When completing a well, a normal operation is to displace the mud with brines. As brines typically contain less friction-reducing agents, the rotating friction may increase. The brine is often displaced through the bottom of the string, potentially exposing the lower section to higher torque than the upper string. This situation may be difficult to predict and even more difficult to control during operation.
Innovar has developed the Safety Shear Swivel to minimize the risk of undesired torque being applied to the lower part of the string, and to reduce the risk of damaging the string.
The Safety Shear Swivel serves several important functions:
- It is a controlled weak-link. The Safety Shear Swivel can be set to shear at the desired torque.
- It serves as the cross over sub from the upper and larger pipe to the lower and smaller pipe. Saving the cost of a rental thread cross over sub.
Built with high-quality radial and thrust roller bearings, the Safety Shear Swivel is designed to accept continued rotation of the upper string, while the lower string is held stationary and attached in both tension and compression. Seals maintain a 5000 psi internal working pressure before activation. While rotating, low friction dynamic seals continue to restrict leaks and preserve the bearing technology, even after the high-pressure seals start to wear out.
The Safety Shear Swivel is designed to be redressed on-site and all threaded connections are mechanically locked from coming loose while in downhole service.