The temporal permeability and damage evolutions of low-permeability sandstone cores during triaxial and long-term dissolution experiments were measured using a triaxial-flow system. Three triaxial experiments were performed on sandstone cores having initial permeability ranging from to . Two sets of long-term dissolution experiments were conducted on cracked sandstone cores. All dissolution experiments were performed at room temperature and using a 10 g/L H₂SO₄ and 0.2 g/L H₂O₂ input solution. Permeability evolution was determined using Darcy’s law. The cores experienced an average increase of 25% in permeability in the dissolution experiment and 900%~1500% increase at the end of the experiment. The dissolution was fairly homogeneous during the long-term experiments whether on the 1 mm scale or the 10 μm scale. The relationship between damage and permeability was speculated and its correlation coefficient has been proved to be close to 1. These results suggest that hydraulic fracturing works well in permeability increase in low-permeability sandstone reservoir.

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三轴和长期溶解实验中砂岩渗透率演化的实验研究

使用三轴流系统测量了低渗透率砂岩岩心在三轴和长期溶解实验过程中的时间渗透性和破坏演化。在初始渗透率范围为 到 。在破裂的砂岩岩心上进行了两组长期溶解实验。所有溶解实验均在室温下并使用10 g / LH ₂ SO ₄和0.2 g / LH ₂ O ₂输入溶液进行。使用达西定律确定渗透性演变。在溶出度试验中，岩心的渗透率平均提高了25％，在试验结束时，岩心的渗透率提高了900％〜1500％。在长期实验中，无论是在1 mm刻度还是在10μL刻度上，溶出度都相当均匀 米规模。推测了损伤与渗透率之间的关系，并证明了其相关系数接近于1。这些结果表明，水力压裂在低渗透砂岩油藏的渗透率增加中效果很好。