23 results about "Underground gas storage" patented technology

The present application relates to the technical field of underground gas storage, and discloses a double-layer sealing structure for underground gas storage, a design method and a construction method thereof. In the double-layer sealing structure, a complete closed shell is formed by on-site roll bending and continuous welding of a high-elastic steel plate, and together with a sliding layer, forms an overall sealing system without joints and weak links. Compared with the traditional block lining or the scheme of setting expansion joints, the leakage hidden danger caused by stress concentration or material aging at the joints or joints is completely avoided, and the long-term gas-tight reliability of the gas storage under the repeated action of high internal pressure is improved. At the same time, the sliding layer is made of flexible material, which can effectively absorb the displacement and cracking deformation of the surrounding rock caused by pressure change, and uniformly transmit the deformation to the high-elastic steel sealing layer, so that the sealing structure can be transformed from passive adaptation to active adaptation, avoiding stress concentration and crack propagation caused by deformation incoordination of the traditional rigid lining, thereby preventing the sealing layer from being torn or pierced.

This specification relates to the field of compressed air energy storage technology, specifically disclosing a condition monitoring system and method for underground gas storage facilities. The system includes: an acoustic monitoring well located in the upper part of the underground gas storage facility, equipped with a multi-component shear wave detector for acquiring creep or deformation monitoring data of the roof and surrounding rock; a microseismic monitoring well located in the lower part of the underground gas storage facility, equipped with an underground microseismic detector array for acquiring rupture event monitoring data of the surrounding rock; a fault leakage monitoring device, including a tracer gas injector and a tracer gas detection mechanism, for acquiring surface gas concentration monitoring data; and a data processing device connected to a multi-dimensional monitoring network for performing spatiotemporal correlation and cross-validation analysis on the received multi-dimensional monitoring data to generate a fusion assessment result of the structural integrity status and sealing safety risk of the underground gas storage facility. The above solution enables high-precision monitoring and assessment of underground gas storage facilities.

This invention provides a system and method for evaluating and screening underground gas storage sites based on a B / S architecture. The system is built on a B / S architecture, where the gas storage site evaluation index management module and the gas storage site evaluation and screening function module generate function form operation instructions corresponding to functional requirements through a browser, and send the corresponding HTTP requests to a web server. After responding to the requests from the browser, the web server sends database access requests corresponding to the function form operation instructions to a database server. The database server receives and processes the database access requests, and then returns the matching results to the web server. Collaboratively, the system calculates the evaluation results for the sites to be evaluated based on current indicators and indicator standards, including the evaluation score for each site and the corresponding screening results. This approach overcomes the problems of complex calculations and limited application in existing technologies, achieving reliable site evaluation and screening with rapid deployment, installation, and configuration.

The application discloses a kind of underground gas storage surrounding rock yield discrimination method and terminal equipment, belong to underground gas storage technical field, can solve the problem that existing method is difficult to accurately describe the yield behavior of surrounding rock.The method comprises the following steps: S1, according to the plastic strain parameter of surrounding rock, surrounding rock stress and kinematic hardening stress, the yield function of surrounding rock is constructed;S2, according to the plastic potential function of surrounding rock stress, and the first relationship between plastic potential function and plastic strain parameter, and the second relationship between plastic strain parameter and surrounding rock stress is constructed;S3, according to the last surrounding rock stress, plastic potential function, first relationship and second relationship, determine the current surrounding rock stress of underground gas storage and current plastic strain parameter;S4, according to the current surrounding rock stress, current plastic strain parameter, current kinematic hardening stress and yield function determine the yield state of surrounding rock of underground gas storage after current pressure change.The application is used for surrounding rock yield discrimination.

