A well tool can include a swellable material, and a degradable material which supports the swellable material, but which degrades in response to contact with a selected fluid in a well. A packer for use in a subterranean well can include a swellable material, and a degradable material which supports
A well tool can include a swellable material, and a degradable material which supports the swellable material, but which degrades in response to contact with a selected fluid in a well. A packer for use in a subterranean well can include a swellable material, and a degradable material which supports the swellable material. A method of unsetting a packer in a subterranean well can include the steps of, after the packer has been set in the well, exposing a degradable material of the packer to a selected fluid, thereby degrading the degradable material, and a seal element of the packer being unsupported by the degradable material in response to the exposing step.
대표청구항▼
1. A well tool, comprising: a swellable material; anda degradable material which radially outwardly supports the swellable material, but which degrades in response to contact with a selected fluid in a well via a non-degradable passage through a wall of the well tool. 2. The well tool of claim 1, wh
1. A well tool, comprising: a swellable material; anda degradable material which radially outwardly supports the swellable material, but which degrades in response to contact with a selected fluid in a well via a non-degradable passage through a wall of the well tool. 2. The well tool of claim 1, wherein the swellable material is included in a seal element. 3. The well tool of claim 1, wherein the degradable material is positioned between the swellable material and a generally tubular mandrel. 4. The well tool of claim 1, wherein the swellable material increases in volume in the well. 5. The well tool of claim 1, wherein the fluid comprises water. 6. The well tool of claim 1, wherein the degradable material comprises sodium. 7. The well tool of claim 1, wherein the degradable material comprises potassium. 8. The well tool of claim 1, wherein the degradable material comprises an oxygen source. 9. The well tool of claim 8, wherein the oxygen source comprises peroxide. 10. The well tool of claim 1, wherein the degradable material comprises an anhydrous boron compound. 11. A packer for use in a subterranean well, the packer comprising: a swellable material;a degradable material which radially outwardly supports the swellable material; anda non-degradable passage for fluid to contact the degradable material disposed in a wall of the packer. 12. The packer of claim 11, wherein the swellable material is included in a seal element of the packer. 13. The packer of claim 11, wherein the degradable material is positioned between the swellable material and a generally tubular mandrel of the packer. 14. The packer of claim 11, wherein the degradable material degrades in response to contact with a selected fluid in the well. 15. The packer of claim 14, wherein the fluid comprises water. 16. The packer of claim 11, wherein the degradable material comprises sodium. 17. The packer of claim 11, wherein the degradable material comprises potassium. 18. The packer of claim 11, wherein the degradable material comprises an oxygen source. 19. The packer of claim 18, wherein the oxygen source comprises peroxide. 20. The packer of claim 11, wherein the degradable material comprises an anhydrous boron compound.
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