注CO2提高页岩吸附甲烷采收率核磁共振实验

doi:10.3969/j.issn.1006-6535.2023.05.015

摘要/Abstract

摘要： 明确CO₂作用下页岩对CH₄的吸附解吸规律,对提高页岩气采收率具有重要意义。在明确目标页岩孔隙结构的基础上,引入核磁共振测试技术,分别开展了注CH₄和注CO₂吸附解吸实验,定量表征了CH₄的绝对吸附量,并研究了CO₂对页岩中CH₄吸附解吸的影响规律。结果表明:页岩中的CH₄以页岩表面的吸附态、孔隙中的游离态和颗粒之间的自由态赋存;核磁共振法计算的CH₄绝对吸附量大于热重法测定的过剩吸附量;CO₂能够解吸摩尔分数为21.8%~33.2%的吸附态CH₄;吸附态CH₄解吸后会滞留在孔隙中成为游离态,但无法从孔隙中逸出成为自由态;注CO₂提高吸附气采收率的同时还应辅以二次水力压裂或CO₂干法压裂技术,以提高游离态CH₄向自由态的转化效率。研究成果可为提高页岩吸附CH₄采收率提供参考和借鉴。

关键词: 页岩, CO₂, 吸附解吸, 吸附CH₄, 核磁共振

Abstract: It is very important to clarify the adsorption-desorption law of shale-adsorbed CH₄ under the action of CO₂ to improve the recovery of shale gas. On the basis of clarifying the pore structure of the target shale, the nuclear magnetic resonance (NMR) testing technique was introduced, the CH₄ injection and CO₂ injection adsorption-desorption experiments were carried out separately to quantitatively characterize the absolute adsorption amount of CH₄, and the influence law of CO₂ on the adsorption-desorption of CH₄ in shale was investigated. The results show that CH₄ in shale occurs in three states: adsorbed state on the shale surface, unbound state in pores and free state between particles; the absolute adsorption amount of CH₄ calculated by NMR is greater than the excess adsorption amount determined by thermogravimetry; CO₂ can desorb the adsorbed CH₄ with molar fraction of 21.8%~33.2%; the adsorbed CH₄ will remain in the pores as unbound state after desorption, but cannot escape from the pore space as free state; while CO₂ is injected to improve the recovery of adsorbed gas, the secondary hydraulic fracturing or CO₂ dry fracturing technology shall be adopted to improve the conversion efficiency of unbound state CH₄ to free state. The research results can provide reference for improving the recovery of shale-adsorbed CH₄.

Key words: shale, CO₂, adsorption-desorption, adsorbed CH₄, nuclear magnetic resonance

中图分类号:

TE348

张添锦, 王延峰, 李军, 袁青. 注CO₂提高页岩吸附甲烷采收率核磁共振实验[J]. 特种油气藏, 2023, 30(5): 113-120.

Zhang Tianjin, Wang Yanfeng, Li Jun, Yuan Qing. Nuclear Magnetic Resonance Experiment for Enhanced Recovery of Adsorbed Methane from Shale through Carbon Dioxide Injection[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 113-120.

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注CO₂提高页岩吸附甲烷采收率核磁共振实验

Nuclear Magnetic Resonance Experiment for Enhanced Recovery of Adsorbed Methane from Shale through Carbon Dioxide Injection

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