Here we outline some new technologies in this context within case studies from different research projects including permanent installation of fiber-optic sensor cables behind casing, monitoring of high-temperature wells, a hybrid wireline logging system, and seismic. Here we outline some new technologies in this context within case studies from different research projects including permanent installation of fiber-optic sensor cables behind casing, monitoring of high-temperature wells, a hybrid wireline logging system, and seismic. These results demonstrate that fiber optics represents a paradigm shift in well integrity assessment, transitioning from interpretive and reactive methodologies to real-time, high-resolution, and proactive diagnostics. Fiber optics, a technology that uses thin strands of glass or plastic fibers to. Maintaining well integrity is a critical aspect of safe, efficient, and economically viable oil and gas production. Traditional well diagnostic tools such as calipers and single-point acoustic and temperature logging have been used extensively to assess well conditions. The technology addressed in this course originated for oil and gas operations but are applicable for subsurface CCUS, geothermal. Permanent downhole fiber-optic cables are critical infrastructure in wellbore monitoring systems, ensuring reliable transmission of data for applications such as distributed temperature, acoustic, and strain sensing (DTS, DAS, and DSS)—all with one 1/4-in control line. These monitoring systems help. Carina 100Xlog is a high-efficiency retrievable fibre optic well logging service that visualizes entire well dynamics in real-time much more rapidly than conventional technologies, reducing deferred production. Unlike traditional intervention surveillance technologies, our well logging service.