207results about "Coal gasification" patented technology

The invention relates to a deep coal underground gasification method which comprises the following steps: drilling a plurality of gasification wells in a land parcel, sequentially arranging the plurality of gasification wells into three rows from the edge of the land parcel, and fracturing a bottommost coal seam; the first row of gasification wells are injection wells, the second row of gasification wells are production wells, and the bottommost coal seam between the first row of gasification wells and the second row of gasification wells is gasified; when the gasification high-temperature area of the gasified coal seam is expanded to the front edge of the gas cooling area, the second gas gasification well is closed, the third gas gasification well serves as a production well, and the coal seam continues to be gasified; meanwhile, a fourth row of gasification wells are drilled; after the coal bed is gasified, the bottommost coal bed between the second row of gasification wells and the third row of gasification wells is gasified, and so on, the bottommost coal bed between all the rows of gasification wells is gasified; meanwhile, cement paste is injected into the first exhaust gasification well to fill the gasified goaf; and so on, filling the goaf between each row of gasification wells; sequentially gasifying and refilling each coal seam from bottom to top according to the method.

The invention relates to the technical field of underground coal gasification, in particular to a coal underground gasification process stability monitoring and evaluating method which comprises the following steps: determining a space mapping relation between a gasifier temperature field and an acoustic emission event according to the temperature gradient and the acoustic emission event of a gasifier; carrying out three-dimensional inversion on a combustion cavity of the gasification furnace, and determining attenuation trends of the coal seam under different temperature gradients; according to the attenuation trend of the coal seam under different temperature gradients, the propelling direction of the boundary of the combustion cavity is determined by utilizing the spatial distribution density and the relative position of each acoustic emission event; according to the propelling direction of the fuel cavity boundary, boundary moving paths are formed, and the propelling area proportion of each position in the propelling direction is calculated according to the distance difference of the boundary moving paths; and according to the propulsion area proportion of each position in the propulsion direction and the expansion rate of the combustion cavity, determining the space stability classification of each part of the combustion cavity. The accuracy and the efficiency of monitoring underground gasification of the coal seam are realized.

The invention relates to the technical field of coal underground gasification control, in particular to a stable control method for the gasification process of deep coal passing through dirt band. The gas pressure distribution data and the pore change characteristic data of the deep coal gasification area are collected in real time through the distributed sensor array, the gas dynamic correction permeability is generated, the gas injection pressure is adjusted and dynamically corrected according to the gas dynamic correction permeability, and the gas pressure is kept stable; screening a potential risk area through a main stress direction deviation angle and a stress concentration coefficient in the dirt band layer, analyzing a shear stress threshold value of the potential risk area based on a stress-strain coupling model, and judging a stability evaluation index of the potential risk area; and when the stability evaluation index is lower than a threshold value, a multi-stage emergency regulation and control mechanism is triggered, and a dirt band layer reinforcement intervention scheme is generated. By means of multi-source data fusion and a dynamic feedback mechanism, the limitation of a traditional method for lagging response of the instability risk of the dirt band layer is broken through, and full-closed-loop intelligent stable control over the gasification process is achieved.

The invention discloses a coal seam group occurrence three-area linkage gas extraction method. Firstly, a coal seam is divided into an underground coal gasification area, a pressure relief permeability increasing area and an original extraction area; in the initial stage of underground coal gasification, in the process that high-temperature combustible gas generated by underground coal gasification is injected into a ground drilling well, the high-temperature combustible gas and a coal body are subjected to heat transfer, so that the temperature of the coal body is increased, and gas desorption is enhanced; under the continuous coupling action of high temperature and high pressure of the high-temperature combustible gas, the permeability of the coal body is improved; in the process that high-temperature combustible gas is injected into the ground drilling well, gas extraction is continuously conducted on other adjacent drilling holes; under the condition that gas injection and gas extraction are sequentially and circularly performed in ground drilling, the coal body is circularly impacted by positive pressure-negative pressure alternating aerodynamic force, and further fracturing of the coal body is facilitated; under the triple effects of high-temperature coal body gas desorption strengthening, coal body permeability increasing and gas displacement, large-flow and high-quality extraction of deep coal seam gas is finally achieved.

