Downhole telemetry signalling apparatus
First Claim
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1. A method of transmitting well-bore down hole data comprising using a well-bore downhole data logging signal transmission apparatus to transmit data from a signal transmitter to a receiver,the signal transmission apparatus having a signal transmitter sub mounted to an electrically conductive drill string adjacent to a drill bit thereof;
- a receiver mounted at a drill bore head location;
said signal transmitter sub including a signal transmitter;
said signal transmitter being operatively connected to place coded electrical signals on the electrically conductive drill string;
said receiver mounted in operative connection to sense the presence of the transmitted coded electrical signals; and
said signal transmission apparatus being operable to cause pulses of charge to be placed on the drill string, said pulses having a duration of less than 10 ms; and
the pulses have an initial peak voltage, and said method includes spacing pulses of data, said spacing including inhibiting transmission of a subsequent pulse until electrical voltage potential on said drill string adjacent to said signal transmitter has decayed to less than 37% of said peak voltage.
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Abstract
A well-bore downhole data logging signal transmission apparatus having: a signal transmitter at a drill bit on a drill string; a receiver at a drill bore head, a generator places a carrier current on the drill string with the drill bit; the transmitter places signal pulses; the receiver senses the pulses; the pulses have a duration less than 10 ms.
21 Citations
21 Claims
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1. A method of transmitting well-bore down hole data comprising using a well-bore downhole data logging signal transmission apparatus to transmit data from a signal transmitter to a receiver,
the signal transmission apparatus having a signal transmitter sub mounted to an electrically conductive drill string adjacent to a drill bit thereof; -
a receiver mounted at a drill bore head location; said signal transmitter sub including a signal transmitter; said signal transmitter being operatively connected to place coded electrical signals on the electrically conductive drill string; said receiver mounted in operative connection to sense the presence of the transmitted coded electrical signals; and said signal transmission apparatus being operable to cause pulses of charge to be placed on the drill string, said pulses having a duration of less than 10 ms; and the pulses have an initial peak voltage, and said method includes spacing pulses of data, said spacing including inhibiting transmission of a subsequent pulse until electrical voltage potential on said drill string adjacent to said signal transmitter has decayed to less than 37% of said peak voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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- 15. A downhole telemetry apparatus that includes a signal source connected to place a series of controlled duration electrical charge pulses on a drill string, and apparatus mounted to detect ringing in the drill string caused by such pulses.
Specification