System and method for sensing pressure using an inductive element
AssigneeChevron U.S.A. Inc.
InventorsDon M. Coates, David W. Beck, M. Clark Thompson
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Abstract
Exemplary systems and method are directed to a sensing device, and to a pressure sensing system and method. An exemplary method includes supplying electromagnetic energy to a transducer which is configured to reflect the electromagnetic energy at a ring frequency determined by an inductance of the transducer, wherein the inductance changes in response to compression of the inductive element. The ring frequency of electromagnetic energy reflected by the transducer is correlated to a pressure value.
Claims14
A system for sensing pressure in a borehole, comprising:
- means for generating electromagnetic energy;
- and
- means for frequency modulating the electromagnetic energy, wherein the
- modulating means includes an inductive element positioned remotely from the means for generating electromagnetic energy and which comprises:
- a shaped elastomer;
- and
- ferromagnetic material embedded as discrete particles within the shaped elastomer, wherein a percentage by weight of the ferromagnetic particles is selected such that an inductance of the shaped elastomer will vary a predetermined amount for a given compression of the shaped elastomer.
A method of sensing pressure using a transducer having a compressible inductive element, the method comprising:
- supplying electromagnetic energy to a transducer which is configured to reflect the electromagnetic energy at a ring frequency determined by an inductance of the transducer, wherein the inductance changes in response to compression of the inductive element;
- and
- correlating the ring frequency of electromagnetic energy reflected by the transducer to a pressure value.
A system for sensing pressure in a borehole, comprising:
- a signal generator electrically coupled to borehole tubing and configured to generate an electrical signal for transmission via the borehole tubing;
- a downhole transducer coupled to the borehole tubing and configured to at least modulate at least a portion of the electrical signal, the downhole transducer including an inductive element having a shaped elastomer with a ferromagnetic material embedded therein as discrete particles, wherein a percentage by weight of the ferromagnetic particles is selected such that an inductance of the shaped elastomer will vary a predetermined amount for a given compression of the shaped elastomer.
Dependencies are inferred from the claim text.