Reliability of fiber Bragg grating based sensors for downhole applications

Nellen, Philipp M.; Mauron, Pascal; Frank, Andreas; Sennhauser, U.; Bohnert, K.; Pequignot, P.; Bodor, P.; Brändle, H.

doi:10.1016/s0924-4247(02)00430-2

Cited by 99 publications

(31 citation statements)

References 19 publications

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“…Fiber optic sensors for downhole application have attracted much research interest in both academia and industry [1][2][3][4][5]. Conventional electrical gauges used for in-well parameter measurements have a high failure rate when implemented in a high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

High pressure sensor based on photonic crystal fiber for downhole application

Tse

et al. 2010

Appl. Opt.

113

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We demonstrate a polarization-maintaining (PM) photonic crystal fiber (PCF) based Sagnac interferometer for downhole high pressure sensing application. The PM PCF serves as a direct pressure sensing probe. The sensor is transducer free and thus fundamentally enhances its long-term sensing stability. In addition, the PM PCF can be coiled into a small diameter to fulfill the compact size requirement of downhole application. A theoretical study of its loss and birefringence changes with different coiling diameters has been carried out. This bend-insensitive property of the fiber provides ease for sensor design and benefits practical application. The pressure sensitivities of the proposed sensor are 4.21 and 3:24 nm= MPa at ∼1320 and ∼1550 nm, respectively. High pressure measurement up to 20 MPa was achieved with our experiment. It shows both good linearity in response to applied pressure and good repeatability within the entire measurement range. The proposed pressure sensor exhibits low temperature cross sensitivity and high temperature sustainability. It functions well without any measurable degradation effects on sensitivity or linearity at a temperature as high as 293°C. These characteristics make it a potentially ideal candidate for downhole pressure sensing.

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Section: Introductionmentioning

confidence: 99%

High pressure sensor based on photonic crystal fiber for downhole application

Tse

et al. 2010

Appl. Opt.

113

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“…Since there is a micro-bend fraction in structural design, FOBG T is free from the liquid-gas pressure effect and is only for temperature sensing, FOBG P is for pressure and temperature sensing. The transducing tube is the main element of this sensing head, as the name shown, it is used to transduce the vibration of the pressure △P into axial strain variety of the FOBG P ax ε ∆ , their relations can be expressed as [5,7] …”

Section: Pressure and Temperature Fobg Sensing Modulementioning

confidence: 99%

Pressure and temperature sensing system based on fiber optic Bragg gratings for the oil and gas downhole

Zhang

Wei-ping

et al. 2004

SPIE Proceedings

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A pressure and temperature sensing system based on fiber-optic Bragg grating sensors for the oil and gas downhole is reported in this paper, the weak pressure sensitivity is enhanced and the cross-sensitivity of temperature and pressure measurands is overcome by an optimally designed mechanical enhancing and compensating structure, the working principle, experimental setup and testing results are also given.

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“…Also, sensitive elements of electronic components are needed for data processing in this harsh environment which affects the reliability of the sensor. One major challenge of the electrical sensors is that they become extremely unreliable when used in harsh environments [1].…”

Section: Introductionmentioning

confidence: 99%