Tubing anchor

The method of any of the preceding claims, comprising forming the first tubing section by:

• providing tubing having a substantially circular section wall;
• reconfiguring portions of the tubing wall to a generally planar form such that the tubing is then substantially polygonal, and then
• further reconfiguring the planar tubing wall portions to form convex wall portions, located between outer surface portions.

Expandable downhole tubing including a tubing section with a non-circular wall configured to provide an outer surface portion describing a running-in diameter less than a predetermined first diameter, the tubing section being diametrically expandable such that said outer surface portion describes a diameter greater than said first diameter, and the expanded tubing section being at least partially elastically deformable on application of a restraining force such that said outer surface portion describes a restrained diameter corresponding to said first diameter.

A method of forming tubing having a section with a wall configured to provide outer surface portions describing a diameter less than a selected first diameter, comprising:

• providing circular section tubing having an outer diameter at least as large as the first diameter;
• reconfiguring portions of the initially circular tubing wall to a generally planar form such that the tubing is then substantially polygonal, and then
• further reconfiguring the planar tubing wall portions to form convex wall portions, located between outer surface portions.

A method of forming tubing having a section with a wall configured to provide an outer surface portion describing a diameter less than a selected first diameter, comprising:

• providing circular section tubing having an outer diameter at least as large as the first diameter, and
• forming at least one indent in the tubing wall to create at least one convex wall portion such that the tubing defines an outer diameter less than said first diameter.

A method of anchoring tubing in a bore, the method comprising:

• providing tubing having a section configured to provide at least one outer surface portion describing an outer diameter greater than a first diameter;
• and
• locating the tubing within a section of a bore having an internal diameter corresponding to the first diameter such that the outer surface portion is restrained to the first diameter by the bore.

A method of anchoring tubing in a bore, the method comprising:

• providing tubing having a section describing an outer diameter greater than a first diameter;
• and
• locating the tubing within a section of a bore having at least one inner surface portion describing an internal diameter corresponding to the first diameter such that the inner surface portion engages with the tubing.

Tubing adapted for anchoring in a section of a bore of a first diameter, the tubing including a section with a non-circular wall configured to provide an outer surface portion describing a diameter less than the first diameter and adapted to be diametrically expanded such that the outer surface portion describes a diameter greater than the first diameter.

Tubing adapted for anchoring in a section of a bore of a first diameter, the tubing including a section with a non-circular wall configured to provide an outer surface portion describing a diameter greater than the first diameter and adapted to be elastically deformed to the first diameter.