Isolation valve for use in a wellbore

A system for isolating a portion of a wellbore comprising:

• a string of production tubing;
• an isolation valve assembly comprising,
• a housing having an uphole end coupled with the string of production tubing and an opening in communication with the wellbore on a downhole end that is distal from the uphole end,
• a shifting sleeve axially moveable within the housing,
• a valve element in the housing moveable from a closed configuration to an open configuration in response to downhole movement of the shifting sleeve,
• a retraction sleeve having a helical thread that circumscribes an axis of the housing, and
• a deployment sleeve that is selectively moveable downhole with downhole movement of the shifting sleeve to an opening location that interferes with movement of the valve element from the open configuration to the closed configuration, and into anchoring engagement with the helical thread;
• and
• a packer assembly circumscribing the housing.

A system for isolating a portion of a wellbore comprising:

• a housing selectively anchored in the wellbore and having a bore;
• a valve element in the housing that is selectively in a closed position that is in interfering contact with flow through the bore, and selectively in an opened position that is away from interfering contact with the flow;
• a deployment sleeve in the housing for selectively maintaining the valve element in the opened position;
• a means for axially urging the deployment sleeve into a position for maintaining the valve element in the opened position;
• a means for securing the deployment sleeve in the position for maintaining the valve element in the opened position, the means comprising a helical member, in which the deployment sleeve is selectively received within the helical member;
• and
• a means for retracting the deployment sleeve from the position for maintaining the valve in the opened position by rotating the helical member with respect to the deployment sleeve to generate a lifting force that urges the deployment sleeve axially away from the valve element and out of interference with the valve element moving into the closed position.