The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 2017
Filed:
Sep. 27, 2013
Applicant:
Rosemount Inc., Chanhassen, MN (US);
Inventors:
John Philip Miller, Ardmore, OK (US);
David Lyle Wehrs, Eden Prairie, MN (US);
Assignee:
Rosemount Inc., Chanhassen, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 47/09 (2012.01); E21B 47/06 (2012.01); E21B 43/12 (2006.01); E21B 47/00 (2012.01);
U.S. Cl.
CPC ...
E21B 47/09 (2013.01); E21B 43/121 (2013.01); E21B 47/0007 (2013.01); E21B 47/06 (2013.01);
Abstract
A system for detecting when a plunger reaches a bottom of a well includes a pressure sensor configured to measure a pressure of the well and provide a measured pressure output. Derivative calculation circuitry calculates a derivative of the measured pressure output. Detection circuitry detects when the plunger reaches the bottom of the well based upon the calculated derivative.