Abstract
AbstractIn the process of stimulation by acid fracturing in tight carbonate rocks, the effective acid erosion seam length is reduced and the stimulation rate is reduced. To date, there have been few studies on the characterization of the acid leakoff mechanism in the process of acid fracturing in tight carbonate rocks. In this study. the wormhole generated by acid rock reaction and the kinetic experiment of acid rock reaction were used as characterization methods to determine the main control parameters of the filtration rate during the process of acid fracturing in tight carbonate rocks: the acid rock reaction rate constant and reaction order. The higher the constant value of the reaction rate, the longer the acid invasion area, the more likely to produce wormhole, and the better the stimulation effect. The larger the reaction order is, the more intense the reaction between core mineral composition and acid solution will be. However, excessive CO2 will be generated during the intense reaction, which prevents non-uniform dissolution and prevents the formation of fracture channels with high conductivity. The key to the success of stimulation is to select suitable acid type for different reservoirs in different regions.KeywordsTight carbonate rockAcid fracturingLeakoffAcid rock reaction kineticsWormhole
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