Adjustable shear valve mud pulser and controls therefor

Details Adjustable shear valve mud pulser and controls therefor Adjustable shear valve mud pulser and controls therefor

2004-10-22

2009-10-27

Edwards, Jr., Timothy (Department: 2612)

Communications: electrical

Wellbore telemetering or control

Including particular sensor

C340S853300, C340S854300, C367S084000, C367S085000, C181S102000

Reissue Patent

active

RE040944

ABSTRACT:
A telemetry system involving a shear-type mud pulser valve as the preferred embodiment is described. The control system includes a motor driver for the mud pulser which, in essence, moves one movable plate with respect to a stationary plate to create openings of various sizes. Pressure is sensed uphole of the pulser valve and is compared in real time to the desired pressure pulse amplitude. By allowing different relative rotational positions of the rotatable plate with respect to the stationary plate, different amplitudes can be achieved to further enhance the transmission of data to the surface. The control system compensates for wear in the mud pulser valve itself as well as drastic changes in mud flow and pressure. The configuration is simple and not prone to fouling from grit or other particles in the mud. The system is capable of creating an initial baseline array of a variety of pulse amplitudes, and thereafter providing the required relative rotation between the stationary and rotatable plates so as to be able to duplicate the baseline pulse amplitudes despite changes in the valve condition or in the flowing conditions of the mud.

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Improvements in MWD Telemetry: “The Right Data at the Right Time,” B.A. Montaron, J-M.D. Hache, and Bernard Voisin, Anadrill/Schlumberger, SPE 25356, paper prepared for presentation at the SPE Asia Pacific Oil & Gas Conference & Exhibition held in Singapore, Feb. 8-10, 1993.

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