System and method for underground in-situ directional conversion of carbon-based energy

Abstract

A system and method for underground in-situ directional conversion of carbon-based energy, in which a recovery well is connected from the ground to the carbon-based energy layer, and an outlet valve is provided in the recovery well. After the conversion well is directionally drilled from the ground to the carbon-based energy layer, it is drilled from one end of the carbon-based energy layer to the other end until it is connected to the bottom of the recovery well, thereby forming a channel in the carbon-based energy layer. The injection pipe is located in the conversion well and can be moved at any position in the channel to inject a reaction medium. The active medium injection port or the active medium excitation device is connected to the injection pipe so that the reaction medium is excited or dissociated into an active medium under the action of an energy field. The active medium is transported and diffused at multiple angles in the channel of the carbon-based energy layer to convert the carbon-based energy into oil or gas products; an online monitoring system is installed at the wellhead of the recovery well to monitor the flow, composition, pressure and temperature of the oil or gas product in real time. The system can efficiently and stably convert carbon-based energy in situ into oil, gas, heat and other products.

Description

Technical Field

[0001] The present invention relates to the technical field of coal bed gasification, and in particular to a system and method for underground in-situ directional conversion of carbon-based energy. Background Art

[0002] In recent years, deep underground coal gasification technology has attracted widespread attention in the chemical mining methods of deep carbon-based energy, low-grade carbon-based energy, and difficult-to-mine carbon-based energy. Deep underground coal gasification technology integrates well construction, coal mining and conversion, eliminating the process of mechanical mining, transportation, washing and furnace construction during utilization, and can effectively reduce carbon emissions in the coal mining process. In-situ coal seam gasification first uses vertical drilling and directional drilling to build an underground gasifier in the gasified coal seam, ignites at one end of the gasifier, and injects a gasifier at the other end to react with the coal seam to produce coal gas, which is discharged to the ground through vertical drilling. However, since underground coal gasification is an endothermic reaction, the traditional underground coal gasification technology mainly injects gasifiers in the form of air, pure oxygen or oxygen-enriched oxygen and water or carbon dioxide. That is, oxygen must be injected into the coal seam to burn part of the coal seam to provide heat for the gasification reaction, resulting in the carbon dioxide content in the coal gas of traditional coal seam gasification reaching about 40%. In addition, due to the density of underground coal seams, the gasification reaction rate is low and the production intensity is low; the traditional coal seam gasification reaction is regulated by the injected gasification agent, and the expansion of the gasification surface is difficult to control, resulting in a low resource recovery rate, which indirectly leads to an increase in the energy consumption per unit coal seam development. Therefore, the large-scale development of coal resources using traditional underground coal gasification still has problems such as low gasification efficiency, low production intensity, poor directional control, and high carbon emissions.

[0003] In view of the technical, economic, safety and environmental problems faced by conventional mining methods in deep carbon-based energy, low-grade carbon-based energy, and difficult-to-mine carbon-based energy, there is an urgent need for an efficient, safe, economical and environmentally friendly carbon-based energy directional conversion method to convert underground carbon-based energy into the oil and gas products that my country urgently needs.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a system and method for underground in-situ directional conversion of carbon-based energy. In view of the problems faced by the in-situ conversion process of carbon-based energy, such as low gasification efficiency, low production intensity, poor directional control, and large carbon emissions, the present invention excites and dissociates the reaction medium through methods including but not limited to electric fields, magnetic fields, radiation, heat, and light energy, to generate active media such as photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, and negative ions. The active medium transportation method relies on the ground magnetic field, electric field, pipeline, or underground in-situ divergence, etc., to heat, activate, decompose, reduce, and oxidize the underground carbon-based energy in situ, and efficiently convert it into clean high calorific value oil, gas, or high-grade heat products. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A carbon-based energy underground in-situ directional conversion system of the present invention comprises:

[0007] The recovery well is connected from the ground to the carbon-based energy layer, and the recovery well is equipped with an outlet valve.

[0008] The conversion well is directionally drilled from the ground to the carbon-based energy layer, and then drilled from one end of the carbon-based energy layer to the other end until it is connected to the bottom of the recovery well, thereby forming a channel in the carbon-based energy layer.

[0009] an injection pipe, which is located in the conversion well and can be moved to any position in the channel to inject the reaction medium,

[0010] An active medium injection port or an active medium excitation device connected to the injection pipe enables the reaction medium to be excited or dissociated into an active medium under the action of the energy field. The active medium is transported and diffused at multiple angles in the carbon-based energy layer channel to convert the carbon-based energy into oil or gas products;

[0011] An online monitoring system is installed at the wellhead of a recovery well to monitor the flow, composition, pressure and temperature of oil or gas products in real time.

[0012] In the underground in-situ directional conversion system for carbon-based energy, the energy field includes electric field, magnetic field, radiation field, thermal field and light energy field.

[0013] In the underground in-situ directional conversion system for carbon-based energy, the active medium includes photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, and negative ions.

[0014] In the underground in-situ directional conversion system for carbon-based energy, the reaction medium includes liquid water, water vapor, CO2, N2, Ar, He, H2, air, O2, enriched oxygen and a combination of two or more thereof.

