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:
Nov. 04, 2008
Filed:
Oct. 22, 2003
John Freer, Peterhead, GB;
Mark Mccorry, Aberdeen, GB;
Alex Watt, Fraserburgh, GB;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
At least one three phase driven pumps () in a hydrocarbon well () well bore () uses frequency shift keyed digital signals () to pass instructions from a surface station () to a tool () and reports from a tool () to the surface station () in common mode through the three phase cables () using a star point () of the three phase cables () after each pump as the signal transmission and reception point and as the point for coupling a DC Power supply (), also provided in common mode on the three phase cables (), to the down hole electronic equipment (). The surface equipment () and the tool () use as a common ground. The digital messages comprises an address portion () identifying either the tool () for which an instruction () is destined or the tool () from which a report (also) originates. The digital message () also comprises a checksum () for error identification and correction.