초록 ▼

Casing expansion and formation compression for permeability plane orientation. A method of forming at least one increased permeability plane in a subterranean formation includes the steps of: installing a casing section in a wellbore intersecting the formation; expanding the casing section in the we

Casing expansion and formation compression for permeability plane orientation. A method of forming at least one increased permeability plane in a subterranean formation includes the steps of: installing a casing section in a wellbore intersecting the formation; expanding the casing section in the wellbore; and then injecting a fluid into the formation, the injecting step being performed after the expanding step is completed. Another method includes the steps of: applying an increased compressive stress to the formation, the compressive stress being radially directed relative to a wellbore intersecting the formation; and then piercing the formation radially outward from the wellbore, thereby initiating the increased permeability plane. Yet another method includes the steps of: applying a reduced stress to the formation, the reduced stress being directed orthogonal to a wellbore intersecting the formation; and then piercing the formation with at least one penetration extending radially outward from the wellbore, thereby relieving the reduced stress at the penetration.

대표청구항 ▼

What is claimed is: 1. A method of forming at least one increased permeability plane in a subterranean formation, the method comprising the steps of: installing a casing section in a wellbore intersecting the formation; positioning a hardenable fluid in an annulus between the casing section and the

What is claimed is: 1. A method of forming at least one increased permeability plane in a subterranean formation, the method comprising the steps of: installing a casing section in a wellbore intersecting the formation; positioning a hardenable fluid in an annulus between the casing section and the wellbore; permitting the hardenable fluid to harden; expanding the casing section, thereby applying radially directed increased compressive stresses to at least two circumferential portions of the wellbore; and then injecting a first fluid into the formation, thereby propagating the at least one increased permeability plane between the at least two circumferential portions of the wellbore, the injecting step being initiated after the expanding step is completed. 2. The method of claim 1, wherein the expanding step further comprises reducing a stress in the formation, the reduced stress being directed orthogonal to a wellbore intersecting the formation. 3. The method of claim 2, further comprising the step of, after the expanding step is completed, piercing the formation with at least one penetration extending radially outward from the wellbore, thereby relieving the reduced stress at the penetration. 4. The method of claim 1, wherein the expanding step further comprises applying a compressive stress to the formation, the compressive stress being radially directed relative to a wellbore intersecting the formation. 5. The method of claim 4, further comprising the step of, after the expanding step is completed, piercing the formation radially outward from the wellbore, thereby initiating the plane. 6. The method of claim 1, wherein the expanding step further comprises forming at least one opening through a sidewall of the casing section. 7. The method of claim 1, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of preventing a reduction of the opening width after the expanding step. 8. The method of claim 1, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of limiting the width of the opening. 9. The method of claim 1, wherein the expanding step further comprises using a second fluid to expand the casing section, the second fluid being different from the first fluid. 10. A method of forming at least one increased permeability plane in a subterranean formation, the method comprising the steps of: applying an increased compressive stress to the formation, the compressive stress being radially directed to at least two circumferential portions of a wellbore intersecting the formation; and then propagating the plane between the at least two circumferential portions by injecting a first fluid into the formation radially outward from the wellbore, wherein the increased compressive stress applying step is completed prior to performing the propagating step. 11. The method of claim 10, wherein the compressive stress applying step is performed by expanding a casing section radially outward in the wellbore. 12. The method of claim 11, wherein the expanding step is completed prior to performing the propagating step. 13. The method of claim 11, wherein the expanding step further comprises forming at least one opening through a sidewall of the casing section. 14. The method of claim 11, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of preventing a reduction of the opening width after the expanding step. 15. The method of claim 11, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of limiting the width of the opening. 16. The method of claim 11, further comprising the step of enlarging the plane by injecting the first fluid through at least one opening in a sidewall of the casing section. 17. The method of claim 16, wherein the enlarging step is performed after the expanding step is completed. 18. The method of claim 16, wherein the expanding step further comprises using a second fluid to expand the casing section, the second fluid being different from the first fluid. 19. The method of claim 10, wherein the propagating step further comprises forming penetrations into the formation after the expanding step. 20. The method of claim 19, wherein the penetrations forming step further comprises forming a longitudinally extending slot in the wellbore. 21. The method of claim 19, wherein the penetrations forming step further comprises forming perforations into the formation. 22. A method of forming at least one increased permeability plane in a subterranean formation, the method comprising the steps of: installing a casing section in a wellbore intersecting the formation; positioning a hardenable fluid in an annulus between the casing section and the wellbore; permitting the hardenable fluid to harden; reducing a stress in the formation by expanding the hardened fluid radially outward in the wellbore, the reduced stress being directed orthogonal to the wellbore; and then piercing the formation with at least one penetration extending radially outward from the wellbore, thereby relieving the reduced stress at the penetration, and the hardened fluid expanding step being completed prior to the piercing step being initiated. 23. The method of claim 22, wherein the piercing step further comprises perforating the formation. 24. The method of claim 22, wherein the piercing step further comprises forming a longitudinally extending slot in the wellbore. 25. The method of claim 24, wherein the slot extends through the casing section lining the wellbore. 26. The method of claim 22, wherein the stress reducing step is performed by expanding the casing section radially outward in the wellbore. 27. The method of claim 26, wherein the expanding step is completed prior to performing the piercing step. 28. The method of claim 26, wherein the expanding step further comprises forming at least one opening through a sidewall of the casing section. 29. The method of claim 26, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of preventing a reduction of the opening width after the expanding step. 30. The method of claim 26, wherein the expanding step further comprises increasing a width of at least one opening in a sidewall of the casing section, and further comprising the step of limiting the width of the opening. 31. The method of claim 26, further comprising the step of enlarging the plane by injecting a first fluid through at least one opening in a sidewall of the casing section. 32. The method of claim 31, wherein the enlarging step is performed after the expanding step is completed. 33. The method of claim 31, wherein the expanding step further comprises using a second fluid to expand the casing section, the second fluid being different from the first fluid.