Specifications

benchmarkwireline.com
P. O. BOX 850
Fax: [phone]
Phone: [phone]
Simonton,Texas 77476
36220 FM 1093
SHARK MANUAL Rev H Page 4 of 34 Aug 2009
2.0 TECHNICAL DESCRIPTION AND SPECIFICATIONS
2.1 WIRE PATH:
The wire runs from the well around the measure wheel (wheel nearest drum) then
around the tension wheel and back across the top of the measuring wheel onto the
drum. Even though the wire runs side by side across the top of the measure
wheel, the system is designed to prevent wire to wire rub. The tension wheel is
tilted slightly with respect to the measuring wheel so that the wire enters the wheel
on one side of the groove and exits the wheel on the opposite side of the groove.
Guide rollers are aligned to assist in keeping the wire on the proper side of the
groove.
The wire runs through a non reversed bend configuration (i.e. the wire is always
bent in the same direction). This minimizes wire fatigue due to bending the wire in
opposite directions each time it passes through the measuring head. The large
wheel radius minimizes the effects of fatigue and promotes longer wire life,
especially with larger diameter wirelines.
Guide rollers are installed on the tension wheel to keep the wire in the groove. A
spring mounted guide roller is used on the measure wheel to ensure the wire is
always pressed tightly against the measure wheel to prevent wire slippage at low
tension to minimize measurement error. The spring tightly presses the wire
against the wheel regardless of wire size. The spring force keeps the wire turning
the wheel even with sudden changes of direction during jarring action. A
composite guide roller is mounted above the measure wheel to keep the wire in the
groove when wireline tension is relaxed such as during transport and rigup.
2.2 DEPTH MEASUREMENT:
Depth measurement is made by wrapping the wire around the measuring wheel
which has a precision machined groove. The wheel groove has a circumference
of 4 feet with .125 wire installed. The wheel is hardened to greater than Rockwell
58 by using a special heat treat process. This minimizes wheel wear to maximize
wheel life.
This measuring head is capable of providing three completely independent depth
measurements, a mechanical counter, an optical encoder, and a magnetic
pickup.
The optical encoder provides a high resolution measurement to the BenchMark
hoistman’s panel. With this panel depth and line speed can be accurately
measured on different sized lines without changing wheels. This is done
electronically by the panel. Changes in wire size are accounted for by the panel
software. Wire stretch can also be automatically calculated by the panel. The