Core Barrel – Retrievable Memory Module (CB-RMM)
Description
The Core Barrel – Retrievable Memory Module (CB-RMM) may be deployed routinely with all standard IODP core barrels. It has been designed to capture incoming weight-on-bit, torque-on-bit, and pressure data from the Drilling Sensor Sub via a wireless inductive link.
The data are transmitted between two coils, one mounted in the DSS and the other mounted on the CB-RMM antenna. The DSS transmits the data continuously even when the CB-RMM is not present. When the CB-RMM is present, it recognizes the incoming data and stores them in the onboard memory. In addition to storing data from the DSS, the CB-RMM makes its own pressure and acceleration measurements, which are stored with the DSS data.
Applications
• Heave compensated evaluation
• Core barrel performance evaluation
• Sediment compaction
• Fluid pressure
Tool Specifications
Measurement Specifications
The Core Barrel – Retrievable Memory Module (CB-RMM) may be deployed routinely with all standard IODP core barrels. It has been designed to capture incoming weight-on-bit, torque-on-bit, and pressure data from the Drilling Sensor Sub via a wireless inductive link.The data are transmitted between two coils, one mounted in the DSS and the other mounted on the CB-RMM antenna. The DSS transmits the data continuously even when the CB-RMM is not present. When the CB-RMM is present, it recognizes the incoming data and stores them in the onboard memory. In addition to storing data from the DSS, the CB-RMM makes its own pressure and acceleration measurements, which are stored with the DSS data.
Applications
• Heave compensated evaluation
• Core barrel performance evaluation
• Sediment compaction
• Fluid pressure
Tool Specifications
| Temperature rating: | 185°F (85°C) |
| Pressure rating: | 10 kpsi (69 MPa) |
| Diameter: | 3.625 in (9.2 cm) |
| Length: | 155.38-184.25 in (3.94-4.68 m) |
| Weight: | 250 lbs (113.6 kg) |
| Memory: | 8 Mb |
| Acceleration sampling rate (x and z axis): | 50 Hz |
| Power source: | 24 “C” and 6 “AA” alkaline batteries |
| Battery life: | about 16 hrs |
| Top connection: | ODP GS fishing cup |
| Bottom connection: | Interchangeable core barrel-specific adapters |
Measurement Specifications
| Acceleration measurement range (HSA channel): | Option 1: ±4 g; Option 2: ±25 g |
| Pressure measurement range: | 0-10 kpsi (6.9 MPa) |
| Pressure resolution: | 1 psi (6.9 kPa) |