Fracture monitoring using pressure-frequency analysis
CA 2440247 C · Owner: Surjaatmadja, Jim B. · Inventors: Stephenson, Stanley V.; Surjaatmadja, Jim B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Changes occurring downhole during a fracturing process can create or reflect pressure signals. Capturing and evaluating such pressure waves during fracturing enables personnel to monitor in real time or later, what happens downhole. When a fracture extends a burst of acoustic noise is embodied in a pressure wave or signal as is noise coming from other sources. By transforming time-based pressure signals to a frequency base one can monitor this acoustic noise. In a particular implementation a waterfall plot of frequency spectra at successive time slices of the original signal is used to determine frequency ridges such as a ridge of decreasing frequencies indicates fracture extension and a …
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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 September 9, 2003 and granted December 3, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2025.
- 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.