Patent Number: 7,710,823

Title: Resistivity measurement through metal casing using magnetic field and magnetoacoustic phenomena

Abstract: Measurements of acoustic velocities are made through a case borehole in the absence and presence of an applied magnetic field. A formation resistivity parameter may be estimated from differences in the acoustic velocities.

Inventors: Tabarovsky; Leonty A. (Cypress, TX), Dorovsky; Vitaly N. (Novosibirsk, RU), Nefedkin; Yuriy A. (Novosibirsk, RU), Imomnazarov; Kholmatzhon (Novosibirsk, RU)

Assignee: Baker Hughes Incorporated

International Classification: G01V 1/00 (20060101); G01V 3/00 (20060101)

Expiration Date: 5/04/12018