Foam Diversion Acidification Of Mathematical Modeling And Foam System Pilot Study

In well stimulation, proper placement of treatment fluids is an important issue, especially in multi-layer acidizing. Foam can help divert acid to reservoir layers most in need of stimulation. Foam may be injected along with acid or in alternating slugs with acid. This paper focuses on the theoretical and experimental research of foam diversion processes in matrix acidizing. The main work in this paper includes: The foreign and domestic literatures concerning the acidizing and diverting technique, especially for diverting technique, from foam experimental evaluation to field application, from foam rheology to foam flow in porous medium have been researched on, and its development and tendency in the field of stimulation have been known; Optimal foam formula has been selected by quadrature experimental design method, and sensitive evaluation of the formula has been carried out; The function of gas relative permeability in the present of foam account for the effect and the change of trapped-gas is established; On the basic of limiting capillary pressure mechanism, applying fractional-flow theory, foam diversion model has been finally established. And two important issues in diversion-process design have been discussed, which is guideline for actual application; . Foam hydrodynamic model and temperature model in well bore during foam-acid diversion have been established and simultaneously calculated; Temperature model in formation has been calculated; "Two acid, three mineral" model has been calculated; Foam diversion process and matrix acidizing design model have been programmed and solved by VB computer language for windows, by which actual example are calculated.