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A method of lining a drilled bore comprises running a tubular into a drilled bore and then corrugating the tubular in the bore. The tubular may also be expanded in the bore. In other aspects of the invention the tubular is corrugated prior to running into the bore and may be rotated as it is run in

A method of lining a drilled bore comprises running a tubular into a drilled bore and then corrugating the tubular in the bore. The tubular may also be expanded in the bore. In other aspects of the invention the tubular is corrugated prior to running into the bore and may be rotated as it is run into the bore.

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The invention claimed is: 1. A method of lining a drilled bore, the method comprising: providing a tool having a radially extendable member; running a tubular into the drilled bore; and after running the tubular into the bore, forming one or more helical or solely circumferential, selected periodic

The invention claimed is: 1. A method of lining a drilled bore, the method comprising: providing a tool having a radially extendable member; running a tubular into the drilled bore; and after running the tubular into the bore, forming one or more helical or solely circumferential, selected periodic corrugations in at least a portion of a wall of the tubular using the radially extendable member, wherein the wall portion is diametrically expanded at peaks and troughs of the corrugations. 2. The method of claim 1, wherein the corrugations of the tubular increases the collapse resistance of the tubular. 3. The method of claim 1, wherein the tubular is a thin-walled tubular. 4. The method of claim 3, wherein the tubular has a wall thickness of less than 6 mm. 5. The method of claim 4, wherein the tubular has a wall thickness of around 3 to 4 mm. 6. The method of claim 1, wherein the tubular has a wall thickness of at least 6 mm. 7. The method of claim 1, wherein the tubular is run in through existing bore-lining tubing having an internal first diameter and the tubular is then expanded to an internal diameter at least as large as the first diameter. 8. The method of claim 1, wherein the tubular is corrugated from the top down. 9. The method of claim 1, wherein the tubular is corrugated from the bottom up. 10. The method of claim 1, wherein the tubular is expanded from the top down. 11. The method of claim 1, wherein the tubular is expanded from the bottom up. 12. The method of claim 1, further comprising the step of cementing the tubular in the bore. 13. The method of claim 1, wherein the tubular carries a deformable material on an external surface thereof. 14. The method of claim 1, wherein the tubular is provided in combination with a sleeve of deformable material. 15. The method of claim 1, wherein only a portion of the tubular is corrugated, retaining a section of cylindrical-walled tubular. 16. The method of claim 1, wherein all of the tubular is corrugated. 17. The method of claim 1, wherein the corrugations are solely circumferential. 18. The method of claim 1, wherein the corrugations are helical. 19. The method of claim 1, further comprising locating at least one further tubular internally of the corrugated tubular. 20. The method of claim 19, wherein the at least one further tubular has a cylindrical wall. 21. The method of claim 19, wherein the at least one further tubular is subsequently diametrically expanded. 22. The method of claim 1, further comprising locating the tool within the corrugated tubular. 23. The method of claim 1, wherein the tool is a rotary expander and forming the corrugations comprises rotating the rotary expander within the tubular and axially advancing the rotary expander through the tubular. 24. The method of claim 23, wherein the rotary expander is configured to create a single-start helical corrugation. 25. The method of claim 23, wherein the rotary expander is configured to create a multiple-start plurality of helical corrugations. 26. The method of claim 1, wherein the tubular is located to intersect a problem formation. 27. The method of claim 1, wherein the tubular is made from metal. 28. A method of lining a drilled bore, comprising: running a tubular into a drilled bore; diametrically expanding the tubular; and corrugating the tubular in the bore in a separate step from expanding, wherein the tubular is diametrically expanded before corrugation. 29. The method of claim 28, wherein the tubular is made from metal. 30. A method of lining a drilled bore, the method comprising: providing a tool having a radially extendable member; running a tubular into the drilled bore to intersect a problem formation; and after running the tubular into the bore, forming one or more helical or solely circumferential, selected periodic corrugations in a wall of the tubular using the radially extendable member, at least where the tubular intersects the problem formation, wherein the wall is diametrically expanded at peaks and troughs of the corrugations. 