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二氧化碳注入油藏后,与储层岩石和流体发生化学反应,将改变孔隙度、渗透率、润湿性、流体的酸碱度,进而影响采收率。用CO2岩心驱替实验装置模拟了二氧化碳与岩石和流体的相互作用并对实验结果进行了分析。结果表明,矿物溶解使孔隙度变大,沉淀堵塞孔隙,两者皆改变渗透率,岩石由亲油转为亲水,流体pH值下降。
After carbon dioxide is injected into a reservoir, chemical reactions with reservoir rocks and fluids will change the porosity, permeability, wettability, fluid pH, and thus the recovery. The interaction between carbon dioxide and rock and fluid was simulated by CO2 core-flooding experiment and the experimental results were analyzed. The results show that the dissolution of minerals increases the porosity and precipitates plug the pores, both of which change the permeability, and the rock turns from lipophilic to hydrophilic and the pH of the fluid decreases.