Method for crack communication, channel processing and underground gasification of underground mineral contained organic carbon reservoir

Abstract

The invention relates to a method for crack communication, channel processing and underground gasification of an underground mineral contained organic carbon reservoir. According to the method, a mixture of CO2 and O2 serves as a medium of a crack communication step, a channel processing step and / or a gasification step during underground gasification. By means of the mixture of CO2 and O2, energy in the underground mineral contained organic carbon reservoir is developed and utilized. Compared with the traditional utilization pattern, such as underground mining, the energy utilization rate is greatly increased. Compared with the traditional underground gasification technology, a heat value of combustible gas is increased, effective gas composition is improved and regulated, generation of CO2 is inhibited, production cost of raw materials is reduced, and trapping and resource utilization of CO2 is achieved.

Description

technical field [0001] The invention relates to a novel underground gasification process. More specifically, the present invention relates to the fracture communication, channel processing and underground gasification process of carbon-containing organic mineral reservoirs, especially coal seams and oil shale. Background technique [0002] Underground coal gasification technology is an in-situ coal gasification technology that directly converts underground coal seams into coal gas. During the underground gasification process, gasification agents (such as air, oxygen, water vapor, etc.) are injected into underground coal seams through ground boreholes. , so that the coal seam and the gasification agent can be directly gasified (the main reaction is C+CO 2 →2CO, C+H 2 O→CO+H 2 etc.) to generate gas (main components CO, H 2 、CH 4 , CO 2 etc.), and the gas generated by the reaction is collected to the ground through drilling holes, and used as industrial fuel for direct co...

AI Technical Summary

Problems solved by technology

[0004] (1) The gas still contains a relatively high proportion of N 2 (40-60%), which increases the power consumption of the subsequent section of compression transportation, and for N 2 In the synthesis section with higher content requirements, the denitrification section must be set up, but the N in the gas 2 It is difficult to remove N from gas, considering equipment investment, operation, maintenance and operating costs, etc. 2 not economical enough

[0005] (2) In order to control the N in the gas 2 The gasification agent used in some processes is pure oxygen and water vapor is added. However, during the transportation of water vapor, due to heat exchange with the borehole wall, part of the water vapor will condense into water, which weakens the temperature adjustment effect of water vapor. As a result, the local temperature of the gasifier is too high, the ash melting hinders the gasification reaction, and a large amount of heat is consumed in the process of steam generation, and the energy utilization rate will be reduced

[0006] (3) Underground coal seams generally contain water, so that the outlet gas contains a certain amount of steam, and adding water vapor as a gasification agent will increase the effective gas output load, increase the amount of surface sewage treatment, and because the gas stays longer in the underground gasifier long, will lead to water gas shift reaction (CO+H 2 O→CO 2 +H 2 ) intensifies, which reduces the CO content in the export gas

[0007] (4) As an intermediate and product of the gasification process, CO 2 Participating in a series of oxidation-reduction reactions, it is an important component in the export gas, with a content of about 15-60%. It is an important factor to increase the calorific value and effective components of the gas, but the existing processes usually do not consider CO 2 recycling and utilization

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