Decomposition characteristic test system for solid fluidization exploitation of marine non-diagenetic hydrate and method

Abstract

The invention discloses a decomposition characteristic test system for the solid fluidization exploitation of marine non-diagenetic hydrate and a method. The system comprises a methane source (1), anair compressor (3), a constant-flux pump (4), an intermediate gas container (7), an intermediate solution container (8), a high-pressure reaction kettle (12), a return pressure controller (16), a gasflowmeter (17), a computer (18), a temperature and pressure monitor (19), and a constant-temperature gas bath tank (20). The method comprises the following steps: (1) quartz sand is added into the high-pressure reaction kettle; (2) the methane source is pumped into the intermediate gas container, and experimental solution is injected into the intermediate solution container; (3) temperature is regulated to experimental temperature, the fluids of the intermediate solution container and the intermediate gas container are pumped into the high-pressure reaction kettle, an agitating motor is switched on, and a synthesis experiment is started; (4) solution is replenished into the reaction kettle; (5) an outlet valve is opened, a decomposition experiment is started, and decomposition characteristic parameters, such as gas production rate and accumulated gas production rate, are recorded. According to the invention, the principle is reliable, operation is easy and convenient, and the decomposition characteristics of hydrate particles under different operation conditions can be accurately evaluated.

Description

technical field [0001] The invention relates to an experimental testing device and method for decomposition characteristics of marine non-diagenetic hydrate solid fluidization exploitation process, belonging to the field of natural gas hydrate experiment. Background technique [0002] Natural gas hydrate is considered to be one of the most potential "future energy sources" because of its large reserves, wide distribution of resources, and high energy density. The decomposition product of natural gas hydrate is natural gas dominated by methane, and the combustion product is CO 2 and water are clean energy. In my country's South China Sea, there are huge reserves of marine natural gas hydrate resources, which are defined as non-diagenetic hydrates because of their shallow burial depth, no tight caprock, loose mineral deposits, low cementation, and easy fragmentation. Different from diagenetic hydrates studied in the past, marine non-diagenetic hydrates have uncontrollable an...

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Problems solved by technology

At present, the reported sedimentary hydrate decomposition experiments use the complete sand filling mode, and there is no crushing and stirring device, which cannot represent the characteristics of non-diagenetic hydrate being crushed and flow-decomposed in the pipeline during the solid fluidization mining process.

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