Casing valve

摘要

A safety mechanism (401) comprising: (i) an obstructing member (412,414) moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted; (ii) a movement mechanism (416,418); (iii) a wireless receiver (360), optionally a transceiver, adapted to receive a wireless signal such as electromagnetic or acoustic. The movement mechanism (416,418) is operable to move the obstructing member (412,414) from one of the first and second positions to the other of the first and second positions in response to a change in the signal being received by the wireless receiver (360). The safety mechanism also has (iv) a valve (401) in a casing sub; the valve (401) being adapted to move from one of the first and second positions to the other of the first and second positions, and then back to the first of the first and second positions.

主权项

1. A well comprising a safety mechanism, the safety mechanism comprising:
(i) an obstructing member, the obstructing member being a valve in a casing sub of a casing and the obstructing member moveable between a first position where fluid flow is permitted, and a second position where fluid flow is restricted; (ii) a movement mechanism; and (iii) a wireless receiver, adapted to receive a wireless signal; wherein the movement mechanism is operable to move the obstructing member from one of the first and second positions to the other of the first and second positions in response to a change in the signal being received by the wireless receiver, wherein the valve communicates between an inner and outer side of the casing with flow permitted through the casing between the inner and outer side of the casing with the obstructing member in the first position; and wherein the valve is adapted to move from one of the first and second positions to the other of the first and second positions, and then back to the one of the first and second positions.