In-situ carbon storage and hydrogen production method by thermal co2 assisted electromagnetic heating

Abstract

The application discloses a kind of hot CO2 auxiliary electromagnetic heating in-situ carbon storage and hydrogen production collaborative method, belong to oil and gas reservoir in-situ carbon storage and hydrogen production technical field, solve the problem that current oxygen injection combustion reservoir in-situ hydrogen production will generate CO2 etc.Gas, method includes selecting target reservoir, and making well and setting up hydrogen production collaborative equipment, based on target reservoir type target reservoir modification and development, inject high temperature CO2, open electromagnetic heating hydrogen production and hydrogen production well microwave emission device continue heating reservoir to hydrogen production temperature and keep current reservoir temperature and pressure condition hydrogen production, open electromagnetic heating hydrogen production and hydrogen production well production: when hydrogen production rapidly declines, well shut down production;The application avoids the output of CO2 gas during hydrogen production, and simplifies the multiple injection process of oxygen-containing gas, water vapor, etc.;The application uses the method of injecting high-temperature CO2 to preheat the reservoir, which reduces the cost of electromagnetic heating, and also realizes the utilization and geological storage of CO2, thereby ensuring the CO2 geological storage and in-situ hydrogen production collaborative effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of in-situ carbon storage and hydrogen production in oil and gas reservoirs, and specifically relates to a method for in-situ carbon storage and hydrogen production assisted by hot CO2 and electromagnetic heating. BACKGROUND

[0002] Greenhouse gas emissions have led to increasingly serious global climate change issues. "Carbon peak and carbon neutrality" can help reduce greenhouse gas emissions and slow the speed of global warming. At the same time, hydrogen (H2) is considered to be the most promising clean energy in the 21st century. About 95% of hydrogen is produced by steam methane reforming (SMR) using natural gas and water as raw materials. The disadvantage of this technology is high carbon dioxide emissions, about 9-10 kg CO2e / kg H2, which increases the burden of CCUS to reduce the negative impact of greenhouse gas footprint. Integrating SMR and CCUS is a relatively mature technology, and it is a great challenge to significantly reduce its cost.

[0003] Converting oil and natural gas into clean hydrogen through underground thermal cracking and other methods is a technical solution that is expected to achieve decarbonization of the oil industry by 2050. In-situ hydrogen production in reservoirs can directly generate and extract hydrogen from oil and gas reservoirs, while using an underground hydrogen membrane separator to lock all carbon products underground. Based on the existing infrastructure of oil and gas fields, there is no need to extract, separate and transport hydrocarbons, which can significantly reduce the cost of hydrogen production. However, most current in-situ hydrogen production technologies in reservoirs inject air into coal reservoirs, heavy oil reservoirs or abandoned oil reservoirs to ignite, i.e., using the in-situ combustion gasification (ISCG) method to produce hydrogen. Although technical and economic assessment (TEA) shows that the cost of the ISCG method can be significantly reduced under different experimental assumptions. However, even underground, the process of using the in-situ combustion gasification (ISCG) method to produce hydrogen inevitably produces a large amount of CO2 due to the injection of air.

[0004] Chinese patent 202311482466.5 discloses a method suitable for in-situ hydrogen production in oil reservoirs, which discloses an in-situ hydrogen production method of setting three horizontal wells and one temperature detection well in the same reservoir, wherein the middle horizontal well is provided with a heating device, the surrounding of the well is subjected to close cutting volume fracturing and filled with catalyst and heat-conducting agent to form a reaction zone; the lower horizontal well is subjected to in-situ ignition and injection of oxygen-containing gas to make it incomplete combustion to produce CO and CO2 and form a gasification zone; the heating device is used to heat to above 450℃, and when the gas in the gasification zone enters the reaction zone, water vapor is injected for efficient hydrogen production; however, this method has the following disadvantages: (1) this technology needs to drill four horizontal wells, and the economic benefit is poor; (2) its essence is still oxygen injection combustion to heat the reservoir, which cannot avoid the generation of CO2 gas, although it can avoid its exploitation to the ground through a hydrogen filtration membrane, but it cannot realize the utilization of CO2; (3) the reservoir ignition combustion has high requirements for organic matter, and it is not universal for oil reservoirs.

