摘要：As deep natural gas resources develop, conventional plunger lift are often inadequate due to their high startup pressure, significant leakage, and frequent lift failures. For gas wells with a great burial depth, slow pressure recovery during the buildup stage, and low gas-liquid ratio (GLR), the multistage plunger lift can more effectively deliquification, reduce startup pressure, and enhance lifting efficiency. Currently, the application of multistage plunger lift in the field is limited and experimental, with no theoretical research reported on this subject. The operational mechanism and process adaptability of multistage plunger lift remain unclear, and existing dynamic simulation software cannot model their operational processes. This study develops a transient model for multistage plunger lift based on their operational mechanism, considering plunger force balance, dynamic reservoir inflow, liquid leakage and gas migration during plunger movement, and interaction forces between dual plungers. Simultaneously, sensitivity and adaptability analyses were conducted based on the established model to determine the optimal operating conditions for the multistage plunger. Additionally, a full-scale visual plunger lift experimental setup was constructed to compare the lifting efficiencies of conventional and multistage plunger lift and to investigate the operational conditions of multistage plunger lift at different liquid heights. The findings indicate that, for ultra-deep gas wells, multistage plunger lift can effectively reduce startup pressure and, under certain conditions, outperform conventional plunger lift in gas well deliquification. ? 2025 Elsevier B.V.

ISSN号：2949-8910

卷、期、页：卷246

发表日期：2025-03-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Geoenergy Science and Engineering

参与作者：Jia, Youliang,Tian, Wei,Gong, Hangfei

通讯作者：邢志晟,左昊龙,江文博

第一作者：韩国庆,梁星原

论文类型：期刊论文

论文概要：邢志晟,韩国庆,Jia, Youliang,Tian, Wei,Gong, Hangfei,左昊龙,江文博,梁星原，Mechanistic modeling and experimental study of multistage plunger lift for liquid unloading in ultra-deep gas well，Geoenergy Science and Engineering，2025，卷246

论文题目：Mechanistic modeling and experimental study of multistage plunger lift for liquid unloading in ultra-deep gas well