| Rheology |
To achieve good hole
cleaning and fluid shear-thinning properties, maintain a PV:YP ratio
of 1:1 to 1:2. If additional viscosity is desired, use 0.75 lb/bbl
of polymer. Also 4-6 lb/bbl of pre-hydrated bentonite can be added
to supplement to viscosity but the viscosity will build as drilled
solids are incorporated into the system. Attention is focused on
effective solids control, polymer concentrations and proper additions
of KCl.
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