低渗透油田双子表面活性剂降压增注实验研究

Research on Depressurization and Injection Augmenting Test with Gemini Surfactant in Low Permeability Oilfield

通过室内实验考察了H双子表面活性剂在临盘低渗透油田的降压增注效果。H双子表面活性剂的含量为0.05%～0.3%时,与此区块原油间的界面张力达到10^(-2)mN/m数量级,并且该活性剂可以使岩心片由强水湿性向弱水湿性方向转变。在岩心含油的情况下,注入H双子表面活性剂可降低注入压力,活性剂含量为0.2%时降压率最高,达30.9%。

The depressurization and injection augmenting effect of H gemini surfactant in Linpan low per- meability oilfield was studied in laboratory. When the content of H gemini surfactant is 0.05% to 0.3%, the interfacial tension between this gemini surfactant and the crude oil of this block reaches 10-2 mN/m or so, and this surfactant makes the wettability of core surface change from being strongly hydrophilic to being weakly hy- drophilic. Where there is crude oil inside the core, the injection pressure can be reduced by injecting Hgemini surfactant into the core, and the maximum pressure reduction percent can reach 30.9% when 0.2% of this surfactant is added.