CN203824688U - Grating pressure transducer for detecting oil well pressure - Google Patents
Grating pressure transducer for detecting oil well pressure Download PDFInfo
- Publication number
- CN203824688U CN203824688U CN201420233865.8U CN201420233865U CN203824688U CN 203824688 U CN203824688 U CN 203824688U CN 201420233865 U CN201420233865 U CN 201420233865U CN 203824688 U CN203824688 U CN 203824688U
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- grating
- pressure
- thin
- wall
- cylinder
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- 239000003129 oil well Substances 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 229910000816 inconels 718 Inorganic materials 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 abstract description 4
- 239000013307 optical fiber Substances 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 206010011409 Cross infection Diseases 0.000 description 2
- 206010029803 Nosocomial infection Diseases 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a grating pressure transducer for detecting oil well pressure, comprising a stain member; the middle portion of the strain member is of a cylinder; the side wall of the cylinder is very thin; the side wall of one end of the cylinder is thick; the thin wall is provided with a pressure measurement grating by pasting; the thick wall is provided with a temperature compensation grating by pasting; the pressure measurement grating is connected to the temperature compensation grating through a common optical fiber; and the pressure measurement grating and the temperature compensation grating are respectively connected to a transmission optical fiber through a common optical fiber. The grating pressure transducer for detecting the oil well pressure adopts a thin-wall cylinder structure capable of amplifying stress, the pressure grating is installed on the peripheral outer wall of the thin wall cylinder and is pasted radially along the outer wall of the thin-wall cylinder, the temperature grating is installed on the thick wall on the bottom of the thin-wall cylinder, so that the temperature grating is not sensitive to the strain, the installation mode causing the cross sensitivity of temperature and pressure in the prior art can be avoided, and temperature compensation during the pressure collection can be performed. Furthermore, the grating pressure transducer for detecting oil well pressure improves the reliability of the sensor structure and the accuracy of the pressure temperature measurement.
Description
Technical field
the utility model relates to a kind of grating pressure sensor for detection of oil well pressure, belongs to oil field well pressure measurement technology field.
Background technology
the pressure of oil well, temperature are to weigh the important parameter of oil well situation, at present, the pressure of oil well, the monitoring of temperature parameter normally adopt electron pressure measuring technology to realize, but in the subsurface environment of high temperature, high pressure, deep-etching, the stability of electronic product long-term work and reliability are extremely limited, even can not use.The advantages such as that fiber grating pressure and temp test has is high temperature resistant, high pressure, burn into can distributed measurements, can permanently place, traditional electrical minor pressure gauge relatively, has improved pressure temperature measuring environmental suitability and range of application greatly.But there is the problem such as sensor test poor stability, temperature, pressure cross-infection in optical fiber pressure temperature test technology at present.These drawbacks limit the popularization on a large scale of fiber grating pressure-temperature sensor.
Summary of the invention
the purpose of this utility model is, a kind of grating pressure sensor for detection of oil well pressure is provided, and to solve the problems such as existing sensor test poor stability, temperature, pressure cross-infection, thereby overcomes the deficiencies in the prior art.
the technical solution of the utility model is achieved in that
a kind of grating pressure sensor for detection of oil well pressure of the present utility model is that this grating pressure sensor comprises strain gauge element; Strain gauge element middle part is cylindric, and the sidewall of cylinder is thin-walled, and one end of cylinder is heavy wall, is pasted with pressure measuring gratings on thin-walled, is pasted with temperature compensation grating on heavy wall; Between pressure measuring gratings and temperature compensation grating, be connected through ordinary optic fibre; Pressure measuring gratings is connected with Transmission Fibers through ordinary optic fibre respectively with temperature compensation grating.
in aforementioned grating pressure sensor, described strain gauge element adopts Inconel 718 materials to make, and the elastic modulus of material is 1.99 × 10
5
mPa～2.01 × 10
5
mPa, Poisson ratio is 0.29～0.30.
in aforementioned grating pressure sensor, on described strain gauge element, the internal diameter of thin cylinder is 10.01～12.48mm, and wall thickness is 1.2～1.5mm.
