Method for analyzing fluid properties
AssigneeBaker Hughes Incorporated
InventorTobias Kischkat
Life of this patent
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Abstract
A method for determining a property of a fluid includes: receiving at a computing device an admittance spectrum created by application of an excitation to a resonator contacting the fluid, the spectrum covering a first frequency range and having real and imaginary components; determining a resonant frequency of the admittance spectrum, the resonant frequency being a frequency at which a magnitude of the imaginary component is about zero; determining a bandwidth of the spectrum; and determining the property based on one or both of the resonant frequency and the bandwidth of the resonant frequency.
Claims28
A method for determining a property of a fluid, the method comprising:
- receiving at a computing device an admittance spectrum created by application of an excitation to a resonator contacting the fluid, the spectrum covering a first frequency range and having real and imaginary components;
- determining a resonant frequency of the admittance spectrum, the resonant frequency being a frequency at which a magnitude of the imaginary component is about zero;
- determining a bandwidth of the spectrum;
- and
- determining the property based on one or both of the resonant frequency and the bandwidth of the resonant frequency.
A system for determining a property of a downhole fluid, the system comprising:
- a downhole component including a resonator that can be immersed in the downhole fluid;
- and
- a computing device in operative communication with the downhole component and configured to:
- receive an admittance spectrum created by application of an excitation to the, the spectrum covering a first frequency range and having real and imaginary components;
- determine a resonant frequency of the admittance spectrum, the resonant frequency being a frequency at which a magnitude of the imaginary component is about zero;
- determine a bandwidth of the spectrum;
- and
- determine the property based on one or both of the resonant frequency and the bandwidth of the resonant frequency.
A method of estimating a property of a fluid downhole, the method comprising:
- determining a first admittance spectrum values for a resonator immersed in a fluid down hole as a ratio of electrical output current over input voltage over a first frequency range to form a first admittance spectrum;
- determining a first resonant frequency and a first bandwidth for the first admittance spectrum;
- determining second admittance spectrum values for the resonator immersed in the fluid down hole as a ratio of electrical output current over input voltage over a second frequency range to form a second admittance spectrum, the second frequency range including the first resonant frequency and the first bandwidth;
- determining a second resonant frequency and a second bandwidth for the second admittance spectrum;
- and
- estimating the property for the fluid downhole from the second resonant frequency and the second bandwidth.
A system for determining a property of a downhole fluid, the system comprising:
- a downhole component including a resonator that can be immersed in the downhole fluid;
- and
- a computing device in operative communication with the downhole component and configured to:
- determine a first admittance spectrum values for a resonator immersed in a fluid down hole as a ratio of electrical output current over input voltage over a first frequency range to form a first admittance spectrum;
- determine a first resonant frequency and a first bandwidth for the first admittance spectrum;
- determine second admittance spectrum values for the resonator immersed in the fluid down hole as a ratio of electrical output current over input voltage over a second frequency range to form a second admittance spectrum, the second frequency range including the first resonant frequency and the first bandwidth;
- determine a second resonant frequency and a second bandwidth for the second admittance spectrum;
- and
- estimate the property for the fluid downhole from the second resonant frequency and the second bandwidth.
Dependencies are inferred from the claim text.