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A Downhole Optical Fiber Vortex Flowmeter

A technology of vortex flowmeter and optical fiber, which is applied in the field of downhole optical fiber vortex flowmeter and downhole flow measurement, optical fiber vortex flowmeter and flow measurement, and can solve the problems of low measurement accuracy, poor stability, and complex flowmeter structure. Achieve accurate measurement and improve sensitivity

Inactive Publication Date: 2019-03-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of low measurement accuracy and poor stability caused by the influence of the optical fiber being corroded by the fluid and the influence of the measuring element on the flow field and flow in the pipeline in the existing optical fiber flowmeter, as well as the complex structure of the existing flowmeter. Problems that cannot be used in highly corrosive environments, and then propose a downhole optical fiber vortex flowmeter and downhole flow measurement method

Method used

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  • A Downhole Optical Fiber Vortex Flowmeter
  • A Downhole Optical Fiber Vortex Flowmeter
  • A Downhole Optical Fiber Vortex Flowmeter

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specific Embodiment approach 1

[0028] Specific implementation mode 1: Combination figure 1 To explain this embodiment, the downhole fiber optic vortex flowmeter described in this embodiment includes a fiber grating demodulator 13, and this embodiment also includes a housing 1, a central tube 2, an upper joint 4, a lower joint 5, and an armored optical cable 6. The probe 8, the pressure plate 9, the central axis 10, the fiber grating 11 and the vortex generator 12, the upper joint 4, the central tube 2, and the lower joint 5 are sequentially connected from top to bottom, and the shell 1 is sleeved on the outside of the central tube 2. On the wall, the vortex generator 12 is arranged in the central tube 2. A through hole 7 is opened in the middle of the outer side wall of the central tube 2. The probe 8 is installed in the through hole 7 through a pressure plate 9, and the central shaft 10 is inserted into the probe 8. The fiber grating 11 is arranged in the central axis 10, one end of the armored fiber optic...

specific Embodiment approach 2

[0029] Specific implementation manner two: combination figure 1 To explain this embodiment, the downhole optical fiber vortex flowmeter described in this embodiment further includes two first sealing rings 3-1 and two second sealing rings 3-2, and the upper joint 4 is connected to the upper end of the housing 1. Two first sealing rings 3-1 are provided, and two second sealing rings 3-2 are provided at the connection between the lower joint 5 and the lower end of the housing 1. The other components and connection relationships are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific implementation mode three: combination figure 1 To explain this embodiment, the cross section of the vortex generator 12 of the downhole fiber optic vortex flowmeter described in this embodiment is a polygon with three corners removed from an isosceles triangle, and the vortex generator 12 is made of 316L stainless steel.

[0031] In this embodiment, the bottom surface of the triangular column of the vortex generator 12 is the oncoming surface, and the vertical bisector of the oncoming surface is in the same plane as the flat part of the probe. The vortex generator 12 plays the role of generating and separating vortices, and the triangular column structure The vortex signal generated by the vortex generator 12 is strong and stable, and can also reduce other disturbances and noise of the fluid. Other components and connection relationships are the same as those in the first or second embodiment.

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Abstract

The present invention discloses an underground optical fiber vortex-shedding flowmeter and an underground flow measuring method, and aims to solve the problems, of low measuring precision and poor stability, caused by situations that optical fibers are influenced by fluid corrosion and that measuring elements influence a flow field and flow inside a pipeline in a conventional flowmeter, and the problem that the conventional optical fiber flowmeter is complex in structure and cannot be used in high-temperature, high-voltage and high-erosion environments. An upper joint, a central tube and a lower joint are connected from top to bottom in turn, a housing sleeves an outer side wall of the central tube, a vortex shedder is arranged inside the central tube, a through hole is formed in the middle part of the outer side wall of the central tube, a probe is installed inside the through hole through a pressing plate, a central shaft is inserted inside the probe, a fiber bragg grating is arranged inside the central shaft, and one end of an armored cable is connected with the fiber bragg grating while the other end of the armored cable is connected with a fiber bragg grating demodulation instrument. The underground optical fiber vortex-shedding flowmeter is applied to the oil field equipment field.

Description

Technical field [0001] The invention relates to an optical fiber vortex flowmeter and a flow measurement method, in particular to a downhole optical fiber vortex flowmeter and a downhole flow measurement method, and belongs to the field of oilfield equipment. Background technique [0002] Flow rate is an extremely important parameter in the process of oil production. In daily oil production work, the accuracy and reliability of flow measurement are related to the output of the oilfield, and it is of great significance for the improvement of the development effect of oil and water wells in the oilfield. In the process of oil exploitation, the real-time measurement of crude oil flow rate is particularly difficult due to the special environmental conditions downhole and the special flow state of crude oil. In addition, the measurement of downhole flow involves liquids, gases and multiphase fluids, and the measurement of polymer flow also takes into account the viscous effects of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32
CPCG01F1/32
Inventor 张洪涛张广玉王振龙宋文平李隆球刘丽丽
Owner HARBIN INST OF TECH
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