Monitoring and pump-off control with downhole pump cards
CA 2094479 C · Owner: Lufkin Industries, Inc. · Inventors: Gibbs, Sam Gavin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for monitoring a rod pumped well to detect various problems, i.e. fluid pound, rod parts pump problems, high, fluid levels, imbalance of the pumping unit rate of production and, others. The method utilizes measurements made at the surface to calculate a downhole pump card. The method utilizes the downhole pump card to detect the various pump problems and control the pumping unit.
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 April 20, 1993 and granted January 14, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2015.
- 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.