in aforementioned grating pressure sensor, the side that described strain gauge element posts temperature compensation grating is provided with containment vessel.
in aforementioned grating pressure sensor, described strain gauge element is provided with optic fibre hole, and Transmission Fibers is connected with extraneous through optic fibre hole.
owing to having adopted technique scheme, the utility model compared with prior art, the utility model has structurally adopted the thin-wall tubular structure with Amplification function, pressure grating is arranged on the thin-walled at thin cylinder two ends, temperature grating is arranged on the sidewall of thin cylinder, avoid the mounting means of pressure and temperature cross sensitivity in prior art, in the time carrying out pressure acquisition, can carry out temperature compensation.The reliability of sensor construction and the accuracy of pressure temperature measuring are realized.Therefore can realize the temperature survey of reliable High Temperature High Pressure down-hole pressure.
Brief description of the drawings
fig. 1 is structural representation of the present utility model;
fig. 2 is the structural representation of strain gauge element.
being labeled as in figure: 1-strain gauge element, 2-thin-walled, 3-heavy wall, 4-pressure measuring gratings, 5-temperature compensation grating, 6-ordinary optic fibre, 7-Transmission Fibers, 8-containment vessel, 9-optic fibre hole.
Embodiment
below in conjunction with drawings and Examples, the utility model is described in further detail, but not as to any restriction of the present utility model.
the utility model is constructed according to a kind of following method that detects oil well pressure, as depicted in figs. 1 and 2, the method is that sensor is put into oil well, convert the pressure in oil well on the strain gauge element strain of thin-walled physical dimension on thin cylinder by sensor, then by pressure measuring gratings, the strain of cylinder thin-walled physical dimension on strain gauge element is converted to the variation of grating Prague centre wavelength; The funtcional relationship that Prague centre wavelength and pressure and temperature exist is Δ λ=K
p
× Δ P+K
t
× Δ T, wherein, Δ λ Prague center wavelength variation amount, K
p
for presser sensor coefficient, K
t
for temperature-sensitivity coefficient; By demarcation eliminate temperature-sensitivity coefficient on the impact of Prague centre wavelength after, the variable quantity of current grating Prague centre wavelength is current pressure in corresponding oil well.Pressure conversion is that the pressure measuring gratings by being attached on strain gauge element thin-walled realizes, be subject to the used time of doing of oil well internal pressure at sensor, strain gauge element generation deformation, cause the physical dimension of strain gauge element thin-walled to produce strain, then by pressure measuring gratings, physical dimension strain is converted to the variation of fiber grating Prague centre wavelength.On the thin-walled of strain gauge element, post temperature compensation grating, can in gaging pressure, measure real time temperature by temperature compensation grating, in the time calculating oil well pressure by grating Prague center wavelength variation amount, can introduce temperature compensation coefficient, to obtain more accurate force value.
as depicted in figs. 1 and 2, this grating pressure sensor comprises strain gauge element 1 to the structural representation of the of the present utility model a kind of grating pressure sensor for detection of oil well pressure building according to said method; Strain gauge element 1 middle part is cylindric, and the sidewall of cylinder is thin-walled 2, and one end of cylinder is heavy wall 3, is pasted with pressure measuring gratings 4 on thin-walled 2, is pasted with temperature compensation grating 5 on heavy wall 3; Between pressure measuring gratings 4 and temperature compensation grating 5, be connected through ordinary optic fibre 6; Pressure measuring gratings 4 is connected with Transmission Fibers 7 through ordinary optic fibre 6 respectively with temperature compensation grating 5.Described strain gauge element adopts Inconel 718 materials to make, and the elastic modulus of material is 1.99 × 10
5
mPa～2.01 × 10
5
mPa, Poisson ratio is 0.29～0.30.On strain gauge element 1, the internal diameter of thin cylinder is 10.01～12.48mm, and wall thickness is 1.2～1.5mm.The side that strain gauge element 1 posts temperature compensation grating 5 is provided with containment vessel 8.Strain gauge element 1 is provided with optic fibre hole 9, and Transmission Fibers 7 is connected with extraneous through optic fibre hole 9.
