Invention Grant
- Patent Title: Systems and methods for removing coherent noise in log data
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Application No.: US14566638Application Date: 2014-12-10
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Publication No.: US09903973B2Publication Date: 2018-02-27
- Inventor: Gaelle Jannin , Andrew J. Hayman , Thomas Barrou , Sylvain Thierry
- Applicant: Schlumberger Technology Corporation
- Applicant Address: US TX Sugar Land
- Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
- Current Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
- Current Assignee Address: US TX Sugar Land
- Agent Michael Dae
- Priority: EP13306856 20131223
- Main IPC: G01V1/46
- IPC: G01V1/46 ; G01V1/48

Abstract:
Methods and devices for obtaining well log data with reduced coherent noise are provided. One such method may include placing a downhole tool into a well to obtain a set of unfiltered well log data that includes individual measurements obtained at various azimuthal angles within the well. Some of the unfiltered well log data may represent eccentered well log data obtained while the downhole tool is eccentered in the well. The individual measurements of the eccentered well log data may have delays that vary as a function of the azimuthal angle at which they were obtained. By comparing the measurements of the eccentered well log data, a common pattern independent of delay, representing coherent noise, may be identified. The common pattern may be subtracted from the well log data to produce filtered well log data that is less noisy than the unfiltered well log data.
Public/Granted literature
- US20150177405A1 Systems and Methods for Removing Coherent Noise in Log Data Public/Granted day:2015-06-25
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