Communications – electrical: acoustic wave systems and devices – Wellbore telemetering
Patent
1981-06-29
1986-04-22
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
324375, 340853, 340856, G01V 140, G01V 302
Patent
active
045846758
ABSTRACT:
Discloses a two-way telemetry system and method for transmitting data taken at the bottom of a well bore to the earth's surface with one part of the telemetry circuit being the metallic drilling string and with another part of the telemetry circuit being a large volume of the earth formation surrounding the well bore between the drill bit and the earth's surface. Basic method includes the steps of generating electrical power within the drill pipe responsive to fluids pumped through the drill pipe, generating intermittant bursts of a first voltage representing a digital signal with the repitition function of the digital signal being regulated by a measured parameter, passing a first "focussed" current impressed by the first voltage from a first "composite" electrode radially outward and laterally away from the well bore to form one path of the current being the drill pipe, and receiving and detecting such first voltage potential resulting from the first Ac current with a receiver/detection means connected to the drill pipe and to a receiver electrode located remote from the drilling string and electrically connected into the earth formation. A control signal may be impressed in reverse order through the respective successive electrodes to be received at the bottom of the bore to switch and/or calibrate apparatus located at the bottom.
REFERENCES:
patent: 3462679 (1969-08-01), Attadi
patent: 3831138 (1974-08-01), Rammner
patent: 3889228 (1975-06-01), Shawhan
patent: 4015234 (1977-03-01), Krebs
patent: 4057781 (1977-11-01), Scherbatskoy
patent: 4087740 (1978-05-01), Suau
patent: 4087781 (1978-05-01), Grossi et al.
patent: 4181014 (1980-01-01), Zuvela et al.
"Second Generation MWD Tool, " Oil and Gas Journal, Feb. 21, 1983, pp. 84-90.
"Borehole Telemetry System is Key to Continuous Down-hole Drilling Measurements," Oil and Gas Journal Sep. 15, 1975, pp. 111-118.
Bradley James E.
Lobo Ian J.
Moskowitz Nelson
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