Method and device for natural gas hydrate exploitation with in-situ catalytic oxidation thermochemistry method

Abstract

The invention relates to a method for using original catalyst oxidization thermal chemical method to product natural gas hydrate, and a relative device, wherein said method is characterized in that: pouring hydrate decompose accelerant into the hydrate storage layer to decompose the natural hydrate; using oxidant to catalyze and oxidize the fuel to heat the heat liquid in the catalyst oxidization burner; then pumping the liquid into storage layer to support the heat needed in the decomposition of natural gas hydrate; then pouring the CO2 gas generated by burning into hydrate storage layer; and the inventive device comprises: catalyze oxidize burner 14, as one coaxial sleeve reactor, while the tube is the catalyze oxidize burning area and the frame is divided into preheating section and heat exchanging section. The invention can combine the mechanical method and the CO2 exchange method, to improve the producing speed and confirm the stability of seabed.

Description

technical field [0001] The invention relates to the exploitation technology of natural gas hydrate, in particular to a method and a device for exploiting natural gas hydrate by an in-situ catalytic oxidation thermochemical method. technical background [0002] Natural Gas Hydrate (Natural Gas Hydrate, referred to as Gas Hydrate) is a non-stoichiometric, ice-like, cage-type crystalline compound formed by low-molecular-weight hydrocarbons in water and natural gas under low temperature and high pressure conditions. Natural gas hydrate has the characteristics of a host-guest material. Water molecules (host) form a spatial lattice structure through hydrogen bonding, and gas molecules (guests) fill the cavities between the water molecule lattices through van der Waals forces with water molecules. . Natural gas hydrates are mainly methane hydrates, most of which occur in the seabed, which have the advantages of large reserves, wide distribution, shallow burial, high energy density...

AI Technical Summary

Problems solved by technology

U.S. Patent US6994159B2 and Japanese Patent JP09158662 propose to inject thermal fluids such as hot water and steam into hydrate reservoirs through production wells to promote hydrate decomposition. Large loss, low utilization rate of heat energy

Chinese patent CN1609409A proposes a method and device for exploiting natural gas hydrates by using microwave heating, and U.S. patent US6148911 proposes mining natural gas hydrates by underground electric heating, but these methods all require electric heating, which has low energy utilization efficiency and complicated mining devices

But CO 2 The problem with the displacement method is that the CO formed 2 Hydrate solids tend to wrap on the outer surface of methane hydrate, resulting in incomplete decomposition of gas hydrate and extremely slow replacement reaction

Chinese patent CN1587642A refers to the mining and separation mode of land mines and proposes to use underwater automatic excavation machinery to mine solid natural gas hydrate, and then use sediment separation, hydrate decomposition and other processes to mine natural gas hydrate. These ground decomposition mining methods all have a small mining range, Underwater automatic mining equipment has high technical requirements, which seriously damages the geological structure of the seabed, and is likely to cause problems such as well bottom collapse and landslides

Various hydrate mining methods have their own advantages and disadvantages. It is difficult to achieve economical and effective mining of natural gas hydrate simply by using a certain mining method. It is necessary to integrate the advantages of various methods and learn from each other to achieve economical, efficient, and efficient natural gas hydrate production. safe mining

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