The application discloses a kind of low permeability reservoir underground gas storage multi-cycle injection-production condition under the prediction method of effective reservoir capacity boundary dynamic evolution, and the application is based on injection-production intensity driving seepage parameter self-adaptive evolution under the condition of low permeability reservoir underground gas storage multi-cycle strong injection and strong production, and the effective reservoir capacity boundary is dynamically predicted, to solve the systematic overestimation problem caused by parameter static, threshold effect neglect and connectivity loss in the effective reservoir capacity boundary prediction of low permeability reservoir underground gas storage under the condition of multi-cycle strong injection and strong production. Realize: the effective reservoir capacity boundary of injection stage and production stage is predicted respectively;Seepage parameter self-adaptive evolution with cycle and injection-production system intensity, not dependent on field testing / monitoring data;Through threshold-conductivity-connectivity accessibility triple criterion, the effective reservoir capacity boundary meeting engineering definition is obtained.

This invention relates to the field of gas storage management technology, and provides a method and apparatus for determining the number of injection wells during the injection phase of an underground gas storage facility. The method includes: constructing a correlation between average formation pressure and reasonable injection volume for different pipe diameters based on dynamic curves of gas inflow and outflow; determining the correlation between average formation pressure and cumulative injection volume; determining the average formation pressure based on planned injection time, injection volume per unit time, and the correlation between average formation pressure and cumulative injection volume; determining the reasonable injection volume based on the correlation between average formation pressure and reasonable injection volume; and determining the number of injection wells based on the reasonable injection volume and injection capacity. This ensures efficient injection of gas from pipelines into the underground gas storage facility, while preventing high-speed injection-production rates from damaging the reservoir, thus ensuring the safety of gas storage and providing guidance for planning the gas injection work schedule during the injection phase.

This invention relates to the field of underground gas storage technology for compressed air energy storage power stations, specifically to a large-size sealed door structure for high-pressure underground gas storage. It includes a sealed door, a sealing ring fixing steel plate, a first sealing ring, and a second sealing ring. A maintenance passage is provided inside a reinforced concrete plug. The sealed door is connected to the reinforced concrete plug via a sealing door support hinge. The maintenance passage is connected to the gas storage through the sealed door. The sealing ring fixing steel plate is fixed between the sealed door and the reinforced concrete plug. Both the first and second sealing rings are interference-fitted between the sealing ring fixing steel plate and the sealed door, with the first sealing ring positioned outside the second sealing ring. The sealed door structure is simple, adaptable to complex operating conditions, and ensures durability and reliability. It employs conventional sealing methods to form two seals, creating a double-layered protective barrier, resulting in good sealing performance, simple maintenance, and low repair costs.

This invention provides an integrated monitoring and early warning method and system for underground gas storage facilities, belonging to the field of energy storage safety monitoring technology. The method includes: collecting multi-dimensional monitoring data from the ground, air, and wellbore, comprising eight modules: surface wellhead pressure and temperature, surface subsidence, well site leakage, oil-gas-water interface, wellbore leakage, tracer data, microseismic data, and UAV inspection data; standardizing and preprocessing the multi-source heterogeneous data; constructing a dynamic spatiotemporal graph with monitoring points as nodes and spatiotemporal correlations as edges; extracting multi-scale features using convolutional neural networks and graph convolutional networks; achieving deep cross-fusion of features using a cross-modal attention mechanism; simultaneously assessing wellbore integrity, reservoir stability, and leakage risk through multi-task collaborative learning to generate a comprehensive risk value; and classifying early warning into low, medium, and high levels based on risk thresholds. This significantly improves the accuracy and real-time performance of early warnings, effectively ensuring the safe operation of underground gas storage facilities.

The application discloses a pressure self-balancing water-steel double-sealing underground gas storage, and relates to the technical field of underground energy storage. The underground gas storage comprises a main body, a gas injection and extraction pipeline, a gas discharge pipeline and a gas injection and discharge water pipeline. The main body comprises, from outside to inside, a lining layer, a water sealing layer, a steel plate sealing layer and an inner chamber. The water sealing layer is communicated with the inner chamber through a pressure balance port. The gas injection and extraction pipeline is communicated with the inner chamber after penetrating the surrounding rock, the lining layer, the water sealing layer and the steel plate sealing layer in sequence. Compared with the conventional artificial chamber gas storage adopting a single-layer steel plate sealing or a steel plate composite sealing structure, the water-steel double-sealing underground gas storage adopts a double-layer sealing structure of the water sealing layer and the steel plate sealing layer, solves the problems of the overall failure of the gas storage or the increase of the leakage amount caused by the leakage of the steel plate sealing layer, and effectively improves the gas tightness of the gas storage. The application also relates to an operation method of the pressure self-balancing water-steel double-sealing underground gas storage.

