A method of gas hydrate solid-state fluidized mining excavation indoor experimental device

A technology of solid fluidized mining and gas hydrate, applied in the direction of material inspection products, fuel oil testing, etc.

Active Publication Date: 2016-09-07
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, there are still some key technical problems in the process of solid fluidization mining, especially in the mining process, such as the change of temperature and pressure around natural gas hydrates during the crushing process and the resulting impact on the phase stability of hydrates, hydration after crushing The particle size distribution of gas hydrate particles, the proportion of seawater required for hydrate fluidization, the drillability evaluation of gas hydrate deposits, etc.

Method used

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  • A method of gas hydrate solid-state fluidized mining excavation indoor experimental device
  • A method of gas hydrate solid-state fluidized mining excavation indoor experimental device
  • A method of gas hydrate solid-state fluidized mining excavation indoor experimental device

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specific Embodiment 1

[0039] In this specific example, the simulation will describe in detail the mining, excavation and fluidized collection of natural gas hydrate in a water depth of 1500m with a seawater pressure of 15MPa and a fluidized seawater flow rate of up to 8L / s. The seawater injection device adopts a pump that can stably provide a seawater flow rate of 0-8L / s under various pressures of 0-15MPa as the main component. The flow, temperature and pressure are monitored by the pressure gauge, thermometer and flowmeter involved in the seawater injection device as auxiliary control components.

[0040] First, transfer the natural gas hydrate sediment sample prepared in the large sample preparation tank to the mining tank, and cover the upper end cover matching the lower tank body; then inject cooled cold seawater, keep the temperature and pressure constant to simulate Real seabed temperature and pressure conditions.

[0041] Move the prepared natural gas hydrate sediment samples to the mining ...

specific Embodiment 2

[0048] On the basis of specific embodiment 1, after the crushing of natural gas hydrate sediment particles begins, monitoring the temperature and pressure changes in the kettle body, the phase state changes of natural gas hydrate and the particle size distribution of sediment particles during the crushing process , collect a small amount of fluidized material samples during the fluidization process, and analyze the content of each phase and particle size distribution.

[0049] First, the sampling container is evacuated. During fluidization, the valve connecting the sampling container and the fluidization pipeline is closed. After the fluidization starts, the valve can be opened at any time to obtain a sample of hydrate fluidization. The samples are mainly used for the test of particle size distribution, air content and single-phase ratio of slurry.

specific Embodiment 3

[0050] On the basis of specific embodiment 1 and specific embodiment 2, it also includes a waste pipe connected to the bottom of the excavation tank through a second valve. After the experiment is completed, open the valve connected to the waste tank to collect the hydrate deposits and seawater involved in the tank.

[0051] The implementation scheme of the patent application of the present invention combines the experimental simulation of the experimental process with the numerical simulation, and solves the key technical problems of the excavation and fluidization modules in the solid fluidization mining process of natural gas hydrate in the shallow surface layer of the seabed. The experimental device can be used to analyze the phase state change of natural gas hydrate during mechanical crushing, the influence of different crushing methods on phase state change, the particle size distribution of natural gas hydrate particles under different mechanical crushing conditions, and...

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Abstract

The invention provides a laboratory experiment device and method for solid fluidization exploitation of a gas hydrate. The laboratory experiment device comprises a sea water injection device, an excavation experiment main body module and an experiment data information sampling module. According to the laboratory experiment device and method, a cutter is directly utilized for mechanical crushing of hydrate sediment under the circumstance that the temperature pressure in an exploitation kettle is the same as the actual pressure at the sea bottom, and sea water is injected into the exploitation kettle to ensure that the crushed hydrate particles flow together with the sea water, so that the phase change, the particle diameter distribution and the fluidization effect of the hydrate during mechanical crushing can be simulated, and a theoretical support is provided for solid fluidization exploitation of a non-diagenetic hydrate.

Description

technical field [0001] The invention relates to an indoor experimental device and method for gas hydrate solid fluidized mining, in particular to an indoor experimental method and device suitable for seabed non-diagenetic hydrate solid fluidized mining. Background technique [0002] Natural gas hydrate is an alternative energy source with development potential, and its total amount is about twice that of other fossil energy sources combined. The natural gas hydrate resources in the South my country Sea alone can be used by my country for 362 years. About 85% of the gas hydrates occur in the shallow sediments of the deep seabed in the form of weak cementation (non-diagenetic). In recent years, many countries have carried out in-depth research on natural gas hydrates, and exploring efficient mining methods for marine natural gas hydrates has become a research hotspot in the world. At present, natural gas hydrate production methods include injection method, depressurization m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/22
Inventor 王国荣王川张亦驰周守为谢真强付强周旭王雷振
Owner SOUTHWEST PETROLEUM UNIV
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