Acoustic-electric dual-mode measurement method for oil-gas-water three-phase flow separation phase velocity

Abstract

The invention relates to an acoustic and electric bimodal measurement method for a separate phase flow rate of an oil-gas-water three-phase flow. The method comprises following steps: taking an oil-gas-water three-phase water base-dispersion flow as the object, using an electrical sensor to collect a water phase content rate signal, and using a continuous wave ultrasonic sensor to collect a Doppler frequency shift signal; using the feature extraction and the classification algorithm to identify the flow type of an oil-gas-water three-phase flow according to the de-noized measurement data of the water phase content rate of the electrical sensor; extracting the local fluctuation characteristics of the water phase content rate signal; decomposing the continuous wave ultrasonic Doppler frequency shift signal and selecting a principal component through ensemble empirical mode decomposition; using a ultrasonic-electrical conjoint analysis method to obtain the corresponding relationship between the water phase content rates under different flow types and different fluctuation scales in the Doppler frequency shift signal; performing fast Fourier transformation on the corresponding eigenmode function where the separate phase flow rate information is reflected under different flow types, and calculating the average Doppler frequency shift; and calculating the separate phase flow rate according to the basic principle of the Doppler effect.

Description

technical field

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

[0002] technical background

[0003] The oil-gas-water three-phase flow is the three-component flow in the gas / liquid / liquid three-phase flow, which widely exists in the process of oil extraction and transportation. In recent years, oil fields have entered a period of high water cut, and oil-gas-water three-phase flow mostly uses water as the continuous phase, and oil droplets and air bubbles flow together with the continuous phase as discrete phases. The measurement of its flow parameters has become a hot issue in the field of multiphase flow research, especially the measurement of phase holdup and flow velocity is of great significance for accurate estimation of production and guarantee of producti...

Examples

Embodiment Construction

[0029] Embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0030] figure 1 It is a structural schematic diagram of the ultrasonic and electrical dual-mode measurement system in the measurement method of the present invention. The electrical sensor is described by taking a conductance ring sensor as an example. The measurement system consists of a group of electrical sensor arrays 2 installed on the experimental pipe section 1 and an electrical signal generation and acquisition unit 4 connected thereto, a group of ultrasonic sensor arrays 3 and an ultrasonic signal generation and acquisition unit 6 connected thereto. The electrical sensor array 2 is composed of four ring-shaped metal electrodes embedded in the inner wall of the pipeline at certain intervals; the ultrasonic sensor array 3 is composed of a group of dual-crystal ultrasonic transducers with integrated transceiver installed on the same side of the pipeline. Th...

technical field

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

[0002] technical background

[0003] The oil-gas-water three-phase flow is the three-component flow in the gas / liquid / liquid three-phase flow, which widely exists in the process of oil extraction and transportation. In recent years, oil fields have entered a period of high water cut, and oil-gas-water three-phase flow mostly uses water as the continuous phase, and oil droplets and air bubbles flow together with the continuous phase as discrete phases. The measurement of its flow parameters has become a hot issue in the field of multiphase flow research, especially the measurement of phase holdup and flow velocity is of great significance for accurate estimation of production and guarantee of producti...

Examples

Embodiment Construction

[0029] Embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0030] figure 1 It is a structural schematic diagram of the ultrasonic and electrical dual-mode measurement system in the measurement method of the present invention. The electrical sensor is described by taking a conductance ring sensor as an example. The measurement system consists of a group of electrical sensor arrays 2 installed on the experimental pipe section 1 and an electrical signal generation and acquisition unit 4 connected thereto, a group of ultrasonic sensor arrays 3 and an ultrasonic signal generation and acquisition unit 6 connected thereto. The electrical sensor array 2 is composed of four ring-shaped metal electrodes embedded in the inner wall of the pipeline at certain intervals; the ultrasonic sensor array 3 is composed of a group of dual-crystal ultrasonic transducers with integrated transceiver installed on the same side of the pipeline. Th...

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