富co2煤层气井生产特征及吸附控制机理

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Zeyuan Sun, Xiaodong Zhang, Caifang Wu, Shibing Li, Jifu Zhang, Xianzhong Li, Shuo Zhang
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引用次数: 0

摘要

为研究富二氧化碳煤田煤层气井产能规律,选取富不同浓度CO2的甘肃省姚街煤田海石湾煤矿为研究区。采用数值模拟技术,对煤层气井的产能进行了模拟,探讨了影响气体吸附差异对产能影响的热力学因素。数值模拟结果表明,随着CO2浓度的增加,瓦斯突破时间延长,瓦斯产量先增加后降低。研究认为,温度和压力对气体吸附的综合影响是煤层气产能变化的结果。在浅埋煤层,压力是促进瓦斯吸附的主导因素,从而提高瓦斯含量和产量。然而,由于二氧化碳和甲烷(CH4)的竞争吸附,二氧化碳优先吸附在煤上,阻碍了解吸。因此,高CO2浓度CBG井的气侵速度较慢,但生产周期较长。相反,高温抑制煤层深层气体吸附,降低瓦斯含量,促进CH4解吸。因此,CO2浓度较低的CBG井天然气突破速度较快,但总体产量较低。研究结果有助于更好地了解富co2煤层气井的排水特征,为该类资源的开发提供指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Production characteristics and adsorption control mechanism of CO2-rich CBG wells.

To investigate the productivity laws of coalbed gas (CBG) wells in carbon dioxide (CO2)-rich coalfield, the Haishiwan coal mine in Yaojie coalfield, Gansu Province, China, which is rich in CO2 of different concentrations in CBG, was selected as the study area. Using numerical simulation technology, the production capacity of CBG wells was simulated, and the thermodynamic factors influencing gas adsorption differences on production capacity were discussed. Numerical simulation indicates that with the increase of CO2 concentration, the gas breakthrough time is prolonged, and the gas production first increases and then decreases. Research considers that changes in CBG production capacity result from the combined effects of temperature and pressure on gas adsorption. At shallow coal seams, pressure is the dominant factor that promotes gas adsorption, resulting in increased gas content and production. However, due to the competitive adsorption of CO2 and methane (CH4), CO2 preferentially adsorbs on coal, hindering desorption. Therefore, gas breakthrough in CBG wells with high CO2 concentration is slower, but the production period is longer. On the contrary, high temperatures inhibit gas adsorption in deeper coal seams, reducing gas content and promoting CH4 desorption. Therefore, CBG wells with low CO2 concentration have faster gas breakthroughs, but overall production is lower. The findings of this study help to better understand the drainage characteristics of CO2-rich CBG wells and provide guidance for developing such resources.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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