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US 2016/0108721 A1Published application
Method and apparatus for investigating a borehole with a caliper
AssigneeLoadtest, Inc.
InventorJohn A. Hayes
Life of this patent
Estimating the term…
Abstract
Embodiments of the present invention relate to a caliper and method for mapping the dimensions and topography of a formation such as the sidewall of a borehole. Examples of formations in which embodiments of the invention can be used include, but are not limited to, an oil, gas, pile borehole or barrette that has been drilled or excavated into the earth.
Claims20
An apparatus for investigating a formation, comprising:
- a caliper adapted to be lowered into a formation such that an axis of the caliper is substantially parallel with the longitudinal axis of the formation,
- wherein the caliper comprises:
- a transmitter for transmitting a transmitted pulse signal;
- a detector for detecting a reflected pulse signal,
- wherein the reflected pulse signal is the transmitted pulse signal reflected from a target location on a surface of the formation onto which the transmitted pulse signal is incident;
- a means for determining the time interval between the transmission of the transmitted pulse signal and the detection of the reflected pulse signal,
- wherein the distance from the transmitter to the target location on the surface of the formation and back to the detector is the time interval between the transmission of the transmitted pulse signal and the detection of the reflected pulse signal times the speed of the first pulse signal;
- and
- a means for rotating the transmitter and the detector with respect to the axis of the caliper,
- wherein rotation of the transmitter and the detector causes the target location on the surface of the formation onto which the transmitted pulse signal is incident to rotate with respect to the axis of the caliper.
7 more elements
The apparatus according 1, further comprising:
- a means for raising and lowering the caliper in the formation,
- wherein raising and lowering the caliper in the formation causes the target location on the surface of the formation to raise and lower, respectively.
A method for investigating a formation, comprising:
- positioning a caliper into a formation such that an axis of the caliper is substantially parallel with the longitudinal axis of the formation;
- transmitting a transmitted pulse signal from a transmitter on the caliper;
- detecting a reflected pulse signal with a detector on the caliper,
- wherein the reflected pulse signal is the transmitted pulse signal reflected from a target location on a surface of the formation onto which the transmitted pulse signal is incident;
- determining the time interval between the transmission of the transmitted pulse signal and the detection of the reflected pulse signal,
- wherein the distance from the transmitter to the target location on the surface of the formation and back to the detector is the time interval between the transmission of the transmitted pulse signal and the detection of the reflected pulse signal times the speed of the first pulse signal;
- and
- rotating the transmitter and the detector with respect to the axis of the caliper,
- wherein rotation of the transmitter and the detector causes the target location on the surface of the formation onto which the transmitted pulse signal is incident to rotate with respect to the axis of the caliper.
6 more elements
Dependencies are inferred from the claim text.