CN217330285U - Power coal underground in-situ L-shaped gas supply combustion, L-shaped heat production and carbon sequestration system - Google Patents

Power coal underground in-situ L-shaped gas supply combustion, L-shaped heat production and carbon sequestration system Download PDF

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Publication number
CN217330285U
CN217330285U CN202220953129.4U CN202220953129U CN217330285U CN 217330285 U CN217330285 U CN 217330285U CN 202220953129 U CN202220953129 U CN 202220953129U CN 217330285 U CN217330285 U CN 217330285U
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combustion
well
pipe
heat exchange
heat
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李玉喜
杨靖
王红
周中成
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Chongqing 136 Geological Team
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The utility model discloses a burning of power coal underground normal position L type air feed, L type is adopted heat and carbon and is sealed up system of depositing, each vertical well and horizontal well, wholly be "L" type, heat exchange circulating fluid pipe, combustion-supporting air supply pipe is "L" type and lays along vertical well and horizontal well, the horizontal well is located to implement in situ combustion coal bed and leans on bottom position department, heat exchange circulating fluid pipe is followed the horizontal well through vertical well and is laid the back and is followed the vertical well and connect out, electric ignition installs the front end at combustion-supporting air supply pipe, the horizontal segment of combustion-supporting air supply pipe adopts the screen pipe structure and adopts high temperature self-melting material hole sealing, combustion-supporting air supply pipe, be provided with the hole sealing structure between the wall of a well of heat exchange circulating fluid pipe and vertical well, install pressure sensor in the well, heat exchange circulating fluid pipe links to each other with ground heat exchanger and is used for electricity generation or heat supply; the coal bed underground in-situ controllable continuous combustion can be realized, the combustion heat can be fully extracted and utilized, and after the combustion is finished, the carbon can be subjected to underground in-situ sealing.

Description

Power coal underground in-situ L-shaped gas supply combustion, L-shaped heat production and carbon sequestration system
Technical Field
The utility model relates to a heat utilization and environmental protection technical field of coal exploitation.
Background
At present, power coal is mainly mined to the ground surface through coal mining operation, washed and then transported to power and heat supply factories such as thermal power plants, heat supply plants and the like, and the power coal generates heat and electricity through combustion to provide energy for power and heat demanders. China has promised that carbon dioxide emissions peaked in 2030; before 2060 years, the discharged carbon dioxide is completely offset by means of afforestation, energy conservation, emission reduction and the like. According to the estimation of related research institutions at home and abroad, the energy industry in China is the main industry of carbon emission, and CO emitted in the process of coal combustion utilization 2 Is the main body of carbon emission in the energy industry of China, and accounts for more than 55 percent of the carbon emission of China. The main utilization direction of the power coal is to generate heat energy by combustion, the heat energy is mainly used for power generation, and CO is discharged by coal 2 The main body of (1). In order to achieve the goals of carbon peak reaching in 2030 and carbon neutralization in 2060, the combustion and heat utilization technology of the power coal from low emission to zero emission needs to be developed, and the problem of carbon emission in the combustion and utilization process of the power coal is fundamentally solved.
The underground coal combustion technology has been developed for decades, and in the last decade, the underground coal combustion is mainly used for underground coal gasification to obtain substance products such as coal gas and the like. The underground coal gasification generates a large amount of heat energy, but the heat energy generated by the gasification is not well utilized due to the fact that the underground coal gasification is not a focus of attention, so that great heat energy waste is caused, and in addition, the problem of carbon emission still exists in the process of reburning the obtained coal gas.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a controllable burning that lasts of coal seam underground normal position can fully extract and utilize the heat of combustion to carry out the system that underground normal position was sealed up and is deposited with carbon.