31. The method of claim 30, further comprising expanding at least a portion of the tubular separately from corrugating the tubular. 32. The method of claim 30, wherein the tubular is made from metal. 33. A method of forming a downhole tubular, comprising: providing a rotary expansion tool having a radially extendable member; and corrugating at least a portion of a cylindrical tubular by rotating the rotary expansion tool relative to the tubular to produce one or more helical or solely circumferential, selected periodic corrugations with the radially extendable member, wherein the tubular portion is diametrically expanded at peaks and troughs of the corrugations. 34. The method of claim 33, wherein the corrugations are helical and the tool is advanced axially relative to the tubular during corrugation. 35. The method of claim 33, wherein the tubular is made from metal. 36. A downhole tubular, comprising: a wall having one or more helical corrugations formed in both an inner surface and an outer surface of the wall; and an elongate element located in one or more troughs of the corrugations, wherein the wall is made from metal. 37. The tubular of claim 36, wherein the elongate element is a signal carrier. 38. The tubular of claim 36, wherein the elongate element is a conduit. 39. The tubular of claim 36, wherein the elongate element is a power carrier. 40. The tubular of claim 36, wherein a sensing element is located in the troughs of the corrugations. 41. The tubular of claim 36, wherein the elongate element is an optical fiber. 42. The method of claim 36, wherein the troughs are internal troughs. 43. The method of claim 36, wherein the troughs are external troughs. 44. A method of running tubing into a bore to minimize differential sticking, the method comprising: identifying whether elongate members located in a selected bore are likely to encounter differential sticking; providing corrugated tubing; and running the tubing into the bore. 45. The method of claim 44, further comprising cementing the tubing in the bore. 46. The method of claim 44, wherein the tubing is made from metal. 47. A method of running tubing into a bore, the method comprising: running a corrugated-wall tubular into the bore; rotating the tubular in the bore; and cementing the tubular in the bore. 48. The method of claim 47, wherein the tubular is a tubing string comprising a plurality of tubing sections joined by relatively rigid connectors. 49. The method claim 47, wherein the tubular is rotated to dislodge sediment in the bore. 50. The method of claim 47, further comprising drilling with a drill bit supported by the tubular. 51. The method of claim 47, wherein the tubular is rotated during cementing. 52. The method of claim 47, wherein the tubular is made from metal. 53. The method of claim 47, further comprising expanding the tubular. 54. A method of running tubing into a bore, the method comprising: running a tubular defining a helically corrugated configuration into the bore; and rotating the tubular in the bore to negotiate a tight spot in the bore, wherein the tubular is made from metal. 55. Downhole tubulars, each tubular comprising at least one corrugated end portion, whereby the tubulars are adapted to be coupled to one another by locating the corrugated end portion of one tubular within the corrugated end portion of another tubular, wherein the corrugations are helical and the tubulars are made from metal. 56. The tubulars of claim 55, wherein the corrugated end portions are parallel. 57. The tubulars of claim 55, wherein the corrugated end portions are tapered. 58. The tubulars of claim 55, wherein deformable sealing material is provided on the corrugated end portion of at least one of the tubulars. 59. A method of locating a tubular within a larger diameter bore, the method comprising: providing a corrugated tubular; locating the tubular in the larger diameter bore; and reducing a degree of tension applied to the tubular such that the tubular axially contracts and diametrically expands. 60. The method of claim 59, wherein the tubular is initially under tension. 61. The method of claim 59, wherein the degree of tension applied to the tubular is reduced by placing the tubular in compression. 62. The method of claim 59, wherein a degree of diametric expansion of the tubular is such that the tubular engages the surrounding bore wall. 63. The method of claim 59, wherein the tubular is made from metal. 64. Completion tubing having at least a portion of corrugated wall to accommodate a degree of at least one of axial compression and expansion in combination with a seal for locking a lower end of the tubing relative to surrounding bore-lining tubing. 65. The tubing of claim 64, wherein the completion tubing is made from metal. 66. The tubing of claim 64, wherein one or more corrugations of the wall are solely circumferential. 67. The tubing of claim 64, wherein one or more corrugations of the wall are helical. 68. The tubing of claim 64, wherein one or more corrugations of the wall have selected periods. 