Title:
DOWNHOLE TRANSIENT RESISTIVITY MEASUREMENTS
Document Type and Number:
WIPO Patent Application WO/2017/142925
Kind Code:
A3
Abstract:
A method of performing an electromagnetic measurement of an earth formation includes disposing a downhole tool in a borehole in an earth formation, the downhole tool including an electrically conductive component, at least one electromagnetic transmitter located at a location along the tool, a first receiver located a first distance from the location, and a second receiver located at a second distance from the location. The method also includes applying a single rectangular current pulse having a substantially constant amplitude to the transmitter to generate an electric current in the formation, the current pulse having a specified time duration ΔT. The method further includes measuring transient signals during a time period subsequent to the time in response to the generated current, combining the transient signals to generate a combined transient signal, and estimating a resistivity of the formation based on the combined transient signal.
Inventors:
ITSKOVICH GREGORY (US)
Application Number:
PCT/US2017/017934
Publication Date:
July 26, 2018
Filing Date:
February 15, 2017
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
G01N27/04; G01N27/90; G01N33/24
Domestic Patent References:
| WO2016007307A1 | 2016-01-14 |
Foreign References:
| US20140029382A1 | 2014-01-30 | |||
| US20160033671A1 | 2016-02-04 | |||
| US8542553B2 | 2013-09-24 | |||
| US8373412B2 | 2013-02-12 |
Other References:
See also references of EP 3420347A4
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