The invention belongs to the technical field of coal bed gas exploitation, and particularly relates to a method for achieving multiple purposes of a coal bed gas horizontal well. Firstly, a horizontal well is constructed in a coal seam, staged fracturing is conducted to increase permeability, coal bed gas ground extraction is achieved, when the coal bed gas yield cannot reach the economic recoverable condition, coal underground gasification is conducted through the horizontal well, and finally carbon dioxide obtained after gasification separation or other output is injected for storage through underground residual coal and coal cinder gaps. Multiple purposes of the coal bed gas horizontal well are achieved; through one-well multi-stage utilization, the functions of coal bed gas extraction, coal underground gasification, carbon dioxide storage and the like are achieved step by step, and the comprehensive cost is reduced by 40% or above.

The invention relates to the field of clean energy development and utilization, in particular to an underground coal gasification method with high-temperature steam as a gasifying agent and an experimental device. The method comprises the steps of exploration, well building, permeability increasing, gasification, coal gas utilization and waste treatment, the experimental device comprises a steam generator and a gasification furnace, the steam generator injects high-temperature steam into the gasification furnace, the high-temperature steam is used for coal gasification, in the gasification step, the high-temperature steam is injected into a coal seam, and the high-temperature steam is used for coal gasification. The high-temperature steam serving as a gasifying agent is subjected to a series of reactions with the coal, the high-temperature steam is gasified to generate coal gas through chemical reaction with the coal, and the high-temperature steam is also used for heating the coal to pyrolyze the coal to generate coal gas; according to the method, oxygen is not directly injected into the coal seam, the coal seam is not ignited, and combustion of coal is not involved, but high-temperature steam is injected into the coal seam, the underground coal gasification process is completed through the oxidation-reduction reaction and the distillation pyrolysis action of the high-temperature steam and the coal, and the raw gas is generated.

The invention belongs to but not limited to the technical field of underground coal gasification, and discloses an underground coal gasification method and gas injection equipment. Constructing a directional drill hole and a gasification channel penetrating through the underground coal seam; a gas injection pipe with a plasma torch is put into the gasification channel, a gasification agent is injected, and in-situ gasification of the underground coal seam is implemented; and the generated gas is conveyed to the ground for collection through the drill hole. According to the underground coal gasification method and the gas injection equipment provided by the invention, the gasification agent is activated by the plurality of plasma torches arranged in the directional channel at the tail end of the gas injection pipe and then is directionally jetted to the coal seam, so that the gasification agent is in contact with the coal seam in a short time and is gasified, the directional conveying of the plasma gasification agent is realized, and the effective utilization rate of the plasma gasification agent is improved; meanwhile, a combustion space area of the coal seam after gasification can be expanded in a fan shape in the longitudinal direction with the gasification agent outlets of the plasma torches as the center, the expansion equivalent radius of the combustion space area is relatively large, and a large amount of coal can be gasified through one gasification channel.

The invention discloses a coal underground gasification injection-production well pattern determination method, device and equipment and a medium. The method comprises the steps that an injection well site is determined according to a gasification control area of a target reservoir development body, and an injection well bore structure is determined according to injection conditions and coal seam parameters corresponding to the gasification control area; determining a migration path concentration area and an enrichment area of preset generated gas, and determining a production well site according to the migration path concentration area and the enrichment area of the preset generated gas; and according to the injection well site, the injection well body structure and the production well site, coal underground gasification injection-production well pattern distribution of the target reservoir development body is determined. According to the technical scheme, by selecting the proper injection well site, the injection well body structure and the production well site, coal underground gasification injection-production well pattern distribution is determined, coal underground gasification injection-production well pattern deployment is achieved, and the coal seam combustion rate and the preset generated gas recovery rate are increased.

The invention belongs to the technical field of strip mine residual coal resource recovery, and particularly relates to a strip mine end slope residual coal underground gasification re-mining process and system.The strip mine end slope residual coal underground gasification re-mining process comprises the following construction steps that S1, a directional drilling system is constructed at a strip mine end slope coal seam outcrop and comprises a gas injection drilling hole, an exhaust drilling hole and a drainage drilling hole, forming a gasifier type I suitable for a thick coal seam or a gasifier type II suitable for a thin-medium thick coal seam; s2, injecting a gasification agent into the gasification furnace to perform coal bed gasification to generate coal gas and capture CO2 in gasified tail gas; s3, pressurizing and liquefying the captured CO2, injecting the liquefied CO2 into a combustion space area, and performing mineralization and storage in combination with alkaline ash; wherein the gas injection drill hole and the exhaust drill hole are arranged at the bottom or the top of a coal seam according to the thickness difference of the coal seam, and part of accumulated water is reserved in the whole drainage drill hole to prevent gas leakage. Therefore, efficient recovery of residual coal and full-process low-carbon emission are realized through differential gasification furnace structural design, dynamic sealing of the drainage drill hole and collaborative filling technology of the combustion space area.