69. A method of lining a bore, the method comprising: diametrically expanding a wall of a helically or solely circumferentially corrugated tubular in the bore such that the wall is deformed about its entire circumference; and selecting at least one of a degree of expansion, an expansion method, and a degree of corrugation of the tubular such that the tubular both before and after the diametrically expanding has a length that is substantially unchanged. 70. The method of claim 69, wherein the tubular is made from metal. 71. A downhole tubular, comprising: a male helically corrugated first end portion adapted to be coupled to a female helically corrugated end portion of a substantially identical second downhole tubular; a female helically corrugated second end portion adapted to be coupled to a male helically corrugated end portion of the substantially identical second downhole tubular; and a body portion extending between the end portions, wherein the tubular is made from metal. 72. The tubular of claim 71, wherein the end portions of the tubular are parallel. 73. The tubular of claim 71, wherein the end portions of the tubular are tapered. 74. The tubular of claim 71, further comprising a deformable material disposed along an outer surface or within an inner surface of at least one of the end portions of the tubular to form a seal with a respective mating end portion of the second tubular. 75. The tubular of claim 71, wherein a wall of the body portion has one or more corrugations formed therein. 76. The tubular of claim 75, wherein the body corrugations are helical and further comprising an elongate element located in one or more troughs of the body corrugations. 77. The tubular of claim 76, wherein the elongate element is a signal carrier. 78. The tubular of claim 76, wherein the elongate element is a conduit. 79. The tubular of claim 76, wherein the elongate element is a power carrier. 80. The tubular of claim 76, wherein the elongate element is an optical fiber. 81. The tubular of claim 76, wherein the troughs are internal. 82. The tubular of claim 76, wherein the troughs are external. 83. The tubular of claim 76, wherein the corrugations are formed both in an inner surface and an outer surface of the wall. 84. The tubular of claim 76, wherein a thickness of the wall is substantially uniform. 85. The tubular of claim 76, further comprising a sensing element located in the troughs of the body corrugations. 86. The tubular of claim 75, further comprising sealing or filling material located in a trough of the body corrugations. 87. A method of lining a drilled bore, the method comprising: providing a tool having a radially extendable member; running a tubular into the drilled bore; and corrugating the tubular in the bore into selected periodic corrugations, each having a substantial circumferential component, wherein the tubular is diametrically expanded at the corrugations and between the corrugations by the radially extendable member configured to also provide the corrugations. 88. A method of lining a drilled bore, the method comprising: providing a tool having a radially extendable member; running a tubular into a drilled bore to intersect a problem formation; and corrugating the tubular in the bore into selected periodic corrugations at least where the tubular intersects the problem formation, each corrugation having a substantial circumferential component, wherein the tubular is diametrically expanded at the corrugations and between the corrugations with the radially extendable member configured to also form the corrugations. 89. A method of forming a downhole tubular, comprising: providing a rotary expansion tool having a radially extendable member; and corrugating a cylindrical tubular by rotating the rotary expansion tool relative to the tubular to produce selected periodic corrugations, each having a substantial circumferential component, wherein the tubular is diametrically expanded at the corrugations and between the corrugations by the radially extendable member configured to also form the corrugations. 90. A downhole tubular, comprising: a wall having one or more helical corrugations formed therein; and an elongate element located in one or more internal troughs of the corrugations, wherein: the wall is made from metal, and a wall thickness of a corrugated portion is the same as a wall thickness of an un-corrugated portion. 91. The tubular of claim 90, wherein the elongate element is a signal carrier. 92. The tubular of claim 90, wherein the elongate element is a conduit. 93. The tubular of claim 90, wherein the elongate element is a power carrier. 94. The tubular of claim 90, further comprising a sensing element located in the troughs of the corrugations. 95. The tubular of claim 90, wherein the elongate element is an optical fiber. 96. A downhole tubular, comprising: a wall having one or more helical corrugations formed therein; and an elongate element located in one or more troughs of the corrugations, wherein: the wall is made from metal, the wall has a substantially uniform thickness, and the troughs are internal troughs. 97. The tubular of claim 96, wherein the wall has a uniform thickness.