130 results about "Underground gas storage" patented technology

The invention belongs to the technical field of geological energy storage, and particularly provides an underground chamber surrounding rock thermal-mechanical coupling fatigue phase field simulation method and system, and the method comprises the steps: building a phase field evolution equation through a phase field fracture model and a fatigue degradation function; on the basis of the calculation model, according to the air temperature and pressure in the cavern, the Newton heat exchange law is adopted to calculate cavern wall heat exchange, and a cavern wall heat conduction equation is constructed; on the basis of the calculation model, utilizing rock mass displacement and surrounding rock strain to construct a rock mass deformation equation; performing numerical discretization on the phase field evolution equation, the cave wall heat conduction equation and the rock mass deformation equation on a finite element grid unit, and performing thermal-mechanical coupling solution on all discretized equations through an iterative method to obtain evolution results of a temperature field, a stress field, a displacement field and a crack phase field of the underground chamber surrounding rock target area. According to the method, the phase field method is applied to thermal-mechanical coupling simulation of the underground gas storage chamber surrounding rock crack propagation condition, and the authenticity of chamber crack simulation is reflected to the maximum extent.

The application provides a kind of stability discrimination method of underground gas storage cavern initial support of compressed air energy storage power station, the method comprises: considering the expansion force and softening of hydrophilic surrounding rock of underground gas storage cavern, draw the response curve of surrounding rock in humidification process;Obtain the supporting parameters of underground gas storage cavern, calculate and draw the characteristic curve of supporting structure;The intersection point of the response curve of surrounding rock and the characteristic curve of supporting structure is determined, and the coordinate of the intersection point is obtained according to the coordinate of the intersection point, and the equilibrium supporting force of hydrophilic surrounding rock and supporting balance is obtained according to the coordinate of the intersection point;According to the safety factor of underground gas storage cavern, the stability of the cavern is judged according to the safety factor.The application fully considers the expansion force, softening and supporting force effect of surrounding rock in the relationship between surrounding rock and support, and uses safety factor as the stability index of underground gas storage cavern, which is suitable for the stability evaluation of underground cavern with complex surrounding rock characteristics, and the discrimination method is accurate and efficient.

The invention is suitable for the field of engineering monitoring, and particularly provides a compressed air energy storage underground gas storage engineering work cave surrounding rock state monitoring system, which comprises a distributed sensing module, which is used for synchronously acquiring multi-source heterogeneous data of surrounding rock and is integrated with a fatigue damage feature extraction unit and a gas leakage source positioning unit; the system further comprises a multi-field coupling data processing module which is used for adjusting a dynamic early warning threshold value based on the operation stage of a target work cave, fusing multi-source heterogeneous data through an improved Kalman filtering algorithm, and correcting error measurement data through a verification model. The system further comprises a multi-model fusion prediction and early warning module, a model dynamic switching unit and an early warning regulation and control linkage unit are built in the multi-model fusion prediction and early warning module, and the model dynamic switching unit is used for self-adaptive switching between the LSTM model and the ELM model; and the early warning regulation and control linkage unit controls the gas storage control system to execute self-adaptive regulation and control of inflation and deflation based on the graded early warning signal. According to the method, the full-life-cycle safety and the risk disposal efficiency of the compressed air energy storage underground gas storage engineering work hole are remarkably improved.

The application discloses a kind of underground gas storage sealing steel plate corrosion monitoring device and method, including ultrasonic probe and processor;Underground gas storage includes tubular sealing steel plate, and ultrasonic probe is installed on the inner side wall of sealing steel plate;Ultrasonic probe includes multiple ultrasonic probe groups spaced along the axial direction of sealing steel plate, each ultrasonic probe group includes multiple ultrasonic probe units spaced along the circumferential direction of sealing steel plate, and processor is electrically connected with each ultrasonic probe unit;Ultrasonic probe unit is configured to receive and send signal.Compared with prior art, the application can realize real-time monitoring and long-term monitoring of the corrosion of the sealing steel plate of underground gas storage, and can determine the corrosion core area and corrosion degree of the sealing steel plate, so as to repair and maintain the corrosion area of the sealing steel plate of the gas storage chamber in a targeted manner, thereby ensuring the safety and stability of the gas storage chamber during operation, continuous detection, low cost, high intelligence and good real-time detection results.