According to the coal in-situ fluidized mining method based on the radio frequency heating technology, after coal seam parameters are determined through geological exploration, an L-shaped heating well is arranged in the middle of a coal seam, an L-shaped production well is arranged on the top of the coal seam, and a high-permeability fracture network is constructed by adopting a liquid CO2 high-pressure fracturing technology. And then deploying a radio frequency heating device in the heating well, and promoting in-situ pyrolysis and gasification of the coal seam to generate raw gas such as CH4 and CO by accurately regulating and controlling power and frequency. According to the coal in-situ fluidization mining method, through the synergistic effect of'fracturing-supporting-radio frequency excitation ', continuous conversion of coal solid-state energy to flow-state energy and direct extraction of gas-state products by the production well are achieved, the functions of efficient mining and CO2 geological storage are achieved, environmental damage and safety risks generated by traditional mining are remarkably reduced, and the coal in-situ fluidization mining method is suitable for industrial production. And an innovative path is provided for green development of coal resources.

A method for fracturing a subsurface rock formation for hydrogen production includes injecting a fluid comprising water into a subsurface rock formation under controlled conditions, generating fractures in the subsurface rock, and recovering hydrogen gas produced by subsurface rock after the generation of the fractures. The fluid is injected at a pressure below the breakdown pressure of the subsurface rock.

An in-situ large-area drilling and furnace construction method for coal gasification and co-mining of kerosene and / or coalbed methane is provided, which includes: constructing an injection well to the target coal seam and then constructing a horizontal well to divide the target coal seam into sections of coal; extracting coalbed methane; transforming the horizontal wells on both sides of the coal in the first section of coal into coal gasification production wells, and dividing them into intake and exhaust channels; constructing ventilation boreholes to form a “honeycomb shaped” gasifier, which ignites and gasifies to promote the production of combined gases from combustion; after the combustion of first section of coal is completed, continuing to construct the next section of coal and drill holes between adjacent horizontal wells to achieve continuous coal seam combustion and gasification. The method of the present disclosure can improve combustion efficiency and increase kerosene extraction efficiency.

A method of generating biogas is disclosed, including delivering a feedstock downhole to a coal reservoir, generating biogas within the coal reservoir, and harvesting the biogas. The method comprises delivering a feedstock downhole to a coal reservoir via an injection well, generating biogas within the coal reservoir through microbial action, creating a biogas that is isotopically differentiable from a background gas that is native to the coal reservoir, harvesting the biogas at the injection well and one or more offset wells of the coal reservoir, analyzing the biogas and coal bed methane from the coal reservoir at the injection well and at one or more offset wells within the same coal reservoir, detecting the biogas at the offset wells using isotopic differentiation, and mapping the migration of the biogas from the injection well to the offset wells using the biogas as an isotopic tracer.

A method for passively producing hydrogen from a geological formation includes drilling a plurality of lateral wellbores into an iron-rich geological formation from a mother wellbore extending from a surface location. Each of the plurality of lateral wellbores has an inclination along its length of less than 90 degrees. A biocide configured to inactivate hydrogen-consuming microbes is placed into the plurality of lateral wellbores and thereby into formation water that is flowed from the geological formation into the plurality of wellbores. Hydrogen gas effervesced from the formation water in the plurality of lateral wellbores is collected via the mother wellbore. The hydrogen gas is generated at least in part from a water reduction reaction of minerals of the geological formation with the formation water and risen through the plurality of lateral wellbores passively by buoyancy effects without pumping.

The application discloses a coal drilling type coal underground gasification furnace, a gasification furnace construction method and a coal seam gasification method. A gas outlet well is connected with a gas injection well through a horizontal section at the top of a coal seam to form a U-shaped gasification furnace structure. The coal seam is excavated at the joint of the gas injection well, so that the coal seam collapses, stress is redistributed, the cavity is enlarged, the coal seam below the pocket section of the gas injection well is ignited, the coal seam is positively advanced, and the effective synthesis gas is discharged to the ground through the gas outlet well. The application can well develop and utilize tectonic coal, and has the advantages of environmental protection, safety and good economic benefits.