Therefore, the utility model discloses the technical scheme who adopts does: a power coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system comprises a vertical well, a horizontal well, a combustion-supporting gas supply pipe, a heat exchange circulating liquid pipe and an electric ignition device, the horizontal well is positioned at the position close to the bottom in the coal seam for implementing in-situ combustion, the horizontal well is communicated with the vertical well, the combustion-supporting gas supply pipe is paved along the horizontal well after passing through the vertical well, the heat exchange circulating liquid pipe is paved along the horizontal well after passing through the vertical well and then is connected out from the vertical well, the electric ignition device is arranged at the front end of the combustion-supporting air supply pipe, the front end of the combustion-supporting air supply pipe is provided with an air outlet which is opposite to the electric ignition device, the horizontal section of the combustion-supporting air supply pipe adopts a sieve pipe structure and adopts a high-temperature self-melting material to seal holes, a hole sealing structure is arranged among the combustion-supporting air supply pipe, the heat exchange circulating liquid pipe and the wall of the vertical well, a pressure sensor is arranged in the vertical well, and the heat exchange circulating liquid pipe is connected with a ground heat exchanger and used for generating electricity or supplying heat; the vertical well and the horizontal well are respectively provided, one end of the horizontal well is communicated with the lower end of the vertical well, the whole body is L-shaped, and the heat exchange circulating liquid pipe and the combustion-supporting gas supply pipe are L-shaped and are laid along the vertical well and the horizontal well; the heat exchange circulating liquid pipe is of a double-layer sleeve structure, the front end of the outer sleeve is closed, and the front end of the inner sleeve is open and communicated with the outer sleeve; the combustion-supporting air supply pipe is arranged outside the heat exchange circulating liquid pipe in parallel or sleeved outside the heat exchange circulating liquid pipe.
Preferably, the horizontal well adopts a structural form of a plurality of horizontal wells, and one end of each horizontal well is communicated with the lower end of the vertical well; correspondingly, the horizontal sections of the heat exchange circulating liquid pipe and the combustion-supporting air supply pipe adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well.
Preferably, a concrete hole sealing structure is adopted between the combustion-supporting air supply pipe, the heat exchange circulating liquid pipe and the wall of the vertical well.
Further preferably, the pressure sensor is mounted on an inner wall of the combustion-supporting gas supply pipe close to the wellhead.
More preferably, the sieve tube structure is sealed by adopting a high-temperature material resistant to 500-700 ℃.
More preferably, the pipe diameter of the screen structure is not less than 65 mm.
In order to realize underground in-situ controllable combustion, heat exchange heat recovery and automatic carbon sequestration of power coal, three problems need to be solved: (1) the coal bed underground in-situ controllable continuous combustion comprises controllable combustion range and sustainable combustion; the coal seam at the deep part of the underground is in an anoxic state, the continuous and stable combustion of the coal seam is maintained, combustion-supporting gas (such as oxygen) needs to be supplied uninterruptedly, and the supply position of the combustion-supporting gas is limited and the combustion spreading direction is guided through the structural form that the sieve tube is automatically opened at high temperature, so that the controllable combustion range and the sustainability of the combustion can be ensured; (2) the coal bed combustion is controlled within the range of the heat recovery device, so that the full recovery and utilization of combustion heat are ensured, the combustion-supporting gas supply pipe and the heat exchange circulating liquid pipe are arranged in a matched manner, and meanwhile, the waste heat is facilitated to continue heat recovery after combustion and flameout, so that the controllable combustion of the coal bed and the full and maximized utilization of the combustion heat can be realized; (3) during specific construction, a coal bed distribution area favorable for carbon sealing is required to be selected, a wellhead pipeline is sealed after combustion is finished, and underground in-situ sealing is carried out on carbon by combining a combustion cavity, a hole sealing structure of a well wall and peripheral rock strata, so that CO generated by underground in-situ combustion of the coal bed is ensured 2 、SO 2 NOx and waste residues can be directly sealed.
The utility model has the advantages that: the screen pipe structure adopting high-temperature self-melting material hole sealing of the underground in-situ combustion and combustion-supporting gas supply pipe of coal is adopted, and a heat exchange circulating liquid pipe is preset in a combustion area for heat collection, so that complete combustion is ensured not to be extinguished, and combustion flame is guided to flow along with combustion-supportingThe horizontal section of the gas supply pipe spreads to the root, and the collected heat is used for the requirements of power generation equipment, heat supply equipment and the like; implementing underground in-situ controllable combustion of power coal to produce heat, heat exchange to produce heat, heat power generation or heat supply utilization, and simultaneously using CO produced by combustion 2 、SO 2 Gases such as NOx are firstly sealed in a combustion space area, and are gradually absorbed, solidified and permanently sealed by saline water in surrounding strata and strata, so that zero emission to extremely low emission utilization of power coal is realized, and the strategic target of greatly reducing carbon emission while the utilization amount of coal meets the integral requirement of national energy is achieved.
Drawings
Fig. 1 is a schematic view of a first structural form of the present invention.
Fig. 2 is a schematic view of a second structural form of the present invention.
Fig. 3 is a schematic view of a third structural form of the present invention.