[0015] In the underground in-situ directional conversion system for carbon-based energy, the ways in which the reaction medium is excited or dissociated under the action of the energy field include DC arc discharge plasma, AC discharge plasma, radio frequency glow discharge plasma, microwave discharge plasma, capacitively coupled discharge plasma, inductively coupled discharge plasma, magnetron discharge plasma, electron cyclotron resonance discharge plasma, spiral wave discharge plasma, dielectric barrier discharge plasma, microwave heating, and laser.

[0016] In the underground in-situ directional conversion system for carbon-based energy, the channel is located at the upper, middle or lower part of the carbon-based energy layer, and the horizontal angle range of the channel is -75° to 75°.

[0017] In the underground in-situ directional conversion system for carbon-based energy, the active medium is transported and diffused from the ground into the carbon-based energy layer through a magnetic field, an electric field or a pipeline.

[0018] In the underground in-situ directional conversion system for carbon-based energy, a recovery pipe extending to the channel for collecting oil or gas products is provided in the recovery well.

[0019] In the underground in-situ directional conversion system for carbon-based energy, the active medium injection port or active medium excitation device transports and diffuses the active medium in multiple dimensions at multiple angles of 0 to 360 degrees on the upper side, lower side, left side, and right side of the carbon-based energy layer channel.

[0020] A conversion method of a carbon-based energy underground in-situ directional conversion system includes:

[0021] After the conversion well is directionally drilled from the ground to the carbon-based energy layer, it is drilled from one end of the carbon-based energy layer to the other end until it is connected with the bottom of the recovery well, thereby forming a channel in the carbon-based energy layer and connecting with the ground;

[0022] The injection pipe is moved to any position in the channel to inject the reaction medium, start the active medium excitation device, and the active medium is transported and diffused from the ground to the carbon-based energy layer channel at multiple angles through the magnetic field, electric field or pipeline. The reaction medium flow rate and the power of the active medium excitation device are gradually adjusted. According to the changes in the flow rate, composition, temperature and pressure of the oil or gas product fed back by the online monitoring system at the outlet of the recovery well, it is judged whether the conversion production of the carbon-based energy layer has been started. When heavy oil, shale oil and other oil products are extracted by N2, Ar, He active media, when the mass ratio of liquid hydrocarbons at the outlet of the recovery well is greater than 5%, it indicates that the conversion production has been started; when coalbed methane, shale gas and tight gas are extracted by N2, Ar, He active media, when the volume ratio of CH4 in the gas at the outlet of the recovery well is greater than 10%, it indicates that the conversion production has been started. The conversion production has been started; when the coal seam is pyrolyzed by N2, Ar, He active medium, the volume ratio of CH4+H2+CO in the gas at the outlet of the recovery well is greater than 20%, indicating that the conversion production has been started; when the coal seam and oil shale layer are hydrogenated by H2 active medium, the volume ratio of CH4 in the gas at the outlet of the recovery well is greater than 20%, indicating that the conversion production has been started; when the oil, coal, and oil shale carbon-based energy layer is gasified by water and CO2 active medium, the volume ratio of H2+CO in the gas at the outlet of the recovery well is greater than 30%, indicating that the conversion production has been started; when the oil, natural gas, coal, and oil shale carbon-based energy layer is oxidized by air, O2, oxygen-rich active medium, the volume ratio of CO2 in the gas at the outlet of the recovery well is greater than 50%, indicating that the conversion production has been started;

[0023] Gradually increase the reaction medium flow rate and the excitation device power to 60%~100% load. When the movement judgment basis is lower than the preset threshold, the injection pipe is controlled by the ground to move 5~100m, that is, when extracting heavy oil and shale oil through N2, Ar, and He active media, the threshold is the mass ratio of liquid hydrocarbons at the outlet of the recovery well <10%; when extracting coalbed methane, shale gas, and tight gas through N2, Ar, and He active media, the threshold is the volume ratio of CH4 in the gas at the outlet of the recovery well <50%; when pyrolyzing coal seams through N2, Ar, and He active media, the threshold is the volume ratio of CH4 in the gas at the outlet of the recovery well <50%. The volume ratio of CH4+H2+CO in the gas at the outlet of the recovery well is less than 50%; when hydrogenation is carried out through H2 active medium with coal seams and oil shale layers, the threshold is that the volume ratio of CH4 in the gas at the outlet of the recovery well is less than 50%; when gasification is carried out through water and CO2 active medium with oil, coal, and oil shale carbon-based energy layers, the threshold is that the volume ratio of H2+CO in the gas at the outlet of the recovery well is less than 60%; when oxidation is carried out through air, O2, and oxygen-rich active medium with oil, natural gas, coal, and oil shale carbon-based energy layers, the threshold is that the volume ratio of CO2 in the gas at the outlet of the recovery well is less than 50%;

[0024] This cycle continues until the carbon-based energy layer covering the conversion well and the recovery well is completely consumed.