when concrete enforcement, first should be according to high temperature under oil well, the feature of High Voltage corrosion, the material of sensor is made in selection, and the material that this example is selected is Inconel 718.
then according to the parameter such as elastic modulus, Poisson ratio of the pressure limit under oil well (70MPa), superpressure scope (150%) and selected material, the maximum that calculates thin cylinder in sensor construction allows diameter thickness ratio, and the maximum of this example allows diameter thickness than being 8.96:1.And allowing diameter thickness ratio according to the minimum that the pressure precision of sensor requires (0.2%F.S) and the precision (3pm) of the wavelength demodulation device that uses calculates thin cylinder in sensor construction, the maximum of this example allows diameter thickness than being 8.34:1.The actual diameter thickness ratio of choosing will be not less than 8.34, be not more than 8.96, has chosen 8.34 herein as diameter thickness ratio.Then according to the thickness of the thin cylinder in the characteristic choose reasonable sensor constructions such as the surface smoothness of the corrosion resistance characteristic of sensor material, machining, add the factor such as level, qualification rate according to machine, the wall thickness of design is 1.2mm～1.5mm herein; Then allow diameter thickness than allowing diameter thickness than the internal diameter of thin cylinder in calculating sensor with minimum according to maximum.Finally press structure processed sensor shown in Fig. 1 and Fig. 2, in order to protect the safety of pressure grating and temperature grating, be provided with containment vessel outward at sensor.
Claims (5)
1. for detection of a grating pressure sensor for oil well pressure, comprise strain gauge element (1); It is characterized in that: strain gauge element (1) middle part is for cylindric, and the sidewall of cylinder is thin-walled (2), and one end of cylinder is heavy wall (3), is pasted with pressure measuring gratings (4) on thin-walled (2), is pasted with temperature compensation grating (5) on heavy wall (3); Between pressure measuring gratings (4) and temperature compensation grating (5), be connected through ordinary optic fibre (6); Pressure measuring gratings (4) is connected with Transmission Fibers (7) through ordinary optic fibre (6) respectively with temperature compensation grating (5).
2. the grating pressure sensor for detection of oil well pressure according to claim 1, is characterized in that: described strain gauge element (1) adopts Inconel 718 materials to make, and the elastic modulus of material is 1.99 × 10
5mPa～2.01 × 10
5mPa, Poisson ratio is 0.29～0.30.
3. grating pressure sensor according to claim 1, is characterized in that: the internal diameter of the upper thin cylinder of described strain gauge element (1) is 10.01～12.48mm, and wall thickness is 1.2～1.5mm.
4. grating pressure sensor according to claim 3, is characterized in that: the side that described strain gauge element (1) posts temperature compensation grating (5) is provided with containment vessel (8).
5. grating pressure sensor according to claim 4, is characterized in that: on strain gauge element (1), be provided with optic fibre hole (9), Transmission Fibers (7) is connected with the external world through optic fibre hole (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420233865.8U CN203824688U (en) | 2014-05-08 | 2014-05-08 | Grating pressure transducer for detecting oil well pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420233865.8U CN203824688U (en) | 2014-05-08 | 2014-05-08 | Grating pressure transducer for detecting oil well pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203824688U true CN203824688U (en) | 2014-09-10 |
Family
ID=51480173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420233865.8U Expired - Lifetime CN203824688U (en) | 2014-05-08 | 2014-05-08 | Grating pressure transducer for detecting oil well pressure |
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| Country | Link |
|---|---|
| CN (1) | CN203824688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964816A (en) * | 2020-08-19 | 2020-11-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
-
2014
- 2014-05-08 CN CN201420233865.8U patent/CN203824688U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964816A (en) * | 2020-08-19 | 2020-11-20 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
| CN111964816B (en) * | 2020-08-19 | 2022-04-01 | 中国航空工业集团公司沈阳飞机设计研究所 | Grating pressure sensor for detecting pipeline pressure and measuring system with same |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |