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. 02, 1992
Filed:
Mar. 22, 1991
Frank A Innes, Aberdeen, GB;
Halliburton Logging Services, Inc., Houston, TX (US);
Abstract
A downhole MWD tool for generating pressure pulses in a drilling fluid comprises an elongate body for positioning in a drill collar and a plurality of blades spaced around the body. Each blade is divided into an independent front section and rear section one of the front and rear sections being mounted on a rotatable shaft such that the front and rear sections are angularly displaceable relative to one another between a first position in which the sections are aligned and a second position in which the rear blades obstruct fluid flow between the front sections to generate a pressure pulse. A hydraulic actuator is operable to rotate the shaft, and is powered by the pressure difference in the drilling fluid between an upstream end of the tool and a position downstream of the tool.