| Drill rod lowering or
insertion techniques are used where instrument retrieval is uncertain in
steep holes, or if gravity cable lowering is not possible.
The Tropari is capable of measuring azimuth and
inclination of the borehole at any angle or azimuth without any
modification.
In shallow or horizontal holes, the rod train will
sag mid-way between the connector and the end centralizer. With 4
"A" rods the maximum error is 1.8 degrees when the
rod/centralizer diameters are large enough to allow the full sag of
97mm. An additional centralizer mid-way in the train will limit this
error.
With drilling sizes larger than "H", we
recommend 5 non-magnetic rods in the survey train. |
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