High voltage DC power for electromagnetic survey source
AssigneePGS Geophysical AS
InventorsOliver Peppe, Prawin Bhadani
Life of this patent
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Abstract
A marine electromagnetic survey system includes a power cable configured to couple to a power supply at one axial end, and to a head unit at the other end. The power supply includes a source of direct current which is coupled to the power cable. The head unit includes equipment configured to output a lower voltage at a higher current than the source of direct current. At least one electromagnetic antenna is coupled to the head unit and is configured to receive the output of the head unit equipment.
Claims20
A marine electromagnetic survey system, comprising:
- a power cable configured to couple to a power supply at one axial end, and to a head unit at the other end, wherein:
- the power supply comprises a source of direct current electrically coupled to the power cable at the one axial end;
- and
- the head unit comprises equipment configured to output a lower voltage at higher current than the source of direct current;
- and
- at least one electromagnetic antenna coupled to the head unit and configured to receive the output of the head unit equipment.
A method for inducing an electromagnetic field in formations disposed below the bottom of a body of water, comprising:
- conducting direct current to equipment disposed in the body of water from a power supply located away from the equipment;
- and
- applying output of the equipment to at least one electromagnetic antenna disposed in the body of water, wherein the equipment accepts direct current from the power supply and generates output having lower voltage and higher current than the direct current imparted thereto.
A method of marine geophysical surveying comprising:
- inducing an electromagnetic field in formations disposed below the bottom of a body of water, wherein inducing the electromagnetic field comprises:
- conducting direct current to equipment disposed in the body of water from a power supply located away from the equipment;
- and
- applying output of the current source to at least one electromagnetic antenna disposed in the body of water, wherein the equipment accepts direct current from the power supply and generates output having lower voltage and higher current than the direct current imparted thereto;
- and
- measuring electromagnetic response of the formations.
Dependencies are inferred from the claim text.