drilling fluid

Rheological Behavior of Drilling Fluids Containing Hydrophobically Modified Starch for Filtrate Reduction

In this work, stress-strain graphs of inverse emulsion fluids containing hydrophobically modified starch were plotted from measurements obtained with a coaxial rotating cylinder viscometer, and rheological models were applied. The Bingham model best fitted the experimental results. The correlations obtained by this model allowed calculating plastic viscosity values outside the shear rate sensitivity range of the viscometer and enabled better determination of the conditions for the fluid use.

Study on the Application of Starch Derivatives as the Regulators of Potassium Drilling Fluids Filtration

Derivatives of starch, such as graft copolymer of acrylamide onto starch, carbamoylethylated starch, carbamoylethyl-dihydroxypropylated starch, and dihydroxypropylated starch have been tested for their properties as components of drilling fluids used for clay inhibition and for the regulation of their rheology. The influence of modified starch and their blends with tylose as protective agents in the filtration of drilling fluids, as well as replacement of tylose, by modified starch were investigated.