Injection of fluids in the subsurface is a frequent operation in hydrocarbon producing projects. Injection can have different objectives:
- Increase pressure in the producing formation to boost hydrocarbon recovery
- Dispose of wastewater and cuttings from well drilling
In both cases, OCTIO WellWatch systems provide:
- Monitoring of caprock integrity and fault reactivation for a safe injection
- Possibility to increase injection flows and capacity due to the improved safety
- Mapping of plume migration
- Monitoring of crack formation for prevention of water breaktrough into producing wells
The Oseberg field case
A 172-node WellWatch system is operating 24/7 at the Oseberg field since 2013.
This was the first offshore system word-wide with microseismic monitoring as main motivation.
The system is saving the operator 1.2 M$ per year, by enabling injection of waste water, and avoiding costly, weather-dependent shipping of waste to land.
A part from its main motivation of detecting microseismic events, the OCTIO WellWatch system at Oseberg has been used to:
- Significantly improve the imaging of regions of the reservoir by using active seismic
- Investigate gas leakages on the shallow sediments through interferometry
- Investigate detectability of CO2 through changes in sound velocity in water