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A method of installing a liner in a drilled bore below a section of bore previously lined with casing comprises the steps of: running a length of liner into the bore such that at least an upper end of the liner is positioned in overlapping relation with at least a lower end of the casing; and plasti

A method of installing a liner in a drilled bore below a section of bore previously lined with casing comprises the steps of: running a length of liner into the bore such that at least an upper end of the liner is positioned in overlapping relation with at least a lower end of the casing; and plastically deforming a portion of the liner such that an external face of the portion forms an interference fit with an internal face of a portion of the casing. The interference fit preferably provides both hanging support for the liner and a fluid-tight seal between the liner and casing.

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1. A method of installing a liner in a drilled bore lined with casing, comprising:running the liner into the bore such that the liner is positioned in an at least partially overlapping relation with the casing;deforming the casing to define an enlarged inner diameter portion prior to running the lin

1. A method of installing a liner in a drilled bore lined with casing, comprising:running the liner into the bore such that the liner is positioned in an at least partially overlapping relation with the casing;deforming the casing to define an enlarged inner diameter portion prior to running the liner into the bore; andplastically deforming a portion of the liner to expand the portion of the liner into the overlapping casing resulting in a subsequent increase in inner and outer diameters of the liner and a corresponding increase in diameter of the casing.2. The method of claim 1, wherein the portion of liner is deformed to create a pressure-tight seal between the liner and casing.3. The method of claim 2, wherein the seal formed is a metal-to-metal seal.4. The method of claim 1, further comprising:further expanding the portion of the liner so as to radially deform a portion of the overlapping casing adjacent to the expanded portion of liner.5. The method of claim 4, wherein deformation of the portion of the casing is plastic deformation.6. The method of claim 4, wherein deformation of the portion of the casing is elastic deformation.7. The method of claim 1, wherein the liner is initially secured relative to the casing by deforming the liner by radially extending circumferentially spaced areas of the liner to form corresponding areas of interference fit between the liner and the casing.8. The method of claim 1, further comprising:cementing the liner in the bore.9. The method of claim 8, wherein the step of cementing is achieved by:pumping cement from a surface to the lower end of the liner,directing the cement into the annulus between the liner and the bore wall, and displacing fluid from the annulus.10. The method of claim 9, wherein the portion of the liner is expanded once the cement is in place in the annulus.11. A method of installing a liner in a drilled bore lined with casing, comprising:running the liner into the bore such that the liner is positioned in an at least partially overlapping relation with the casing;plastically deforming a portion of the liner to expand the portion of the liner into the overlapping casing resulting in a subsequent increase in inner and outer diameters of the liner and a corresponding increase in diameter of the casing, wherein the portion of liner is deformed to create a pressure-tight seal between the liner and casing; andproviding a portion of liner to be expanded with a band of relatively soft metal which is plastically deformed during the expansion of the liner portion.12. A method of installing a liner in a drilled bore lined with casing, comprising:running the liner into the bore such that the liner is positioned in an at least partially overlapping relation with the casing; andplastically deforming a portion of the liner to expand the portion of the liner into the overlapping casing resulting in a subsequent increase in inner and outer diameters of the liner; andcementing the liner in the bore, the cementing comprising:pumping cement from a surface to the lower end of the liner;directing the cement into the annulus between the liner and the bore wall;displacing fluid from the annulus; androtating the liner as the cement is passed into the annulus,wherein the portion of the liner is expanded once the cement is in place in the annulus.13. A method of installing a liner in a drilled bore lined with casing, comprising:running the liner into the bore such that the liner is positioned in an at least partially overlapping relation with the casing; andplastically deforming portion of the liner to expand the portion of the liner into the overlapping casing resulting in a subsequent increase in inner and outer diameters of the liner,wherein the liner is run into the bore on a running tool carrying an expander including a body and at least one radially extendable member mounted thereon, the running tool being rotatable to move the member around the portion of the liner to create the desired deformed portion.