摘要
通过岩心流动实验,测定了80℃时胜利草桥某井地层水、两种磺酸盐类阴离子表面活性剂HD 1和HD 2的1%地层水溶液驱油时,油相和水相相对渗透率kro和krw的变化。岩心有刚玉砂胶结和高温灼烧地层砂填充两种,气体绝对渗透率约1.6μm2。相对渗透率用Welge Johnson公式表示。实验结果表明:与地层水相比,HD 1,特别是界面活性较高的HD 2使kro和krw有较大幅度提高,使残余油饱和度So和束缚水饱和度Sw相应降低;其中So由0.29分别降到0.26和0.25;与80℃时相比,在40℃下HD 1使kro明显减小,krw的减小则不明显;在地层砂填充岩心上,与地层水相比,HD 2使kro大幅度提高,So有一定程度降低,由0.28降到0.25,krw几乎无变化;表面活性剂(HD 2)对两种岩心相对渗透率的影响不同。讨论了影响相对渗透率各因素的作用机理,包括界面张力降低、润湿性改变及温度改变。图5表3参4。
The changes of relative permeability for oil phase,kro, and for water phase, krw, determined at 80℃ in oil displacement experiments on cores by formation water (FW) of Caoqiao, Shengli, and 1% solutions of anionic surfactants HD1 and HD2 in FW (HD1, HD2 solution) are investigated. Artificial cemented adamantine spar sand cores and burned reservoir sand packs are used with gas phase absolute permeability ～1.6 μm2. The values of kro and krware expressed by WelgeJohnsons equations. The experimental results show that: HD1 and interfacially more active HD2, in particular, increase kro and krw significantly and residual oil saturation, So, and irreducible water saturation, So, in relevant extents while So lowers from 0.29 to 0.26 and 0.25, respectively, comparing with FW; at 40℃ HD1 decreases kro notably and krw very slightly in comparison with the case of FW; on reservoir sand packs HD2 increases kro greatly, decreases So in some extent - from 0.29 to 0.25 and does not change krw practically as compared with the case of FW; surfactant HD2 exerts different effects on relative permeabity of the two kinds of cores. The mechanisms involved in influencing relative permeability by various factors are discussed: reduction of interfacial tension, changes in wattabilily and in termperature.
出处
《油田化学》
CAS
CSCD
北大核心
2003年第1期54-57,共4页
Oilfield Chemistry
