stimulation in carbonate rocks represents a classic example of reactive flow in subsurface porous media and is an extremely effective improved-oil-recovery technique with broad applications. The acid solution is injected into the formation under the formation fracture pressure to increase formation permeability while bypassing damaged domains around the wellbore. This work extends an integrated two-scale continuum model that contemplates mass, momentum, and energy changes to study the acid-stimulation process in complex carbonate acid-stimulation systems with the development of fracture and vug networks.

Model Developments

The improved two-scale continuum model, consisting of the core-scale model and pore-scale model, is introduced to simulate the acid-stimulation process in dolomite rock. When dealing with the development of fracture and vug networks, the improved two-scale continuum model does not require significant modification.

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