50 results about "Geologic sequestration" patented technology

The invention is applicable to the technical field of coal bed gas development and geological sequestration, and provides a THMC multi-field coupling simulation method and system for a process of displacing CH4 by coal bed CO2, and the method comprises the following steps: collecting multi-source parameter information of a target coal bed; according to the multi-source parameter information, constructing a coal seam structure model comprising a matrix and a crack system; constructing a control equation system based on the coal seam structure model, and introducing a multi-field coupling mechanism to obtain a fully-coupled mathematical model; performing numerical solution on the fully-coupled mathematical model to obtain a spatio-temporal evolution result of the key field variables; and according to the spatio-temporal evolution result of the key field variable, evaluating the index of the target coal seam. According to the invention, a heat-force-gas-chemical multi-physical field full-coupling simulation system is constructed, so that the CH4 recovery rate and the CO2 storage stability can be accurately predicted. The method is suitable for gas injection-storage coupling optimization of a multi-coal-rank and low-permeability coal seam, and has high precision, high adaptability and remarkable engineering guidance value.

The invention discloses a zero-carbon method for strengthening coal seam gas recovery and CO2 storage by using flue gas residual heat in the technical field of residual heat utilization, gas extraction and carbon emission reduction. The zero-carbon method comprises the following steps: step 1, collecting high-temperature flue gas in a power plant; step 2, performing high-temperature CO2 concentration-compression; step 3, reservoir evaluation and area selection; 4, designing and constructing a horizontal well; 5, high-temperature CO2 injection and joint control energy increasing are conducted, specifically, high-temperature CO2 is injected into a preset section through a pump, the injection pressure and the injection speed are adjusted through the joint control energy increasing technology, and the diffusion range and the diffusion speed of CO2 are controlled; 4, gas recovery and CO2 storage: high-temperature CO2 is used for providing energy to promote gas desorption on one hand, and the high-temperature CO2 and CH4 in the adsorption state are subjected to competitive adsorption on the other hand. The method is simple and easy to operate, the coal seam gas partial pressure is reduced through CO2 injection, the recovery efficiency is improved, CO2 can be adsorbed by a coal seam and stored in a reservoir, and geological storage of CO2 is achieved.

The invention relates to the technical field of coal mine gas control and CO2 geological storage, and particularly discloses a soft coal seam dynamic fracture self-adaptive CO2 displacement-anti-reflection integrated system which comprises a dynamic fracture monitoring unit, a CO2 collaborative anti-reflection unit, a self-adaptive regulation and control unit and a safety protection unit. The dynamic fracture monitoring unit is used for capturing coal seam fracture development dynamics and gas injection process parameters in real time; the self-adaptive regulation and control unit is in communication connection with the dynamic fracture monitoring unit, and the CO2 synergistic anti-reflection unit is in control connection with the self-adaptive regulation and control unit and is used for realizing CO2 enhanced anti-reflection displacement; the safety protection unit is used for guaranteeing system operation safety. According to the method, real-time adaptation of the coal seam fracture state and the injection-production parameters is achieved, the problems that in a traditional fixed parameter mode, the displacement efficiency attenuation is fast, and the coal body stability is poor are solved, the CH4 recovery rate and the CO2 storage rate are increased, and the safety and high efficiency of soft coal seam gas control operation are guaranteed.

The invention provides a method and system for directly utilizing and sealing flue gas of a coal-fired power plant, and the method comprises the following steps: carrying out filtering and impurity removal treatment on the flue gas of the coal-fired power plant to obtain treated flue gas; according to user requirements and actual production conditions, a target processing path is determined from multiple processing paths, and the multiple processing paths comprise geological storage, oil reservoir development, gas reservoir development and energy storage system power generation; according to the target treatment path, the treated flue gas is compressed in a corresponding compression mode and stored in a gas storage tank; treating the flue gas in the gas storage tank according to the target treatment path, and sealing and storing the flue gas; according to the system, the energy consumption and the cost of a carbon capture link can be reduced, and multi-treatment-path collaboration and benefit maximization are realized.

