公开(公告)号：US20170082767A1

公开(公告)日：2017-03-23

申请号：US15269052

申请日：2016-09-19

Applicant: PETROLEO BRASILEIRO S.A. - PETROBRAS

Inventor： Candida Menezes de JESUS ,  Andre Luiz Martins COMPAN ,  Rodrigo SURMAS

IPC: G01V1/48

CPC classification number: G01V1/48 ,  E21B47/0002 ,  E21B47/082 ,  G01V1/44 ,  G01V2210/54 ,  G01V2210/59

Abstract: This invention relates to a method of correcting eccentricity of ultrasonic image profiles, measured along a section of rock, including the steps of measuring emitted amplitude values (A0) and measuring transit time values (tθ) of ultrasonic acoustic pulses emitted at a range of default angles (θ), where the amplitude measured at each angle (Aθ) is determined by an amplitude decay model in relation to the transit time (tθ) defined by A θ=Aθ·etθ/τ·Iθ, where τ is the decay correction factor; and Iθ is the reflection coefficient of the rock wall.