[0025] In the above technical scheme, a carbon-based energy underground in-situ directional conversion system and method provided by the present invention has the following beneficial effects: in order to address the problems faced by traditional mining methods in the in-situ conversion process of carbon-based energy, such as low gasification efficiency, low production intensity, poor directional control, and large carbon emissions, the reaction medium is excited and dissociated by means of, but not limited to, electric fields, magnetic fields, radiation, heat, and light energy, to generate active media such as photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, and negative ions. The active medium transportation method relies on the ground magnetic field, electric field, pipeline or underground in-situ divergence, etc., to heat, activate, decompose, reduce and oxidize the underground carbon-based energy in situ, and efficiently convert it into clean high calorific value oil, gas or high-grade heat products. The system solves the technical, economic, safety and environmental problems faced by conventional mining methods in deep carbon-based energy, low-grade carbon-based energy, and difficult-to-mine carbon-based energy, and converts underground carbon-based energy into oil and gas products that my country urgently needs. It can be used for the development and utilization of carbon-based energy such as coal, peat, oil sands, coal gangue, oil shale, and heavy oil layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic structural diagram of a carbon-based energy underground in-situ directional conversion system provided for one embodiment of the present invention.

[0028] Figure 2 A schematic structural diagram of a carbon-based energy underground in-situ directional conversion system provided for one embodiment of the present invention.

[0029] Figure 3 A process flow chart of a method for underground in-situ directional conversion of a carbon-based energy layer provided in accordance with one embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] See also Figure 1-2 As shown, in one embodiment, a carbon-based energy underground in-situ directional conversion system of the present invention includes:

[0039] The recovery well 7 is connected from the ground to the carbon-based energy layer 1, and the recovery well 7 is provided with an outlet valve 9.

[0040] The conversion well 6 is directionally drilled from the ground to the carbon-based energy layer 1, and then drilled from one end of the carbon-based energy layer 1 to the other end until it is connected to the bottom of the recovery well 7, thereby forming a channel 2 in the carbon-based energy layer 1.

[0041] an injection pipe 3, which is located in the conversion well 6 and can be moved to any position in the channel 2 to inject the reaction medium,

[0042] An active medium injection port or active medium excitation device 4, which is connected to the injection pipe 3 so that the reaction medium is excited or dissociated into active medium 5 under the action of the energy field, and the active medium 5 is transported and diffused at multiple angles in the channel 2 of the carbon-based energy layer 1 to convert the carbon-based energy into oil or gas products;

[0043] The online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor the flow, composition, pressure and temperature of the oil or gas product in real time.

[0044] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the energy field includes an electric field, a magnetic field, a radiation field, a thermal field and a light energy field.

[0045] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the active medium 5 includes photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, and negative ions.

[0046] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the reaction medium includes liquid water, water vapor, CO2, N2, Ar, He, H2, air, O2, enriched oxygen, and a combination of two or more thereof.

[0047] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the ways in which the reaction medium is excited or dissociated under the action of the energy field include DC arc discharge plasma, AC discharge plasma, radio frequency glow discharge plasma, microwave discharge plasma, capacitively coupled discharge plasma, inductively coupled discharge plasma, magnetron discharge plasma, electron cyclotron resonance discharge plasma, helicon wave discharge plasma, dielectric barrier discharge plasma, microwave heating, and laser.

[0048] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the channel 2 is located at the upper, middle or lower part of the carbon-based energy layer 1, and the horizontal angle range of the channel 2 is -75° to 75°.

[0049] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, a magnetic field, an electric field or a pipeline is arranged in the injection pipe 3 .

[0050] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, a recovery pipe 10 extending to the channel 2 for collecting oil or gas products is provided in the recovery well 7 .

[0051] In a preferred embodiment of the underground in-situ directional conversion system for carbon-based energy, the active medium excitation device 4 includes a plasma generator.

[0052] See also Figure 3 As shown, in one embodiment, a conversion method of a carbon-based energy underground in-situ directional conversion system of the present invention includes:

[0053] After the conversion well 6 is directionally drilled from the ground to the carbon-based energy layer 1, it is drilled from one end of the carbon-based energy layer 1 to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the carbon-based energy layer 1 and connecting with the ground;

[0054] The injection pipe 3 moves at any position in the channel 2 to inject the reaction medium, and the reaction medium is excited or dissociated into the active medium 5 under the action of the energy field. The active medium 5 is transported and diffused at multiple angles in the channel 2 of the carbon-based energy layer 1 to convert the carbon-based energy into oil or gas products;

[0055] According to the feedback of the online monitoring system 8 at the outlet of the recovery well 7 on the changes in oil or gas product flow, composition, temperature and pressure, the reaction medium flow and the excitation device power are gradually increased to 60%~100% load. When the movement judgment basis is lower than the predetermined threshold, the injection pipe 3 is controlled by the ground to move 5~100m, and this cycle is repeated until the carbon-based energy layer 1 covering the conversion well 6 and the recovery well 7 is completely consumed.

