Method and apparatus for transmitting information in a borehole

Details Method and apparatus for transmitting information in a borehole Method and apparatus for transmitting information in a borehole

1990-06-13

1992-01-07

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

367 83, G01V 140

Patent

active

050797506

ABSTRACT:
An apparatus for transmitting data to the surface of the earth in a borehole having a tubular drill string for circulating drilling fluid between the surface of the earth and downhole including a signal generator for providing electrical signals indicating a measured downhole condition, a valve within the apparatus moveable between a closed and an open condition for controlling, at least in part, the flow of drilling fluid, the valve being moved from closed toward open condition by the application of a first force, such as of a solenoid, and sequentially by a second force, such as a hydraulic fluid pressure differential across a piston to rapidly move the valve to the open condition, thereby creating a negative pressure pulse in the drilling fluid which pressure pulse is receivable at the earth's surface. In the preferred arrangement the fluid passageway within the apparatus includes an orifice for creating a lower pressure zone, the pressure of this zone being utilized to create a differential pressure across a piston to supply the secondary force for moving the valve towards the open condition.

REFERENCES:
patent: 3736558 (1973-05-01), Cubberly, Jr.
patent: 3737843 (1973-06-01), Le Peuvedic et al.
patent: 3964556 (1976-06-01), Gearhart et al.
patent: 4027282 (1977-05-01), Jeter
patent: 4078620 (1978-05-01), Westlake et al.
patent: 4771408 (1988-09-01), Kotlyar

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