The invention discloses a coal rock carbon dioxide sequestration amount estimation method based on a CT image. The method comprises the following steps: S100, sample pretreatment and CO2 injection saturation treatment; s200, performing CT scanning and image processing; s300, reconstructing a three-dimensional model; s400, distinguishing the CO2 in the adsorption state from the CO2 in the free state; s500, the CO2 adsorption amount is calculated; and S600, calculating and verifying the unit assignment amount. The coal rock carbon dioxide adsorption capacity estimation method based on the CT image has the remarkable beneficial effects of improving the experiment efficiency, ensuring the data accuracy, reducing the cost, enhancing the intuition, promoting the environmental friendliness and the like, and provides powerful support for research and application of a coal rock CO2 geological storage technology.

Embodiments of the present application relate to a carbon sequestration basic geology GIS data system platform and equipment. The platform comprises: a resource data layer configured to manage and organize regional spatial data, attribute data and resource data related to carbon sequestration; a technical support layer configured to be based on a preset platform to integrate object-oriented technology, component technology, GIS and Web GIS technology and three-dimensional modeling technology, including a spatial database for organizing the regional spatial data and a relational database for organizing the attribute data; a business application layer configured to provide a preset business according to a received user operation processing platform service function; and a user permission layer configured to manage application permissions of the preset business of a plurality of preset level users. Different users will be provided with source carbon reduction and carbon removal solution options, and scientific basis will be provided for CCUS regional large-scale deployment of geological sequestration site selection and large-scale demonstration of CCUS.

The invention belongs to the technical field of CO2 geological sequestration experiment evaluation in a CCUS-EOR project, and particularly relates to a carbon dioxide reservoir sequestration effect experiment comprehensive evaluation method. The method comprises the following steps: carrying out a carbon dioxide displacement saturated oil-water rock core experiment, simulating an actual oil reservoir CO2 injection and geological storage process, and calculating a storage evaluation index of CO2 in an experiment simulated oil reservoir on a rock core scale in combination with experimental test data; and quantitatively evaluating the carbon dioxide reservoir storage effect of the target reservoir under the corresponding working conditions by using the core scale CO2 storage index. The technical problem that a CO2 storage experiment method and a storage index quantitative evaluation method for oil reservoirs in the later stage of water flooding development are lacked at present is solved.

The invention belongs to the technical field of rock physics and multiphase flow coupling seismic wave propagation simulation, and discloses a wave velocity-attenuation whole-process calculation method based on an Lo two-phase fluid model. According to the method, thermodynamic characteristics of CO2-saline two-phase fluid are obtained by utilizing temperature and pressure conditions of a target reservoir, seepage characteristics are fitted according to experimental data, and a unified medium physical property layer is constructed by combining fluid parameters and rock skeleton parameters; after an elastic matrix, an inertia matrix and a viscosity matrix of a multiphase medium are calculated according to physical property parameters, phase velocity and attenuation characteristics of three types of longitudinal waves and one type of transverse waves are obtained through a Lo two-phase fluid model control equation. According to the method, a complete technical process from physical property construction, control equation solution to sensitivity judgment and mechanism analysis is formed, the method can be used for seismic monitoring, reservoir feature recognition and relevant parameter inversion in the CO2 geological storage process, and the method has good engineering applicability and popularization value.

The invention relates to the field of chain carbon management, discloses a full supply chain carbon management method and system for coupling carbon capture and storage of a coal-fired power plant, and is used for providing reliable technical guarantee for green transformation of the coal-fired power plant. Comprising the following steps: generating a global dynamic geological carbon potential field distribution diagram based on real-time working conditions and pre-evaluated geological attribute data of a storage library; generating a geological priority scheduling instruction for each batch of carbon dioxide according to the distribution map; when the carbon dioxide is injected into the conveying pipe network, creating and binding a globally unique carbon asset digital identifier for the carbon dioxide; and after injecting into the target sequestration library, accounting geological sequestration value data based on geological attributes and logistics information of the target library, and registering all the data to a trusted carbon asset account book to form a permanent carbon removal asset record. According to the method, safe optimal scheduling is realized through the geological carbon potential field, and high-quality and high-price carbon assets are realized by using geological value-added factors.

