Marine gas hydrate electronic-spraying pump composite exploitation method and apparatus

Abstract

The invention discloses a marine gas hydrate electronic-spraying pump composite exploitation method and an apparatus used for exploiting marine gas hydrate. According to the invention, a multi-phase separating and storing system is connected to a mixed layer of marine gas hydrate and sediment through a gas exploitation pipe; an ejector pump under the sea-level is connected to the gas exploitationpipe in series; an electric centrifugal pump is connected to the ejector pump through a power fluid pipe which is loosely sleeved in the gas exploitation pipe; compressed seawater injected from the electric centrifugal pump through the power fluid pipe is adopted as power fluid; the power fluid enters from a nozzle of the ejector pump, such that a low-pressure section is formed at the outlet of the nozzle; the mixture of natural gas, seawater and sediment is absorbed through the gas exploitation pipe and the ejector pump to the low-pressure section of the nozzle outlet, and is mixed with the power fluid, such that mixed liquid is formed; the mixed liquid enters the gas exploitation pipe from a liquid outlet of the ejector pump, and flows upwards along the annular hollow chamber between the gas exploitation pipe and the power fluid pipe to the multi-phase separating and storing system. With the method and the apparatus provided by the invention, marine gas hydrate decomposition efficiency can be improved, and energy required by natural gas hydrate decomposition can be saved.

Description

technical field [0001] The invention relates to a method and a device for exploiting seabed natural gas hydrate, which are used for exploiting seabed natural gas hydrate. Background technique [0002] Submarine gas hydrate reserves are huge, and it is very likely to become an important source of fossil energy in the future. At present, the mining technologies for low-abundance natural gas hydrates scattered on the seabed mainly include solid mining methods, hydraulic lifting methods, thermal stimulation mining methods, and microwave mining methods. For example: Chinese Patent No. 200710168759.0, titled "A Submarine Natural Gas Hydrate Exploitation Method and Device" discloses a solid mining method, using a subsea hose to inhale natural gas hydrate in solid form, and transport the mud to the sea surface through a subsea transfer station , and then use high-temperature seawater to decompose the collected natural gas hydrate. The hydraulic lifting method is to mine natural ga...

AI Technical Summary

Problems solved by technology

Subsea equipment has complex structure, many moving parts, unstable liquid production, and low equipment reliability

The Chinese patent application number is 200910235236.2, and the name is "A Subsea Natural Gas Hydrate Exploitation Method", which discloses a thermally stimulated exploitation method. The main object of this method is natural gas hydrate in the seabed rock formation. Two wells need to be drilled, which is costly and expensive. The process is complicated, the economy is poor, the heat utilization efficiency is low, and the heating area is small

[0003] To sum up, the existing gas hydrate mining methods and equipment have not considered the characteristics of low abundance, wide distribution area, and thin distribution thickness of gas hydrate, nor have they considered how to make full use of natural energy to make the seabed surface The natural gas hydrate collected on the sea surface requires the construction of a subsea transfer station, the installation of a microwave generator, or the drilling of branch wells, etc., and the process is complicated.

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