Study on the migration of ASP flooding system in long core [ASP三元复合驱油体系在长岩心中的运移规律]

作者：Bi Y.-C.; Sun L.-H.; Xiao H.-M.; Gu Z.-B.; Zhao H.-Y.; Yue Q.

来源：日用化学工业, 2019, 49(12): 790-794.

DOI：10.3969/j.issn.1001-1803.2019.12.004

• ASP flooding
• chemical agent concentration
• long core model
• surfactant
• transport law

To study the migration of ASP （alkali/surfactant/polymer） flooding system in the formation in Daqing Oilfield, a sand filling tube model with a permeability of 479 mD and a length of 6 m was prepared, according to the practical formula applied in oilfield, isothermal displacement was carried out at 45 ℃. The concentration, viscosity and interfacial tension of the produced fluid were analyzed. The results showed that in the ternary flooding stage, the higher the injection degree was, the lower the water content and the higher the recovery factor would be; the flooding effect of the system completely failed after ASP started 1.5 PV. The loss degrees of chemical agent concentration and viscosity in the system were as follows: viscosity （6 times）> surfactant （4 times）> polymer 3 times）> alkali （2 times）. Because of the excessive loss of viscosity, the system lost the function of controlling the fluidity ratio in the latter 1/12 well spacing. Because of the presence of alkali, ultralow interfacial tension 0.001 mN/m）could be maintained for the first 1/2 well spacing, while low interfacial tension （0.01 mN/m could be maintained for the rear 1/2 well spacing.

• 单位
  中国科学院大学