Bin Yang, Qingchao Zhao, Chuanrui Che, Baixin An, Faxiang Zhang, Wei Sun, Xin Wang, Shaodong Jiang, Ziwen Xu. High-Precision Optical Fiber Temperature and Pressure Sensor and Its Application in Production Wells[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1706006
- Laser & Optoelectronics Progress
- Vol. 59, Issue 17, 1706006 (2022)
Fig. 1. Structure of pressure and temperature sensors. (a) Schematic diagram; (b) physical map
Fig. 2. Relationship between FBG wavelength and temperature
Fig. 3. Pressure calibration results of the sensor
Fig. 4. Relationship between pressure sensitivity and temperature
Fig. 5. Relationship between EFPI cavity length and temperature under normal pressure
Fig. 6. Principle of the downhole monitoring system
Fig. 7. Principle of monitoring instrument and spectrum of sensor
Fig. 8. Test results of cavity length resolution
Fig. 9. Long-term online test results in downhole
Fig. 10. Test results of shut-in operation
Fig. 11. Short-term pressure monitoring results with high resolution
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Table 1. Pressure data measured by sensor
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