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
referring to fig. 1-3, the system for power coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sealing mainly comprises a vertical well 1, a horizontal well 2, a combustion-supporting gas supply pipe 3, a heat exchange circulating liquid pipe 4, an electric ignition device (not shown in the figure), a ground heat exchanger 7, a pressure sensor (not shown in the figure) and a hole sealing structure.
The horizontal well 2 is positioned at the position close to the bottom in the coal seam 6 for implementing in-situ combustion, and the horizontal well 2 is communicated with the vertical well 1. The combustion-supporting gas supply pipe 3 is laid along the horizontal well 2 after passing through the vertical well 1, and the heat exchange circulating liquid pipe 4 is laid along the horizontal well 2 through the vertical well 1 and then is connected out of the vertical well 1. The horizontal pipe section is to be deployed at the bottom of a target coal seam, and the extension length in the coal seam is generally more than 1000m-1500m, so that deformation in the combustion process is prevented.
The electric ignition device is arranged at the front end of the combustion-supporting air supply pipe 3, and the front end of the combustion-supporting air supply pipe 3 is provided with an air outlet which is right opposite to the electric ignition device, so that air can be supplied just during ignition. The horizontal section of the combustion-supporting gas supply pipe 3 adopts a sieve pipe structure 3a, namely a plurality of sieve holes are arranged on the horizontal section at intervals from front to back; and sealing holes by adopting a high-temperature self-melting material, preferably a high-temperature material resistant to 500-700 ℃. When the temperature exceeds the melting temperature, the plugging material melts, the sieve pores open to supply air to the combustion area and the nearby area, and the combustion range and the combustion expansion direction are controlled. The screen diameter is preferably not less than 65 mm.
And a hole sealing structure is arranged between the combustion-supporting air supply pipe 3, the heat exchange circulating liquid pipe 4 and the wall of the vertical well 1 and is used for sealing the hole at the position of the well mouth. Preferably, the combustion-supporting gas supply pipe 3, the heat exchange circulating liquid pipe 4 and the wall of the vertical well 1 are sealed by high-strength cement mortar, so that the high-pressure gas in the combustion control area can be borne. A pressure sensor is arranged in the well, preferably, the pressure sensor is arranged on the inner wall of the combustion-supporting gas supply pipe 3 close to the well head, the pressure sensor is used for detecting the pressure in the well, the pressure in the well is equivalent to the pressure in the combustion-supporting gas supply pipe 3, and the combustion-supporting gas can be injected into a combustion area only by ensuring that the gas injection pressure is larger than the pressure in the well. The heat exchange circulating liquid pipe 4 is connected with a ground heat exchanger 7 for power generation or heat supply. The ground heat exchanger 7 is mounted on the ground 5.
One of the specific structural forms is as follows: as shown in figure 1, a vertical well 1 and a horizontal well 2 are respectively arranged, one end of the horizontal well 2 is communicated with the lower end of the vertical well 1, and the whole body is L-shaped. Accordingly, the heat exchange circulation fluid pipe 4 and the combustion air supply pipe 3 are L-shaped and are laid along the vertical well 1 and the horizontal well 2. The heat exchange circulating liquid pipe 4 adopts a double-layer sleeve structure, the front end of an outer sleeve 4a is closed, and the front end of an inner sleeve 4b is opened and communicated with the outer sleeve 4 a. The suit of combustion-supporting air supply pipe 3 forms three-layer sleeve pipe structure outside heat exchange circulation liquid pipe 4, does in proper order: an inner sleeve 4b, an outer sleeve 4a and a combustion-supporting gas supply pipe 3.
The second specific structural form is as follows: as shown in fig. 2, it is basically the same as one of the structural forms except that: the combustion-supporting air supply pipe 3 is arranged outside the heat exchange circulating liquid pipe 4 in parallel and comprises a horizontal section and a vertical section.
The third concrete structural style: as shown in fig. 3, it is basically the same as one of the structural forms except that: the horizontal well 2 adopts a structural form of a plurality of horizontal wells, and one end of each horizontal well 2 is communicated with the lower end of the vertical well 1; accordingly, the horizontal sections of the heat exchange circulation liquid pipe 4 and the combustion-supporting gas supply pipe 3 adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well. The combustion-supporting air supply pipe 3 can be sleeved with the heat exchange circulating liquid pipe 4, and can also be arranged in parallel with the heat exchange circulating liquid pipe 4. The multiple horizontal water dividing wells increase the combustion range and increase the heat supply.
