Borehole Image Compression

摘要

Devices and methods for obtaining borehole images at a surface installation while a borehole-imaging downhole tool is logging a borehole are provided. One such method may involve, while the downhole tool is disposed in the borehole, obtaining a first borehole image at a first depth of investigation using the borehole-imaging downhole tool. Compression electronics may compress the first borehole image to obtain a first compressed borehole image. Compressing the first borehole image may involve exploiting a symmetry characteristic of the first borehole image to increase compression efficiency or exploiting a similarity of the first borehole image with a second borehole image to increase compression efficiency, or both. The compressed borehole image then may be efficiently transmitted to the surface installation via a telemetry system.

主权项

1. A method for obtaining borehole images at a surface installation while a borehole-imaging downhole tool is logging a borehole, the method comprising:
while the downhole tool is disposed in the borehole:
obtaining a first borehole image at a first depth of investigation using the borehole-imaging downhole tool;compressing the first borehole image using downhole compression electronics to obtain a first compressed borehole image, wherein compressing the first borehole image comprises exploiting a symmetry characteristic of the first borehole image to increase compression efficiency or exploiting a similarity of the first borehole image with a second borehole image to increase compression efficiency, or exploiting both the symmetry characteristic of the first borehole image and the similarity of the first borehole image with the second borehole image; andtransmitting the first compressed borehole image to the surface installation via a telemetry system.