Effect of acid fracturing fluid modifying coal microstructure stimulated by ultrasonic

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING International Journal of Mining Science and Technology Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI:10.1016/j.ijmst.2025.01.005

Shaojie Zuo , Rui Gan , Zhijie Wen , Liang Zhang , Zhizhong Jiang , Fuping Zhao , Chengwei Liu , Kun Li , Zhiyuan Xu

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Abstract

The combination of ultrasonic and acid fracturing fluid can strengthen the modification effect on the micropore structure of the coal matrix, thereby enhancing the efficiency of the acid fracturing process. In this research, acetic acid was utilized to formulate acid fracturing fluids with varying concentrations, and the evolutionary traits of both the acid fracturing fluids and ultrasonic waves in relation to coal samples were investigated. The functional group structure, mineral composition, micropore structure and surface morphology of coal samples were characterized by FTIR, XRD, N₂ adsorption at low temperature and SEM-EDS. The results showed that aromatics (I) and branching parameters (CH₂/CH₃) were reduced by 81.58% and 88.67%, respectively, after 9% acetic acid treatment. Acetic acid can dissolve carbonates and clay minerals in coal, create new pores, and increase porosity, pore volume and pore fractal dimension. After modification by 7% acetic acid, the pore volume increased by 5.7 times. SEM observation shows that the diameter of coal surface holes increases, EDS scanning shows that the content of mineral elements in coal decreases, the connectivity of coal holes increases, and the holes expand. The findings of this research offer theoretical direction for optimizing ultrasonic-enhanced acid fracturing fluid modification.

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超声刺激下酸性压裂液对煤微观结构的影响

超声波与酸性压裂液的结合可以加强对煤基质微孔结构的改性作用，从而提高酸压工艺的效率。在本研究中，利用乙酸配制不同浓度的酸性压裂液，研究了酸性压裂液和超声波随煤样的演化特征。采用FTIR、XRD、N2低温吸附、SEM-EDS等表征了煤样的官能团结构、矿物组成、微孔结构和表面形貌。结果表明，经9%乙酸处理后，芳烃(I)和分支参数（CH2/CH3）分别降低了81.58%和88.67%。醋酸可以溶解煤中的碳酸盐和粘土矿物，形成新的孔隙，增加孔隙度、孔隙体积和孔隙分形维数。经7%醋酸改性后，孔隙体积增大5.7倍。SEM观察显示煤表面孔洞直径增大，EDS扫描显示煤中矿物元素含量降低，孔洞连通性增加，孔洞扩大。研究结果为优选超声强化酸性压裂液提供了理论指导。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.