新疆深层稠油井筒掺稀降黏举升摩阻分析

Xinjiang deep heavy oil wellbore blending diluting lift friction drag analysis

新疆深层稠油在井筒举升过程中,由于温度的降低,原油会逐渐失去流动性。掺稀油是有效降低井筒摩阻的方式。根据现场掺稀工艺建立室内模拟测量装置,模拟了掺稀过程中稠油和稀油的动态混合过程,并测量得到沿井筒温度降低过程中混合物的黏度变化;结合井筒传热及流动模型,模拟分析了不同掺稀比条件下的井筒摩阻。分析结果表明,掺稀比的增加能有效降低摩阻,但是单位稀油对摩阻降低的贡献随掺稀比增加而降低。

During the artificial lift to Xinjiang deep heavy oil reservoir, crude oil gradually losing mobility with temperature de- creasing is a serious problem. The light oil blending is an effective way to reduce wellbore friction. In this work, the indoor simulation measurement device was built according to the in-situ light oil mixing technique to study the light oil and its dynamic mixing process during the process of light oil addition. And then variation of the mixture viscosity with the decrease of we｜lbore temperature is also measured. Combined with the wellbore heat transfer and fluid flow model, the wellbore friction is calculated and analyzed under different light oil ratios. Study results show that the increase of the light oil ratio is able to decrease the friction effectively, but the contribution of unit light oil for friction fall decreases with the rise of light oil ratio.