Water/EOR Injection Stimulation Monitoring
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Periodic water/EOR injection profiles can detect channels or leaks and lead to the development of remediation strategies to maximise sweep through the reservoir. Silixa’s ArrayLog™ services utilise distributed acoustic (iDAS™) and distributed temperature (ULTIMA™ DTS) data acquired on permanently installed fibre optic cables to give injection profiles across the entire wellbore.
The iDAS and ULTIMA DTS can be deployed periodically to log injection profilesor monitor well stimulation operations by running a fibre optic log as either a slickline, cable or coil tubing intervention. The optical fibre behaves as a sensor array making it possible to log the entire well path continuously without the need to move the cable and so providing information about dynamic flowing conditions in a way in which conventional sensors cannot.
Distributed temperature data has been used in determining injection profiles through warm-back analysis for many years however injection is required to be suspended to observe the warm back and its ability to generate accurate profiles in horizontal wells is limited. The addition of phase-coherent distributed acoustic data (iDAS™) together with advanced acoustic processing allows injection profiles to be created during injection.
Silixa leads the way in its unique combined approach that employs both temperature and acoustic data to create injection profiles or monitor well stimulation. Our proprietary computational models are able to create injection or stimulation profiles by measuring the acoustic response of the wellbore.
Field software allows for real-time integrated visualisation of temperature and spectral acoustic data for quality control and initial evaluation while a post processing platform facilitates advanced data processing and versatile plotting options so that corroborating answers from independent measurements, iDAS™ and ULTIMA™ DTS, can be presented as actionable information to the user.
Silixa offers a range of fibre optic cables optimised for iDAS and DTS measurements to ensure a safe, efficient and long-lasting monitoring solution.
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Benefits
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- Rapid identification injection/stimulation profiles at one point in time with a single sensing array
- Continuous depth and time monitoring better describes changing injection/stimulation patterns
- Supporting answers from multiple measurements improves decision confidence
- Data acquisition on either slickline, cable or coiled tubing intervention
- Allow well integrity “health check” of entire wellbore at no additional cost
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Applications
- Water or other types of EOR floods
- Stimulation operations such as acidification
- Detection of behind casing fluid movement
- Caprock integrity
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