Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent
1974-10-02
1978-10-17
Stephan, Steven L.
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
175 45, E21B 47022
Patent
active
041200977
ABSTRACT:
Apparatus is provided for use attached to a pipe string in a well drilling, service or servicing operation to create a signal in a fluid stream flowing in the pipe string and in material of the pipe string in response to indications of down hole sensors. The signal created consists of brief pulses created down hole and detectable at the earth surface as pressure changes in fluid flowing in the pipe string. Alternately, periodic bursts of higher frequency stress variations in the pipe string walls are transmitted as pulses. The repetition rate of the pulses varies over a preselected range as the down hole sensor output changes over a preselected range. The transmitter, which may be lowered and recovered through the pipe string bore, derives its power from the fluid pressure differential used to create pressure pulses. The pulse repetition rate variation dictated by a sensor output is controlled without taking energy from the sensor.
REFERENCES:
patent: 3077233 (1963-02-01), Armstrong
patent: 3384750 (1968-05-01), Owen
patent: 3581404 (1971-06-01), Sanfead
patent: 3710448 (1973-01-01), Kimmel et al.
patent: 3737843 (1973-06-01), Peuvedic et al.
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