Electromagnetic survey system with multiple sources
AssigneeSchlumberger Technology Corporation
InventorsRansom Reddig, Philip Heelan
Life of this patent
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Abstract
Multiple sources are provided for a transmitter cable for use in electromagnetic surveying. The transmitter cable includes a dipole antenna comprising a pair of spaced apart electrodes mounted on their respective cables. Two antennas may be powered from each source. Alternatively, the outputs of each source are connected to a common antenna pair. A single large power supply may be mounted on a vessel to supply power through the tow cable. Alternatively, a number of power supplies may be provided aboard the vessel, with each power supply having dedicated conductors through the tow cable to power the plurality of current sources.
Claims25
An electromagnetic survey system comprising:
- a transmitter cable comprising:
- an antenna;
- and
- a plurality of current sources electrically coupled to the antenna;
- a source of electrical power for the current sources;
- a plurality of receivers;
- and
- means for towing the transmitter cable through water proximate the plurality of receivers.
An electromagnetic survey system, comprising:
- an antenna;
- a first current source coupled to the antenna;
- a second current source coupled to the antenna;
- a source of electrical power coupled to at least one of the first current source and the second current source;
- and
- a plurality of receivers positioned on a seafloor.
An electromagnetic survey system comprising:
- a source of electrical power;
- a first current source coupled to the source of electrical power;
- a second current source coupled to the source of electrical power;
- a first antenna coupled to the first current source, wherein the first current source is to provide an output of a first frequency;
- and
- a second antenna coupled to the second current source, wherein the second current source is to provide an output of a second, different frequency.
An electromagnetic survey system comprising:
- a source of electrical power;
- a first current source coupled to the source of electrical power;
- a second current source coupled to the source of electrical power;
- a first antenna coupled to the first current source;
- a second antenna coupled to the second current source;
- a surface vessel on which the source of electrical power is disposed;
- and
- a tow cable connected between the source of electrical power and the first and second current sources.
Dependencies are inferred from the claim text.