underground: directional drilling
Target’s state-of-the-art directional drilling equipment and highly skilled drill operators permits surface or in-mine boreholes to be placed in a predetermined path through the ground to the target area. This is accomplished by using a water powered downhole motor so that only the bit turns- not the drill string- to provide better and easier control of the bit direction. In addition, real time surveying instruments behind the bit provides continuous feedback to the operator as to where the bit is located and where it has been. This permits the operator to make any required corrections to the bit path to keep it on its planned trajectory.
In-Mine |
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Surface |
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In-Mine or surface drill provides bit weight or thrust conveyed through the drill string |
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Underground Drill Site |
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Surface Drill Site |
Fluid and Air Foam Powered Downhole Motors: |
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Downhole Motor Used to
Directionally Drill
Borehole Maintaining
Vertical and Horizontal
Trajectory Simultaneously
Powered by High
Pressure Water Pumped
Through Drill String or on
Surface Applications,
Powered by Fluid or Air
Foam |
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Downhole Motor |
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Downhole Motor 3 3/4 Inch |
Real-Time Cabled and EM Steering Systems: |
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6-Permissible DDM
MECCAs for In-Mine
EM Steering Systems
with focused gamma
used on surface while
drilling on fluid or air
foam |
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DDM Diagram |
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EM Steering System with Focused Gamma |
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Directional driller steers borehole using calculated survey elevation and coordinates provided by survey system computer
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Uphole Readout Unit |
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EM Operating Software |
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In most coal directional drilling applications, Target eliminates roof and floor rock intercepted by sidetracking
In CBM well applications all rock intercepted is eliminated by sidetracking maximizing gas recovery!
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