1.
n. [Well Workover and Intervention]
A
blowout preventer (
BOP) closing element fitted with hardened tool steel blades designed to
cut the
drillpipe or tubing when the BOP is closed, and then fully close to provide isolation or sealing of the wellbore. A
shear ram is normally used as a last resort to regain
pressure control of a well that is flowing. Once the pipe is cut (or sheared) by the shear rams, it is usually left hanging in the BOP
stack, and kill operations become more difficult. The
joint of drillpipe or tubing is destroyed in the process, but the rest of the string is unharmed by the operation of shear rams.