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CONTENTS (Continued) <br />' Chanter paw <br /> 4 4 2 Cost Analysis 4-19 <br /> 45 VENDORS 4-19 <br />' <br /> 46 STRENGTHS AND LIMITATIONS 4-19 <br /> 47 RECOMMENDATIONS 4-20 <br /> 48 REFERENCES 4-21 <br />' 50 DIRECTIONAL DRILLING 5-1 <br /> 51 TECHNOLOGY OVERVIEW 5-1 <br /> 5 2 APPLICABILITY 5-3 <br /> 5 2 1 Geologic Conditions 5-4 <br /> 5 2 2 Distances Aclueved 5-4 <br /> 53 ENGINEERING DESCRIPTION 5-5 <br />' 53 1 Drill Rigs 5-5 <br /> 5 3 2 Drilling Assembly 5-6 <br /> 5 3 2 1 Tri-Cone Type Drilling Tools 5-7 <br /> 5 3 2 2 Hydraulically Assisted, Set-Style Drilling Tools 5-7 <br /> 5 3 2 3 Compaction Tools 5-7 <br /> 5 3 3 Drilling Fluids 5-7 <br /> 534 Guidance Systems 5-8 <br />' 5 3 5 Directionally Drilled Well Installation 5-9 <br /> 5 3 5 1 Well Materials 5-9 <br /> 5 3 5 2 Well Screens 5-9 <br /> 5 3 5 3 Well Casmgs 5-10 <br /> 5 3 5 4 Well Installation 5-10 <br />' 5 3 6 Design Considerations 5-10 <br /> 5 3 6 1 Radius of Curvature 5-11 <br /> 5 3 6 2 Air Flow Patterns 5-11 <br /> 5 3 7 Common Problems 5-12 <br />' <br /> 54 PERFORMANCE AND COST ANALYSIS 5-12 <br /> 5 4 1 Performance 5-13 <br /> • ni <br />