OPERATIONAL AREAS
The PAG Cat 3 ROV Coring System will benefit for:
- Coring hard sediment
- Fractured igneous rock
- Friable carbonate rocks
- Near seabed areas where soft and hard layers are stacked together
- Hydrotermal vents with large environmental concerns
- Shallow water areas, atolls
- Ice covered arctic oceans or areas with frequent ice
- Seabed mining nodule sampling
CONCERNS
Category 1 Vessels
- Have unavoidable Weight on Bit (WOB) fluctuations
Coring Carbonated layers may be pulverized
Drill string type coring systems for sulfide coring has historically captured less than 5%
- Require high flow of fluid for drilling/coring
Flushing away sediment particles that best should be retrieved with core
Category 2 Robotic Drills
- No WOB fluctuations.
- Need a surface vessel location directly above
- Used when Cat 1 not is available nor efficient for specific target or represent lower cost
Category 3 PAG ROV Coring System
- No WOB fluctuations.
Actual weight on bit will be accurately monitored in real-time and will be continuously adjusted to optimize the coring quality
- Require high flow of fluid for drilling/coring
Required fluid flow are minimal and allows the core to be in near pristine condition
BENEFITS FOR PAG CATEGORY 3 CORING SYSTEM
The advantage of using a lightweight ROV installed coring systems is their flexibility. In all locations where there is no need
for deep seabed penetration, the scientists can use any standard work class ROV for coring and capturing seabed samples
with its original deepwater pressure condition. This means that the system is readily available for a low cost sampling
operation. Large Category 1 vessels or Category 2 systems are not required.
- Attached to a Work Class ROV
- Low Cost for shallow coring targets
- Vertical Coring on hard seabed rock surface
- Dead-ROV Auto-Release System for emergency release of ROV
- Captures 5 cores with its deepwater pressure condition in each dive
- Can operate in up to 15 degrees sloped seabed
- Cores are gyro-orientated
- Environmentally Friendly
MAIN DATA
Operating Depth: Equal to Work Class ROV Depth
Rating typically 4500-6000m
Power Requirements: 140 l/min at 210 Bar from Host ROV Hydraulic Pump
Note that during ROV Coring System Operation, minimal power is required to ROV as it is just in stand-by mode
resting on top of the coring system.
Data Transfere: Interfaced to Host ROV Telemetry System
Main Core Sampling: 1 each 3m sub seafloor, core diameter 31mm
ROV Anchor Cores: 4 each 1m sub seafloor, core diameter 72mm
Seabed Slope: Max 15 degrees for true vertical drilling
Size & Weights: Variable to meet Host ROV Payload
In-situ Samples: Up to 5 samples for each dive
