Concentric tubing having bonded insulation with the annulus

Details Concentric tubing having bonded insulation with the annulus Concentric tubing having bonded insulation with the annulus

E - Fixed Constructions

21

B

25/126, 26/155,

E21B 17/00 (2006.01) E21B 36/00 (2006.01) F16L 59/15 (2006.01) F16L 59/21 (2006.01)

Patent

CA 1179939

ABSTRACT OF THE DISCLOSURE An insulated concentric tubing well element having an inner tubing and an outer tubing with a substan- tially solid insulating material in the annulus between the inner and outer tubing. A bonding material fills the voids in the annu?s and the surface of the solid insulating material. The bonding material prevents movement within the annulus and seals the annulus. Calcium silicote is disclosed as a suitable material for the solid insulation and sodium silicate is disclosed as the bonding material. A method is disclosed for producing the complete well element.

405145

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