Downhole electromagnetic seismic source
CA 1293556 C · Owner: Chevron Research And Technology Company · Inventors: Paulsson, Bjorn N.P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a downhole seismic source capable of generating seismic forces in excess of 1000 newtons. The source produces seismic waves for seismic applications particularly cross borehole measurements and vertical seismic profiling. Coupled with motion sensing devices the present invention also performs as a seismic logging tool. The source is comprised of an outer housing a means, for clamping the source securely to the wellbore and a, linear electromagnetic actuator which utilizes permanent magnetic material having remanent magnetic field exceeding about .9 T such as rare earth permanent magnetics. The source has a diameter of about 12.5 cm to fit within a typical wellbore …
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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
- Granted December 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2008.
- 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.