Method and apparatus for simulating gas hydrate accumulation process under one-dimensional condition

Abstract

The invention provides a method and a device for simulating the accumulation process of a gas hydrate under a one-dimension condition which mainly simulates the accumulation process of the gas hydrate by forming a hydrate in the inner chamber of an one-dimension high pressure reactor; the inner chamber of the reactor is divided into an upper part, a middle part and a lower part; the middle part is divided into an aquiferous porous medium filling area used for generating the hydrate; the upper part and the lower part are free spaces; the method includes: experiment gases are led into the innerchamber of the reactor from the lower part of the reactor to lead the experiment gases to seep from up to down and pass through the porous medium filling area; the hydrate is generated in the porous medium filling area and the experiment gases not reacted are led out from the upper part of the reactor; the forming speed of the hydrate is detected by detecting the flux change of the gases in the seeping process in the porous medium. The method and device can simulate the two forms of gas migration and water migration formed by the hydrate and can simulate the whole processes of the hydrate from nucleation inducing, gradual forming of the hydrate, the accumulation of the hydrate to trapping.

Description

technical field [0001] The invention relates to a method and a device for simulating the accumulation process of gas hydrates, especially natural gas hydrates, under one-dimensional conditions, and belongs to the field of resources. Background technique [0002] Gas hydrate is an ice-like white solid substance formed by natural gas and water under low temperature and high pressure conditions. It is widely distributed in the sediments of the ocean shelf and slopes and in the land permafrost. Because most of the natural gas components are methane, it is also called methane hydrate. According to the preliminary prediction of scientists, the organic carbon in natural gas contained in natural gas hydrates in the world is twice the total organic carbon contained in fossil fuels such as oil, natural gas and coal, and the total resources are about (1.8-2.1)×10 16 m 3 . my country's sea areas and exclusive economic zones have broad prospects for natural gas hydrate resources. Prel...

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Problems solved by technology

However, there are few reports on the simulation of gas hydrates, which are mainly diffusion-type. For real subsurface formations with water depths of hundreds to thousands of meters (experimental pressures can reach tens of MPa), methane The formation process of the main gas hydrate not only needs to simulate the two forms of gas migration and water migration of hydrate formation, but also needs to simulate the process of hydrate from nucleation induction, hydrate gradual formation, hydrate accumulation, and trapping. The whole process, the current research still lacks effective means of experimental simulation

At present, the research on the mechanism of gas hydrate accumulation at home and abroad is still insufficient

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