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1. (WO2018125509) TECHNIQUES FOR EVALUATING BOREHOLE SUBSURFACE GEOLOGIES USING STONELEY WAVES

Pub. No.:    WO/2018/125509    International Application No.:    PCT/US2017/064007
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 01 00:59:59 CET 2017
IPC: E21B 47/00
G01V 1/52
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: HORNBY, Brian Edward
COLLINS, Mark Vincent
Title: TECHNIQUES FOR EVALUATING BOREHOLE SUBSURFACE GEOLOGIES USING STONELEY WAVES
Abstract:
A method evaluating borehole subsurface geologies can include receiving a total response signal by a sensor array disposed in a borehole, the response signal represents a pressure wave propagating in the borehole. A secondary signal can be extracted from the total response signal and a depth location for at least one secondary source that corresponds to the secondary signal is determined. An estimated reflectivity response for the secondary signal as a function of frequency is determined and the estimated reflectivity response is inverted to determine the secondary source includes at least one of a potential fracture or a potential washout. The at least one of a fracture conductivity or a washout volume for the secondary source is compared to one or more borehole images corresponding to the depth location of the secondary source to determine the potential fracture is an actual fracture or the potential washout is an actual washout.