The invention discloses a coal-fired power plant CO2 geological storage and enhanced geothermal power generation combined site selection design method. The method comprises the following steps: collecting CO2 emission data and geographic position coordinates of each coal-fired power plant in a target area; generating a coal-fired power plant spatial distribution diagram in the ArcGIS platform; collecting geological data of a hot dry rock occurrence prospective area in the same target area; delineating and generating a hot dry rock occurrence prospective area distribution map in the ArcGIS platform; the distance from each coal-fired power plant to the nearest hot dry rock occurrence prospective area is calculated, so that the optimal CO2 storage place is matched for each coal-fired power plant; and calculating the transportation cost of transporting CO2 from each coal-fired power plant to the matched hot dry rock occurrence prospective area, and integrating all information to form a site selection design scheme. The method is suitable for areas where hot dry rock resources are widely distributed, the coal-fired power plant CO2 geological storage and enhanced geothermal power generation combined technology in the areas can be achieved, and the CO2 emission of the areas is reduced.

The utility model discloses a mine water storage well mouth pressure detector capable of self-adaptively adjusting, which relates to the technical field of mine water geological storage and comprises a shell, a fixing cylinder, a fixing lifting lug and a fixing pipe I. An adjusting mechanism is arranged on the inner wall of the bottom of the shell, and a limiting mechanism is connected above the adjusting mechanism. The limiting mechanism penetrates through the outer arc wall of the shell in the radial direction in a sliding mode, the adjusting mechanism comprises an inner gear ring rotationally connected to the inner wall of the bottom of the shell, the inner side of the inner gear ring is in meshed connection with a driven gear, and a fixed gear is coaxially fixed to the top end of the driven gear; according to the utility model, the limiting mechanism can be driven by the adjusting mechanism to stretch out and draw back so as to adapt to drill holes with different sizes, the flexibility and adaptability of installation are improved, and the sensor can be better attached to the inner wall of the drill hole during installation due to the design of the limiting mechanism, so that the measurement accuracy is improved; and the measurement error caused by a gap between the sensor and the inner wall of the drill hole is also reduced.

The invention discloses a coal-series gas carbon dioxide production increasing simulation method based on a low-field nuclear magnetic resonance technology, and belongs to the technical field of coal-series gas development. The method specifically comprises the following steps: (1) simulating gas bearing conditions of different lithologic reservoirs under a waste condition; (2) identifying the occurrence state of polymorphic CH4 in each lithologic reservoir based on a low-field nuclear magnetic resonance technology; (3) CO2 is injected into all the lithologic reservoirs, and the CO2 air inflow in all the lithologic reservoirs is recorded in real time; (4) quantitatively representing the phase change of the multiphase fluid along with the CO2 injection time after the CO2 enters each lithologic reservoir based on the dynamic quantification of the multiphase fluid; and (5) constructing a response surface model, and determining the optimal injection condition of CO2. According to the method, the CO2 injection amount, the multi-state CH4 occurrence state change and the multi-phase fluid phase evolution in different lithologic reservoirs under the waste condition are monitored in real time, data support is provided for optimizing parameters such as CO2 injection pressure, temperature and duration, and the double targets of efficient utilization of coal series gas residual resources and CO2 geological sequestration are achieved.

The invention discloses a carbon dioxide energy-saving reinjection system and method based on geological sequestration, and belongs to the technical field of carbon dioxide reinjection, the system comprises a pressurization-air cooling system, an auxiliary cooling system and a restart auxiliary system, the pressurization-air cooling system is connected with an upstream carbon source and a downstream reinjection pipeline, so that a medium meets the requirement for stable reinjection pressure; the auxiliary cooling system is arranged on the downstream portion of the pressurization-air cooling system and used for conducting secondary temperature adjustment on high-pressure CO2 when the atmospheric temperature is high, and the temperature of CO2 injected into the reinjection system is reasonably reduced. And the restarting auxiliary system is arranged at a reinjection wellhead and is used for additionally injecting low-temperature CO2 into the wellhead for displacement of the wellbore medium after transportation stop, so that the density of the medium in the wellbore is improved, and the injection pressure of the reinjection ground system is reduced. Efficient, economical and safe CO2 energy-saving reinjection can be achieved, and the problems that due to the fact that the temperature of an injected medium is too high, utilization of the static pressure difference of a shaft is insufficient, and reinjection pressure is too high are effectively solved.

