用于油井温度剖面快速测量的高精度光纤光栅温度传感器设计

Design of high precision fiber Bragg grating temperature sensor for rapid measurement of oil well temperature profile

为实现对油井温度剖面的高精度快速测量,设计了一种游走式高精度光纤光栅温度传感器,采用超细不锈钢管进行耐压封装,进行了温度响应速度的理论仿真,并分析了井下高压对测量精度的影响。对直径1.2 mm的传感器采用商用高精度解调仪进行解调后进行了测试。结果表明,设计的光纤光栅温度传感器的分辨率为0.01℃,测温线性范围到达175℃,响应速度小于108 ms,耐压可达100 MPa,能够满足油井温度剖面快速测量的需要。

Aiming at the high precision and rapid measurement of the down-hole temperature profile,a new kind of walking high-precision fiber grating temperature sensor was designed in this paper. The ultra-fine stainless steel tube was used for pressure encapsulation. The theoretical simulation of the temperature response speed was carried out,and the impact of the down-hole high pressure on the measurement accuracy was analyzed. The sensor with a diameter of 1. 2 mm was demodulated by commercial high-precision demodulator. The results show that the resolution of the FBG temperature sensor is better than 0.01 oC,the linear range of the temperature reaches 175 oC,the response time is less than 108 ms,and the resistance to pressure is up to 100 MPa. This sensor can meet the needs of rapid measurement of the oil well temperature profile.