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以大庆外输含蜡原油为实验介质,利用自行研制的高压流变特性测试系统,测试了实验油样在氮气和天然气两种气质加压条件下,油气两相和油气水三相在不同剪切速率、含水率及压力下的粘温特性,探讨了氮气和天然气的溶解度对含蜡原油析蜡点和溶蜡点的影响。结果表明:在氮气和天然气两种气质加压条件下,油气两相和油气水三相混合物的视粘度均随剪切速率的增大而减小,且温度越低剪切稀释性越明显。在相同的压力条件下,原油含水率低于20%时,油样视粘度随着含水率的增大而增大。在低于泡点压力的条件下,当以天然气加压时,油气水三相和油气两相混合物的溶蜡点和析蜡点均随压力升高而降低,而以氮气加压时的变化规律与此相反,说明天然气溶解于原油有利于改善原油的流动性。
Taking Daqing oil-containing crude oil as the experimental medium and using the high-pressure rheological property test system developed by ourselves, the experimental oil samples were tested under different pressurization conditions of nitrogen and natural gas, Shear rate, moisture content and viscosity under temperature and pressure characteristics of the wax, explored the solubility of nitrogen and natural gas wax wax wax melting point and melting point. The results show that the apparent viscosity of oil-gas two-phase and oil-gas-water three-phase mixture decrease with the increase of shear rate under the conditions of both nitrogen and natural gas pressurization, and the shear dilution is more obvious with lower temperature. Under the same pressure condition, when the moisture content of crude oil is less than 20%, the apparent viscosity of oil sample increases with the increase of water content. At the pressure below the bubble point, when the natural gas is pressurized, the melting point and waxing point of the oil-gas-water three-phase and the oil-gas two-phase mixture both decrease with the increase of the pressure, while the change with the pressure of nitrogen Contrary to this, the law suggests that natural gas dissolved in crude oil is good for improving the liquidity of crude oil.