DOWNHOLE
DDS-250
DDS-250 – Downhole Shuttle
PRODUCT DETAILS
The DDS-250 is a four-channel, digital downhole shuttle, specializing in multi-level, real-time, continuous, high-definition seismic acquisition.
FEATURES
- 24-bit x four-channel digitizer in each shuttle
- Ultra low-noise digitizer enables recording of low-amplitude microseismic events
- Slim hole shuttle 2.50 inch OD – less than 63 mm
- 3C or 4C Sensor Packages available
- 3C tri-axis orthogonal geophone
- 4C tri-axis orthogonal geophone and hydrophone
- Dual-element OMNI 2400 high-output geophone sensors
- Deepender 5000 hydrophone model for four-component recording
- Solid-machined titanium shuttle body minimizes mechanical resonance
- High-resolution and high-frequency recording
- Selectable open-close motor control for each shuttle
- Special power boost operation control
- Direct connection sub arrays, armored wireline
- Flexible or rigid interconnects may be connected back-to-back to form longer intervals
- Maximum distance between DDS-250 devices is 50 meters
- Maximum temperature rating 150°C
- Maximum pressure rating 20,000 psi
- Up to 32 four-component levels per well deployment
MECHANICAL SPECIFICATIONS
| Outside Diameter | 63 mm (2.50 in.) |
| Length | 157 cm (62 in.) |
| Tool Weight | 18 kg (40 lbs.) |
| Anchoring System | Electromechanical in each Shuttle |
| Anchoring-to-Weight Ratio | 10:1 @ 45o angle |
| Anchoring Motor Power | 24 VDC per Shuttle constant 0.5 Amp |
| Time-to-Anchor | ~30 seconds per shuttle @ 6″ |
| Tool Anchoring Range | 102–305 mm (4-12 inch) |
| Points of Contact | 3 points, plus Anchor Arm |
| First Mechanical Tool Resonance | > 650 Hz |
| Sensor Package | 3C with dual-element OMNI-2400 |
| Interconnect Options |
Rigid Tubing (stainless steel) 3m, 6m, 9m Flexible Armored Wireline Cable 9m, 12m, 15m, 20m |
| Maximum Temperature Rating | 150oC |
| Maximum Pressure Rating | 20,000 psi |
DDS-250 4-ch x 24-bit DIGITIZER SPECIFICATIONS
| Sampling Rates | ¼, ½, 1, 2, and 4 ms |
| Pre-Amplifier Gains | 0 dB 8 dB 19 dB 31 dB |
| Equivalent Noise @ 2 ms | 1.590 μvolts rms 0.674 μvolts rms 0.264 μvolts rms 0.176 μvolts rms |
| Maximum Input Signal | 1.590 vrms 0.635 vrms 0.187 vrms 0.045 vrms |
| Gain Accuracy | < 1% |
| Frequency Response | 3 to 1.6 KHz |
| Anti-Alias Filter | 80% Nyquist |
| Instantaneous Dynamic Range | 120 dB |
| Cross-Feed Isolation | > 100 dB |
| THD | 0.0018% |
| System Timing Accuracy | Better than 1 PPM |
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