Device and method for exploiting terrestrial natural gas hydrates through CO2 fracturing and displacing

Abstract

The invention discloses a device and method for exploiting terrestrial natural gas hydrates through CO2 fracturing and displacing. The device is composed of a CO2 control system, a natural gas hydrate control system and a power generation control system; the power generation control system is connected to the CO2 control system and the natural gas hydrate control system, and the CO2 control system is connected with the natural gas hydrate control system. According to the device and method, by combining CO2 dry fracturing with CO2 displacing, the problems that when the hydrates are exploited only by adopting CO2 displacing, the speed and the efficiency are low are solved, hydrate exploiting and greenhouse gas burying and storing are integrated into a whole, and meanwhile the stability of a hydrate layer in the exploiting process is guaranteed. Information such as the pressure, the temperature and the permeability of the hydrate layer can be collected in real time in the fracturing and exploiting process, the exploiting speed of hydrate decomposition gas and improvement treatment on the reservoir permeability are adjusted and controlled according to the information, and therefore the purpose of efficient and safe exploiting is achieved.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a terrestrial natural gas hydrate CO 2 A device and method for fracturing replacement mining. Background technique [0002] With the depletion of traditional fossil energy sources, it is imminent to find new alternative energy sources. Natural gas hydrate is an ice-like clathrate compound composed of water molecules and hydrocarbon molecules under certain conditions, and is widely distributed in continental permafrost and oceans. It is estimated that the carbon content of natural gas hydrate in the continental slope sediments is equivalent to twice that of fossil energy such as oil, natural gas, and coal, so it is considered to be one of the most promising new energy sources. [0003] Since the 1990s, the exploitation and utilization of natural gas hydrate has gradually become a research hotspot at home and abroad. The traditional hydrate exploitation is mainly divided into thre...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned existing natural gas hydrate mining method that easily destroys the hydrate formation structure, thereby causing formation instability and geological disasters, and using CO 2 In the replacement and exploitation of natural gas hydrate, the replacement reaction efficiency is low and the speed is slow. Conventional hydraulic fracturing has waste of water resources, great damage to the formation, and incomplete flowback that causes groundwater pollution and hinders CO 2 Displacement, fracturing and CO 2 To replace the complex equipment and process of the joint, and provide a terrestrial natural gas hydrate CO 2 Device and method for fracturing replacement mining

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