Abstract: In this paper, Changqing crude oil was emulsified under pressure in different dissolved gas environments (CO2, CH4, N2) by using crude oil emulsifier with pressure dissolved gas. The solubility (Rs) , water separation rate (fv), interfacial tension (γ), interfacial modulus of elasticity (εd), viscosity of dissolved gas crude oil (μ) and apparent viscosity of dissolved gas crude oil emulsion (μap) were measured by means of solubility measurement device, emulsion stability analysis device, interfacial tension tester and high pressure rheometer. The results show that the presence of oil⁃water interfacial film inhibits the migration of gas from the outer phase to the inner phase to a certain extent, so that the solubility of the dissolved gas oil emulsion is less than the solubility of the internal and external phases. Under the environment of dissolved CO2, because of the minimum interfacial tension between oil and water, the best emulsification effect is obtained, and the W/O emulsion droplets with pressure are the most compact. Under the environment of dissolved CO2, because of its minimum interfacial tension between oil and water, the smallest droplets are formed in W/O emulsion and the emulsifying effect is the best. At the same time, due to the elastic modulus of oil⁃water interface is the largest, the emulsion system is the most stable, and the viscosity ratio of emulsion system is the most obvious than that of crude oil system. In contrast, in the environment of N2 dissolution, the stability of the emulsion system is poor, and it is easy to demulsify.

Key words: Crude oil emulsion, Solubility, Stability, Interface characteristics

摘要： 　利用带压溶气原油乳化装置在不同溶气环境（CO2、CH4、N2）下对长庆原油进行带压乳化，并通过溶解度测定装置、溶气原油乳液稳定性分析装置、界面张力仪、高压流变仪测得不同气体的溶解度Rs、分水率fv、界面张力γ、界面膜弹性模量εd、溶气原油黏度μ，溶气原油乳状液表观黏度μap。结果表明，油水界面膜的存在会在一定程度上抑制气体从外相向内相的迁移，使溶气原油乳状液的溶解度小于内外相各自的溶解度之和；在溶CO2的环境下，由于其油/水界面张力最小，使其乳化效果最好，形成的带压W/O型乳状液乳滴最为细密，同时由于其油水界面弹性模量最大，形成的带压乳液体系最为稳定，乳液体系较原油体系的增黏率最明显；与之相反，在溶N2的环境下，带压乳液体系的稳定性较差，易于破乳。

关键词: 原油乳状液, 溶解度, 稳定性, 界面特性