用自主研发的酸液体系酸岩反应动力学参数测定装置,测定了4种酸液(常规酸、胶凝酸、转向酸、交联酸)与碳酸盐岩间的反应速率,并研究了同离子效应的影响。结果表明,常规酸、胶凝酸、转向酸、交联酸平均酸岩反应速率分别为6.0909×10^-6、5.4583×10-6、10.6005×10-6、4.8191×10-6mol/(cm2·s),加入CaCl2和MgCl2后的平均酸岩反应速率分别为3.3935×10-6、5.1353×10-6、9.0923×10-6、4.7386×10-6mol/(cm2·S)。与鲜酸酸岩反应相比,加入同离子后,常规酸酸岩反应变得平缓,相同反应时间下的酸浓度增加;在反应8、4、12min后,同离子效应分别对胶凝酸、转向酸、交联酸酸岩反应的影响增大。4种酸液的黏度大小依次为交联酸(250mPa·s)〉胶凝酸(31mPa·s)〉转向酸(18mPa·S)〉常规酸(3mPa·s);加入同离子后,4种酸液反应速率降幅依次为常规酸(44.29%)〉转向酸(14.23%)〉胶凝酸(5.92%)〉交联酸(1.68%)。同离子效应的影响反比于酸液的黏度,黏度越大,同离子效应的影响越小。
The acid-rock reaction rates between four different acids, such as conventional acid, gelled acid, steering acid, crosslinked acid, and carbonate rock were tested using self-developed device which could measure reaction kinetics parameters of different viscosity acids with carbonate. At the same time, common ion effect on acid-rock reaction rate in different acid systems was considered. The results showed that the average acid-rock reaction rate of conventional acid, gelled acid, steering acid and crosslinked acid was 6.0909 × 10-6, 5.4583× 10-6, 10.6005 ×10-6 and 4.8191 × 10-6 mol/(cm2. s), but that changed to 3.3935 × 10-6, 5.1353× 10-6, 9.0923 ×10-6 and 4.7386× 10-6mol/(cm2. s) after adding CaCl2 and MgCl2 into the acids respectively. The reaction rate of conventional acid after adding common ion was slower than that without it, and the spent acid concentration of convention acid with common ion was higher than that of fresh acid. The impact of common ion effect on the reaction rate of gelled acid, steering acid and crosslinked acid increased in 8, 4 and 12 min after reaction respectively when common ion existed. Four acid systems were arranged according to the viscosity in following order: crosslinked acid (250 mPa. s)〉gelled acid (31 mPa. s)〉steering acid (18 mPa.s) 〉 conventional acid (3 mPa. s), and according to the decrease order of reaction rate under the influence of common ion in following order: conventional acid (44.29%) 〉steering acid ( 14.23% ) 〉gelled acid (5.92%) 〉crosslinked acid ( 1.68% ). The effect of common ion was inversely proportional to the viscosity of acid. The higher viscosity, the smaller influence of common ion effect was.