[0056] In one embodiment, the present invention excites and dissociates the reaction medium through external energy, including but not limited to electric field, magnetic field, radiation, heat and light energy, to generate active media such as photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions and negative ions. The present invention relies on active medium transportation methods such as ground magnetic field, electric field, pipeline or underground in-situ divergence to heat, activate, decompose, reduce and oxidize underground carbon-based energy in situ, and efficiently convert it into clean high calorific value oil, gas or high-grade heat products. The method of exciting and dissociating the reaction medium with the external energy includes but is not limited to direct current arc discharge plasma, alternating current discharge plasma, radio frequency glow discharge plasma, microwave discharge plasma, capacitive coupled discharge plasma, inductively coupled discharge plasma, magnetron discharge plasma, electron cyclotron resonance discharge plasma, spiral wave discharge plasma, dielectric barrier discharge plasma, high-power microwave heating, high-power laser, etc., to generate high-intensity electric field, magnetic field, radiation, heat or light energy, etc.; the reaction medium includes but is not limited to liquid water, water vapor, CO2, N2, Ar, He, H2, air, O2, oxygen-rich, etc., and a combination of two or more thereof. The molecules or atoms in the reaction medium are excited and dissociated by the external energy, etc., to generate active media such as photons, electrons, excited atoms or molecules, ground atoms or molecules, positive ions, negative ions, etc.; the active media can be transported and diffused from the ground to the carbon-based energy layer 1 through a magnetic field, an electric field or a pipeline, or the active media are generated in situ through the carbon-based energy layer 1 and diffused;

[0057] The active medium produced by the different reaction media can realize different carbon-based energy conversion functions. For example, the active medium formed after the inert gas such as N2, Ar, He is excited and dissociated can heat the carbon-based energy layer 1 through photon radiation, particle kinetic energy and vibration energy to make it heat up and then thermally crack. The particle decomposition energy can trigger the decomposition reaction of the carbon-based energy. For carbon-based energy such as heavy oil and shale oil, its viscosity can be reduced to improve the recovery rate; for gaseous carbon-based energy such as coalbed methane, shale gas, and tight gas, the thermal cracking of coal rock can increase the porosity and enhance the gas desorption effect to improve the recovery rate of gaseous energy; for solid carbon-based energy such as coal, it can be pyrolyzed by heating to produce high calorific value energy such as pyrolysis oil, methane, hydrogen, and carbon monoxide. Further, the active medium formed after the gas such as H2 is excited and dissociated can undergo hydrogenation reaction with the semi-coke remaining from the coal pyrolysis reaction to efficiently produce high calorific value energy such as methane. For example, the active medium formed after the excitation and dissociation of gases such as liquid water, water vapor, and CO2, in addition to the above-mentioned heating decomposition effect, can quickly undergo reduction reactions with carbon-based energy due to its strong reactivity, producing a large amount of high calorific value energy such as H2 and CO; for example, the active medium formed after the excitation and dissociation of oxidizing media such as air, O2, and oxygen-rich further improves the molecular oxidation activity, can quickly undergo combustion reactions with carbon-based energy, and release a large amount of high-grade heat, which is discharged to the ground for heating;

[0058] The active medium is located in the carbon-based energy layer 1, and the release position of the active medium is controlled by the injection pipe 3, and the injection pipe 3 is located in the conversion well 6. After the conversion well 6 is directionally drilled from the ground to the carbon-based energy layer 1, it is drilled from one end of the carbon-based energy layer 1 to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the carbon-based energy layer 1 and connecting with the ground. The channel 2 can be at any position in the upper, middle or lower part of the carbon-based energy layer 1, and the horizontal angle range of the channel 2 is -75°~75°. The injection pipe 3 can be moved at any position in the channel 2, and an active medium injection port or an active medium excitation device 4 is installed at the end of the injection pipe 3. The active medium can be excited and dissociated by the ground excitation device, and transported to the target area of ​​the carbon-based energy layer 1 by setting a magnetic field, electric field or pipeline in the injection pipe 3, or the reaction medium gas is transported to the carbon-based energy layer 1 by the injection pipe 3, and the active medium is excited and dissociated in situ by the excitation device at the port of the injection pipe 3 to produce the active medium; the active medium injection port or the active medium excitation device 4 can transport and diffuse the active medium in multiple dimensions, 0~360° and multiple angles on the upper side, lower side, left side and right side of the channel 2 of the carbon-based energy layer 1; the high calorific value oil, gas or high-grade heat and other products flow to the recovery well 7 through the channel 2 processed in the carbon-based energy layer 1 and are discharged to the ground. The recovery well 7 can be set with different recovery structures according to the difference between the reaction medium and the target product. When high calorific value gaseous energy is the target product, the recovery well 7 can be in the form of a vertical well, and the gas is transported to the ground by gas diffusion. A gas online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor key parameters such as gas flow, composition and pressure in real time to provide feedback on the working conditions of the underground reaction zone; when high calorific value liquid oil or high calorific value heat is the target product, the recovery well 7 can be in the form of a directional well, connected from the ground to the carbon-based energy layer 1, and a recovery pipe 10 is installed in the wellbore. The recovery pipe 10 can move arbitrarily in the processing channel 2 of the carbon-based energy layer 1, and moves accordingly according to changes in the active medium reaction area to recover fresh oil or hot gas. A multifunctional online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor parameters such as oil or hot gas flow, composition and temperature to provide feedback on the working conditions of the underground reaction zone.

