Blowout preventer protector and method of using same during oil and gas well stimulation
CA 2178856 C · Owner: Dallas, L. Murray · Inventors: Dallas, L. Murray
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for protecting blowout preventers during well fracturing and/or stimulation procedures is disclosed. The apparatus includes a hollow spool, with spaced-apart inner and outer sidewalk that define an annular cavity. A mandrel, is reciprocally movable in the cavity. The apparatus is mounted above a BOP attached to a casing of the well before well stimulation procedures are begun. The, mandrel is stroked down through the BOP to protect it from direct contact with the, well stimulation fluids, especially abrasive proppants. The advantage is a simple, easy to operate apparatus for protecting BOPS which provides full access to the well, casing with well servicing tools to …
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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 12, 1996 and granted March 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 12, 2018.
- 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.