59 results about "Underground hydrogen storage" patented technology

The invention belongs to the technical field of underground hydrogen storage, and particularly relates to a method for improving underground hydrogen storage capacity by stabilizing hydrogen foam through a porous carbon material, which comprises the following steps: step 1, preparing a hydrophobic modified porous carbon material: preparing the porous carbon material by using biomass waste as a raw material through a carbonization-activation process; carrying out hydrophobic modification treatment on the porous carbon material to enable the water contact angle of the material to reach more than 90 degrees; step 2, preparing a surfactant solution; step 3, preparing a porous carbon-surfactant composite system; and fourthly, hydrogen foam is generated and injected, wherein hydrogen and the porous carbon-surfactant composite system are fully mixed according to the gas-liquid volume ratio of 1: 1-10: 1, and then the mixture is injected into the stratum. By means of the method, the stability of hydrogen foam can be remarkably improved, the hydrogen storage efficiency and the hydrogen recovery rate are improved, and therefore the underground hydrogen storage amount is greatly increased.

Hydrocarbon extraction may be coupled with subterranean hydrogen storage. For example, a method of hydrocarbon extraction and hydrogen storage may include: introducing carbon dioxide into a subterranean formation via one or more injection wells, the subterranean formation containing hydrocarbons and optionally water; mobilizing at least a portion of the hydrocarbons in a hydrocarbon-bearing zone of the subterranean formation with the carbon dioxide; after mobilization with the carbon dioxide, producing the hydrocarbons from the hydrocarbon-bearing zone of the subterranean formation via one or more production wells; introducing hydrogen to the subterranean formation via the one or more injection wells, the hydrogen displacing the carbon dioxide downward in the subterranean formation; storing the hydrogen in the subterranean formation above the carbon dioxide; and producing at least a portion of the hydrogen from the subterranean formation via the one or more production wells, the one or more injection wells, or any combination thereof.

The invention relates to the technical field of hydrogen energy storage, in particular to an underground hydrogen storage system, which is characterized in that a hydrogen storage sensing module and a processing module are integrated in the system, a multi-input multi-output monitoring channel is constructed by using array type electrode nodes, and the processing module constructs a dual-drive prediction model through superposition of a physical state space and a neural network to obtain reference hybrid prediction output; generating a virtual sample set by using random sampling to construct a dynamic random tolerance envelope band; and finally, leakage is judged according to the permeability of the envelope band according to the actually measured signal. According to the invention, the problem of high false alarm rate of the system due to the fact that in-pipe nonlinear background triboelectric charge noise covers tiny leakage characteristics under a fluctuating power supply charging working condition is effectively solved; millisecond-level self-adaptive accurate diagnosis of the air tightness of the pipeline in a complex dynamic environment is realized, and the detection capability of weak leakage signals is remarkably improved while electromagnetic interference is filtered out.

The invention relates to a high-pressure hydrogen nano-pore permeability testing device and method based on double-chamber pressure balance, and belongs to the technical field of unconventional oil gas. The device comprises a high-pressure gas source, a pressurization module, a double-layer nested core reaction kettle module and a high-frequency data acquisition and safety monitoring module; by constructing a double-layer nested structure that inner cavity hydrogen is actively wrapped by outer cavity nitrogen and cooperating with an all-metal knife edge hard sealing device and a different flow pattern permeability calculation method, accurate measurement of the Ndarcy grade permeability of the compact cover rock is successfully achieved, the industrial pain point that a traditional device is inaccurate in measurement, unstable in measurement and unsafe is thoroughly solved, and the method is suitable for large-scale popularization and application. And key experimental technology guarantee and scientific data support are provided for closure evaluation of underground hydrogen storage engineering and exploration and development of natural hydrogen resources.

The invention provides a bacteriostatic proppant technology based on a palladium oxide-reduced graphene oxide composite material, aiming at the problem of hydrogen loss caused by microbial activity in a hydrogen storage bank of an exhausted gas reservoir. A PdO (at) rGO composite material functionally modified by lead ions (Pb < 2 + >) is loaded on the surface of a porous ceramsite carrier to form an adsorption-inactivation-blocking synergistic antibacterial network; precise laying of the proppant in a crack network is achieved through the end sand removal technology, hydrogen consumption is reduced, and an efficient, economical and environment-compatible innovative solution is provided for biological pollution control of the underground hydrogen storage library.