The present invention discloses a device and method for monitoring and controlling multi-directional heat flow of retreat-type underground gasification, the device comprising a coiled pipe and two heat flow meters; a circular foil is provided at the center of the front end of the heat flow meter, a heat sink is provided inside the heat flow meter, a cooling water channel is opened in the middle of the heat sink, the heat sink and the protective shell body of the heat flow meter are thermally insulated, two copper wires connected to a signal processor and a temperature measuring thermocouple connected to the circular foil are provided in the heat flow meter, the other ends of the two copper wires are respectively connected to the heat sink and the circular foil; the present invention integrates a heat flow meter suitable for continuous measurement in a high-temperature environment on the coiled pipe, can collect the axial and radial heat flux density and temperature of the coiled pipe at the underground gasification injection point in real time, grasp the expansion of the combustion zone, comprehensively judge the coal seam combustion state in combination with the gas composition of the gas gathering well, and guide the retreat of the gas injection point.

The present invention belongs to, but is not limited to, the technical field of underground coal gasification, and discloses an underground coal gasification method and gas injection equipment; constructs a directional borehole and a gasification channel that penetrates an underground coal seam; lowers a gas injection pipe carrying a plasma torch into the gasification channel and injects a gasifying agent to implement in-situ gasification of the underground coal seam; and the generated coal gas is transported to the surface through the borehole for collection. The underground coal gasification method and gas injection equipment proposed by the present invention activate the gasifying agent through multiple plasma torches built into the directional channel at the end of the gas injection pipe and then directionally injects it into the coal seam. The gasifying agent contacts and gasifies the coal seam in a relatively short period of time, thereby achieving directional transportation of the plasma gasifying agent and improving the effective utilization rate of the plasma gasifying agent, thereby increasing the effective component content of the coal gas. At the same time, the combustion zone of the coal seam after gasification will expand in a fan-shaped manner longitudinally with the gasifying agent outlet of each plasma torch as the center. The expansion equivalent radius of the combustion zone is relatively large, and a single gasification channel can gasify a large amount of coal.

The invention discloses coal underground gasification simulation experiment equipment and method.The equipment comprises a screening mechanism, the screening mechanism comprises a screening shell and screening assemblies, a plurality of sliding grooves are obliquely formed in the screening shell in the vertical direction, and the screening assemblies are slidably arranged in the sliding grooves; a feeding port is formed in the top of the screening shell, a first material guiding plate is obliquely and fixedly arranged at the feeding port, a plurality of material conveying plates are obliquely and fixedly arranged in the screening shell in the vertical direction, the screening assembly comprises two arc-shaped screening bases, a first screening net, a second screening net and a material pushing assembly, and the screening bases are arranged in the screening shell. Supporting plates are fixedly arranged on the screening bases in an inclined mode, a first screening net is fixedly arranged between the two supporting plates, an arc-shaped second screening net and an arc-shaped check ring are fixedly arranged between the two screening bases, two openings are formed between the arc-shaped check ring and the second screening net, and the material pushing assembly is rotationally arranged on the screening bases.

The present invention discloses a combustible casing for an underground coal gasification channel and a preparation method thereof, belonging to the technical field of petroleum industry pipe manufacturing. The preparation process of the combustible casing is simple. The combustible casing is composed of 0.2-1.0Zr, 1.0-5.0Zn, 1.0-5.0Al, 7.0-13.0Gd, 3.0-6.0Y, 3.0-6.0Nd, and the remainder being Mg and impurities in mass percentage. After being cast and turned into an ingot, the ingot is solution treated and extruded, and then subjected to aging treatment. Finally, the combustible casing is prepared, which has sufficient space for normal operation and has the characteristic of being burned and consumed above a specific temperature. The casing has a rationally designed alloy element composition, low density, high specific strength, excellent room temperature and high temperature strength, and the characteristics of being burned and consumed above the specific temperature.

Injecting CO2 that is diluted within water, into a coal seam, which allows for the sequestering and control of downhole CO2 within connected fractures without damaging the subterranean formation.

The invention relates to the technical field of underground coal gasification gas purification, in particular to an efficient gas filtering device for an underground coal gasification curve type production well, which comprises a conveying channel, a gas inlet channel, a gas outlet channel and a gas outlet channel, the first bend is used for connecting the inlet channel and the connecting channel, and a plurality of first spiral ribs which are spirally arranged are arranged in the first bend; the second bend is used for connecting the connecting channel and the discharging channel, and a plurality of second spiral ribs which are spirally arranged are arranged in the second bend; according to the fine filtration unit, the separation efficiency can be improved by utilizing the characteristics of a curve flow field, large impurities are subjected to pre-separation treatment through centrifugal force generated by airflow steering, the service cycle and the service life of the fine filtration unit can be prolonged, the cleaning frequency can be reduced, and the blocking cycle can be prolonged.

