ELECTROMAGNETIC IMAGING METHOD AND DEVICE
First Claim
1. An electromagnetic imaging method for electromagnetically measuring physical parameters of a pipe (CJ, CC) by means of a plurality of measuring arrangement (ZMA, MCMA, MonMa, ImMA) comprising a plurality of transmitter coil (ZTX, LFTX, DTX) and a plurality of receiver coil (ZRX1, ZR2, MRX, MC, PRX1, PRX2, PRX3, PRX4, PRX5, PRX6, PRX7, PRX8, PRX9, PRX10, PRX11, PRX12, PRX13, PRX14, PRX15, PRX16, PRX17, PRX18), the transmitter coils and receiver coils being associated so as to form the plurality of measuring arrangement, the plurality of measuring arrangement being adapted to be positioned into the pipe and displaced through the pipe, the physical parameters being measured for a plurality of position along the pipe, the method comprising the steps of:
- a) determining a first value of an average ratio of magnetic permeability to electrical conductivity and a first value of an average inner diameter of the pipe (Z-MES),b) determining an average electromagnetic thickness of the pipe (MC-MES),c) determining a second value of the average ratio of magnetic permeability to electrical conductivity and a second value of the average inner diameter of the pipe (Mon-MES) according to excitation frequencies which are substantially lower than the excitation frequencies used to determine the first values (Z-MES),d) determining a first image (EMTIM) of a local electromagnetic thickness of the pipe and the pipe local defects (Im-MES),e) discriminating the local defects at an inside perimeter of the pipe from the local defects at an outside perimeter of the pipe (Dis-MES), andf) forming a corrected first image (IOFIM) of the pipe taking into account a position of the local defects.
1 Assignment
0 Petitions
Accused Products
Abstract
An electromagnetic imaging method for electromagnetically measuring physical parameters of a pipe CJ, CC by means of a plurality of measuring arrangement ZMA, MCMA, MonMa, ImMA comprising a plurality of transmitter coil ZTX, LFTX, DTX and a plurality of receiver coil ZRX1, ZR2, MRX, MC, PRX1, PRX2, PRX3, PRX4, PRX5, PRX6, PRX7, PRX8, PRX9, PRX10, PRX11, PRX12, PRX13, PRX14, PRX15, PRX16, PRX17, PRX18, the transmitter coils and receiver coils being associated so as to form the plurality of measuring arrangement, the plurality of measuring arrangement being adapted to be positioned into the pipe and displaced through the pipe, the physical parameters being measured for a plurality of position along the pipe, the method comprising the steps of:
- a) determining a first value of an average ratio of magnetic permeability to electrical conductivity and a first value of an average inner diameter of the pipe Z-MES,
- b) determining an average electromagnetic thickness of the pipe MC-MES,
- c) determining a second value of the average ratio of magnetic permeability to electrical conductivity and a second value of the average inner diameter of the pipe Mon-MES according to excitation frequencies which are substantially lower than the excitation frequencies used to determine the first values Z-MES,
- d) determining a first image EMTIM of the pipe electromagnetic thickness and the pipe defects Im-MES,
- e) discriminating the defects at an inside perimeter of the pipe from the defects at an outside perimeter of the pipe Dis-MES, and
- f) forming a corrected first image IOFIM of the pipe taking into account a position of the defects.
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Citations
18 Claims
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1. An electromagnetic imaging method for electromagnetically measuring physical parameters of a pipe (CJ, CC) by means of a plurality of measuring arrangement (ZMA, MCMA, MonMa, ImMA) comprising a plurality of transmitter coil (ZTX, LFTX, DTX) and a plurality of receiver coil (ZRX1, ZR2, MRX, MC, PRX1, PRX2, PRX3, PRX4, PRX5, PRX6, PRX7, PRX8, PRX9, PRX10, PRX11, PRX12, PRX13, PRX14, PRX15, PRX16, PRX17, PRX18), the transmitter coils and receiver coils being associated so as to form the plurality of measuring arrangement, the plurality of measuring arrangement being adapted to be positioned into the pipe and displaced through the pipe, the physical parameters being measured for a plurality of position along the pipe, the method comprising the steps of:
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a) determining a first value of an average ratio of magnetic permeability to electrical conductivity and a first value of an average inner diameter of the pipe (Z-MES), b) determining an average electromagnetic thickness of the pipe (MC-MES), c) determining a second value of the average ratio of magnetic permeability to electrical conductivity and a second value of the average inner diameter of the pipe (Mon-MES) according to excitation frequencies which are substantially lower than the excitation frequencies used to determine the first values (Z-MES), d) determining a first image (EMTIM) of a local electromagnetic thickness of the pipe and the pipe local defects (Im-MES), e) discriminating the local defects at an inside perimeter of the pipe from the local defects at an outside perimeter of the pipe (Dis-MES), and f) forming a corrected first image (IOFIM) of the pipe taking into account a position of the local defects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14)
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13. An electromagnetic imaging device for electromagnetically measuring physical parameters of a pipe, the electromagnetic imaging device being adapted to be positioned into the pipe, displaced through the pipe and coupled to a surface equipment,
wherein the electromagnetic imaging device comprises an average electromagnetic thickness measuring arrangement (MCMA), an imaging measuring arrangement (ImMA), a monitoring measuring arrangement (MonMA), an average casing properties measuring arrangement (ZMA) and discriminating measuring arrangement (DisMA), each measuring arrangement comprising a transmitter coil and at least one receiver coil, each measuring arrangement being coupled to an electronic arrangement (ZEA, MCEA, MonEA, ImEA, DisEA) comprising a transmitter circuit for exciting the transmitter coil by means of a transmitter current according to a plurality of excitation frequencies, and a receiver circuit for measuring a receiver voltage at the receiver coil, wherein each electronic arrangement is further coupled to a calculating module (CALCMOD) for: -
determining a first value of an average ratio of magnetic permeability to electrical conductivity and a first value of an average inner diameter of the pipe, determining a value of an average electromagnetic thickness of the pipe, determining a second value of the average ratio of magnetic permeability to electrical conductivity and a second value of the average inner diameter of the pipe according to excitation frequencies which are substantially lower than the excitation frequencies used to determine the first values, determining a first image (EMTIM) of a local electromagnetic thickness of the pipe and the pipe local defects, discriminating the local defects at an inside perimeter of the pipe from the local defects at an outside perimeter of the pipe, and forming a corrected first image (IOFIM) of the pipe taking into account a position of the local defects. - View Dependent Claims (15, 16, 17, 18)
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Specification