MANUAL – REFLEX EZ-TRAC™ | 82
3. Thread a push rod into the survey system.
4. Continue to add rods until the survey station is reached.
5. Keep the survey system stationary at the survey station until the
measurement has been taken.
6. Pull the rods from the hole until the survey system has reached
the collar of the hole.
7. Gently lift the survey system from the hole.
8. Place the survey system in a safe position away from the
borehole and unthread the running gear.
11.2.6 Reverse Circulation
This surveying method is used in Reverse Circulation drilling only.
Since the survey system cannot pass the drill bit, the survey has to be
performed inside the RC drill rods. Inclination measurements can
always be performed, as these are not affected by magnetism.
However, if azimuth readings are required, a minimum of nine meters
of non-magnetic rods directly behind the RC hammer must be
included. The instrument also has to be placed in the middle of these
non-magnetic drill rods.
11.2.6.1 Azimuth and inclination
This method is used to achieve Single Shot or Multi Shot readings of
azimuth and inclination in an RC environment.
Wireline is used to run the survey system into and out of the
borehole, with the instrument placed in the middle of in total nine
meters of non-magnetic aluminium extension rods.
The survey system consists of the
REFLEX EZ-TRAC™ instrument, six
aluminium extension rods, an orientation bull plug and a brass
wireline swivel.
In addition to that, nine meters of non-magnetic RC drill rods are
required. These shall be placed directly behind the RC hammer to
prevent magnetic interference.
Assemble survey system
1. Remove the bottom nose from the REFLEX EZ-TRAC™.
2. Thread the orientation bull plug onto the lower end of the
instrument.
3. Using open end wrenches, join the three aluminium extension
rods together. Use the machined slots to position the wrenches.
The total assembled length should be 4.5 m/15 feet.
4. Thread the box end of the aluminium extension rods into the
orientation bull plug.
5. Initiate the instrument using the
REFLEX™ EZ-COM unit before the
top coupling is threaded onto the instrument probe.
6. Join another three aluminium extension rods together (see step 5
above).
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