Distributed fiber optic strain sensing of bending deformation of a well mockup in the laboratory

Well integrity is critical to the safety and success of subsurface energy exploration management, as leakage fluids from reservoirs often induced by compromised wells. This study investigates bending deformation a mockup an oil/gas well that subjected loads expected in deviated wells under reservoir compaction assesses feasibility utilizing distributed fiber optic strain sensing monitor deformation. A mockup, which consists outer inner steel pipes with cemented annulus, tested three-point loading its curvature development monitored Brillouin optical time domain reflectometry/analysis (BOTDR/A) frequency reflectometry (OFDR). The primary objective this research assess performance newly fabricated cables identify key cable characteristics could improve quality measurements BOTDR/A. Results show tight-buffered best suited for maximum errors measurement were ?36% ?24% against conventional sensors at elastic plastic loads, respectively, whereas those non-tight-buffered ?45% ?71%, respectively. Similar trends obtained measurement. detailed design presented elucidate such cable, will facilitate accurate oil gas