Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent
1982-08-05
1984-06-12
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through well fluids
175 48, 175 50, G01V 140
Patent
active
044545983
ABSTRACT:
In the preferred and illustrated embodiment of the present apparatus, a drilling orientation tool is disclosed utilizing a mud pressure charging system where the pressure charge is converted into hydraulic oil pressure. The hydraulic oil flow is supplied to a four-way, three-position, solenoid operated valve having a closed center position, the valve forming a control signal delivered to an adjustable constriction in the mud flow path through the tool. Variables are encoded dependent on opening and closing of the constriction. Consecutive variables are transmitted in the form of fine and coarse measures. The electrically operated solenoid valve thus encodes two or more variables for transmission to the surface by detecting mud pressure variations in the mud flow line at the surface.
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Dresser Industries Inc.
Moskowitz Nelson
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