[0059] When the conversion reaction of the carbon-based energy layer 1 is started for the first time, the injection pipe 3 is controlled to inject the reaction medium at a position 105-100m away from the recovery well 7 or the recovery pipe 105-100m away from the carbon-based energy layer 1, and the active medium excitation device 4 is started. According to the product flow, composition, temperature and other data fed back by the online monitoring system 8 of the recovery well 7, the successful start-up judgment basis is as follows. Figure 3 , judge whether the conversion reaction is successfully started. After successful startup, gradually increase the reaction medium flow and the excitation device power to 80%~100% load and run for a long time. According to the movement judgment basis, judge the timing of injection pipe 3 movement, see Figure 3When the relevant index is lower than the movement judgment basis, the injection pipe 3 is controlled by the ground to move 5-100m to continue the carbon-based energy conversion reaction. This cycle is repeated until the carbon-based energy layer 1 between the conversion well 6 and the recovery well 7 is completely consumed, and then the relevant conversion process is carried out again in the new conversion unit.

[0060] In one embodiment, the conversion method comprises,

[0061] 1) Installation

[0062] After the conversion well 6 is directionally drilled from the ground to the carbon-based energy layer 1, it is drilled from one end of the carbon-based energy layer 1 to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the carbon-based energy layer 1 and connecting with the ground. The injection pipe 3 can move to any position in the channel 2, and an active medium injection port or an active medium excitation device 4 is installed at the end of the injection pipe 3.

[0063] The recovery well 7 can be provided with different recovery structures according to the difference between the reaction medium and the target product. When the target product is high calorific value gaseous energy, the recovery well 7 can be in the form of a vertical well, which is transported to the ground by gas diffusion, and a gas online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor key parameters such as gas flow, composition and pressure in real time; when the target product is high calorific value liquid oil or high calorific value heat, the recovery well 7 can be in the form of a directional well, which is connected from the ground to the carbon-based energy layer 1, and a recovery pipe 10 is installed in the wellbore, and the recovery pipe 10 can be moved arbitrarily in the channel 2 of the carbon-based energy layer 1, and a multifunctional online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor parameters such as oil or hot gas flow, composition and temperature.

[0064] 2) Initiation of conversion reaction

[0065] By applying external energy, including but not limited to electric field, magnetic field, radiation, heat and light energy, the reaction medium is excited and dissociated to generate active media such as photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions and negative ions. By relying on the active medium transportation methods such as ground magnetic field, electric field, pipeline or underground in-situ divergence, the underground carbon-based energy is heated, activated, decomposed, reduced and oxidized in situ, and efficiently converted into clean high calorific value oil, gas or high-grade heat products.

[0066] Exciting and dissociating the reaction medium by adding external energy, including but not limited to DC arc discharge plasma, AC discharge plasma, radio frequency glow discharge plasma, microwave discharge plasma, capacitively coupled discharge plasma, inductively coupled discharge plasma, magnetron discharge plasma, electron cyclotron resonance discharge plasma, helicon wave discharge plasma, dielectric barrier discharge plasma, high-power microwave heating, high-power laser, etc., to generate strong electric field, magnetic field, radiation, heat or light energy, etc.;

[0067] The reaction medium includes but is not limited to liquid water, water vapor, CO2, N2, Ar, He, H2, air, O2, oxygen-enriched, etc., and a combination of two or more thereof. The molecules or atoms in the reaction medium are excited or dissociated by the external energy to generate active media such as photons, electrons, excited atoms or molecules, ground atoms or molecules, positive ions, negative ions, etc.;

[0068] The active medium 5 produced by the different reaction media can realize different carbon-based energy conversion functions. For example, the active medium formed after the inert gas such as N2, Ar, He is excited and dissociated can heat the carbon-based energy layer 1 through photon radiation, particle kinetic energy and vibration energy to make it heat up and then thermally crack. The particle decomposition energy can trigger the decomposition reaction of the carbon-based energy. For carbon-based energy such as heavy oil and shale oil, its viscosity can be reduced to improve the recovery rate; for gaseous carbon-based energy such as coalbed methane, shale gas, and tight gas, the thermal cracking of coal rock can increase the porosity and enhance the gas desorption effect to improve the recovery rate of gaseous energy; for solid carbon-based energy such as coal, it can be pyrolyzed by heating to produce high calorific value energy such as pyrolysis oil, methane, hydrogen, and carbon monoxide. Further, the active medium formed after the gas such as H2 is excited and dissociated can undergo hydrogenation reaction with the semi-coke remaining from the coal pyrolysis reaction to efficiently produce high calorific value energy such as methane. For example, the active medium formed after the excitation and dissociation of gases such as liquid water, water vapor, and CO2, in addition to the above-mentioned heating decomposition effect, can quickly undergo reduction reactions with carbon-based energy due to its strong reactivity, producing a large amount of high calorific value energy such as H2 and CO; for example, the active medium formed after the excitation and dissociation of oxidizing media such as air, O2, and oxygen-rich further improves the molecular oxidation activity, can quickly undergo combustion reactions with carbon-based energy, and release a large amount of high-grade heat, which is discharged to the ground for heating;

