Drill string telemetry
AssigneeCryoton (UK) Limited
InventorsDareyoush Rassi, Yuri Zhuravlev
Life of this patent
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Abstract
A telemetry transmitter located in a portion of a drill string comprises an input for receiving and transmitting data obtained from at least one transducer arranged to sense a parameter of the drill string and/or a parameter of the surrounding medium. The transmitter comprises a magnetic dipole arranged to transmit an electromagnetic data signal, a current dipole arranged to transmit an electromagnetic data signal and control means for adaptively varying the power output from the magnetic and current dipoles, according to the orientation of the portion of the drill string containing the transmitter and according to the electrical resistivity of the medium surrounding the portion of the drill string containing the transmitter.
Claims19
A method of transmitting an electromagnetic signal containing data obtained from at least one transducer in a drill string, the method comprising:
- sensing the orientation of the drill string and/or the electrical resistivity of the medium surrounding the portion of the drill string containing a transmitter and outputting a signal;
- supplying power to the transmitter located in the portion of the drill string, the transmitter containing a magnetic and a current dipole;
- and
- controlling the power output by the magnetic and the current dipoles to optimize the transmission of data from the transducer based on the signal.
A drill string telemetry transmitter located in a portion of a drill string, the transmitter comprising an input for receiving data obtained from at least one transducer arranged to sense a parameter of the drill string and/or a parameter of the surrounding medium, a magnetic dipole arranged to transmit an electromagnetic signal comprising said data, a current dipole arranged to transmit an electromagnetic signal comprising said data and control means for adaptively varying the power output by said magnetic and current dipoles, according to the orientation of said portion of the drill string and according to the electrical resistivity of the medium surrounding said portion of the drill string.
A drill string telemetry system comprising a first transmitter located in a lower portion of the drill string, said first transmitter comprising an input connected to at least one transducer arranged to sense a parameter of the drill string and/or a parameter of the surrounding medium, said transmitter being arranged to transmit data output from the transducers, a and a second transmitter located in an upper portion of the drill string, said second transmitter comprising a receiver arranged to receive the data transmitted by said first transmitter, a magnetic dipole arranged to transmit an electromagnetic signal comprising said data, a current dipole arranged to transmit an electromagnetic signal comprising said data and control means for adaptively varying the power output from said magnetic and current dipoles, according to the orientation of said upper portion of the drill string and according to the electrical resistivity of the medium surrounding said upper portion of the drill string.
Dependencies are inferred from the claim text.