UNDERWATER DRILLING RIG Russian patent published in 2014 - IPC E21B7/12 E21B15/02 E21B19/04 

FIELD: mining.

SUBSTANCE: underwater drill rig comprises a drilling module with a drill floor, bearing base, cassettes with pipes and tool/equipment. The cassettes are arranged under the drilling module and can be replaced as pipes and tools/equipment are used. The drilling module is fixed on the bearing base and is fitted with the device for its filling with a neutral gas or gas with the decreased oxygen content with the pressure equal to overboard one. The drilling module is fitted with a wellhead funnel located at the centre, and necks for feeding of pipes and tools. The cassettes are located under the drilling module shifted from the centre and directly under the necks for pipes feeding.

EFFECT: simplification of design of underwater drill rig and increase of speed of feeding of pipes and drilling tools, equipment to a hole mouth.

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