The invention discloses a closed mine in-situ electrolytic hydrogen production-underground energy storage-blast power generation integrated method, which comprises the following steps: firstly, building a mine water underground reservoir in a closed mine, carrying out deep treatment on mine water, and finally, continuously converting the mine water into hydrogen by adopting an electrolytic hydrogen production mode to realize in-situ electrolytic hydrogen production of the mine water. Then a roadway of the closed mine is transformed to form an underground hydrogen storage space used for storing prepared hydrogen; when stable power supply is needed, the hydrogen is conveyed to the explosion engine and combined with the pulverized coal, and pulverized coal-hydrogen mixed explosion power generation is carried out; and products generated after explosion power generation are collected, and resources are recycled after the products are classified. According to the system, mine water resources, closed mine underground space resources and surplus wind and light power are matched with one another, electric energy is converted and stored when being surplus and is released and supplemented in time when needing to be supplemented, and therefore it is guaranteed that electric energy is stably supplied under various weather conditions while waste resources are effectively utilized.

Hydrocarbon extraction may be coupled with subterranean hydrogen storage. For example, a method of hydrocarbon extraction and hydrogen storage may include: introducing carbon dioxide into a subterranean formation via one or more injection wells, the subterranean formation containing hydrocarbons and optionally water; mobilizing at least a portion of the hydrocarbons in a hydrocarbon- bearing zone of the subterranean formation with the carbon dioxide; after mobilization with the carbon dioxide, producing the hydrocarbons from the hydrocarbon-bearing zone of the subterranean formation via one or more production wells; introducing hydrogen to the subterranean formation via the one or more injection wells, the hydrogen displacing the carbon dioxide downward in the subterranean formation; storing the hydrogen in the subterranean formation above the carbon dioxide; and producing at least a portion of the hydrogen from the subterranean formation via the one or more production wells, the one or more injection wells, or any combination thereof.

The invention discloses an underground tunnel type hydrogen storage library structure and a construction method, and relates to the technical field of underground hydrogen storage libraries, the underground tunnel type hydrogen storage library structure comprises a steel lining, a supporting layer and a supporting adjusting assembly, and the supporting layer covers the outer side of the steel lining; the supporting adjusting assembly comprises a displacement meter and an adjusting mechanism, the adjusting mechanism comprises a fixed cylinder and a sliding part, the displacement meter and the fixed cylinder are both arranged on the surrounding rock layer, and the sliding part is arranged on the fixed cylinder in a sliding mode and abuts against the outer side of the supporting layer; the sliding piece can slide close to or away from the supporting layer according to the rock surrounding layer offset measured by the displacement measuring meter. When the surrounding rock layer deviates due to landslide and other reasons, the displacement meter can measure the deviation amount of the surrounding rock layer and send a sensing signal to the hydraulic part, so that the hydraulic part controls the sliding part to be close to or away from the supporting layer according to the deviation amount, supporting compensation of the supporting layer and adaptive adjustment of supporting stress of the steel lining are achieved, and the supporting effect of the supporting layer is improved. Collapse of the hydrogen storage reservoir is prevented.

A method for subsurface hydrogen storage and hydrogen retrieval. The method includes identifying a subsurface formation [30] (step 100). The method further includes selecting a liquid organic hydrogen carrier (LOHC) feed [10] compatible with the subsurface formation [30] (step 110). The LOHC feed [10] includes a mixture of one or more completely or partially hydrogenated LOHCs. The LOHC feed [10] is injected into the subsurface formation [30] (step 120) for storage (step 130). Later, when needed, the LOHCs are recovered from storage [13] (step 140), optionally separating a recovered water / brine phase [15] and off gas [16] from the LOHCs from storage [13 / 14] in a separator [21] configured to produce a stream of recovered LOHCs [13] (step 150). The recovered LOHC [13] is then dehydrogenated to form a H2 product [17] and dehydrogenated LOHCs [18] in a dehydrogenation unit [22] process (steps 180 and 190).

