E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 19/22 (2006.01) E21B 17/00 (2006.01) E21B 21/00 (2006.01) E21B 21/10 (2006.01) E21B 23/00 (2006.01) E21B 33/14 (2006.01) E21B 33/16 (2006.01) E21B 43/10 (2006.01)
Patent
CA 2200413
A method of providing a casing in a well is disclosed in which casing comprising a series of casing sections, the first section of which is provided from the top of the well and the subsequent sections arranged progressively downwards therefrom, are lowered into the well sequentially by a suitable lowering means such as a coiled tubing runner. Well fluids which are displaced by the lowering of the subsequent sections and the lowering means pass from the lower portion of the well up through the internal bore of the sections. The displaced fluids pass out from the internal bore of the lowering means into an outside annulus between the lowering means and existing casing sections through radial closable openings or side valves. A lockable non return valve, provided at the lower end of the section to be fitted, normally permits flow downwardly out of the casing and prevents flow upwardly into the casing, but may be optionally arranged in a locked open position to permit the well fluids to flow inside the internal bore of the sections to be fitted. The invention also relates to a lowering tool which enables the casing sections to be lowered and permits the well fluids to flow out into the adjoining channel.
Gowling Lafleur Henderson Llp
Head Philip
Xl Technology Limited
LandOfFree
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