聚合物对石油羧酸盐界面活性的影响

通过测定加入聚合物HPAM前后,不同浓度石油羧酸盐弱碱(Na2CO3)溶液和石油羧酸盐强碱(NaOH)溶液与大庆采油四厂原油间的界面张力,探讨了聚合物的加入对石油羧酸盐界面活性的影响。结果表明:聚合物的加入可显著改善石油羧酸盐弱碱(Na2CO3)溶液的界面活性,未加入聚合物时,石油羧酸盐只能在Na2CO3浓度为8 12 g/L的部分范围达到超低界面张力;加入1500 mg/L HPAM后,界面活性明显改善,尤其是在表面活性剂浓度较高(0.8 3.2 g/L)、Na2CO3浓度低至4 12 g/L区域的界面张力均可达到10-3数量级。聚合物的加入对石油羧酸盐强碱(NaOH)溶液界面活性的改善不如弱碱(Na2CO3)溶液明显。在低NaOH浓度(46 g/L)时,加入HPAM对石油羧酸盐强碱体系的界面活性尚有一定改善,当NaOH浓度为8 g/L时效果已不太明显,而当NaOH浓度分别为10、12 g/L时界面活性反而变差。此外,文中还对聚合物的上述影响从化学的角度进行了初步探讨。

Effects of Polymer on Interfacial Activities of Petroleum Carboxylate

The effect of polymer on the interfacial activities of petroleum carboxylate was discussed by measuring the interfacial tensions between the crude oil of the fourth oil production plant of Daqing oilfield and petroleum carboxylate weak alkali(Na2CO3) / strong alkali(NaOH) solution with different surfactant concentration before and after adding polymer.The results showed that the interfacial tension between petroleum carboxylate∕Na2CO3 system and the crude oilcould reach ultra-low(10-3 mN/m) only when the concentration of Na2CO3 was 8—12 g/L.While the addition of the polymer could improved obviously the interfacial activities of petroleum carboxylate weak alkali(Na2CO3) system,especially in the region of relatively lower concentration of Na2CO3 and the region of relatively higher concentration of petroleum carboxylate.The interfacial tension of the system after adding polymer of 1500 mg/L reached ultra-low when the concentration of Na2CO3 was 4—12 g/L and the concentration of surfactant was relatively higher(0.8—3.2 g/L).The effect of polymer on the interfacial activities of the petroleum carboxylate/NaOH system was weaker than that of petroleum carboxylate/Na2CO3 system.When the concentration of NaOH was 4—6 g/L,the addition of polymer could improve slightly the interfacial activities of carboxylate/NaOH system,while the addition of polymer had opposite effect when the concentration of NaOH was higher(10—12 g/L).The mechanism of the effect of polymer on interfacial activities of petroleum carboxylate/alkaline system was probed from the point of view of chemistry.