Study of Acid-Rock Reaction Kinetics Under High Temperature and Pressure Conditions Based on the Rotating Disk Instrument

In this paper, a rotating disk instrument was used to simulate the acid-rock reaction under high temperature and pressure reservoir conditions. By changing the reaction temperature, pressure, rotational speed and acid concentration, the reaction rate was measured first, and then the reaction parameters such as reaction rate constant, reaction order and effective mass transfer coefficient of H+ were analyzed through data processing and regression analysis; reaction kinetics equation was therefore obtained, and the effect of various factors on the acid-rock reaction rate were also analyzed. Test results indicated the following: Acid-rock reaction rate increased first and then decreased with acid concentration; minimum value of H+ effective mass transfer coefficient was found with the variation of rotational Reynolds number; the effect of pressure can be neglected when the pressure is above 6 MPa; reaction rate increases with the increase of reaction temperature, which shortened the effective time for acid reaction, but the conductivity can be enhanced by non-uniform etching.