FLI is an entirely new method of well intervention for the purpose of data profiling. It uses a bare, disposable fiber optic line for distributed sensing of temperature, pressure and/or acoustic data along its whole length. This distributed profile, gained simultaneously over time and distance, creates a much better understanding of the well compared to single point measurements taken in isolation.
In developing FLI, Well-SENSE are incorporating compact devices into the body of the tool, to deliver real-time streamed data as well as single point measurements, such as pressure sensing, to enhance the overall profile picture of the well. This will turn our ‘Passive FLI’ into ‘Active FLI’.
The FLI tool, containing the fiber optic line on an internal spool, is dropped down the vertical section of the well, unspooling the line without tension as it free falls downhole. The fiber line uses a continuous beam of laser light which is altered at points along its length, depending on environmental interference. For example, if it is measuring acoustic profiles, a sound will be generated at source and changes in soundwave pressure frequency will be measured. Our fiber optic lines can deliver real-time measurements, over their full length over a period of time and data is captured by a recording device at the surface.
FLI is different to other fiber optic measurement devices as it is run into the well as bare line, without being encased within an intervention media. Once it is run and has delivered the necessary data it is disposed of in the well and does not result in an obstruction. This is the only fiber optic sensing method for oil and gas wells that is disposable.
Fiber optic data capture is faster, more reliable and more accurate than other methodology, such as measurements taken using wireline tools and transmitted via copper wire.
We can increase the number of fiber optic lines installed into wells and collect a huge amount of well data, resulting in a much greater understanding of performance and integrity. This will lead to much more efficient and safer recovery of hydrocarbons, whilst lowering cost and risk.
FLI provides huge time, space, transport and cost savings, removing the need for intervention media such as coiled tubing or wireline to deliver the fiber into the well and its associated surface spooling equipment and personnel, complicated rigging up and down and associated non-productive time.
The FLI kit can be delivered to site on the back of a pick up truck, or in a small container offshore, and be ready to run in less than an hour compared to around ten hours to rig up slickline. There is less risk of getting stuck in hole, less risk of lost equipment and no lost in hole charges. There is no NPT associated with rigging down.