The invention discloses a method for determining a hydrogen and water relative permeability curve of an underground hydrogen storage and related equipment, and relates to the field of underground space engineering.The method comprises the steps that a microscopic computed tomography image of a rock sample in the hydrogen flooding process is obtained; performing characterization unit analysis on the pore structure of the microscopic computed tomography image to construct a first pore structured grid model, the first pore structured grid model being used for characterizing the pore structure of the rock sample, and the first pore structured grid model comprising a coordinate system of the pore structure; by taking a coordinate system of the first pore structured grid model as a reference, mapping the wettability distribution data to the first pore structured grid model through the corresponding coordinate position to obtain a second pore structured grid model, the wettability distribution data is calculated along a three-phase contact line of rock, hydrogen and water extracted from the microscopic computed tomography image; and performing water-driven hydrogen two-phase flow simulation operation on the second pore structured grid model to obtain a hydrogen and water relative permeability curve of the hydrogen storage bank.

The invention relates to the technical field of underground hydrogen storage, and discloses an underground hydrogen storage prediction method coupled with a chemical reaction. The method comprises the following steps: determining the hydrogen leakage flux of the underground hydrogen storage according to reservoir information of the underground hydrogen storage based on the Darcy law; according to three-phase substances including mineral composition, solution composition and gas composition of the underground hydrogen storage, a physical model containing a mineral-fluid-gas storage three-phase substance equilibrium relation of the underground hydrogen storage is established by utilizing the law of conservation of substances; according to the dissolution trends of different minerals in the underground hydrogen storage under the hydrogen-fluid-rock chemical reaction system, a dissolution kinetic model of the different minerals is established; and according to the hydrogen leakage flux, the coupling physical model and the dissolution kinetic model, obtaining the change conditions of mineral composition, solution composition and gas composition in the underground hydrogen storage library caused by hydrogen-fluid-rock chemical reaction under the hydrogen leakage flux, so as to predict the hydrogen storage condition of the underground hydrogen storage library.

The invention discloses a defect detecting and coating robot for an underground hydrogen storage shaft. The robot is composed of an anchoring walking device, a feeding device, a coating device, a visual monitoring device, a take-up and pay-off device and a remote control operation table. The roller type coating device is adopted, and the auger disc stirring rod is adopted for stirring and feeding, so that the problems that the thickness of a coating at the connection damage position of a shaft sleeve is not uniform, and the coating range is difficult to control are solved; a static visual monitoring device is adopted to collect clearer and more stable images, so that the problem that the operation state of the robot and the gluing quality are difficult to monitor is solved; an anchoring walking device is adopted, an anchoring mechanism and a walking mechanism are integrated, automatic reducing can be achieved, obstacles in a pipe can be crossed, and the problem that an anchoring mechanism is too complex, cannot pass through the obstacles and is blocked in a well is solved. The remote automatic control system is adopted to achieve remote real-time adjustment of the operation state of the robot, and the problems that the operation requirements of the robot are variable, and the operation state cannot be switched in time are solved.

The invention relates to the field of pipeline engineering maintenance, and discloses a control system and method for an underground hydrogen storage pipeline defect coating machine, and the system comprises an advanced positioning system, a self-adaptive coating system, a coating quality sensing system, a transmission communication system, a visualization device, a movement device, an anchoring device, a centralizing device, a feeding device, a coating device, and an armored cable. The real-time position of a coating machine is locked by adopting an inertial measurement device, error state Kalman filtering and an ultra wide band positioning node, a self-adaptive coating system is used for replacing semi-automatic operation, and the gluing quality of the machine is monitored by adopting a multispectral sensor, a data acquisition and processing unit and an AI analysis engine. In the whole process, real-time communication with a remote upper computer is carried out through cooperation of an armored cable and wireless, the problem of positioning drift caused by an underground GPS-free environment in the prior art is solved, intelligent scheduling and working efficiency of coating operation are improved, controllable gluing quality is achieved, and man-machine interaction and remote control are achieved.

