CN209818053U - Optical fiber temperature measurement sensor packaging structure used in oil field underground - Google Patents
Optical fiber temperature measurement sensor packaging structure used in oil field underground Download PDFInfo
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- CN209818053U CN209818053U CN201920322142.8U CN201920322142U CN209818053U CN 209818053 U CN209818053 U CN 209818053U CN 201920322142 U CN201920322142 U CN 201920322142U CN 209818053 U CN209818053 U CN 209818053U
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Abstract
The utility model belongs to the oil field logging equipment field especially relates to an optic fibre temperature sensor packaging structure for oil field is in pit, including optic fibre A end, optic fibre B end, fiber grating and shell, the structure of shell includes casing and lower casing, and the two is sealed through threaded connection and through O type sealing washer, and O type sealing washer is installed in the sealing washer inslot in the casing outside down, and the width in sealing washer groove is not less than two times of O type sealing washer cross section diameter, and O type sealing washer is installed in the one side that leans on down in the sealing washer inslot, and uncured thermosetting epoxy is filled to the remaining space in the sealing washer inslot, optic fibre A end and optic fibre B end pass the through-hole entering of two line ball bolt central authorities respectively in the shell. The utility model discloses an adopt unique seal structure, make the shell has high bearing capacity and high temperature resistance's ability, can effectively improve optical fiber sensor's life.
Description
Technical Field
The utility model belongs to oil field logging equipment field especially relates to an optic fibre temperature sensor packaging structure for oil field is in pit.
Background
In oil extraction engineering, monitoring the downhole temperature of an oil well is a common logging mode, and the physical state of an underground oil layer is known through temperature measurement, so that the aims of optimizing an oil extraction technical scheme and improving the oil gas yield and the recovery ratio are fulfilled, and the temperature sensor cannot be used for temperature measurement. At present, most of downhole temperature sensors widely used in various large oil fields are electronic sensors, and the sensors are poor in reliability, weak in anti-interference capacity and short in service life in a high-temperature and high-pressure environment and are difficult to fully meet actual use requirements.
The Fiber Bragg Grating (FBG) sensing technology is a novel sensing technology which is proved in the industry in recent years, has high precision, high reliability, interference resistance and is suitable for severe working environment, and the FBG-based optical fiber sensor has the characteristic of large-scale multiplexing, namely, a plurality of sensors can be connected at the higher level of one signal transmission optical fiber to realize multi-sensor or multi-parameter measurement. A plurality of FBG temperature sensors are cascaded and used for multipoint temperature measurement of an important section in an oil well, and compared with an electronic temperature measurement method, the FBG temperature sensor has the advantages of high temperature resistance, multiple measured temperature points, high reliability, strong anti-interference capability, long service life and the like. The optical fiber sensor is fragile, and a sensor packaging structure is required to be adopted for packaging when the optical fiber sensor is used, but the existing packaging structure is difficult to use in a downhole high-temperature and high-pressure environment and has lower use reliability.
Disclosure of Invention
The utility model provides an optic fibre temperature sensor packaging structure for oil field is in pit to solve the problem that proposes among the above-mentioned background art.
The utility model provides a technical problem adopt following technical scheme to realize: the utility model provides an optical fiber temperature measurement sensor packaging structure used in oil field underground, which comprises an optical fiber A end, an optical fiber B end, an optical fiber grating and a shell, wherein the optical fiber A end, the optical fiber B end and the optical fiber grating are packaged in the shell, the optical fiber A end and the optical fiber B end are respectively connected with the upper end and the lower end of the optical fiber grating, the shell structurally comprises an upper shell and a lower shell which are connected by screw thread and sealed by an O-shaped sealing ring, the O-shaped sealing ring is arranged in a sealing ring groove at the outer side of the lower shell, the width of the sealing ring groove is not less than two times of the diameter of the cross section of the O-shaped sealing ring, the O-shaped sealing ring is arranged at one side which is lower in the sealing ring groove, the residual space in the sealing ring groove is filled with uncured thermosetting epoxy resin, the upper end of the upper shell and the lower end of the lower shell are both provided with line pressing bolts used for fixing optical fibers, all be provided with sealed chamber between line ball bolt and last casing and the lower casing, be provided with the sealed pad that is made by the special-shaped seal cover that rubber made and is made by polytetrafluoroethylene in the sealed chamber, wherein, sealed pad setting is between special-shaped seal cover and line ball bolt, and the one end of casing or lower casing contact on the special-shaped seal cover is conical surface structure, is provided with the ring channel on the inner wall of special-shaped seal cover, also packs in the ring channel and has uncured thermosetting epoxy.
