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Capture critical performance and failures data
every 20 seconds
Vibration Memory Sub for Drilling Optimization
The SureDrill™ Vibration Memory Sub (VMS™) is a standalone downhole tool that measures, calculates and records axial, lateral and angular down-hole vibrations for retrieval and analysis at the surface. The VMS allows operators to assess the severity of downhole drilling shock and vibration, including stick-slip and whirl, and correlate the data to drilling events and equipment performance or failures.
Axial/Lateral Spectral Density of High-Vibration Event
Calculated Vibration Data
Every 20 seconds, the microprocessor calculates and stores:
- Maximum lateral acceleration – vector sum of X- and Y-accelerometer measurements
- RMS lateral acceleration
- Maximum half-second RMS lateral acceleration
- Maximum axial vibration – from z-accelerometer
- RMS axial acceleration
- Maximum half-second RMS axial acceleration
- Maximum and minimum angular speed (RPM)
- Stick-slip ratio and other rotational parameters
- Absolute date and time
Allow operators to assess the severity of downhole drilling shock and vibration, including stick-slip and whirl, and correlate the data to critical drilling events and equipment performance.
Features & Benefits
- Downhole vibration measurements are stamped by date and time for correlation with other data.
- Provides data in the form of ASCII text files which can analyzed by APS’s Vibration Data Viewer software or your own analysis software.
- 32 MB of memory; record up to ~250 hours of continuous data.
- Data is easily retrieved by accessing the data dump port on the sub and connecting it through an Interface Box to PC-based software that converts the stored data to a text file with acceleration levels as a function of real time.
Design
- Available sizes: 4.75 in. (121 mm), 6.75 in. (172 mm) and 8.00 in. (203 mm) O.D.
- Sonde-based tool with standard box and pin connections.
- Sonde-based design allows tool to be scaled up or down easily for use with other drill collar sizes.
- Vibration measurements are made using ± 120 g (lateral) and ± 60 g (axial) accelerometers, plus one fluxgate magnetometer rotation sensor.
Axial/Lateral Vibration vs. Time
Applications
- Characterize downhole conditions for future BHA planning
- Post-well analysis of equipment failures
- Provide evidence for use in warranty claim resolution
Tool Specifications
SureDrill-VMS Technical Data Sheet
General Specifications
| Mechanical | |||
| Tool Size | 4.75 in. (121 mm) OD 2.687 in. (68 mm) ID |
6.75 in. (172 mm) OD 3.25 in. (85 mm) ID |
8.00 in. (203 mm) OD 3.50 in. (89 mm) ID |
| API Connection | NC 38 Box/Pin | NC 50 Box/Pin | 6 5/8 Reg |
| Sub Material | Non-magnetic steel | ||
| Length | 66 in. (167.6 cm) | ||
| Weight (approx.) | 270 lb (122.5 kg) | 470 lb (213.2 kg) | 825 lb (374.2 kg) |
| Environmental | |||
| Pressure | 20,000 psi (137.9 MPa) | ||
| Operating Temperature | -40˚ to 302˚F (-40˚ to 150˚C) | ||
| Bending Limit | Connection-limited | ||
| Data Collection & Handling | |||
| Memory | 32 MB | ||
| Duration | Limited by battery life; ~ 250 hrs | ||
| Accelerometers | ± 120 g (X & Y axes), ± 60 g (Z axis); surface mount | ||
| Magnetometer | Two-axis fluxgate | ||
| Acceleration Data Range | ± 120 g (X & Y axes), ± 60 g (Z axis) | ||
| Rotation Rate Data Range | ± 1,500 RPM (± 157 rad/s) | ||
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