[0069] The active medium can be excited and dissociated by a ground excitation device, and transported to the target area of ​​the carbon-based energy layer 1 by using a magnetic field, an electric field or a pipeline set in the injection pipe 3, or the reaction medium gas is transported to the carbon-based energy layer 1 through the injection pipe 3, and the active medium is in situ excited and dissociated by an excitation device installed at the injection pipe 3 port in the carbon-based energy target area;

[0070] When the conversion reaction of the carbon-based energy layer 1 is started for the first time, the injection pipe 3 is controlled to inject the reaction medium at a position 105-100m away from the recovery well 7 or the recovery pipe in the carbon-based energy layer 1, the active medium excitation device 4 is started, and the outlet valve 9 of the recovery well 7 is opened. According to the product flow, composition, temperature and other data fed back by the online monitoring system 8 of the recovery well 7, the successful start-up judgment basis is as follows, Figure 3 As shown, it is determined whether the conversion reaction is successfully initiated.

[0071] 3) Main operations of the conversion process

[0072] After successful startup, the reaction medium flow rate and the excitation device power are gradually increased to 60%~100% load according to the product flow, composition, temperature and pressure changes fed back by the online monitoring system 8 at the outlet of the recovery well 7, and the operation is carried out for a long time. The timing of moving the injection pipe 3 is determined based on the movement judgment basis, see Figure 3 When the relevant index is lower than the movement judgment basis, the injection pipe 3 is controlled by the ground to move 5-100m to continue the carbon-based energy conversion reaction. This cycle is repeated until the carbon-based energy layer 1 between the conversion well 6 and the recovery well 7 is completely consumed, and then the relevant conversion process is carried out again in the new conversion unit.

[0073] 4) Main operations for conversion termination or emergency stop

[0074] When the carbon-based energy layer 1 covering the conversion well 6 and the recovery well 7 is completely consumed and the furnace needs to be shut down, or when the furnace needs to be shut down in an emergency, the power supply of the active medium excitation device 4 is first turned off, and inert gas such as nitrogen is transported to the underground reaction area through the injection pipe 3 to purge the reaction area. When the target product content is less than 1%, the outlet valve 9 of the recovery well 7 is closed. The furnace shutdown or emergency shutdown is completed.

[0075] Example 1: (Nitrogen medium radio frequency glow plasma for heavy oil thermal recovery process)

[0076] The embodiment of the present invention provides a method for thermal recovery of heavy oil using a high-activity medium.

[0077] After the conversion well 6 is directionally drilled from the ground to the target oil layer, it is drilled from one end of the oil layer to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the oil layer and connecting with the ground. The injection pipe 3 can move to any position in the channel 2, and a radio frequency glow plasma device is installed at the end of the injection pipe 3.

[0078] The recovery well 7 is a directional well, connected from the ground to the heavy oil layer, a recovery pipe 10 is installed in the wellbore, and the recovery pipe 10 can move arbitrarily in the heavy oil layer processing channel 2. A multifunctional online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor parameters such as oil flow, composition and temperature.

[0079] With nitrogen as the working medium, electric field energy is applied through radio frequency glow discharge plasma to excite and dissociate nitrogen in situ in the oil layer, generating active media such as photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, negative ions, etc. The temperature is increased layer by layer through photon radiation, particle kinetic energy and vibration energy, which can reduce its viscosity. At the same time, the particle decomposition energy can induce decomposition reaction in part of the oil layer to improve the recovery rate.

[0080] When starting the process, the injection pipe 3 is controlled to be 50m away from the bottom of the recovery well 7 in the oil layer, the recovery pipe 10 is controlled to be about 10m away from the injection pipe 3, nitrogen is injected, the radio frequency glow discharge plasma device is started, and the outlet valve 9 of the recovery well 7 is opened. According to the feedback of the product flow, composition, temperature and other data from the online monitoring system 8 of the recovery well 7, when the mass ratio of liquid hydrocarbons in the export product is higher than 5%, it indicates that the heavy oil thermal recovery process has been successfully started.

[0081] After successful startup, the nitrogen flow rate and the power of the radio frequency glow discharge plasma device are gradually increased to 60%~100% load according to the product flow, composition and temperature changes fed back by the online monitoring system 8 at the outlet of the recovery well 7, and long-term operation is carried out. When the liquid hydrocarbon content in the product is less than 10%, the injection pipe 3 is moved 50m by ground control to continue the heavy oil conversion reaction. This cycle is repeated until the oil layer covering the conversion well 6 and the recovery well 7 is completely consumed, and then the relevant conversion process is carried out again in the new conversion unit.

[0082] Example 2: (Water medium AC arc discharge plasma is used for reduction reaction of oil shale layer to produce hydrogen and carbon monoxide gas)

[0083] The embodiment of the present invention provides a method for producing hydrogen and carbon monoxide gas by using a high-activity medium in a reduction reaction of oil shale.

[0084] After the conversion well 6 is directionally drilled from the ground to the target oil shale layer, it is drilled from one end of the oil shale layer to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the oil shale layer and connecting with the ground. The injection pipe 3 can move to any position in the channel 2, and an AC arc discharge plasma device is installed at the end of the injection pipe 3.