The underground hydrogen storage warehouse comprises a warehouse body and a sealing structure, the warehouse body is buried underground, the warehouse body is sequentially provided with a steel lining layer, a carbon fiber layer and a concrete layer from inside to outside, the steel lining layer is used for sealing hydrogen, one end of the steel lining layer is provided with an installation opening, the carbon fiber layer is wrapped on the periphery of the steel lining layer, and the concrete layer is arranged on the carbon fiber layer. The carbon fiber layer is arranged on the steel lining layer so as to improve the pressure bearing capacity of the steel lining layer, and the concrete layer is used for supporting and fixing the carbon fiber layer and the steel lining layer. The sealing structure seals the mounting opening, and the sealing structure is provided with a communicating hole communicating with the interior of the steel lining layer. According to the hydrogen storage device, hydrogen can be guided into the steel lining layer through the communicating holes to be stored, the periphery of the steel lining layer is coated with the carbon fiber layer, so that the pressure bearing capacity of the steel lining layer is improved, and the steel lining layer can bear the pressure applied by the hydrogen. The carbon fiber layer shares the pressure borne by the concrete layer, so that the load borne by the concrete layer is reduced, the construction requirement of the concrete layer is further reduced, and the construction speed of the hydrogen storage warehouse is greatly increased.

The invention discloses a method for predicting the scale of induced stratum sand production in a geological hydrogen storage process, belongs to the field of underground hydrogen storage, development and utilization, is used for predicting dynamic spatio-temporal evolution characteristics of stratum sand production in the geological hydrogen storage process, and is characterized in that a mathematical model for describing the geological hydrogen storage induced sand production process is established; the method comprises the following steps: establishing a reservoir geologic model of an underground salt water layer according to geologic features of the underground salt water layer, performing grid division on the reservoir geologic model to obtain a plurality of grid units for reflecting different spatial distribution positions of sand grains in the underground salt water layer, and setting initial conditions and boundary conditions of the reservoir geologic model; according to the method, effective characterization of space-time evolution characteristics of migration and output of the stratum sand grains in the geological hydrogen storage process is realized, and effective prediction of the stratum sand production scale in the geological hydrogen storage process is also realized.

The invention discloses an underground hydrogen storage hydrogen-water-rock geochemical reaction evaluation device which comprises a high-pressure injection unit and a reaction kettle body which are communicated through a connecting pipeline, the high-pressure injection unit is used for injecting high-pressure hydrogen into the reaction kettle body, and a core sample to be reacted is placed in the reaction kettle body; a sealing unit is arranged at the communication position of the reaction kettle body and the high-pressure injection unit, a heating and heat preservation unit is arranged on the periphery of the reaction kettle body, a parameter monitoring unit is arranged on the reaction kettle body, and a safety guarantee unit is arranged outside the reaction kettle body. According to the invention, accurate pressurization control of the pressure of hydrogen introduced into the reaction kettle body is realized through a water pressure piston type pressurization structure of the intermediate container, and underground deep reservoir conditions can be simulated in cooperation with a resistance heating wire; the blank of performing evaluation experiment on hydrogen-water-rock geochemical reaction in a pure hydrogen atmosphere under high-pressure and high-temperature conditions in the prior art is filled up, and the research and development of water-rock reaction of the underground hydrogen storage are promoted.

The invention belongs to the technical field of underground hydrogen storage engineering, and particularly discloses an electric field enhanced underground hydrogen storage system and method. The method is used for solving the problems of low injection-production efficiency and small hydrogen storage capacity of a conventional injection-production mode in the current underground hydrogen storage project. Comprising an injection-production well, a first electrode column module and a second electrode column module, the injection-production well is used for injection and production of hydrogen, the first electrode column module represents one electrode of an electric field, and the second electrode column module represents the other opposite electrode of the electric field; the first electrode column module and the second electrode column module are respectively provided with equal quantity of charges with different numbers and are positioned on two sides with the same distance from an injection-production well, and a non-uniform electric field is formed in a reservoir. By applying an extra electric field, hydrogen molecules are polarized, induced dipoles are generated, then under the action of the electric field, the hydrogen flowing speed is increased, the hydrogen storage capacity is increased, and the hydrogen injection and production efficiency is improved.

