Casing or liner barrier with remote interventionless actuation feature
A tubular string is run into a wellbore with a remotely actuated valve near a lower end adjacent a cementing shoe. The valve is triggered to operate without intervention such as by mud pulses generated at the surface and recognized by a sensor linked to a processor adjacent the valve to trigger the valve to close. Alternative actuation systems are envisioned for the valve that is located near the cementing shoe.
1. A completion method for a tubular casing string delivered to a subterranean location, comprising:
running in a tubular casing string to a predetermined open hole location, said casing string having a shoe adjacent a lower end thereof;
providing a valve in said casing string adjacent said shoe;
signaling said valve from outside the open hole location or within a passage or wall of said casing string to close from a surface access location to the subterranean location;
closing said valve without intervention in said casing string when said string is cemented until before delivered cement though said casing string sets up.
2. The method of claim 1 , further comprising:
generating pulses at said surface access location.
3. The method of claim 2 , further comprising:
sensing said pulses adjacent said valve.
4. The method of claim 3 , further comprising:
operating said valve in response to interpretation of said pulses.
5. The method of claim 2 , further comprising:
using a pump and choke or bypass line to generate said pulses.
6. The method of claim 1 , further comprising:
avoiding the use of a ball or plug as said intervention.
7. The method of claim 1 , further comprising:
closing said valve with acoustic or vibration signals.