Process tomography of oil-water two-phase flow based on electromagnetic-acoustic coupling
A process tomography and acoustic coupling technology, which is applied in the direction of material analysis, analysis of materials, and material magnetic variables by electromagnetic means, and can solve the problems in the field of industrial process tomography that are not applied.
Inactive Publication Date: 2019-03-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
But so far, the above-mentioned multidisciplinary and multiphysics coupling measurement methods have only been applied in the field of medical imaging, but not in the field of industrial process tomography.
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[0050] The present invention will be further described below in conjunction with the drawings and specific embodiments.
[0051] The invention relates to an oil-water two-phase flow process tomography method based on electromagnetic-acoustic coupling. First, a static magnetic field B is constructed in the oil-water two-phase flow pipeline along the fluid flow direction. 0 . This static magnetic field is generated by two coaxial permanent magnetic rings surrounding the pipe. The permanent magnet ring is made of neodymium iron boron material, and each permanent magnet ring is composed of a number of sector-shaped permanent magnets of the same size and shape that are spliced around the same center. The magnetization direction of each small sector magnet is the radial direction of the permanent magnet ring, which is the direction of the radius r. The magnetization direction of one permanent magnet ring points to the center of the circle along the radius r, and the magnetization dir...
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The invention discloses an electromagnetism-sound-coupled process tomography method of an oil-water two-phase flow, and relates to a conductivity tomography method of an oil-water two-phase flow, particularly to a noninvasive tomography method of an oil-water two-phase flow based on electromagnetic pulsed excitation and sound signal detection. Permanent magnet rings externally surrounding a pipeline are used to form a static magnetic field B0 along a flowing direction of the fluid, and two groups of multi-turn loops are used for leading in a transient bipolar electric current. Ultrasonic vibration signals are stimulated in the oil-water two-phase flow and detected through a plurality of ultrasonic probes surrounding the outer wall of the pipeline. Since the conductivity of oil is different from that of water, in virtue of a mathematical physical equation, the ultrasonic signals are used to rebuild a computational formula of an oil-water interface image. Through the method, noninvasive detection and imaging of an oil-water interface in the oil-water two-phase flow are achieved.
Description
Technical field [0001] The invention relates to an oil-water two-phase flow conductivity tomography method, in particular to a non-invasive oil-water two-phase flow tomography method based on electromagnetic pulse excitation and acoustic signal detection. Background technique [0002] Multiphase flow is widely used in petroleum, chemical industry, power, nuclear energy, food and medicine. Especially in the petroleum and chemical industries, the flow characteristics of fluids are often complex, with the characteristics of multiphase mixed flow. According to the composition of the mixture, the multiphase flow is divided into liquid / solid, gas / solid, gas / liquid, liquid / liquid, and gas / liquid / solid. In the petroleum and chemical industries, the fluids in long-distance pipelines are usually liquid-phase fluids separated from liquid, gas and solid phases, mainly including crude oil and formation water, which are liquid / liquid multiphase fluids. Oil-water two-phase flow generally exis...
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IPC IPC(8): G01N27/72G01N27/74
CPCG01N27/725G01N27/74
Inventor 郭亮姜文聪朱赫刘广孚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)