Borehole Transient EM System for Reservoir Monitoring
First Claim
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1. A transient electromagnetic (TEM) system configured to estimate a location of a fluid interface in an earth formation, the system comprising:
- at least one electromagnetic (EM) transmitter including a magnetic core having a residual magnetization disposed in a borehole in the earth formation; and
at least one processor configured to;
cause an antenna coupled to the at least one EM transmitter to produce a transient EM signal in the earth formation by altering a direction of the residual magnetization, anduse a signal produced by at least one receiver responsive to the transient EM signal to estimate the location of the fluid interface.
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Abstract
A transient electromagnetic borehole system uses an arrangement of sensors deployed in a borehole for reservoir monitoring. Non-conductive casing sections may be used along with an efficient transmitter configured to provide measurements up to 300 m from the borehole. By using multiple receivers, the method can also be used without nonconductive casing.
37 Citations
16 Claims
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1. A transient electromagnetic (TEM) system configured to estimate a location of a fluid interface in an earth formation, the system comprising:
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at least one electromagnetic (EM) transmitter including a magnetic core having a residual magnetization disposed in a borehole in the earth formation; and at least one processor configured to; cause an antenna coupled to the at least one EM transmitter to produce a transient EM signal in the earth formation by altering a direction of the residual magnetization, and use a signal produced by at least one receiver responsive to the transient EM signal to estimate the location of the fluid interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of estimating a location of a fluid interface in an earth formation, the method comprising:
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deploying at least one electromagnetic (EM) transmitter including a magnetic core having a residual magnetization in a borehole in the earth formation; and using at least one processor for; causing an antenna coupled to the at least one EM transmitter to produce a transient EM signal in the earth formation by altering a direction of the residual magnetization, and using a signal produced by at least one receiver responsive to the transient EM signal for estimating the location of the fluid interface. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification