METHOD AND DEVICE FOR EXTRACTING PETROLEUM GAS FROM SEDIMENTARY ROCKS WITH GAS HYDRATE INCLUSIONS Russian patent published in 2023 - IPC E21B43/24 

FIELD: petroleum gas production.

SUBSTANCE: group of inventions relates to the production of petroleum gas from sedimentary rocks with gas hydrate inclusions and can be used in the development of gas hydrate deposits in the northern regions of the continent, as well as in shelf zones from productive formations saturated with gas hydrates. A device for extracting petroleum gas from sedimentary rocks with gas hydrate inclusions includes a well drilled into a gas hydrate deposit and fixed with a casing string and cement stone. The parent wellbore is equipped with a production string of pipes. The production string of pipes consists of the upper and lower sections connected by an intermediate connecting sub. The internal cavity of the sub is made with a conical seating surface with the possibility of supporting the seating cone. The production string in the sidetrack is provided with perforation, and for transporting the gas-liquid mixture from the sidetrack, a tubing string is placed in it, equipped with filter nozzles. The upper part of the lift column is connected to a hollow landing cone. The hollow landing cone is in contact with the landing ring provided for this purpose, installed in the gap of the threaded connection of the pipes of the casing string of the upper section. In the upper part of the lower section of the production string of the pipes of the parent well, an anchor device for fixing the whipstock and a suspension of the liner of the production string intended for transporting the coolant is installed. The lower part of the production tubing liner for transporting the coolant is limited by the position of the upper perforation radial channels in the lower section of the production tubing of the parent well pipes. In the upper section of the production string of the pipes of the parent well, an electric centrifugal pump installation is fixed on the tubing. A jet injection pump is mounted in the tubing hanger above the electric centrifugal pump unit for gas intake from the annular space of the well through the inlet channels. A method for extracting petroleum gas from sedimentary rocks with gas hydrate inclusions from underwater or underground gas hydrate deposits includes the decomposition of gas hydrates in the massif of their occurrence by heating to a temperature exceeding the temperature of their natural decomposition, by injecting through a pipe string and through a well into a gas hydrate deposit of a coolant and removing the produced gas to surface along said well.

EFFECT: increased efficiency of the process of decomposition of gas hydrate deposits.

3 cl, 3 dwg