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US 8,575,938 B2Granted
Electrical power system for towed electromagnetic survey streamers
AssigneePGS Geophysical AS
InventorsKenneth Karlsen, Ulf Peter Lindqvist
Life of this patent
Estimating the term…
Abstract
A marine electromagnetic receiver cable includes a plurality of signal processing modules disposed at spaced apart locations along the receiver cable. A power supply line is connected to each of the signal processing modules and to an electric current source. A current regulation device is connected in the power supply line proximate each signal processing module. The current regulation devices are connected such that an amount of current flowing through the power supply line is substantially constant. At least one electromagnetic receiver is functionally coupled to an input of each signal processing module.
Claims22
A marine electromagnetic receiver cable, comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a current regulation device connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- at least one electromagnetic receiver functionally coupled to an input of each signal processing module.
2 more elements
A method for marine electromagnetic surveying, comprising:
- towing an electromagnetic field transmitter in a body of water;
- towing at least one electromagnetic receiver streamer cable in the water, the streamer cable comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a current regulation device connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- at least one electromagnetic receiver functionally coupled to an input of each signal processing module;
- actuating the electromagnetic field transmitter at selected times;
- and
- communicating signals detected by the electromagnetic receivers to a recording system.
7 more elements
A marine electromagnetic survey system comprising:
- an electric current source disposed on a survey vessel;
- at least one marine electromagnetic receiver cable connected to the survey vessel, each receiver cable comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and to the electric current source;
- a current regulation device connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- at least one electromagnetic receiver functionally coupled to an input of each signal processing module.
4 more elements
A marine electromagnetic receiver cable, comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a reverse biased zener diode connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- at least one electromagnetic receiver functionally coupled to an input of each signal processing module.
2 more elements
A marine electromagnetic receiver cable, comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a power shunt regulator connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- at least one electromagnetic receiver functionally coupled to an input of each signal processing module.
2 more elements
A method for marine electromagnetic surveying, comprising:
- towing an electromagnetic field transmitter in a body of water;
- towing at least one electromagnetic receiver streamer cable in the water, the streamer cable comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a reverse biased zener diode connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- communicating signals detected by the electromagnetic receivers to a recording system.
4 more elements
A method for marine electromagnetic surveying, comprising:
- towing an electromagnetic field transmitter in a body of water;
- towing at least one electromagnetic receiver streamer cable in the water, the streamer cable comprising:
- one or more signal processing modules disposed at spaced apart locations along the receiver cable;
- a single power supply line connected to each of the signal processing modules and configured to be connected to an electric current source;
- a power shunt regulator connected in the power supply line proximate each signal processing module such that an amount of current flowing through the power supply line is substantially constant;
- and
- communicating signals detected by the electromagnetic receivers to a recording system.
4 more elements
Dependencies are inferred from the claim text.