Back to results
US 6,618,322 B1Granted
Method and apparatus for measuring acoustic mud velocity and acoustic caliper
AssigneeBaker Hughes Incorporated
InventorDan T. Georgi
Life of this patent
Estimating the term…
Abstract
A method and apparatus for determining acoustic mud velocity and bore hole caliper in a downhole environment. A highly accurate acoustic signal is adjusted for mud velocity as continuously measured. The borehole standoff is utilized to compensated data collected downhole in determining a parameter of interest in the wellbore or an adjacent formation.
Claims34
A downhole tool for measuring borehole standoff comprising:
- a transducer mounted on the tool for emitting a signal and detecting reflections of the emitted signal;
- a fixed target for reflecting a first portion of the emitted signal back to the transducer;
- a deflector for deflecting a second portion of the emitted signal toward a borehole wall and deflecting a reflection off the borehole wall of the second portion of the signal back to the transducer;
- and
- a processor for determining a distance from the transducer to the borehole wall.
2 more elements
A downhole tool for measuring borehole standoff comprising:
- a recessed transducer mounted on the tool for emitting a signal and detecting reflections of the emitted signal;
- a fixed target displaced longitudinally along the tool body from the transducer for reflecting a first portion of the emitted signal back to the transducer for determining mud velocity;
- and
- a processor for determining the distance from the transducer to the borehole wall,
- wherein the distance to the borehole wall is adjusted for changes in mud velocity.
2 more elements
A method for measuring borehole standoff downhole comprising:
- emitting a signal from a transducer and detecting at the transducer reflections of the emitted signal;
- reflecting from a fixed target, a first portion of the emitted signal back to the transducer;
- deflecting a second portion of the emitted signal toward the borehole wall and deflecting a reflection off the borehole wall of the second portion of the signal back to the transducer;
- and
- determining the distance from the transducer to the borehole wall.
2 more elements
A method for measuring borehole standoff downhole comprising:
- emitting a signal from a transducer and detecting reflections at the transducer of the emitted signal to determine mud velocity;
- reflecting a first portion of the emitted signal back to the transducer from a target displaced longitudinally along the tool body from the transducer;
- and
- determining the distance from the transducer to the borehole wall, wherein the computed distance to the borehole wall is adjusted for changes in mud velocity.
1 more element
Dependencies are inferred from the claim text.