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HydroSeis™ - Seismic-While-Drilling Source
This tool incorporates a flow interruption valve with a sweep modulator, designed to provide a useful seismic source at the bit for reverse vertical seismic profiling (rVSP). This source allows seismic-while-drilling with a PDC bit. The tool, has been used to demonstrate seismic profiling and look-ahead seismic imaging-while drilling.
HydroSeis™ provides:
- Real-time reverse vertical seismic profiling while drilling
- High-resolution look-ahead imaging while drilling
- Independent compression and shear wave source
- Vertical or inclined wellbore
- Early warning of gas kicks
- Crosswell surveys
- All-metal construction for high-temperature, high-pressure, sour gas service.
Tempress is seeking opportunities for a field trial of this tool.
Bit Face Pressure Signal, psi
Time, seconds
HydroSeis™ Tool Specifications| Bit size | 8.50 inch (7.75 min.) | | Tool OD | 6.5 inch | | Upper connection | Box, 4.5 API IF (API NC50) | | Lower connection | Box, 4.5 API REG | | Length | 40 inch | | Weight (incl. Cartridge) | 250 inch | | Cartridge diameter | 3.50 inch | | Cartridge length | 28.7 inch | | Cartridge weight | 41.9 inch | | Bit nozzle flow area | 0.589 in2 (three 0.500” nozzles) | | Valve min. flow area | 1.18 in2 (including bypass ports) | | Flow rate | 300-600 gpm | | Mud type | water or oil based | | Differential pressure across valve | 170 psi @ 10 ppg 400 gpm | | Differential pressure across bit | 200 psi recommended, 400 psi max | | Cycle rate range | 5-20 Hz | | Upstream pulse amplitude | 800 psi @ 10 ppg | | Suction pulse amplitude | 280 psi @ 10 ppg | | Maximum Lost Circulation Material | .375 inch |
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