A power coal underground in-situ controllable combustion heat recovery and carbon sequestration integrated method comprises the following steps:
the first step, select the coal seam distribution district that is fit for carrying on carbon sequestration, avoid selecting to have coal seam that crack area etc. influences carbon sequestration.
And secondly, carrying out the installation of the power coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system.
And thirdly, injecting a circulating liquid serving as a heat-taking medium, preferably water, into the heat exchange circulating liquid pipe 4.
And fourthly, injecting combustion-supporting gas into the combustion-supporting gas supply pipe 3, switching on an electric ignition device, and igniting and burning the gas discharged from a gas outlet at the front end of the combustion-supporting gas supply pipe 3, wherein the electric ignition device can be an electric heating ignition device or an electromagnetic ignition device.
Fifthly, in the combustion process, the temperature in the target coal seam is gradually increased, and the heated circulating liquid is recycled and sent into the well after being subjected to heat exchange and utilization outside the well; in the combustion process, the pressure in the well is monitored through the pressure sensor, oxygen with enough pressure can be injected into the well, the coal bed is continuously combusted, flameout does not occur, meanwhile, the pressure change in the well is monitored through the pressure sensor, the pressure in the well is continuously increased firstly, and then the pressure starts to be reduced after reaching the peak value, and the fracturing of the stratum at the moment is shown; in the combustion process, the temperature of the combustion-supporting air supply pipe 3 is gradually increased, when the melting temperature of the high-temperature self-melting material on the sieve pipe is reached, sieve holes on the sieve pipe are sequentially opened from front to back, and combustion flame is guided to spread to the root along the horizontal section of the combustion-supporting air supply pipe 3. In the fifth step, the morphology of the combustion control area can be monitored by using geophysical monitoring means such as a wide-area electromagnetic method and the like, so that the design requirement is met; also can be by preceding a plurality of temperature sensor of interval arrangement in proper order after to on the screen pipe, the in-process that the sieve mesh on the screen pipe was opened in proper order after by preceding, temperature sensor destroys gradually to judge whether the coal seam burns to the horizontal segment root.
Sixthly, when the coal bed burns to the root of the horizontal section, stopping supplying combustion-supporting gas to extinguish the combustion area, continuously taking heat by using waste heat through the heat exchange circulating liquid pipe 4, and then sealing the wellhead pipeline; the sealing of the well head pipeline is combined with the combustion cavity, the hole sealing structure of the well wall and the peripheral rock stratum to carry out underground in-situ sealing and storing, also called permanent sealing and storing.
The method replaces the coal underground mining technology, and simultaneously, the safety problem of coal underground mining and the problem of underground water drainage are fundamentally solved; the method replaces the power coal power generation technology, and simultaneously replaces the thermal power plant pollution treatment technology and the carbon capture and carbon sequestration technology after combustion; the coal underground gasification technology with the aim of power generation is replaced, mixed gas is not produced, and heat energy is directly produced; the electric power is directly transmitted, so that a large amount of transportation capacity is reduced; can utilize deep coal resources below 1000 m.
The utility model discloses a technical route be, through bury in advance in the combustion area or lay combustion-supporting air supply pipe and heat exchange circulating fluid pipe through the well drilling, after the coal seam ignition, through controlling sustainable burning in coal seam and burning direction, ensure the complete controllable burning in coal seam, gather the coal seam heat of combustion through predetermined heat exchange circulating fluid pipe, the heat of gathering is again passed through the heat exchange for heat energy utilization such as electricity generation, heat supply, the CO that the burning produced 2 、SO 2 The nitrogen oxides and the combustion waste residues are directly and automatically sealed underground and absorbed and solidified by stratum and stratum water. The implementation of the scheme forms a brand new power coal utilization technical route, changes the current coal mining, transportation, power generation and heat supply pattern, forms a brand new underground in-situ combustion, heat collection, power generation and heat supply pattern of coal, and greatly reduces CO in the process of mining, transporting and utilizing the power coal 2 、SO 2 And the emission of nitrogen oxides eliminates the emission of waste residues generated by combustion of power coal, and realizes the aim of green development and utilization from low emission to zero emission of the power coal. If the drilling is carried out, the diameter of a horizontal section of a borehole meeting the requirements of three layers of casings is above 244.5mm, and the corresponding borehole diameter of a straight pipe section is increased on the basis.
