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通过岩心模拟实验的方法研究文23气田储层结盐机理。应用天然岩心与人造岩心模拟不同驱替压力条件下的结盐过程,考察驱替压力与渗透率变化关系,从而确定结盐上限压力与观察结盐趋势。文23气田随着开发程度的提高储层将出现结盐现象,结盐与储层压力降低有着直接关系,当压力降低至20MPa以下时,开始出现结盐现象,当压力降到4MPa以下后,储层内结盐加剧。另外还研究了结盐后对渗透率的伤害程度,分析了孔隙喉道、孔隙度、比表面积等因素对结盐的影响。渗透率越低、孔隙度越低、比表面积越大结盐后对岩心的伤害程度越大,伤害程度可达90%以上。
Study on the mechanism of salt formation in Wen23 gas field by core simulation. Natural cores and artificial cores were used to simulate salt formation under different displacement pressures. The relationship between displacement pressure and permeability was investigated to determine the upper bound pressure of salt and the trend of salt formation. With the development of Wen 23 gas field, salt formation will occur in the reservoir. The salt formation is directly related to the pressure drop in the reservoir. When the pressure drops below 20 MPa, salt formation begins to occur. When the pressure drops below 4 MPa, Salt in the reservoir intensifies. In addition, the degree of damage to the permeability after salt formation was also studied, and the effects of pore throats, porosity, specific surface area on salt formation were analyzed. The lower the permeability, the lower the porosity, the larger the specific surface area, and the harder the core will be, the more the harm will reach 90%.