According to the embodiment of the invention, a pre-obtained test result of the breakthrough pressure of a rock core is utilized to predict the dynamic breakthrough pressure of a cap layer to hydrogen; according to the method for predicting the hydrogen breakthrough pressure of the cap layer, the dynamic breakthrough pressure of the cap layer to the hydrogen does not need to be repeatedly tested, and the dynamic breakthrough pressure of the cap layer to the hydrogen can be rapidly and accurately predicted only by utilizing the breakthrough pressure of the existing rock core and processing the breakthrough pressure of the existing rock core through the method for predicting the breakthrough pressure of the cap layer to the hydrogen provided by the embodiment of the invention; according to the embodiment of the invention, the change rule of the hydrogen breakthrough pressure of the cap layer along with the hydrogen storage pressure and the hydrogen storage time of the cap layer is found, and the blank of lack of the cap layer sealing performance evaluation method in the underground hydrogen storage field of hydrogen is filled.

The present application belongs to the technical field of underground hydrogen storage, and particularly relates to a method for improving underground hydrogen storage capacity by stabilizing hydrogen bubble foam with porous carbon material, comprising the following steps: Step 1, preparing hydrophobic modified porous carbon material: taking biomass waste as raw material, porous carbon material is prepared through carbonization-activation process; the porous carbon material is subjected to hydrophobic modification treatment, so that the water contact angle of the material reaches more than 90°; Step 2, preparing surfactant solution; Step 3, preparing porous carbon-surfactant composite system; Step 4, generation and injection of hydrogen bubble foam: hydrogen and the porous carbon-surfactant composite system are fully mixed in a gas-liquid volume ratio of 1:1 to 10:1, and then injected into the formation. The method can significantly improve the stability of hydrogen bubble foam, improve the hydrogen storage efficiency and hydrogen recovery rate, so as to greatly improve the underground hydrogen storage capacity.

The invention provides an evaluation method based on a microorganism hydrogen consumption numerical model of an exhausted gas reservoir underground hydrogen storage, which comprises the following steps: firstly, determining the type and content of hydrogen-consuming microorganisms in an exhausted oil and gas reservoir according to geological information of the exhausted oil and gas reservoir, and determining the content of the hydrogen-consuming microorganisms in the exhausted oil and gas reservoir according to the type of the hydrogen-consuming microorganisms; considering the reaction and mass transfer process of the hydrogen-consuming microorganisms in the underground hydrogen storage bank, and constructing a mathematical model of the hydrogen-consuming activity of the microorganisms in the exhausted underground hydrogen storage bank; carrying out two-dimensional porous medium model verification calculation on the constructed mathematical model, and randomly generating a three-dimensional porous medium model by utilizing a Monte Carlo method to carry out numerical simulation calculation so as to correct the constructed mathematical model; and finally, analyzing the activity state of the microorganisms in the underground hydrogen storage bank by combining the calculation result of the three-dimensional porous medium model, thereby effectively monitoring the activity state of the hydrogen-consuming microorganisms in the underground hydrogen storage bank, evaluating the safety of the underground hydrogen storage bank and maintaining the long-term stable and efficient operation of the underground hydrogen storage bank.

The invention relates to the technical field of hydrogen-resistant coatings, and provides a surface treatment method of a threaded connecting piece and the threaded connecting piece. The threaded connecting piece comprises a pipe body and a coupling which are matched with each other, and the surface treatment method comprises the steps that the pipe body and the coupling are placed into a tubular furnace, a hydrogen-resistant material is deposited on the thread surface of an internal thread of the coupling and the thread surface of an external thread of the pipe body, and the surfaces of the internal thread and the external thread are provided with hydrogen-resistant coatings; and depositing a self-lubricating material on the surface of the hydrogen-resistant coating to obtain the threaded connecting piece with the hydrogen-resistant self-lubricating composite coating. The hydrogen-resistant self-lubricating composite coating not only solves the problem of corrosion of a special threaded pipe in a hydrogen environment, but also effectively meets the requirements of thread gluing resistance and shaft sealing integrity, and the coating is low in production cost, high in controllability, suitable for industrial production and suitable for the working condition environment of an underground hydrogen storage library.

