The mechanism of continuously removing liquids from gas wells

doi:10.7623/syxb201204021

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (4): 681-686.DOI: 10.7623/syxb201204021

• Petroleum Exploration • Previous Articles Next Articles

The mechanism of continuously removing liquids from gas wells

WANG Zhibin　LI Yingchuan

Received:2011-10-28 Revised:2012-04-07 Online:2012-07-25 Published:2012-08-01

气井连续携液机理

王志彬　李颖川

西南石油大学油气藏地质及开发工程国家重点实验室　四川成都　610500

通讯作者: 王志彬
作者简介:王志彬，男，1982年3月生，2012年获西南石油大学油气田开发工程博士学位，现为西南石油大学讲师，主要从事采油、采气方面的教学和研究工作。
基金资助:
国家自然科学基金项目（No.51104125）资助。

Abstract

Abstract:

A liquid droplet is deformed and broken from an initial sphere to an oblate spheroid in parallel air flow, and low-viscosity liquid droplets differ significantly in the critical Weber number (We_crit ) that varies from 2.2 to 60. The currently used liquid loading models generally fail to comprehensively take the effect of differences in liquid-droplet deformation and size on the minimum flow rate for continuous-removal liquids from a gas well into consideration. Based on the liquid-droplet particle force equilibrium theory, we deduced a new model to predict the minimum flow rate of liquid loading, which introduces a characteristic parameter C_k,Wecrit that can describe the effect of differences in liquid-drop deformation and the maximum drop size on the minimum flow rate of liquid loading. A function to predict the drop deformation magnitude with different critical Weber numbers was deduced based on the general principle of energy conservation. The function prediction result is in a good agreement with experimental data given in literatures as well as the prediction made from the DDB model, with a deviation less than 6%. The C_k,Wecrit calculated by the new model changes from 2.14 to 4.79, while the C_k,We_crit derived from literature data and the inversion of minimum flow rates of various gas fields in China ranges from 1.86 to 5.0. Therefore, this new model can theoretically explain the reasons why minimum flow rates of various gad fields differ significantly and individual gas wells have such a low minimum flow rate. Finally, several gas wells in the Daniudi gas field were taken as an examples to demonstrate the use of the model.

Key words: liquid loading in gas well, liquid-droplet deformation, critical Weber number, liquid-droplet model, critical delivery

摘要：

平行气流中的液滴趋于椭球状，而低黏度液滴临界韦伯数 We_crit相差较大，在2.2~60变化，而已有的携液模型未综合考虑液滴变形和液滴尺寸差异对气井临界携液气量的影响。根据液滴质点力平衡理论,笔者导出了气井临界携液气量预测新模型。新模型引入的特征参数 C_k,Wecrit综合考虑了液滴变形和最大液滴尺寸差异对携液气量的影响。根据一般能量守恒原理，推导出了液滴变形程度与临界韦伯数的函数关系，计算结果与实验数据和DDB模型预测结果一致，误差小于6%。新模型的关系式系数 C_k,Wecrit在2.14～4.79变化，而根据文献数据和国内气田临界气流量反算的系数 C_k,Wecrit在1.86~5.0变化。新模型从机理上解释了各气田临界携液气量相差较大和个别气田临界携液气量较低的原因，并以大牛地气田为例介绍了该模型的应用。

关键词: 气井携液, 液滴变形, 临界韦伯数, 液滴模型, 临界流量

WANG Zhibin　LI Yingchuan. The mechanism of continuously removing liquids from gas wells[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(4): 681-686.

王志彬　李颖川. 气井连续携液机理[J]. 石油学报, 2012, 33(4): 681-686.

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The mechanism of continuously removing liquids from gas wells

气井连续携液机理

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