Static experiments and dynamic displacement experiments were conducted to quantitatively determine the amount of precipitate generated by the CO₂-formation water reaction at different temperatures, pressures, and scaling ion concentrations during CO₂ flooding in the Chang 8 block of Changqing Oilfield, the influence of precipitate on the physical properties of reservoirs was investigated, and the corresponding mathematical characterization model was established. The mathematical characterization equation was used to correct the numerical simulation model of E300 module in Eclipse software. The distribution pattern of inorganic salt precipitates during continuous CO₂ flooding in Chang 8 block was simulated, and the influence of inorganic salt precipitates on oil recovery was predicted. The inorganic salt precipitate generated during CO₂-formation water reaction was mainly CaCO₃, and the pressure difference and scaling ion concentration were proportional to the amount of precipitate generated, while the temperature was inversely proportional to the amount of precipitate. The rate of core porosity change before and after CO₂ flooding was positively correlated with temperature and flooding pressure difference. The core porosity increase in the CO₂-formation water-core reaction experiment was always lower than that of CO₂-distilled water-core reaction experiment because of precipitation. The area around the production wells had the most precipitates generated with the injection of CO₂. The oil field became poor in development because of the widely distributed precipitate and the recovery decreased to 33.45% from 37.64% after 20-year-CO₂ flooding when considering of precipitation.

进行了静态实验和动态位移实验，定量确定了长庆油田长8区块CO ₂驱油过程中，在不同温度，压力和结垢离子浓度下，CO ₂形成水反应产生的沉淀量，研究了沉积物对储层物性的影响，建立了相应的数学表征模型。数学特征方程式用于在Eclipse软件中校正E300模块的数值模拟模型。连续CO ₂期间无机盐沉淀物的分布规律模拟了长8区块的洪水，并预测了无机盐沉淀物对采油量的影响。在CO ₂形成水反应过程中产生的无机盐沉淀物主要为CaCO ₃，压力差和结垢离子浓度与沉淀物的含量成正比，而温度与沉淀物的量成反比。CO ₂驱前后岩心孔隙率变化率与温度和驱压差呈正相关。在CO ₂形成水核反应实验中，岩心孔隙率的增加总是低于CO _2的。沉淀法进行蒸馏水核反应实验。注入CO ₂产生的沉淀最多的是生产井周围的区域。由于降水分布广泛，该油田的开发变得很差，考虑到降水，采收20年的CO ₂驱油后，采收率从37.64％降至33.45％。