On the end-effect correction for Couette type oil-field direct-indicating viscometers for Newtonian and non-Newtonian fluids

V. C. Kelessidis, R. Maglione, G. Bandelis

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Analysis and experimental results are presented which quantify the magnitude of end-effects for direct-indicating, narrow gap, rotating cylinder viscometers used extensively in oil-field, for Newtonian and non-Newtonian fluids. Such viscometers have already embedded at manufacturing stage an end-effect correction and give directly the shear stress which does not allow end-effect quantification in a straight forward manner. The presented analysis resolves this problem by estimating the embedded correction, which has been determined as 6.69% of the torque developed along the cylindrical part of the stationary bob of this viscometer. Experimental results with Newtonian and non-Newtonian fluids show that there is no additional end-effect from the bottom of the stationary bob. However, there is additional end-effect contribution from the top section of the bob, which has not been taken into account in the design and manufacturing of the instrument. Its magnitude ranges from 5 to 6% for the Newtonian fluid and the high shear rate range for the non-Newtonian fluid, to 12% for the low shear rate range for the non-Newtonian fluid tested, while the impact on drilling situations is also discussed.

Original languageEnglish
Pages (from-to)37-46
Number of pages10
JournalJournal of Petroleum Science and Engineering
Volume71
Issue number1-2
DOIs
Publication statusPublished - Mar 2010
Externally publishedYes

Fingerprint

non-Newtonian fluid
Viscometers
Oil fields
oil field
Fluids
Shear deformation
manufacturing
Newtonian fluid
torque
shear stress
Shear stress
Drilling
Torque
drilling
effect

Keywords

  • Couette viscometer
  • end-effects
  • Newtonian
  • non-Newtonian

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Fuel Technology

Cite this

On the end-effect correction for Couette type oil-field direct-indicating viscometers for Newtonian and non-Newtonian fluids. / Kelessidis, V. C.; Maglione, R.; Bandelis, G.

In: Journal of Petroleum Science and Engineering, Vol. 71, No. 1-2, 03.2010, p. 37-46.

Research output: Contribution to journalArticle

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