The invention relates to the technical field of oil and gas field development engineering, carbon storage engineering, underground hydrogen storage technology, underground fluid seepage mechanical experiment technology and rock core displacement simulation devices, and particularly discloses a variable-diameter rock core displacement simulation device and method for simulating underground fluid migration in a near wellbore area. In order to solve the problem that a traditional equal-diameter rock core displacement device cannot simulate sudden drop of flow velocity and pressure gradient when fluid in a near wellbore zone flows radially, the device adopts a variable-diameter rock core design, the diameter of the variable-diameter rock core is gradually increased in the flowing direction, and a back pressure control system, a confining pressure system and a multi-point pressure measuring structure are matched. Under the fixed injection flow, the cross sectional area of the rock core is increased, so that the Darcy flow velocity and the pressure gradient are suddenly reduced from the injection end to the output end, and the flowing environment of the immediate vicinity of a wellbore is directly reproduced. The device can directly and efficiently simulate and test the phase state behavior, rheological property and seepage law of complex fluid under the condition of sudden change of the flow velocity and pressure gradient in the immediate vicinity of wellbore, and the engineering representativeness of experimental data is remarkably improved.

The invention relates to a hydrogen-rock microfluidic in-situ test system and method for simulating underground hydrogen storage. The system comprises an environment control module, a reaction type microfluidic chip, a fluid injection module, a back pressure control module, an in-situ test module and a gas chromatographic analysis module, the environment control module provides a high-temperature and high-pressure environment; the reaction type micro-fluidic chip is arranged in the environment control module and provides a hydrogen-rock reaction place; the inlet end of the reaction type micro-fluidic chip is connected with the fluid injection module, and the outlet end of the reaction type micro-fluidic chip is sequentially connected with the back pressure control module and the gas chromatographic analysis module; the back pressure control module is used for maintaining a preset pressure environment; the in-situ test module is used for capturing fluid distribution and mineral form change in the chip; and the gas chromatographic analysis module is used for analyzing the composition and concentration change of a reaction outlet gas-phase product. According to the device and the method, the micromorphological evolution and the macroscopic reaction rate of the hydrogen-rock reaction in the underground reservoir environment are synchronously monitored, and an accurate experimental means is provided for geological hydrogen storage safety evaluation.

The invention relates to an underground hydrogen storage structure model test system based on optical fibers and a working method thereof, and the system comprises a plurality of groups of lining samples which form a lining structure and are arranged at the inner side of an energy storage chamber; distributed optical fibers are embedded into the inner surface and the outer surface of the lining structure through notch grooves, and the distributed optical fibers are connected with a demodulator through leads. The counter-force unit is provided with a plurality of groups of counter-force plates, and the counter-force plates are uniformly arranged on the outer side of the lining structure and used for simulating displacement and pressure of surrounding rock in the energy storage chamber on the lining structure; the device further comprises a center counter-force cylinder arranged on the inner side of the lining structure, the center counter-force cylinder is filled with water to simulate filled high-pressure gas, and the space between the center counter-force cylinder and the lining structure is filled with water for pressure balance. Water in the center counter-force cylinder is used for simulating high-pressure gas in the underground hydrogen storage facility, the multiple groups of counter-force plates on the outermost layer are used for simulating displacement and pressure of surrounding rock on a lining structure, and the rigidity coefficient is changed by changing the displacement-stress function relation.

The application discloses a hydrogen loss prediction method for an underground hydrogen storage library, and relates to the underground hydrogen storage field.The method comprises the following steps: obtaining time-varying flux of dynamic gas charging and discharging of the underground hydrogen storage library, and establishing a balance physical model of the underground hydrogen storage library; according to a dissolution trend of different minerals under a hydrogen gas, fluid and rock chemical reaction system, a dissolution kinetics model of the different minerals is established; then, the time-varying flux of dynamic gas charging and discharging of the underground hydrogen storage library is combined with the balance physical model and the dissolution kinetics model to solve, so that the change conditions of mineral composition, solution composition and gas composition in the underground hydrogen storage library are obtained, and the hydrogen storage condition of the underground hydrogen storage library is predicted.The application fully considers the complex physical and chemical interaction between hydrogen and reservoir media in the dynamic charging and discharging process of the underground hydrogen storage library, realizes the prediction of hydrogen loss, and improves the efficiency of safe and stable operation of the underground hydrogen storage library.

