Packaging structure and method of quasi-distributed fiber grating temperature sensor
A temperature sensor and fiber grating technology, which is applied in the field of packaging structure of quasi-distributed fiber grating temperature sensor, can solve the problems of fiber grating temperature sensor damage and easy breaking, and achieves the effects of low cost, good repeatability and small size
Inactive Publication Date: 2012-07-04
沧海田(北京)能源技术开发有限公司
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[0004] However, due to the fragility of the fiber grating itself, it is easy to break. In practical applications, the fiber grating temperature sensor without any protection is easily damaged by the extrusion and shear force of the external force; the fiber grating also has a certain temperature-strain cross-sensitivity. When performing accurate temperature measurement, the change of grating Bragg wavelength caused by external stress or optical fiber stretching must be shielded; in addition, in oil production wells, fiber grating temperature sensors must work in harsh environments such as high temperature, high pressure, acid, alkali, water vapor, etc. middle
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[0025] The best embodiment of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.
[0026] Single Fiber Bragg Grating Temperature Sensor Package (see figure 1 ) is as follows: (1) cutting a section of quartz glass capillary 2 that is 50-100mm in length, 130-150um in inner diameter, and 100-300um in wall thickness; (3) Remove the coating layer of the short pigtail section, and wipe it clean with pure water / alcohol; (5) Thread the quartz capillary 2 onto the long pigtail side 1 of the grating with the coating layer (6) cut the optical fiber at the short tail fiber side 4 with an optical fiber cutter, then put it on the fiber fusion splicer; (7) remove the long tail fiber side 6 of the next grating, cut the flat end face, and ( 6) The end face processed in the process is welded with an optical fiber fusion splicer to form a solder joint 5; (8) Return the quartz capillary 2 to the short tail fiber side 4 of th...
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Abstract
The invention discloses a packaging structure and a packaging method of a quasi-distributed fiber grating temperature sensor. The packaging structure comprises a quartz glass capillary packaging structure for a single fiber grating temperature sensor and a packaging structure of the quasi-distributed fiber grating temperature sensor by adopting triple metal cladding technology. The quartz glass capillary packaging structure for the single fiber grating temperature sensor has the advantages of temperature sensitivity and measuring range meeting the requirements of measurement of high-temperature oil wells, high repeatability, high temperature resistance, small volume, high measuring accuracy and the like. The method for packaging the triple metal cladding packaging structure for the quasi-distributed fiber grating temperature sensor formed by serially connecting a plurality of fiber gratings comprises primary stainless steel tube cladding, secondary aluminum alloy pipe cladding and tripe thick wall stainless steel tube cladding. The packaging structure has the advantages of simpleness, insensitivity to stress and ambient pressure change, and capability of meeting special requirements on fiber grating temperature sensor packaging in a severe environment, particularly high temperature (300 DEG C), high pressure (100MPa), acid, alkali and the like under oil and gas wells.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a packaging technology of a quasi-distributed optical fiber grating temperature sensor, in particular to a packaging structure and method of a quasi-distributed optical fiber grating temperature sensor suitable for temperature measurement in oil and gas wells. Background technique [0002] In the oil reservoir industry, real-time, dynamic, online, and distributed monitoring of the temperature of oil production wells and understanding of the physical state of downhole oil layers are one of the important measures to optimize oil recovery technical solutions and improve oil and gas production and recovery. In the production process of some oil fields, in order to increase oil production, it is necessary to inject high-temperature steam into the oil well or heat it with fire, and the downhole temperature is as high as 300°C or more. Due to the poor reliability, weak anti-...
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IPC IPC(8): G01K11/32G02B6/36G02B6/255G01K11/3206
Inventor 于清旭周新磊
Owner 沧海田(北京)能源技术开发有限公司
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