Method of efficient drawdown and buildup testing of a completed producing well
CA 2235970 C · Owner: Zitterich, Craig L. · Inventors: Bohan, William L.; Beck, Harold K.; Schultz, Roger L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of efficient drawdown and buildup testing of a completed producing well, the well having therein a production tubing string through which well fluids are produced from a subsurface formation intersected by the well. The method comprises providing in the production tubing string an automatically controlled shut-in tool for controlling flow of well fluid up through the production tubing string; shutting in the well by closing the shut-in tool; monitoring a downhole parameter; sensing when the downhole parameter has achieved a criteria; generating a command signal in response to the sensing step; and automatically opening the shut-in tool in response to the command signal.
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 13, 1993 and granted September 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 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.