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Title: Shear wave transducer for boreholes

Abstract

A technique and apparatus is provided for estimating in situ stresses by measuring stress-induced velocity anisotropy around a borehole. Two sets each of radially and tangentially polarized transducers are placed inside the hole with displacement directions either parallel or perpendicular to the principal stress directions. With this configuration, relative travel times are measured by both a pulsed phase-locked loop technique and a cross correlation of digitized waveforms. The biaxial velocity data are used to back-calculate the applied stress.

Inventors:
Issue Date:
OSTI Identifier:
5844348
Application Number:
ON: DE85011662
Assignee:
Dept. of Energy EDB-85-087926
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; TRANSDUCERS; DESIGN; BOREHOLES; SHEAR; SONIC LOGGING; STRESSES; CAVITIES; WELL LOGGING; 440400* - Well Logging Instrumentation

Citation Formats

Mao, N.H. Shear wave transducer for boreholes. United States: N. p., 1984. Web.
Mao, N.H. Shear wave transducer for boreholes. United States.
Mao, N.H. Thu . "Shear wave transducer for boreholes". United States.
@article{osti_5844348,
title = {Shear wave transducer for boreholes},
author = {Mao, N.H.},
abstractNote = {A technique and apparatus is provided for estimating in situ stresses by measuring stress-induced velocity anisotropy around a borehole. Two sets each of radially and tangentially polarized transducers are placed inside the hole with displacement directions either parallel or perpendicular to the principal stress directions. With this configuration, relative travel times are measured by both a pulsed phase-locked loop technique and a cross correlation of digitized waveforms. The biaxial velocity data are used to back-calculate the applied stress.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {8}
}