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首页> 外文期刊>International Journal of Thermophysics >A Vibrating Plate Fabricated by the Methods of Microelectromechanical Systems (MEMS) for the Simultaneous Measurement of Density and Viscosity: Results for Argon at Temperatures Between 323 and 423K at Pressures up to 68 MPa
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A Vibrating Plate Fabricated by the Methods of Microelectromechanical Systems (MEMS) for the Simultaneous Measurement of Density and Viscosity: Results for Argon at Temperatures Between 323 and 423K at Pressures up to 68 MPa

机译：通过微机电系统（MEMS）方法制造的用于同时测量密度和粘度的振动板：在压力高达68 MPa时，温度在323至423K之间的氩气结果

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In the petroleum industry, measurements of the density and viscosity of petroleum reservoir fluids are required to determine the value of the produced fluid and the production strategy. Measurements of the density and viscosity of petroleum fluids require a transducer that can operate at reservoir conditions, and results with an uncertainty of about ±1% in density and ±10% in viscosity are needed to guide value and exploitation calculations with sufficient rigor. Necessarily, these specifications place robustness as a superior priority to accuracy for the design. A vibrating plate, with dimensions of the order of 1 mm and a mass of about 0.12 mg, clamped along one edge, has been fabricated, with the methods of Microelectromechanical (MEMS) technology, to provide measurements of both density and viscosity of fluids in which it is immersed. The resonance frequency (at pressure p = 0 is about 12 kHz) and quality factor (at p = 0 is about 2800) of the first order bending (flexural) mode of the plate are combined with semi-empirical working equations, coefficients obtained by calibration, and the mechanical properties of the plate to provide the density and viscosity of the fluid into which it is immersed. When the device was surrounded by argon at temperatures between 348 and 423 K and at pressures between 20 and 68 MPa, the density and viscosity were determined with an expanded (k = 2) uncertainty, including the calibration, of about ±0.35% and ±3%, respectively. These results, when compared with accepted correlations for argon reported in the literature, were found to lie within ±0.8% for density and less than ±5% for viscosity of literature values, which are within a reasonable multiple of the relative combined expanded (k = 2) uncertainty.
机译：在石油工业中，需要测量石油储层流体的密度和粘度，以确定产出液的价值和生产策略。石油流体的密度和粘度的测量需要一个可以在储层条件下运行的传感器，并且需要具有约±1％的密度和±10％的粘度的不确定性的结果，以足够严格地指导价值和开采计算。必要时，这些规格将坚固性作为设计精度的首要任务。使用微机电（MEMS）技术的方法，制造了一块振动板，尺寸为1 mm量级，质量为约0.12 mg，沿着一条边缘夹紧，可以测量流体中的密度和粘度。浸入其中。平板的一阶弯曲（弯曲）模式的共振频率（在压力p = 0时约为12 kHz）和品质因数（在p = 0时约为2800）与半经验工作方程结合，系数为校准，以及板的机械性能，以提供其所浸入的流体的密度和粘度。当设备在348至423 K的温度和20至68 MPa的压力下被氩气包围时，密度和粘度的确定不确定性（k = 2）扩大，包括校准在内，不确定度约为±0.35％和±分别为3％。与文献中报道的氩的公认相关性相比，这些结果的密度值在±0.8％范围内，粘度值在文献值的范围内小于±5％，这在相对组合膨胀系数（k = 2）不确定性。

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