Marine natural gas hydrate reservoir remodeling and exploiting device

Abstract

The invention belongs to the technical field of marine hydrate sample simulation, and provides a marine natural gas hydrate reservoir remodeling and exploiting device. The device comprises a covering layer pressure control system, a hydrate exploitation system, a hydrate storage system, a gas supply system, a water supply system, a temperature control system and a data acquisition system, and an outer lifting rod in the covering layer pressure control system drives a cover layer of a hydrate reservoir to move so as to simulate acting force of different water depths on the hydrate reservoir; a second guide driving screw cylinder in the hydrate exploitation system drives a shaft to move up and down to adjust the penetration depth of the shaft, different exploitation well heights can be simulated, and the phenomenon that hydrate grows along the shaft when generated is avoided; and by changing a pore structure of a surrounding layer, surrounding layers with different permeability can be simulated. According to the device, the real occurrence condition of the hydrate reservoir can be effectively and accurately simulated, and theoretical and experimental support is provided for actual exploitation of the natural gas hydrate.

Description

technical field [0001] The invention belongs to the technical field of marine hydrate sample simulation, and more specifically relates to a marine natural gas hydrate reservoir remodeling and exploitation device. Background technique [0002] Natural gas hydrate is a new type of high-efficiency clean energy with wide distribution, large scale and high energy density. It is an important natural gas resource that can be commercially developed in the future. It is mainly stored in seabed sediments and permafrost. However, marine gas hydrates are different from conventional oil and gas resources. They form solid-state reservoirs and have complex conditions. They are generally distributed in marine sediments hundreds of meters below the seabed, and have the characteristics of high pressure and low permeability. [0003] At this stage, due to the difficulty in the exploitation of marine gas hydrates, the complete exploitation technology is not yet mature, and a large number of lab...

AI Technical Summary

Problems solved by technology

At present, most of the natural gas hydrate simulation systems owned by the vast majority of hydrate laboratories in the world are just simple pressure vessels, which cannot reflect the actual occurrence environment of the seabed more realistically, and are not true to the occurrence state of marine gas hydrate. simulation

In addition, before simulating the decomposition process of natural gas hydrate in the laboratory, it is inevitable to pre-generate natural gas hydrate in the reaction vessel. Wellbore growth, resulting in uneven gas hydrate formation

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