MANUAL – REFLEX EZ-TRAC™ | 74
11 Surveying methods
This chapter describes a number of different surveying methods for
REFLEX EZ-TRAC™. Instructions for assembling the corresponding
running gear are also provided.
Running gear for Orientation surveys is described in the chapter
Orientation Survey.
11.1 Running gear
Since REFLEX EZ-TRAC™ is a magnetic instrument, it has to be placed
at a distance from any magnetic interference, such as the drill string
or wireline. Aluminium extension rods are used for this purpose. The
total length may vary depending of type of drill string, but normally
4.5 m/15 ft of extension rods is enough.
Depending on surveying method, you may also need a pin spear
assembly, a landing collar box type, a core adapter or a swivel.
11.1.1 Important assembling tips
When assembling the running gear, please keep the following in
mind:
Only use sealing rings that have been provided by
REFLEX™
and ensure that they are correctly placed at all times.
Always keep sealing rings lubricated with a sufficient amount of
silicone grease, but not excessive amounts.
Always inspect the aluminium extension rods for tightness. Due
to the constant shock, they can sometimes slowly back off
coming loose, and possibly unscrewing down the hole.
Inspect the nylon landing sub for wear on a regular basis. This
can make the difference between the landing sub stopping or
passing right through the bit.
Ensure that the spring of the landing collar is facing in the
upwards direction. Otherwise it will not be able to absorb the
shock when the landing collar lands in the bit.
11.1.2 Maintenance
Before starting to assemble the running gear, check the condition of
all sealing rings. Clean, replace or lubricate if needed.
After the survey, clean and place all equipment back in the transport
case.
Please also refer to the chapter Maintenance.
11.1.3 Extension rods
Aluminium extension rods at a total length of 4.5 m/15 ft have to be
used at all times to avoid magnetic interference.
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