[0005] Chinese patent 202210955852.0 discloses a method for in-situ hydrogen production in the near-wellbore zone by using downhole electric heating, which heats the near-wellbore zone reservoir by setting electric heating devices and temperature monitoring devices downhole, and the natural gas in the reservoir mixes with the in-situ generated water vapor in the near-wellbore zone of the production well under high temperature conditions, and the hydrogen production reaction occurs under the action of the nanometer catalyst on the rock surface, producing hydrogen and other component outputs mainly composed of carbon dioxide, and finally separating the hydrogen and other components and injecting the other components into the formation through the adjacent injection well, but this method has the following disadvantages: (1) the method is still essentially organic matter and water vapor heating decomposition, which cannot avoid the generation of CO2 gas, and this technology cannot realize the in-situ storage of CO2 and other associated gases through a filtration membrane, even if it is injected back, it increases the cost, and it cannot realize the utilization of CO2.

[0006] (2) The technical method completely heats the reservoir by underground electric heating, which has high cost.

[0007] In view of the above problems, a hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production method is proposed. SUMMARY

[0008] The purpose of the present application is to solve the problem of CO2 gas generated by in-situ hydrogen production by oxygen injection combustion in the reservoir.

[0009] The existing method cannot avoid the generation of CO2 gas, and cannot realize the in-situ storage of CO2 and other associated gases through a filter membrane. In view of the above problems, a hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production method is provided, which discards the conventional organic matter + steam thermal cracking hydrogen production technology, and adopts electromagnetic heating technology to avoid the generation of by-products such as CO2, and at the same time, on the basis of conventional electric / electromagnetic heating, a reservoir preheating step of high-temperature CO2 injection is added, which not only saves the cost of electromagnetic heating, but also can store CO2 underground, and finally realizes the dual purpose of CO2 geological storage and in-situ hydrogen production in the reservoir. The present application breaks through the conventional oxygen injection combustion heating method, avoids the output of CO2 gas in the hydrogen production process, and simplifies the multiple injection process of oxygen-containing gas, steam and the like; the present application adopts the method of injecting high-temperature CO2 to preheat the reservoir to reduce the cost of electromagnetic heating, and at the same time, realizes the utilization and geological storage of CO2, thereby ensuring the synergistic effect of CO2 geological storage and in-situ hydrogen production.

[0010] The present application is implemented in the following manner: a hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production method, which comprises the following steps: S10, selecting a reservoir: selecting a target reservoir, which contains at least two horizontal wells; S20, well arrangement: drilling and arranging hydrogen production and production equipment, drilling two horizontal wells in the target reservoir, the upper horizontal well serving as an electromagnetic heating hydrogen production and production well, and the lower horizontal well serving as a high-temperature CO2 injection well; S30, fracturing and development: modifying and developing the target reservoir based on the type of the target reservoir; S40, injecting high-temperature CO2: heating the high-temperature CO2 on the ground and making it in a supercritical state, and then injecting the high-temperature CO2 into the target reservoir through a ground injection device; S50, electromagnetic heating hydrogen production: opening the microwave emission device of the electromagnetic heating hydrogen production and production well to continue heating the reservoir to a hydrogen production temperature and maintaining the current reservoir temperature and pressure conditions to produce hydrogen; S60, opening the electromagnetic heating hydrogen production and production well for production: shutting down and stopping production when the hydrogen production rapidly decreases; and S70, repeating the steps S10-S60 until no industrial hydrogen flow is generated.

[0011] The target reservoir type includes oil shale, tight reservoir, heavy oil reservoir, conventional sandstone reservoir and carbonate rock reservoir; the effective thickness of the target reservoir is greater than 5 m, and the burial depth of the target reservoir is less than 6000 m.

[0012] In S20, the electromagnetic heating hydrogen production and production well is provided with a microwave emission device in the horizontal section, the microwave emission device is used for electromagnetic heating of the reservoir to an organic matter hydrogen production temperature, the heating radius of the microwave emission device is 1.2-4 m, and the electromagnetic heating hydrogen production and production well is provided with a hydrogen filter membrane, which is used for filtering other gas products to obtain pure hydrogen.

