Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate
2007-01-30
2007-01-30
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
C324S333000
Reexamination Certificate
active
11335847
ABSTRACT:
A new application of electromagnetic tomography is described directly related to the efficient recovery of oil and gas as well the removal of unwanted liquids from subsurface formations. The process involves the deployment of both surface and a single borehole magnetic dipole structures used for both transmitting and receiving low frequency electromagnetic energy. The surface antenna consists of circularly concentric arrays of small receiving solenoid antennas and the downhole system consists of one or more solenoid antenna in a single borehole. The concentricity of the surface array is centered about or in proximity to the borehole axis. The electromagnetic field radiated by the downhole antenna is received by each surface antenna. The amplitude and phase of voltages and currents received by each surface antenna is electronically processed based on the theoretical processing principles similar to what has been recently established for electromagnetic impedance tomography (EMIT). Several concentric surface antenna arrays with electronic switching between each circular array and the downhole solenoid will have the ability to image the spread and movement of oil and gas during thermal treatment and provide three dimensional temperature measurement. The oil movement to recovery wells may be provided by radio frequency heating or steam flood as in enhanced oil recovery. This information allows for developing very efficient oil and fluid recovery techniques by actually observing topographic images developed according to this invention.
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Alumbaugh, David L., et al., “Monitoring Subsurface Changes Over Time with Cross-Well Electromagnetic Tomography”, Geophysical Prospecting, 1995, 43,873-902.
Nekut, Anthony G., “Crosswell Electromagnetic Tomography in Steel-Cased Wells”, Geophysics, vol. 60 ,No. 3 (May-Jun. 1995) p. 912-920.
Dorsey & Whitney LLP
KSN Energies, LLC
LeDynh Bot
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