222 results about "Geological sequestration" patented technology

The invention provides an intelligent pressure management system, method and terminal for geological sequestration of carbon dioxide, and the system comprises the steps: collecting the pressure data of the interior and peripheral key positions of each geological reservoir in real time through a pressure monitoring subsystem, and then carrying out the data preprocessing and feature extraction through a data processing and analysis subsystem; and predicting the reservoir pressure change trend in a specific time period in the future. If the predicted reservoir pressure change trend pressure is too high, high-risk related information is transmitted to the intelligent regulation and control subsystem, and the intelligent regulation and control subsystem regulates and controls the reservoir pressure by regulating the flow of a carbon dioxide injection well and a production well or starting a pressure release device according to a preset strategy and dynamically regulates a regulation and control mode according to pressure data. Meanwhile, the communication and monitoring subsystem transmits system operation data to a remote monitoring terminal in real time, so that real-time monitoring is facilitated. Real-time, accurate and automatic regulation and control of the pressure of the geological reservoir are achieved, the stability and safety of the geological reservoir in the carbon dioxide injection process are guaranteed, the geological storage effect of the carbon dioxide is improved, and various negative effects caused by too high pressure are avoided.

The present disclosure relates to the field of CO2 geological sequestration, and provides a whole-process multi-parameter monitoring device and method for simulating CO2 geological sequestration and use thereof. A large-scale reactor body is developed, and a geological reservoir at a depth of 800 to 3000 meters is simulated. A modular built-in model device is researched and developed, a multi-type and variable-structure reservoir remodeling technology is developed, and mutual coupling of modules can be achieved. The design idea of separating the pressure reactor from the built-in sample model is adopted in the device. The confining pressure, the pore pressure, the temperature gradient, and the axial load of the device can be independently controlled through a temperature control mechanism and a loading mechanism respectively, so that the restoration of the state of in-situ stresses in the reservoir is realized.

The invention relates to a carbon dioxide salt water layer geological storage site selection method and system, and belongs to the technical field of carbon dioxide energy conservation and emission reduction. The site selection method comprises the following steps: acquiring logging data and a geological data set of a target area, and identifying a potential salt water interval based on a preset rule; grading quantitative evaluation is carried out according to the identified potential salt water interval, and a corresponding evaluation index system is established; wherein the evaluation index system comprises a plurality of first-level evaluation indexes and a plurality of second-level evaluation indexes corresponding to each first-level evaluation index, and the first-level evaluation indexes comprise geological sequestration condition evaluation, sequestration capability condition evaluation and social environment condition evaluation; carrying out weight assignment on the evaluation indexes in the evaluation index system based on an index weight assignment method, and carrying out comprehensive quantitative evaluation to obtain a comprehensive evaluation score of each candidate target region; and taking the candidate target region with the highest comprehensive evaluation score as a storage site for geological storage of the carbon dioxide saline water layer. According to the invention, the scientificity and reliability of storage site selection can be improved.

The invention discloses a method and device for predicting the geological storage amount of carbon dioxide and a medium, and relates to the technical field of carbon dioxide capture, utilization and burying. The method comprises the steps that whether a to-be-predicted oil and gas reservoir and a control oil and gas reservoir are in the same block or not is judged; if yes, inputting the geological data, the production dynamic data and the injection parameter combination scheme of the to-be-predicted oil and gas reservoir into the optimal control oil and gas reservoir carbon dioxide geological sequestration quantity prediction model to determine the whole-area accumulated carbon dioxide geological sequestration quantity of the to-be-predicted oil and gas reservoir; if not, geological data, production data and an injection parameter value range of the to-be-predicted oil and gas reservoir are obtained, migration training is conducted on the optimal control oil and gas reservoir carbon dioxide geological sequestration quantity prediction model, and a to-be-predicted oil and gas reservoir carbon dioxide geological sequestration quantity prediction model is obtained; and determining the whole-area accumulated carbon dioxide geological sequestration amount of the to-be-predicted oil and gas reservoir. According to the invention, the precision and efficiency of carbon dioxide geological sequestration quantity prediction are improved.

