| 论文题目 | Simulation of Shallow Gas Invasion Process During Deepwater Drilling and Its Control Measures |
| 论文题目（英文） | Simulation of Shallow Gas Invasion Process During Deepwater Drilling and Its Control Measures |
| 作者 | Lei Yani;孙金;Wang Guangjian |
| 发表年度 | 2022-06-01 |
| 卷 | 21 |
| 期 | 3 |
| 页码 | 707-718 |
| 期刊名称 | JOURNAL OF OCEAN UNIVERSITY OF CHINA |
| 摘要 | |
| 摘要_英文 |
Shallow gas is considered one of the most serious geological hazards in deepwater drilling because it has the characteristics of suddenness and is difficult to deal with. To perform a quantitative evaluation of shallow gas risk during deepwater drilling, a numerical model for calculating gas invasion volume is established based on gas-water two-phase flow theory. The model considers the effect of the dynamic drilling process, and the influencing factors which affect the gas invasion volume are analyzed. Results indicate that the gas invasion rate and accumulated gas invasion volume increase with increasing bottom-hole pressure difference. A linear relationship exists between gas invasion volume and bottom-hole pressure difference. The duration of gas invasion increases as the shallow gas zone thickness increases, and the accumulated gas invasion volume grows as shallow gas zone thickness increases. The increase in formation permeability, water depth, and rate of penetration will enhance the gas invasion rate. However, these three factors can hardly affect the accumulated gas invasion volume. The gas flow rate increases significantly with increasing burial depth of shallow gas. On the basis of influencing factor analysis, a series of methods that consider different risk levels is proposed to control shallow gas, which can provide a reference for the prevention of shallow gas disasters during deepwater drilling.
|
Copyright © 中国科学院深海科学与工程研究所 备案证号：琼ICP备13001552号-1
琼公网安备 46020102000014号
地址: 三亚市鹿回头路28号 邮编：572000 网站维护：深海所办公室 邮箱：office@idsse.ac.cn
