三元复合体系在渗流过程中的乳化规律研究

Emulsion Forming Rules of ASP System Seepage Flow in Porous Media

王克亮[] 付恬恬 王翠翠 明阳阳

WANG Ke-Liang FU Tian-Tian WANG Cui-Cui MING Yang-Yang

三元复合体系在渗流过程中形成的乳状液类型和乳化程度直接影响其注入能力和驱油效果。本文采用中间带2个取样口的90 cm均质长岩心模型，研究了中(60%~80%)、高(85%~95%)含水率条件下，水解聚丙烯酰胺（相对分子质量2500×104）、石油磺酸盐表面活性剂、Na2CO3三元复合体系与大庆原油在岩心渗流过程中乳状液的生成规律。低、中、高层渗透率分别约为300×10-3、1500×10-3、2500×10-3 μm2。研究结果表明，在中含水率条件下（60%~80%），距低渗透岩心入口30、60 cm和出口处，开始乳化时的复合体系注入量分别为0.3、0.4、0.84 PV，乳化效果较好时的注入量分别为0.48、0.6、0.94 PV。在高含水率条件下（85%~95%），相同测压点开始乳化时的复合体系注入量分别为0.41、0.49、0.86 PV，乳化效果较好时的注入量分别为0.49、0.63、0.97 PV。中、高渗透率岩心的乳化规律基本相似。含水率相同时，三元复合体系在低渗透率岩心渗流过程中出现乳化的时机早，注入量约0.8 PV时，岩心出口端开始乳化，且乳状液的颜色较深，乳化效果好；在高渗透率岩心中，出现乳化的时机晚，注入量约1.0 PV时，岩心出口端开始乳化，乳状液的颜色较浅，乳化效果差。岩心渗透率相同时，中含水率条件下，出现乳化时机较早，乳化效果较好。

Emulsifying types and emulsifying degree of ASP system seepage flow in porous media impacted the injection ability and flooding efficiency of the system. The passage adopted a 90 cm homogeneous core model with two sampling windows in the middle. The emulsion forming rule of ASP system consisting of hydrolyzed polyacrylamide(relative molecular mass 2500×104 ), petroleum sulfonate surfactant and Na2CO3 and Daqing oil seepage flow in the core was studied, which was under the condition of medium and high water ratio. The permeability of low, medium and high-level was approximately 300×10-3、1500×10-3、2500×10-3 μm2. The results showed that in middle moisture (60%—80%), ASP system injection of starting to emulsify was 0.3, 0.4 and 0.84 PV, and that of having good emulsifying effect was 0.48, 0.6 and 0.94 PV respectively, where was 30, 60 cm from low permeability cores entrance and exit. In high moisture (85%—95%), compound system injection of starting to emulsify was 0.41, 0.49 and 0.86 PV, and that of gaining good emulsifying effect was 0.49, 0.63 and 0.97 PV respectively in same pressure points. The emulsion laws of medium and high permeability cores were similar. When water ratio was the same, ASP system in low permeability rock appeared emulsion first. When the injection was about 0.8 PV, emulsify appeared in rock export with deeper color emulsion and good emulsion effect. In high permeability rock, the time of appearing emulsion was late. When the injection was about 1.0 PV, emulsify appeared in rock export with lighter color emulsion and bad emulsion effect. When the core permeability was the same, the emulsification of ASP system would appear earlier and the emulsifying effect was better under medium water ratio.