Report No. FHWA-RD.

1817 LIBRARIES accuracy angle borehole buckling coefficient of friction core barrel guidance core-barrel cost savings Critical Length device diamond wireline core direction changes directional drilling Down-Hole Motor Drilling down-hole thruster drill bit Drill Hole drill pipe drill string weight drilling fluid drilling mud drilling operation drilling rigs drilling techniques Drilling Thrust Dyna-Drill Dynamic Friction estimates feet Figure Friction Coefficient Guidance Package gyroscopic survey tool Hole Length 1000 Hole Length km Hole Stabilization hole wall HORIZONTAL DRILLING SYSTEM horizontal holes hydraulic in-hole inches Length 1000 ft locking cell maximum MICHIGAN penetration capability potential pressure procedures reaction torque real time survey Required to Drill rolling cutter bits rolling cutter coring rotary drilling rotating Spin-Up state-of-the-art Static Friction Static Friction Coefficient Surface Drilling surface rig Table Task B development telemetry thrust cell Thrust Required thrust unit Torque Required Transfer Tube wireline core drilling wireline survey tool