[0085] The recovery well 7 is in the form of a vertical well, connected from the ground to the oil shale layer, and transported to the ground by gas diffusion. A gas online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor key parameters such as gas flow, composition and pressure in real time to provide feedback on the working conditions of the underground reaction zone.

[0086] With liquid water as the working medium, electric field energy is applied through AC arc discharge plasma to excite and dissociate the liquid water in situ in the oil shale layer to produce photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, negative ions and other active media. In addition to the heating decomposition effects of photon radiation, particle kinetic energy, vibration energy and decomposition energy, the active medium has strong reactivity and can quickly undergo reduction reaction with carbon-based energy to produce a large amount of high calorific value energy such as H2 and CO.

[0087] When starting the process, the injection pipe 3 is controlled to be at a position 30m away from the bottom of the recovery well 7 in the oil shale layer, liquid water is injected, the AC arc discharge plasma device is started, and the outlet valve 9 of the recovery well 7 is opened. According to the feedback of the product gas flow, composition and pressure data from the online monitoring system 8 of the recovery well 7, when the combined volume ratio of hydrogen and carbon monoxide in the export product is higher than 30%, it indicates that the oil shale reduction process has been successfully started.

[0088] After successful startup, according to the product flow, composition, and pressure changes fed back by the online monitoring system 8 at the outlet of the recovery well 7, the liquid water flow and the power of the AC arc discharge plasma device are gradually increased to 60%~100% load for long-term operation. When the combined volume ratio of hydrogen and carbon monoxide in the product is lower than 60%, the injection pipe 3 is controlled by the ground to move 30m to continue the oil shale conversion reaction. This cycle is repeated until the oil shale layer covering the conversion well 6 and the recovery well 7 is completely consumed, and then the relevant conversion process is carried out again in the new conversion unit.

[0089] Example 3: (Use of oxygen-rich medium DC arc discharge plasma to produce high-grade heat by oxidation reaction of peat layer)

[0090] The embodiment of the present invention provides a method for producing high-grade heat by using a high-activity medium for oxidation reaction of a low-grade resource peat layer.

[0091] After the conversion well 6 is directionally drilled from the ground to the target peat layer, it is drilled from one end of the oil layer to the other end until it is connected with the bottom of the recovery well 7, thereby forming a channel 2 in the oil layer and connecting with the ground. The injection pipe 3 can move to any position in the channel 2, and a DC arc discharge plasma device is installed at the end of the injection pipe 3.

[0092] The recovery well 7 is a directional well, connected from the ground to the peat layer, a recovery pipe 10 is installed in the wellbore, and the recovery pipe 10 can be moved arbitrarily in the peat layer processing channel 2. A multifunctional online monitoring system 8 is installed at the wellhead of the recovery well 7 to monitor parameters such as hot gas flow, composition and temperature.

[0093] Using oxygen-rich gas with a volume ratio of 60% oxygen and 40% nitrogen as the working medium, electric field energy is applied through DC arc discharge plasma to excite and dissociate the oxygen-rich gas in situ in the peat layer to produce photons, electrons, excited atoms or molecules, ground state atoms or molecules, positive ions, negative ions and other active media, further improving the molecular oxidation activity, which can quickly react with carbon-based energy to burn and release a large amount of high-grade heat, which is discharged to the ground for heating use.

[0094] When starting the process, the injection pipe 3 is controlled to inject rich oxygen at a position 60m away from the bottom of the recovery well 7 in the peat layer, the DC arc discharge plasma device is started, and the outlet valve 9 of the recovery well 7 is opened. According to the feedback of the hot gas flow, composition and temperature data from the online monitoring system 8 of the recovery well 7, when the volume ratio of carbon dioxide in the outlet gas is higher than 5%, it indicates that the peat oxidation process has been successfully started.

[0095] After successful startup, the oxygen-enriched flow rate and the power of the DC arc discharge plasma device are gradually increased to 60%~100% load according to the product flow, composition and temperature changes fed back by the online monitoring system 8 at the outlet of the recovery well 7, and long-term operation is carried out. When the volume ratio of carbon dioxide in the product is lower than 50%, the injection pipe 3 is controlled by the ground to move 60m to continue the peat conversion reaction. This cycle is repeated until the peat layer covering the conversion well 6 and the recovery well 7 is completely consumed, and then the relevant conversion process is carried out again in the new conversion unit.

