Method and apparatus to detect a conductive body
First Claim
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1. A method comprising:
- generating a probe signal into a formation below the earth'"'"'s surface from a transmitting sensor of a tool disposed below the earth'"'"'s surface;
receiving voltage signals in receiving sensors of the tool in response to generating the probe signal, the receiving sensors arranged in pairs to substantially cancel a magnetic field of a primary signal associated with the probe signal without rotating the receiving sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from a conductive body being a structure other than the formation and the tool, wherein the receiving sensors include two tilted sensors such that the two tilted sensors are arranged non-perpendicular to a longitudinal axis of the tool and oriented; and
determining an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive body determined using a magnitude of the voltages signals, formation resistivity, and dielectric constant.
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Abstract
Various embodiments include apparatus and methods to detect and locate conductive bodies and/or provide steam-assisted gravity drainage (SAGD) steering operation. Tools can be configured with receiving sensors (310) arranged to cancel substantially a primary signal associated with a probe signal without rotating the receiving sensors to cancel the primary signal and to capture a secondary signal generated from a conductive body (301) below the earth'"'"'s surface. Additional apparatus, systems, and methods are disclosed.
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Citations
29 Claims
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1. A method comprising:
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generating a probe signal into a formation below the earth'"'"'s surface from a transmitting sensor of a tool disposed below the earth'"'"'s surface; receiving voltage signals in receiving sensors of the tool in response to generating the probe signal, the receiving sensors arranged in pairs to substantially cancel a magnetic field of a primary signal associated with the probe signal without rotating the receiving sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from a conductive body being a structure other than the formation and the tool, wherein the receiving sensors include two tilted sensors such that the two tilted sensors are arranged non-perpendicular to a longitudinal axis of the tool and oriented; and determining an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive body determined using a magnitude of the voltages signals, formation resistivity, and dielectric constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory machine-readable storage device having instructions stored thereon, which, when performed by a machine, cause the machine to perform operations, the operations comprising:
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generating a probe signal into a formation below the earth'"'"'s surface from a transmitting sensor of a tool disposed below the earth'"'"'s surface; receiving voltage signals in receiving sensors of the tool in response to generating the probe signal, the receiving sensors arranged in pairs to substantially cancel a magnetic field of a primary signal associated with the probe signal without rotating the receiving sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from the conductive body being a structure other than the formation and the tool, wherein the receiving sensors include two tilted sensors such that the two tilted sensors are arranged non-perpendicular to a longitudinal axis of the tool and oriented; and determining an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive hod determined using a magnitude of the voltages signals, formation resistivity, and dielectric constant. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A system comprising:
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a transmitter sensor and receiver sensors disposed on a structure, the receiver sensors including two tilted sensors arranged such that the two tilted sensors are non;
perpendicular to a longitudinal axis of the structure and oriented, the two tilted sensors to operate as a pair to substantially cancel a magnetic field of a primary signal associated with a probe signal generated by the transmitter sensor into the formation without rotating the receiver sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from a conductive body in the formation below the earth'"'"'s surface, the conductive body being different from the formation, the conductive body separate from the structure;a control unit operable to manage generation of the probe signal from the transmitter sensor and to manage collection of received voltage signals at the receiver sensors; and a data processing unit to determine an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive body using a magnitude of the voltage signals, formation resistivity and dielectric constant. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification