PRODUCTION METHOD OF UNDERWATER DEPOSITS OF GAS HYDRATES, AND UNDERWATER PRODUCTION COMPLEX OF GAS HYDRATES Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: pipeline is routed from a platform on sea surface to deposits of gas hydrates at sea bottom, which consists of an external pipe and an internal pipe. Sea water heated to 30...40 degrees Celsius is transported via the internal pipe immediately to a gas hydrate deposit. Bubbles of gaseous methane are transported together with water via the external pipe upward to the platform. Methane is separated from water. Methane is supplied to tanks or to the main pipeline. When sea water heated to 30...40 degrees Celsius is being supplied, granite chips are supplied in the ratio of 1:2 to fill in the inner volume of the formation, which has been released at extraction of gas hydrates. Underwater production complex includes a platform with a pipeline consisting of an internal sea water supply pipe immediately to gas hydrate deposit, which is heated to 30-40 degrees Celsius, and granite chips in the ratio of 1:2, and an external pipe for transportation of gaseous methane bubbles together with water upwards to the platform to separate methane from water. Besides, there are pumps, a gas-turbine plant rated at 6 MW and a thermal power plant to generate energy due to thermobaric difference of sea water. The platform is made in the form of a movable sea unit with a submersible tank by means of a telescopic device, inside which a pipeline made from propylene is arranged. Diameter of the external pipe increases in upward direction.

EFFECT: reduction of environmental consequences at industrial development of underwater gas hydrate deposits and improvement of carrying capacity at transportation of gas hydrates.

3 cl, 1 dwg