Theory of Enhanced Liquid Carrying with Multiphase Flow and Key Technologies of Drainage Gas Recovery in Gas Wells

BAI Bofeng; TIAN Wei; ZHAO Kunpeng; JIA Youliang; LI Li; YANG Xudong; ZHAO Zhengyan; LI Xuri; SHEN Zhihao; LIU Lei

doi:10.7652/xjtuxb202405002

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Theory of Enhanced Liquid Carrying with Multiphase Flow and Key Technologies of Drainage Gas Recovery in Gas Wells

更新时间：2025-07-28

- Theory of Enhanced Liquid Carrying with Multiphase Flow and Key Technologies of Drainage Gas Recovery in Gas Wells
- Vol. 58, Issue 5, Pages: 10-18(2024)
- 作者机构：
  
  1. 西安交通大学绿色氢电全国重点实验室,西安,710049
  2. 中国石油长庆油田公司油气工艺研究院,西安,710018
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202405002
  CLC： TE37
- Online First：10 May 2024，
  
  Published：2024
- 稿件说明：
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BAI Bofeng, TIAN Wei, ZHAO Kunpeng, et al. Theory of Enhanced Liquid Carrying with Multiphase Flow and Key Technologies of Drainage Gas Recovery in Gas Wells[J]. 2024, 58(5): 10-18.
DOI：

BAI Bofeng, TIAN Wei, ZHAO Kunpeng, et al. Theory of Enhanced Liquid Carrying with Multiphase Flow and Key Technologies of Drainage Gas Recovery in Gas Wells[J]. 2024, 58(5): 10-18. DOI： 10.7652/xjtuxb202405002.

摘要

天然气田稳产是保障我国能源安全的重大需求

气井积液是制约稳产的瓶颈

排液采气是保障稳产的关键。我国60%气井因积液年均产气量递减23%以上

且积液井数以年均5%的速率快速递增。由于对气井多相流动特性认识不足

传统排液采气技术仅适用于积液轻微的浅直井且排液率较低。研究团队近年来聚焦天然气井排液采气难题

构建了基于气液流动结构调控的强化携液理论

突破了经典临界流速携液理论仅适用于环雾状流的局限; 发明了抗油耐矿化度泡沫排液、复杂井筒速度管柱排液、超声速喷嘴雾化排液、气举柱塞接力举升排液等适用气井不同积液状态的高效低成本排液采气系列关键技术。研究成果已推广至长庆气田、中外合作开发区等11个气区

累计应用近12 000口气井

占我国积液气井总数的30%以上。

Abstract

Ensuring a continuous supply of gas resources is a crucial requirement for China's energy security. However

the steady production of gas wells is often hindered by the issue of liquid loading. To maintain a consistent gas production

it is important to implement effective drainage and gas recovery technologies. In China

60% of the gas wells undergo liquid loading

resulting in production declining by more than 23% per year

and the worse part is that the number of liquid loading wells annually increases by 5%. The conventional method of drainage gas recovery is only appropriate for shallow vertical wells with minimal gas outflow and brings about a low drainage efficiency since the multiphase flow characteristics of gas wells are not well understood. Therefore

this paper will highlight the current research conducted by our team on the theory of enhanced liquid carrying in multiphase flow and the key technologies of drainage gas recovery in gas wells. We proposed the theory of enhanced liquid carrying

which revolves around the regulation of gas-liquid flow structure. It overcomes the constraint of the traditional critical liquid carrying theory

which is only applicable to annular-mist flow. We developed a set of key technologies for efficient and cost-effective drainage gas recovery that is suitable for various liquid loading states in gas wells under different liquid loading conditions

including oil-resistant and salinity-resistant foam drainage

complex wellbore velocity string drainage

supersonic nozzle atomization drainage

plunger relay lift drainage

and more. The theoretical and technical achievements have been applied to 11 gas fields and 12 000 gas wells

accounting for more than 30% of all the liquid-loading gas wells in China.

关键词

Keywords

references

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