The invention discloses a construction method of an artificial geological cover layer for carbon dioxide sequestration, and belongs to the technical field of carbon dioxide sequestration. The construction method of the artificial geological cover layer for carbon dioxide sequestration comprises the following steps: determining construction parameters of the artificial geological cover layer; determining the position of an overlying strata artificial geological cap layer in the mining space, and determining the position of an overlying strata key layer by using a key layer discrimination method according to drilling geological data of a mining area; determining the following grouting parameters including arrangement and size of ground grouting holes, proportion and particle size of grouting materials and grouting pressure; grouting is conducted on the artificial geological cover layers with different depths; and CO2 leakage of the artificial geological cover layer is monitored. According to the construction method of the artificial geological cap layer for carbon dioxide sequestration, the CO2 coal mine mining space geological sequestration reserves can be increased, and the application range of the CO2 coal mine mining space geological sequestration technology is wider.

The invention relates to the technical field of CO2 geological sequestration, and provides a pore scale multi-field coupling model construction method for salt precipitation caused by CO2 injection in a salt water layer, which performs numerical simulation on real-time distribution of related variables such as flow velocity, temperature and concentration in a domain at a pore scale, can realize accurate research on a salt precipitation micromechanism during CO2 injection, and can realize accurate research on the salt precipitation micromechanism during CO2 injection. The method comprises the following steps that S1, a two-dimensional single-pore geometric model is established, and the two-dimensional single-pore geometric model comprises a fluid inlet, a fluid outlet and a pore wall connecting the fluid inlet and the fluid outlet, wherein the fluid inlet and the fluid outlet are parallel to each other; s2, respectively establishing a CO2 material and a saline material, adding a physical field, setting boundary conditions and initial conditions of the two-dimensional single-pore geometric model, and performing grid division on the two-dimensional single-pore geometric model; and S3, performing parameter calculation according to the two-dimensional single-pore geometric model, the CO2 material, the saline material and the physical field, and obtaining a micromechanism according to an obtained calculation result.

The invention discloses a gas permeability monitoring method and system based on carbon dioxide geological sequestration, and relates to the technical field of gas permeability monitoring, and the method comprises the following steps: obtaining geological data and a first constraint condition of a target stratum; disturbing the seismic wave frequency to generate a plurality of seismic monitoring control sets; constructing a three-dimensional geological model and a wave velocity change simulation model of the sequestration area, and performing forward simulation to obtain wave velocity change response data under different frequency combinations; wave velocity disturbance characteristic distribution caused by carbon dioxide injection under different earthquake monitoring control sets is obtained, and the set evaluation model is weighted and trained; constructing a second set according to an evaluation result of the set evaluation model and a corresponding earthquake monitoring control set; and fitting a multi-dimensional curved surface according to the second set, and screening an optimal seismic monitoring control set for seismic data acquisition and inversion, thereby solving the problem that traditional single-frequency-band inversion cannot dynamically match a stratum structure and permeability characteristics.

The invention provides a method for monitoring and evaluating the operation condition of equipment in a carbon dioxide sequestration site. The method comprises the following steps: acquiring operation data of the equipment; carrying out preprocessing and multi-modal feature fusion on the operation data; performing anomaly detection based on a machine learning model, and calculating an equipment health index; and according to the health index of the equipment, evaluating the current operation condition of the equipment, including normality, attention, early warning or fault. The problem that hidden faults of equipment are difficult to find due to the fact that an existing monitoring method lacks fusion analysis on multi-source data is solved. The invention discloses a method for monitoring and evaluating the operation condition of equipment in a carbon dioxide sequestration site, which realizes real-time monitoring, fault prediction and intelligent maintenance of sequestration equipment through multi-source sensor data fusion, a machine learning model and dynamic health index evaluation. The method can significantly improve the safety and reliability of the carbon sequestration system, and is suitable for large-scale geological sequestration engineering.