[0013] The method for reforming and developing the target reservoir based on the target reservoir type comprises the following steps: S301, identifying and judging the target reservoir type; S302, if the target reservoir is a low-permeability tight reservoir or a shale reservoir, supercritical high-temperature CO2 is used for reservoir fracturing of the target reservoir; and S303, if the reservoir is an undeveloped reservoir or a reservoir with exploitation potential, oil and gas development is performed after the horizontal well of the target reservoir is drilled, and S302 is performed after the reservoir development is completed.

[0014] When the high-temperature CO2 is heated on the ground and is in a supercritical state, the heating temperature of the CO2 is higher than 280 DEG C, and the heating pressure is 20 MPa.

[0015] In S50, after the well is closed for heat transfer in S40, the microwave emission device of the electromagnetic heating hydrogen production well is started, the microwave emission device continues to heat the reservoir to a hydrogen generation temperature in the form of electromagnetic waves, and maintains the current reservoir temperature and pressure conditions to perform the organic matter electromagnetic heating thermal cracking hydrogen reaction.

[0016] In S50, before the organic matter electromagnetic heating thermal cracking hydrogen reaction, a catalyst is injected into the reservoir in advance to increase the hydrogen reaction rate, and the catalyst comprises iron ions and SiC.

[0017] When the microwave emission device continues to heat the reservoir to a hydrogen generation temperature in the form of electromagnetic waves, the hydrogen generation temperature is 300-600 DEG C.

[0018] Compared with the prior art, the embodiment of the present application has the following beneficial effects: The present application discards the conventional organic matter + steam thermal cracking hydrogen generation technology, adopts the electromagnetic heating technology to avoid the generation of by-products such as CO2, increases the high-temperature CO2 injection reservoir preheating step on the basis of conventional electric / electromagnetic heating, saves the electromagnetic heating cost, and can store CO2 underground, finally realizes the dual purpose of CO2 geological storage and in-situ hydrogen production.

[0019] The present application avoids the generation of CO2 gas in the hydrogen production process, and simplifies the multiple injection process of oxygen-containing gas and steam; the present application adopts the method of injecting high-temperature CO2 to preheat the reservoir to reduce the cost of electromagnetic heating, and can realize the utilization and geological storage of CO2, thereby ensuring the synergistic effect of CO2 geological storage and in-situ hydrogen production. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the method steps of the in-situ carbon storage and hydrogen production synergy method of the present application.

[0021] Figure 2 It is a schematic diagram of the organic matter electromagnetic heating thermal cracking hydrogen reaction of the present application.

[0022] Figure 3It is a whole process temperature and hydrogen production variation curve schematic diagram provided by the present application.

[0023] Figure 4 It is an implementation process schematic diagram of the in-situ carbon storage and hydrogen production collaborative method of the hot CO2 assisted electromagnetic heating provided by the present application.

[0024] In the figure: 1-high temperature CO2 injection well, 2-target reservoir, 3-microwave emission device, 4-hydrogen gas filter membrane, 5-electromagnetic heating hydrogen production well. DETAILED DESCRIPTION

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting of the application; the description and the claims herein and the above description of drawings utilize terms such as "including" and "having" and variations thereof that are intended to be broad enough to encompass the presence of zero or more of the specified elements or steps without limitation; the terms "first", "second", and the like used in the description and the claims herein are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

[0026] The existing method cannot avoid the generation of CO2 gas, and cannot realize the in-situ storage of CO2 and associated gases such as CO2 through a filter membrane; in view of the above problems, we propose a hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production collaborative method, which discards the conventional organic matter + water vapor thermal cracking hydrogen production technology, and uses electromagnetic heating technology to avoid the generation of by-products such as CO2, and at the same time increases the high-temperature CO2 injection reservoir preheating step on the basis of conventional electric / electromagnetic heating, which not only saves the cost of electromagnetic heating, but also can store CO2 underground, and finally realizes the dual purpose of CO2 geological storage and in-situ hydrogen production. The present application breaks through the conventional oxygen injection combustion heating method, avoids the generation of CO2 gas in the hydrogen production process, and simplifies the multiple injection process of oxygen-containing gas, water vapor and the like; the present application uses the method of injecting high-temperature CO2 to preheat the reservoir to reduce the cost of electromagnetic heating, and at the same time realizes the utilization and geological storage of CO2, thereby ensuring the collaborative effect of CO2 geological storage and in-situ hydrogen production.

