FLEXIBLE CONNECTION FOR ROTATING BLOWOUT PREVENTER

摘要

A rotating blowout preventer or wellhead mounted on and above but not rigidly attached to a blowout preventer stack. The attachment between the blowout preventer and the blowout preventer stack is flexible but pressuretight. The attachment allows lateral movement of the blowout preventer or rotating head and the drill string or kelly so that stresses resulting from a crooked or nonaligned kelly or eccentric location of a drill string are not created in the rotating blowout preventer or head while stationary or while rotating.