Chapter 6

The Rheology of Drilling Fluids


The first part of this chapter discusses the theoretical flow behavior for the four mathematical flow models of interest in drilling fluid technology;

• Newtonian

• Bingham plastic

• Power law

• Yield power law

In this part no units are given for the flow equations because any set of consistent units will serve. Practical hydraulic equations for determining flow pressures and velocities in drilling wells are given in the second part of the chapter. Finally, some of the problems related to drilling fluid rheology, such as hole-cleaning, suspension, and swab and surge pressures, are discussed. Examples for calculating effective viscosities in the annulus flow regime are given as practical examples ...

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