Toe valve

1. A toe valve, comprising:

(a) a bore extending through said valve;

(b) a first sub having an inner end;

(c) a second sub having an inner end;

(d) a housing, said housing:

i) having a port; and

ii) coupling said first and second subs such that said inner ends of said subs are spaced apart axially, and said housing is spaced radially from said inner ends of said subs; and

(e) a sleeve, said sleeve:

i) being mounted for hydraulic displacement in said radial space between said housing and said inner ends of said subs; and

ii) having a passage extending radially through the wall of said sleeve and in fluid communication with said bore and said axial space between said inner ends of said subs;

(f) wherein said sleeve is moveable in response to fluid pressure from said bore through said passage, said sleeve being movable from a closed position, in which said sleeve restricts flow out of said bore through said port, to an open position, in which said sleeve allows flow out of said bore through said port.

2. The toe valve of claim 1 , wherein said sleeve passage is covered by said first sub when said sleeve is in said closed position.

3. The toe valve of claim 2 , wherein a radial clearance between said sleeve and said first sub provides fluid communication between said sleeve passage and said axial space between said inner ends of said subs.

4. A method of performing a well operation, said method comprising:

(a) providing a liner assembly comprising a toe valve of claim 3 ;

(b) increasing hydraulic pressure in said liner assembly to open said toe valve and discharge fluids from said liner assembly through said toe valve.

5. A method of performing a well operation, said method comprising:

(a) providing a liner assembly comprising a toe valve of claim 2 ,

(b) increasing hydraulic pressure in said liner assembly to open said toe valve and discharge fluids from said liner assembly through said toe valve.

6. The toe valve of claim 1 , wherein a radial clearance between said sleeve and said first sub provides fluid communication between said sleeve passage and said axial space between said inner ends of said subs.

7. The toe valve of claim 1 , wherein said inner end of each of said first and second subs comprises a portion of reduced outer diameter and wherein said housing is spaced radially outward from said portions of reduced outer diameter.

8. The toe valve of claim 1 , wherein said inner end of each said first and second subs comprise a portion of a first reduced outer diameter and a portion of a second reduced outer diameter; and wherein said housing is coupled to said inner ends of said subs at said portions of first reduced outer diameter and is spaced radially outward from said portions of second reduced outer diameter.

9. The toe valve of claim 1 , wherein said housing couples said subs by threaded connections.

10. The toe valve of claim 1 , wherein said sleeve comprises a pressure release device disposed in said passage.

11. The toe valve of claim 10 , wherein said pressure release device is a rupture disc, check valve, or pressure relief valve.

12. The toe valve of claim 10 , wherein said pressure release device is a rupture disc.

13. The toe valve of claim 10 , wherein said pressure release device is covered by said first sub when said sleeve is in its said closed position.

14. The toe valve of claim 1 , wherein said sleeve is releasably retained in the open position.

15. The toe valve of claim 14 , wherein said sleeve is releasably retained in the open position by a lock ring engaging one of said subs and said sleeve.

16. The toe valve of claim 14 , wherein said sleeve is releasably retained in the open position by self-locking tapers.

17. A method of performing a well operation, said method comprising:

(a) providing a liner assembly comprising a toe valve of claim 1 ;

(b) increasing hydraulic pressure in said liner assembly to open said toe valve and discharge fluids from said liner assembly through said toe valve.

18. A toe valve, comprising:

(a) a valve body comprising a sub;

(b) a bore extending through said valve: body and said sub;

(c) a port; and

(d) a sleeve, said sleeve:

i) being mounted for hydraulic displacement; and

ii) having a passage through said sleeve and in fluid communication with said bore;

(e) wherein said sleeve is moveable in response to fluid pressure from said bore through said passage, said sleeve being movable from a closed position, in which said sleeve restricts flow out of said bore through said port, to an open position, in which said sleeve allows flow out of said bore through said port; and

(f) wherein said passage is covered by said sub when said sleeve is in its said closed position.

19. The toe valve of claim 18 , wherein a radial clearance between said sleeve and said sub provides fluid communication between said sleeve passage and said bore.

20. A method of performing a well operation, said method comprising:

(a) providing a liner assembly comprising a toe valve of claim 19 ;

(b) increasing hydraulic pressure in said liner assembly to open said toe valve and discharge fluids from said liner assembly through said toe valve.

21. The toe valve of claim 18 , wherein said sleeve comprises a pressure release device disposed in said passage.

22. The toe valve of claim 21 , wherein said pressure release device is a rupture disc.

23. A method of performing a well operation, said method comprising:

(a) providing a liner assembly comprising a toe valve of claim 18 ;

(b) increasing hydraulic pressure in said liner assembly to open said toe valve and discharge fluids from said liner assembly through said toe valve.

24. The toe valve of claim 19 , wherein said sleeve comprises a pressure release device.