Study On Kinetics Of Acid Rock Reaction Controlled By Acid Viscosity

Acidification is a common measure for carbonate reservoir reconstruction.The tackifying method is usually used to reduce the reaction speed and achieve deep penetration.Unlike conventional acidification,the tackified acid shows a low reaction rate,which directly affects the acidification design and acidification effect.For this reason,conventional acid,thickening acid and strengthening acid were selected as the research objects,considering the difference of acid tackifying mechanism.The difference of static and dynamic acid rock reaction kinetics between different acid liquids and Xinjiang limestone outcrop is analyzed.The kinetics equation of acid rock reaction and the kinetics parameters of acid rock reaction were obtained.The relationship between H~+concentration,temperature,rotating speed,viscosity and reaction rate was analyzed.The relationship between static and dynamic acid rock reaction rate functions under temperature and H~+concentration control was established by using multivariate nonlinear regression method.The relationship between core etch morphology and flow field was analyzed by Fluent simulation method.The analysis shows that the reaction rate of acid and rock is positively correlated with flow rate,temperature and H~+concentration.But negatively correlated with acid viscosity.As the viscosity increases,the influence of other influencing factors on the reaction rate decreases.The acid rock reaction rate is the result of the reaction series and the reaction rate constant.The former is the description of the influence of H~+concentration on the acid rock reaction rate.Under the influence of the reaction number on the reaction rate,it has a comparative advantage.In the system of steeringacid acid,the inhibiting effect of tackifying on mass transfer is greater than that of heating on mass transfer.