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The purpose of this part of the Manual is to introduce the geoscientist to wellsite equipment and evaluation procedures that will be encountered while on location. The first half of Part 3 focuses on equipment and fundamental drilling operations, while the second half focuses on wellsite formation evaluation and acquisition of geological data.

Part 3, Wellsite Methods, begins with a discussion by Arnold Woods and Byram Reed of factors that must be considered when planning to drill a well. Reed also provides overviews of onshore and offshore rigs and rig personnel. Elmo Eltzroth then describes some of the safety considerations peculiar to drilling operations. This is followed by a chapter on methods for establishing wellbore trajectory (vertical, deviated, and horizontal) by Curtis Cheatham and a chapter on drilling fluid systems by David Young. Parke Dickey discusses the problems associated with drilling in over- and underpressure conditions, and Arnold Woods covers commonly used fishing tools and procedures. A chapter on other common drilling problems is given by Phyllis Loose.

The second half of Part 3 begins with a chapter on measurement while drilling (MWD) techniques by Mike Medeiros, followed by Scott Boone's chapter on the use of rate of penetration (ROP) as an evaluation tool. Wellsite math used in various on-site calculations is outlined and explained by Greg Dunn. Mudlogging is then covered by several papers: a description of the equipment, services, and personnel, as well as the mudlog itself, by Alun Whittaker; drill cuttings analysis by Whittaker and Diana Morton-Thompson;

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