1. Adsorption of imidazolium-based ionic liquid on sodium bentonite and its effects on rheological and swelling behaviors.
- Author
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Ren, Yanjun, Wang, Haonan, Ren, Zechen, Zhang, Ying, Geng, Yiran, Wu, Liansong, and Pu, Xiaolin
- Subjects
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LIQUID sodium , *SWELLING of materials , *BENTONITE , *SHALE oils , *IONIC liquids , *FOURIER transform infrared spectroscopy , *DRILLING fluids - Abstract
Clay is closely associated with the drilling of oil and gas by influencing the shale wellbore stability and the rheology of drilling fluids. In this work, four imidazolium-based ionic liquids (ILs) were used to modify the typical clay (i.e., sodium bentonite (Na-Bent)), and their effects on the Na-Bent rheological and swelling properties were evaluated by shear rheological measurements, immersion experiment, linear swelling measurements. The mechanisms involved were identified by using fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Zeta-potential and environmental scanning electron microscopy (ESEM) analysis. Evaluation experiment results showed that the adsorption of each IL could both significantly affect the Na-Bent rheological property and inhibit the Na-Bent swelling, which strongly depended on ILs' structures and concentrations. The mechanism study revealed that the cationic groups of ILs could adsorb on Na-Bent prior to water molecules, followed by expelling water and compressing the double electrode layers, and therefore inhibit the Na-Bent swelling. The adsorption of ILs could also change aggregation behaviors of the Na-Bent particles, by which the "house of cards" structures in Na-Bent dispersions were improved or destroyed, resulting in changes in rheological properties of Na-Bent dispersions. Unlabelled Image • An ionic liquid (IL) can affect the clay rheological and swelling behaviors • Effects of IL on clay depend on IL's structure and concentration • Preferential adsorption of IL expels water and compresses double electrode layers • IL inhibits clay swelling by minimizing crystalline and osmotic hydration of clay • Changes of "house of card" structure account for the clay rheological transitions [ABSTRACT FROM AUTHOR]
- Published
- 2019
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