If the oxygen supply is stopped, the burning coal bed automatically extinguishes due to oxygen deficiency, and the in-situ burning of the coal bed is stopped, so that the continuous oxygen supply is ensured in the burning process. At the same time, the high-temperature high-pressure (or supercritical) CO generated by combustion 2 、SO 2 Gas such as nitrogen oxides rapidly permeates into surrounding relatively low-pressure stratum through fractures and pores under the action of differential pressure, and is neutralized by cations such as Ca +, Mg +, Fe + and the like in the stratum and stratum water to form solid minerals such as calcium carbonate, magnesium carbonate and the like, and the solid minerals are permanently sealed; the solid waste generated by combustion is directly sealed in the combustion space area. The novel power coal underground in-situ combustion heat production-carbon sequestration technology comprehensively changes the traditional complex power coal combustion power generation technical routes of coal mining, washing, transportation, power plant combustion heat production power generation, desulfurization, denitration, carbon capture, carbon sequestration and the like, and realizes the purposes of obtaining the heat energy of the power coal and combusting CO generated by the power coal 2 And the green and environment-friendly utilization mode of directly sealing and storing greenhouse gases and solid wastes is realized.

Claims (6)

1. The utility model provides a power coal underground normal position L type gas feed burning, L type heat recovery and carbon sequestration system, includes vertical well (1), horizontal well (2), its characterized in that: the coal mine underground coal mine, a pressure sensor is installed in the well, and the heat exchange circulating liquid pipe (4) is connected with a ground heat exchanger for power generation or heat supply;
the vertical well (1) and the horizontal well (2) are respectively provided, one end of the horizontal well (2) is communicated with the lower end of the vertical well (1), the whole body is L-shaped, and the heat exchange circulating liquid pipe (4) and the combustion-supporting air supply pipe (3) are L-shaped and are laid along the vertical well (1) and the horizontal well (2); the heat exchange circulating liquid pipe (4) adopts a double-layer sleeve structure, the front end of the outer sleeve is closed, and the front end of the inner sleeve is opened to be communicated with the outer sleeve; the combustion-supporting air supply pipe (3) is arranged outside the heat exchange circulating liquid pipe (4) in parallel or sleeved outside the heat exchange circulating liquid pipe (4).
2. The powered coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system according to claim 1, characterized in that: the horizontal wells (2) adopt a structural form of a plurality of horizontal wells, and one end of each horizontal well (2) is communicated with the lower end of the vertical well (1); correspondingly, the horizontal sections of the heat exchange circulating liquid pipe (4) and the combustion-supporting air supply pipe (3) adopt a branch pipe structure, and a branch pipe is arranged in each horizontal well.
3. The powered coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system according to claim 1, characterized in that: and a concrete hole sealing structure is adopted between the combustion-supporting gas supply pipe (3), the heat exchange circulating liquid pipe (4) and the wall of the vertical well (1).
4. The powered coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system according to claim 1, characterized in that: the pressure sensor is arranged on the inner wall of the combustion-supporting gas supply pipe (3) close to the wellhead.
5. The powered coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system according to claim 1, characterized in that: the sieve tube structure (3a) adopts a high-temperature material resistant to 500-700 ℃ to carry out hole sealing.
6. The powered coal underground in-situ L-shaped gas supply combustion, L-shaped heat recovery and carbon sequestration system according to claim 1, characterized in that: the pipe diameter of the screen pipe structure (3a) is not less than 65 mm.
CN202220953129.4U 2021-06-22 2022-04-24 Power coal underground in-situ L-shaped gas supply combustion, L-shaped heat production and carbon sequestration system Active CN217330285U (en)

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US4018279A (en) * 1975-11-12 1977-04-19 Reynolds Merrill J In situ coal combustion heat recovery method
US4019577A (en) * 1976-02-23 1977-04-26 Mobil Oil Corporation Thermal energy production by in situ combustion of coal
CN201083119Y (en) * 2007-03-30 2008-07-09 四川石油管理局钻采工艺技术研究院 Oil gas well completion temporary block liner tube
CN102094615A (en) * 2010-12-17 2011-06-15 中国石油集团长城钻探工程有限公司 Coal bed gas horizontal well thermal sieve tube well completion method
US8915084B2 (en) * 2012-03-08 2014-12-23 7238703 Canada Inc. Heat energy extraction system from underground in situ combustion of hydrocarbon reservoirs
CN105545270B (en) * 2015-12-15 2017-12-26 大连理工大学 A kind of situ combustion method gas hydrate mining methods and device
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