The application relates to the technical field of underground energy storage and CO2 geological storage, in particular to a crude oil injection-production storage system and a crude oil injection-production storage method. The crude oil injection-production storage system comprises an oil storage library for storing crude oil, a gas storage library for storing CO2, a first pipeline assembly with a first passage to connect the oil storage library and the gas storage library, and the first pipeline assembly is connected to a surface storage facility; a second pipeline assembly with a second passage to connect the oil storage library and the gas storage library, and the second pipeline assembly is connected to the surface storage facility; a valve assembly arranged in the first pipeline assembly and the second pipeline assembly respectively to control the connection state of the first passage and the second passage; wherein the oil storage library and the gas storage library are both salt cavern spaces formed by water-soluble mining of a salt rock stratum. The CO2 displacement does not cause water resource pollution and crude oil waste, effectively improves the salt cavern utilization rate and economic benefits, and realizes efficient utilization of CO2 and CO2 geological storage.

The utility model discloses a corrosion-resistant water delivery pipeline for geological storage of mine water, which relates to the technical field of water delivery pipelines and comprises a main pipeline, a first mounting frame is mounted on one side of the main pipeline, two second mounting frames are fixedly connected to the outer wall of one side of the first mounting frame, and a threaded rod is rotatably connected to the inner wall of the first mounting frame. The outer wall of the threaded rod is in threaded connection with a moving block, the outer wall of one side of the moving block is fixedly connected with a pushing block, the inner wall of each second mounting frame is provided with a double-pipeline linkage assembly, and the top end and the bottom end of the pushing block abut against the two sets of double-pipeline linkage assemblies correspondingly; according to the utility model, the double-pipeline linkage assembly is utilized to switch the water flow path through the linkage valve, and only the branch to be cleaned is closed under the condition that the main pipeline is not stopped, so that the condition of flow stop caused by cleaning of the branch is avoided, and the continuity of the flow is ensured.

The utility model discloses a multifunctional mine water geology sealing pipeline cleaning device, which relates to the technical field of pipeline cleaning and comprises a mounting shell, a motion adjusting component is mounted in the mounting shell, and the bottom end of the motion adjusting component is fixedly connected with a cleaning component; the motion adjusting assembly comprises a rocker rotationally connected with the inner wall of the mounting shell, one end of the rocker is fixedly connected with a first transmission wheel, and the outer wall of the first transmission wheel is sleeved with a transmission belt. In the utility model, the movement adjusting component is matched with the cleaning component to realize that the mechanical energy is directly converted into the rotation and linear movement of the cleaning brush head by manually rotating the handle, so that the dependence on electric power or compressed air is avoided, and the damage of environmental factors such as high humidity, much dust and electromagnetic interference on a power system is avoided; and the assembly can be immediately put into use without waiting for power supply connection or equipment debugging, so that the response time of emergency repair conditions is shortened.

The application provides an experimental measurement method and device for evaluating deep migration of a foamed formation, and a storage medium, and belongs to the technical field of oil and gas field development engineering and carbon storage engineering. The method comprises the following steps: adopting a variable-diameter core displacement to simulate the flow condition of a sudden drop of a flow rate and a pressure gradient when a formation injection fluid flows radially from a near-wellbore zone to a deep part of the formation, so as to make up for the defect that a conventional equal-diameter core displacement cannot simulate the flow condition; measuring the steady-state pressure gradient of each part of the variable-diameter core under a certain injection flow rate sequence, so as to effectively measure the critical pressure gradient and the critical flow rate condition required for foam generation, transportation and stable maintenance, and to evaluate the influence mechanism and law of each factor on the critical condition; and the method can be used for predicting the migration distance of the deep part of the foamed formation, and evaluating the feasibility and dynamic behavior law of large-scale foam mobility control, and has important significance for guiding and optimizing the engineering application of the foam mobility control technology in the fields of CO2 flooding and geological storage and deep profile control.

