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利用国产露头砂岩岩心,研究了亲水条件下,无机盐对岩心采用表面活性剂溶液进行自发渗吸驱油的规律和采收率的影响。研究表明,无机盐对亲水砂岩的化学渗吸行为和最终渗吸采收率存在一定影响,具体表现为表面活性剂溶液中添加Ca2+或SO42-后,随着2价离子浓度增加,采收率先小幅下降后快速增加,采收率与2价离子浓度呈类似“∪”型变化特征,较高浓度的2价离子对化学渗吸具有一定促进作用。添加适量的Ca2+或SO42-,可以促进岩心的化学渗吸,从而提高岩心渗吸采收率。
Using domestic outcrop sandstone cores, the effects of inorganic salts on the law of spontaneous imbibition and oil displacement and the oil recovery by using surfactant solution in the core were studied under hydrophilic condition. The results show that inorganic salts have certain influence on the chemical imbibition behavior and ultimate oil recovery of the hydrophilic sandstone. The specific performance is that when Ca2 + or SO42- is added to the surfactant solution, with the increase of the divalent ion concentration, After the first drop slightly increased rapidly, the recovery rate and the 2-valent ion concentration showed a similar “∪” type changes, higher concentrations of divalent ions on the chemical imbibition has a certain role. Adding appropriate amount of Ca2 + or SO42- can promote the chemical imbibition of the core, so as to improve the core seepage recovery rate.