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Measurement of Acid Reaction Ratesof a Deep Dolomitic Gas Reservoir

机译：深部硅质气藏酸反应速率的测量

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A rotating disk instrument was used to measure aciddissolution rates, reaction rates, reaction order andactivation energy of reservoir rock from a deep dolomiticgas reservoir in Saudi Arabia. These values are requiredfor acid fracturing simulations. Results of more than 50experiments are reported in this paper. Measurementsare made from room temperature to 85 oC at rotationalspeeds of 100 to 1000 rpm and acid concentrations of0.05 to 5N HCl (0.2 to 17 wt%). The results show howacid dissolution rates change as the reservoir rock variedfrom 3 to 100 wt% dolomite. Factors affecting themeasured parameters are discussed in detail. It wasfound that the reactivity of the rock varied from valuesexpected for pure calcite marble to those expected forpure dolomite marble. At grain densities near 2.72 g/cm3(expected for pure calcite), rock dissolution rates variedby more than an order of magnitude due to rockmineralogy. At grain densities near 2.83 g/cm3 (expectedfor pure dolomite) rock dissolution rates were higher than that observed with pure dolomitic marble. Reactionrates depended on mineralogy and the presence of tracecomponents such as clays.
机译：旋转盘仪器用于测量沙特阿拉伯深部白云岩气藏的酸溶解速率，反应速率，反应顺序和活化能。这些值是酸压裂模拟所必需的。报告了50多个实验的结果。在室温至85 oC下以100至1000 rpm的转速和0.05至5N HCl（0.2至17 wt％）的酸浓度进行测量。结果表明，随着储集岩从3 wt％到100 wt％的白云石变化，酸的溶解速率如何变化。详细讨论了影响测量参数的因素。已经发现，岩石的反应性从纯方解石大理石的预期值到纯正白云石大理石的预期值不等。在晶粒密度接近2.72 g / cm3（纯方解石预期）的情况下，由于岩石矿物学的原因，岩石溶解速率的变化幅度大于一个数量级。在接近2.83 g / cm3的颗粒密度（纯白云岩预期）下，岩石溶解速率高于纯白云石大理石。反应速率取决于矿物学和痕量组分（如粘土）的存在。

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