Patent ID: 9677382
Date: 2017-06-13
CPC Classifications: E21B

Claim:
1. An assembly configured for use in a drill string that includes a drill string tool, the drill string having an internal bore to convey drilling fluid, the assembly comprising: an elongate housing configured for incorporation in the drill string; a switch member displaceably mounted on the housing and configured for connection to the drill string tool to switch the drill string tool between an activated condition and a deactivated condition in response to driven movement of the switch member in an activating direction and in an opposite deactivating direction, respectively; a pair of hydraulic rams mounted on the housing and configured for oppositely directed movement respectively in the activating direction and in the deactivating direction in response to above-threshold drilling fluid conditions at the housing, so that the pair of hydraulic rams comprises an activator ram and a deactivator ram; and a coupling mechanism configured for operator-controlled selective switching between