The outer side of the fiber grating is sleeved with a thin-wall stainless steel pipe, and the fiber grating is fixedly packaged in the thin-wall stainless steel pipe through cured thermosetting epoxy resin. The thickness of the thin-wall stainless steel pipe is not more than 0.3 mm.
The utility model has the advantages that:
1. the utility model discloses an adopt unique seal structure, make the shell has high bearing capacity and high temperature resistance's ability, can effectively improve optical fiber sensor's life.
2. The utility model discloses a nonrust steel pipe of thin wall and shell carry out twice encapsulation to fiber grating, and the nonrust steel pipe of thin wall not only is favorable to improving fiber sensor's measurement accuracy, can fully guarantee fiber grating's safety in the shell installation moreover.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-optical fiber A end, 2-pressing line bolt, 3-upper shell, 4-optical fiber grating, 5-lower shell, 6-optical fiber B end, 7-sealing gasket, 8-special-shaped sealing sleeve, 9-thermosetting epoxy resin, 10-O-shaped sealing ring, 11-thin-wall stainless steel pipe and 12-silicone grease.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the embodiment comprises an optical fiber A end 1, an optical fiber B end 6, an optical fiber grating 4 and a shell, wherein the optical fiber A end 1, the optical fiber B end 6 and the optical fiber grating 4 are packaged in the shell, and the optical fiber A end 1 and the optical fiber B end 6 are respectively connected to the upper end and the lower end of the optical fiber grating 4. The above is a common structure in the prior art, and is not described herein again.
The utility model discloses an innovation point lies in: by adopting a unique sealing structure, the shell has extremely high pressure bearing capacity and high temperature resistance, and the service life of the optical fiber sensor can be effectively prolonged. The concrete structure is as follows:
the structure of shell includes casing 3 and lower casing 5 down, and the two passes through threaded connection and seals through O type sealing washer 10, and O type sealing washer 10 is installed in the sealing washer inslot in casing 5 outside down. The O-shaped sealing ring 10 can effectively ensure the basic sealing performance of the shell.
The width of the seal ring groove is not less than twice the diameter of the cross section of the O-ring 10, the O-ring 10 is installed on the lower side (i.e., the pressure inlet side) in the seal ring groove, and the remaining space in the seal ring groove is filled with the uncured thermosetting epoxy resin 9. After the upper shell 3 and the lower shell 5 are assembled, the joint between the upper shell 3 and the lower shell 5 is pressurized, the O-shaped sealing ring 10 moves to one side of a pressure outlet in the sealing ring groove under the action of pressure and partially extrudes uncured thermosetting epoxy resin 9 into a gap to seal the gap, meanwhile, the rubber material on the O-shaped sealing ring 10 is also partially extruded into the gap (which is the basic sealing principle of all O-shaped sealing rings 10), the uncured thermosetting epoxy resin 9 is cured and shaped by heating while the pressure is kept unchanged, so that efficient sealing is realized, and the heating temperature is usually 150 ℃ and 170 ℃. Meanwhile, the thermosetting epoxy resin 9 isolates air, so that the O-shaped sealing ring 10 can be effectively prevented from being oxidized, and the service life of the O-shaped sealing ring is prolonged.
The upper end of the upper shell 3 and the lower end of the lower shell 5 are both provided with wire pressing bolts 2 for fixing optical fibers, the optical fiber A end 1 and the optical fiber B end 6 respectively penetrate through the through holes in the centers of the two wire pressing bolts 2 to enter the shell, a sealing cavity is formed between the wire pressing bolts 2 and the upper shell 3 and between the wire pressing bolts 2 and the lower shell 5, a special-shaped sealing sleeve 8 made of rubber and a sealing gasket 7 made of polytetrafluoroethylene are arranged in the sealing cavity, the sealing gasket 7 is arranged between the special-shaped sealing sleeve 8 and the wire pressing bolts 2, one end, contacting with the upper shell 3 or the lower shell 5, of the special-shaped sealing sleeve 8 is of a conical surface structure, an annular groove is formed in the inner wall of the special-shaped sealing sleeve 8, and uncured thermosetting. After the pressing line bolt 2 is screwed down, the uncured thermosetting epoxy resin 9 is cured and shaped in a heating mode, so that more reliable sealing is realized, and the heating temperature is usually 150-170 ℃.
