摘要
以流体可视化环道实验装置为依托,组装成水基泡沫润滑减阻实验系统,实验研究了60°倾斜管中稠油(黏稠流体)流动边界层在水基泡沫作用下的流动情况,获得了不同油流量及泡沫流量下硅油-泡沫两相流的流型特征和压降规律,并建立了倾斜管路中水基泡沫-稠油中心环状流压降模型.实验结果表明:实验条件下能形成稳定的硅油-泡沫中心环状流,泡沫和油没有出现明显的分层现象;当0.4<Qf/Qo(泡沫与硅油流量比)<0.75时,水基泡沫能有效润滑并隔离油壁界面,并形成较为稳定均匀的泡沫环,进而实现稠油流动减阻的目的,最大减阻率达74%,并能有效增加25%左右的输量;建立并验证了倾斜管路中稠油-水基泡沫中心环状流的压降预测模型,当0.3<Qf/Qo<0.8时,预测值与实验值吻合度较高,相对偏差介于±10%,但超出0.3<Qf/Qo<0.8的范围,此模型将不适用.
On the basis of visualized ring-road test devices, an experimental system of drag reduction and lubrication by injecting aqueous-base foam was designed. The flow behavior of the heavy oil flow boundary layer under the action of aqueous foam is studied using an experimental method in an inclined pipe line, with an inclination angle of 60°. The characteristics of the heavy oil-foam two-phase flow pattern and pressure drop graphs with different oil flows and aqueous-base foam flows are obtained from experimental data, and a predicting pressure drop model for the core flow of heavy oil-foam in inclined pipes is built. The experimental results show a stable core flow of heavy oil-foam forms in the experimental process, while the clear stratification phenomenon of foam and heavy oil did not emerge. When the flow ratios of foam and silicone oil are between 0.4 and 0.75, aqueous-base foam could effectively lubricate the wall of the tube to achieve reduced resistance and improve the transportation amount by approximately 25%. Furthermore the maximal drag-reduction efficiency could reach 74%. After verification by experimental data, the relative difference of the predicting pressure drop model, which exhibits improved predictability, is ±10% when flow ratios of foam and silicone oil are between 0.3 and 0.8. However, the model will not be suitable if the flow ratios of foam and silicone oil go beyond that range.
出处
《科学通报》
EI
CAS
CSCD
北大核心
2015年第7期681-688,共8页
Chinese Science Bulletin
基金
国家自然科学基金(51074136)
高等学校博士点基金(20115121110004)资助
关键词
水基泡沫
斜管路
稠油
边界层
减阻
aqueous-base foam, inclined pipe line, heavy oil, boundary layer, drag-reduction