The invention discloses a geothermal development oil shale and CO2 geological storage integrated method, which relates to the field of complex oil and gas reservoir development, and comprises the following steps: designing U-shaped well process parameters, enabling CO2 fluid to flow to a high-temperature geothermal reservoir through a descending section of a U-shaped well, injecting the CO2 fluid into the oil shale reservoir along an ascending section of a shaft after sufficient heat exchange, preheating the oil shale, and storing the CO2 fluid into a high-temperature geothermal reservoir through the descending section of the U-shaped well. Terrestrial heat extraction and utilization are realized; after the temperature of the oil shale layer rises to the target temperature, the oil shale layer is further heated through manual heating, and in-situ conversion development of the oil shale is achieved; after completion, produced CO2 is injected into the oil shale layer again through the U-shaped well, and collaborative development of CO2 geological storage, geothermal extraction and oil shale in-situ conversion is achieved. Geothermal energy is efficiently extracted through CO2 and used for oil shale in-situ pyrolysis, the extra manual heating cost needed by oil shale in-situ conversion is remarkably reduced, and the economic feasibility of a pure storage project and oil shale in-situ conversion development is improved.

The invention discloses a CO2 geological storage coordinated shale oil and geothermal energy green development system and method. The system comprises a geothermal power station located on the ground, a ground cable, a CO2 injection device, a CO2 conveying pipeline, a CO2 / shale oil separation device, a shale oil conveying pipeline and a shale oil storage tank. Wherein the geothermal power station is connected with the CO2 injection device through a ground cable, the CO2 injection device is connected with the CO2 / shale oil separation device through a CO2 conveying pipeline, and the CO2 / shale oil separation device is connected with the shale oil storage tank through a shale oil conveying pipeline; through multiple utilization and innovative closed circulation of CO2, an efficient energy development system is built, the recovery ratio of shale oil is increased, geological storage of CO2 and geothermal energy development are achieved, energy consumption and carbon emission are reduced, and therefore the environmental pollution risk is effectively reduced, and unification of economic benefits and environmental benefits is achieved.

The invention belongs to the technical field of oil and gas field development, and particularly relates to a method for simultaneously evaluating shale oil reservoir CO2 diffusion characteristics and storage states and an experimental device thereof. The method comprises the steps that firstly, a sampled shale core is subjected to artificial fracture forming, and the basic physical property of the shale core is measured; sequentially saturating formation water and oil; obtaining T1 and T2 maps of the shale core by utilizing nuclear magnetic resonance; and finally, according to corresponding formulas, calculating the effective diffusion coefficient De of the CO2, the storage rate of the CO2, the proportion of the structural storage form and the dissolution storage form of the CO2, and the proportion of the adsorption storage form and the free storage form in the structural storage form. According to the method, experimental mechanism evaluation can be carried out on the shale oil reservoir CO2 diffusion mechanism and the storage state under pressure driving, the diffusion characteristics and the storage state of CO2 in the shale development process are determined, and reliable technical support and theoretical basis are provided for efficient development of shale oil and geological storage of CO2.

The invention discloses a land sedimentary basin salt water layer carbon dioxide geological storage site selection method comprising the following steps: carrying out geological exploration in a to-be-stored area, and delineating a storage prospective area; geological exploration is carried out in the sequestration distant view area, a trap structure and geological conditions beneficial to carbon dioxide sequestration are found, and a sequestration target area is delineated through pre-exploration well drilling in combination with important mineral resource exploration development conditions and carbon dioxide sequestration and mineral resource development configuration; geological exploration is carried out in a storage target area, supplementary drilling is carried out under the conditions of shaft corrosion prevention and leakage, carbon dioxide storage and mineral resource development are configured to avoid the risk of carbon dioxide leakage caused by mineral resource development and abandoned drilling by combining important mineral resource exploration and development conditions, and a storage site is delineated; determining a carbon dioxide injection layer; and sealing site selection is completed. According to the method, a proper sealing site can be screened for large-scale safe carbon dioxide sealing for the salt water layer of the sedimentary basin, and the sealing effect is ensured.

