scholarly journals Long-Term Monitoring with Fiber Optics Distributed Temperature Sensing at Campi Flegrei: The Campi Flegrei Deep Drilling Project

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1009
Author(s):  
Renato Somma ◽  
Claudia Troise ◽  
Luigi Zeni ◽  
Aldo Minardo ◽  
Alessandro Fedele ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Large City ◽  
Temperature Sensing ◽  
Campi Flegrei ◽  
Volcanic Area ◽  
Distributed Temperature Sensing ◽  
Deep Drilling ◽  
Deep Well ◽  
Volcanic Monitoring ◽  
Drilling Project

Monitoring volcanic phenomena is a key question, for both volcanological research and for civil protection purposes. This is particularly true in densely populated volcanic areas, like the Campi Flegrei caldera, which includes part of the large city of Naples (Italy). Borehole monitoring of volcanoes is the most promising way to improve classical methods of surface monitoring, although not commonly applied yet. Fiber optics technology is the most practical and suitable way to operate in such high temperature and aggressive environmental conditions. In this paper, we describe a fiber optics Distributed Temperature Sensing (DTS) sensor, which has been designed to continuously measure temperature all along a 500 m. deep well drilled in the west side of Naples (Bagnoli area), lying in the Campi Flegrei volcanic area. It has then been installed as part of the international ‘Campi Flegrei Deep Drilling Project’, and is continuously operating, giving insight on the time variation of temperature along the whole borehole depth. Such continuous monitoring of temperature can in turn indicate volcanic processes linked to magma dynamics and/or to changes in the hydrothermal system. The developed monitoring system, working at bottom temperatures higher than 100 °C, demonstrates the feasibility and effectiveness of using DTS for borehole volcanic monitoring.

Long-Term Monitoring with Fiber Optics Distributed Temperature Sensing at Campi Flegrei: The Campi Flegrei Deep Drilling Project

2020 ◽  
Author(s):  
Renato Somma ◽  
Claudia Troise ◽  
Luigi Zeni ◽  
Alessandro Minardo ◽  
Alessandro Fedele ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Large City ◽  
Temperature Sensing ◽  
Campi Flegrei ◽  
Volcanic Area ◽  
Distributed Temperature Sensing ◽  
Deep Drilling ◽  
Deep Well ◽  
Volcanic Monitoring ◽  
Drilling Project

<p><span>Monitoring volcanic phenomena is a key question, for both volcanological research and for civil protection purposes. This is particularly true in densely populated volcanic areas, like the Campi Flegrei caldera, including part of the large city of Naples (Italy). Borehole monitoring of volcanoes is the most promising way to improve classical methods of surface monitoring, although not commonly applied yet. Fiber Optics technology is the most practical and suitable way to operate in such high temperature and aggressive environmental conditions. In this paper, we describe a fiber optics DTS (Distributed Temperature Sensing) sensor, which has been designed to continuously measure temperature all along a 500 m. deep well drilled in the West side of Naples (Bagnoli area), lying in the Campi Flegrei volcanic area. It has been then installed as part of the international ‘Campi Flegrei Deep Drilling Project’, and is continuously operating, giving insight on the time variation of temperature along the whole borehole depth. Such continuous monitoring of temperature can in turn indicate volcanic processes linked to magma dynamics and/or to changes in the hydrothermal system. The developed monitoring system, working at bottom temperatures higher than 100 °C, demonstrates the feasibility and effectiveness of using DTS for borehole volcanic monitoring.</span></p>

scholarly journals The Campi Flegrei Deep Drilling Project

2007 ◽  
Vol 4 ◽  
pp. 48-50 ◽  
Author(s):  
G. De Natale ◽  
C. Troise ◽  
M. Sacchi
Keyword(s):  
Campi Flegrei ◽  
Deep Drilling ◽  
Drilling Project

No abstract available. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.4.15.2007" target="_blank">10.2204/iodp.sd.4.15.2007</a>

Well Integrity Leak Diagnostic Using Fiber-Optic Distributed Temperature Sensing and Production Logging

2021 ◽  
Author(s):  
Joerg Abeling ◽  
Ulrich Bartels ◽  
Kamaljeet Singh ◽  
Shaktim Dutta ◽  
Gaurav Agrawal ◽  
...  
Keyword(s):  
Fiber Optics ◽  
Production System ◽  
Fiber Optic ◽  
Operation Time ◽  
Temperature Sensing ◽  
The Novel ◽  
Distributed Temperature Sensing ◽  
Operational Approach ◽  
Well Completion ◽  
Well Integrity

Abstract Fiber optics has many applications in the oil and gas industry. In recent years, fiber optics has found usefulness in leak detection. The leaks can be efficiently identified using fiber-optic distributed temperature sensing measurement, thereby mitigating the health, safety, and environmental (HSE) risk associated with well integrity. Further, a production log can be used to gain more insight and finalize a way ahead to resolve well integrity issues. An innovative solution-driven approach was defined, with fiber-optic distributed measurement playing a key role. Multiple leaks were suspected in the well completion, and a fiber-optic cable was run to identify possible areas of the leak path. After the fiber-optic data acquisition, a production log was recorded across selective depths to provide an insight on leak paths. After identifying leak depths, a definitive decision between tubular patching and production system overhaul was decided based on combined outputs of the fiber-optic acquisition and production log. Results are presented for a well where multiple leaks were successfully identified using the novel operational approach. Further, operational time was reduced from 3 days (conventional slickline memory or e-line logging performed during daylight operation) to 1 day (a combination of fiber-optic distributed temperature sensing and production log in a single run). The diagnosis of production system issues was completed in one shut-in and one flowing condition, thereby reducing the risk of HSE exposure with multiple flowing conditions (to simulate the leak while the conventional production logging tool is moved to different depths in the well). Additional insight on leak quantification was confirmed from the production log data, where one leak was noted at the tubing collar while the other leak was noted a few meters above the tubing collar. This observation was substantial in deciding whether to proceed with tubing patch or replace the entire production tubing. The novel operational approach affirms fiber-optic distributed temperature measurement's versatility in solving critical issues of operation time and reducing HSE exposure while delivering decisive information on production system issues. The paper serves as a staging area for other applications of similar nature to unlock even wider horizons for distributed temperature sensing measurement.

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