Downhole tool

Details Downhole tool Downhole tool

1991-03-22

1992-06-02

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

G01V 140

Patent

active

051193442

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.

REFERENCES:
patent: Re30055 (1979-07-01), Claycomb
patent: 4785300 (1988-11-01), Chin et al.
patent: 4847815 (1989-07-01), Malone
patent: 4914637 (1990-04-01), Goodsman
patent: 4956823 (1990-09-01), Russell et al.

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