Prediction model of sustained annular pressure of gas wells under multi-factor coupling effect

doi:10.16265/j.cnki.issn1003-3033.2023.02.0841

Abstract

Abstract:

In order to understand the influence of tubing leakage, temperature effect and multi-annulus interaction on sustained annular pressure of gas wells, firstly, based on theories of heat transfer, engineering fluid mechanics and seepage mechanics, a prediction model of gas well sustained annular pressure under the coupling effect of multiple factors was established by fully considering the influence of tubing leakage, temperature pressure on annular fluid and pipe string and the interaction of multi-annulus. Then, the accuracy of the prediction model was verified based on field data of a gas well. Finally, a comparative analysis of annular pressure variation characteristics and parameter sensitivity was conducted under two conditions of considering multi-factor coupling and only considering tubing leakage. The results show that the established prediction model has a higher accuracy, which is 3.87% higher than that of the prediction model only considering the tubing leakage factor. Under the action of multi-factor coupling, annulus pressure has a "pressure inflection point" and the recovery process can be divided into: stage A of rapid growth, stage B of slow decline, and stage C of stable pressure. Under the conditions of the small tubing leakage point, initial annulus pressure, the small tubing inner wall pressure, and the shallow leakage point depth, the multi-factor coupling effect on the annulus pressure is more significant.

Key words: multiple factor coupling, gas wells, sustained annular pressure, prediction model, tubing leakage, temperature effect

LI Shuai, LIAN Zhanghua, DING Lingling, LIAO Tao. Prediction model of sustained annular pressure of gas wells under multi-factor coupling effect[J]. China Safety Science Journal, 2023, 33(2): 166-172.

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参数	数值
油管外径/mm	114.3
油管内径/mm	97.18
生产套管内径/mm	174.38
生产套管外径/mm	206.37
中间套管内径/mm	311.38
中间套管外径/mm	365.12
表层套管内径/mm	485.75
油管弹性模量/MPa	2.05×10⁵
套管弹性模量/MPa	2.10×10⁵
油管热膨胀系数/K^-1	1.2×10^-5
套管热膨胀系数/K^-1	1.25×10^-5
产量/(10 m³·d^-1)	30
封隔器位置/m	6 754.3
环空保护液密度/(g·cm^-3)	1.2
油管漏点位置/m	6 236.97
油管漏点当量直径/mm	0.1
初始环空压力/MPa	1.42
气柱高度/m	554.42