Patent ID: 11920432
Assignee: DOWNHOLE PRODUCTS LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A toe valve for use in a wellbore, comprising:
a tubular mandrel;
a housing extending along a periphery of the mandrel;
couplings at longitudinal ends of the toe valve for assembly as part of a casing or liner string;
a valve piston disposed in an annulus formed between the housing and the mandrel, movable between an open position and a closed position, and disposed between a valve port of the housing and a valve port of the mandrel in the closed position;
an atmospheric chamber for facilitating movement of the valve piston to the open position;
a vent port formed through the housing and in fluid communication with the atmospheric chamber; and
a flow control device disposed in the vent port and operable to prevent fluid flow from the wellbore into the atmospheric chamber and allow fluid flow from the atmospheric chamber into the wellbore.