Borehole Optical Seismic System (BOSSTM)
BOSSTM is a completely new innovation for Avalon Sciences. The system is entirely passive downhole with sophisticated electronics remaining at the surface in a controlled environment.
The high continuous operational temperature rating (200°C) and solid mechanical coupling system will deliver a long term deployment solution, ideal for deep-well subsalt 4D VSP and high resolution fracture monitoring surveys. The bespoke system coupling design and absence of downhole electronics allows for for discrete or permanent/semi-permanent operation.
The system has already successfully completed its first commercial surveys in 2021 and 2022.
- No Downhole Electronics
- Passive Fibreoptic Borehole System
- 200°C Continuous Operation
- 20,000 PSI Pressure Rated
- High Sensitivity
- Low Noise
150 Kg Coupling Force on passive arm
The array utilises 3 component optical omni-directional geophones specially developed by Avalon to cope with hostile deep well conditions. These broadband sensors are low noise, extremely sensitive and will work in any orientation from vertical through to horizontal. Sensitivity, noise floor and bandwidth have been optimised to cover both VSP and fracture monitoring.
The system is fully expandable from a small microseismic 8 level system up to 96 stations for large 3D VSPs. The fibreoptic system can also survive more permanent deployment due to metal to metal C-rings throughout, meaning it can be considered for life-of field installations.
The stations are deployed as standard with optical wireline or on jointed or coiled tubing as an option. The array can be spaced at just a few meters or at several hundred meters for total well coverage. Tool coupling can be bespoke, with an option of patent pending non-electrical delayed clamp arm design, giving up to 150kg locking force.
| BOSSTM Specifications | Up to 100 Receivers |
| Dynamic Range: | >100db |
| Noise Floor: | <50 ng/√Hz |
| Distortion: | <0.01% |
| Bandwidth: | 1-800 Hz |
| Sensors: | Omnidirectional Fibre Optic Accelerometer |
| Max Temp: | 200oC |
| Max Pressure: | 20,000psi (1400 bar) |
| Wireline | Optical |
| Control Panels | GSP & SULIS Interrogator |
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