A Study of Geometry of the Etching Pattern and Fracture Conductivity during Closure stress in Acid Fracturing Process

Acid fracturing treatment, Geomechanical behavior of rock.Acid fracturing is a technique used to enhance oil and gas well productivity in carbonate reservoirs. The procedure involves injecting acid into fractures in the rock surrounding the well, which reacts with the rock surface and creates channels that increase the permeability of the rock. One important factor in acid fracturing design is the conductivity of the fracture, which is influenced by variables such as the pattern of channels on the rock surface, the amount of dissolved rock, the rock's resistance, and the stress required to close the fracture. Conductivity is complex because the way channels close can vary, and its reduction is dependent on the geomechanical behavior of the rock. The pattern of channels created in acid fracturing can be linear or network-like, depending on the rock properties and conditions. Factors such as acid type and concentration, contact time, temperature, acid flow rate, pressure, rock type and properties, and the magnitude of existing compressive and shear stresses in the rock can affect the pattern of channels created in each acid fracturing process. This article aims to explore acid fracturing in carbonate reservoirs and investigate the closure behavior of channels under closure stress . In this study, we have reviewed the modeling of the deformation of irregular fracture surfaces caused by acid etching and fracture conduction caused by the application of closure stress to the fracture.

Keywords:

Well stimulation , Etche pattern , Fracture conductivity ,