Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 294, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2019.111643
Keywords
Natural methane hydrates; Drilling mud; 1-Methyl-3-octylimidazolium tetrafluoroborate; Rheology; Xanthan gum; Polyanionic cellulose
Funding
- Universiti Teknologi PETRONAS through FRGS Research grant from The Ministry of Higher Education, Malaysia [FRGS -0153AB-K77]
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Herein, 1-methyl-3-octylimidazolium tetrafluoroborate (OMIM-BF4) was tested as a potential additive to enhance the rheological and hydrate inhibition properties of polymer water-based muds (WBMs) for drilling natural gas hydrate sediments. API standards were adopted for the mud testing with and without OMIM-BF4, while the hydrate study was conducted using a high-pressure reactor at 8 MPa and -2 degrees C. The presence of OMIM-BF4 efficiently improved the rheological properties of the PAC and XGUM based muds by decreasing their flow behavior index by 4.97% and 47.77% and increasing their consistency index by 96.00% and 33.63%, respectively. The XGUM based mud system exhibited efficient rheological properties suitable for drilling hydrate reservoir compared with the PAC based mud system with and without OMIM-BF4. The Hershel-Bulkley model best predicted the rheological properties of all the mud systems by exhibiting less Mean Percentage Error (MPE) values in the range of 1.39% - 24.71%. Furthermore, the presence of OMIM-BE4 greatly inhibited methane hydrate formation in both PAC and XGUM water-based mud systems due to its kinetic inhibition efficiency mainly arising from its long alkyl chain hydrophobic adsorption activity on the hydrate crystals. (C) 2019 Elsevier B.V. All rights reserved.
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