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Vassilios C. Kelessidis, Vasiliki Hatzistamou, Roberto Maglione
Wall slip phenomenon assessment of yield stress pseudoplastic fluids in Couette geometry
Appl. Rheol. 20:5 (2010) 52656 (8 pages)
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Results are presented aiming to determine whether wall slip occurs while performing rheological measurements of Carbopol
solutions and bentonite dispersions at different concentrations using a standard oil-field Couette-type viscometer with two
gap sizes. Yield stresses using a vane rheometer were also determined and compared to those obtained by extension of the
experimentally-derived rheological curves at the Couette viscometer.The results show that, if preparation procedures are followed
as suggested for Carbopol solutions and by API standard for drilling fluids, simulating either the pre-shearing in the
rig mud pumps or in the bit nozzles during drilling operations, wall slip does not occur, with a good agreement of the
rheograms and of the yield stresses determined for both gap sizes of the Couette viscometer and by the vane rheometer. No
slip occurs also for CMC solutions which exhibited pseudoplastic power-law behavior.
► Cite this publication as follows:
Kelessidis VC, Hatzistamou V, Maglione R: Wall slip phenomenon assessment of yield stress pseudoplastic fluids in Couette geometry, Appl. Rheol. 20 (2010) 52656.
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