The effect of superplasticizers on rheological properties of cement slurries used during cementing of casing pipes in wellbores

摘要

Portland cement was mixed sep. with tap water or satd. NaCl brine in a 40:100 mass ratio and then one of the 3 com. plasticisers was added to each of the obtained slurries in an amt. of 0.6 (relative to the dry cement mass). Rotational viscometer with shear rate in the range of 1022-1.7 1/s and various rheol. models were used to def. the flow curves of slurries. The rheol. properties of the tested slurries were best described by Herschel-Bulkley model.