This work was conducted to study the risk of formation damage as the result of mineral scales deposition during smart waterflooding into carbonate core sample, as well as the influence of injected water salinity and ionic composition on mineral scaling and precipitation. The reservoir flowing conditions were simulated by a new laboratory core-flooding procedure, which took into count of the effect of in-situ contact time (CT) of injected water and formation water on scaling. After the optimum CT was determined, extent of permeability decline was studied by the change in the salinity and ionic composition of injection seawater. The scaled core sample was analyzed visually by scanning electron microscopy (SEM) to study the crystal morphology of the scale. Under the experimental conditions, extent of permeability decline caused by CaSO₄ and CaSO₃ composite scales ranged from 61% to 79.1% of the initial permeability. The salinity and the ionic composition of injected smart water, and CT of the mixing waters had significant effects on the co-precipitation of CaSO₄ and CaSO₃ scales. The SEM images reveal that the loss of permeability is mainly caused by the accumulation and growth perpendicular to the pore wall of scale crystals.

进行这项工作是为了研究在智能注水到碳酸盐岩心样品中矿物垢沉积的结果，以及注入的水盐度和离子组成对矿物垢和沉淀的影响。通过新的实验室岩心注水程序模拟了储层的流动条件，该程序考虑了注入水和地层水的原位接触时间（CT）对结垢的影响。确定最佳CT后，通过注入海水的盐度和离子组成的变化研究渗透率下降的程度。通过扫描电子显微镜（SEM）目测鳞片状核心样品，以研究鳞片的晶体形态。在实验条件下，CaSO引起的渗透率下降程度₄和CaSO ₃复合鳞片的初始渗透率为61％至79.1％。注入的智能水的盐度和离子组成，以及混合水的CT对CaSO ₄和CaSO ₃垢的共沉淀有显着影响。SEM图像表明，渗透性的损失主要是由垂直于鳞片晶体的孔壁的积累和生长引起的。