Fluid pressure deactivated thru-tubing centralizer
CA 2206916 A1 · Owner: Braddick, Britt O. · Inventors: Saucier, David D.; Braddick, Britt O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thru-tubing centralizer 10, 102 positioned along a tubular T after passing through a small diameter tubing string T S centralizes the tubular within a large diameter casing string C S. The centralizer includes a body 12 112 having a, throughbore 14 for transmitting fluid through the centralizer such that a drill motor, M and rotatable bit B may be suspended from the tubular T below the centralizer.The centralizer includes a piston 20 136 and arm support sleeve 30, 130 each movable axially between a set position and a released position in response to increased fluid pressure in the throughbore of the centralizer body. The compression spring 40, 156 biases an arm support sleeve to a set …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 3, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.