Well Monitoring

PRODUCTION OPTIMIZATION

Analyzing the dynamics of the reservoirs to regulate their production and to anticipate their behaviour during the operation.

The production and injection profiles are defined with the FEBUS A1 (DAS - Distributed Acoustic Sensing) and the FEBUS T1-R (DTS - Distributed Temperature Sensing).

Onshore or offshore acquisitions provide:

• real-time information
• distributed data (adaptable number of measuring points and interval)
• understandable directly on-site
• and during all the lifetime of the well operation.

Without interrupting the production, several information are seen among other things:

• the flow intensity of the perforations level allowing to identify the best production or injection zones
• the warm-back effects

Stimulation of a perfored interval by injecting hot water and estimation of the required time to come back to the thermal balance ("warm-back") with the FEBUS T1-R (DTS)

A combination of FEBUS DAS and DTS technologies can be made for a better characterization of a reservoir via an accurate analysis of the data at the perforations level.



WELL INTEGRITY

Any failure on a well can have severe consequences on the environment and on the well productivity.

A complete well integrity monitoring system is created by combining the FEBUS A1 (DAS), the FEBUS T1-R (DTS) and the FEBUS G1-R (DSTS).

• Our solution offers highly sensitive devices, distributed and real-time data.
• Any failure on the tubings/casings or on any part of the completion that could affect the productivity of your operation and have a significant environmental impact is detected.
• Alerts in case of damage on the completion are instantaneously sent.
• A quick and adapted response can be organized.

Among other things, FEBUS Optics solution allows to detect:

• leaks on the completion

Coupling of DAS/DTS sensing for the detection of leaks on tubing with the FEBUS A1 and the FEBUS T1-R

• leaks behind the casing

Leak detection on packer and precise localization (± 1 m) with the FEBUS A1

• a deformation/damage of the casing

A higher reactivity to any anomaly on the completion	Workover optimization	Increase of the profits	Prevention against the environmental and human risks



GEOTHERMY

One of the main challenges of our time is to sustain the environmental effort and to develop the renewable energies. Converting the heat of the subsurface geothermal energy in electricity is an answer to these goals.

The FEBUS A1 (DAS - Distributed Acoustic Sensing) provides a state-of-the-art acoustic sensibility and a very large range of frequencies.

The distributed fiber optic acoustic sensing is easy to deploy and significantly less expensive than traditional methods.

The EGS (Enhanced Geothermal System) can generate variations in temperature, pressure and induced seismicity. It is therefore essential to ensure continuous, real-time monitoring of the well and its environment by deploying a fiber optic cable in the well.

The FEBUS T1-R (DTS - Distributed Temperature Sensing) is Raman scattering to identify temperature changes in the well depth.

The FEBUS G1-R (DSS - Distributed Strain Sensing), based on Brillouin technology, detects the strain variations. This allows to verify that the cable is correctly positioned in the well and to control its integrity throughout the operation.

Fiber optic cable temperature and strain sensing along a well

Induced seismicity can be generated by geothermal production.

The FEBUS A1 (DAS - Distributed Acoustic Sensing) provides a real-time detection of any seismic activity produced by the reservoir operation. It makes possible to organize a rapid response and to regulate the production.

By using several optical fibers of a unique cable:

• the monitoring of induced seismicity is combined to the environmental properties changes due to the geothermal reservoir production (DAS + DTS + DSS)
• the distributed fiber optic measurement takes benefit from an easy deployment
• the deployment costs are optimized.

Fiber optic cable deployment in a well

Measurement of the pressure gradient of a geothermal well with the FEBUS G1-R 7 months after the deployment of the fiber

Thanks to very high resolution data, the production of the geothermal well and its security increase by preventing any environmental impact.



SEISMIC ON WELL

The FEBUS A1 (DAS) can be used to perform VSP (Vertical Seismic Profile) campaigns.

Our interrogator provides state-of-the-art sensitivity, distributed, continuous and real-time data for seismic acquisitions.



SUBSURFACE STORAGE

Acoustic data performed with the FEBUS A1 (DAS - Distributed Acoustic Sensing) and temperature data with the FEBUS T1-R (DTS - Distributed Temperature Sensing), allow to:

• identify liquid/gas and liquid/liquid interfaces using DTS measurements in case of quick dynamics

Localization of the liquid/gas and liquid/liquid interfaces with the FEBUS T1-R

• use "slow strain" data (FEBUS A1 - DAS) to estimate slower dynamics

Monitoring of the temperature changes with the FEBUS T1-R (DTS) and the FEBUS A1 (DAS)
thanks to "slow strain" measurements

Distributed and real-time measurements are achieved to optimize the subsurface storage operation.



HYDRAULIC FRACTURING

The FEBUS A1 (DAS) interrogator allows to monitor and secure the hydraulic fracking operations. Then it is possible to check:

• that the fractures are open enough to facilitate fluid extraction
• that undesirable secondary cracks do not occur
• that the proppant, injected to prevent the fractures from closing, is stable and to detect any backflow into the well
• that the cracks do not reach the surrounding control wells, creating cross-well interferences.

The integrity of the infrastructure is monitored, its production is optimized and the environmental risks caused by the activity are prevented.