E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 29/00 (2006.01) E21B 7/20 (2006.01) E21B 21/10 (2006.01) E21B 23/00 (2006.01) E21B 33/14 (2006.01) E21B 41/00 (2006.01) E21B 43/00 (2006.01) E21B 43/10 (2006.01)
Patent
CA 2273568
The invention relates to a method of installing a casing section in a well, by means of first and second connection means arranged on a tubular lowering means, the first connection means being connected at an upper end of the casing section and the second connection means being connected at a lower end of the casing section, the tubular lowering means extending through the casing section. First and second flow paths are provided to enable fluids from the well to pass through the inside of the casing, as the casing is lowered into the well. A hollow is provided through the second connection means connecting the inside of the tubular lowering means to the outside of the casing. A lockable non return valve is provided in the hollow which permits the well fluids to flow from inside the internal bore of the tubular lowering means to the well outside the section being installed, and also permitting fluids to flow from the well to the inside of the tubular lowering means and thus back to surface. When the casing to be fitted has been lowered to its installed position the lockable return valve is unlocked thus operating as a conventional non return valve and preventing the unwanted flow of fluids up the internal bore of the section being installed.
Gowling Lafleur Henderson Llp
Head Philip
Xl Technology Limited
LandOfFree
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