作　　者： ; ; ; ; ; ;

机构地区： 中国石油化工集团公司

出　　处： 《油田化学》 2013年第3期354-357,共4页

摘　　要： 针对低渗透砂岩油藏储层低孔低渗导致注水压力高、欠注严重等问题,研制了带有酰胺基的阳离子双子表面活性剂BNFS(分子膜增注剂)。评价了BNFS的吸附性能、润湿性能、表界面活性及减阻性能,结果表明BNFS在砂岩表面吸附后形成分子膜层,岩心表面接触角从27.6°增至88.6°,由强亲水转为弱亲水。BNFS浓度为200mg/L时,溶液的表面张力为26.61mN/m,与煤油间的界面张力为0.06mN/m。岩心驱替实验表明,BNFS处理后,砂岩岩心的水相渗透率提高80%~120%,注水压力降低12%~18%。增注机理分析结果表明,在靠近孔壁处,分子膜增注剂、水与孔壁作用能级分别为10^(-18)、10^(20)J,分子膜增注剂与孔壁的综合作用能远大于水分子,在竞争吸附中占绝对优势,使有效渗流通道增加。BNFS处理岩心后,岩心-水的黏附功由136.5mN/m降至75.7mN/m,减阻作用明显。 Aiming at the problems such as high water injection pressure and severe shorting-injection resulting from the low porosity and low permeability in low permeability sandstone reservoir, the cationic surfactant with amide groups （BNFS） whose name was molecular injection agent was developed. The adsorption property, wettability, surface and interracial activity, and drag reduction performance of BNFS was evaluated. The results showed that a layer of molecular film formed after BNFS absorbed on the sandstone surface. The contact angle of sandstone surface was increased from 27.6~ to 88.6~, and the wettability of that changed from strong water wetting to slight water wetting. When the concentration of BNFS was 200 mg/L, the surface tension of solution was 26.61mN/m and the interracial tension with kerosene was 0.06 mN/m. The core flooding experiment results showed that water phase permeability of sandstone core increased 80%--120% and water injection pressure decreased 12%--18% by BNFS. The analysis result of molecular injection mechanism showed that the magnitude order of adsorption energy was 10-j8 J between molecular injection agent and hole wall, and that was 10-20 J between water molecule and hole wall. The adsorption energy of former was far greater than that of latter. Therefore, molecular injection agent had absolute advantage in the competitive adsorption to make effective seepage channel increase. The adhesion work between core and water molecule reduced from 136.5 mN/m to 75.7 mN/m after BNFS applied to core, which showed obvious drag reduction.

关 键 词： 低渗透 分子膜增注剂 减阻增注 机理 胜利油田

领　　域： [石油与天然气工程] [理学] [理学]