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Issue 3, 2015
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Water-soluble complexes of an acrylamide copolymer and ionic liquids for inhibiting shale hydration

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Abstract

Here, we report water-soluble complexes of an acrylamide copolymer and ionic liquids for inhibiting shale hydration. The copolymer, denoted as PAAT, was synthesised via copolymerisation of acrylamide (AM), acrylic acid (AA) and N,N-diallyl-4-methylbenzenesulfonamide (TCDAP), and the ionic liquids used were 3-methyl imidazoliumcation-based tetrafluoroborates. X-ray diffraction showed that compared with commonly used KCl, the water-soluble complex of PAAT with 2 wt% ionic liquid 1-methyl-3-H-imidazolium tetrafluoroborate (HmimBF4) could remarkably reduce the d-spacing of sodium montmorillonite in water from 19.24 to 13.16 Å and effectively inhibit clay swelling. It was also found that the PAAT–HmimBF4 complex with 2 wt% HmimBF4 could retain 75% of the shale indentation hardness and increase the anti-swelling ratio to 85%. 13C NMR revealed that there existed interactions between PAAT and HmimBF4. Moreover, the thermal stability of the PAAT–HmimBF4 complex is superior to PAAT, suggesting that this water-soluble complex can be used to inhibit clay and shale hydration in high-temperature oil and gas wells.

Graphical abstract: Water-soluble complexes of an acrylamide copolymer and ionic liquids for inhibiting shale hydration

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Supplementary files

Article information


Submitted
06 Oct 2014
Accepted
06 Jan 2015
First published
07 Jan 2015

New J. Chem., 2015,39, 2155-2161
Article type
Paper
Author version available

Water-soluble complexes of an acrylamide copolymer and ionic liquids for inhibiting shale hydration

S. Gou, T. Yin, K. Liu and Q. Guo, New J. Chem., 2015, 39, 2155
DOI: 10.1039/C4NJ01741B

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