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1. (WO2018125114) ROTATING SPECTRAL DENSITY TOOL FOR BEHIND PIPE EVALUATION

Pub. No.:    WO/2018/125114    International Application No.:    PCT/US2016/069099
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 30 00:59:59 CET 2016
IPC: E21B 47/00
G01V 11/00
G01V 1/40
G01V 5/12
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: FOX, Philip Edmund
SUPARMAN, Fnu
FRISCH, Gary James
ENGLAR, Michael Jason
Title: ROTATING SPECTRAL DENSITY TOOL FOR BEHIND PIPE EVALUATION
Abstract:
A method includes introducing a tool string into a wellbore having material disposed in an annular region surrounding the casing. Obtaining acoustic refracted waveform measurements of the material from a cement bond logging tool, obtaining ultrasonic measurements of the material from a circumferential acoustic scanning tool, obtaining gamma radiation measurements scattered from the material from a circumferential spectral density logging (RSDX) tool by emitting gamma radiation from a radioactive source in a rotating portion of the RSDX and detecting scattered gamma radiation using near and far spectral density detectors, and obtaining thermal neutron radiation measurements scattered from the material from a dual spaced neutron logging tool. A computer obtains measurements and generates a deliverable that includes one or more cross plots that identify a compositional equivalent of the material in an entire circumference of the wellbore.