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US 10,295,449 B2Granted
Determining resonance frequency and quality factor
AssigneeSchlumberger Technology Corporation
InventorsKai Hsu, Florian Risser, Gocha Chochua, Haitao Zhang
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for obtaining data from a density-viscosity (DV) sensor of a downhole tool, wherein the DV sensor comprises a resonating element disposed in a fluid flowing in a flowline of the downhole tool, and determining a resonance frequency and quality factor of the resonating element utilizing a nonlinear regression and/or a plurality of resonance modes exhibited by the obtained data.
Claims20
A method, comprising:
- deploying a downhole tool into a wellbore, said downhole tool comprises a density viscosity (DV) sensor having a resonating element disposed in a flowline of the downhole tool;
- exciting the density viscosity (DV) sensor and obtaining data corresponding to a first resonance mode and a second resonance mode during a flow of a fluid in the flowline of the downhole tool;
- in a processor, fitting the data to an equation, wherein the equation comprises a first term corresponding to the first resonance mode and a second term corresponding to the second resonance mode;
- and
- in the processor, determining, based at least in part on the equation, a first resonance frequency and a first quality factor of the resonating element in the fluid corresponding to the first resonance mode and a second resonance frequency and a second quality factor of the resonating element in the fluid corresponding to the second resonance mode, wherein the first resonance frequency, the first quality factor, the second resonance frequency, and the second quality factor are indicative of properties of the fluid.
2 more elements
An apparatus, comprising:
- a downhole tool operable within a wellbore extending from a wellsite surface into a subterranean formation, wherein the downhole tool comprises:
- a flowline for conducting fluid obtained from the subterranean formation via operation of the downhole tool;
- a density-viscosity (DV) sensor comprising a resonating element disposed in the flowline;
- and
- surface equipment disposed at the wellsite surface and in communication with the downhole tool, wherein at least one of the downhole tool and the surface equipment comprises a processor operable to:
- receive electrical signals corresponding to a movement of the resonating element;
- fit the movement of the resonating element to an equation, wherein the equation comprises a first term corresponding to a first resonance mode and a second term corresponding to a second resonance mode;
- and
- determine a resonance frequency and a quality factor of the resonating element in the fluid for each of the first resonance mode and the second resonance mode, wherein the resonance frequency and the quality factor are indicative of properties of the fluid.
6 more elements
Dependencies are inferred from the claim text.