新疆油田三元复合驱现场使用的碱为碳酸钠,针对该区块的无机矿物组成、原油组成与地层水组成特点,开展了碳酸钠消耗量的研究。结果表明,砾岩油藏地层中的无机黏土矿物对碳酸钠有较强的吸附作用,其中吸附最强的是蒙脱石,其次是绿泥石、伊利石、长石,石英砂吸附性最小。静态吸附的结果证明碳酸钠在松散岩心上的吸附大于胶结岩心上的吸附,随着渗透率的降低,碳酸钠的动态吸附量逐渐减小,杂基对碳酸钠的消耗较大。该区块原油酸值较低,碳酸钠与原油发生化学反应的损失较少,该区块地层水中二价金属阳离子浓度较低,对碳酸钠的消耗也较少。

The sodium carbonate was used as the source of alkali in the Xinjiang Oilfield ASP （alkaline-surfactant-polymer） flooding.Aiming at the charateristic of the components of inorganic mineral,crude oil and underground water in the area,the study on consumption of sodium carbonate was made.The results showed that the inorganic clay minerals in conglomerate reservoir had strong adsorption to sodium carbonate in ASP flooding system,in which the montmorillonite was the strongest adsorbent for polymers followed by chlorite,illite and feldspar,and the adsorbability of quartz sand was lowest.The static adsorption results showed that the adsorption of sodium carbonate on loose cores was greater than that on cemented cores.With the decrease of permeability the dynamic adsorption capacity of sodium carbonate decreased gradually.The miscellaneous groups consumed sodium carbonate much more.The crude oil acid value of the block is lower,and the loss of chemical reaction between the sodium carbonate and the crude oil was less; the divalent cation in the formation water of the block were lower,and the consumption of sodium carbonate was also less.