Extended-length fiber optic carbon dioxide monitoring

Delgado-Alonso, Jesus; Lieberman, Robert A.

doi:10.1117/12.2019321

Cited by 5 publications

(3 citation statements)

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“…In addition to the periodic groundwater sampling method for monitoring groundwater chemistry, a fiber-optic CO 2 sensor, newly developed by Intelligent Optical Systems, Inc., was installed in the lower 3 m of the testing well for real-time in situ monitoring of dissolved CO 2 (Figure a). The sensor was configured to measure dissolved CO 2 every 30 s. The fiber-optic sensor includes two main parts: the optic fiber and an optoelectronic subsystem (Figure a).…”

Section: Materials and Methodsmentioning

confidence: 99%

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Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test

Yang

Hovorka

Delgado-Alonso

et al. 2014

Environ. Sci. Technol.

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This study presents two field pulselike CO2-release tests to demonstrate CO2 leakage detection in a shallow aquifer by monitoring groundwater pH, alkalinity, and dissolved inorganic carbon (DIC) using the periodic groundwater sampling method and a fiber-optic CO2 sensor for real-time in situ monitoring of dissolved CO2 in groundwater. Measurements of groundwater pH, alkalinity, DIC, and dissolved CO2 clearly deviated from their background values, showing responses to CO2 leakage. Dissolved CO2 observed in the tests was highly sensitive in comparison to groundwater pH, DIC, and alkalinity. Comparison of the pulselike CO2-release tests to other field tests suggests that pulselike CO2-release tests can provide reliable assessment of geochemical parameters indicative of CO2 leakage. Measurements by the fiber-optic CO2 sensor, showing obvious leakage signals, demonstrated the potential of real-time in situ monitoring of dissolved CO2 for leakage detection at a geologic carbon sequestration (GCS) site. Results of a two-dimensional reactive transport model reproduced the geochemical measurements and confirmed that the decrease in groundwater pH and the increases in DIC and dissolved CO2 observed in the pulselike CO2-release tests were caused by dissolution of CO2 whereas alkalinity was likely affected by carbonate dissolution.

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Section: Materials and Methodsmentioning

confidence: 99%

“…The detection limit of fiber-optic sensors is ∼0.5 mg/L, and the limit of quantification is ∼2 mg/L (dissolved CO 2 ). Detail information about fabrication, operation, and laboratory calibration of a fiber-optic CO 2 sensor can be found in the work of Delgado-Alonso and Lieberman …”

Section: Materials and Methodsmentioning

confidence: 99%

Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test

Yang

Hovorka

Delgado-Alonso

et al. 2014

Environ. Sci. Technol.

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“…For DCS applications, a technique of interest uses a sensitive or reactive outer surface of the optical fiber to detect a particular chemical. This can take the form of the buffer coating on the optical fiber or some type of active cladding 25 . The active clad design has been used in security applications for hazardous material detection.…”

Section: Distributed Sensing -New Developmentsmentioning

confidence: 99%

Brief history of fiber optic sensing in the oil field industry

Baldwin

2014

SPIE Proceedings

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The use of fiber optic sensing in the oil and gas industry has greatly expanded over the past two decades. Since the first optical fiber-based pressure sensor was installed in a well in 1993, the industry has sought to use fiber sensing technology to monitor in-well parameters. Through the years, optical fiber sensing has been used in an increasing number of applications as technical advances have opened the door for new measurements. Today, fiber optic sensors are used routinely to measure temperature throughout the wellbore. Optical sensors also provide pressure measurements at key locations within the well. These measurements are used to verify the integrity of the well, provide feedback during well completion operations, including the actuation of downhole valves, and to monitor the production or injection process. Other sensors, such as seismic monitors and flowmeters, use fiber sensing technology to make in-well measurements. Various optical sensing techniques are used to make these measurements, including Bragg grating, Raman scattering, and coherent Rayleigh scattering. These measurements are made in harsh environments, which require rugged designs for optical cable systems and instrumentation systems. Some of these applications have operating temperatures of 572°F (300°C), and other applications can have pressures in excess of 20,000 psi (1,379 bar). This paper provides a historical perspective on the use of fiber optic sensing in the oil and gas industry from industry firsts to current applications.

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Monitoring dissolved CO2 in groundwater for CO2 leakage detection in a shallow aquifer

et al. 2014

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This study presents demonstration of monitoring dissolved CO 2 using fiber-optic CO 2 sensors for CO 2 leakage detection through a small-scale field test. Theoretical analysis of CO 2 leakage into a potable aquifer system with and without the presence of carbonates in the aquifer sediments suggests that dissolved CO 2 is a good indicator of CO 2 leakage. CO 2 leakage was simulated through two pulse-like CO 2 releases into a single testing well which were monitored with a fiber-optic CO 2 sensor and periodic groundwater sampling. Field results show that the changes in dissolved CO 2 concentrations were detected by the CO 2 sensor, confirming that it is possible to use chemical sensors for real-time in situ leakage detection at a geological carbon sequestration site.

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Extended-length fiber optic carbon dioxide monitoring

Cited by 5 publications

References 0 publications

Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test

Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test

Brief history of fiber optic sensing in the oil field industry

Monitoring dissolved CO2 in groundwater for CO2 leakage detection in a shallow aquifer

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Extended-length fiber optic carbon dioxide monitoring

Cited by 5 publications

References 0 publications

Field Demonstration of CO2 Leakage Detection in Potable Aquifers with a Pulselike CO2-Release Test

Field Demonstration of CO2 Leakage Detection in Potable Aquifers with a Pulselike CO2-Release Test

Brief history of fiber optic sensing in the oil field industry

Monitoring dissolved CO2 in groundwater for CO2 leakage detection in a shallow aquifer

Contact Info

Product

Resources

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Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test

Field Demonstration of CO₂ Leakage Detection in Potable Aquifers with a Pulselike CO₂-Release Test