碱/表面活性剂/聚合物相互作用对河间油藏油水界面张力特征的影响

Influence of alkaline/surfactant/polymer interaction on characteristics of interfacial tension in Hejian reservoir

在任丘油田河间油藏油层及流体性质（90℃温度、矿化度为5 192.2 mg/L的采出水和5 682.6 mg/L的注入水、河间原油）的条件下,研究了表面活性剂、碱和聚合物相互作用对油水界面张力的影响。结果表明,单一石油磺酸盐CDS-1在有效浓度为0.01%-0.3%范围内,瞬时动态界面张力和平衡界面张力降低到10^-2mN/m数量级。向浓度为0.05%的CDS-1溶液中加入Na2CO3,瞬时动态界面张力和平衡界面张力变化不大,仍在10^-2mN/m数量级;与Na2CO3高浓度相比,当Na2CO3浓度为0.5%时,平衡界面张力和瞬时界面张力降低明显,瞬时动态界面张力最低值低至10^-3mN/m数量级。分别在浓度为0.05%的CDS-1溶液和0.5%Na2CO3/0.05%CDS-1二元体系中加入不同浓度（浓度在500-2 500 mg/L范围内）的部分水解聚丙烯酰胺聚合物M2500,瞬时动态界面张力和平衡界面张力无明显变化,仍在10^-2mN/m数量级。该实验结果为河间油藏表面活性剂复合驱油配方的筛选提供了重要依据。

The interfacial tension（IFT） characteristics are caused by the interactions among alkaline,surfactant and polymer were investigated in Hejian reservoir（reservoir temperature is 90 ℃,the total salinity of produced water is 5 192.2 mg/L,the total salinity of flood water is 5 682.6 mg/L,Hejian crude oil）.The results demonstrated that the both dynamic and equilibrium IFTs could be lowered to the ultra-low magnitude of 10^-2 mN/m as the active concentration of sulfonate CDS-1 was in the range from 0.01% to 0.3%,Unfortunately,the characteristics were diversity if Na2CO3 is dissolved in 0.05% CDS-1 solution.The equilibrium IFTs increase or decrease unobviously with the increase of alkalinity and could be lowered to the ultra-low magnitude of 10^-2 mN/m.The dynamic IFTs were in the magnitude of 10^-3 mN/m as alkalinity is 0.5% in the alkali CDS-1 solution.The dynamic and equilibrium IFTs increase or decrease unobviously as well as HPAM M2500 is dissolved in the sulfonate CDS-1 or 0.5% Na2CO3/0.05%CDS-1 brine.The results provided the basis of selecting surfactant flooding formula in Hejian reservoir.