This invention belongs to the field of energy storage and carbon sequestration technology, and discloses a method and system for underground space energy storage coupled with abandoned mine CO2 sequestration and utilization. The method includes the core steps of site suitability evaluation and target layer selection, underground cavity sealing and reinforcement and functional zoning, construction of surface energy storage injection and production system, coordinated operation of energy storage and sequestration, and dynamic monitoring and control throughout the entire life cycle. The system consists of an underground energy storage cavity, an integrated surface energy storage injection and production system, and a multi-site coordinated monitoring and intelligent control unit. This invention uses supercritical CO2 as a common medium to simultaneously realize long-term peak-shaving energy storage for the power grid and large-scale geological sequestration of industrial CO2 within the same engineering system. Functional zoning is used to construct energy storage pressure regulating cavities and permanent sequestration cavities to meet dual operating conditions, and a multi-layer seepage-proof sealing structure and a full-cycle intelligent control system are used to prevent leakage risks. This invention solves the pain points of insufficient economic benefits of traditional CO2 sequestration projects and high construction costs of conventional supercritical CO2 energy storage.

The application discloses a CO2 geological storage reservoir parameter inversion method combined with well-seismic multi-source data, relates to the technical field of CO2 geological storage, and obtains multi-source observation data in the CO2 geological storage process; a priori geological model set for representing reservoir heterogeneity is established; an observation error covariance matrix for comprehensively reflecting multi-source observation uncertainty is constructed; forward calculation is performed on the priori geological model to obtain predicted observation data; high-dimensional observation information is processed in a dimension reduction manner; and reservoir model parameters are iteratively updated. The application implements reservoir parameter inversion by combining well time-series data and seismic spatial data, significantly reduces the posterior uncertainty range of key parameters such as reservoir permeability, improves the precision of CO2 plume distribution and storage amount prediction, and enhances the numerical stability and physical rationality of the assimilation process. The TSVD dimension reduction strategy is introduced to effectively solve the ill-conditioned problem and set degeneration phenomenon in high-dimensional data assimilation, and the robustness of the algorithm under the condition of high-dimensional observation data is ensured.

The invention discloses a comprehensive testing device and method suitable for CO2 geological storage cover layer valve pressure and breakthrough pressure. The device comprises a stress application module, an environment simulation module, a fluid control module, a sensing monitoring module, an auxiliary execution module and a control and display module. The environment simulation module constructs a stratum in-situ temperature and pressure environment through a reaction kettle with temperature controlled by a resistance wire and oil-filled confining pressure. The stress applying module reproduces a mining-induced stress path through a mining-induced stress servo press; the fluid control module realizes water-CO2 multiphase flow regulation and control by virtue of a double-phase injection pump and an external tempered glass sleeve, and is matched with a gas-liquid separation structure to guarantee data accuracy; the sensing monitoring module synchronously collects temperature, pressure and strain data. The testing method comprises the steps of sample loading, environment simulation, stress application, hydraulic seepage simulation, valve pressure measurement, breakthrough pressure measurement and sample unloading maintenance. According to the method, the environment reproduction degree and the test precision are improved, the test period is shortened, complex lithology and load scenes are adapted, and reliable support is provided for cover layer sealing capacity evaluation.

The invention discloses a coal expansion strain calculation method based on an optical fiber sensor and gas injection, and belongs to the technical field of monitoring of CO2 geological storage and oil and gas resource development. The method comprises the following steps: firstly, spirally packaging distributed optical fibers on the surface of a coal sample, and simulating formation temperature and pressure conditions through a triaxial stress system; then, compressed gas is injected, and full-field strain distribution is monitored in real time through the Rayleigh scattering optical fiber sensing technology; analyzing an edge effect and a confining pressure inhibition rule in the strain data; and finally, constructing a coal expansion model to quantify strain spatio-temporal evolution characteristics. Compared with a traditional method, the monitoring scheme is higher in resolution and higher in real-time performance, the migration state of the sealed gas can be dynamically tracked, and reliable data support can be provided for deep coal bed gas sealing safety assessment, injection parameter optimization and leakage early warning.