[0027] It should be noted that the embodiments of the present application are applicable to any conventional, unconventional oil and gas and coal reservoirs such as conventional sandstone reservoirs, oil shale reservoirs, heavy oil reservoirs, etc. Some reservoirs with poor pore connectivity need to be pre-fractured.

[0028] The embodiments of the present application provide a hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production collaborative method, Figure 1A schematic diagram of the steps of the in-situ carbon storage and hydrogen production method assisted by hot CO2 and electromagnetic heating is shown, and the in-situ carbon storage and hydrogen production method assisted by hot CO2 and electromagnetic heating specifically comprises: S10, selecting a reservoir: selecting a target reservoir 2, which contains at least two horizontal wells; in this embodiment, the reservoir type of the target reservoir 2 can be any type of reservoir, thereby expanding the applicability of the embodiment of the present application, and the target reservoir 2 type includes but is not limited to oil shale, tight reservoir, heavy oil reservoir, conventional sandstone reservoir, carbonate rock reservoir; such as oil shale (which has a natural mineral catalyst and is more prone to thermal cracking), tight reservoir, heavy oil reservoir (sufficient high-carbon organic matter), conventional sandstone reservoir (large gas storage space), carbonate rock reservoir (injected high-temperature CO2 will inhibit the high-temperature decomposition of carbonate rock, which will reduce the generation of CO2 on the one hand, but will also affect the increase of porosity). The effective thickness of the target reservoir 2 is greater than 5m, and the burial depth of the target reservoir 2 is less than 6000m.

[0029] S20, well arrangement: drilling and arranging hydrogen production equipment, drilling two horizontal wells in the target reservoir 2, the upper horizontal well as the electromagnetic heating hydrogen production well 5, and the lower horizontal well as the high-temperature CO2 injection well 1; in this embodiment, the electromagnetic heating hydrogen production well 5 is provided with a microwave emitting device 3 in the horizontal section, the microwave emitting device 3 is used for heating the reservoir to the organic matter hydrogen generation temperature, the heating radius of the microwave emitting device 3 is 1.2-4m, and the hydrogen production well 5 is provided with a hydrogen filter membrane 4, which is used for filtering other gas products to obtain pure hydrogen.

[0030] It should be noted that the arrangement of the microwave emitting device 3 in the oil and gas field development field belongs to a successfully applied technology, and the heating radius can reach 1.2-4m, which can meet the heating range requirement. The hydrogen filter membrane 4 is a prior art and has been involved in the existing oxygen injection combustion reservoir in-situ hydrogen production technology, which is a mature technology.

[0031] S30, fracturing and development: reservoir reconstruction and development based on the type of the target reservoir 2; in this embodiment, the method for reservoir reconstruction and development based on the type of the target reservoir 2 comprises: S301, identifying and judging the type of the target reservoir 2; S302, if the target reservoir 2 is a low-permeability tight reservoir or a shale reservoir, supercritical high-temperature CO2 is used for reservoir fracturing; S303, if the reservoir is an undeveloped reservoir or a reservoir with exploitation potential, oil and gas development (including but not limited to CO2 flooding, heavy oil thermal recovery and cold recovery, chemical flooding, etc.) is carried out after the horizontal well drilling of the target reservoir 2, and S302 is carried out after the end of the reservoir development (which can be identified as a depleted oil and gas reservoir).

[0032] It should be noted that, since the target reservoir 2 of the present application has universality, it is necessary to carry out reservoir reconstruction and development according to the actual situation of the reservoir before hydrogen production to ensure the best economic benefit. If the target reservoir 2 is a low-permeability tight reservoir or a shale reservoir, if the reservoir has not been fractured or the reservoir has poor pore connectivity, it is necessary to carry out reservoir fracturing. Considering the needs of carbon storage and preheating of the reservoir, supercritical high-temperature CO2 can be used for reservoir fracturing (the present application is not limited to this fracturing method, and all fracturing methods that can achieve reservoir fracture can be effectively applied, which are within the scope of patent protection).

