塔河油田稠油掺稀井下静态混合器模拟研究

发布时间：2018-07-13 12:46

【摘要】：目前塔河油田主要使用液力反馈泵对稠油进行掺稀降黏生产,生产过程中出现了井口黏度波动大、悬点载荷波动大以及抽油杆断脱严重等问题,造成这些问题的主要原因是掺稀过程中稠油和稀油相互混合不均匀。为了能够直观地显示掺稀降黏过程中稠油与稀油的混合效果,本文采用数值模拟方法对光管环空掺稀以及加入静态混合器之后的环空掺稀过程进行了研究。首先,利用Gambit软件进行建模,并使用计算机流体力学软件Fluent对光管环空掺稀以及加装了SK型和SD型静态混合器的环空掺稀过程进行了数值模拟,得到了混合油在以上三个模型中外部条件相同情况下的混合结果,并进行了对比和分析。结果表明,加入静态混合器能够提高混合油的均匀程度,能够提高掺稀降黏的效果。其次,对SK型及SD型静态混合器掺稀效果进行对比分析,结果表明在混合元件数量相同的条件下,SK型静态混合器的降黏效率要优于SD型静态混合器；而且SK型静态混合器元件可靠性更好,造成的压力损失也更小。最后,对SK型静态混合器进行了元件排列角度敏感性分析,分析表明SK型混合元件两两90°角对接下入油管中造成的压降最小,混合效率最高。并对优化后的混合器模型进行了掺稀比敏感性分析,得到结论：掺稀比越大,混合油的黏度越低,降黏效果越好。在使用SK型静态混合器时,推荐使用的掺稀比为0.5。本文的研究结果为加深对稠油环空掺稀降黏工艺的理解提供了参考,也对提高混合效果、减少或消除由于混合不均匀所导致的黏度波动大、悬点载荷波动大等生产问题有一定的指导意义。
[Abstract]:At present, the hydraulic feedback pump is mainly used in the production of viscous oil with dilute viscosity reduction. During the production process, there are some problems such as large fluctuation of wellhead viscosity, large fluctuation of suspended load and serious break off of sucker rod, etc. The main reason for these problems is that the heavy oil and the thin oil are mixed inhomogeneously. In order to visualize the mixing effect of heavy oil and thin oil in the process of mixing dilute viscosity reduction, the mixing process of thin ring space and that after adding static mixer is studied by numerical simulation method in this paper. Firstly, Gambit software is used to model the model, and fluent is used to simulate the process of optical tube ring dilute and SK type and SD type static mixer. The mixing results of the mixed oil under the same external conditions in the above three models are obtained and compared and analyzed. The results show that the addition of static mixer can improve the uniformity of the mixture oil and the effect of dilute viscosity reduction. Secondly, the mixing effect of SK type and SD type static mixer is compared and analyzed. The results show that the viscosity reduction efficiency of SK-type static mixer is better than that of SD type static mixer under the same number of mixing elements. Besides, SK static mixer has better reliability and less pressure loss. Finally, the sensitivity analysis of the array angle of SK static mixer is carried out. The results show that the pressure drop is the least and the mixing efficiency is the highest when the SK type mixing element is docked at 90 掳angle. The sensitivity analysis of the optimized mixer model shows that the higher the blending ratio is, the lower the viscosity of mixed oil is and the better the viscosity reduction effect is. When using SK static mixer, the recommended dilution ratio is 0.5. The results of this paper provide a reference for further understanding of viscous oil annular viscosity reduction technology, and also improve mixing effect and reduce or eliminate the viscosity fluctuation caused by uneven mixing. The production problems such as heavy load fluctuation at suspension point have certain guiding significance.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE937

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