Add time:08/23/2019         Source:sciencedirect.com

Due to the complex mineral composition and structure of sandstone rock as well as the diversity and randomness of acid-rock heterogeneous reactions, the acid-rock reaction mechanisms of sandstone acidizing are not well understood. A model that can be used to describe the kinetic reactions that occur during sandstone acidizing is needed. Based on theoretical analysis and laboratory experiments, this paper reveals the main reaction forms of hydrofluoric acid and sandstone mineral in sandstone acidizing, demonstrates that hydrochloric acid catalytic action occurs during HCl/HF mixture acid dissolving sandstone mineral, and analyzes the pattern of hydrochloric acid catalytic action. In addition, an acid-rock reaction rate mechanism model was developed using Freundlich adsorption theory. The model takes into account the combined effects of two parallel reaction processes in the reaction of mud acid dissolving sandstone mineral: (1) hydrofluoric acid directly reacting with the minerals' lattice bond and (2) hydrochloric acid adsorbed on mineral lattice surfaces and then serving as a catalyst in the reaction between hydrofluoric acid and sandstone minerals. Furthermore, kinetic experiments of HCl/HF mixture acid fluid reacting with an actual reservoir sandstone core under various formation temperatures, pressure levels, and acid shear flow conditions were carried out using a rotating disk instrument. The mapping method was used to determine the kinetic reaction parameters, and the developed acid-rock reaction rate mechanism model was used to identify the acid-rock kinetic reaction equations of sandstone formation.

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