[0033] S40, inject high-temperature CO2, heat the high-temperature CO2 on the ground and make it in a supercritical state, and inject the high-temperature CO2 into the target reservoir 2 through the high-temperature CO2 injection well 1 through the ground injection device; it should be noted that when the high-temperature CO2 is heated on the ground and made in a supercritical state, the heating temperature of CO2 is more than 280℃, the heating pressure is 20MPa, the heating temperature needs to be more than 280℃, the shale reservoir has a "thermal runaway" phenomenon, and the ability to continue heating it to the hydrogen generation temperature is significantly reduced after more than 280℃. There is no "thermal runaway" report for gas type reservoirs, but this can be used as the standard for CO2 heating temperature. The high-temperature CO2 is injected into the reservoir through the injection well 1 through the ground injection device and the well is closed. The injected high-temperature CO2 will enter the reservoir depletion area after oil and gas production and achieve the effect of preheating the reservoir, and the injected CO2 will be sealed in the reservoir.

[0034] S50, electromagnetic heating hydrogen production: turn on the microwave emission device 3 of the electromagnetic heating hydrogen production and hydrogen production well 5 to continue heating the reservoir to the hydrogen generation temperature and keep the current reservoir temperature and pressure conditions for hydrogen generation; in this embodiment, after S40, the electromagnetic heating hydrogen production and hydrogen production well 5 is opened, the microwave emission device 3 continues to heat the reservoir to the hydrogen generation temperature in the form of electromagnetic waves, and keeps the current reservoir temperature and pressure conditions for organic matter electromagnetic heating thermal cracking hydrogen reaction. Before the organic matter electromagnetic heating thermal cracking hydrogen reaction, a catalyst is injected into the reservoir in advance to increase the hydrogen reaction rate. The catalyst includes iron ions and SiC. The catalyst is a solid powder and can be added to the fracturing fluid and injected into the reservoir. If fracturing is not needed, it can be carried to the reservoir by the injection fluid in the development stage (the effect of this method will be poorer because the displacement and pressure of fracturing are large and the carrying effect is good). The injection amount is generally 5-10kg per square meter of water. The organic matter electromagnetic heating thermal cracking hydrogen reaction schematic diagram is as follows: Figure 2As shown, the reaction equation is as follows, and indoor experiments show that the concentration of hydrogen can account for more than 60%: organic matter → light oil (l) + C (s) + H2(g) + CO (g) Unlike in-situ hydrogen production by oxygen injection combustion reservoir, this reaction does not produce CO2, which on the one hand reduces the processing cost of hydrogen by-product, and on the other hand does not inhibit the normal occurrence of the reaction due to the injection of high-temperature CO2, and is more green and environmentally friendly.

[0035] When the microwave emitting device 3 continues to heat the reservoir to the hydrogen production temperature in the form of electromagnetic waves, the hydrogen production temperature can be 300-600℃ (the sandstone reservoir is generally about 500℃, and the shale reservoir is generally about 300℃).

[0036] It should be noted that the microwave emitting device 3 can be an electromagnetic wave generator, which is provided with an electromagnetic wave generator inside, and is transmitted to the simulation reaction chamber through an electromagnetic wave guide. The electromagnetic wave generator includes a magnetron and a solid generator. The solid generator is an upgraded version with higher power and frequency, but in the application background of electromagnetic wave heating in this patent, it does not need too high frequency, and the magnetron is more mature for microwave heating (such as microwave oven). The working frequency of the microwave generator is 3-5GHz, and the maximum power is not less than 3kW. Specifically, the magnetron has a cathode and a filament inside. The filament heats the cathode to make it emit electrons. These electrons accelerate to the anode under the action of the electric field. At the same time, the constant magnetic field generated by the magnet makes the trajectory of the electrons curve, forming a rotating motion. The rotating electron current excites the coupled cavity chain to generate a high-frequency alternating electromagnetic field in the microwave frequency band. The high-frequency alternating field further interacts with the electrons, slowing them down and converting their kinetic energy into microwave energy.

