BenchMark Wireline AM5K Series - 3.4 CHANGING CONFIGURATION BETWEEN OPEN HOLE AND CASED HOLE

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AM5K User Manual Rev Q Oct 2007 Page 9 of 44
3.4 CHANGING CONFIGURATION BETWEEN OPEN HOLE AND CASED
HOLE
A measuring head configured for open hole will typically contain a magnetic mark
detector and a 2
nd
encoder. Cased hole operations rarely require a magnetic
mark detector and typically use only one encoder.
If the head is configured for open hole, no changes are required to run it on a
cased hole unit. You may elect to remove the magnetic mark detector if you
have no plans to use the head on an open hole unit any time in the near future.
The cased hole head can be configured with a different wear plate. The cased
hole wear plate is thicker and stepped on one end to the keep the line from riding
near the top of the wheels. This can occur when going in the hole with a small
cable (7/32") with a very light load. The open hole wear plate is flat. Both plates
are made from hardened tool steel. The wear plate is mounted on the upper
frame above the measure wheels.
Part number for the open hole wear plate is: AM5KM034
Part number for the cased hole wear plate is: AM5KM074
3.4.1 To remove the magnetic mark detector, refer to item 12 of drawing 6.2.
Remove the four screws holding the detector in place then remove the
detector. To install a magnetic mark detector, reverse this procedure.
3.4.2 To remove an encoder, remove the four screws securing the encoder
adapter to the head. Remove the encoder and adapter. Remove the
coupling from the measuring wheel shaft.
3.5 INSTALLING THE DEEP GROOVED TENSION WHEEL
3.5.1 A Deep Groove High Load tension wheel is available for use when line
tension greater than 12,000 lbs is commonly encountered. This wheel has
a deeper groove to better support the wireline at high tensions. The deep
groove also reduces the radius of the wheel which lowers the bend angle
of the wireline.
This wheel is only for use with .472 Slammer or .494 Super Slammer
cables and cannot be used with smaller cable sizes. For cables larger
than .472, the severe load tension wheel should be used.
The normal wheel can be used at high loads for short pull durations but
should not be used when loads exceed 12,000 lbs for an extended period
of time.