Chapter 1

Introduction to Drilling Fluids

Abstract

This chapter is a general introduction to the composition, functions, properties, and systems used to drill oil and gas wells. A description of the various levels of expertise, as defined by the API for a drilling fluid specialist are covered. The reasons for using a drilling fluid are given in the functions section, the two main properties to satisfy the functions being density to control pressures and viscosity for hole cleaning and suspension. The composition of drilling fluids is related to the base fluid used to formulate the fluid—water, nonaqueous, or pneumatic. The properties of the fluid, as tested by the drilling fluid specialist, are described. The properties tested are classified as ...

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