[0037] S60, start electromagnetic heating hydrogen production and hydrogen production well 5 production: shut down when the hydrogen production rapidly decreases; it should be noted that starting electromagnetic heating hydrogen production and hydrogen production well 5 production can make the hydrogen purity of the product higher due to the existence of hydrogen filter membrane 4, and avoid the injection of CO2 gas to the ground again. Shut down when the hydrogen production rapidly decreases, the temperature and hydrogen production of the whole process of steps S40-S60 are shown in the temperature and hydrogen production curve diagram as shown in the figure. Figure 3

[0038] S70, repeat steps S10-S60 until no industrial hydrogen flow is produced.

[0039] In this embodiment, Figure 3 ​The display hydrogen production rate will appear peak in the heating process and gradually decrease, because of the problem of thermal cracking chemical reaction limit, so it is necessary to heat cracking hydrogen production after opening well, that is, repeating the above steps S40-S60 until no industrial hydrogen flow is generated or according to economic benefits, the beneficial effect of repeating the above steps is that more CO2 can be stored. Figure 4 As shown in the figure, a flow chart of the in-situ carbon storage and hydrogen production method provided by the embodiment of the application is shown.

[0040] At the same time, it should be noted that the application can be linked with wind power and other new energy sources, and rely on wind power and other power sources to heat CO2, avoiding the storage and transportation of wind power, and being more economical and environmentally friendly.

[0041] In this embodiment, the target reservoir 2 is an undeveloped shale reservoir, and the implementation steps are as follows: S10, design of construction scheme, the effective thickness of the target reservoir 2 is 10 m, including shale and dense sandstone interbeds, the burial depth is about 4500 m, the reservoir temperature is about 80℃, the horizontal section of the horizontal well is set to 400 m, and the perforation completion is performed, and the staged volume fracturing reconstruction is needed in the later period.

[0042] S20, drilling and arranging corresponding process flow, drilling two horizontal wells parallel to each other in the target reservoir 2, wherein the lower well is used as the high-temperature CO2 injection well 1, and the upper well is used as the electromagnetic heating hydrogen production well 5, the electromagnetic heating hydrogen production well 5 is provided with a microwave emitting device 3 in the horizontal section for electromagnetic heating of the reservoir to the organic matter hydrogen production temperature, and is provided with a hydrogen filter membrane 4 for filtering other gas products to obtain pure hydrogen, it should be noted that the hydrogen filter membrane 4 is generally arranged in stages.

[0043] S30, pre-stage reservoir reconstruction and development. In the two horizontal wells, supercritical high-temperature CO2 is used for reservoir fracturing and proppant laying, and industrial oil and gas flow is obtained through depletion production, CO2 huff and puff and CO2 flooding development methods, and the subsequent steps are implemented after the end of oil reservoir development.

[0044] S40, injecting high-temperature CO2 to preheat the reservoir, the upper horizontal well is in the closed state, the supercritical CO2 gas is heated to 300℃, 20MPa on the ground (using the "thermal runaway" phenomenon of shale reservoir), the high-temperature CO2 is injected into the reservoir through the lower high-temperature CO2 injection well 1 through the ground injection device and closed, the injected high-temperature CO2 will enter the reservoir void area after oil and gas production and achieve the effect of preheating the reservoir, and the injected CO2 will be stored in the reservoir.

[0045] S50, electromagnetic heating reservoir hydrogen production, after S40, heat for 2 hours, open electromagnetic heating hydrogen production and hydrogen production well 5 microwave emission device 3 through the form of electromagnetic wave continues to heat the reservoir to 500℃, and keep the current reservoir temperature and pressure conditions hydrogen production reaction 2-3 hours.

[0046] S60, hydrogen development, open hydrogen production well production, hydrogen gas filter membrane 4 can obtain high purity hydrogen, while avoiding the injection of CO2 gas recovers to the ground, when the hydrogen production rapidly decline shut-in production.

[0047] S70, repeat the above steps S40-S60 until no industrial hydrogen flow is produced or according to economic benefits.

