Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow
Patent
1981-09-15
1983-09-20
Pate, III, William F.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Measuring or indicating drilling fluid rate of flow
251137, E21B 4700
Patent
active
044050216
ABSTRACT:
A monostable, solenoid-operated valve in a passage which bypasses the drilling fluid pressure drop across a drill bit at the lower end of a drill string in a well opens and closes in response to downhole conditions to create pressure pulses in the drilling fluid. The valve is urged toward a closed position by drilling fluid pumped through the drill string. A larger force is required to open the valve than to hold it open. Current supplied to the solenoid to open the valve is thereafter reduced to a value sufficient to hold the valve open. The solenoid is de-energized to close the valve.
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Oil & Gas Journal, Jun. 12, 1978, p. 71, "Negative Pressure Pulse in MWD".
Oil & Gas Journal, Mar. 17, 1980, pp. 126-148, "MWD Update: New Systems Operating".
Exploration Logging, Inc.
Pate III William F.
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