The invention discloses a coal underground gasification strengthening method which comprises the following steps: step 1, drilling a U-shaped well of which the horizontal section is positioned in a coal seam at a target coal seam, respectively arranging an injection well and a production well at two ends of the U-shaped well, and putting a multi-channel continuous pipe into the horizontal section through the injection well; 2, oxygen, fuel and an ignition agent are injected into the horizontal section through the multi-channel continuous pipe to ignite the coal seam, then oxygen and a gasification agent are continuously injected through the multi-channel continuous pipe to enable the coal seam to be gasified to generate raw gas, and a gasification cavity is formed in the coal seam in the gasification process; 3, fuel and oxygen are injected into the newly-formed gasification cavity through the multi-channel continuous pipe, combustible gas cloud is formed at an outlet by the fuel and the oxygen, then the combustible gas cloud is ignited through an ignition agent sprayed out of the multi-channel continuous pipe for deflagration, and raw gas is produced; step 4; repeating the step 3 until the gasification of the cavity body of the gasification cavity is completed; and 5, the multi-channel continuous pipe is dragged to retreat, the steps 2-4 are repeated till gasification transformation of the whole coal seam is completed, and the gasification efficiency is high.

The invention discloses a simulation device for oil-rich coal in-situ negative pressure pyrolysis and oil gas collection, and aims to solve the problem that multi-condition synergistic effect is not considered in oil-rich coal pyrolysis in an existing laboratory. The system comprises a pyrolysis system, an environment and pressure supply system, a condensed oil gas extraction system, a gas extraction system and a tar quality analysis system, the pyrolysis system comprises a pyrolysis cabin, a heating system is arranged in the pyrolysis cabin, the environment and pressure supply system comprises an atmosphere environment supply system and an in-situ pressure supply system, the condensed oil gas extraction system comprises an oil gas collection assembly, the gas extraction system comprises a gas analyzer and a negative pressure extraction assembly, and the tar quality analysis system comprises a rotary evaporator. The heating system, the atmosphere environment supply system, the in-situ pressure supply system, the oil gas collection assembly, the gas analyzer and the rotary evaporator are all connected with the control terminal. The simulation of the pyrolysis process of the oil-rich coal under the multi-condition synergistic effect is realized by constructing multi-condition coupling oil-rich coal pyrolysis characteristic monitoring.

A process includes identifying a hydrocarbon-bearing reservoir containing a hydrocarbon fluid and a brine having a sufficient salinity level to prevent or inhibit one or more of methanogenesis and sulphate-reduction activity, and responsive to a concentration of hydrogen being below 1000 parts per million in a sample collected from the hydrocarbon-bearing reservoir, introducing at least one non-native or indigenous hydrogen producing microorganism or stimulating the activity of at least one indigenous bacteria capable of stimulating a microbial consortium to increase a production rate of hydrogen in the hydrocarbon-bearing reservoir.

The invention relates to the technical field of coal underground gasification, and discloses a radioactive isotope-based coal underground gasification combustion space shape measurement method, which specifically comprises the following steps of: selecting and injecting radioactive isotopes: selecting the radioactive isotopes with moderate half-life period and injecting the radioactive isotopes into a combustion space; radiation detectors are arranged and data are collected, wherein the detectors are arranged on the basis of the periphery of a combustion space area where radioactive isotopes are injected, and radiation intensity data are collected; data processing: performing background radiation deduction based on the acquired radiation intensity data, and selecting a proper threshold value for a calculation result by adopting a maximum entropy threshold value method; outputting a result, dividing the boundary of the combustion air area based on the calculated model parameter m and the determined threshold value, and outputting a three-dimensional contour surface diagram and contour surface diagrams in all directions of the combustion air area; the measurement method provided by the invention is high in industrial practicability, high in measurement precision and relatively simple and convenient to operate, and provides important technical support for large-scale application of a coal underground gasification technology.

The invention provides a spontaneous heating composite synergist as well as a preparation method and application thereof. The spontaneous heating composite synergist is prepared from the following components in parts by weight: 20 to 40 parts of a component A, 20 to 40 parts of a component B and 30 to 40 parts of a component C, wherein the component A comprises an alkali metal salt inner core and a first silane coupling agent and aluminate coupling agent composite shell layer which coats the outer surface of the alkali metal salt inner core through chemical bonds; the component B comprises an alkaline earth metal oxide core and a second silane coupling agent shell layer which coats the outer surface of the alkaline earth metal oxide core through a chemical bond; and the component C comprises an active metal core and a third silane coupling agent shell layer coated on the outer surface of the active metal core through a chemical bond. The self-heating composite synergist is subsequently applied to in-situ gasification, in-situ dry distillation, superheated steam gasification and supercritical water gasification of deep coal and has a relatively good heat-increasing synergistic effect.

