Experimental simulation researching device and experimental method of disaster induced by exploitation of undersea hydrate with compact overlying strata

Abstract

The invention relates to an experimental simulation researching device and experimental method of disasters induced by exploitation of undersea hydrate with compact overlying strata. The device comprises an atmosphere-deepwater-stratum natural environment visible simulation system, a natural gas hydrate injection-production simulation system, a temperature control system, a pressure control system, a data collection system, and an image collection system. The system has the advantages of being reasonable in design, complete in function and convenient to operate, by means of the method, effective simulation operation can be conducted on the disasters induced by the exploitation of the undersea hydrate with the compact overlying strata, real-time monitoring is conducted on related data in the simulation process through corresponding temperature, pressure and gas concentration sensors, and image collection is conducted on the simulation process by using photographing devices in the wholeprocess. The device and the method have a certain guiding meaning on safe and high-efficient exploitation of undersea natural gas hydrate and therefore have a significant meaning on the recognition and researching of a triggering mechanism of caused geological environmental disasters, and the device and the method have extensive popularization and application prospects.

Description

technical field [0001] The invention relates to an experimental simulation research device and an experimental method for disaster-induced disasters induced by hydrate mining with dense caprock on the seabed, and belongs to the technical field of disaster experiment simulations induced by natural gas hydrate mining. Background technique [0002] Gas hydrate is a cage-type crystalline compound formed by natural gas and water under certain temperature and pressure conditions, and is widely distributed in the outer margins of continents and permafrost zones. It has the characteristics of wide distribution, large resource reserves, and high energy density. Natural gas hydrate is expected to become the most popular energy fuel in the middle of this century. [0003] However, it is generally believed that the development of gas hydrates will also bring a series of negative environmental impacts, such as intensifying the greenhouse effect, triggering geological disasters such as cr...

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Problems solved by technology

During the process of developing natural gas hydrate, the leakage of methane gas into the atmosphere will inevitably aggravate the greenhouse effect and cause the temperature to rise, which will cause the natural gas hydrate under the permafrost to decompose automatically, further aggravating the greenhouse effect; gas and leave water, that is, solid hydrate turns into liquid water, which may lead to changes in the physical, geophysical, and geochemical properties of sediments, causing crustal changes and seafloor slides; the decomposition of gas hydrate in seabed sediments Methane enters the water body and reacts with dissolved oxygen, reducing the concentration of dissolved oxygen in seawater. At the same time, global warming will increase the temperature of the water body, further reducing the concentration of dissolved oxygen, and affecting the survival and evolution of biological populations on land and in the ocean.

[0004] Existing simulation systems for disasters caused by gas hydrate development are limited to the study of hydrate distribution and micro-mechanical properties, or the use of core tubes to simulate the development of individual closed gas hydrate reservoirs, while for the overall formation with tight caprocks There is insufficient research on the deformation of the ocean, the disturbance of seawater, and the change of methane concentration in the atmosphere, and there is a lack of a comprehensive macro-simulation system of the atmosphere-ocean-stratum

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