Method and apparatus for full offset resistivity imaging for...

Details Method and apparatus for full offset resistivity imaging for... Method and apparatus for full offset resistivity imaging for...

G - Physics

01

V

G01V 3/18 (2006.01) E21B 47/12 (2012.01) G01V 3/34 (2006.01)

Patent

CA 2415921

Using micro-resistivity techniques, an image of the wall of a borehole can be obtained. A downhole tool stack is provided with plural imaging tools, wherein each imaging tool has a set of pads that deploy radially outward to contact the borehole wall to obtain the image thereof. As the pads deploy outwardly, gaps are formed between the pads. The pads of one tool are circumferentially offset relative to the pads of the other tool so that more complete circumferential coverage of the borehole wall is obtained during the imaging process. Furthermore, an adaptive polling technique is utilized to telemeter the large amounts of data generated by the two imaging tools to the surface. Data is obtained from the imaging tools by polling at a particular rate, which rate is modified depending upon the amount of data generated by the imaging tools.

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