An Experimental Study on Alkaline/Surfactant/Polymer Flooding Systems Using Natural Mixed Carboxylate

Orthogonal-test-design method has been used to determine the optimal formula by phase behavior and interfacial tension studies, respectively. The effect of each component of two alkaline/surfactant/polymer flooding systems on interfacial tension is discussed, in which a low-price natural mixed carboxylate (SDC) is used as the major surfactant. The results indicate that the optimal composition is SDC (0.5%), alkaline NaHCO3/Na2CO3 with mass ratio of 1 (1.0%), and hydrolyzed polyacrylamide(0.1%). In the coreflood experiment, their oil recovery is increased by about 25.2% and 26.8% original oil in place, respectively.

适用于大庆油田的天然混合羧酸盐ASP驱油体系

针对酸值为０．１ ｍｇ ＫＯＨ／ｇ 的大庆原油，通过相态研究和界面张力测定进行配方初选，通过稳定性测定进行配方调整，得到了以天然混合羧酸盐ＳＤＣ为表面活性剂的ＡＳＰ三元复合驱油体系：１ ．２％ 复碱（ 质量比１∶１ 的Ｎａ２ＣＯ３ ＋ ＮａＨＣＯ３）＋ ０．６％ ＳＤＣ５＋ ０ ．５％ 植物胶（ 苎麻胶） ＋ ０ ．１６％ ＨＰＡＭ（ ＢＰ７） 。此体系与大庆原油间的最低瞬时界面张力为５ ．９３ ×１０－ ４ ｍＮ／ｍ 。在室内用两种填砂管模型进行驱油实验，得到的采收率为１８ ．８ ％ 和１９．１ ％ （ ＯＯＩＰ），注入１ ｇ ＳＣＤ５ 驱出原油１３８．３ ｍＬ。

天然混合羧酸（盐）复合驱油体系的研究

研究了天然混合羧酸（盐）复合驱油溶液与大庆、胜利原油构成的体系的界面性质，考察了Ｎａ２Ｃｏ３、ＮａＨＣＯ３、ＮａＣｌ、ＨＰＡＭ、助表面活性剂对体系界面性质的影响，提出了复合驱油体系的配方。研究结果表明，天然混合羧酸（盐）可使复合驱油溶液与大庆或胜利原油之间的界面张力降至超低值。