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US 7,612,567 B2Granted
Two-axial pad formation resistivity imager
AssigneeBaker Hughes Incorporated
InventorsGregory B. Itskovich, Randy Gold, Alexandre N. Bespalov, Stanislav W. Forgang
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Abstract
A resistivity imaging device injects currents in two orthogonal directions using two pairs of return electrodes and performing impedance measurements of the buttons placed between the returns.
Claims21
An apparatus for evaluating an earth formation penetrated by a borehole, the apparatus comprising:
- (a) a pad configured to be proximate to a wall of the borehole;
- (b) a first electrode disposed on the pad, the first electrode being configured to convey a current into the earth formation;
- (c) a return electrode horizontally displaced from the first electrode;
- and
- (d) a processor configured to:
- (A) select a frequency of the current using a resistivity of a borehole fluid and (II) a permittivity of the borehole fluid;
- (B) determine a resistivity property of the earth formation from the current in the first electrode and a voltage between the first electrode and the return electrode, and
- (C) record the resistivity property on a suitable medium.
5 more elements
A method of evaluating an earth formation, the method comprising:
- (a) conveying a current into the earth formation using a pad-mounted current electrode proximate to a wall of a borehole in the formation a frequency of the current being selected using a resistivity of a borehole fluid and (II) a permittivity of the borehole fluid;
- (b) receiving the current in a return electrode horizontally separated from the current electrode;
- (c) determining a resistivity property of the earth formation from the current in the current electrode and a voltage between the current electrode and the return electrode;
- and
- (d) recording the determined resistivity property on a suitable medium.
2 more elements
A computer readable medium for use with an apparatus for evaluating an earth formation penetrated by a borehole, the apparatus comprising:
- (a) at least one pad conveyed in a borehole the at least one pad proximate to a wall of the borehole;
- (b) at least one current electrode disposed on the at least one pad, the at least one current electrode configured to convey a current into the earth formation a frequency of the current being selected using a resistivity of a borehole fluid and (II) a permittivity of the borehole fluid;
- and
- (c) at least one return electrode horizontally displaced from the at least one current electrode;
- the medium comprising instructions that enable a processor to determine a resistivity property of the earth formation from the current in the at least one current electrode and a voltage between the at least one current electrode and the at least one return electrode.
2 more elements
Dependencies are inferred from the claim text.