초록 ▼

Improved in-situ filter cake degradation compositions for use in subterranean formations, well drill-in and servicing fluids including such in-situ filter cake degradation compositions, and methods of using such in-situ filter cake degradation compositions and well drill-in and servicing fluids in s

Improved in-situ filter cake degradation compositions for use in subterranean formations, well drill-in and servicing fluids including such in-situ filter cake degradation compositions, and methods of using such in-situ filter cake degradation compositions and well drill-in and servicing fluids in subterranean operations are provided. An example of a method is a method for forming a self-degrading filter cake in a subterranean formation. Another example of a method is a method of drilling a well bore in a subterranean formation. Another example of a method is a method of degrading a filter cake in a subterranean formation. An example of a composition is a well drill-in and servicing fluid. Another example of a composition is an in-situ filter cake degradation composition.

대표청구항 ▼

What is claimed is: 1. A method for forming a self-degrading filter cake in a subterranean formation, comprising: placing a well drill-in and servicing fluid in a subterranean formation, the well drill-in and servicing fluid comprising a base fluid, a viscosifier, a fluid loss control additive, a b

What is claimed is: 1. A method for forming a self-degrading filter cake in a subterranean formation, comprising: placing a well drill-in and servicing fluid in a subterranean formation, the well drill-in and servicing fluid comprising a base fluid, a viscosifier, a fluid loss control additive, a bridging agent, and an in-situ filter cake degradation composition comprising at least one delayed-release acid component selected from the group consisting of an ortho ester and a poly(ortho ester), wherein the delayed-release acid component is present in the in-situ filter cake degradation composition in an amount in the range of from about 1% to about 75% by weight, and an initiator component present in the in-situ filter cake degradation composition in an amount in the range of from about 0.1% to about 4% by weight; and forming a filter cake upon a surface within the formation. 2. The method of claim 1 wherein the base fluid is aqueous-based, nonaqueous-based, or a mixture thereof. 3. The method of claim 2 wherein the nonaqueous-based base fluid comprises at least one component selected from the group consisting of: a mineral oil, a synthetic oil, an ester, and any derivative thereof. 4. The method of claim 1 further comprising permitting the delayed-release acid component to release an acid; and permitting the initiator component to react with the released acid to produce an oxidizer. 5. The method of claim 4 wherein the oxidizer is hydrogen peroxide. 6. The method of claim 1 wherein forming a filter cake upon a surface within the formation comprises forming the filter cake upon the face of the formation itself, upon a sand screen, or upon a gravel pack. 7. The method of claim 1 wherein the base fluid is present in the well drill-in and servicing fluid in an amount in the range of from about 20% to about 99.99% by volume. 8. The method of claim 1 wherein the viscosifier comprises at least viscosifier selected from the group consisting of: a biopolymer, cellulose, a cellulose derivative, guar, and any guar derivative. 9. The method of claim 1 wherein the viscosifier is present in the well drill-in and servicing fluid in an amount sufficient to provide a desired degree of solids suspension. 10. The method of claim 1 wherein the viscosifier is present in the well drill-in and servicing fluid in an amount in the range of from about 0.2% to about 0.6% by weight. 11. The method of claim 1 wherein the fluid loss control additive is present in the well drill-in and servicing fluid in an amount sufficient to provide a desired degree of fluid loss control. 12. The method of claim 1 wherein the fluid loss control additive is present in the well drill-in and servicing fluid in an amount in the range of from about 0.01% to about 3% by weight. 13. The method of claim 1 wherein the bridging agent comprises at least one of the following: calcium carbonate, a magnesium compound, a chemically bonded ceramic bridging agent, or a derivative thereof. 14. The method of claim 1 wherein the bridging agent is present in the well drill-in and servicing fluid in an amount sufficient to create an efficient filter cake. 15. The method of claim 1 wherein the bridging agent is present in the well drill-in and servicing fluid in an amount in the range of from about 0.1% to about 32% by weight. 16. The method of claim 1 wherein the in-situ filter cake degradation composition is present in the well-drill in and servicing fluid in an amount sufficient to remove, to a desired degree, a filter cake that has been established in a subterranean formation by the well drill-in and servicing fluid. 17. The method of claim 1 wherein the in-situ filter cake degradation composition is present in the well drill-in and servicing fluid in an amount in the range of from about 10% to about 25% by weight of the well drill-in and servicing fluid. 18. The method of claim 1 wherein the delayed-release acid component further comprises at least one component selected from the group consisting of: an ester; an aliphatic polyester; a lactide; a poly(lactide); a glycolide; a poly(glycolide); a lactone; a poly(ε-caprolactone); a poly(hydroxybutyrate); an anhydride; a poly(anhydride); a poly(amino acid); an esterase enzyme; and any derivative thereof. 19. The method of claim 1 wherein the delayed-release acid component comprises a blend of poly(lactic acid) and an ortho ester. 20. The method of claim 1 wherein the initiator component comprises lactate oxidase, or a derivative thereof. 21. The method of claim 1 wherein the initiator component comprises lactate oxidase, or a derivative thereof. 22. The method of claim 1 wherein the initiator component comprises lactate oxidase, the delayed-release acid component further comprises poly(lactic acid), and the method further comprises: permitting the poly(lactic acid) to release lactic acid; and permitting the lactate oxidase to react with the lactic acid to produce an oxidizer. 