3 ARM CALIPER

3 ARM TECHNICAL SPECIFICATIONS

System Requirement GAA Logger 20
Diameter 32 mm
Length 2 m
Weight 15 kg
Max. pressure 200 bars =2900 psi
Max. temp. 70º C
Power supply 35-40v
Caliper: range 40 - 380 mm
Logging speeds 8 m/min

APPLICATIONS

The three arm caliper logs measure the average diameter of drilled holes by use of three arms which are mechanically linked to a precision
potentiometer. Logs are presented as a single trace that displays the diameter of the well in either inches
or mm.
When run with an electric or nuclear log, the caliper is very useful as an interpretive aid in substantiating
the differences in log readouts that result from well diameter effects rather than from lithologic changes.
Most logs that respond to lithologic changes are also affected by changes in hole diameter, so diameter is important to correct for this.
Caliper calculations can be used for volume and annular computations for cementation of wells etc.
Calipers can also be important for diameter reckoning for packer setting and cement baskets etc.