The invention provides a dynamic visual simulation system and method for carbon dioxide formation water reaction precipitation, and belongs to the technical field of geological sequestration. The dynamic visual simulation system and method for the carbon dioxide formation water reaction precipitation comprise a microcosmic etching chip model; a piston container; the pressure-making injection system is connected with the piston container; a carbon dioxide liquefaction module; the carbon dioxide quantitative injection system is connected with the carbon dioxide liquefaction module; the supercritical generator is connected to the downstream of the carbon dioxide quantitative injection system; a microscopic etching chip model is arranged in the visual reaction kettle, and the visual reaction kettle is connected with the supercritical generator; the back pressure loading system is connected to the outlet end of the visual reaction kettle; the microscopic image visual acquisition module is arranged above the visual reaction kettle; an annular pressure tracking pump; the control terminal computer is connected with all the modules, and the problems that the influence rule of sediment on reservoir seepage in carbon dioxide geological sequestration is unclear, and sequestration risks are difficult to predict are solved.

The invention belongs to the technical field of carbon dioxide capture and utilization and geological sequestration, and discloses a numerical simulation method for migration of CO2 in stratum.The method comprises the steps that an actual stratum complex geological model is constructed, and then a numerical simulation model is obtained; finely adjusting the numerical simulation model to limit fluid channeling and external substance and energy exchange, and ensuring rapid convergence of operation; the injection of CO2 in different layers is simulated, and the influence of the injection layers on the migration law is analyzed; cO2 injection at different injection speeds and temperatures is simulated to analyze the influence of the injection speeds and temperatures on the migration law; cO2 is simulated to be injected at different injection temperatures under the condition of consistent initial salt concentration, and the influence of dissolved salt on migration and dissolution rules is analyzed; the injection of CO2 at different positions of the reservoir is simulated, and the influence of the injection well position on CO2 storage is analyzed; and optimizing well position arrangement to obtain an optimal well pattern scheme. According to the method, the results of various influence factors are comprehensively analyzed, and then the migration rule of CO2 in the stratum is accurately obtained.

The invention discloses a coal-series gas yield increasing and CO2 geological sequestration integrated simulation method and system, and relates to the technical field of gas exploitation of each layer, and the method comprises the following specific steps: building a geological model representing a multi-lithology superposed coal-series reservoir; the coal series reservoir is a heterogeneous reservoir and comprises shale, a coal seam and sandstone, the shale and the coal seam are double-hole double-permeability media, and the sandstone is a single-hole single-permeability medium; based on the geologic model, establishing a multi-physical field coupling model of a coupling temperature field, a seepage field and a stress field; performing discretization solution on the multi-physics field coupling model to obtain a numerical simulation result; constructing a numerical model, and performing inversion correction on model parameters of the numerical model based on experimental data and the numerical simulation result; and utilizing the corrected numerical model to simulate different injection-production working conditions so as to carry out double-target evaluation and scheme optimization of coal-series gas yield increase and CO2 geological sequestration. The method provides a reliable decision basis for engineering scheme design.

The invention relates to a method and a device for determining the flow characteristic of CO2 in a porous medium and the distribution rule of CH4 in a pore space. The method comprises the following steps: (1) pretreating a sample; (2) system connection and air tightness inspection; (3) vacuumizing the system; (4) temperature control; (5) CH4 saturation and pressure stabilization; (6) displacement experiment and data acquisition; (7) monitoring outlet gas; and (8) data processing. The problem that in existing CO2 geological sequestration and enhanced gas production research, due to the fact that in-situ visualization of the pore size cannot be achieved, a microscopic displacement mechanism is unclear is solved, and the method aims at providing scientific basis and technical support for efficient exploitation of natural gas and effective geological sequestration of CO2.

The invention discloses a method for simulating and calculating the CO2 burying rate of an exhausted gas reservoir, which comprises the following steps: S1, acquiring rock core, formation water, methane and CO2 samples, and measuring the basic physical properties of each sample; s2, under the formation condition, the rock core is saturated with formation water and subjected to methane displacement till no water is discharged; s3, CO2 displacement is conducted on the rock core, and CO2 injection and extraction data in the process are recorded till the depletion state is achieved; s4, under the constant pressure condition, the rock core is subjected to standing treatment, and the basic physical property of the rock core subjected to standing treatment is measured; and S5, establishing a CO2 burying rate calculation model, and calculating the CO2 burying rate in combination with the parameters obtained in the steps. According to the method, the CO2 burying rate can be accurately calculated, and evaluation indexes and references are provided for the safety of CO2 geological storage.