The application provides a high-temperature well cementing high-toughness micro-expansion cement slurry, which comprises the following raw materials in parts by weight: G-grade oil well cement 60-90 parts by weight, active material 20-40 parts by weight, high-performance toughening agent 3-12 parts by weight, nano oxide 3-10 parts by weight, expansion agent 0.5-5 parts by weight, chemical activator 3-5 parts by weight, high-temperature fluid loss additive 1-3 parts by weight, high-temperature retarder 0.5-3 parts by weight, dispersing agent 0.1-1 parts by weight, and defoaming agent 0.2-1 parts by weight. By adding the active material, the high-performance toughening agent, the nano oxide and the expansion agent, the high-temperature resistance, the toughness of the cement slurry and the cementing quality of the cement sheath are improved; the four components jointly improve the high-temperature resistance, the toughness and the cementing performance of the surrounding rock interface of the cement; and by being used in cooperation with other components, the cement slurry has the advantages of good stability, small fluid loss and good rheological property, is suitable for well cementing of underground gas storage, can improve the well cementing quality of the formation sealing section, and guarantees the cement sheath sealing integrity under frequent injection and production.

This invention provides a method for treating unfavorable geological sections in underground gas storage facilities. The treatment structure includes replacement concrete placed between a weak structural layer and backfill concrete. The replacement concrete has an isosceles trapezoidal cross-section in the radial direction of the gas storage facility. The upper base of the isosceles trapezoid is connected to the weak structural layer, the lower base is connected to the backfill concrete, and the two side edges are connected to the surrounding rock on both sides of the replacement concrete. The length of the upper base is... L 3 is less than the length of the lower base. L 1. The processing structure of the present invention can prevent the weak structural layer from causing safety problems to the gas storage facility due to its low strength and easy deformation.

The application discloses a kind of gas storage injection and production hydrogen sulfide content variation prediction method and related device, belong to underground gas storage technical field;The method first according to the total amount of hydrogen sulfide in natural gas before gas storage and the gas injection amount of the first cycle of gas storage, determine the total amount of hydrogen sulfide after the first cycle injection of gas storage;Then based on linear gradient, establish hydrogen sulfide content mixed linear distribution model, predict the total amount of hydrogen sulfide in the first cycle produced gas and hydrogen sulfide content;In turn, the average content of hydrogen sulfide in each cycle produced gas is calculated by hydrogen sulfide content mixed linear distribution model, and the hydrogen sulfide content variation curve of each cycle is drawn.The method of the present application needs less basic data for prediction, can more accurately predict the total amount of hydrogen sulfide in each cycle produced gas and content, thereby improving the accuracy of hydrogen sulfide content prediction.

This invention discloses a semi-analytical method for predicting the temperature distribution of gas-injected reservoirs in underground gas storage facilities. The method includes: establishing a caprock heat transfer model for the underground gas storage facility; performing a Laplace transform based on initial conditions; and calculating the temperature at the interface between the caprock and reservoir based on inner and outer boundary conditions. Under a constant gas injection mass flow rate, the method establishes and simplifies the reservoir energy balance equation by considering convective heat transfer and throttling effects, caprock heat transfer, and thermal conductivity of the internal rock skeleton of the reservoir. The simplified reservoir energy balance equation is then subjected to a Laplace transform to calculate the Laplace space solution of the reservoir temperature distribution, and the reservoir temperature distribution is obtained through Laplace numerical inversion. This invention considers the unstable thermal conductivity of the upper and lower caprocks using a linear heat flow model, and considers radial convective heat transfer and the Joule-Thomson effect near the wellbore within the reservoir, forming a Laplace space solution for the reservoir temperature distribution under gas injection conditions. This method can quickly predict the temperature distribution patterns of underground gas storage facilities.

