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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
EN
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EL
| URI | http://purl.tuc.gr/dl/dias/E6ECD3D7-A868-48FF-9F85-5CCA77AD856A | - |
| Identifier | https://doi.org/10.1016/j.petrol.2010.01.001 | - |
| Language | en | - |
| Extent | 9 | en |
| Title | On the end-effect correction for Couette type oil-field direct-indicating viscometers for Newtonian and non-Newtonian fluids | en |
| Creator | Kelesidis Vasilis | en |
| Creator | Κελεσιδης Βασιλειος | el |
| Creator | Maglione R. | en |
| Creator | Bandelis G. | en |
| Publisher | Elsevier | en |
| Description | Δημοσίευση σε επιστημονικό περιοδικό | el |
| Content Summary | 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. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-10-29 | - |
| Date of Publication | 2010 | - |
| Subject | end-effects | en |
| Subject | Newtonian | en |
| Subject | non-Newtonian | en |
| Subject | Couette viscometer | en |
| Bibliographic Citation | V.C. Kelessidis, R. Maglione, G. Bandelis," On the end-effect correction for Couette type oil-field direct-indicating viscometers for Newtonian and non-Newtonian fluids," Journal of Petroleum Science and Engineering, vol. 71, no. 1-2, pp. 37–46, Mar. 2010. doi: 10.1016/j.petrol.2010.01.001 | en |
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