| 摘要: |
| 国内外学者关于临界携液流量的计算做了大量的研究,其中Turner模型和李闽模型应用较为广泛,这两个模型分别假设液滴为圆球形和扁平形,二者均没有考虑流动条件对携液气量的影响,将曳力系数取为常数,而高度湍流区雷诺数的变化对曳力系数影响较大,从而使模型的计算结果与现场实际数据吻合度较低。考虑到曳力系数随雷诺数变化而变化,部分学者引入曳力系数计算模型计算气井中液滴的曳力系数,但他们所采用的曳力系数计算模型不适用于高度湍流区曳力系数的计算。基于以上问题,本文考虑液滴变形对携液气量的影响,并引入GP模型计算高度湍流区液滴的曳力系数,建立了基于高度湍流条件下的气井临界携液流量新模型。将新模型与Turner模型、李闽模型进行对比和验证,结果表明,本文新模型的预测新结果与气井实际数据吻合最好,可以准确预测高度湍流条件下气井临界携液流量,对于气井的合理配产具有指导作用。 |
| 关键词: 临界携液流量 高度湍流 曳力系数 液滴变形 井底积液 |
| DOI： |
| 分类号: |
| 基金项目:国家油气重大专项“土库曼斯坦阿姆河右岸裂缝孔隙（洞）型碳酸盐岩气藏高效开发关键技术研究与应用”（2017ZX05030-003） |
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| A new prediction approach for continuous liquid carrying in gas wells considering droplet deformation and different flowing conditions |
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Research Institute of Petroleum Exploration and Development
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| Abstract: |
| Researchers from China and other countries have done many researches on calculating continuous liquid-carrying critical flow rate, most of the widely used critical liquid-carrying flow prediction models are Turner model and Li Min model. The great difference between them is on the different assumption that a liquid drop is spherical in Turner Model, while the liquid drop is deformed into flat shape in Li Min model. They both fail to consider the effect of different flow conditions that result in different flow regimes on the critical flow rate necessary to keep gas wells unloaded and assume the drag coefficient is constant. However, the variations of Reynolds number has a great influence on the drag coefficient in highly turbulent flow region, the discrepancies of the models with actual data were because flow regime considerations were ignored. Considering the variations of the drag coefficient with Reynolds numbers, some researchers have introduced the empirical relationships for the drag coefficient to calculate the drag coefficient of the drop in the gas well, but the models they have used are not suitable in the highly turbulent flow region. In order to solve the problem, we deduced a new prediction model to for continuous liquid-carrying in gas wells, which takes the effect of drop deformation on the minimum critical flow rate in a well into consideration, and introduces the GP model calculating the drag coefficient in highly turbulent flow regime. The proposed model and the models developed by Turner and Li Min are compared and validated with the actual data. The results show that the new model provides the prediction results in best coincidence with the actual state of gas wells. In conclusion, critical flow rate of gas wells in highly turbulent flow region can be predicted accurately by the new model, which is significant for gas production engineering planning. |
| Key words: critical liquid-carrying flow rate, highly turbulent flow regime, drag coefficient, liquid-droplet deformation, Liquid loading |
