Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1984-03-30
1986-12-16
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
166374, H04H 900, E21B 3410
Patent
active
046302441
ABSTRACT:
A mud pulse telemetry system for imparting data pulses to drilling fluids circulating in a drill string including an improved valve arrangment for modulating the pressure of the circulating drilling fluid is disclosed. A rotary acting shear-type valve is arranged in a through conduit configuration so that the seat face of the valve is covered when the valve is in an open position, thus preventing impingement of abrasive fluid particles on the valve seat face during the open flow position of the valve. The rotatable gate is positively driven through an arc in opposite directions by rotary solenoids so that a gate aperture is moved into and out of axial alignment with the opening in the valve seat to generate the pressure pulse. The rotary solenoid valve also permits a tailoring of the force curve of the solenoid for maximum power in actuation of larger flow orifices. The larger flow orifice permits generation of pressure pulses of increased amplitude.
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Jordan Charles T.
NL Industries Inc.
Steinberger Brian S.
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