Drilling and Excavation Technologies for the Future -- Copyright -- PREFACE -- CONTENTS -- 1 EXECUTIVE SUMMARY -- RECOMMENDATIONS -- 2 ADVANCED DRILLING SYSTEMS -- INTRODUCTION -- THE DRILLING SYSTEM -- SMART DRILLING SYSTEMS AND THE SYSTEMS APPROACH -- REFERENCES -- 3 NATIONAL IMPORTANCE OF DRILLING -- INTRODUCTION -- OIL DRILLING -- NATURAL GAS DRILLING -- GEOTHERMAL DRILLING -- ENVIRONMENTAL DRILLING -- SERVICE COMPANIES -- INFRASTRUCTURE, UNDERGROUND EXCAVATION, AND MINING -- DRILLING FOR SCIENTIFIC PURPOSES -- SUMMARY AND RECOMMENDATIONS -- REFERENCES -- 4 DRILLING AND BORING OF ROCK -- INTRODUCTION -- TYPES OF ROCK -- THEORETICAL MODELS FOR THE BEHAVIOR OF ROCKS IN COMPRESSION -- EXPERIMENTAL VERIFICATION OF MODELS -- Two Views of Rock Behavior -- Laboratory Experiments on Clastic Flow and Fracture of Rocks -- Effect of Confining Pressure and Temperature on Strength -- Effect of Pore Fluid -- Effect of Size -- Evolution of Sources of Shear Faulting -- SURFACE-ACTIVE AGENTS IN ROCK FRACTURE -- FRACTURING OF ROCK IN DRILLING -- Phenomenology of Drill-Rock Interaction -- Theoretical "Plasticity" Models for the Faulting of Rocks -- Specific Models for Chip Formation -- Other Applications of Rock Fracture -- PRIORITIES FOR R&D -- REFERENCES -- 5 ROCK EXCAVATION TOOLS -- INTRODUCTION -- STATUS OF THE FIELD -- Novel Drilling Systems -- Combined Novel/Mechanical Systems -- Advanced Downhole Motors -- Advanced Drill Bits -- Advanced TBM Cutters -- High-Pressure Jet Drilling Systems -- Slim-Hole Drilling Tools -- Guided Percussion Drills -- Resonant Sonic Drills -- PRIORITIES FOR R&D -- REFERENCES -- 6 SENSING SYSTEMS -- INTRODUCTION -- STATUS OF THE FIELD -- Bit-Rock Interaction -- Formation Evaluation and Fracture Detection at and Ahead of the Bit -- Stress, Rock Strength, and Pore Pressure -- Drill Pipe-Rock Interaction.

Position and Direction Analysis -- Cuttings and Mud Analysis -- Environmental Logging -- Telemetry -- Data Analysis and Activation Systems -- PRIORITIES FOR R&D -- REFERENCES -- 7 DIRECTIONAL DRILLING AND TUNNELING -- INTRODUCTION -- DIRECTIONAL TUNNELING -- DIRECTIONAL DRILLING OF BOREHOLES -- Reasons for Directional Drilling -- Limitations to Borehole Reach and Turning Radius -- METHODS FOR DIRECTIONAL DRILLING -- Long-Radius Methods -- Medium-Radius Methods -- Short-Radius Methods -- Ultra-Short-Radius Methods -- Methods Using Coiled Tubing -- Directional Drilling in the Near Surface -- PRIORITIES FOR R&D -- References -- 8 BOREHOLE STABILITY -- INTRODUCTION -- PRIORITIES FOR R&D -- REFERENCES -- 9 MATERIALS HANDLING -- INTRODUCTION -- STATUS OF THE FIELD FOR DRILLING WELLS -- STATUS OF THE FIELD FOR MINING AND TUNNELING -- PRIORITIES FOR R&D -- REFERENCES -- 10 CONCLUSIONS -- APPENDIX A STATEMENT OF TASK -- ADVANCED DRILLING TECHNOLOGIES -- APPENDIX B Workshop Attendance.