Generating a complete borehole image using transformation

Patent metadata

Field	Value
Publication number	US-11995791-B2
Application number	US-202117390068-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Jul 30, 2021
Publication date	May 28, 2024
Grant date	May 28, 2024

Abstract

A system can receive downhole acquisition data relating to a wellbore. The system can pre-process the downhole acquisition data. The system can generate an incomplete borehole image using the downhole acquisition data. The system can determine a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image. The system can generate a complete borehole image based on an inverse of the sparse representation.

First claim

What is claimed is:

1. A system comprising:
a processor; and
a non-transitory computer-readable medium comprising instructions that are executable by the processor to cause the processor to perform operations comprising:
receiving downhole acquisition data relating to a wellbore;
pre-processing the downhole acquisition data by balancing an amplitude of the downhole acquisition data and by replicating azimuthal data strips for representing a 2D-image that resembles the wellbore;
generating an incomplete borehole image using the downhole acquisition data;
determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image; and
generating a complete borehole image based on an inverse of the sparse representation.

2. The system of claim 1 , wherein the operations further comprise using the complete borehole image for controlling a treatment operation with respect to the wellbore.

3. The system of claim 1 , wherein the operation of generating the incomplete borehole image using the downhole acquisition data includes generating a plot of depth versus azimuth, wherein the plot includes a plurality of strips, wherein the plurality of strips includes a set of unknown data strips that are interspersed between a set of known data strips, and wherein a first known data strip is identical to a last known data strip.

4. The system of claim 1 , wherein the operation of determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image includes determining a transformation, and wherein the transformation includes one of a one-dimensional discrete cosine transformation, a two-dimensional discrete cosine transformation, and a two-dimensional discrete Fourier transformation.

5. The system of claim 1 , wherein the operation of generating the complete borehole image includes applying an inverse transformation to the sparse representation based on the incomplete borehole image to generate the complete borehole image.

6. The system of claim 1 , wherein the operation of determining the sparse representation based on the incomplete borehole image by performing the optimization with respect to the incomplete borehole image includes minimizing the sparse representation of the incomplete borehole image in an L p space subject to one or more constraints.

7. A method comprising:
receiving downhole acquisition data relating to a wellbore;
pre-processing the downhole acquisition data by balancing an amplitude of the downhole acquisition data and by padding of azimuthal data to implicate geometry of the wellbore;
generating an incomplete borehole image using the downhole acquisition data;
determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image; and
generating a complete borehole image based on an inverse of the sparse representation.

8. The method of claim 7 , further comprising using the complete borehole image for controlling a treatment operation with respect to the wellbore.

9. The method of claim 7 , wherein generating the incomplete borehole image using the downhole acquisition data includes generating a plot of depth versus azimuth, wherein the plot includes a plurality of strips, wherein the plurality of strips includes a set of unknown data strips that are interspersed between a set of known data strips, and wherein a first known data strip is identical to a last known data strip.

10. The method of claim 7 , wherein determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image includes determining a transformation, and wherein the transformation includes one of a one-dimensional discrete cosine transformation, a two-dimensional discrete cosine transformation, and a two-dimensional discrete Fourier transformation.

11. The method of claim 7 , wherein generating the complete borehole image includes applying an inverse transformation to the sparse representation of the incomplete borehole image to generate the complete borehole image.

12. The method of claim 7 , wherein determining the sparse representation based on the incomplete borehole image by performing the optimization with respect to the incomplete borehole image includes minimizing the sparse representation of the incomplete borehole image in an L p space subject to one or more constraints.

13. A non-transitory computer-readable medium comprising instructions that are executable by a processing device for causing the processing device to perform operations comprising:
receiving downhole acquisition data relating to a wellbore;
pre-processing the downhole acquisition data by balancing an amplitude of the downhole acquisition data and by padding of azimuthal data to implicate geometry of the wellbore;
generating an incomplete borehole image using the downhole acquisition data;
determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image; and
generating a complete borehole image based on an inverse of the sparse representation.

14. The non-transitory computer-readable medium of claim 13 , wherein the operations further comprise using the complete borehole image for controlling a treatment operation with respect to the wellbore.

15. The non-transitory computer-readable medium of claim 13 , wherein the operation of generating the incomplete borehole image using the downhole acquisition data includes generating a plot of depth versus azimuth, wherein the plot includes a plurality of strips, wherein the plurality of strips includes a set of unknown data strips that are interspersed between a set of known data strips, and wherein a first known data strip is identical to a last known data strip.

16. The non-transitory computer-readable medium of claim 13 , wherein the operation of determining a sparse representation based on the incomplete borehole image by performing an optimization with respect to the incomplete borehole image includes determining a transformation, and wherein the transformation includes one of a one-dimensional discrete cosine transformation, a two-dimensional discrete cosine transformation, and a two-dimensional discrete Fourier transformation.

17. The non-transitory computer-readable medium of claim 13 , wherein the operation of generating the complete borehole image includes applying an inverse transformation to the sparse representation of the incomplete borehole image to generate the complete borehole image, and wherein the operation of determining the sparse representation based on the incomplete borehole image by performing the optimization with respect to the incomplete borehole image includes minimizing the sparse representation of the incomplete borehole image in an L p space subject to one or more constraints.

Assignees

• Halliburton Energy Services Inc

Inventors

• Ma Ho Yin
• Tu Ning
• Wu Xiang

Classifications

• G06T11/26

  Drawing of charts or graphs · CPC title

• G06T3/10 Primary

  Selection of transformation methods according to the characteristics of the input images · CPC title

• E21B47/0025 Primary

  generating an image of the borehole wall using down-hole measurements, e.g. acoustic or electric · CPC title

• G06T3/04

  Context-preserving transformations, e.g. by using an importance map (panospheric to cylindrical image transformations G06T3/12) · CPC title

• G06T7/0004

  Industrial image inspection · CPC title