Communications: electrical – Selective – Interrogation response
Patent
1975-04-03
1977-03-29
Birmiel, Howard A.
Communications: electrical
Selective
Interrogation response
325 28, 340 18LD, G01V 140, H04B 1302
Patent
active
040152340
ABSTRACT:
Apparatus for transmitting measurement information from a deep well being drilled to the surface comprises a receiving unit aboveground and a transmitting unit on a connecting section of the drill rod just above the drill bit. The transmitting unit comprises two spaced electrodes encircling the connecting section of the drill rod, means for connecting the electrodes to the terminals of a capacitor, an electrical source for charging the capacitor and a short circuiting switch for intermittently short circuiting the capacitor under control of one or another transducing elements for sensing the values to be measured e.g. the inclination of the bore, the direction of the inclination, the orientation of a directional drilling tool and temperature in the bore. The resulting coded energy pulses are transmitted through the earth to the receiving unit comprising an amplifying receiver connected to two spaced electrodes driven into the earth. Selection of the measurement to be transmitted is controlled by an aboveground control transmitter likewise employing the short circuiting of a capacitor connected to spaced electrodes in the ground. A change-over switch in the underground unit alternately connects the electrodes of the underground unit to a receiving circuit for receiving control signals from the aboveground control transmitter in order to select the measurement to be transmitted, and then to the capacitor for transmitting the selected measurement.
REFERENCES:
patent: 3150321 (1964-09-01), Summers
patent: 3186222 (1965-06-01), Martin
patent: 3315224 (1967-04-01), Ferguson
patent: 3333239 (1967-07-01), Silverman
patent: 3831138 (1974-08-01), Rammner
patent: 3878790 (1975-04-01), Meyer
Adams Bruce L.
Birmiel Howard A.
Burns Robert E.
Lobato Emmanuel J.
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