The invention discloses a construction method of an adsorption type underground hydrogen storage library and a method for preventing hydrogen leakage, and belongs to the technical field of energy storage, the construction method comprises the following steps: S1, preparing a modified material reduced graphene oxide; s2, carrying out modification treatment on the montmorillonite adsorbent; s3, constructing an underground rock salt dissolving cavity; s4, the underground dissolved cavity is filled with montmorillonite; and S5, carrying out temperature, pressure and flow monitoring on the hydrogen storage library. The modified montmorillonite loaded with reduced graphene oxide is used for filling a stratum to establish a hydrogen storage library, so that the hydrogen storage performance is greatly improved, the storage safety of hydrogen is improved, meanwhile, hydrogen injection and production are performed through pressurization and depressurization operation of an injection and production well, the huff and puff efficiency of hydrogen is improved, the economic cost of the hydrogen is reduced, and the method is suitable for popularization and application. And the economical efficiency of the hydrogen storage bank is improved.

The invention is a biological-based phage-aerosol buffer system consisting of a genetically engineered bacteriophage cocktail that targets and selectively destroys only the harmful bacterial species stored in porous subsurface geological formations such as depleted gas fields or aquifers, and a carrier gas that enables the aerosolized transport of this cocktail and its penetration into the micropores of the subsurface formation. The aim of this system is to prevent the consumption of hydrogen and hydrogen-natural gas mixtures (HBNG) by methanogenic and sulfate-reducing bacteria in the reservoir and the formation of toxic / corrosive hydrogen sulfide (H₂S) gas produced by these bacteria.

The medium-carbon martensite and austenite duplex stainless steel is prepared from the following components in percentage by mass: 0.4%-0.6% of C, 14%-18% of Cr, 4%-8% of Ni, 1%-2% of Mo and the balance of Fe. The invention also discloses a preparation method of the medium-carbon martensite and austenite duplex stainless steel, which specifically comprises the following steps: mixing the prepared C, Cr, Ni, Mo and Fe, carrying out vacuum melting to obtain a solid solution, then carrying out solid solution and casting to obtain a cast ingot, then carrying out quenching and rolling to obtain a rolled plate, and finally tempering to obtain the martensite and austenite duplex stainless steel. The martensite austenite double-phase structure is obtained by increasing the austenite content, increasing the hydrogen trap concentration and improving the hydrogen embrittlement resistance of the material and changing the heat treatment mode of the martensite stainless steel, and the novel martensite stainless steel material suitable for working conditions such as high-pressure hydrogen transmission and underground hydrogen storage reservoirs is developed.

This invention relates to the field of underground hydrogen storage well processing technology, specifically to a hot rotational molding method for underground hydrogen storage wells and an underground hydrogen storage well. The molding method includes: firstly, assembling single-section hydrogen storage cylinders and inter-cylinder connectors into a composite component for integral hot rotational molding; then, cutting and disassembling the connection area; and finally, reorganizing the coating structure by connecting multiple coated hydrogen storage cylinders in series and combining them with hot-melt welding technology. Under the synergistic effect of the three-stage process, a uniform, continuous, and high-bonding-strength integral polymer lining is formed on the inner wall of the ultra-long underground hydrogen storage well, which can achieve a low hydrogen permeability coefficient and a high resistance to hydrogen embrittlement.

The invention provides a device and a method for simulating biochemical reaction of hydrogen in a multi-physics coupling environment, and relates to the technical field of hydrogen reaction devices. Solid reactants and liquid reactants can be placed respectively, reaction experiments of various combinations of hydrogen and different reactants can be achieved according to corresponding requirements, conditions such as internal temperature and humidity are adjusted in cooperation with the temperature and humidity adjusting module, a real reaction scene is simulated, and the experiment efficiency is improved. A platform is provided for researching the interaction between hydrogen and corresponding reactants such as rocks, microorganisms and solutions, different research requirements are met, and research conditions are provided for researching the stability and leakproofness of underground hydrogen storage.