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:
Jun. 23, 1992
Filed:
Jul. 26, 1991
Donald S Grosso, West Hartford, CT (US);
Teleco Oilfield Services Inc., Meriden, CT (US);
Abstract
An apparatus and method for selecting a passband frequency for acoustically transmitting signals over a drillstring is presented. In accordance with the present invention, a series of electrical signals, each progressively increasing in frequency over a predetermined range, excite an acoustic transmitter producing an acoustic signal in the drillstring. The power spectral density of this signal is measured and correlated to a modeled power spectral density for the drillstring. A passband frequency having the strongest correlation ratio between the measured and modeled power spectral density is selected as the frequency for acoustical communication in the drillstring.