高胶质稠油掺稀降黏技术

Viscosity Reducing Recovery Technology of Heavy Oil by Mixing Light Oil

针对中原油田濮深18块稠油油藏特点和稠油性质,进行了稠油掺稀降黏规律和流变性室内实验研究。采用4种类型稀油对PS18-1井超稠油进行定温条件下不同掺稀比的稠油降黏实验,并将实验测得的稠油掺稀黏度数据进行拟合后得到模型参数。实验结果表明:对于PS18-1超稠油,在同等条件下4种稀油中文一联稀油掺稀降黏的效果最佳;掺入的稀油量越大,混合油黏度越低,降黏效果越好;井口温度越高,需要掺入的稀油量越小。在无外加降黏剂或互溶剂时掺稀比1∶1.5时就无法实现稠稀互混。用文一联稀油对PS18-1超稠油在130℃条件下互混,掺稀比在1∶1.8以下时基本可实现完全互混,但温度下降后仍有少许块状物析出。当井口温度为40℃时,PS18-1超稠油与文一联稀油按掺稀比1∶2混合时,井口混合油黏度为249 m Pa·s,能满足生产要求。当井口温度为60℃时,PS18-1超稠油与文一联稀油按掺稀比1∶1.8混合,井口混合油黏度为356 m Pa·s,也能满足生产要求。此外,模型计算值与实验值吻合较好,具有较高的计算精度。

Based on the characteristic of the reservoir and the nature of the viscous crude oil of Pushen 18 oil region in Zhongyuan Oilfiled, the laboratory experiment on the rheological property and the law of the viscosity break by mixing the heavy oil with the thin oil were taken through. Under the constant temperature, the PS18-1 Ultra heavy oil was mixed with four different types of thin oil with different proportion, and the model parameters were obtained by fitting the experimental value. The result revealed that,under the same conditions, the best viscosity break efficiency was achieved when mixing the PS18-1 heavy oil with the Wen Yilian thin oil. Moreover, the bigger volume the thin oil mixed, the lower the viscosity turned into. In addition, the higher the wellhead temperature, the smaller amount of the thin oil needed. The heavy oil and the thin oil could not be mixed with the volume ration of 1∶1.5 without the viscosity reducer. The PS18-1 could be totally mixed with wenyi thin oil under 130℃ at volume ration of 1∶1.8,however, few cakes would be flushed out when the temperature descended. At the wellhead temperature of 40℃, the mixture oil viscosity was 249 m Pa·s by mixing the heavy oil with the Wen Yilian thin oil at volume ratio of 1∶2, which could meet the production requirements. Besides, at the wellhead temperature of 60℃, the mixture oil viscosity was 356 m Pa·s at the volume ratio of 1：1.8, which also could meet the production requirements. In addition, the model calculation fit well with the experiment value and had high accuracy degree.