NATURAL GAS OFF-SHORE DEVELOPMENT Russian patent published in 2010 - IPC E21B43/01 

FIELD: oil-and-gas industry.

SUBSTANCE: invention related to equipment for natural gas off-shore exploration, particularly the gas, which is freely released at gas evolving bottom areas. The complex includes a gas-collecting unit, executed with ability of installing under water and gas catching for its following transmission to a gas holder, which executed with ability of positioning in water depth and lifting to the surface and to service vessel. The gas holder has buoyancy tends to zero. It's case executed with ability of keeping thermal baric condition at level, which excludes natural gas hydrate dissociation, for that it is equipped with heat insulation arrangements and/or cavity cooling arrangements and/or executed in a way that internal pressure is not less than the natural gas hydrate dissociation pressure at temperature which keeps in the gas holder cavity. The gas holder equipped with a gas receiving device from gas collecting unit, which executed with ability of its cavity to be connected to water basin, also with a gas discharge device. The gas holder unit contains a domed accumulating tank, opened from the bottom, located over the domed gas collectors and connected to them via pipeline, also equipped from the top with a vertical discharge pipeline with remote controlled valves. The discharge pipeline, gas collectors pipelines and the accumulating tank cavity equipped with electrical heating device. The discharge pipeline end executed with ability of dismountable connection to the gas holder cavity and located at depth, where pressure in gas holder cavity, at its intercommunication to the water basin, is not less than the natural gas hydrate dissociation pressure, at temperature conforms to annual water temperature maximum in the accumulation tank dislocation zone. The complex equiped with gas holder submersion and its connection to the accumulating tank discharge pipeline tools. A tag boat used as the service vessel, executed with gas holder tagging ability, equiped with impingement cooling system and electrical power generator for the gas holder power supply.

EFFECT: possibility of gas compression using environment potential energy and receiving fresh water together with gas.

3 cl, 3 dwg