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1. WO2007095377 - MECANISME DE LIBERATION DE RESSORT A FRICTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims
1. A single-use release mechanism comprising:
a) a clamping means having a circumferential restriction state and a non-restriction state, providing circumferential restriction about a member load;
b) a spiral tensioning means having a wound state and an unwound state, wherein said wound state places said clamping means in said restriction state and said unwound state places said clamping means in said non-restriction state; and
c) a holding means whereby said spiral tensioning means is held in said wound state.

2. The mechanism of claim 1 , wherein said holding means comprises at least one wire attached to said spiral tensioning means and a meltable material attached to said at least one wire.

3. The mechanism of claim 2, wherein said holding means further comprises a resistance coil located proximate to said meltable material.

4. The mechanism of claim 1, wherein said holding means comprises at least one wire attached to said spiral tensioning means and a meltable solder joint attached to said at least one wire.

5. The mechanism of claim 4, wherein said meltable solder joint comprises a metallic alloy with relatively high creep resistance at elevated temperatures.

6. The mechanism of claim 4, wherein said meltable solder joint has a melting temperature in a range between about 500° Fahrenheit to about 1000° Fahrenheit.

7. The mechanism of claim 1, further comprising a force biasing means disposed upon the member load.

8. The mechanism of claim 7, wherein said force biasing means comprises a spring force means.

9. The mechanism of claim 7, wherein said force biasing means comprises a hydrostatic pressure force means.

10. The mechanism of claim 1, wherein said clamping means comprises movable jaws.

11. The mechanism of claim 10, wherein said movable jaws further comprises movable balls captured within a frame.

12. The mechanism of claim 10, wherein said movable jaws further comprises a segmented frame and a segmented conical section, wherein said segmented conical section is
approximately shaped to receive a conical section disposed on the member load.

13. The mechanism of claim 1, used to shift a valve.

14. The mechanism of claim 13, wherein said valve is used to set a packer.

15. The release mechanism of claim 1, used to release dogs in a toolstring.

16. The mechanism of claim 1, wherein said clamping means comprises a frame, a plurality of balls received by said frame, said balls providing circumferential restriction about said member load.

17. A one-shot thermally activated release mechanism comprising:
a) a set of jaws;
b) a spring wound around said set of jaws;
c) a meltable material;
d) a first wire;
e) a first end of said first wire affixed to said spring, and a second end of said first wire affixed to said meltable material;
f) a second wire;
g) a first end of said second wire affixed to said meltable material, and a second end of said second wire affixed to said jaws; and
h) a heating element disposed proximate to said meltable material.

18. The mechanism of claim 17, wherein said meltable material is a meltable solder joint.

19. The mechanism of claim 17, wherein said meltable material comprises a metallic alloy having a relatively high creep resistance at elevated temperatures.

20. The mechanism of claim 17, wherein said meltable material has a melting temperature in a range between about 500° Fahrenheit to about 1000° Fahrenheit.

21. The mechanism of claim 17, wherein said heating element further comprises a resistance coil located disposed proximate to said meltable material.

22. The mechanism of claim 17, further comprising a force biasing means disposed upon said set of jaws.

23. The mechanism of claim 22, wherein said force biasing means comprises a member load and a spring force means.

24. The mechanism of claim 22, wherein said force biasing means comprises a member load and a hydrostatic pressure force means.

25. The mechanism of claim 17, wherein said set of jaws further comprises a segmented frame and a segmented conical section, wherein said segmented conical section is
approximately shaped to receive a conical section disposed upon a member load.

26. The mechanism of claim 17, used to shift a valve.

27. The mechanism of claim 26, wherein said valve is used to set a packer.

28. The release mechanism of claim 17, used to release dogs in a toolstring.

29. The mechanism of claim 17, wherein said set of jaws comprises a frame, a plurality of balls received by said frame, wherein said balls provide circumferential restriction about a member load.

30. A method of releasing a one-shot member ioad using a thermally activated release mechanism having a spring, a least one wire holding said spring in a compressed state, jaws held in a restriction state by said spring, a plunger, said jaws providing restriction to said plunger, preventing said plunger from moving past said jaws, a pressure bias on said plunger, and a heating element, wherein said at least one wire may be separated, thereby releasing said spring from the compressed state, the method comprising the steps of: .
a) heating said at least one wire;
b) releasing said spring from the compressed state;
c) releasing said jaws from the restriction state;
d) removing the restriction on said plunger; and
e) applying said pressure bias on said plunger, thereby assisting said plunger to move past said jaws.