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:
Feb. 23, 1993
Filed:
Nov. 01, 1991
Frank A Innes, Bieldside, GB;
Halliburton Logging Services, Inc., Houston, TX (US);
Abstract
A downhole tool for generating pressure pulses in a drilling fluid comprising an elongated body and a plurality of blades spaced around the body. The blades are each divided into an independent front section and rear section, forming a set of front sections and a set of rear sections, at least one of the set of front sections and the set of rear sections being mounted for rotation such that the front and rear sections are angularly displaceable relative to each other between a first position in which the sections are aligned and a second position in which the rear sections obstruct fluid flow between the front sections to generate a pressure pulse. The tool includes a means for generating a torque on the blade sections, and an escapement means which is radially movable to permit stepwise rotation of the blade sections, and thus to move the blade sections between the first and second positions. Each successive rotation of one of said sets of blade sections relative to the other of said sets of blade sections occurs in the opposite direction to the immediately preceding stepwise rotation of the said one set of blade sections relative to the said other set of blade sections.