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首页> 外文期刊>Journal of natural gas science and engineering >Reprint of: Multiphase flow mechanism of sand cleanout with supercritical carbon dioxide in a deviated wellbore
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Reprint of: Multiphase flow mechanism of sand cleanout with supercritical carbon dioxide in a deviated wellbore

机译：转载：偏斜井筒中超临界二氧化碳清除沙的多相流机理

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Supercritical carbon dioxide (CO2) is of great interest as a sand-flushing fluid with significant potential advantages; therefore, it is of fundamental and practical importance to investigate its sand transporting mechanism. Numerical simulation was conducted to analyse the heat transfer along the whole deviated wellbore, and the results served as boundary conditions for the multiphase flow model of CO2 transporting sand. In addition, the physical properties of CO2 as a function of temperature and pressure were considered in the numerical simulation. The multiphase flow model was solved to investigate the effects of various factors on the sand transporting efficiency of CO2, including displacement, sand production rate and annulus eccentricity, in which the sand size distribution at the annulus entrance was set based on the measurement data from the experiments. The computed results show that the sand transporting efficiency decreases with inclination abruptly at first and subsequently increases, which is consistent with the experimental results. The inclination where sand is most difficult to transport varies from 48 to 72 degrees and depends on the sand's diameter and production rate at the bottom hole. The efficiency can be improved by increasing displacement with a trend that is greater at first and later slows. A larger sand production rate at the bottom hole means it is more difficult to transport sand. The efficiency decreases with increasing eccentricity at first and subsequently begins to increase when the eccentricity reaches 0.8. Under the same conditions, the pressure drop of sand-flushing with CO2 is 52.3% that observed with water. The results lay an important foundation for practical application. (C) 2015 Elsevier B.V. All rights reserved.
机译：超临界二氧化碳（CO2）作为一种具有显着潜在优势的洗砂液备受关注。因此，研究其输沙机理具有重要的现实意义。进行了数值模拟，分析了整个偏斜井眼的传热规律，并将其作为CO2运沙多相流模型的边界条件。另外，在数值模拟中考虑了CO 2的物理性质随温度和压力的变化。求解了多相流模型，以研究各种因素对CO2输砂效率的影响，包括位移，产砂率和环偏心率，其中基于来自环流入口的测量数据来设置环流入口处的沙粒尺寸分布。实验。计算结果表明，输沙效率起初随倾角突然减小，然后逐渐增大，与实验结果吻合。砂子最难运输的倾角在48至72度之间变化，并取决于砂子的直径和井底的生产率。可以通过增加排量来提高效率，这种排量的趋势是先增大后减小。底部孔的出砂率更高，这意味着更难以运输沙子。效率首先随着偏心率的增加而降低，然后在偏心率达到0.8时开始增加。在相同条件下，用CO2冲洗砂的压力降是用水观察到的52.3％。结果为实际应用奠定了重要基础。 （C）2015 Elsevier B.V.保留所有权利。

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