摘要：Methane is a high-quality and abundant clean energy source, known for its high calorific value, low pollution levels, and ease of transportation. To improve the efficiency of methane recovery from shale formations, we conducted a series of experiments to investigate the adsorption/desorption effects and mechanisms of a viscoelastic surfactant fracturing fluid system on shale methane. After treating shale with the VES fluid, the pore structure became more developed and pore space increased significantly. This promoted greater connectivity of microfractures and pore networks and increased the overall roughness of the shale surface. Compared to deionized water (DW) and hydroxypropyl guar (HPG) fracturing fluids, by means of electrostatic adsorption, the VES fluid also altered the surface charge characteristics of the shale, reducing the absolute value of the core's Zeta potential and transforming the shale surface from hydrophobic to hydrophilic. Furthermore, the VES fracturing fluid primarily affected micropores below 10 nm and narrow mesopores, resulting in a 29.9 % and 85.7 % decrease in nitrogen adsorption capacity. At temperatures of 55 degrees C and 70 degrees C, methane adsorption in VEStreated cores declined by 17.8 % and 17.0 %, respectively, compared to the original cores. Under identical equilibrium pressures, the VES-treated cores achieved rapid desorption, a phenomenon especially pronounced in the low-pressure range. Through the coupled effects of physical, chemical, mechanical, and interfacial adsorption mechanisms, the VES fluid modified the pore structure, wettability, and surface charge of the shale, enabling more methane to be released from micropores and fractures. This study elucidates the micro-scale mechanisms of VES fracturing fluids in shale reservoirs and clarifies their influence on methane adsorption and desorption behavior, providing theoretical guidance for the efficient development of unconventional shale gas reservoirs.

关键字：Viscoelastic surfactant fracturing fluid; Shale; Methane adsorption/desorption; Atomic force microscopy; Mechanistic study

ISSN号：1385-8947

卷、期、页：卷510

发表日期：2025-04-15

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：CHEMICAL ENGINEERING JOURNAL

参与作者：金哲辉

通讯作者：黄胜铭,常子伦,王全得

第一作者：蒋官澄,董腾飞,贺垠博,杨丽丽

论文类型：期刊论文

论文概要：黄胜铭,蒋官澄,常子伦,王全得,董腾飞,贺垠博,杨丽丽,金哲辉，The effect of viscoelastic surfactant fracturing fluid on methane adsorption/ desorption characteristics in Shale: Experimental and mechanistic study，CHEMICAL ENGINEERING JOURNAL，2025，卷510

论文题目：The effect of viscoelastic surfactant fracturing fluid on methane adsorption/ desorption characteristics in Shale: Experimental and mechanistic study