Patent ID: 7774183
Filing Date: 2010-08-10
Classification: E21B

Abstract:
1. A method of modeling the pressure in a wellbore during acid treatment with a self diverting acid delivered at a flowrate Q, the pressure being determined at a depth z, a distance r from the center of the well, and a time t, the method involving use of functions derived from core flooding experiments wherein a self diverting acid is injected into a core and the pressure along the core is measured as a function of time, the modeling method comprising: calculating at least one of an effective viscosity μ wherein: k μ μ is the viscosity of the acid; Δp ⊖ Δp ⊖ using a simulator to calculate pressures within the formation on the basis of the effective viscosity μ r , the mobility M r , and/or the permeability k r .