Page 5 - Air and gas Drilling Field Guide 3rd Edition

vi Contents

3.4.4 Sample Catcher.................................................................. 55
3.4.5 Deduster............................................................................. 56
3.4.6 Gas Detector...................................................................... 56
3.4.7 Pilot Light........................................................................... 57
References ...........................................................................................57

CHAPTER 4 Downhole Equipment ...............................................59
4.1 Rotary Drill String ........................................................................59
4.1.1 Standard Drill String .......................................................... 59
4.1.2 Dual Wall Pipe Drill String................................................ 62
4.2 Drill Bits........................................................................................65
4.2.1 Drag Bits ............................................................................ 65
4.2.2 Roller Cutter Bits............................................................... 65
4.2.3 Air Hammer Bits ................................................................ 70
4.2.4 Classification of Drill Bits.................................................. 74
4.3 Bottom Hole Assembly.................................................................76
4.3.1 Drill Collars........................................................................ 77
4.3.2 Stabilizers and Reamers..................................................... 78
4.3.3 Downhole Surveying Equipment...................................... 81
4.4 Drill Pipe.......................................................................................83
4.4.1 Standard API Drill Pipe ..................................................... 83
4.4.2 Heavyweight Drill Pipe ..................................................... 84
4.5 Safety Equipment .........................................................................86
4.5.1 Float Valves ........................................................................ 87
4.5.2 Kelly Sub Valves................................................................. 89
4.6 Drill String Design........................................................................89
References ...........................................................................................92

CHAPTER 5 Compressors and Nitrogen Generators ......................93
5.1 Compressor Classification............................................................93
5.2 Standard Units ..............................................................................95
5.3 Continuous Flow (Dynamic) Compressors.................................97
5.3.1 Centrifugal Compressors................................................... 97
5.3.2 Axial-Flow Compressors.................................................... 99
5.4 Intermittent (Positive Displacement) Compressors..................100
5.4.1 Reciprocating Compressors ............................................ 100
5.4.2 Rotary Compressors ........................................................ 102
5.4.3 Summary of Positive Displacement Compressors.......... 108
5.5 Compressor Shaft Power Requirements....................................109
5.5.1 Basic Single-Stage Shaft Power Requirement ................. 109