Systems and methods for removing coherent noise in log data
US9903973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2014 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Jul 7, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/324
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.