Orbital Eccentric-mass source emitting P & S waves at 30–200 Hz from inside the borehole — permanently installed or retrievable, fluid coupled or clamped.
The GPUSA Downhole Orbital Vibrator (DOV) generates unbalanced centrifugal forces through rotation of an eccentric mass, producing radial vibration in all directions. This orbital motion emits both P and S waves simultaneously, with output frequency controlled directly by motor RPM. At 200 Hz the DOV exceeds 2,400 lb of force.
Deploying the source at depth and below the near-surface weathered zone reduces signal attenuation by 95% or more. Radial vibratory motion minimizes tube-wave noise. A built-in ±5,000 g digital accelerometer delivers real-time QC data and correlation/deconvolution capability. Up to eight source modules can be stacked on a single downhole cable for multi-level array acquisition. Test results validated by Lawrence Berkeley National Laboratory.
| Parameter | Units | Value |
|---|---|---|
| Frequency Range | Hz | 30–200 |
| Force Generated (at 200 Hz) | pounds-force | >2,400 |
| Max. Source Modules per Cable | number | 8 |
| Weight (per source module) | lb | 36 |
| Length (per source module) | inches | 48 |
| Max. OD (source module) | inches | 3.2 |
| Downhole Cable Diameter | inches | 0.930 |
| Downhole Cable Break Strength | lb | 6,000 |
| Electric Motor Output | HP | 2.5 |
| Power Requirement | V / Hz | 240V, 3-Phase, 50–60 |
| Maximum Operating Depth | ft | 1,500 |
| Duty Cycle (in well fluid) — borehole fluid cools the motor; 60 s max in air (3 min rest between runs) | % | 100 |
| Operating Temp. — Downhole | °F / °C | −20 to +150 °F (−29 to +66 °C) |
| Operating Temp. — Topside | °F / °C | 20 to 120 °F (−7 to +49 °C) |
*Specifications subject to change without notice.
Tell us about your project — environment, depth targets, and objectives — and we’ll come back with a preliminary scope.