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Powered Capstan Winch, Power Sheave and Traction Winch

Zone Power has developed the Powered Capstan (also known as a Power Sheave, Capstan Winch or Traction Winch by some of our clients).

The Powered Capstan assists standard wire-line winch units operating in deep deviated wells. It can give up to 9,000lbs assistance thereby allowing standard winch units to be used beyond their normal operating range and removing the need for custom winch units. The Powered Capstan automatically maintains the winch drum at a screen selected "TARGET" tension with the cable running in either direction.

A typical 4000lbs target will be maintained on the winch whether the actual well tension is 13,000lbs when hoisting, or only 200lbs when running cable into the well.

Powered Capstan Torque Unit

Standard Features of the Powered Capstan

  • Maintains constant cable tension on winch drum
  • Operator friendly package design
  • Allows deep deviated high tension wells to be managed
  • Advantage over other conveyance methods
  • Reduces rig down time
  • Improves cable life
  • Reduces conductor failure
  • Improves productivity
  • Eliminates drum crush
  • Runs multiple tools
  • Adds to wire line safety
  • Cable head can be retained for speedy rig up
  • Capstan and Power Pack both rated Zone 1
  • 3 Part lift - all with DNV 2-7.1 certification
  • Minimal maintenance package
  • Steelwork 10 year corrosion protection

The Powered Capstan comprises of three main parts, the Capstan, the Power Pack and the Control Panel

Powered Capstan Torque Unit

Capstan Winch

  • Automatically maintains the winch drum at a screen selected "TARGET" tension with cable running in either direction
  • Wire line cable is carried around twin 31" diameter torque wheels by steel segments machined to give 180° of support to the cable diameter
  • The grooves are machined to suit selected cable
  • ZP system is fully automatic in operation and follows the cable speed and direction, as dictated by winch operator
  • Rim pull assistance from Capstan is proportionally applied up to 9,000lbs in either direction
  • Speeds to 300ft/min when applying power
  • Freewheel speed exceeds the normal winch operating range
  • Applied rim pull is governed by the well tension.
  • Control system achieves an extremely smooth application of rim pull to the running or static cable
  • The capstan has been designed to be used either secured to the horizontal deck, or be supported vertically in the derrick by the elevators
  • Main control panel is designed to run two independent inline tension devices, thereby eliminating the need for any electrical interface to the present well tension circuit
  • Supplied in a Transit Frame, easily removed from the side or from the top, complete with lifting slings
Powered Capstan Power Pack

Hydraulic Power Pack

  • Optional electric or diesel prime movers
  • Optional Zone 2 and non hazardous certification
  • Detachable 50ft or 100ft hydraulic hoses
  • Fitted with 200ft multi core control cables
Powered Capstan Control Panel

Main Control Console

  • This item has to be under the control of the cab safety shut down system if located in a pressurized cab and is sited in Zone 2 area
  • Programmable logic controller (PLC) automatically maintains the winch at the selected "TARGET TENSION" irrespective of cable direction and well tension - within design parameters Winch "Target" tension can be altered by the winch operator whilst running the job
  • Operator friendly screen displays all required parameters
  • Analog and digital presentation for operator
  • Screen options provide six control modes and preferred displays
  • Alarms, sounder, settings menu, instrumentation and manual stop control of power pack
  • The control options allow the program to compute using well signal only, combined well and winch signals , or just the winch signal only
  • Provided with it's own transit case that normally ships in the hose basket

Shipping Dimensions and Weights

Torque Unit

Dimensions 2935mm long x 1251mm wide x 1330mm high
Shipping Weight 4750 kilos

Torque Unit Transit Frame

Dimensions 3515mm long x 1650mm wide x 1980mm high
Shipping Weight 1250 kilos

Hydraulic Power Pack

Dimensions 2270mm long x 1800mm wide x 2465mm high
Shipping Weight 4000 kilos

Hose Basket

Dimensions 1600mm long x 1600mm wide x 1160mm high
Shipping Weight 850 kilos

Powered Capstan Winch Features

  • Deviated winch
  • Deviated captstan
  • Deviated sheave
  • Deep well winch
  • Prime pulling winch
  • Friction winch
  • Deep well assistance
  • High well tensions
  • Gulf coast use
  • Dynamic testing
  • Simulator rig
  • Increased winch capacity
  • ATEX