Jin, GeJames-Ravenell, Martis Keyon2025-01-132025-01-132024T 9812https://hdl.handle.net/11124/179218Includes bibliographical references.2024 Spring.Distributed acoustic sensing (DAS) serves as a tool in the oil and gas industry for continuously monitoring wellbore activity over the lifetime of a well. The data used in this thesis was recorded from a permanently installed fiber optic cable in a treatment well during hydraulic fracturing operations. Our observations of harmonics, energy decay and erosion, tube waves, and fiber breakage, we believe can expand DAS applications in wellbore monitoring. The harmonics we hypothesize can be utilized to approximate the length of structures in the near-wellbore region (NWR). The observed energy decay likely relates to portions of the wellbore eroding. By identifying the energy decay and its correlation to erosion, we anticipate understanding how energy decay impacts fluid flow allocation, while characterizing erosion provides further insight into wellbore and NWR variations. Additionally, we observed that tube waves act as a metric for stage isolation during perforation shots and hydraulic fracturing activities. Finally, we utilized the fiber breakage event that occurred during hydraulic fracturing to propose a methodology to identify the signs of a fiber breakage event before the fiber break occurs. This thesis proposes that further investigation into these observations can provide benefits for the use of DAS in wellbore monitoring and can assist in justifying the cost of fiber optic installation.born digitalmasters thesesengCopyright of the original work is retained by the author.distributed acoustic sensingdistributed fiber optic sensingunconventional wellText2025-01-10