This invention discloses an intelligent prediction method for wellbore operating status based on a hybrid deep learning framework, belonging to the field of oil and gas field development engineering in petroleum engineering. The method includes the following steps: establishing a transient temperature-pressure coupled mathematical model for geological storage wellbore and performing numerical solutions; constructing a dual-sequence feature database covering CO2 injection and leakage conditions; using a parallel architecture to process the dual-sequence features and constructing an improved dual-attention network; establishing a hybrid deep learning framework DT-DANet by coupling the improved dual-attention network and a time-fusion Transformer; and using a composite loss function to collaboratively optimize and train the hybrid deep learning framework. The output of this framework is the wellbore pressure profile, temperature profile, and phase distribution at different time steps. This invention achieves high-precision prediction of the dynamic evolution of multiple parameters in the wellbore during CO2 geological storage.

The invention belongs to the technical field of coal mine green mining and CO2 geological storage, and particularly relates to a deep well strip structure type paste filling physicochemical collaborative carbon dioxide storage method which comprises the following steps: constructing a transportation gate road, an air return gate road and an air return channel for communicating the transportation gate road and the air return gate road on a coal face, and dividing the coal face into an even number of equal-width strips; the multiple paste filling strips are constructed in sequence, and filling bodies are used for filling; the second carbon sequestration strip is constructed so that the second carbon sequestration strip can be communicated with the conveying gate road and the air return gate road, and then an air return channel is closed; and the remaining carbon sequestration strips are sequentially constructed and sealed, and CO2 is injected for sequestration after sealing treatment is completed. According to the method, strip mining, paste filling and the CO2 storage process are coordinated, the coal-based solid waste is consumed, the CO2 storage capacity and safety are improved, and the technical problems that the traditional storage amount is small and leakage is prone to occurring are effectively solved.

The invention relates to the technical field of geological sequestration, in particular to a geological sequestration leakage risk model experimental device and experimental method. The experimental device comprises a stress loading mechanism, the stress loading mechanism comprises a shell assembly, a rock sample and at least six pressurizing assemblies, and the pressurizing assemblies can apply stress to the rock sample through the shell assembly; the shell assembly comprises at least two first supporting assemblies, at least two second supporting assemblies and at least two third supporting assemblies which are oppositely arranged, and each of the first supporting assemblies, the second supporting assemblies and the third supporting assemblies can be divided into a first supporting component, a second supporting component and a third supporting component. The stress is applied to the first support member in the first direction, the stress is applied to the second support member in the second direction, and the stress is applied to the third support member in the third direction. Therefore, the stress loading mechanism can apply mutually perpendicular three-dimensional stress to the rock sample to simulate a crustal stress environment so as to analyze and compare the influence of different crustal stress and construction conditions on geological sequestration leakage.

The invention discloses a simulation system for displacing and replacing methane in different lithology by carbon dioxide, and belongs to the technical field of unconventional natural gas resource development. The simulation system comprises a core clamping module, a gas injection module, a cyclic heating module, a temperature, pressure and flow control module, a low-field nuclear magnetic resonance monitoring module and a data acquisition and analysis module. According to the simulation system, dynamic simulation and real-time monitoring of CO2 displacement CH4 in stacked lithology can be achieved, the simulation system can be widely applied to optimization of development schemes of coal bed gas, shale gas and tight sandstone gas, and an experimental basis is provided for CO2 geological sequestration and a natural gas recovery ratio (EGR) improving technology.

