Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member such as a flapper that is disposed in a housing of the DDV and is
Methods and apparatus enable reliable and improved isolation between two portions of a bore extending through a casing string disposed in a borehole. A downhole deployment valve (DDV) may provide the isolation utilizing a valve member such as a flapper that is disposed in a housing of the DDV and is designed to close against a seat within the housing. The DDV includes an operating mechanism for opening/closing the DDV. In use, pressure in one portion of a well that is in fluid communication with a well surface may be bled off and open at well surface while maintaining pressure in another portion of the casing string beyond the DDV.
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1. A valve for use in a wellbore, the valve comprising: a housing having a bore;a valve member moveable between a first position permitting tool passage through the bore and a second position obstructing the bore through the housing; anda valve seat interface that the valve member contacts in the se
1. A valve for use in a wellbore, the valve comprising: a housing having a bore;a valve member moveable between a first position permitting tool passage through the bore and a second position obstructing the bore through the housing; anda valve seat interface that the valve member contacts in the second position, the valve seat interface comprising a seat ring disposed in a trough formed in the valve seat, the seat ring being movable in the trough between an extended position and a retracted position as a result of the movement of the valve member to the second position, and the seat ring being biased toward the extended position. 2. The valve of claim 1, wherein the seat ring includes a pointed end. 3. The valve of claim 1, wherein the seat ring is biased by a biasing member disposed between the seat ring and the trough. 4. The valve of claim 1, wherein the valve seat interface further comprises a ring seal disposed in the trough, the ring seal being configured to substantially prevent passage of fluid around the seat ring. 5. The valve of claim 1, wherein the valve seat interface further comprises a pin having a first end attached to the trough and a second end configured to engage a groove in the seat ring, the pin being configured to retain the seat ring in the trough. 6. A valve for use in a wellbore, the valve comprising: a housing having a bore;a valve member moveable between a first position permitting tool passage through the bore and a second position obstructing the bore through the housing; anda sealing structure disposed along an interface between the valve member and a valve seat, the sealing structure being a convex feature formed on one of the valve member or the valve seat that is configured to mate with a concave feature formed on the other one of the valve member or the valve seat when the valve member is in the second position. 7. A method for selectively isolating a zone in a wellbore, the method comprising: positioning a valve in the wellbore, the valve having a housing with a bore, a valve member, a valve seat, and a seat ring disposed in a trough formed in the valve seat;selectively isolating the zone in the wellbore by moving the valve member between a first position permitting tool passage through the bore and a second position obstructing the bore through the housing;moving the seat ring in the trough from an extended position to a retracted position as the valve member moves to the second position, the seat ring being biased toward the extended position; andcreating a sealing interface between the valve member and the seat ring when the valve member is in the second position. 8. The method of claim 7, wherein the seat ring is shaped so as to improve sealing between the valve member and the valve seat, preferably even in the presence of debris at the interface between the valve member and the valve seat. 9. The method of claim 7, wherein the seat ring includes a pointed end. 10. A valve for use in a wellbore, the valve comprising: a housing having a bore;a valve member pivotable around a pivot point between an open position and a closed position, the valve member being configured to obstruct the bore of the housing as the valve member engages a valve seat in the closed position; anda hinge member that is attached to the valve member at the pivot point, the hinge member being slidably connected to the housing by a connection member inserted through a slot formed in the hinge member, wherein there is relative movement between the connection member and the slot formed in the hinge member as the hinge member moves relative to the housing. 11. The valve of claim 10, wherein the hinge member is configured to move along a longitudinal axis of the housing as the valve member moves between the open position and the closed position. 12. The valve of claim 10, wherein the valve seat has an elliptical shape. 13. The valve of claim 10, further comprising a sealing element disposed at an interface between the valve member and the valve seat. 14. The valve of claim 13, wherein the sealing element is disposed in a seal groove formed in the valve seat. 15. A valve for use in a wellbore, the valve comprising: a housing having a bore;a valve member pivotable around a pivot point between an open position and a closed position, the valve member being configured to obstruct the bore of the housing as the valve member engages a valve seat in the closed position;a hinge member that is attached to the valve member at the pivot point, the hinge member being slidably connected to the housing; anda sealing element disposed at an interface between the valve member and the valve seat, wherein the valve member contacts the sealing element at a first stage of the closed position, and a gap is formed between the valve member and the valve seat. 16. The valve of claim 15, wherein the valve member contacts the valve seat at a second stage of the closed position, and the gap is closed. 17. The valve of claim 16, wherein the pivot point of the valve member moves along a longitudinal axis of the housing as the valve member moves from the first stage to the second stage of the closed position. 18. A method of selectively isolating a zone in a wellbore, the method comprising: positioning a valve in the wellbore, the valve having a housing, a valve member, and a slidable hinge member;selectively isolating the zone in the wellbore by moving the valve member from an open position to a closed position, the valve member being configured to obstruct a bore of the housing as the valve member engages a valve seat in the closed position;creating a seal between the valve member and a sealing element disposed at an interface between the valve member and the valve seat at a first stage of the closed position;creating a seal between the valve member and the valve seat at a second stage of the closed position; andmoving the hinge member along a longitudinal axis of the housing as the valve member moves between the open position and the second stage of the closed position. 19. The method of claim 18, wherein the valve member moves along the longitudinal axis of the housing with the hinge member to create the seal with the valve seat at the second stage of the closed position. 20. The method of claim 18, wherein the valve seat has an elliptical shape.
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