Method of exploiting natural gas hydrates through cooperation of liquid-state CO2 magnetofluid displacement and microwave heating

Abstract

The invention belongs to the technical field of natural gas hydrate exploitation and relates to a method of exploiting natural gas hydrates through cooperation of liquid-state CO2 magnetofluid displacement and microwave heating. The method comprises the following steps of selecting an appropriate natural gas hydrate reservoir and establishing a wellbore for natural gas hydrate exploitation; ascending a microwave generator to the downhole from the wellbore; filling liquid-state CO2 magnetofluid into the natural gas hydrate reservoir; starting the microwave generator to generate microwaves to heat the natural gas hydrate reservoir to enable liquid-state CO2 and the natural gas hydrates to have a displacement reaction to decompose the natural gas hydrates; outputting natural gas and other fluid through a recovery device and conducting separation to obtain natural gas. According to the method, metal nanoparticles are dispersed into the natural gas hydrate reservoir by filling the liquid-state CO2 magnetofluid, the microwave heating efficiency is enhanced, and the displacement reaction between CO2 and CH4 hydrates is utilized to some extent; and through combined action of heating and CO2 displacement reaction, decomposition and exploitation of the natural gas hydrates are promoted.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation, in particular to a liquid CO 2 A method for synergistic recovery of natural gas hydrate by magnetic fluid displacement and microwave heating. Background technique [0002] Natural gas hydrate is a research hotspot in the current oil and gas industry, and is considered to be an ideal potential alternative energy source in the 21st century. Countries around the world are scrambling to increase investment in the field of natural gas hydrate and carry out related research. Who can take the lead in this field? , Whoever has the initiative in future development, the United States, Japan, Germany, India and other countries have designated gas hydrate development plans. However, the current mining technology cannot meet the requirements of large-scale commercial development. At present, the development of natural gas hydrate is in the stage of trial production worldwide. Canada,...

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Problems solved by technology

However, for natural gas hydrate reservoirs, the burial depth is relatively shallow and they are completely consolidated, so fracturing is difficult to succeed. Even if fracturing is successful, the reservoir structure will be destroyed and the risk of sand production will be aggravated. Therefore, the method in the above patent is not applicable gas hydrate

In addition, the shale content in the gas hydrate reservoir is high, and the water-based metal nanoparticle solution may cause the clay to swell and damage the seepage capacity of the reservoir. absorption, so how to inject magnetic nanoparticles is also a problem

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