Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method

The technology of corrugated diaphragm and monitoring device is applied in the direction of fluid pressure measurement of elastic deformation gauge and fluid pressure measurement of optical method, which can solve the problems of real-time online monitoring, etc., and achieves simple structure, high sensitivity coefficient, and easy The effect of manufacture

Inactive Publication Date: 2011-07-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the pressure monitoring of the existing oil-water well casing can only be carried out at a single point in the pip

Method used

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  • Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method
  • Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method
  • Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method

Examples

Experimental program
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Effect test

Example Embodiment

[0019] Specific embodiment one: the following combination figure 2 Illustrating this embodiment, the corrugated diaphragm type external tube pressure sensor described in this embodiment is characterized in that: the corrugated diaphragm type external tube pressure sensor 4 includes a corrugated diaphragm 4-1 and a pressure contact 4-2 , FRP smart bar 4-3, fiber Bragg grating 4-4, optical fiber 4-5, base 4-6 and expansion bolt 4-7,

[0020] The optical fiber 4-5 and the fiber Bragg grating 4-4 ​​are arranged in the central cavity of the base 4-6, the fiber Bragg grating 4-4 ​​is located at the center of the central cavity, and the two ends of the fiber Bragg grating 4-4 ​​are respectively arranged Fiber 4-5, fiber 4-5 and fiber Bragg grating 4-4 ​​are encapsulated on the outer surface of FRP smart bars 4-3, FRP smart bars 4-3 are fixed in the base 4-6 at both ends, and the base The two ends of 4-6 are respectively clamped by the expansion bolts 4-7 to clamp the smart rib 4-3,...

Example Embodiment

[0024] Specific embodiment two: the following combination figure 2 Describing this embodiment, the difference between this embodiment and Embodiment 1 is that the corrugated diaphragm external pressure sensor 4 further includes a fastening nut 4-8 and a rubber gasket 4-9. The corrugated diaphragm 4-1 is fixed at the port of the contact hole through a tightening nut 4-8, and a rubber gasket 4-9 is arranged between the corrugated diaphragm 4-1 and the tightening nut 4-8. Other components and connection relationships are the same as those in the first embodiment.

[0025] The rubber gaskets 4-9 described in this embodiment are standard parts.

[0026] The corrugated diaphragm 4-1 is fixed by the tightening nut 4-8 and the rubber gasket 4-9, which has two functions: one is to seal the corrugated diaphragm 4-1, and it can be used in the underground environment. At the same time, the downhole oil is isolated from the inside of the corrugated diaphragm tube external pressure senso...

Example Embodiment

[0027] Specific embodiment three: the following combination figure 2 Illustrating this embodiment, this embodiment is a further description of the first or second embodiment. A groove is provided in the central cavity of the base 4-6, the groove is opposite to the contact hole, and the groove is arranged opposite to the contact hole. The axial length of the groove along the optical fiber 4-5 is greater than the axial length of the contact hole along the optical fiber 4-5. Other compositions and connection relationships are the same as those in the first or second embodiment.

[0028] The structural features described in this embodiment enable the bases 4-6 to have strong durability, good reliability and stable performance, and can ensure detection accuracy.

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Abstract

The invention discloses a corrugated diaphragm type pipe external pressure sensor, an oil-water well casing external pressure monitoring device and an oil-water well casing external pressure monitoring method, which belong to the technical field of fiber optical sensing and aim to solve the problems that the conventional pressure monitoring of an oil-water well casing only can be performed at a single point in the casing and that real-time online monitoring cannot be performed. An optical fiber and a fiber Bragg grating are arranged in a central cavity of a corrugated diaphragm type pipe external pressure sensor substrate, and are packaged with fiber reinforced plastic intellectual ribs. The two ends of the substrate fixedly clamp the intellectual ribs by expansion bolts respectively. A contact terminal hole is reserved in the center of the sidewall of the substrate. A pressure contact terminal is arranged in the contact hole. Two contacts of the pressure contact terminal are connected to the FRP intellectual ribs in a contacting way, and longitudinally stridden at the two ends of the fiber Bragg grating. A gap between the internal corrugated surface of a corrugated diaphragm at an orifice of the contact terminal hole and the surface of the outer wall of the pressure contact terminal is equal. The corrugated diaphragm type pipe external pressure sensor is adopted in both the oil-water well casing external pressure monitoring device and the oil-water well casing external pressure monitoring method. The corrugated diaphragm type pipe external pressure sensor, the oil-water well casing external pressure monitoring device and the oil-water well casing external pressure monitoring method are used for pressure monitoring.

Description

technical field [0001] The invention relates to a corrugated diaphragm type external pressure sensor, an oil-water well casing external pressure monitoring device and a method, and belongs to the technical field of optical fiber sensing. Background technique [0002] Oil and water well casing damage will not only bring economic losses to the oil field, but also adversely affect the application of oil field development plans and enhanced recovery measures, thus directly affecting oil extraction and oil field development. At present, oil The problem of water well casing damage has become an urgent problem to be solved in my country's oilfields. In order to prevent and slow down the damage of oil and water well casing in advance, it is of great significance to monitor the pressure outside the casing. [0003] At present, most of the downhole pressure tests of oil and water wells adopt mechanical and electronic storage test methods. This method needs to suspend the relevant detec...

Claims

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Application Information

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IPC IPC(8): G01L11/02G01L7/06
Inventor 张广玉董慧娟何俊潘洪亮程国娟刑洋
Owner HARBIN INST OF TECH
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