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Conductivity measurements

A technology of conductivity and resonant frequency, which is applied in the field of measurement system, can solve problems such as fuzzy measurement values ​​and achieve improved measurement results

Active Publication Date: 2015-10-28
ROXAR FLOW MEASUREMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, the measured value is ambiguous

Method used

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  • Conductivity measurements
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Examples

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Embodiment Construction

[0033] Figure 1a Shown is a conical insert 1 used as a resonator in a tube 2 comprising a coupling device 3 as discussed in WO2010 / 115883 above. The coupling device 3 can be configured as a probe, which is used to apply and / or induce an electromagnetic field in order to determine the resonance frequency and the Q-factor. Figure 1b The frequency response of a typical conical insert over a frequency range including the two resonant frequencies 4, 5 is shown. Typical tube diameters may be in the range of 50mm and 245mm, but this tube diameter may vary from case to case.

[0034] Figure 2a An alternative resonator consisting of fins 6 extending into the flow is shown. Figure 2b The two first resonance peaks are shown in this configuration based on an inner tube diameter of 146.4 mm and a fin length of approximately one tube diameter.

[0035] Various configurations are conceivable, as will be apparent to those skilled in the art. A flat, unobstructed tube has a single reso...

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Abstract

The present invention relates to a system for measuring conductivity in a multiphase fluid flow comprising a fraction of water, the system comprising a measuring section including means for emitting electromagnetic signals into a pipe containing said flow within at least one chosen frequency range and means for detecting resonant frequencies within said range. The measuring section comprising features for providing at least two resonanct frequencies within said at least one frequency range, the system also comprising means for based on at least a first resonant frequency and a first Q-factor related to the corresponding resonance peak as well as the Q-factor of a second resonance peak, calculating the conductivity of the water in said flow.

Description

technical field [0001] The invention relates to a measurement system for measuring properties of a fluid flow, in particular a multiphase fluid flow comprising a portion of water. Background technique [0002] In oil and gas production and processing, it is necessary to monitor the content and properties of the fluid streams because the oil, gas and water fractions and water salinity will change during production and affect further processing. Various types of techniques have been used to sample the information necessary to discover fractions and salinity, such as acoustic measurements, pressure, gamma rays, and electrical measurements. The invention relates to electrical measurements which are used to determine the content in mixtures of oil, gas and water, and in particular to determine the conductivity of water in a stream, thus indicating the salinity and / or water content in the stream . Dissolved salts in water make the water conductive. Conductivity depends on the a...

Claims

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Application Information

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IPC IPC(8): G01N33/28G01N22/00
CPCG01N33/2847G01F1/58G01F1/582G01N22/00
Inventor 埃伯·古斯塔夫·耐福斯
Owner ROXAR FLOW MEASUREMENT
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