Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same

A technology of optical time domain reflection and distributed optical fiber, which is applied in the direction of physical/chemical change thermometers, thermometers, measuring devices, etc., and can solve problems such as poor stability, complex structure, and poor corrosion resistance

Inactive Publication Date: 2013-05-08
HARBIN INST OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor corrosion resistance, low sensitivity, complex structure and poor stability of existing downhole temperature monitoring sensors, a distributed optical fiber sensing system based on Brillouin scattered light time domain reflection and downhole temperature monitoring using this system are provided method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same
  • Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same
  • Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 Describe this embodiment, a distributed optical fiber sensing system based on Brillouin scattered light time domain reflection, which includes a laser 10, a coupler 11, a detector 12 and an optical fiber sensor 14, and the laser 10 outputs a beam to the coupler 11 Signal input end, the input / output end of described coupler 11 is connected with one end of optical fiber sensor 14, the optical signal output end of described coupler 11 is connected with the signal input end of detector 12, and the other end of optical fiber sensor 14 is arranged on The outer surface of the oil pipe H is laid in close contact with the oil pipe H.

specific Embodiment approach 2

[0023] Specific implementation mode two: combination figure 1 and figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is the optical fiber sensor 14, which includes an oil-filled bundle tube 1, an optical fiber 2, and a PE sheath 4. The center of the PE sheath 4 is provided with an oil-filled The bundle tube 1 is provided with an optical fiber 2 at the center of the oil-filled bundle tube 1 , and the optical fiber 2 is arranged along the length direction of the oil-filled bundle tube 1 .

[0024] Oil-filled bundle tube 1 is the plastic tube that the inside is filled with fat-like ointment.

specific Embodiment approach 3

[0025] Specific implementation mode three: combination figure 1 and figure 2 This embodiment is described. The difference between this embodiment and the first or second embodiment is that the optical fiber sensor 14 also includes an FRP reinforcement 5 embedded in the PE sheath 4 and arranged symmetrically. On both sides of the oil-filled bundle tube 1.

[0026] Reinforcements made of fiber reinforced resin (FRP) are arranged on both sides of the oil-filled bundle tube 1 . The oil-filled bundle tube 1 and the FRP reinforcement are encapsulated together with a PE sheath 4 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and a subsurface temperature monitoring method using the same, which relates to a temperature sensing system and a temperature monitoring method. The invention solves the problems of poor corrosion resistance, low sensitivity, complex structure and poor stability of the existing subsurface temperature monitoring sensor. A temperature sensor comprises an oil charging beam tube, an optical fiber and a PE sheath, wherein the oil charging beam tube is arranged at the center of the PE sheath, the optical fiber is arranged at the center of the oil charging beam tube, and the optical fiber is arranged along the direction of the oil charging beam tube. The temperature monitoring method comprises the following steps: (1) extending the temperature sensor downwards to the bottom end of an oil tube H, and measuring Brillouin frequency shift VB2 (epsilon 2, T2) at the moment; (2) moving the temperature sensor upwards for N meters, and measuring Brillouin frequency shift VB1 (epsilon 1, T1) at the moment; and (3) subtracting the Brillouin frequency shift measured in the step (1) from the Brillouin frequency shift measured in the step (2), and computing temperature change in different depths. The invention realizes real-time on-line monitoring of subsurface working condition temperature.

Description

technical field [0001] The invention relates to the technical field of laser monitoring, in particular to a temperature sensing system and a temperature monitoring method. Background technique [0002] Wax removal is an important problem in oil field production. The reason is that the temperature under the formation is low. When the temperature is lower than the crystallization temperature of the wax, the wax will adhere to the pipe wall in solid form or be mixed in the oil, resulting in blockage of the pipe. , greatly reducing the efficiency of oil recovery. In order to solve this problem, for many years, pumping wells in Daqing Oilfield have mainly adopted wax removal methods such as thermal washing and wax removal, supplemented by sonic viscosity reduction devices, wax scraping rods, and solid wax preventers. At present, there are many problems in the oil field: low efficiency of thermal cleaning of oil wells, unknown advantages and disadvantages of thermal cleaning meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/07G01K11/32G01K11/322
Inventor 张广玉董惠娟何俊林发枝杨衎朱丙奇
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com