The utility model relates to a combustion head assembly and a coiled tubing, the combustion head assembly comprises a combustion head, the combustion head is provided with a combustion-supporting channel used for conveying combustion-supporting gas, the combustion head is provided with an oxygen channel used for conveying oxygen, and the combustion head is provided with an electric ignition device; the protective cover comprises a cover body, the cover body is arranged at the end, provided with the electric ignition device, of the combustion head, the cover body is provided with a containing space used for containing the electric ignition device, and the cover body is provided with a first hole communicated with the containing space. The protective cover can prevent the electric ignition device of the combustion head from being damaged by the impact force of the sleeve, the first hole is formed in the cover body, it can be ensured that combustion-supporting gas is released to an underground gasification reaction area through the first hole, meanwhile, the gas can be prevented from being ignited in a sealed environment to cause explosion, and the safety of the combustion process is improved.

The present invention discloses a drilling-type coal seam in-situ gasification mining method, which belongs to the technical field of coal in-situ gasification and coalbed methane mining. Two vertical boreholes are constructed from the ground through the rock layer to the coal seam, and then horizontal boreholes are constructed at the bottom of the two vertical boreholes to communicate with each other. A combustion system is set in one borehole, and an extraction system is arranged in the other borehole; the combustion system includes a combustion pipe with multiple flame nozzles at the end. After the combustion pipe enters the end of the horizontal borehole, it is ignited and sprays fire into the coal seam, and the extraction system is started for extraction. At the same time, the combustion pipe moves along the horizontal borehole while burning until it reaches the other end of the horizontal borehole. The combustion pipe rotates slowly horizontally with the entrance end of the horizontal borehole as the center of the circle while continuously telescoping back and forth, forming a gasification goaf that is fan-shaped when viewed from the horizontal plane, and mining is stopped until the gasification goaf is close to forming a circle. Coal mining is directly changed to gas and water gas mining, achieving unmanned underground mining, reducing mining costs, and reducing waste ground emissions.

The application discloses a V-shaped tunnel underground in-situ gasification coupled power generation system, and relates to the technical field of coal underground gasification, in-situ combustion and clean energy power generation. The system is composed of an oxygen-enriched air separation unit, a vertical injection unit, a capillary pore network and a V-shaped tunnel gasification power generation unit, adopts a V-shaped shield tunnel with a concrete tile and an S32001 stainless steel composite lining to build an underground gasification area; high-pressure water and oxygen-enriched air are deeply injected into the capillary pores at a spacing of 50-200 meters through a branch pipe for multi-point injection, and synthesis gas is generated by underground high-temperature self-gasification; the synthesis gas drives a steam turbine to generate power, the gasification waste heat is recycled to increase efficiency, and slag is pumped under negative pressure to prevent blockage. The application realizes the integration of underground gasification and power generation, is stable and efficient, does not need large ground equipment, has a high coal utilization rate, is suitable for large-scale clean power generation of low-rank coal, and has industrial popularization value.

The present invention discloses a method for underground coal combustion gasification and carbon dioxide sequestration exploitation and treatment, and the method includes: S1. Injection pressure fracturing: Injecting fracturing gas through the gas outlet well to form a fracture network in the corresponding coal seam in the gasification area to be exploited; S2. Combustion gasification: Taking the bottom end of the intake well of the furnace to the bottom end of the mountain gas well as the exploitation direction and discharging the synthesis gas through the gas outlet well of the furnace; S3. Sealing and closing the well: Injecting carbon dioxide as the displacement gas into the space to be sealed through the intake well and collecting the mixed gas through the gas outlet well, and then injecting high-pressure CO2 gas into the space to be sealed for sequestration treatment. In the present invention, horizontal fracturing injection channels are used for injection pressure fracturing treatment of the gasification area to be exploited in the upper furnace in the injection pressure fracturing of a single furnace to form a fracture network. The present invention can realize the differential node follow-up of the upper and lower furnace wells together and according to the process flow with a difference of one process node, reduce the sealing difficulty of the well and the combustion void area, and improve the exploitation efficiency.