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US 5,331,331 AGranted
Electromagnetic propagation tool using dipole antennas
AssigneeBaker Hughes Incorporated
InventorJian-qun Wu
Life of this patent
Estimating the term…
Abstract
An electromagnetic propagation tool using magnetic dipole antennas comprising small current loops having characteristics of a point dipole is presented. The electromagnetic tool comprises a drill collar segment having at least one dipole antenna for each transmitter and receiver antenna. The dipole antennas are disposed within pockets formed in the drill collar segment.
Claims49
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- transmitter means, said transmitter means being disposed on said drill collar segment, said transmitter means comprising at least one transmitting magnetic dipole antenna for propagating an electromagnetic wave, said transmitting magnetic dipole antenna having characteristics of a point dipole;
- at least one receiver means, said receiver means being disposed on said drill collar segment at an axial distance from said transmitter means, said receiver means comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter means, said receiving magnetic dipole antenna having characteristics of a point dipole;
- and
- wherein said transmitting magnetic dipole antenna and said receiving magnetic dipole antenna are disposed within noncircumferential pockets formed in the outer surface of said drill collar segment.
2 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- transmitter means, said transmitter means being disposed on said drill collar segment, said transmitter means comprising at least one transmitting magnetic dipole antenna for propagating an electromagnetic wave, said transmitting magnetic dipole antenna having characteristics of a point dipole;
- at least one receiver means, said receiver means being disposed on said drill collar segment at an axial distance from said transmitter means, said receiver means comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter means, said receiving magnetic dipole antenna having characteristics of a point dipole;
- wherein said at least one transmitting magnetic dipole antenna comprises three circumferentially spaced transmitting magnetic dipole antennas, each of said transmitting antennas propagating the corresponding electromagnetic wave and each of said transmitting antennas having characteristics of a point dipole;
- and
- wherein said at least one receiving magnetic dipole antenna comprises three circumferentially spaced receiving magnetic dipole antennas, each of said receiving antennas receiving the electromagnetic wave propagated from said transmitting antennas and each of said receiving antennas having characteristics of a point dipole.
3 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- transmitter means, said transmitter means being disposed on said drill collar segment, said transmitter means comprising at least one transmitting magnetic dipole antenna for propagating an electromagnetic wave, said transmitting magnetic dipole antenna having characteristics of a point dipole;
- at least one receiver means, said receiver means being disposed on said drill collar segment at an axial distance from said transmitter means, said receiver means comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter means, said receiving magnetic dipole antenna having characteristics of a point dipole;
- wherein said at least one receiver means comprises two axially spaced apart receiver means, wherein said two receiver means comprises a near receiver means and a far receiver means;
- wherein said at least one transmitting magnetic dipole antenna comprises three circumferentially spaced transmitting magnetic dipole antennas, each of said transmitting antennas propagating the corresponding electromagnetic wave and each of said transmitting antennas having characteristics of a point dipole;
- wherein said near receiver means comprises three circumferentially spaced near receiving magnetic dipole antennas, each of said near receiving antennas receiving the electromagnetic wave propagated from said transmitting antenna and each of said near receiving antennas having characteristics of a point dipole;
- and
- wherein said far receiver means comprises three circumferentially spaced far receiving magnetic dipole antennas, each of said far receiving antennas receiving the electromagnetic wave propagated from said transmitting dipole antennas and each of said far receiving antennas having characteristics of a point dipole.
