Permeability, porosity and surface characteristics of filter cakes from water-bentonite suspensions

V. C. Kelessidis, C. Tsamantaki, N. Pasadakis, E. Repouskou, E. Hamilaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

Water-bentonite suspensions behave as non-Newtonian fluids with exceptional rheological and filtration characteristics at low temperatures which deteriorate at temperatures higher than 120°C. Additives restore these characteristics but many of them are thermally unstable at the temperatures encountered, for example 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°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°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.

Original languageEnglish
Title of host publicationComputational Methods in Multiphase Flow IV
Pages173-182
Number of pages10
Volume56
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event4th International Conference on Computational and Experimental Methods in Multiphase and Complex Flow 2007 - Bologna, Italy
Duration: 12 Jun 200714 Jun 2007

Other

Other4th International Conference on Computational and Experimental Methods in Multiphase and Complex Flow 2007
CountryItaly
CityBologna
Period12/6/0714/6/07

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Keywords

  • Bentonite
  • Filter-cake
  • High-temperature
  • Lignite
  • Permeability

ASJC Scopus subject areas

  • Mathematics(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this

Kelessidis, V. C., Tsamantaki, C., Pasadakis, N., Repouskou, E., & Hamilaki, E. (2007). Permeability, porosity and surface characteristics of filter cakes from water-bentonite suspensions. In Computational Methods in Multiphase Flow IV (Vol. 56, pp. 173-182) https://doi.org/10.2495/MPF070171