Fluidized mining method of combustible ice through rotary jet grouting and pressure relieving

Abstract

The invention relates to a fluidized mining method of combustible ice through rotary jet grouting and pressure relieving. The situations of pressure change and the like in a reservoir stratum can be grasped timely while pressure-relief mining is conducted on combustible ice resources, corresponding improving treatment is provided, and relative information of the reservoir stratum can be timely collected, fed back and processed while the mining speed and the like can be effectively controlled; and meanwhile the fluidized mining method of the combustible ice through rotary jet grouting and pressure relieving is low in mining cost, easy to achieve, high in economical efficiency, simple in mining technology and mature in related application equipment technology, and can rapidly achieve industrial mining application.

Description

technical field [0001] The invention relates to a combustible ice rotary spraying pressure relief fluidized mining method, which is suitable for mining solid combustible ice in permafrost layers. Background technique [0002] Combustible ice is a high-density, high-calorific value, clean energy source. According to scientists' estimates, the total global resources of combustible ice converted into methane gas is about twice the total known energy reserves of coal, oil and natural gas in the world; With the depletion of oil and gas resources in the world, it is imminent to seek new alternative energy sources with huge reserves. According to relevant data analysis, the continental slope of the South my country Sea, the southern waters of Taiwan Island, the Okinawa Trough and the permafrost on the Qinghai-Tibet Plateau all have the conditions for the formation of combustible ice. Therefore, it is of great significance to carry out and strengthen the research on combustible ice...

AI Technical Summary

Problems solved by technology

High energy consumption cannot effectively solve the defect of low heat utilization efficiency; 2. The depressurization method, which reduces the pressure to promote the decomposition of hydrates. This method does not require continuous excitation, and the cost is low. It is suitable for large-scale mining and is currently the most promising method A development technology; 3. Chemical reagent injection mining method, the chemical reagent injection mining method injects certain chemical reagents into the combustible ice reservoir, such as brine, methanol, ethanol, ethylene glycol, glycerol, etc., to destroy combustible ice The phase equilibrium condition of the reservoir promotes the decomposition of combustible ice. Although this method can reduce the initial energy input, its defects are obvious. The chemical reagents it requires are expensive and have a slow effect on the combustible ice reservoir; 4. Replacement mining method , the basis is still the pressure condition in the stable zone of combustible ice. Under certain temperature conditions, the pressure required for combustible ice to maintain stability 2 The hydrate is higher, and the heat released by this action can make the decomposition reaction of combustible ice continue, but there is a big hidden danger. If the geological movement releases a large amount of CO2, it will bring harm to the ecological environment. disastrous consequences

[0004] So far, an economical and effective large-scale commercial mining method for combustible ice has not been formed, and it is difficult to achieve real commercial mining purposes by simply using one mining method in the known methods. Therefore, new mining methods are urgently needed to Accelerate the large-scale commercial mining of combustible ice

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