The invention provides a seabed CO2 storage induced fault activation micro-seismic monitoring system and an identification method. The method comprises the following steps: acquiring a data signal in a seabed CO2 injection process; calculating the distance between the monitoring position and the seismic source based on the data signal to locate the seismic source position; obtaining a seismic source moment tensor and a moment magnitude based on the seismic source position, and obtaining a seismic source mechanism solution based on the seismic source moment tensor; taking the seismic source mechanism solution as a clustering parameter, performing spatial clustering analysis on all microseismic events in the seabed CO2 injection process, and obtaining a potential hidden fault corresponding to each cluster; and for all micro-seismic events on each potential hidden fault, magnitude-frequency number linear fitting is carried out based on the moment magnitude, an earthquake b value of seismic activity on the fault surface is obtained, and fault activation is identified based on the earthquake b value. According to the invention, real-time monitoring of the fault state in seabed CO2 geological sequestration can be realized, and possible fault activation can be identified.

According to the carbon dioxide concentration detection device based on optical fiber sensing and the storage monitoring system provided by the invention, the first optical fiber sensing unit with a modular structure is designed, so that the contact part of the sensitive coating and the optical fiber Bragg grating can be independently maintained and replaced, and the optical fiber reflection wavelength drift caused by the CO2 concentration change in the environment can be accurately detected. Meanwhile, a fiber bragg grating which is not covered with a CO2 sensitive coating is arranged as a reference, and wavelength drift mainly generated by environmental interference factors is detected. The influence of environmental interference factors on the wavelength drift of the CO2 optical fiber sensor can be eliminated by calculating the wavelength drift distance of the two fiber bragg gratings and combining the mathematical model of the wavelength drift distance and the CO2 concentration, and then the accurate CO2 concentration value is obtained. According to the invention, high-efficiency real-time monitoring of CO2 concentration in the geological storage process of CO2 is realized, and data accuracy and reliability are ensured. Moreover, the modular design facilitates the regular inspection and replacement of the sensor, prolongs the service life, reduces the maintenance cost, and is high in sensitivity, strong in stability, and good in maintainability.

The invention provides a carbon dioxide geological sequestration injection strategy optimization method and device. The method comprises the steps that candidate injection curves of different forms of carbon dioxide injection rates and time change relations of a target sequestration site are obtained; each candidate injection curve represents an injection strategy; inputting the time sequence data and the reservoir state query information corresponding to each candidate injection curve into the trained agent model to obtain a prediction index corresponding to the reservoir state query information; and determining a target injection strategy corresponding to the target candidate injection curve based on the prediction index corresponding to the reservoir state query information and the target index evaluation condition. According to the method, the maximization of the sealing injection efficiency and the accumulative sealing amount is realized on the premise of ensuring the reservoir pressure safety.

The invention discloses a carbon dioxide geological sequestration leakage monitoring and early warning system. The system comprises a sensor arrangement module, a data acquisition and processing module, a prediction and early warning module and a linkage control module. The sensor laying module is used for laying pressure sensors, temperature sensors and microseism monitoring equipment on an injection well, a monitoring well and the ground surface, and real-time collection of pressure and temperature of a reservoir and a shaft is achieved by combining distributed optical fiber temperature measurement. And the data acquisition and processing module performs dynamic fitting and trend analysis on the multi-source monitoring data, and calculates to obtain a pressure evolution function. The prediction and early warning module predicts a future pressure state through a threshold value judgment and prediction model and automatically sends out an early warning signal when the future pressure state is close to a critical value, the linkage control module is combined with the injection control unit, the injection rate can be automatically adjusted or adjusted in an auxiliary mode according to an early warning result, risks are reduced, and safety is improved. The system can significantly improve the safety and reliability of carbon dioxide geological sequestration.

