Apparatus and method of processing multi-component induction data

Patent metadata

Field	Value
Publication number	US-2016259082-A1
Application number	US-201315029162-A
Country	US
Kind code	A1
Filing date	Oct 30, 2013
Priority date	Oct 30, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

Various embodiments include apparatus and methods to utilize signals acquired from a multi-component induction tool operating in a wellbore. The acquired signals can be correlated to apparent conductivity of a formation and mapped to components of an apparent conductivity tensor. For each receiver array operated by the multi-component induction tool, a combination of these components from the acquired signals can be generated. Combinations generated from different receivers of the multi-component induction tool can be mixed together. From such combinations, data, with respect to evaluation of formation around the wellbore, can be generated. Additional apparatus, systems, and methods are disclosed.

First claim

1 . A method comprising:
acquiring signals generated from operating a multi-component induction tool in a wellbore, the multi-component induction tool having a plurality of receiver arrays; generating under control of a processor, for each receiver array at a fixed frequency, one or more combinations of components from the acquired signals, the components corresponding to components of an apparent conductivity tensor; mixing together, under control of the processor, combinations measured from the plurality of receiver arrays; and generating, under control of the processor, data, with respect to evaluation of a formation around the wellbore, from the mixing together combinations.

2 . The method of claim 1 , wherein the method includes:
acquiring signals generated from operating the multi-component induction tool at multiple subarrays and a number of different frequencies; generating, for each receiver array at each frequency, a combination of components from the acquired signals, the components corresponding to components of an apparent conductivity tensor; mixing together combinations measured from the plurality of receiver arrays at the different frequencies; and generating data with respect to evaluation of formation around the wellbore, from the mixed together combinations.

3 . The method of claim 1 , wherein the method includes:
performing the acquiring signals and the generating the combinations for a number of different locations to which the multi-component induction tool is disposed along the borehole; and mixing together the combinations from the different locations.

4 . The method of claim 1 , wherein generating combinations of components includes, for each receiver array and each frequency, generating aZZ+bXX+cYY with a, b, and c being numerical coefficients or generating dIJ+e JI, IJ and being different components of the apparent conductivity tensor with d and e being numerical coefficients.

5 . The method of claim 1 , wherein generating data with respect to evaluation of formation around the wellbore includes performing vertical-resolution matching based on the mixed together combinations measured from the plurality of receiver arrays.

6 . The method of claim 1 , herein gene ting data with respect to evaluation of formation around the wellbore includes:
separating the combination of components for each receiver array into two sets based on a distance of each receiver array from a transmitter array from which the acquiring signals is based, one set of the two sets having combinations of components from receiver arrays categorized as short arrays and the other set of the two sets having combinations of components from receiver arrays categorized as deeper arrays relative to the short arrays; and using the combination of components for each receiver array in an inversion process, in which data from the combinations of components of the short arrays is used as constraints in inverting the combinations of components of the deeper arrays.

7 . The method of claim 1 , wherein the method includes applying filters to the combinations of components from the receiver arrays, the filters being weights generated from generating an apparent conductivity of a radial-direction focusing log.

8 . The method of claim 7 ; wherein the generating data from the mixed together combinations includes using filter weights from a library/look-up table for different background conductivities.

9 . The method claim 1 , wherein the method includes selecting a format of the combination of components based on a specific feature of the formation.

10 . The method of claim 9 , wherein the specific feature is anisotropy, bed boundaries, or fractures.

11 . The method of claim 1 , wherein acquiring signals generated from operating the multi-component induction tool includes acquiring signals from a plurality of receiver triads disposed axially on the multi-component induction tool in response to a transmitter triad disposed axially on the multi-component induction tool generating probe signals, the receiver triads at different distances from the transmitter triad.

12 . A machine-readable storage device having instructions stored thereon, which, when performed by a machine, cause the machine to perform operations, the operations comprising:
acquiring signals generated from operating a multi-component induction tool in a wellbore, the multi-component induction tool having a plurality of receiver arrays; generating under control of a processor, for each receiver array at a fixed frequency, one or more combinations of components from the acquired signals, the components corresponding to components of an apparent conductivity tensor; mixing together, under control of the processor, combinations measured from the plurality of receiver arrays; and generating, under control of the processor, data, with respect to evaluation of a formation around the wellbore, from the mixing together combinations.

13 . A system comprising:
a tool structure, the tool structure being a multi-component induction tool structure having a transmitter array and a plurality of receiver arrays, the multi-component induction tool structure capable of operating in a wellbore; and a processing unit structured to:
acquire signals from the tool structure;
generate; under control of a processor, for each receiver array at a fixed frequency, one or more combinations of components from the acquired signals, the components corresponding to components of an apparent conductivity tensor;
mix together combinations measured from the plurality of receiver arrays; and
generate data, with respect to evaluation of formation around the wellbore, from the mixed together combinations.

14 . The system of claim 13 , wherein the processing unit is structured to:
acquire signals from the tool structure at a number of different frequencies; generate, for each receiver array at each frequency, a combination of components from the acquired signals, the components corresponding to components of an apparent conductivity tensor; mix together combinations measured from the plurality of receiver arrays at the different frequencies; and generate data with respect to evaluation of formation around the wellbore, from the mixed together combinations.

15 . The system of claim 13 , wherein the processing unit is structured to:
perform the acquisition of the signals and the generation of the combinations for a number of different locations to which the tool can be disposed along the borehole; and mix together the combinations from the different locations.

16 . The system of claim 13 , wherein generation of combinations of components includes, for each receiver array, generation of aZZ+bXX+cYY with a, b, and c being numerical coefficients or generation of dIJ+e JI, IJ and JI being different components of the apparent conductivity tensor and d and e being numerical coefficients.

17 . The system of claim 13 , wherein generation of data with respect to evaluation of formation around the wellbore includes performance of vertical-resolution matching/enhancement based on the mixed together combinations measured from the plurality of receiver arrays operated at multiple frequencies.

18 . The system of claim 13 , wherein generation of data with respect to evaluation of formation around the wellbore includes:
separation of the combination of components for each receiver array into two sets based on a distance of each receiver array from a transmitter array from which the acquiring signals is based, one set of t

Assignees

• Halliburton Energy Services Inc

Inventors

• San Martin Luis Emilio
• Hou Junsheng

Classifications

• E21B49/00

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• G01V3/38 Primary

  Processing data, e.g. for analysis, for interpretation, for correction · CPC title

• G01V3/28 Primary

  using induction coils · CPC title

• G16Z99/00

  Subject matter not provided for in other main groups of this subclass · CPC title

• G01N27/041

  of a solid body · CPC title