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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/53B0C966-0A58-4E95-B3A5-357052FEA5F5 | - |
| Identifier | https://doi.org/10.2495/MPF070171 | - |
| Language | en | - |
| Title | Permeability, porosity and surface characteristics of filter cakes from water–bentonite suspensions | en |
| Creator | Kelesidis Vasilis | en |
| Creator | Κελεσιδης Βασιλειος | el |
| Creator | Tsamantaki C. | en |
| Creator | Pasadakis Nikolaos | en |
| Creator | Repouskou Eftychia | en |
| Creator | Ρεπουσκου Ευτυχια | el |
| Creator | Chamilaki Eleni | en |
| Creator | Χαμηλακη Ελενη | el |
| Content Summary | Water – bentonite suspensions behave as non-Newtonian fluids with exceptional rheological and filtration characteristics at low temperatures which deteriorate at temperatures higher than 120 0 C. Additives restore these characteristics but many of them are thermally unstable at the temperatures encountered for e.g. in oil-well and geothermal drilling. Greek lignite has been proven to be an excellent additive for water-bentonite suspensions at temperatures up to 177 0 C. In this work we attempt to assess the reason for such good performance by studying the surface characteristics and the permeabilities of filter cakes of water – bentonite suspensions with and without the additive (various lignite types) after exposing the samples to thermal static aging at 177 0 C for 16 hours. The filter cakes are produced with an American Petroleum Institute filter press allowing filtration for sufficient time to produce a filter cake with adequate thickness. The surface morphology of the filter cakes has been assessed with a scanning electron microscope. The permeabilities of the filter cakes were determined with an in-house technique which creates a 'wet core' of the filter cake of sufficient thickness and the water permeability is measured in a Hassler type meter. The differences between the reference samples (cakes from bentonite suspensions at room temperature) with cake samples from thermally aged water-bentonite suspensions and water–bentonite–lignite suspensions both in surface characteristics and in cake permeability are noted and discussed. | en |
| Type of Item | Πλήρης Δημοσίευση σε Συνέδριο | el |
| Type of Item | Conference Full Paper | en |
| License | http://creativecommons.org/licenses/by-nc-nd/4.0/ | en |
| Date of Item | 2015-11-12 | - |
| Date of Publication | 2007 | - |
| Bibliographic Citation | V.C. Kelessidis, C. Tsamantaki, N. Pasadakis, E. Repouskou, E. Hamilaki, "Permeability, porosity and surface characteristics of filter cakes from water-bentonite suspensions," in 2007 6th International Conference on Advances in Fluid Mechanics, pp. 173-182, doi: 10.2495/MPF070171 | en |
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