An experimental device for the impact of carbon dioxide geological storage on fault stability, comprising a fault simulation specimen and a true triaxial stress loading system, a liquid carbon dioxide injection system, a temperature loading system, an acoustic emission monitoring system, a gas concentration monitoring system, a stress and deformation monitoring system, a temperature monitoring system, and a fluid pressure monitoring system, which are respectively connected to the fault simulation specimen. The experimental method for evaluating the fault instability induced by carbon dioxide geological storage includes the steps of preparing the fault simulation specimen, building the experimental equipment, loading the experimental conditions and collecting data, calculating the stress, and analyzing the mechanism of fault instability induced by carbon dioxide storage. The present invention relates to the technical field of fault stability evaluation and carbon storage experiments, and can provide data support for improving the effect of carbon dioxide geological storage through simulation experiments.

According to the coal in-situ fluidized mining method based on the radio frequency heating technology, after coal seam parameters are determined through geological exploration, an L-shaped heating well is arranged in the middle of a coal seam, an L-shaped production well is arranged on the top of the coal seam, and a high-permeability fracture network is constructed by adopting a liquid CO2 high-pressure fracturing technology. And then deploying a radio frequency heating device in the heating well, and promoting in-situ pyrolysis and gasification of the coal seam to generate raw gas such as CH4 and CO by accurately regulating and controlling power and frequency. According to the coal in-situ fluidization mining method, through the synergistic effect of'fracturing-supporting-radio frequency excitation ', continuous conversion of coal solid-state energy to flow-state energy and direct extraction of gas-state products by the production well are achieved, the functions of efficient mining and CO2 geological storage are achieved, environmental damage and safety risks generated by traditional mining are remarkably reduced, and the coal in-situ fluidization mining method is suitable for industrial production. And an innovative path is provided for green development of coal resources.

The invention relates to the technical field of geological sequestration, in particular to a geological sequestration reaction simulation method and device based on a basalt layer, and the method comprises the steps: obtaining a basalt layer sample and geological parameters of a target area; the method comprises the following steps: placing basalt layer samples in a reaction device layer by layer, arranging a plurality of horizontal porous injection pipelines between layers, and loading triaxial stress to simulate underground rock stratum constraint of a target area; based on geological parameters, constructing an axial temperature gradient and a water confining pressure gradient in the reaction device; injecting a target gas fluid into the basalt layer sample by using a horizontal porous injection pipeline according to a preset sealing angle; monitoring the seepage parameters of the target gas fluid and the relevant parameters of the basalt layer sample in real time, and evaluating the carbonization rate at different preset sealing angles. The objective of the invention is to solve the problem of experimental simulation effectiveness under the geological sequestration horizontal injection condition of the basalt layer, realize geological sequestration efficiency evaluation and provide reliable data for improving the geological sequestration efficiency.

Disclosed in the present application are a method for determining the fault sealing capacity of CO2 geological storage, and a related apparatus. The method specifically comprises: determining whether the lithology of a caprock corresponding to a reservoir consisting of CO2 satisfies preset conditions, the preset conditions comprising that the lithology is shale, and the proportion of clay minerals satisfies a preset range; when the lithology of the caprock does not satisfy the preset conditions, calculating a displacement pressure difference between the reservoir and a fault formed between the caprock and the reservoir; and when the displacement pressure difference is not greater than zero, determining a caprock thickness, a reservoir thickness and a fault displacement on the basis of a fault profile diagram; and, on the basis of a numerical value sorting relationship of the caprock thickness, the reservoir thickness and the fault displacement, determining the fault sealing capacity of CO2 geological storage, the fault sealing capacity comprising: a fault being completely sealed, a fault being partially sealed and a fault being unsealed. Therefore, the present application finally determines the fault sealing capacity of the CO2 geological storage.

