Patent ID: 9171356
Filing Date: 2015-10-27
Classification: G01V,G06T

Abstract:
1. A method for automatically removing cyclic noise from a logging while drilling image downhole during a logging while drilling operation, the method comprising: (a) acquiring a borehole image; (b) transforming at least one vertical section of the image acquired in (a) into a frequency domain using a one-dimensional transform to obtain a power spectrum of the image; (c) evaluating the power spectrum obtained in (b) for cyclic noise peaks; (d) creating a two-dimensional filter using the cyclic noise peak(s) evaluated in (c); (e) transforming the borehole image acquired in (a) into a frequency domain using a two-dimensional transform to obtain a transformed image; (f) filtering the transformed image obtained in (e) using the filter created in (d) to obtain a filtered transformed image; and (g) inverse transforming the filtered transformed image obtained in (f) using a two-dimensional inverse transform to obtain a corrected image.