[0048] In this embodiment, the target reservoir 2 is a low permeability sandstone reservoir developed by horizontal well, which realizes the steps as follows: S10, construction scheme design, the effective thickness of the target reservoir 2 is 8m, containing 1 sandstone layer, the burial depth is about 3000m, the reservoir temperature is about 50℃, the horizontal section of the horizontal well is set to 400m, the perforation completion is carried out, and the staged volume fracturing reconstruction is needed in the later period.

[0049] S20, drilling and arranging corresponding process flow, drilling a parallel horizontal well above the existing production well of the target reservoir 2 as electromagnetic heating hydrogen production and hydrogen production well 5, the original production well below as high temperature CO2 injection well 1, the electromagnetic heating hydrogen production and hydrogen production well 5 is laid with microwave emission device 3 for electromagnetic heating reservoir to organic matter hydrogen production temperature, and hydrogen gas filter membrane 4 is arranged for filtering other gas products to obtain pure hydrogen.

[0050] S30, early reservoir reconstruction and development, using supercritical high temperature CO2 to carry out reservoir fracturing and lay proppant in the two horizontal wells, experiencing CO2 huff and puff and CO2 flooding and other development methods to obtain industrial oil and gas flow, after the end of oil reservoir development, the subsequent steps are implemented, and iron ions are added to the liquid injected into the reservoir to increase the hydrogen reaction rate during the reservoir fracturing and development.

[0051] S40, inject high temperature CO2 to preheat the reservoir, the upper horizontal well is in the shut-in state, the supercritical CO2 gas is heated to 300℃, 20MPa on the ground, the high temperature CO2 is injected into the reservoir through the high temperature CO2 injection well 1 below through the ground injection device and shut-in, the injected high temperature CO2 will enter the reservoir void area after oil and gas exploitation and achieve the effect of preheating the reservoir, and the injected CO2 will be sealed in the reservoir.

[0052] S50, electromagnetic heating reservoir hydrogen production, after step S40, heat soak 2 hours, open electromagnetic heating hydrogen production and hydrogen production well 5 microwave emission device 3 by electromagnetic wave form continues to heat the reservoir to 600 DEG C, and keep the current reservoir temperature and pressure conditions hydrogen production reaction 2-3 hours.

[0053] S60, hydrogen development, open hydrogen production well production, hydrogen gas filter membrane 4 can obtain high purity hydrogen, while avoiding the injection of CO2 gas recovers to the ground. When the hydrogen production rapidly declines, shut down production.

[0054] S70, repeat the above steps S40-S60 until no industrial hydrogen flow is generated or according to economic benefits.

[0055] In summary, the present application provides a kind of hot CO2 assisted electromagnetic heating in-situ carbon storage and hydrogen production collaborative method, the present application breaks through the conventional oxygen injection combustion heating mode, avoids the output of CO2 gas in hydrogen production process, simultaneously simplifies the multiple injection process of oxygen-containing gas, water vapor etc.;The present application uses the mode of injecting high-temperature CO2 to preheat reservoir to reduce the cost of electromagnetic heating, and can realize the utilization and geological sequestration of CO2, so as to ensure the synergistic effect of CO2 geological sequestration and in-situ hydrogen production.

[0056] The present application discards the conventional organic matter + water vapor thermal cracking hydrogen production technology, adopts electromagnetic heating technology to avoid the generation of by-products CO2 etc., and increases the reservoir preheating step of high-temperature CO2 injection on the basis of conventional electric / electromagnetic heating, which not only saves the cost of electromagnetic heating, but also can store CO2 underground, finally realizes the dual purpose of CO2 geological sequestration and in-situ hydrogen production in reservoir.

[0057] It should be noted that for the foregoing embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0058] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Obviously, the described examples are only some of the embodiments of the present application, but not all the embodiments. Based on these examples, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application. Although the present application is described in detail with reference to the above examples, those of ordinary skill in the art can still combine, add or delete the features in the embodiments of the present application according to the circumstances without creative work, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence, and these technical solutions also fall within the scope of the present application.

