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Rheological Models: Bingham, Power-law, Herschel-Bulkley

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Rheological Models: Bingham, Power-law, Herschel-Bulkley

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Questions and Answers

What does the presence of a yield stress in a fluid mean?

Flow can begin only after a critical shear stress is exceeded. (correct)

The fluid will always exhibit Newtonian flow.

The fluid behaves like a power-law fluid.

The fluid will have a linear shear stress versus shear rate relationship.

Which rheological model describes a fluid that requires a minimum pressure to initiate flow and is shear thinning?

Newtonian Fluid Model

Bingham Plastic Model (correct)

Power-law Model

Herschel-Bulkley Model

What kind of behavior is exhibited by most oil field fluids after flow initiation?

Shear rate dependence (correct)

Power-law behavior

Bingham Plastic behavior

Newtonian behavior

In the oil field, which model describes the flow behavior of clay-based drilling muds and few cement slurries?

Bingham Plastic Model Signup and view all the answers

What does PV represent in the context of drilling fluids?

Plastic viscosity Signup and view all the answers

What is the effect of high PV (plastic viscosity) on pump pressure requirements?

Increases pump pressure requirements Signup and view all the answers

In Herschel-Bulkley fluids, what follows the yield stress in terms of shear-rate/shear-stress relationship?

Power-law behavior Signup and view all the answers

What does a yield stress signify in Herschel-Bulkley fluids?

Flow can commence only after exceeding the yield stress. Signup and view all the answers

How does high YP (yield point) affect hole cleaning during cementing?

Improves hole cleaning efficiency Signup and view all the answers

What is an approximation for the effective viscosity at very high shear rates?

PV (Plastic Viscosity) Signup and view all the answers