Patent ID: 9062514
Filing Date: 2015-06-23
Classification: E21B

Abstract:
1. A tool usable with a well, comprising: a valve element having a first state and a second state; a first mechanical operator, comprising a piston having a first face and a second face; a pilot valve to control communication of an annulus pressure to the first mechanical operator; and a second mechanical operator to respond to annulus pressure to control operation of the pilot valve, wherein the second mechanical operator is adapted to cause pilot valve to communicate the annulus pressure to the first face of the first mechanical operator to cause the first mechanical operator to transition the valve element from the first state to the second state in response to the annulus pressure exhibiting a predetermined signature, and communicate the annulus pressure to the second face of the first mechanical operator and block communication of the annulus pressure to the first faceoff the first mechanical operator to cause the first mechanical operator to transition the valve element from the second state to the first state, wherein annulus pressure is continuously applied to the second face of the first mechanical operator.