Claims

1. A method of in-situ carbon storage and hydrogen production by thermal CO2 assisted electromagnetic heating, characterized in that, The method comprises the following steps of: S10, selecting a reservoir: selecting a target reservoir, which contains at least two horizontal wells; S20, well arrangement: drilling wells and arranging hydrogen production equipment, drilling two horizontal wells in the target reservoir, the upper horizontal well is used as an electromagnetic heating hydrogen production well, and the lower horizontal well is used as a high-temperature CO2 injection well, and the electromagnetic heating hydrogen production well is provided with a microwave emission device; In S20, the microwave emission device is used to heat the reservoir to the organic matter hydrogen generation temperature, the heating radius of the microwave emission device is 1.2-4 m, a hydrogen filter membrane is arranged in the electromagnetic heating hydrogen production well, and the hydrogen filter membrane is used to filter other gas products to obtain pure hydrogen; S30, fracturing and development: based on the type of the target reservoir, the target reservoir is reconstructed and developed; S40, injecting high-temperature CO2: heating the high-temperature CO2 on the ground to make it in a supercritical state, and injecting the high-temperature CO2 into the target reservoir through the ground injection device and the high-temperature CO2 injection well; S50, electromagnetic heating hydrogen production: turning on the microwave emission device of the electromagnetic heating hydrogen production well to continue heating the reservoir to the hydrogen generation temperature and keeping the current reservoir temperature and pressure conditions for hydrogen generation, in S50, after the well is closed for heat transfer in S40, the microwave emission device of the electromagnetic heating hydrogen production well is turned on, the microwave emission device continues to heat the reservoir to the hydrogen generation temperature in the form of electromagnetic waves, and the current reservoir temperature and pressure conditions are kept for the organic matter electromagnetic heating thermal cracking hydrogen reaction, before the organic matter electromagnetic heating thermal cracking hydrogen reaction, a catalyst is injected into the reservoir in advance to increase the hydrogen reaction rate, the catalyst includes iron ions and SiC, when the microwave emission device continues to heat the reservoir to the hydrogen generation temperature in the form of electromagnetic waves, the hydrogen generation temperature is 200-600 DEG C, the microwave emission device is provided with an electromagnetic wave generator, the electromagnetic wave is transmitted into an analog reaction chamber through an electromagnetic wave guide, the working frequency of the microwave generator is 3-5 GHz, the maximum power is not less than 3 kW, the magnetron has a cathode and a filament inside, the filament heats the cathode to make it emit electrons, and the electrons move to the anode under the action of an electric field; The reaction equation of the organic matter electromagnetic heating thermal cracking hydrogen is as follows: Organic matter→light oil (l)+C (s)+H2 (g)+CO (g); S60, opening the electromagnetic heating hydrogen production well for production: closing the well and stopping production when the hydrogen production rate rapidly decreases; S70, repeating the steps of S10-S60 until no industrial hydrogen flow is generated.

2. The thermal CO2 assisted electromagnetic heating in-situ carbon reservoir and hydrogen production co-method of claim 1, wherein: The target reservoir type includes oil shale, tight reservoir, heavy oil reservoir, conventional sandstone reservoir and carbonate rock reservoir. The effective thickness of the target reservoir is greater than 5 m, and the burial depth of the target reservoir is less than 6000 m.

3. The thermal CO2 assisted electromagnetic heating in-situ carbon reservoir and hydrogen production co-method of claim 2, wherein: The method for reconstructing and developing the target reservoir based on the type of the target reservoir comprises the following steps of: S301, identifying and judging the type of the target reservoir; S302, if the target reservoir is a low-permeability tight reservoir or a shale reservoir, supercritical high-temperature CO2 is used for reservoir fracturing. S303, if the oil reservoir is an undeveloped oil reservoir or an oil reservoir with exploitation potential, first carry out oil and gas development after the target reservoir horizontal well is drilled, and then carry out S302 after the oil reservoir development is completed.

4. The thermal CO2-assisted electromagnetic heating in-situ carbon reservoir and hydrogen production co-method of claim 3, wherein: The high-temperature CO2 is heated on the ground and is in a supercritical state, in order to ensure safety, the heating temperature of the CO2 is not more than 350 DEG C, and the heating pressure is not more than the reservoir fracture pressure or 50 MPa.

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