Shear wave transducer for stress measurements in boreholes

Patent · Tue Feb 10 00:00:00 EST 1987

OSTI ID:7063202

Mao, N H

A method is described for determining stress around a borehole, comprising: generating a radially polarized shear wave in the borehole at two positions spaced apart by 90/sup 0/; transmitting the radially polarized shear waves in a direction along the borehole; measuring the velocity of the radially polarized shear waves; generating a tangentially polarized shear wave in the borehole at two positions spaced apart by 90/sup 0/; transmitting the tangentially polarized shear waves in a direction along the borehole; measuring the velocity of the tangentially polarized shear waves; calculating the stress induced shear wave velocity anisotropy from the measured velocities; and calculating the stress from the shear wave velocity anisotropy according to a predetermined relationship.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4641520
• OSTI ID: 7063202
• Resource Relation: Patent File Date: Filed date 23 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
BOREHOLES
STRESSES
NATURAL GAS DEPOSITS
SEISMIC SURVEYS
PETROLEUM DEPOSITS
TRANSDUCERS
ANISOTROPY
CALCULATION METHODS
INCIDENCE ANGLE
PHASE VELOCITY
POLARIZATION
POSITIONING
SEISMIC S WAVES
SPACE DEPENDENCE
WAVE PROPAGATION
CAVITIES
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
MINERAL RESOURCES
RESOURCES
SEISMIC WAVES
SURVEYS
VELOCITY
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
580203 - Geophysics- Geophysical Survey Methods- (1980-1989)