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- W2012183515 abstract "Abstract New sensors have been developed for measuring in-situ fluid density that are based on the natural vibration of a structural member in contact with fluids being sampled using a wireline pumpout formation tester. Typically, a fluid-conveying tube is driven to its natural frequency and the frequency changes with fluid density. This design has the potential to greatly enhance the downhole fluid density measurement capability. However, the physical characterization and subsequent calibration of the sensor had to be proven for the harsher downhole environment. Although the principle for the vibrating density sensor is simple, a long list of factors, such as temperature, pressure, and tension, directly or indirectly affect the response of the sensor. Experimental correlations are typically used to calibrate this type of sensor. However, in this paper, we systemically study all of these factors and derive a differential equation that fully describes the physics of the vibrating tube densitometer based entirely on first principles. This is followed by the solution of the equation and its subsequent application to laboratory test results as part of the sensor calibration process. Comparisons between theoretically predicted density values for various fluids and their known fluid density values show this method to be more robust than previous correlations methods. An accuracy of better than +/- 0.002 gm/cm3 over the pressure range of 0 to 20,000 psi and a temperature range of 75 to 350°F under controlled conditions is achievable. The resolution of the sensor can also be better than 0.001 gm/cm3. Experimental results and field examples are presented to demonstrate the accuracy and resolution of the sensor." @default.
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- W2012183515 date "2009-10-04" @default.
- W2012183515 modified "2023-10-16" @default.
- W2012183515 title "Improved Accuracy in the Measurement of Downhole In-Situ Fluid Density" @default.
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- W2012183515 doi "https://doi.org/10.2118/124032-ms" @default.
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