How does fibrisTerre’s fiber optic distributed sensing help you manage risk in pipeline and borehole projects?
Pipelines often pass through remote, geologically unstable terrain.
Helicopter fly-overs and right of way inspections may detect leaks and visible threats to the pipeline.
But the earth moves, the climate changes, the weight of the soil above the pipeline varies – what impact do these have on the pipeline, and how do you detect them, remotely and continuously?
Including distributed fiber optic sensing either when the pipeline is installed, or as a retrofit using microtrenching means that small changes in strain due to ground movement or settlement can be detected, located and reported. Small temperature events are located, which may indicate a leak.
A distributed fiber optic sensing system (also known as FOS or DFOS) consists of an inert, robust fiber optic sensing cable (flexible, easy to deploy, maintenance free) and an interrogator measuring more than 50 km of sensing cable.
It monitors continuously, in real time.
Buried on the pipeline right of way they provide continuous, real time and cost-effective geotechnical monitoring over many kilometers, alerting you to potential threats to the pipeline.
Threats detected by fiber optic strain monitoring include:
These may cause the pipeline to deflect, become unsupported or even rupture, putting people, our environment and reputations at risk.
When distributed fiber optic sensing detects a strain event on the pipeline right of way the operator knows the location and can immediately investigate and mitigate the event.
A small temperature event may be a leak or change in the state of the pipeline. Distributed fiber optic sensing indicates the location to within a few meters, so you know where to investigate.
Distributed fiber optic sensing can be attached to the pipe itself to monitor deformation, such as bending and buckling. Useful in areas of faults and extreme weather. Sensors attached to the surface of the pipe provide information on three-dimensional deformation of the object, especially in critical sections.
Borehole strain and temperature monitoring
Monitoring the strain and temperature of a borehole detects casing elongation and shortening, creep and other deformation early on- you can respond before damage escalates.
Strain events and temperature are detected all along the borehole, thanks to continuous detection and location of small events, without interrupting operations.
You can detect fluid ingress from measured temperature data.Monitoring:
Sewers, wastewater tunnels and pipes can be instrumented with fiber optic sensors to monitor water ingress and levels, and deformation. Ideally suited to long linear assets, the robust, inert, cost effective sensor monitors continuously in real time, providing data for condition monitoring as well as detecting unforeseen events.
Embedded fiber optics provide remote sensing and monitoring of structural integrity so critical when other construction works are underway in the vicinity, or in areas of seismic activity.
A fiber-optic based tunnel integrity monitoring system relies on sensing cables as a medium to obtain data for the structural assessment of the tunnels and typically guarantees uninterrupted operation for many decades.