The invention discloses a saline water layer CO2 geological storage salting-out quantitative evaluation device and method. The saline water layer CO2 geological storage salting-out quantitative evaluation device comprises a fluid injection system, a rock core reaction system, a confining pressure system, a back pressure system, a pulse measurement system, a drainage system and a data analysis system. The fluid injection system, the confining pressure system, the back pressure system and the liquid drainage system are respectively communicated with the rock core reaction system, and the pulse measurement system and the data analysis system are respectively and electrically connected with the rock core reaction system. According to the embodiment of the invention, the rock core reaction system provides an experiment environment, the fluid injection system provides scCO2 and saline water required by an experiment, the pulse measurement system provides a sound wave signal for a rock sample, and the data analysis system analyzes various data acquired by the experiment and obtains a saline water layer CO2 geological storage salting-out quantitative evaluation result. And a scientific basis is provided for an injection process and storage safety of geological storage of CO2.

The invention relates to the technical field of carbon dioxide geological sequestration, and particularly discloses a full-well-section phase state monitoring method and device in a carbon dioxide geological sequestration wellbore, the device comprises an underground monitoring system and a ground acquisition system, and temperature distribution of a full well section and strain distribution of an oil pipe can be obtained; calculating the carbon dioxide pressure distribution of the whole well section according to the strain distribution of the oil pipe, and associating the phase state of each depth position with the space coordinate of the shaft by combining the carbon dioxide phase state diagram to obtain the carbon dioxide phase state distribution diagram of the whole well section. According to the invention, continuous and high-precision monitoring can be carried out on the carbon dioxide phase change in the carbon dioxide injection process, and a key technical support is provided for geological sequestration safety and efficiency evaluation.

The conveying and injecting system comprises a main pipeline, a cooling device and a supercharging device, the main pipeline is used for receiving supercritical carbon dioxide from a carbon dioxide capturing device, and the other end of the main pipeline is connected with an inlet of the cooling device; the cooling device is used for cooling the supercritical carbon dioxide to a preset temperature, so that the supercritical carbon dioxide is converted into dense-phase carbon dioxide, an outlet of the cooling device is connected with an inlet of the pressurizing device, an outlet of the pressurizing device is used for being connected with an injection well, and the pressurizing device is used for pressurizing the dense-phase carbon dioxide to a preset pressure. According to the conveying and injecting system, carbon dioxide is conveyed to the vicinity of a sealing place in a supercritical phase state in a long distance in the main pipeline and then conveyed to the injecting well after being cooled and pressurized, and the pressure of supercritical carbon dioxide is smaller than that of dense-phase carbon dioxide, so that the risk that the main pipeline is broken can be reduced; and the stability and safety of carbon dioxide conveying are improved.

The invention provides a carbon dioxide geological sequestration assessment method and device based on fluid-solid coupling, and the method comprises the steps: generating a seepage simulation grid based on the collected field survey geological data of a target sequestration site; the simulation parameters corresponding to the seepage simulation grids in the current time period are input into a multiphase flow simulation tool, and seepage field data corresponding to the seepage simulation grids in the future time period are obtained; inputting pore pressure data and temperature in the seepage field data corresponding to each seepage simulation grid in the future time period into a solid mechanical simulator to obtain reservoir deformation data in the corresponding mechanical calculation grid in the future time period; and based on the seepage field data and the reservoir deformation data, generating evaluation information of the carbon dioxide geological sequestration. According to the method, the sealing safety and the reliability of efficiency evaluation are improved by utilizing a carbon dioxide sealing multi-physical field simulation technology coupled by a multiphase flow simulation tool and a solid mechanical simulator.

The invention discloses a carbon sequestration efficiency influence factor determination method, and the method comprises the steps: determining a plurality of rock samples to be processed; determining respective carbon sequestration amounts of the plurality of rock samples; wherein the carbon sequestration amount refers to the amount of carbon dioxide stored in the rock sample after the rock sample is subjected to carbon sequestration treatment; based on the respective carbon sequestration amounts of the plurality of rock samples, determining carbon sequestration efficiencies respectively corresponding to the plurality of rock samples; and analyzing the carbon sequestration efficiency corresponding to the plurality of rock samples, and determining the carbon sequestration efficiency influence factor of the rock. By analyzing the carbon sequestration efficiency, a key bottleneck limiting the carbon sequestration capacity can be found out, the mineralization sequestration efficiency of basalt is improved, and a scientific basis is provided for optimizing geological sequestration conditions.