Method and apparatus for acoustic impedance and P-wave anisotropy measurements
AssigneeBaker Hughes Incorporated
InventorsSergey Egerev, Victor Yushin, Oleg Ovchinnikov, Vladimir Dubinsky, Xiao Ming Tang, Douglas J. Patterson
Life of this patent
Estimating the term…
Abstract
Measurements of impedance are made using a piezoelectric transducer oriented at different angles to a formation bedding plane. The impedance measurements are then used to estimate the anisotropic velocity of the formation.
Claims13
A method of evaluating an earth formation, the method comprising:
- conveying a logging tool into a borehole;
- exciting at least one transducer on the logging tool at a first orientation and a second orientation to the wall of the borehole;
- using a first measured impedance of the transducer at a first resonant frequency at the first orientation and a second measured impedance at a second resonant frequency at the second orientation for estimating a ratio of a compressional velocity of the formation at the first orientation and a compressional velocity of the formation at the second orientation;
- and
- using the estimated ratio of the compressional velocities for conducting further exploration of the formation.
An apparatus configured to evaluate an earth formation, the apparatus comprising:
- a logging tool configured to be conveyed into a borehole;
- at least one transducer on the logging tool configured to be excited at a first orientation and a second orientation to the wall of the borehole;
- a processor configured to:
- use a first measured impedance of the transducer at a first resonant frequency at the first orientation and a second measured impedance at a second resonant frequency at the second orientation to estimate a ratio of a compressional velocity of the formation at the first orientation and a compressional velocity of the formation at the second orientation;
- and
- use the estimated ratio of the compressional velocities for conducting further exploration of the formation.
A computer-readable medium having instructions thereon that when read by at least one processor cause the at least one processor to execute a method, the method comprising:
- using a first measurement of an impedance at a first resonant frequency of at least one transducer in contact with a wall of a borehole at a first orientation and a second measurement of an impedance at a second resonant frequency of the at least one transducer at a second orientation to estimate a ratio of the first impedance and the second impedance;
- and
- using the estimated ratio of the compressional velocities for conducting further exploration of the formation.
Dependencies are inferred from the claim text.