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In the mid-to-late stages of shale gas development, wellbore liquid accumulation poses a significant challenge. Dual plunger lift systems have emerged as a critical technology for maintaining gas well productivity by improving drainage efficiency. However, the dynamic behavior of dual plungers under complex gas-liquid coupling conditions remains poorly understood. This study develops a comprehensive dynamic model for dual plunger lift systems, focusing on the motion characteristics of the plungers during the upstroke phase. The model incorporates key pressure and gas-liquid distribution, and the effects of system parameters such as liquid column height and plunger seat depth. Case studies demonstrate that the upper plunger’s velocity decreases when lifting liquid, while the lower plunger’s velocity increases. Additionally, increasing the installation depth of the upper plunger seat reduces the upward stroke time. These findings provide valuable guidance for optimizing dual plunger lift systems, enhancing gas well performance.

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Dynamic Modeling and Analysis of Dual Plunger Lifting System for Deliquification of Shale Gas Wells

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaoyong Yang,
  • Donghong Dang,
  • Keyu Ding,
  • Xiuli Gao,
  • Chunsheng Gao,
  • Zuofan Bao

摘要

In the mid-to-late stages of shale gas development, wellbore liquid accumulation poses a significant challenge. Dual plunger lift systems have emerged as a critical technology for maintaining gas well productivity by improving drainage efficiency. However, the dynamic behavior of dual plungers under complex gas-liquid coupling conditions remains poorly understood. This study develops a comprehensive dynamic model for dual plunger lift systems, focusing on the motion characteristics of the plungers during the upstroke phase. The model incorporates key pressure and gas-liquid distribution, and the effects of system parameters such as liquid column height and plunger seat depth. Case studies demonstrate that the upper plunger’s velocity decreases when lifting liquid, while the lower plunger’s velocity increases. Additionally, increasing the installation depth of the upper plunger seat reduces the upward stroke time. These findings provide valuable guidance for optimizing dual plunger lift systems, enhancing gas well performance.