Shear wave transducer for stress measurements in boreholes
Patent
·
OSTI ID:866134
- Castro Valley, CA
A technique and apparatus 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 is used to back-calculate the applied stress.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4641520
- OSTI ID:
- 866134
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/73/367/
anisotropy
apparatus
applied
back-calculate
biaxial
borehole
boreholes
configuration
correlation
data
digitized
directions
displacement
estimating
inside
loop
measured
measurements
measuring
measuring stress
parallel
perpendicular
phase-locked
phase-locked loop
placed
placed inside
polarized
principal
pulsed
radially
relative
sets
shear
shear wave
situ
stress
stress measurements
stress-induced
stresses
tangentially
technique
times
transducer
transducers
travel
travel time
velocity
velocity anisotropy
wave
wave transducer
waveforms
anisotropy
apparatus
applied
back-calculate
biaxial
borehole
boreholes
configuration
correlation
data
digitized
directions
displacement
estimating
inside
loop
measured
measurements
measuring
measuring stress
parallel
perpendicular
phase-locked
phase-locked loop
placed
placed inside
polarized
principal
pulsed
radially
relative
sets
shear
shear wave
situ
stress
stress measurements
stress-induced
stresses
tangentially
technique
times
transducer
transducers
travel
travel time
velocity
velocity anisotropy
wave
wave transducer
waveforms