A New Prediction Model of Solid Particle Acidification Process and Its Application
As a retarding acid solution system,solid particle acid has the ability to deeply enter carbonate reservoirs during acidifi-cation.It is of great significance for optimization and evaluation of acid types to clarify the acidification mechanism of solid particle acid in carbonate reservoirs.Thus,a new mathematical model for description of the solid particle acidification process of carbonate rocks was proposed to characterize the slow release performance of particle acid and further study the effects of injection rate and particle acid concentration on the acidification process of carbonate reservoirs.The results indicate that the carbonate reservoir is corroded less due to lower particle acid concentration around the inlet,and high acid concentration distributes far from the inlet.With increasing particle acid concentration,the type of corrosion changes from uniform corrosion to directional conical wormholes,and the length and width of the wormholes increase and decrease,respectively.With increasing injection rate,the type of corrosion changes from wormhole to uni-form corrosion,and the breakthrough time of the reservoirs increases constantly.
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