An underground gas storage device includes an underground gas storage chamber, which is formed by multiple segments. A connecting passage is provided between two non-adjacent segments. On the outer top wall of the connecting passage is a shaft. At the intersection of the shaft and the connecting passage is a sealing plug. An inlet pipe and an outlet pipe are provided within the shaft. An outer bottom wall of the connecting passage is provided with a sump. A first drainage ditch is arranged along the circumference of the top edge of the sealing plug. The first drainage ditch communicates with the sump. On the outer surface of the segments is a drainage blind pipe assembly. The drainage blind pipe assembly communicates with the sump. The present invention allows for excavation in one go, reducing construction difficulty, and effectively minimizes the impact of groundwater on the underground gas storage chamber.

The application provides a recessed framework, a sealed lining structure, an underground gas storage and a construction method, and belongs to the technical field of compressed air energy storage. The recessed framework comprises a fixed bottom plate, the fixed bottom plate has a length direction and a width direction, the fixed bottom plate is formed with a clamping opening with a semi-open containing space at the middle axis along the length direction, the top edge of at least one side of the clamping opening with the semi-open containing space extends inward to form a protrusion, so that the inner side corresponding to the protrusion in the clamping opening with the semi-open containing space forms a recess, and the protrusion and the recess jointly form a limiting groove. The sealed lining structure comprises an airtight layer and the recessed framework. The underground gas storage comprises a concrete lining layer and the sealed lining structure, and the sealed lining structure is fixedly arranged on the inner wall of the concrete lining layer through the recessed framework. The recessed framework can be combined to form the sealed lining structure, and the underground gas storage is formed, the construction period is shorter than that of the welded steel plate, and the cost is lower.

The present disclosure relates to hydrogen swellable fillers, methods for their preparation and their use in, for example, oil-field exploration, production, testing, underground gas storage, production and transportation. The hydrogen swellable material can include an elastomer and a filler. The elastomer can have a hardness between about 40 and about 80 shore A, and the hydrogen swellable material swells in volume between about 40% and about 100% upon contact with hydrogen.

This invention discloses a method and terminal equipment for determining the yielding behavior of surrounding rock in underground gas storage facilities, belonging to the technical field of underground gas storage facilities. It solves the problem that existing methods are insufficient to accurately describe the yielding behavior of surrounding rock. The method includes: S1, constructing a yield function of the surrounding rock based on its plastic strain parameters, stress, and kinematic hardening stress; S2, constructing a plastic potential function based on the surrounding rock stress, and establishing a first relationship between the plastic potential function and the plastic strain parameters, and a second relationship between the plastic strain parameters and the surrounding rock stress; S3, determining the current surrounding rock stress and plastic strain parameters of the underground gas storage facility based on the previous surrounding rock stress, plastic potential function, the first relationship, and the second relationship; S4, determining the yielding state of the surrounding rock of the underground gas storage facility after the current gas pressure change based on the current surrounding rock stress, current plastic strain parameters, current kinematic hardening stress, and yield function. This invention is used for determining the yielding behavior of surrounding rock.

The application discloses an annular support structure of an underground gas storage and a construction method, relates to the technical field of underground high-pressure gas storage, and the annular support structure comprises a concrete lining layer, a sealing layer and a partition piece, the concrete lining layer is provided with a plurality of gaps in the annular direction, the plane where the annular direction is located is perpendicular to the extension direction of the gas storage, the sealing layer is at least partially attached to the concrete lining layer, the sealing layer is provided with elastic buffer parts corresponding to the gaps in the annular direction, and the partition piece is connected with the concrete lining layer at two ends in the width direction of the gap. The elastic buffer part is protruded in the direction away from the concrete lining layer, and a containing cavity is formed between the elastic buffer part and the concrete lining layer, the containing cavity is used for containing buffer material, and the partition piece is configured to prevent the buffer material from leaking through the gap. The scheme can improve the reliability of the annular support structure.

