Back to results
US 5,491,488 AGranted
Electromagnetic propagation tool using magnetic 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/or receiver antenna. The dipole antennas are disposed within pockets formed in the drill collar segment.
Claims41
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- a transmitter comprising at least one transmitting magnetic dipole antenna for propagating an electromagnetic wave, said transmitting magnetic dipole antenna comprising a small current loop dipole antenna noncircumferentially disposed on said drill collar segment;
- and
- at least one receiver comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter, said receiving magnetic dipole antenna comprising a small current loop dipole antenna noncircumferentially disposed on said drill collar segment at an axial distance from said transmitter.
1 more element
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- a transmitter disposed on said drill collar segment, said transmitter comprising a transmitting magnetic dipole antenna for propagating an electromagnetic wave;
- and
- at least one receiver comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter, said receiving magnetic dipole antenna comprising a small current loop dipole antenna noncircumferentially disposed on said drill collar segment at an axial distance from said transmitter.
1 more element
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- a transmitter comprising at least one transmitting magnetic dipole antenna for propagating an electromagnetic wave, said transmitting magnetic dipole antenna comprising a small current loop dipole antenna noncircumferentially disposed on said drill collar segment;
- and
- at least one receiver disposed on said drill collar segment at an axial distance from said transmitter, said receiver comprising a receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter.
1 more element
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- a transmitter comprising a transmitting magnetic dipole antenna disposed on said drill collar segment, said transmitting magnetic dipole antenna for propagating an electromagnetic wave;
- at least one noncircumferential pocket formed in the outer surface of said drill collar segment at axial distance from said transmitter, and
- at least one receiver comprising at least one receiving magnetic dipole antenna disposed in a corresponding said at least one pocket, said receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter.
1 more element
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- transmitter disposed on said drill collar segment, said transmitter comprising a transmitting magnetic dipole antenna for propagating an electromagnetic wave;
- at least one receiver disposed on said drill collar segment at an axial distance from said transmitter, said receiver comprising at least one receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter, said receiving magnetic dipole antenna having characteristics of a point dipole;
- wherein said at least one receiver comprises two axially spaced apart receivers wherein said two receivers comprise a near receiver and a far receiver;
- wherein said near receiver 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 comprises three circumferentially spaced far receiving magnetic dipole antennas, each of said far receiving antennas receiving the electromagnetic wave propagated from said transmitting antenna and each of said far receiving antennas having characteristics of a point dipole.
4 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- at least one noncircumferential pocket formed in the outer surface of said drill collar segment;
- a transmitter comprising at least one transmitting magnetic dipole antenna disposed in a corresponding said at least one pocket, said transmitting magnetic dipole antenna for propagating an electromagnetic wave;
- and
- at least one receiver comprising a receiving magnetic dipole antenna disposed on said drill collar segment, said receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter.
2 more elements
An electromagnetic propagation tool, comprising:
- a drill collar segment;
- a transmitter disposed on said drill collar segment, said transmitter 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 disposed on said drill collar segment at an axial distance from said transmitter, said receiver comprising a receiving magnetic dipole antenna for receiving the electromagnetic wave propagated by said transmitter;
- wherein said at least one receiver comprises two axially spaced apart receivers, wherein said two receivers comprise a near receiver and a far receiver;
- 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.
2 more elements
Dependencies are inferred from the claim text.