气井环空内泄漏气泡瞬态运移特性研究

doi:10.16265/j.cnki.issn1003-3033.2023.11.1653

中国安全科学学报 ›› 2023, Vol. 33 ›› Issue (11): 89-96.doi: 10.16265/j.cnki.issn1003-3033.2023.11.1653

气井环空内泄漏气泡瞬态运移特性研究

丁亮亮¹(), 朱海¹, 陈文康¹, 刘永辉², 张强¹

¹ 西南石油大学机电工程学院,四川成都 610500
² 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

收稿日期:2023-05-16 修回日期:2023-08-26 出版日期:2023-11-28
作者简介:
丁亮亮 (1983—),男,安徽安庆人,博士,副教授,主要从事石油机械、油气井管柱力学和井完整性评价方面的理论与应用技术研究。E-mail: lld1210@163.com。
刘永辉教授
张强讲师
基金资助:
国家自然科学基金资助(51704034)

Study on transient migration characteristics of leaking bubble in gas well annulus

DING Liangliang¹(), ZHU Hai¹, CHEN Wenkang¹, LIU Yonghui², ZHANG Qiang¹

¹ School of Mechatronic Engineering, Southwest Petroleum University, Chengdu Sichuan 610500, China
² State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu Sichuan 610500, China

Received:2023-05-16 Revised:2023-08-26 Published:2023-11-28

摘要/Abstract

摘要：

为了探究气井泄漏气体对环空带压的影响,根据气井环空内气体运移特点,综合考虑气泡在环空运移过程中受浮力、重力、黏性阻力、附加质量力和Basset力,建立持续环空带压井的气泡瞬态运移预测模型;基于相似原理设计环空气体瞬态运移试验装置,开展试验,探究不同注气量下气体瞬态运移特性,并验证气泡瞬态运移模型的可靠性;针对典型气井油套持续环空带压过程,开展敏感性分析。结果表明:气泡直径、泄漏点压力、温度与液体密度是影响气泡运移速度的主要因素;气泡运移速度越快,持续环空带压恢复的时间越短,气井环空压力无法及时卸载,导致井筒安全性降低。

关键词: 气井, 环空带压, 泄漏气体, 气泡运移, 瞬态运移

Abstract:

In order to study the effect of gas leakage on annular zone pressure, a prediction model of bubble transient migration was established based on the characteristics of gas migration in the gas well, considering buoyancy, gravity, viscous resistance, additional mass force, and Basset force. Based on the similarity principle, an experimental device for the transient migration of annular gas was designed to study the transient transport characteristics of gas under different injection volumes. The reliability of the bubble transient transport model was verified by the experimental results. Sensitivity analysis was carried out for the process of sustained casing pressure in typical gas wells. The results demonstrate that the key factors impacting bubble migration speed are bubble diameter, leakage pressure, temperature, and liquid density. The higher the bubble migration rate is, the shorter the sustained annular pressure recovery time is, and the annulus pressure of a gas well cannot be discharged in time, resulting in lower well safety.

Key words: gas well, sustained casing pressure, gas leakage, bubble migration, transient migration

丁亮亮, 朱海, 陈文康, 刘永辉, 张强. 气井环空内泄漏气泡瞬态运移特性研究[J]. 中国安全科学学报, 2023, 33(11): 89-96.

DING Liangliang, ZHU Hai, CHEN Wenkang, LIU Yonghui, ZHANG Qiang. Study on transient migration characteristics of leaking bubble in gas well annulus[J]. China Safety Science Journal, 2023, 33(11): 89-96.

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名称	实际井参数	试验参数
套管直径/mm	201.7	50
套管壁厚/mm	15.12	4
管柱斜度/(°)	90	90
高度/m	4 038.7	10
弹性模量/MPa	210	3.0

变量	数值
泄漏点压力/MPa	3
温度/℃	20
环空保护液密度/(kg·m^-3)	998
气泡初始直径/mm	6
表面张力/(N·m^-1)	0.071

变量	数值
泄漏点压力/MPa	70
温度/℃	100
环空保护液密度/(kg·m^-3)	998
气泡初始直径/mm	2
表面张力/(N·m^-1)	0.071
油管外径/mm	114.3
生产套管内径/mm	171.45
天然气相对密度	0.62

气井环空内泄漏气泡瞬态运移特性研究

Study on transient migration characteristics of leaking bubble in gas well annulus

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