SV值表征的稠油W/O乳状液稳定性研究

Stability of Heavy Crude Water-in-Oil Emulsion Characterizing by SV Value

齐霖艳 李美蓉 盖平原 曹嫣镔 唐培忠

QI Lin-Yan LI Mei-Rong GAI Ping-Yuan CAO Yan-Bing TANG Pei-Zhong

采用灰色关联熵分析法研究了胜利油田典型区块稠油W/O乳状液稳定性与稠油组成（极性四组分、有机杂原子与过渡金属含量）和油品性质（稠油极性组分偶极矩）的关联，结合稠油W/O乳状液液滴的粒径大小分布及稠油极性四组分Zeta电位，分析了乳状液的稳定机理。用SV值表征乳状液稳定性，SV值越大，乳状液稳定性越好。结果表明，极性四组分、有机杂原子与过渡金属含量与乳状液SV值的关联度从大到小分别为：胶质(0.9945)>饱和分(0.9928)>芳香分(0.9901)>沥青质(0.9597)，N (0.9993)>O (0.9918)>S (0.9667)，Ni (0.9891)>Fe (0.9852)>V (0.9845)，胶质、N及Ni含量与SV值的关联度最大，对乳状液稳定性有重要影响。稠油极性组分偶极矩与SV值的关联度依次为：胶质(0.9929)>沥青质(0.9916)>芳香分(0.9796)，胶质的偶极矩是影响乳状液稳定性的关键因素。3-12-182区块稠油的极性四组分Zeta电位绝对值最大，W/O乳状液中液滴粒径最小、尺寸分布最集中（0.5~1.5），SV值最大（1026.70），乳状液最稳定。

The relationships between the stability of W/O emulsion in five typical blocks of Shengli oilfield and the compositions of heavy oil, including the content of polar fractions, heteroatom and transition metals, as well as the properties of heavy oil, such as the mean dipole moment of polar fractions, were studied by gray correlation entropy method. At the same time, the microcosmic image of W/O emulsion and the Zeta of polar fractions were also studied in order to analyze the stability mechanism of W/O emulsion. SV value was used to represent the stability of the emulsion, the larger of SV value, the more stable of the emulsion. The results showed that four polar fractions, three heteroatoms and three transition metals were arranged according to the degree of association with SV value in following order: resin (0.9945)>saturate (0.9928)>aromatic (0.9901)>asphaltene (0.9597), N(0.9993)>O (0.9918)>S (0.9667), Ni (0.9891)>Fe (0.9852)>V (0.9845). The degree of association between the content of resin, N and Ni and SV value were the biggest which indicated that they were the main factors influencing the stability of W/O emulsion. The polar fractions were arranged according to the degree of association between mean dipole moment and SV value in following order: resin (0.9929)>asphaltene (0.9916)>aromatic (0.9796). The mean dipole moment of resin was the key factor that affecting the stability of emulsion. The mean dipole moment of resin was the key factor influencing the stability of W/O emulsion. The W/O emulsion of heavy oil in 3-12-182 block was the most stable with the biggest Zeta of polar fraction absolute value, the smallest of droplet size, the most concentrated size distribution (0.5—1.5) of droplets and the largest SV value (1026.70)