US 2010/0073190 A1 · Telemetry Method and System for Subsurface Well and Reservoir and Logging Data

Abstract

A method and system for transmitting data through a transmission medium between surface and subsurface transceivers. A surface transceiver and a subsurface transceiver are each configured to selectively transmit over a plurality of transmission channels, each transmission channel having a range of frequencies within the total frequency bandwidth. The surface transceiver is adapted to initialize a channel to determine at least one parameter affecting the current maximum data rate for transmission of information through the channel using a given transmission methodology. At least one of the channels uses carrierless phase/amplitude (CAP) modulation for its transmission methodology. The surface transceiver and the subsurface transceiver adapt to cooperatively periodically test a channel by transmission of a calibration signal from the subsurface transceiver to the surface transceiver. Control circuitry compares the received calibration signal with the calibration signal, responding to the result of the comparison to adjust at least one parameter as necessary to achieve an optimum rate of data transmission through said channel.

Claims13

Dependent claims

A method of transmitting data through a transmission medium for communication between surface and subsurface transceivers, comprising:

determining the total frequency bandwidth available for transmission of data through said transmission medium;
partitioning said total bandwidth into a plurality of separate channels each defined by respective upper and lower frequencies;
transmitting data on at least one of the separate channels using a given transmission methodology;
and
wherein said given transmission methodology comprises use of carrierless phase/amplitude (CAP) modulation on at least one of the separate channels.

2 more elements

A system for transmitting data through a transmission medium having a known total frequency bandwidth available for transmission, said system comprising:

a surface transceiver and a subsurface transceiver each configured to selectively transmit over a plurality of transmission channels, each said transmission channel comprising a range of frequencies within said total frequency bandwidth;
said surface transceiver adapted to initializing a channel to determine at least one parameter affecting the current maximum data rate for transmission of information through said channel using a given transmission methodology;
said surface transceiver and said subsurface transceiver adapted to cooperatively periodically test a channel by transmission of a calibration signal from said subsurface transceiver to said surface transceiver;
control circuitry for comparing said received calibration signal received at said surface transceiver with said transmitted calibration signal, said control circuitry being responsive to the result of said comparison to adjust said at least one parameter as necessary to achieve the maximum rate of data transmission through said channel;
and
wherein said given transmission methodology comprises use of carrierless phase/amplitude (CAP) modulation on at least one of said plurality of transmission channels.

3 more elements

Dependencies are inferred from the claim text.

Telemetry Method and System for Subsurface Well and Reservoir and Logging Data

Life of this patent

Telemetry Method and System for Subsurface Well and Reservoir and Logging Data

Life of this patent

Abstract

Claims13