benchmarkwireline.com
P. O. BOX 850
Fax: 281.342.4848
Phone: 281.342.6415
Simonton,Texas 77476
36220 FM 1093
AM5K User Manual Rev Q Oct 2007 Page 4 of 44
2.0 SYSTEM DESCRIPTION
DEPTH MEASUREMENT:
The AM5K Measuring Head uses dual spring-loaded measuring wheels to measure the
amount of wireline moving to and from the borehole. The measuring wheels are
coupled to one or two optical encoders that transmit electrical signals via a cable to the
hoistman’s panel and/or logging computer. An independently powered magnetic
encoder is used for back up depth indication.
The hardened measuring wheels are 2.0000 ft. (.609600 m) in circumference. Springs
are used to hold the measuring wheels in contact with the wireline. The springs are
sized to provide the appropriate friction between the wheels and wireline. The frame
members are anodized 6061-T6 aluminum.
Under ideal conditions, without magnetic marks, the measuring heads have an accuracy
of +/- 3 m in 3000 m (10 ft in 10,000 ft.). With magnetic marks and accurate line stretch
calculations, an accuracy of .3 m in 3000 m (1 ft in 10,000 ft) can be achieved. The
Hoistman's panel is required to fully utilize the mark detection and stretch correction
algorithms.
TENSION MEASUREMENT:
The AM5K uses an electronic load axle to measure line tension. Three wheels are used
to create a force on the load axle. To generate this force the wheel mounted on the
load axle is offset from the other two slightly. This offset creates a slight bend in the
cable.
As wireline tension increases the small offset creates a corresponding bending force on
the strain-gauged load axle. An electronic signal is transmitted via cable to the
hoistman’s panel and/or logging computer representing wireline tension. A calibrate
resistor is included in the load pin to send out a signal to calibrate the computer system.
GENERAL SPECIFICATIONS:
WEIGHT: 58 lbs 26.3 kg
LENGTH: 26.5” 673 mm
HEIGHT: 10.8” 274 mm
WIDTH: 15.3” 389 mm
MAXIMUM TENSION: 20,000 lbs 9072 kg
MEASURING WHEEL SIZE: 24.000” 609.60 mm
CABLE SIZES: .190” to .494” 4.8 mm to 12.55mm
CABLE BEND OVER TENSION WHEEL: 2.5 – 7.5 degrees (depends on cable)
Minimal or no affects on magnetic marks
To Next Page
Loading...