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A novel water-soluble copolymer was prepared from acrylamide (AM), acrylic acid (AA), mono-2-O-(allyloxy-2-hydroxyl-propyl)-β-cyclodextrin (O-β-CD) and allyl alcohol polyoxyethylene ether (APEG), which was characterized with infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, 13C-nuclear magnetic resonance spectrometry and static light scattering. This new copolymer combining polyglycols and the massive hydroxyl groups and cavity structure of β-CD was investigated for inhibiting shale hydration. Based on the salt-tolerance test, thermogravimetric-differential scanning calorimetry-mass spectrometer analyses, copolymer AM/AA/APEG/O-β-CD has made progress in the salt and temperature resistances. Moreover, the remarkable inhibiting-hydration performance of copolymer was found as evidenced by the reduction of interlayer spacing of sodium montmorillonite and the high retention rates of indentation hardness of shale cores.
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Jiang et al. (2015) studied this question.
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