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:
Jul. 28, 2020
Filed:
Aug. 17, 2018
Ulterra Drilling Technologies, L.p., Fort Worth, TX (US);
Matthew B. Roseman, Fort Worth, TX (US);
Christopher M. Casad, Benbrook, TX (US);
Thomas A. Damian, Dallas, TX (US);
Jason C. Maw, Beaumont Alberta, CA;
Ulterra Drilling Technologies, L.P., Fort Worth, TX (US);
Abstract
A downhole tool for cyclically generating cyclical pressure waves in drilling fluids of sufficient magnitude to vibrate a drill string or coiled tubing to reduce friction between drill string or coiled tubing and a wall of an uncased or cased wellbore. A passageway through which drilling fluid flows through the tool is constricted to increase pressure of the drilling fluid while it continues to flow through the tool. A bypass around the constriction is cyclically opened by a rotary valve to increase the flow area through the tool for the drilling fluid while at the same time an axially shifting valve, shifted by a pair of rotating cams, opens to allow drilling fluid to vent to an annulus formed by the drill string or coiled tubing and a wall of the wellbore.