[0096] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0097] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A conversion method using an underground in-situ directional conversion system for carbon-based energy, characterized in that: The underground in-situ directional conversion system of carbon-based energy includes: The recovery well is connected from the ground to the carbon-based energy layer, and the recovery well is equipped with an outlet valve. The conversion well is directionally drilled from the ground to the carbon-based energy layer, and then drilled from one end of the carbon-based energy layer to the other end until it is connected to the bottom of the recovery well, thereby forming a channel in the carbon-based energy layer. an injection pipe, which is located in the conversion well and can be moved to any position in the channel to inject the reaction medium, An active medium excitation device connected to the injection pipe enables the reaction medium to be excited or dissociated into an active medium under the action of the energy field. The active medium is transported and diffused at multiple angles in the carbon-based energy layer channel to convert the carbon-based energy into oil or gas products; An online monitoring system is installed at the wellhead of a recovery well to monitor the flow, composition, pressure and temperature of oil or gas products in real time. The active medium excitation device transports and diffuses the active medium at multiple angles of 0 to 360 degrees in multiple dimensions, such as the upper side, lower side, left side and right side of the carbon-based energy layer channel. The channel is in the upper, middle or lower part of the carbon-based energy layer, and the horizontal angle range of the channel is -75 degrees to 75 degrees. The recovery well is provided with a recovery pipe extending to the channel for collecting oil or gas products. The active medium includes photons, electrons, excited atoms or molecules, ground-state atoms or molecules, positive ions and negative ions. The transformation method comprises: After the conversion well is directionally drilled from the ground to the carbon-based energy layer, it is drilled from one end of the carbon-based energy layer to the other end until it is connected with the bottom of the recovery well, thereby forming a channel in the carbon-based energy layer and connecting with the ground; The injection pipe is moved to any position in the channel to inject the reaction medium, start the active medium excitation device, and the active medium is transported and diffused from the ground to the carbon-based energy layer channel at multiple angles through the magnetic field, electric field or pipeline. The reaction medium flow rate and the power of the active medium excitation device are gradually adjusted. According to the changes in the oil or gas product flow rate, composition, temperature and pressure fed back by the online monitoring system at the outlet of the recovery well, it is judged whether the conversion production of the carbon-based energy layer has been started. When heavy oil and shale oil are extracted by N2, Ar, and He active media, when the mass ratio of liquid hydrocarbons at the outlet of the recovery well is greater than 5%, it indicates that the conversion production has been started; when coalbed methane, shale gas, and tight gas are extracted by N2, Ar, and He active media, the volume ratio of CH4 in the gas at the outlet of the recovery well is greater than 10%, which indicates that the conversion Production has started; when the coal seam is pyrolyzed by N2, Ar, and He active media, the volume ratio of CH4+H2+CO in the gas at the outlet of the recovery well is greater than 20%, indicating that the conversion production has started; when the coal seam and oil shale layer are hydrogenated by H2 active media, the volume ratio of CH4 in the gas at the outlet of the recovery well is greater than 20%, indicating that the conversion production has started; when the oil, coal, and oil shale carbon-based energy layer is gasified by water and CO2 active media, the volume ratio of H2+CO in the gas at the outlet of the recovery well is greater than 30%, indicating that the conversion production has started; when the oil, natural gas, coal, and oil shale carbon-based energy layer is oxidized by air, O2, and oxygen-rich active media, the volume ratio of CO2 in the gas at the outlet of the recovery well is greater than 50%, indicating that the conversion production has started; Gradually increase the reaction medium flow rate and the excitation device power to 60%~100% load. When the movement judgment basis is lower than the preset threshold, the injection pipe is controlled by the ground to move 5~100m, that is, when extracting heavy oil and shale oil through N2, Ar, and He active media, the threshold is the mass ratio of liquid hydrocarbons at the outlet of the recovery well <10%; when extracting coalbed methane, shale gas, and tight gas through N2, Ar, and He active media, the threshold is the volume ratio of CH4 in the gas at the outlet of the recovery well <50%; when pyrolyzing coal seams through N2, Ar, and He active media, the threshold is the volume ratio of CH4 in the gas at the outlet of the recovery well <50%. The volume ratio of CH4+H2+CO in the gas at the outlet of the recovery well is less than 50%; when hydrogenation is carried out through H2 active medium with coal seams and oil shale layers, the threshold is that the volume ratio of CH4 in the gas at the outlet of the recovery well is less than 50%; when gasification is carried out through water and CO2 active medium with oil, coal, and oil shale carbon-based energy layers, the threshold is that the volume ratio of H2+CO in the gas at the outlet of the recovery well is less than 60%; when oxidation is carried out through air, O2, and oxygen-rich active medium with oil, natural gas, coal, and oil shale carbon-based energy layers, the threshold is that the volume ratio of CO2 in the gas at the outlet of the recovery well is less than 50%; This cycle continues until the carbon-based energy layer covering the conversion well and the recovery well is completely consumed.

2. The conversion method according to claim 1, characterized in that Energy fields include electric fields, magnetic fields, radiation fields, thermal fields and light energy fields.

3. The conversion method according to claim 1, characterized in that The reaction medium includes liquid water, water vapor, CO2, N2, Ar, He, H2, air, O2, enriched oxygen, and a combination of two or more thereof.

4. The conversion method according to claim 1, characterized in that The reaction medium is excited or dissociated under the action of the energy field by direct current arc discharge plasma, alternating current discharge plasma, radio frequency glow discharge plasma, microwave discharge plasma, capacitively coupled discharge plasma, inductively coupled discharge plasma, magnetron discharge plasma, electron cyclotron resonance discharge plasma, spiral wave discharge plasma, dielectric barrier discharge plasma, microwave heating, and laser.

5. The conversion method according to claim 1, characterized in that The active medium is transported and diffused from the ground to the carbon-based energy layer through a magnetic field, an electric field or a pipeline.

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