页岩储层注CO2置换CH4实验研究
Experimental Study on CH4 Replacement by CO2 Injection in Shale Reservoirs
DOI: 10.12677/me.2025.136131, PDF,    科研立项经费支持
作者: 吴 杰*, 吴绥靖, 赵 杰, 李孟龙, 李书奎：重庆科技大学石油与天然气工程学院，重庆；王 懿：中石化重庆页岩气有限公司，重庆
关键词: 页岩储层；柱状样品；等温吸附实验；注CO2置换工艺；Shale Reservoir； Columnar Sample； Isothermal Adsorption Experiment； CO2 Injection Replacement Process
摘要: 将CO2注入页岩储层中，能有效地提高页岩气的采收率，但是现有的研究多是针对不同气体组分的竞争吸附行为，缺乏CO2高压注入下置换效果的研究。因此开展柱状样品的CO2高压注入实验。研究结果表明：(1) 通过开展不同单组分气体的等温吸附实验，该实验样品对CO2的吸附能力强于CH4，在该区块使用注CO2置换工艺是可行的。(2) 在CO2注入后，由于存在CH4和CO2的竞争吸附，会导致样品室内压力的降低，吸附平衡前后压差越大，说明注CO2置换的效果也就越好。(3) 通过研究不同影响因素对CO2置换的影响，发现岩心渗透率、TOC含量和压裂液滞留量与ΔP值成正比。
Abstract: Injecting CO2 into shale reservoirs can effectively improve the recovery rate of shale gas. However, most existing studies focus on the competitive adsorption behavior of different gas components, and lack research on the replacement effect under high-pressure CO2 injection. Therefore, a high-pressure CO2 injection experiment was conducted on columnar samples. The results show that: (1) Through the isothermal adsorption experiments of different single-component gases, the adsorption capacity of the experimental sample for CO2 is stronger than that for CH4, and it is feasible to use the CO2 injection replacement process in this block. (2) After CO2 injection, the competitive adsorption of CH4 and CO2 will cause the pressure in the sample chamber to decrease. The greater the pressure difference before and after adsorption equilibrium, the better the effect of CO2 injection replacement. (3) By studying the influence of different influencing factors on CO2 replacement, it was found that the core permeability, TOC content and fracturing fluid retention are proportional to the value.
文章引用：吴杰, 吴绥靖, 赵杰, 李孟龙, 李书奎, 王懿. 页岩储层注CO2置换CH4实验研究[J]. 矿山工程, 2025, 13(6): 1166-1174. https://doi.org/10.12677/me.2025.136131

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