The embodiment of the invention provides a carbon sequestration site determination method and device, a storage medium and electronic equipment, and the method comprises the steps: obtaining underground geophysical prospecting data of a target region, the underground geophysical prospecting data at least comprises geological structure information corresponding to the target area and seismic data corresponding to different geological structures of the target area; performing well connection contrastive analysis on the underground geophysical prospecting data to predict depth information corresponding to different geological structures in the target area; simulating the geological storage process of CO2 under different geological structures according to the depth information and the geological structure information so as to determine storage potentials corresponding to the different geological structures; and determining a target location for carbon sequestration in the target area according to the depth information and the sequestration potential. According to the method, the problem that the carbon sequestration site of the region under the complex geological condition is difficult to determine in the related technology can be solved.

The application relates to a CO2 geological storage environment integrity intelligent monitoring device, which comprises a solar power supply device, a CO2 concentration monitoring device, a ground surface deformation monitoring device, a groundwater monitoring device, a microseismic monitoring device and a data transmission device. The device realizes integrated and intelligent monitoring of nine environmental factors of three interfaces, i.e. a shallow stratum, a ground surface and near-ground surface atmosphere, reduces human input, avoids the intermittence of artificial monitoring, and is beneficial to comprehensively, scientifically and timely reflecting the influence of the environment integrity of the storage site.

This invention provides a method and apparatus for evaluating the non-pure CO2 storage potential of tight sandstone gas reservoirs. The evaluation method includes: conducting experiments on the non-pure CO2-CH4 phase state, non-pure CO2-water-rock reaction, long core injection CO2 storage, and caprock breakthrough pressure testing; constructing a numerical simulation mechanism model and a field model to explore the non-pure CO2 storage law and influencing factors of the target gas reservoir and clarify the CO2 storage capacity of the target gas reservoir; processing experimental and simulation data to construct a machine learning dataset; using multiple algorithms for machine learning training to construct a proxy model for predicting the geological storage capacity of non-pure CO2 in tight sandstone gas reservoirs; evaluating the accuracy of the proxy model through regression algorithm evaluation indicators for optimal selection; and combining experimental, numerical simulation, and machine learning prediction results to evaluate the non-pure CO2 storage potential of the target tight sandstone gas reservoir. This invention can achieve qualitative and quantitative evaluation of the non-pure CO2 storage potential of tight sandstone gas reservoirs.

The present application belongs to the technical field of CO2 geological storage, and particularly relates to a method for predicting CO2 leakage after cap layer rupture and reservoir breakthrough in CO2 geological storage, wherein the present application establishes a CO2 storage model to simulate the storage process under different CO2 injection amounts, and establishes a correlation between the strain and pressure in the cap layer and the gas saturation in the cap layer and the gas saturation in the reservoir through machine learning, thereby proving the correlation between the CO2 injection amount and the strain and pressure response, indicating that the strain and pressure monitoring can track the CO2 injection process, provide protection for safe injection, and reduce the CO2 leakage risk caused by the geomechanical effect. The present application is convenient to operate, and after the machine learning is completed, the trained model is deployed to the production environment, and the discrimination of CO2 leakage can be completed only by processing the data monitored by the computer, so that the cap layer rupture and reservoir breakthrough problems can be found in advance and the corresponding positions can be determined.

The invention discloses an experimental device and method for simulating multi-element medium injection huff and puff of a fractured horizontal well, and relates to the technical field of oil and gas exploitation multi-element medium injection for improving the recovery ratio and geological storage. The invention provides a multi-element medium injection huff and puff model and experimental method for a horizontal well, the type of the horizontal well can be a multilateral well, a fishbone well and the like, the simulated injection medium comprises water injection, gas injection and chemical flooding injection, and the corresponding model and experimental method can meet the requirement that under the action of edge and bottom water, the water injection efficiency can be greatly improved. Multiple injection medium huff and puff exploitation modes of multiple types of horizontal wells are adopted, so that actual production conditions in an oil reservoir are closer; according to the designed physical model and the experimental method, the range that the model is suitable for injection-production development of multiple fluids of the horizontal well is widened, then the development effect evaluation requirement of the horizontal well under the condition of multiple injection media is met, the indoor simulation method is closer to the actual oil reservoir condition and development mode, the evaluation time is shortened, the development cost is reduced, and the development efficiency is improved. And an indoor evaluation technology for improving the recovery efficiency is perfected.