Drawworks Brake Application0 pages

Offshore Oil Rig
Drawworks Brake Solution
Positorq LCB (Load Control Brake)
The “All in One” Positorq LCB (Load Control brake)
Force Control Industries, Inc. provides an ideal solution to solve problems
associated with many current drawworks including the friction brake and
the auxiliary brake. Using the Positorq LCD (load control brake) with Oil
Shear Technology puts all of the control in one simple to operate, highly
reliable brake package.
The Positorq LCB is a multiple disc, oil shear, hydroviscous brake designed
for continuous slip as well as dynamic stopping and static holding, all in
one system.

What is a Positorq LCB?
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A high performance multipurpose bio-degradable traction lubricant circulates
through a closed loop system that is continually filtered and temperature
controlled. Cooling of this fluid can be accomplished either through “oil to
air” or “oil to water” heat exchangers. All internal working parts of the brake
are operating in clean lubricating fluid and not exposed to salt air or water.
This eliminates contamination, corrosion, and mineral build up that can affect the braking operation.
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The brake is an “dual purpose” brake. It will control the drop rate during tripping,, absorb the energy from stopping,, and enable stop and hold in position to
make the next pipe connection.
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The brake can slip at very low speed (down to 0 RPM) smoothly making it ideal
for controlling WOB (the weight on the bit) without any chatter, stick slip or cogging
during the drilling operation.
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The brake control is a simple hydraulic pressure control on the brake actuation
piston system through a servo valve. This system is ideal for control via an autodriller for precise bit control in all methods of drilling either WOB (weight on bit),
CRP (Controlled Rate of Penetration), or simple manual control.
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Oil Shear Technology provides a dynamic torque to static torque ratio nearly
1:1 eliminating the sharp jerk when transitioning between dynamic slip, and static
lock up, reducing load on other transmission components, cabling, and top drive.

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The brake can be designed as spring set causing the brake to
engage in case of power failure reducing chance of damaged
bit, or lost drill stem.

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The Positorq Load Control auxiliary brake eliminates the need
for the mechanical brake on the winch drum except as a
standby backup for emergency stops.

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The Positorq LCB (Load Control Brake) is generally much less
weight than the Elmagco (Bayler) brake, and smaller in size. This
reduces rig area and weight improving allotment for other items.

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The multiple disc friction stack design means more torque in a
low inertia package. This relates to quicker response, less energy to be dissipated, and better control.

What’s in it for me?
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Faster Tripping—High energy absorbing and
smooth controllable stops can reduce the
time for tripping operation
Reduced Bit Cost—smooth quick control for
the WOB can increase bit life reducing need
for replacement.
Increased ROP—better more responsive bit
control can increase ROP (rate of penetration).
Reduced Weight—The smaller footprint and
lower weight increases allowance for other
items.

The deeper the hole the greater the savings