Page 226 - Trenchless Technology Piping Installation and Inspection
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190 Cha pte r F i v e
Known corner locations
Surface coil
Steering tool
(probe)
Collector ring
Crossover sub
Steering tool Nonmagnetic
probe extension bar
Nonmagnetic
muleshoe sub
Mud
motor
Centralizers
Nonmagnetic Bent sub
drill collar
Flow thru Tricone
muleshoe stinger drill bit
FIGURE 5.5 Magnetic wireline survey. (Source: ASCE, 2005.)
FIGURE 5.6 Different types of reamers. (Source: Trenchless Engineering
Corporation.)
