基于无因次数选择的水平井含液率预测

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Ning Wu, Chengcheng Luo, Yonghui Liu, Nan Li, Chuan Xie, Guangqiang Cao, Changqing Ye, Hao Wang
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引用次数: 1

摘要

压力梯度预测是气井分析的关键。实验是了解水平气井流动特性最有效的方法。实验条件和高压条件之间最大的差异是气体密度,这可能导致建立的多相关联在应用于高压气井时不可靠。相似数被广泛用于预测流动特性。然而,很少有研究关注这一领域。此外,气井具有高气液比的特点;大多数经验关联是针对油井建立的,在低气液比条件下考虑较多,影响了气井模型的精度。本研究进行了气液流动的实验研究。首先,设计满足各流型的实验测试矩阵。其次,探讨了气速、液速、管径、含水率、倾斜角度对含液率的影响。随后,对所建议的相似数进行了调查,并对压力放大进行了评估。最后,建立了气井压力梯度综合预测模型。提供了现场数据来评估新的相关性。结果表明,Duns-Ros和改进Duns-Ros无量纲数不适合压力放大,而Hewitt-Robert数最适合压力放大。根据现场数据,与Hewitt-Robert Number相关的新方法优于广泛使用的压降相关方法,表明该方法可以用于预测气井压力梯度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Prediction of liquid holdup in horizontal gas wells based on dimensionless number selection
Pressure gradient prediction is crucial in gas well analysis. The experiment is the most effective method of understanding the flow characteristics in horizontal gas wells. The greatest difference between experimental and high-pressure conditions is gas density, which could cause the established multiphase correlations unreliable when they are applied to high-pressure gas wells. Similarity numbers are widely employed in predicting flow behavior. Nevertheless, few studies focused on this area. Additionally, gas wells are characterized as high gas-liquid ratio; the majority empirical correlations were developed for oil wells, which have a more consideration in low gas-liquid ratio, influencing the precision of gas well models. An experimental examination of gas-liquid flow has been carried out in this study. First, the experimental test matrix was designed to meet each flow pattern. Next, the effect of gas velocity, liquid velocity, pipe diameter, water-cut, and inclined angle on liquid holdup was explored. Subsequently, the similarity numbers suggested have been investigated and assessed for pressure scaling up. Finally, a comprehensive model was established, which was developed to forecast pressure gradient in gas wells. Field data was supplied to assess the new correlation. The results demonstrated that the Duns-Ros and the modified Duns-Ros dimensionless numbers were improper for pressure scaling up, whereas the Hewitt-Robert Number performs best. Based on field data, the new correlation with Hewitt-Robert Number was superior to extensively employed pressure drop correlations, showing that it can deal with predicting pressure gradient in gas wells.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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