Patent ID: 9157718
Filing Date: 2015-10-13
Classification: E21B,F42C

Abstract:
1. An interruption sub for a downhole tool, the downhole tool activatable by detonation, the interruption sub comprising: a detonation path within the interruption sub; a barrier rotatable between a biased closed position and an open position, and preventing ballistic transfer to the downhole tool in the closed position by blocking the detonation path, and allowing ballistic transfer to the downhole tool in the open position by unblocking the detonation path; and, a longitudinally movable control arm engageable with the barrier, the control arm biased away from a first end of the interruption sub to retain the barrier in the biased closed position; wherein the control arm is hydraulically or electromechanically longitudinally activatable to move towards the first end of the interruption sub and towards the barrier to rotate the barrier against its bias to the open position in response to at least one condition acceptable for ballistic transfer.