Page 3 - Drilling a Straight Hole

Figures v Contents

Tables viii
Petroleum Extension-The University of Texas at Austin
Foreword ix
Preface xi ▼
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Acknowledgments xii
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About the Author xiii
Units of Measurement xiv
Introduction 1
Development of Wellbore Survey Tools 3
Contract Deviation Clauses 7
To Summarize 10
Straight Hole Considerations 11
Restricted Total Hole Angle 13
Restricted Rate of Hole-Angle Change 15
Doglegs and Keyseats 15
Drill Pipe Failure 17
Stuck Drill Pipe, Logging Tools, and Wireline 20
Stuck, Damaged, or Worn Production Casing 20
Sub-Optimal Cement Circulation 20
Production Problems 20
To Summarize 21
Factors Affecting Hole Deviation 23
Formation Effects 23
Formation Dip 24
Variation in Drillability of Formations 25
Mechanical Effects 26
To Summarize 31

Methods of Controlling Hole Deviation 33
Start Straight 35
Use the Right Bottomhole Assembly 37
Pendulum Assembly 38
Packed-Hole Assembly 44
Design Factors 46
Packed-Hole Assemblies for Various Conditions 50
Packed Pendulum Assembly 55
Downhole Mud-Motor Assemblies 56
Drilling Parameters 59
To Summarize 59
Drill Stem Tools 61
Standard Drill Collars 61
Drill Collar Size and Weight 61
Drill Collar Selection 66
Heavy-Walled and Heavyweight Drill Pipe 70

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