盐对热采添加剂在石英砂表面吸附的影响

The Effect of Inorganic Salt on the Adsorption of Steam Injection Additives on the Surface of Quartz

热采添加剂是一种非离子型的高分子表面活性剂，它的胶束溶液常用于稠油油藏的蒸汽吞吐或蒸汽驱中．为了研究热采添加剂在多孔介质中吸附损失的机理，并为降低吸附量提供依据，应用固液吸附法对胶束溶液中热采添加剂在石英砂表面的吸附及盐对吸附的影响进行了研究．结果表明：６０℃时热采添加剂在石英砂表面达到吸附平衡需要２０ｈ，平衡吸附量为１．８ｍｇ／ｇ砂，吸附等温线不服从Ｌａｎｇｍｕｉｒ吸附等温线；ＮａＣｌ、ＮａＢｒ能增大吸附量；Ｎａｌ浓度高于６００ｍｇ／Ｌ时也增大吸附量；阳离子电荷增高，离子半径减小。

Abstract Steam injection additives are often used in steam stimulation or steam flooding of heavy crude oil reservoir. In order to study the loss mechanism and provide the basis of lowering the adsorptive capacity of steam injection additives in porous medium,this paper studied the effect of the adsorption and salt of steam injection additives on the surface of quartz sand on the adsorption. The result was that it took 20 hours for the adsorption of steam injection additives on the surface of quartz sand to reach the balance of adsorption,the adsorption isothermal curve doesn't follow lamgmuir isothermal and the adsorptive capacity was 1. 8mg/g quartz sand at 60℃. NaCl and NaBr increased the adsorptive capacity. So did Nal when the concentration was higher than 600 mg/L. The adsorptive capacity increased with the increase of the cationic charge and the reduction of the ion radius.