Multiphase flow phase holdup measurement method, system and apparatus

By obtaining the parameters of the fluid in the flow state and calculating it, real-time detection of the three-phase phase content of oil, gas and water is achieved, solving the problems of low detection accuracy and low efficiency in the prior art, and meeting the demand for real-time online measurement of oil well production.

WO2025065943A1 Publication Date: 2025-04-03PETROCHINA CO LTD
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Patent Information

Application Number
PCT/CN2023/142645
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-28
Filing Date
2023-12-28
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

It is difficult for the prior art to realize real-time online detection of the three-phase content of oil, gas and water in the fluid, especially in the oil well production process, traditional methods have problems such as low accuracy, low efficiency, environmental pollution and safety risks.

Method used

By obtaining the flow rate of the fluid in the flow state, the real-time fluid liquid phase moisture content and the fluid liquid phase oil content, and based on the preset scale information, the volume content of the multiphase flow gas is calculated, and the multiphase flow phase content detection result is finally obtained. This method does not require the fluid to be stationary, real-time detection is achieved.

Benefits of technology

Real-time detection of the three-phase content of oil, gas and water in the fluid is achieved, meeting the demand for real-time online measurement of the flow rate of each phase of the fluid by the oil well, and improving the accuracy and efficiency of detection.

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Abstract

The present invention belongs to the technical field of multiphase flow measurement. Provided are a multiphase flow phase holdup measurement method, system and apparatus. The multiphase flow phase holdup measurement method comprises: acquiring a flow velocity of a fluid in a flowing state and a real-time liquid-phase water content of the fluid and liquid-phase oil content of the fluid; on the basis of preset scale information, the flow velocity, and the real-time liquid-phase water content of the fluid, calculating a multiphase flow gas volume content, the preset scale information comprising a magnetization vector of a pure oil fluid, a magnetization vector of a pure water fluid, a longitudinal relaxation time of the pure oil fluid and a longitudinal relaxation time of the pure water fluid; and, on the basis of the multiphase flow gas volume content and the real-time liquid-phase water content of the fluid and liquid-phase oil content of the fluid, obtaining a multiphase flow phase holdup measurement result. The present invention achieves real-time measurement of the phase holdup of oil, gas and water phases in a fluid and thus satisfies the requirement for real-time online measurement of the flow quantity of each phase of a fluid for an oil well, and also improves the accuracy of multiphase flow phase holdup measurement.
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