Fiber grating 4's outside cover have thin wall stainless steel pipe 11, fiber grating 4 encapsulates in thin wall stainless steel pipe 11 through thermosetting epoxy 9 that has solidified, the utility model discloses a thin wall stainless steel pipe 11 and shell carry out twice encapsulation to fiber grating 4, thin wall stainless steel pipe 11 not only is favorable to improving fiber sensor's measurement accuracy, can fully guarantee fiber grating 4's safety in the shell installation moreover. The thickness of the thin-wall stainless steel pipe 11 is not more than 0.3 mm.
As a further technical scheme, the empty space inside the shell can be filled with the silicone grease 12, and the silicone grease 12 can effectively assist in sealing.
Claims (3)
1. The utility model provides an optic fibre temperature measurement sensor packaging structure for oil field is DH, includes optic fibre A end (1), optic fibre B end (6), fiber grating (4) and shell, and optic fibre A end (1), optic fibre B end (6) and fiber grating (4) encapsulation are in the shell, and the upper and lower both ends at fiber grating (4) are connected respectively to optic fibre A end (1) and optic fibre B end (6), its characterized in that: the structure of the shell comprises an upper shell (3) and a lower shell (5), the upper shell and the lower shell are connected through threads and sealed through an O-shaped sealing ring (10), the O-shaped sealing ring (10) is arranged in a sealing ring groove on the outer side of the lower shell (5), the width of the sealing ring groove is not less than twice the diameter of the cross section of the O-shaped sealing ring (10), the O-shaped sealing ring (10) is arranged on one side, close to the lower side, in the sealing ring groove, uncured thermosetting epoxy resin (9) is filled in the residual space in the sealing ring groove, wire pressing bolts (2) used for fixing optical fibers are arranged at the upper end of the upper shell (3) and the lower end of the lower shell (5), an optical fiber A end (1) and an optical fiber B end (6) respectively penetrate through holes in the centers of the two wire pressing bolts (2) to enter the shell, and sealing cavities are arranged among the wire pressing bolts (2), the upper, the special-shaped sealing sleeve (8) made of rubber and the sealing gasket (7) made of polytetrafluoroethylene are arranged in the sealing cavity, the sealing gasket (7) is arranged between the special-shaped sealing sleeve (8) and the line pressing bolt (2), one end, which is in contact with the upper shell (3) or the lower shell (5), of the special-shaped sealing sleeve (8) is of a conical surface structure, an annular groove is formed in the inner wall of the special-shaped sealing sleeve (8), and uncured thermosetting epoxy resin (9) is filled in the annular groove.
2. The optical fiber temperature measuring sensor packaging structure used in the oil field downhole according to claim 1, wherein: the outer side of the fiber grating (4) is sleeved with a thin-wall stainless steel pipe (11), and the fiber grating (4) is packaged in the thin-wall stainless steel pipe (11) through cured thermosetting epoxy resin (9).
3. The optical fiber temperature measurement sensor packaging structure used in the oil field downhole according to claim 2, wherein: the thickness of the thin-wall stainless steel pipe (11) is not more than 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920322142.8U CN209818053U (en) | 2019-03-13 | 2019-03-13 | Optical fiber temperature measurement sensor packaging structure used in oil field underground |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920322142.8U CN209818053U (en) | 2019-03-13 | 2019-03-13 | Optical fiber temperature measurement sensor packaging structure used in oil field underground |
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| CN209818053U true CN209818053U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112519304A (en) * | 2020-11-12 | 2021-03-19 | 钢研昊普科技有限公司 | Multipoint temperature measurement leading-out device of hot isostatic pressing machine |
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2019
- 2019-03-13 CN CN201920322142.8U patent/CN209818053U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112519304A (en) * | 2020-11-12 | 2021-03-19 | 钢研昊普科技有限公司 | Multipoint temperature measurement leading-out device of hot isostatic pressing machine |
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