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在历史上 ,乳化酸最初用在压裂酸化中 ,通过综合理论研究、实验研究和矿场实验 ,最近更清楚地认识了乳化酸在基质酸化方面的应用。本文讨论乳化酸作为一种激化流体 ,在非均质碳酸盐岩地层基质处理中的应用。乳化酸有延缓扩散作用 ,在低渗透率或被伤害的地层中 ,在低速下注入 ,它会成为一种有效的形成酸蚀孔洞的流体。同样在低速下注入 ,普通盐酸基本上都消耗在地层表面 ,而无力深度穿透到地层内部产生酸蚀孔洞。本文给出流动实验结果 ,以比较乳化酸和普通盐酸的效率。试验了不同的乳化酸体系 ,分析了注入速度、粘度和酸 /油体积比时岩心样品的影响。使用Fann 50仪器 ,实验分析了乳化酸体系的流变性质和温度稳定性 (直到2 50 )。油包酸乳化液在厚层段中是有效的激化流体 ,在这些层段中 ,高渗透夹层可能起漏失层的作用。通过井内流体流动和分布实例的计算 ,这已得到证实。
Historically, emulsified acids were originally used in fracturing and acidizing and recently more clearly recognized the use of emulsified acids in matrix acidification through comprehensive theoretical research, experimental studies, and field experiments. This article discusses the use of emulsified acid as an activation fluid in the matrix treatment of heterogeneous carbonate rock formations. Emulsified acids have a retarding effect of diffusion and are injected at low velocities in low-permeability or damaged formations, which act as an effective fluid for the formation of etched pores. Also injected at low speed, ordinary hydrochloric acid is basically consumed in the formation surface, and inability to penetrate deep into the formation of acid etching holes. This article presents the results of flow experiments to compare the efficiency of emulsified and normal hydrochloric acid. Different emulsified acid systems were tested and the influence of core samples on injection speed, viscosity and acid / oil volume ratio was analyzed. Using the Fann 50 instrument, the rheological properties and temperature stability of the emulsified acid system were experimentally analyzed (up to 250). Oil-in-oil emulsions are effective activation fluids in thick intervals in which high-permeability interlayers can act as a lost circulation. This has been confirmed by the calculation of fluid flow and distribution examples in the well.