OFFSHORE NATURAL GAS EXTRACTION METHOD Russian patent published in 2010 - IPC E21B43/01 

FIELD: oil and gas industry.

SUBSTANCE: method involves collection of gas from gas flows above gas evolving sections of the bottom by means of dome gas collector installed on the bottom surface, transmission of gas from gas collector to accumulating capacity equipped with gas unloading devices, compaction of gas volume, supply of signal to the collecting ship at the specified filling of the accumulating capacity and shipment of its content to the collecting ship. As accumulating capacity, there used is dome capacity having positive buoyancy, open from below, and from above it is connected to the pipeline having buoyancy. At that, accumulating capacity is located in water column above the bottom so that its top can be located at the depth where water pressure exceeds the pressure of dissociation of natural gas hydrate at the temperature corresponding to the annual maximum of water temperature. Location of at least two gas flows is pre-determined; dome gas collector each of which is interconnected via pipelines to the cavity of accumulating capacity is arranged above each of them; besides at least outlet pipeline and pipelines of gas collectors are equipped with electric heating devices.

EFFECT: simplifying the design of the equipment providing the implementation, simplifying the arrangement of the gas extraction operation of collecting ship.

9 cl, 5 dwg