Method for Determination of Phase Fraction of Multiphase Flow by Single Source Radiation

Abstract

The invention discloses a method for single-source ray measuring of multi-phase flow fractions. The method comprises the steps that firstly, a high-level single-source gamma ray is used for being irradiated to a scattering material and a metal target material at the same time, and X ray and low-level ray are obtained; after alignment is performed, the ray can be used for measuring the fractions; by adopting the multi-level gamma ray attenuation method, the multi-phase fractions alpha 1, alpha 2 and alpha 3 of oil, gas and water in the multi-phase flow can be worked out. According to the method for single-source ray measuring of the multi-phase flow fractions, the single high-energy gamma ray is adopted as a radioactive source, the metal target material is bombarded to generate the X ray, Compton scattering is performed to generate low-energy gamma ray, and therefore the purpose of generating two kinds of low-energy ray through the single-energy-level scattering source is achieved, and after alignment of the X ray and the low-energy gamma ray, multi-phase flow fraction measurement can be performed. The method has the remarkable effects of lowering the cost, reducing the radiation dosage and lowering the protective difficulty.

Description

Technical field [0001] The invention relates to a method for measuring the phase fraction of a multiphase flow, in particular to a method for measuring the phase fraction of a multiphase flow with a single source ray. Background technique [0002] Since the 1990s, more and more non-separable multiphase flow meters have gradually replaced the traditional bulky separators. The common basic technical route of non-separated multiphase flow meters is to measure the total flow (or velocity) and Single phase (oil, gas, water) phase fraction. Common methods for measuring phase fraction include gamma ray method, ultrasonic method, capacitance conductance method, microwave method, differential pressure densitometer method and other methods. [0003] Compared with other measurement methods, the multi-level gamma-ray absorption method has unique advantages. Multi-level gamma-ray absorption method is a non-contact multi-phase flow measurement technology. It can measure the water content and g...

AI Technical Summary

Problems solved by technology

[0004] In recent years, with the sharp drop in international crude oil prices, market competition has intensified, and product upgrading has been further accelerated; most of the current isotope meters use 137 Cs, 133 Ba, 241 Am and other radioactive sources, of which 137 Cs, and 133 Ba will produce high-energy rays, which are difficult to protect and have low measurement accuracy

241 Am belongs to low energy, but there is only one kind of energy, and it can only measure the thickness of the object, the moisture content of the material or the phase fraction of the two-phase medium, etc.

However, to measure the phase separation ratio of a three-phase medium, at least two types of energy rays are required. The existing technical means are realized by setting two radioactive sources; the structure is more complex, the radiation dose is high, the cost is high, and the protection is difficult. question

[0005] In the medical industry, there are some studies on the scattering of gamma rays, but its application to the determination of the phase fraction of multiphase flow has not been reported

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