MANUAL – REFLEX EZ-TRAC™ | 75
Figure 89 Aluminium extension rods
Assemble extension rods
1. 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.
2. Initiate the instrument using the REFLEX™ EZ-COM unit before the
top coupling is threaded onto the instrument probe.
3. Thread the pin end of the aluminium extension rod into the top
coupling of the instrument.
11.1.4 Landing collars
Landing collars are needed when the survey system is run down the
drill string and through the drill bit, to prevent the system from passing
out of the drill string completely.
Some operators use a landing collar with pin spear head, which is
latched to the overshot assembly. Some operators prefer to thread
the landing collar to the overshot assembly, using a box type of
landing collar.
Figure 90 Pin spear landing collar assembly
Pin spear landing collar assembly
1. Thread the pin spear landing collar assembly into the box end of
the aluminium extension rod and tighten with pipe wrenches.
2. Latch the pin spear onto the overshot assembly.
Figure 91 Pin spear coupling and landing collar
Pin spear coupling and landing collar
1. Thread the spring end of the landing collar into the pin spear
coupling. Note, it is important that the spring is facing in the
upwards direction.
2. Thread the landing collar assembly into the box end of the
aluminium extension rod and tighten with pipe wrenches.
3. Latch the pin spear onto the overshot assembly.
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.
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