5 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- three transmitting magnetic dipole antennas circumferentially spaced about said drill collar segment, each of said transmitting magnetic dipole antennas propagating an electromagnetic wave in response to a first electrical signal, each of said transmitting magnetic dipole antennas having the characteristics of a point dipole;
- three near receiving magnetic dipole antennas circumferentially spaced about said drill collar segment at a first axial distance from said transmitting magnetic dipole antennas, each of said near receiving magnetic dipole antennas being in substantial axial alignment with a corresponding one of each of said transmitting magnetic dipole antennas, each of said near receiving magnetic dipole antennas receiving the electromagnetic wave propagation from said transmitting magnetic dipole antennas and providing a second electrical signal indicative of the electromagnetic wave received, each of said near receiving magnetic dipole antennas having characteristics of a point dipole;
- and
- three far receiving magnetic dipole antennas circumferentially spaced about said drill collar segment at a second axial distance from said near receiving magnetic dipole antennas, said second axial distance being greater than said first axial distance, each of said far receiving magnetic dipole antennas being in substantial circumferential alignment with a corresponding one of each of said transmitting magnetic dipole antennas, each of said far receiving magnetic dipole antennas receiving the electromagnetic wave propagated from said transmitting magnetic dipole antennas and providing a third electrical signal indicative of the electromagnetic wave received, each of said far receiving magnetic dipole antennas having characteristics of a point dipole.
2 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- first and second transmitter means, said first and second transmitter means being disposed on said drill collar segment wherein said first transmitter means is longitudinally spaced apart from said second transmitter means on said drill collar segment, each of said first and second transmitter means comprising at least one transmitting magnetic dipole antenna having characteristics of a point dipole, said transmitting magnetic dipole antennas for propagating an electromagnetic wave;
- and
- at least one receiver means, said receiver means being disposed on said drill collar segment wherein said receiver means is symmetrically spaced longitudinally between said first and second transmitter means on said drill collar segment, said receiver means comprising at least one receiving magnetic dipole antenna having characteristics of a point dipole, said receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said first and second transmitter means.
1 more element
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- three first transmitting magnetic dipole antennas circumferentially spaced about said drill collar segment, each of said first transmitting magnetic dipole antennas propagating an electromagnetic wave in response to a first electrical signal, each of said first transmitting magnetic dipole antennas having the characteristics of a point dipole;
- three second transmitting magnetic dipole antennas circumferentially spaced about said drill collar segment, each of said second transmitting magnetic dipole antennas propagating an electromagnetic wave in response to a second electrical signal, each of said second transmitting magnetic dipole antennas having the characteristics of a point dipole, said second transmitting magnetic dipole antennas being longitudinally spaced apart from said first transmitting magnetic dipole antennas, each of said second transmitting magnetic dipole antennas being in substantial axial alignment with a corresponding one of each of said first transmitter magnetic dipole antennas;
- three first receiving magnetic dipole antennas circumferentially spaced about said drill collar segment, each of said first receiving magnetic dipole antennas being in substantial axial alignment with a corresponding one of each of said first transmitting magnetic dipole antennas, each of said first receiving magnetic dipole antennas receiving the electromagnetic wave propagated from said first and second transmitting magnetic dipole antennas and providing a third electrical signal indicative of the electromagnetic wave received, each of said first receiving magnetic dipole antennas having characteristics of a point dipole;
- and
- three second receiving magnetic dipole antennas circumferentially spaced about said drill collar segment, said second receiving magnetic dipole antennas being longitudinally spaced from said first receiving magnetic dipole antennas and said first and second receiving magnetic dipole antennas together being symmetrically spaced longitudinally between said first and second transmitting magnetic dipole antennas, each of said second receiving magnetic dipole antennas being in substantial circumferential alignment with a corresponding one of each of said first transmitting magnetic dipole antennas, each of said second receiving magnetic dipole antennas receiving the electromagnetic wave propagated from said first and second transmitting magnetic dipole antennas and providing a fourth electrical signal indicative of the electromagnetic wave received, each of said second receiving magnetic dipole antennas having characteristics of a point dipole.
3 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- at least one first noncircumferential pocket formed in the outer surface of said drill collar segment;
- transmitter means comprising at least one transmitting magnetic dipole antenna disposed in a corresponding said at least one first pocket, said transmitting magnetic dipole antenna for propagating an electromagnetic wave;
- at least one second noncircumferential pocket formed in the outer surface of said drill collar segment at axial distance from said first pocket;
- and
- at least one receiver means comprising at least one receiving magnetic dipole antenna disposed in a corresponding said at least one second pocket, said receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter means.
3 more elements
Dependencies are inferred from the claim text.