高岭石
碳氢化合物
煤
吸附
化学工程
肺表面活性物质
水力压裂
混合(物理)
多孔性
化学
石油工程
材料科学
矿物学
地质学
复合材料
有机化学
物理
量子力学
工程类
作者
Mengmeng Yang,Junyue Zhang,Liang Zhang,Shihui Gong
出处
期刊:ACS omega
[American Chemical Society]
日期:2024-04-16
卷期号:9 (17): 19418-19427
被引量:1
标识
DOI:10.1021/acsomega.4c00692
摘要
Clean fracturing fluids are environmentally friendly and could have broad applications in permeability enhancement of coal seams. The hydrophobic chain length of the viscoelastic surfactant (VES) and the mixing of VESs with different ionic types have marked effects on the performance of clean fracturing fluids. This paper analyzes the effects of the hydrocarbon chain length of VES and mixing of VESs with different ion types on the pores of coal and discusses the mechanisms controlling the pore changes from a physical and chemical perspective. We found that the coal samples treated with clean fracturing fluid B had the largest porosity change. Adding two methylene groups to the hydrocarbon chain of the cationic VES will increase clay swelling in coal treated with fracturing fluids. Adding 0.1 wt % cocoamidopropyl betaine (zwitterionic VES) to cationic VES fracturing fluids can reduce the extent of clay expansion induced by fracturing fluids. VES with a long hydrocarbon chain has a strong ability to remove kaolinite in hard coal, and the addition of zwitterion VES increases the ability of a clean fracturing fluid to remove kaolinite. These results provide theoretical guidance for the synthesis of new VES molecules and the design of new fracturing fluid formulations.
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