The application discloses a method for determining the minimum buried depth of a compressed energy storage underground gas storage, comprising the following steps: setting basic parameters of the compressed energy storage underground gas storage according to geological data of rock and volume requirements of the gas storage; considering factors of gas storage pressure, rock gravity, shear strength of surrounding rock and broken surface of the surrounding rock under pressure, establishing a vertical mechanical equation of the gas storage by adopting a conical body model, and obtaining a vertical buried depth capable of meeting maximum gas storage pressure requirements; and establishing a horizontal mechanical equation of the gas storage according to the basic parameters and the vertical buried depth of the gas storage, and obtaining a horizontal buried depth capable of meeting the maximum gas storage pressure requirements. Whether the vertical buried depth of the gas storage meets the limit inflation pressure is determined first, and then the horizontal broken surface mechanical equation is substituted into the horizontal buried depth on the basis of the vertical buried depth, so as to determine whether the horizontal buried depth meets the limit inflation pressure. The calculation method is simple, fast, accurate, and has good economic applicability.

The application discloses a kind of compressed air energy storage underground chamber stability and sealing comprehensive evaluation method and system based on multi-index monitoring, belong to compressed air energy storage and underground engineering safety monitoring technical field.The present application is aimed at the problems such as single index of existing evaluation system, poor environmental adaptability, construct multi-dimensional monitoring system including stability index (surrounding rock displacement rate, lining stress amplitude etc.), sealing index (short-term pressure drop rate, cumulative leakage rate etc.) and coupling correction index, through multi-source data acquisition preprocessing, hierarchical weight distribution and neural network fusion model, calculate comprehensive evaluation index to divide operation state grade.The present application realizes the comprehensive perception and accurate evaluation of underground chamber operation state, helps to improve the accuracy of abnormal identification, can directly guide the construction of field monitoring system, significantly reduces operation and maintenance cost, and is suitable for salt cave, artificial rock cave and other types of underground gas storage structure.

The application discloses a kind of underground high-pressure cavern structures based on joint stress and construction method thereof, belong to energy storage system technical field, can solve the problem of existing including compressed air energy storage underground high-pressure cavern and water passing high-pressure tunnel etc. in the process of storing and releasing energy, supporting effect is weak, the problem of low utilization efficiency of deep surrounding rock. The structure includes: cavern surrounding rock, including excavation formed loose circle and deep surrounding rock located outside the loose circle;Multiple pressure transmission anchor rods, one end is provided with a pressure receiving end plate, the other end is provided with an anchor head plate;The one end of pressure transmission anchor rod with pressure receiving end plate is placed in deep surrounding rock;Grouting layer is arranged inside the loose circle;Lining layer is arranged inside the grouting layer;Anchor head plate is placed in the lining layer.The application is suitable for underground gas storage and other water passing high-pressure tunnels.

The application relates to the technical field of gas storage management and control, and provides a method and device for determining the number of gas production wells in the gas production stage of an underground gas storage, which comprises the following steps: constructing the corresponding relationship between the average formation pressure and the reasonable gas production amount under different pipe diameters according to the gas production inflow dynamic curve and the gas production outflow dynamic curve; determining the corresponding relationship between the average formation pressure and the cumulative gas production amount; determining the average formation pressure according to the planned gas production time, the gas production amount per unit time, the average formation pressure and the corresponding relationship between the average formation pressure and the cumulative gas production amount, and determining the reasonable gas production amount according to the average formation pressure and the corresponding relationship between the average formation pressure and the reasonable gas production amount; and determining the number of gas production wells according to the reasonable gas production amount and the working gas amount. The method can guarantee that the peak regulation function of the gas storage is maximally exerted and provide guidance for planning the gas production work system in the gas production stage.