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
5 Cites 22 Cited by

AI-Extracted 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...
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Method used

Adopt fastening nut 4-8 and rubber gasket 4-9 to fix corrugated diaphragm 4-1, have two functions: the one, can play sealing effect to corrugated diaphragm 4-1, in application In the downhole environment, the downhole oil is isolated from the corrugated diaphragm type external pressure sensor 4, so that a pressure difference is generated inside and outside to accurately monitor the pressure outside the casing of the oil and water well; the second is to enable the corrugated diaphragm 4-1 to After being pressed, no peripheral warping occurs, and the rubber gasket 4-9 can relieve the diaphragm damage of the corrugated diaphragm 4-1 due to peripheral stress concentration, so that the corrugated diaphragm 4-1 can withstand repeated elastic extrusion forces.
Corrugated membrane type pipe external pressure sensor 4 is installed respectively in the position that needs to monitor pressure outside oil-water well casing pipe as required, obtains the...
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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.

Application Domain

Fluid pressure measurement using elastically-deformable gaugesFluid pressure measurement by optical means

Technology Topic

Image

  • 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(10)

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,
[0021] A contact hole is opened at the center of one side wall of the base 4-6, and the other outer side wall of the base 4-6 opposite to the side wall is a fixed surface, and a pressure contact 4-6 is arranged in the contact hole. 2. The two ends of the pressure contact 4-2 that are axially parallel to the optical fiber 4-5 have a contact respectively, the two contacts are in contact with the FRP smart rib 4-3, and the two contacts are longitudinally straddled. At both ends of the fiber Bragg grating 4-4, a corrugated diaphragm 4-1 is arranged at the port of the contact hole, and the inner corrugated surface of the corrugated diaphragm 4-1 and the outer wall surface of the pressure contact 4-2 are arranged. The gaps are equal.
[0022] The outer wall surface of the pressure contact 4-2 is profiled according to the shape of the corrugated diaphragm 4-1, so that the outer wall surface of the pressure contact 4-2 has a corrugated shape that matches the surface of the corrugated diaphragm 4-1. It can withstand the pressure of the corrugated diaphragm 4-1, and at the same time has the function of protecting the corrugated diaphragm 4-1, preventing the corrugated diaphragm 4-1 from being deformed irreversibly due to excessive pressure.
[0023] The pressure contact 4-2 is in contact with the FRP smart bar 4-3 at two points, which can ensure that the pressure outside the casing of the oil and water well is effectively converted into the fiber Bragg encapsulated in the FRP smart bar 4-3 when applied in the downhole environment. Axial strain of grating 4-4. The two contact points of the pressure contact 4-2 are in contact with the FRP smart rib 4-3, which can ensure that the fiber Bragg grating 4-4 ​​corresponding to the middle part of the pressure contact 4-2 is not subject to any direction except the axial force Therefore, the external pressure can be completely converted into the axial strain of the fiber Bragg grating 4-4.

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 sensor 4, so that the pressure difference between the inside and outside can be generated to accurately monitor the pressure outside the oil-water well casing; the second is to make the corrugated diaphragm 4-1 pressurized Without the phenomenon of peripheral warpage, the rubber gasket 4-9 can relieve the diaphragm damage of the corrugated diaphragm 4-1 due to the concentration of peripheral stress, so that the corrugated diaphragm 4-1 can withstand repeated elastic pressing force.

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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PUM

PropertyMeasurementUnit
Linear expansion coefficient0.0000108/°c
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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