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 @ 45° 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 WirelineCable 9m, 12m, 15m, 20m
|
|
Maximum Temperature Rating
|
150°C
|
|
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
|
