Fiber Optic Technology for Reservoir Surveillance

Hydraulic fracturing operations in unconventional reservoirs are typically monitored using geophones located either at the surface or in the adjacent wellbores. A new approach to record hydraulic stimulations uses fiber-optic distributed acoustic sensing (DAS). A fiber-optic cable was installed in a treatment well in the Meramec formation to monitor the hydraulic fracture stimulation of an unconventional reservoir. A variety of physical effects, such as temperature, strain, and microseismicity are measured and correlated with the treatment program during hydraulic fracturing of the well containing the fiber and also an adjacent well. The analysis of this DAS data set demonstrates that current fiber-optic technology provides enough sensitivity to detect a considerable number of microseismic events and that these events can be integrated with temperature and strain measurements for comprehensive hydraulic fracture monitoring.

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Structural Monitoring with Fiber Optic Technology

Applied Mechanics Reviews ◽

10.1115/1.1445327 ◽

2002 ◽

Vol 55 (1) ◽

pp. B10-B11 ◽

Cited By ~ 9

Author(s):

RM Measures, ◽

S Abrate,

Keyword(s):

Fiber Optic ◽

Structural Monitoring ◽

Fiber Optic Technology

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ANALYSIS OF THE ACCURACY OF FIBRE-OPTIC STRAIN GAUGES

Acta Polytechnica ◽

10.14311/ap.2013.53.0872 ◽

2013 ◽

Vol 53 (6) ◽

pp. 872-877

Author(s):

Dita Jiroutová ◽

Miroslav Vokáč

Keyword(s):

Fiber Optic ◽

Strain Gauges ◽

Relative Deformation ◽

Fibre Optic ◽

Reinforced Concrete Structure ◽

Structure Monitoring ◽

Fiber Optic Technology ◽

Long Term Monitoring ◽

Term Monitoring

In recent years, the field of structure monitoring has been making increasing use of systems based on fiber-optic technologies. Fiber-optic technology offers many advantages, including higher quality measurements, greater reliability, easier installation and maintenance, insensitivity to the environment (mainly to the electromagnetic field), corrosion resistance, safety in explosive and flammable environments, the possibility of long-term monitoring and lower cost per lifetime. We have used SOFO fibre-optic strain gauges to perform measurements to check the overall relative deformation of a real reinforced concrete structure. Long-term monitoring of the structure revealed that the measurement readings obtained from these fibre-optic strain gauges differed from each other. Greater attention was therefore paid to the calibration of the fibre-optic strain gauges, and to determining their measurement accuracy. The experimental results show that it is necessary to calibrate SOFO strain gauges before they are used, and to determine their calibration constant.

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