Weatherford Single-Joint Compensator
Weatherford’s single-joint compensator (SJC) is an innovative load-compensating device used to eliminate set-down weight from threaded connectors during makeup and thereby reduce the risk of thread galling and cross-threading. The SJC is also used to help the stabber align pipe vertically when Weatherford’s Stabberless system is not used.
The SJC is rigged up between the rig’s traveling block and the single-joint elevator (see illustration, next page) and uses pressure-compensated cylinders that are attached to the top of the bails on each side. Slings are connected from the cylinders to a bearing swivel below the elevator. From the swivel, a two-part sling is connected to a single-joint elevator. After the initial setting of the SJC system pressures, no further adjustment is required throughout the job. If a joint requires breakout, the SJC keeps the weight off the threads and safely lifts the pin out of the box, reducing the chance of the threads hanging.
If required, the SJC can be configured to use a visual indicator at the driller’s console to show that the compensator cylinders have reached optimal position.
Applications
• Minimizing or eliminating the potential of thread damage when running or pulling carbon steel or corrosion-resistant alloy tubulars
• Minimizing or eliminating the potential for thread damage when running or pulling casing with premium connections
Source: www.weatherford.com
