Velocity Measurement Method for Oil-Gas-Water Three-Phase Plug Dispersed Flow

Abstract

The invention relates to an oil gas water three-phase plugged dispersed flow velocity measuring method. The oil gas water three-phase plugged dispersed flow velocity measuring method comprises steps that 1) a phase holdup measuring device is used to acquire various phase holdup information; 2) a continuous phase and dispersed phases of a three-phase plugged dispersed flow are determined according to the phase holdup; 3) receiving signals acquired by an ultrasonic transducer are demodulated, and Doppler frequency shift is acquired; 4) drag force between the continuous phase and a dispersed gas phase is calculated; 5) the drag force between the continuous phase and a dispersed liquid phase is calculated; 6) shearing force of a tube wall applied to the continuous liquid phase is calculated; 7) ternary non-linear equations related to uc, ug, ud are established; 8) by adopting a numerical iteration type algorithm for solution, the optimal estimations of the uc, the ug, and the ud are acquired; 9) a three-phase flow split phase apparent velocity is calculated.

Description

technical field

[0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method of an ultrasonic sensor, which is used for the non-disturbance measurement of the velocity of an oil-gas-water three-phase plug-shaped dispersed flow.

[0002] technical background

[0003] Multiphase flow exists widely in daily life and industrial production processes, such as food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry, and its main manifestations include two-phase flow, three-phase flow or four-phase flow. Among them, oil-gas-water three-phase flow is the most common flow form in oil extraction and transportation. Compared with single-phase flow or two-phase flow, the flow state of three-phase flow is more complicated, so the online process parameter detection of three-phase flow has always been the focus of scientific research and industrial circles. The measurement of water cut and flow veloci...

Examples

Embodiment Construction

[0026] The calculation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] figure 1 Schematic diagram of an ultrasonic Doppler sensor in the measurement method of the present invention; a dual-crystal probe 1 is installed at the bottom of a pipeline 2 .

[0028] figure 2 It is a schematic diagram of the ultrasonic Doppler measurement space in the measurement method of the present invention; the dual-crystal probe is installed at the bottom of the pipeline and embedded in the 4-tube wall. The CW Doppler measurement space is defined as the overlapping area of ​​the sound field where the sound waves are transmitted and received. Inside the pipe 2 area, the overlapping area of ​​the two parts of the sound field is the shadow area 3, which is the measurement space. Velocity information of the discrete phases in the fluid flowing through this region can be acquired by ultrasonic Doppler sensors. The projectio...

technical field

[0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method of an ultrasonic sensor, which is used for the non-disturbance measurement of the velocity of an oil-gas-water three-phase plug-shaped dispersed flow.

[0002] technical background

[0003] Multiphase flow exists widely in daily life and industrial production processes, such as food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry, and its main manifestations include two-phase flow, three-phase flow or four-phase flow. Among them, oil-gas-water three-phase flow is the most common flow form in oil extraction and transportation. Compared with single-phase flow or two-phase flow, the flow state of three-phase flow is more complicated, so the online process parameter detection of three-phase flow has always been the focus of scientific research and industrial circles. The measurement of water cut and flow veloci...

Examples

Embodiment Construction

[0026] The calculation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] figure 1 Schematic diagram of an ultrasonic Doppler sensor in the measurement method of the present invention; a dual-crystal probe 1 is installed at the bottom of a pipeline 2 .

[0028] figure 2 It is a schematic diagram of the ultrasonic Doppler measurement space in the measurement method of the present invention; the dual-crystal probe is installed at the bottom of the pipeline and embedded in the 4-tube wall. The CW Doppler measurement space is defined as the overlapping area of ​​the sound field where the sound waves are transmitted and received. Inside the pipe 2 area, the overlapping area of ​​the two parts of the sound field is the shadow area 3, which is the measurement space. Velocity information of the discrete phases in the fluid flowing through this region can be acquired by ultrasonic Doppler sensors. The projectio...

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