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... a portable work class ROV called Support Submersible 2500 wherein the ROV of ROSUB 6000 is integrated with suitable scientific sensors and sonar to explore the gas hydrate site for selecting suitable site for sampling operation.(FOR MORE DETAILS- ....) |
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ROSUB DEEP WATER SEA TRIAL |
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... a portable autonomous coring system capable to recover to the maximum of 100 m core sample upto the depth of 3000 m water depth. System has the pressure core sampler to collect gas hydrates at in-situ pressure conditions. |
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Capability of seafloor sampling is limited in obtaining surface sample and or to the length of 20 m by piston core sampling devices. Long core samples are possible only be ship based drills through ocean drilling program to cater deep ocean research or industrial demand. Drilling at gas hydrate site in Indian continental margins had proved occurrence of gas hydrate 40mbsf at 1017 m water depth. Hence based on the evolution of remote drilling system in the past two decades sea floor based sampling technology to collect more than 100 m long core samples has been proposed. Primary motivation of Autonomous Coring System development is to validate the gas hydrate occurrence by inexpensive sea floor based long core sampling technique. By this means system will be placed precisely at the selected site for ground truth validation. |
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Autonomous Coring System (ACS) is under development by NIOT in joint collaboration with M/s Williamson & Associates, Seattle, USA. System is capable to take 100 m long cores from ocean basins up-to the maximum depth of 3000 m. ACS is developed by wire-line drilling technology at USA with complete technology transfer from design to system realization and sea trials in India. System is integrated with pressure core sampler for the recovery of gas hydrates at in-situ pressure condition.
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Major Subsystems are:
Frame/legs subsystem
The drilling mast subsystem
The drill tool magazine subsystem
The tool handling system
The hydraulic subsystem
Power and control electronic subsystem
The sensor subsystem
Control hardware and software
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Specification: Operable Depth : 3000 m
Size: H 5.7 m X W 3.2 m x L 8.1 m
Weight: 12 T in air with samples
Wire line Drilling Technology
System designed for 100 m core recovery enhancement possibility to 150 m recovery
Core liner length 3 m each (50 core liners are mounted in Magazine)
HQ size inner tube (63.4 mm core diameter)
Control systems with Opto 22 hardware and software
Power –100 kW (3000 VAC, 50 Hz, 3 phase)
Pressure core sampler from QD technology for in-situ gas hydrate sampling
Emergency release mechanism
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Achievements: Completion of system design, fabrication and subcomponent identification (August 2008)
Complete integration of all sub systems for sea trial and testing operation (February 2009)
Land based drilling in concrete recovered 112 m continuous cores (May 2009)
First phase of sea trial recovered 35.59 m core by wire line operation.(July 2009)
Second phase of sea trial at 100 m depth had cored up to 55.15 m length with intermittent wire line operation for the recovery of core samples (August 2009)
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Future Activities: 1. Completion of 100 m depth sea trial to recover 100 m long core by wireline method at USA
2.Deep water sea trials and ground truth validation at gas hydrate site in India
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Autonomous Coring System for 3000 m |