23. A method of drilling a well bore in a subterranean formation, comprising: using a well drill-in and servicing fluid to drill a well bore in a subterranean formation, the well drill-in and servicing fluid comprising a base fluid, a viscosifier, a fluid loss control additive, a bridging agent, and an in-situ filter cake degradation composition comprising at least one delayed-release acid component selected from the group consisting of an ortho ester and a poly(ortho ester), wherein the delayed-release acid component is present in the in-situ filter cake degradation composition in an amount in the range of from about 1% to about 75% by weight, and an initiator component present in the in-situ filter cake degradation composition in an amount in the range of from about 0.1% to about 4% by weight; permitting the well drill-in and servicing fluid to establish a filter cake in at least a portion of the well bore; and permitting the filter cake to degrade. 24. The method of claim 23 wherein the base fluid is aqueous-based, nonaqueous-based, or a mixture thereof. 25. The method of claim 24 wherein the nonaqueous-based base fluid comprises at least one component selected from the group consisting of: a mineral oil, a synthetic oil, an ester, and any derivative thereof. 26. The method of claim 23 wherein permitting the filter cake to degrade comprises: allowing the delayed-release acid component to release an acid; allowing the initiator component to interact with the released acid to produce an oxidizer; allowing the released acid to degrade at least a portion of the inorganic portion of the filter cake; and allowing the oxidizer to degrade at least a portion of the organic portion of the filter cake. 27. The method of claim 26 wherein the oxidizer is hydrogen peroxide. 28. The method of claim 23 wherein forming a filter cake upon a surface within the formation comprises forming the filter cake upon the face of the formation itself, upon a sand screen, or upon a gravel pack. 29. The method of claim 23 wherein the viscosifier comprises at least viscosifier selected from the group consisting of: a biopolymer, cellulose, a cellulose derivative, guar, and any guar derivative. 30. The method of claim 23 wherein the bridging agent comprises at least component selected from the group consisting of: calcium carbonate, a magnesium compound, a chemically bonded ceramic bridging agent, and any derivative thereof. 31. The method of claim 23 wherein the bridging agent is present in the well drill-in and servicing fluid in an amount in the range of from about 0.1% to about 32% by weight. 32. The method of claim 23 wherein the in-situ filter cake degradation composition is present in the well drill-in and servicing fluid in an amount in the range of from about 10% to about 25% by weight of the well drill-in and servicing fluid. 33. The method of claim 23 wherein the delayed-release acid component further comprises at least one component selected from the group consisting of: an ester; an aliphatic polyester; a lactide; a poly(lactide); a glycolide; a poly(glycolide); a lactone; a poly(ε-caprolactone); a poly(hydroxybutyrate); an anhydride; a poly(anhydride); a poly(amino acid); an esterase enzyme; and any derivative thereof. 34. The method of claim 23 wherein the delayed-release acid component comprises a blend of poly(lactic acid) and an ortho ester. 35. The method of claim 23 wherein the initiator component comprises lactate oxidase, or a derivative thereof. 36. The method of claim 23 wherein the initiator component comprises lactate oxidase, or a derivative thereof. 37. The method of claim 23 wherein the step of using a well drill-in and servicing fluid to drill a well bore in a subterranean formation comprises circulating the well drill-in and servicing fluid through a drill pipe and drill bit in contact with the subterranean formation. 38. The method of claim 23 wherein the initiator component comprises lactate oxidase, the delayed-release acid component further comprises poly(lactic acid), and permitting the filter cake to degrade comprises: allowing the poly(lactic acid) to release lactic acid; allowing the lactate oxidase to interact with the lactic acid to produce an oxidizer; allowing the lactic acid to degrade at least a portion of the inorganic portion of the filter cake; and allowing the oxidizer to degrade at least a portion of the organic portion of the filter cake. 39. A method of degrading a filter cake in a subterranean formation, the filter cake comprising an inorganic portion and an organic portion, the method comprising: introducing an in-situ filter cake degradation composition comprising at least one delayed-release acid component selected from the group consisting of an ortho ester and a poly(ortho ester), wherein the delayed-release acid component is present in the in-situ filter cake degradation composition in an amount in the range of from about 1% to about 75% by weight, and an initiator component present in the in-situ filter cake degradation composition in an amount in the range of from about 0.1% to about 4% by weight into a well bore in the subterranean formation; allowing the delayed-release acid component to release an acid; allowing the initiator component to interact with the released acid to produce an oxidizer; allowing the released acid to degrade at least a portion of the inorganic portion of the filter cake; and allowing the oxidizer to degrade at least a portion of the organic portion of the filter cake. 40. The method of claim 39 wherein the inorganic portion of the filter cake comprises at least one component selected from the group consisting of: calcium carbonate, a chemically bonded ceramic bridging agent, a magnesium compound, and any derivative thereof. 41. The method of claim 39 wherein the organic portion of the filter cake comprises at least one component selected from the group consisting of: a biopolymer, cellulose, a cellulose derivative, guar, a guar derivative, starch, a starch ether derivative, and any mixture thereof. 42. The method of claim 39 wherein the initiator component comprises lactate oxidase, or a derivative thereof. 43. The method of claim 39 wherein the delayed-release acid component further comprises at least one component selected from the group consisting of: an ester; an aliphatic polyester; a lactide; a poly(lactide); a glycolide; a poly(glycolide); a lactone; a poly(ε-caprolactone); a poly(hydroxybutyrate); an anhydride; a poly(anhydride); a poly(amino acid); and any derivative thereof. 44. The method of claim 39 wherein the delayed-release acid component further comprises an esterase enzyme, or a derivative thereof. 45. The method of claim 39 wherein the delayed-release acid component further comprises a poly(lactic acid). 46. The method of claim 39 wherein the filter cake is formed from a well drill-in and servicing fluid. 47. The method of claim 39 wherein the initiator component comprises lactate oxidase, or a derivative thereof, the delayed-release acid component further comprises poly(lactic acid), and the released acid comprises lactic acid.