油溶性降黏剂降黏性能研究

Viscosity Reducing Properties of Oil-Soluble Solvent for Heavy Oil

李爱芬[]王金杰赵 琳袁忠超张玉立

LI Ai-Fen WANG Jin-Jie ZHAO Lin YUAN Zhong-ChaoZHANG Yu-Li

针对胜利油田现河稠油，研究了7种油溶性降黏剂（Y-1~Y-7）及其复配体系的降黏性能，考察了降黏剂加量、原油含水率对降黏效果的影响，研究了降黏剂对蒸汽驱油效果的影响。结果表明：当油溶性降黏剂质量分数小于5%时，原油降黏率随降黏剂加量的增加而迅速增大，之后增加缓慢，加量为15%时的降黏率可达90%以上(Y-4除外)。Y-3和Y-7按质量比1:1复配后的降黏效果最好，总加量5%、10%时的原油降黏率分别为76.1%和93.14%。不含降黏剂时，随原油含水率增加原油黏度先增加后降低，原油含水50%时的黏度是不含水原油的3.9倍，形成W/O型乳状液。不同含水率下，加入降黏剂后原油黏度大幅降低；随含水率增加，原油降黏率先降低后增加，含水率10%时达到最低（Y-1除外）。稠油蒸汽驱前注入0.009~0.027 PV油溶性降黏剂，采收率增幅为2.8%~6.0%。

The oil viscosity reducing properties of oil-soluble solvents(Y-1—Y-7) and their compound system were studied according to the heavy oil of Xianhe area in Shengli oilfield. The effect of these solvents dosage and water cut of oil on viscosity reducing was investigated, and that of the solvents on steam flooding process was also studied. The results showed that the viscosity reducing rate of heavy oil increased rapidly with increasing solvents dosage when the mass concentration of the solvents was less than 5%, and then increased slowly. When the mass concentration of solvents was up to 15%, the viscosity reducing rate of these solvents except Y-4 was greater than 90%. A combination of Y-3 and Y-7 in mass ratio 1:1 achieved the best viscosity reduction effect whose viscosity reduction rate was 76.1% and 93.14 % with the sum dosage of 5% and 10%, respectively. The viscosity of heavy crude oil without viscosity reducing solvent increased first and then decreased with increasing water cut. The viscosity of oil with 50% water cut was 3.9 times than that of pure oil, and W/O emulsion was developed. After adding viscosity-reducing solvents, the viscosity of oil greatly decreased and the viscosity reduction rates of oil-water system decreased first and then increased with increasing water cut which achieved the minimum with 10% water cut except Y-1. The recovery factor increase of steam flooding of heavy oil was 3.1%—6.3% when 0.009—0.027 PV viscosity-reducing solvents were injected in advance.