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US 4,949,045 AGranted
Well logging apparatus having a cylindrical housing with antennas formed in recesses and covered with a waterproof rubber layer
AssigneeSchlumberger Technology Corporation
InventorsBrian Clark, Jacques Jundt, Martin Luling, Michael O. Ross
Life of this patent
Estimating the term…
Abstract
A well logging apparatus is disclosed including a cylindrical housing with a transmitting antenna and first and second receiving antennas. The antennas are formed on insulating material in recesses in the housing and have a waterproof rubber covering. The receiving antennas have adjacent compartments containing signal conditioning circuits.
Claims19
A well logging device for investigating formations surrounding a borehole, comprising:
- an elongated generally cylindrical housing moveable through the borehole;
- a transmitting antenna and first and second receiving antennas carried by said housing, said receiving antennas being successively spaced longitudinally from said transmitting antenna;
- first and second compartments in said housing, each of said compartments being adjacent a respective receiving antenna, and having at least one communicating passage through the housing to its respective receiving antenna, each of said compartments containing signal conditioning means that include impedance matching and preamplification means, each antenna being coupled to said signal conditioning means through said communicating passage;
- means for applying electromagnetic energy to said transmitting antenna;
- and
- means coupled to said signal conditioning means for receiving signals from said receiving antennas and for measuring said signals.
3 more elements
A well logging device for investigating formations surrounding a borehole, comprising:
- an elongated generally cylindrical housing moveable through the borehole;
- a transmitting antenna and first and second receiving antennas mounted in said housing, said receiving antennas being successively spaced longitudinally from said transmitting antenna;
- each of said antennas comprising a recess formed in said housing, fiberglass insulating material disposed on said recess, a coil wound on said recess, an insulating waterproof rubber layer covering said coil and said fiberglass insulating material, and a slotted metal shield covering said layer;
- means for applying electromagnetic energy to the coil of said transmitting antenna;
- means for receiving signals from the coils of said receiving antennas and for measuring said signals.
2 more elements
A well logging device for investigating formations surrounding a borehole, comprising:
- an elongated generally cylindrical metal housing moveable through the borehole;
- a transmitting antenna and first and second receiving antennas carried by said housing, said receiving antennas being successively spaced longitudinally from said transmitting antenna, each of said transmitting and receiving antennas being wound on insulating material and having an insulating waterproof layer covering said coil and insulating material, and a slotted metal shield covering said layer;
- first and second compartments in said housing, each of said compartments being adjacent a respective receiving antenna, and having at least one communicating passage through the housing to its respective receiving antenna, each of said compartments containing signal conditioning means, each antenna being coupled to said signal conditioning means through said communicating passage;
- means for applying electromagnetic energy to said transmitting antenna;
- and
- means coupled to said signal conditioning means for receiving signals from said receiving antennas and for measuring said signals.
3 more elements
A well logging device for investigating formations surrounding a borehole, comprising:
- an elongated generally cylindrical housing moveable through the borehole;
- a transmitting antenna and first and second receiving antennas carried by said housing, said receiving antennas being successively spaced longitudinally from said transmitting antenna;
- first and second compartments in said housing, each of said compartments being adjacent a respective receiving antenna, and having at least one communicating passage through the housing to its respective receiving antenna, each of said compartments containing signal conditioning means, each antenna being coupled to said signal conditioning means through said communicating passage;
- means for applying electromagnetic energy to said transmitting antenna;
- means coupled to said signal conditioning means for receiving signals from said receiving antennas and for measuring said signals, the means for measuring said signals including:
- means for detecting the phase shift between electromagnetic energy received at said receiving antennas;
- means for detecting the attenuation between electromagnetic energy received at said receiving antennas;
- means for determining, as a function of the detected phase shift, the resistivity of formations at a relatively shallow depth of investigation around said receiving antennas;
- and
- means for determining, as a function of the detected attenuation, the resistivity of formations at a relatively deep depth of investigation around said receiving antennas.
7 more elements
A well logging device for investigating formations surrounding a borehole, comprising:
- an elongated generally cylindrical housing moveable through the borehole;
- first and second longitudinally spaced transmitting antennas and first and second receiving antennas carried by said housing, said receiving antennas being longitudinally spaced between said transmitting antennas;
- first and second compartments in said housing, each of said compartments being adjacent a respective receiving antenna, and having at least one communicating passage through the housing to its respective receiving antenna, each of said compartments containing signal conditioning means, each antenna being coupled to said signal conditioning means through said communicating passage;
- means for applying electromagnetic energy to alternately energize said first and second transmitting antennas;
- and
- means coupled to said signal conditioning means for receiving signals from said receiving antennas and for measuring said signals.
3 more elements
Dependencies are inferred from the claim text.