【作者】 高慧梅；

【导师】 康万利；

【作者基本信息】 大庆石油学院 ， 油气田开发工程， 2004， 硕士

【摘要】 针对表面活性剂／聚合物二元体系对活性剂的要求，筛选了数十种活性刑，得到了非离子表面活性剂SNS-1和改性植物羧酸盐SNHD，并对SNS-1和SNHD体系进行了系统的研究。探讨了活性剂浓度、聚合物浓度、矿化度、温度等因素对体系界面张力的影响，两种活性剂在大庆油砂上的吸附情况以及二元体系的驱油效果。 结果表明：①SNHD具有很好界面活性，在0.05％～0.3％浓度范围内均可达到10~3mN／m数量级的超低界面张力。其二元体系只有很好的抗盐性，聚合物对其二元体系影响不大。②SNS二元体系界面张力达到10~2mN／m数量级，聚合物浓度影响SNS的平衡值，但在浓度小于1000mg／L时，影响较小。在45℃～50℃范围内，随着温度的升高，SNS体系界面张力降低。③改性植物羧酸盐SNHD吸附量随着活性剂浓度的增加出现一最大值，然后下降。④测得SNS的吸附量为1.1mg／g砂。⑤SNS二元体系使岩石润湿性亲水性增强，且表面活性剂和聚合物浓度增加，润湿程度增加。⑥在化学剂成本一致的情况下，SNS-1二元体系与二元体系提高采收率幅度与二元体系相近，在聚合物浓度为1500mg／L时，化学驱采收率略高于三元复合驱。⑦SNHD二元体系与三元体系化学剂成本相当时，化学驱采收率接近。在聚合物浓度和段塞大小相同时，二元驱采收率明显高于聚合物驱。⑧给山了二元驱油主要机理：除了表面活性剂降低界面张力提高洗油效率机理和聚合物扩大波及系数机理外，还有聚合物弹性提高洗油效率机理。 此外，探讨了二元体系动态界面张力的影响因素：碱浓度、矿化度、表面活性剂浓度、聚合物浓度。提出了聚合物浓度是影响动态界面张力的主要因素之一，认为在达到最低界面张力前，动态界面张力由扩散控制。更多还原

【Abstract】 In this paper several dozen kinds of surfactants were screened for the polymer/surfactant (PS) system. The non-ionic surfactant SNS-1 and modified plant carbonxylate SNHD are chosen and researched in detail. The effects of surfactant concentration, polymer concentration,salinity,temperature on interfacial tension were studied. Adsorption of surfactants on the Daqing oil sand and oil displacement efficiency of two PS systems are also studied.The results show : (1)The surfactant SNHD has a very good interfacial activity. The interfacial tension could be reduced to ultra-low (10-3 mN/m) when the concentrations are varied from 0.05% to 0.3%.The surfactant has good salt tolerance. The polymer has no effect on it. (2)The interface tension of SNS-1 system can reach 10~2mN/m. The concentration of polymer influences the time to reach the balance value. But the effect is not obvious when the concentration of polymer is smaller than 1000 mg/L. When the temperature is varied from 45@ to 50@, the interfacial tension reduces with the increasing of temperature. (3)The adsorption of carboxylate on oil sand increases to maximum and then decreases with the increasing of surfactant concentration.(4)The adsorption value of SNS-1 is 1.0 mg/g oil sand. (5)After PS flooding the rock water wettability is strengthen. The degree of wettability increases with the increasing of polymer or surfactant concentration.(6)The recovery of SNS-1 system is near to ASP system when the cost of chemistry is equal. When the concentration of polymer is 1500 mg/L, the recovery of PS flooding is higher than ASP flooding. (7)The recovery is nearly the same when the PS and ASP systems have the same cost of chemistry (8)The mechanism of PS flooding is summarized out. Besides reducing interfacial tension to increase the displacemnt efficiency and polymer increase the sweep efficiency coefficient, the elasticity of polymer also can increase the displacement efficiency.Furthermore, the influence factors of dynamic interface tension are discussed. They are salinity, surfactant concentration, aqueous viscosity and so one. The polymer is the main factor among them. Dynamic interfacial tension is controlled by surfactant diffusion before reaching minimum interface tension.更多还原