A phase inversion polymer coating to prevent swelling and spalling of clay fines in coal seam gas wells
Article
Article Title | A phase inversion polymer coating to prevent swelling and spalling of clay fines in coal seam gas wells |
---|---|
ERA Journal ID | 210637 |
Article Category | Article |
Authors | Ge, Lei (Author), Hamilton, Christopher (Author), Febrina, Rahman Tasha (Author), Rudolph, Victor (Author) and Rufford, Thomas E. (Author) |
Journal Title | International Journal of Coal Science and Technology |
Journal Citation | 5 (2), pp. 179-190 |
Number of Pages | 12 |
Year | 2018 |
Place of Publication | China |
ISSN | 2095-8293 |
2198-7823 | |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s40789-018-0199-0 |
Web Address (URL) | https://link.springer.com/article/10.1007/s40789-018-0199-0 |
Abstract | We report a phase inversion polymer coating as a novel concept with potential to prevent clay swelling and fines generation in coal seam gas, or other petroleum, wellbores. Our approach uses polyethersulfone (PES) with N-methyl-2-pyrrolidinone (NMP) as a water-soluble solvent to form a dense, low-porosity film across the clay-rich interburden layers, but a porous and permeable membrane on coal seams. This contrasting behaviour occurs because the coal contains much more free water than the clay-rich interburden layers. We demonstrate the efficacy of the method to prevent clay spalling in immersion tests and under a flow of fresh water in a visual swell test apparatus. The clay-rich rocks studied were mudstone and siltstone, and these were dip coated in the PES/NMP solution. The uncoated mudstone swelled and broke apart quickly in the immersion test and visual flow test, but the PES coated rock samples were stable for 30 days. The coated rock and coal samples were characterised by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. The morphology of coated mudstone and coated coal samples showed that the polymer formed a dense layer across the low-permeability mudstone, but an open porous structure on the coal surface. The effect of the coating on the permeability of KCl brine through coal was measured in a core-flood apparatus. Although the permeability of the coal showed some deterioration after coating, from (0.58±0.12) mD to (0.3±0.03) mD, these results demonstrate the potential of a smart polymer coating to prevent clay swelling while remaining permeable to gas and water on coal layers. |
Keywords | phase inversion polymer coating; coal seam gas, clay swelling |
ANZSRC Field of Research 2020 | 340305. Physical properties of materials |
401907. Petroleum and reservoir engineering | |
400409. Separation technologies | |
Byline Affiliations | University of Queensland |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) Grant ID LP160101531 |
https://research.usq.edu.au/item/q4q02/a-phase-inversion-polymer-coating-to-prevent-swelling-and-spalling-of-clay-fines-in-coal-seam-gas-wells
Download files
Published Version
Ge2018_Article_APhaseInversionPolymerCoatingT.pdf | ||
License: CC BY 4.0 | ||
File access level: Anyone |
1145
total views203
total downloads0
views this month0
downloads this month