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. 2015 Nov 24;15(11):29648-60.
doi: 10.3390/s151129648.

Study and Test of a New Bundle-Structure Riser Stress Monitoring Sensor Based on FBG

Jian Xu  1   2 , Dexing Yang  3   4 , Chuan Qin  5   6 , Yajun Jiang  7   8 , Leixiang Sheng  9 , Xiangyun Jia  10   11 , Yang Bai  12   13 , Xiaohong Shen  14 , Haiyan Wang  15 , Xin Deng  16 , Liangbin Xu  17 , Shiquan Jiang  18
Affiliations

Study and Test of a New Bundle-Structure Riser Stress Monitoring Sensor Based on FBG

Jian Xu et al. Sensors (Basel). .

Abstract

To meet the requirements of riser safety monitoring in offshore oil fields, a new Fiber Bragg Grating (FBG)-based bundle-structure riser stress monitoring sensor has been developed. In cooperation with many departments, a 49-day marine test in water depths of 1365 m and 1252 m was completed on the "HYSY-981" ocean oil drilling platform. No welding and pasting were used when the sensor was installed on risers. Therefore, the installation is convenient, reliable and harmless to risers. The continuous, reasonable, time-consistent data obtained indicates that the sensor worked normally under water. In all detailed working conditions, the test results show that the sensor can do well in reflecting stresses and bending moments both in and in magnitude. The measured maximum stress is 132.7 MPa, which is below the allowable stress. In drilling and testing conditions, the average riser stress was 86.6 MPa, which is within the range of the China National Offshore Oil Corporation (CNOOC) mechanical simulation results.

Keywords: FBG; bundle-structure; marine test; riser; stress monitoring.

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Figures

Figure 1
Figure 1
The developed bundle-structure riser stress sensor system. (a) A string of five FBG sensors: elastic elements (a1), an optical fiber connector (a2), a FBG environment-compensating sensor (a3), four FBG strain sensors (a4); (b) two unassembled ring-shaped ties; (c) the assembly of five FBG sensors and two ring-shaped ties; (d) housing (d1) and demodulation module (d2).
Figure 2
Figure 2
Schematic diagram of the sensing principle. (a) Riser in tension; (b) Riser under bending; (c) Locations of FBG sensors.
Figure 3
Figure 3
The sensor system assembled on a riser. (a) Assembled connected sensors and ties; (b) assembled housing; (c) close-up of the sensor system lowered into water; (d) working conditions schematic of the ocean oil drilling platform “HYSY981”.
Figure 4
Figure 4
Marine test data of the riser stress monitoring sensor system. (a) Measured wavelengths of five FBG sensors; (b) compensated data of four FBG strain sensors.
Figure 5
Figure 5
(a) Stress results; (b) bending moment results.
Figure 6
Figure 6
CNOOC mechanical simulation stress results.
See this image and copyright information in PMC

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