Method and apparatus for sensing a borehole characteristic
AssigneeChevron U.S.A. Inc.
InventorsM. Clark Thompson, Koby Carlson, Don M. Coates, Manuel E. Gonzalez, Brian C. Llewellyn
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Abstract
An apparatus and method are disclosed for sensing a characteristic of a borehole. An exemplary apparatus includes a conductive pipe; an inlet, connected to the conductive pipe, for applying pulse to the conductive pipe; a resonant network device connected with the conductive pipe; and a transducer which is in operative communication with the resonant network device to measure a borehole characteristic, the transducer being configured to sense a modulated vibration frequency induced in the resonant network device when a pulse is applied to the inlet.
Claims25
Apparatus for sensing a characteristic of a borehole, comprising:
- a conductive pipe;
- an inlet coupled to the conductive pipe, for applying a pulse to the conductive pipe;
- a resonant network device connected with the conductive pipe;
- and a transducer in operative communication with the resonant network device to measure a borehole characteristic, the transducer being configured to affect a modulation of a resonator vibration frequency induced in the resonant network device when a pulse is applied to the inlet;
- and
- wherein the inlet further includes:
- a probe coupled with the conductive pipe;
- and
- an inductor for electrically isolating the inlet from a common ground potential at a location in a vicinity of the inlet, wherein the resonating means uses a magnetically coupled resonating network.
Apparatus for sensing a characteristic of a borehole comprising:
- means for conducting a pulse through a borehole, the means for conducting the pulse including an inlet, coupled to the conducting means, for conducting the pulse to the conducting means;
- means, responsive to the pulse, for resonating at a frequency which is modulated as a function of a characteristic of the borehole;
- and means for processing the modulated frequency as a measure of the characteristic;
- wherein the inlet further includes:
- a probe coupled with the conducting means;
- and
- an inductor for electrically isolating the inlet from a common ground potential at a location in a vicinity of the inlet, wherein the resonating means uses a magnetically coupled resonating network.
Method for sensing a characteristic of a borehole, comprising:
- transmitting a pulse along a conductive pipe located within the borehole, wherein transmitting the pulse comprises transmitting the pulse to an inlet coupled to the conductive pipe;
- and
- sensing a modulated vibration frequency induced by the pulse within a resonant network device within a hollow borehole casing, as a measure of the borehole characteristic;
- wherein the inlet further includes:
- a probe coupled with the conductive pipe;
- and
- an inductor for electrically isolating the inlet from a common ground potential at a location in a vicinity of the inlet, wherein the resonating means uses a magnetically coupled resonating network.
Apparatus for sensing a characteristic of a borehole, comprising:
- a conductive pipe;
- an inlet coupled to the conductive pipe, for applying a pulse to the conductive pipe;
- a resonant network device connected with the conductive pipe wherein the resonant network device is a resonant cavity located within a hollow borehole casing, a length of the resonant cavity within the hollow borehole casing being defined by an inductive isolator at a first end, and by a common ground connection at a second end;
- and
- a transducer which is in operative communication with the resonant network device to measure a borehole characteristic, the transducer being configured to affect a modulation of a resonator vibration frequency induced in the resonant network device when a pulse is applied to the inlet.
Dependencies are inferred from the claim text.