The invention relates to the technical field of rubber vulcanization equipment, in particular to boom equipment and a vulcanization trolley. The boom equipment comprises a boom and connecting equipment. The arm frame is constructed to be installed in the sealing ring layer of the energy storage chamber, and the arm frame can rotate in the sealing ring layer. The connecting device comprises a clamping die, the clamping die is installed at the end of the arm frame, and the clamping die can move in the length direction of the arm frame so that the clamping die can be close to or away from the bent edges of the two adjacent sealing rings in the sealing ring layer. The clamping die is configured to be close to the bent edges of the two adjacent sealing rings and can be connected with the two bent edges when the clamping die is clamped outside the two bent edges. According to the cantilever crane equipment, uneven vulcanization caused by the uneven surface of the secondary lining can be avoided, and the effects that the connection reliability of the sealing ring is remarkably improved, and the sealing performance of the underground gas storage chamber is improved are achieved.

The invention provides a third-stage compression heat recovery device of a compressed air energy storage power station. The third-stage compression heat recovery device comprises a third compressor, a third-stage cooler, an underground gas storage, a gas storage outlet air heating heater, a first-stage expansion gas-water heat exchanger and a first-stage expansion gas molten salt heat exchanger which are sequentially connected according to the air flowing sequence. In the compression process of the first-stage expansion machine, compression heat after a third-stage compressor is stored in a heat storage tank, in the expansion process, the temperature of compressed air at an outlet of an underground gas storage is increased to the designed temperature through heat stored in the heat storage tank, and then the compressed air is heated through a subsequent first-stage expansion gas-water heat exchanger and a first-stage expansion gas-molten salt heat exchanger; and the air inlet temperature requirement of the expander is met. Compression heat of the third-stage compressor is used for heating air at the outlet of the air storage, the compression heat of the third-stage compressor is reasonably utilized, waste of the heat is avoided, the technical problem that the temperature of the air at the outlet of the underground air storage of the compressed air energy storage power station is too low is solved, and the stability of a subsequent heat storage and exchange system and the power generation efficiency of an expansion machine are ensured.

The invention discloses a method and system for evaluating the dynamic brittleness of an underground gas storage, and the method comprises the steps: carrying out an indoor experiment on a cover rock sample, and obtaining a dynamic brittleness-plasticity characteristic containing a rock fatigue damage state; forming a static brittle-plasticity curve based on the logging curve of the sampling well; homing the sampling depth in the static brittle-plasticity curve, and constructing a mathematical correlation model representing two brittle-plasticity relationships through dynamic and static brittle-plasticity characteristics under different sampling depths; based on pre-stack seismic data of the underground gas storage where the sampling well is located, a static brittle-plasticity data body is obtained, and the static brittle-plasticity data body is converted into a dynamic brittle-plasticity data body through the data association model. According to the invention, the three-dimensional dynamic brittle-plasticity attribute of the cap layer can be obtained.

The invention relates to a device and a method for testing cracking and sealing performance of a lining structure under a high internal pressure condition, and belongs to the technical field of compressed air energy storage. The test device comprises a cavern simulation cavity, a rubber capsule, a prefabricated lining device, a high internal pressure loading system and a data acquisition and monitoring system. The rubber bag is arranged in the cavern simulation cavity, the prefabricated lining device is located on the outer side of the rubber bag and comprises a sealing layer and a concrete lining layer, and the high internal pressure loading system communicates with the rubber bag and is used for applying a controllable high internal pressure load into the rubber bag, so that the concrete lining layer cracks under the action of radial internal pressure; and the data acquisition and monitoring system is used for monitoring stress deformation and crack development of the lining layer and the sealing performance of the sealing layer. By means of the testing device and method, the cracking process of the lining of the high-internal-pressure gas storage cavern and the influence of the cracking process on the sealing layer can be simulated, and a testing basis is provided for safety and sealing performance evaluation of the underground gas storage cavern.

The invention relates to the technical field of energy storage, in particular to a compressed air energy storage overground and underground gas storage cooperative control method and device, and the method comprises the steps: collecting operation state parameters of a compressed air energy storage system; based on the operation state parameters, calculating a ratio value of the deflation flow of the overground gas storage and the deflation flow of the underground gas storage, and according to the ratio value, calculating a first adjusting opening degree of a flow adjusting valve of the overground gas storage and a second adjusting opening degree of a flow adjusting valve of the underground gas storage; and the opening degree of the corresponding flow adjusting valve is adjusted based on the first adjusting opening degree and the second adjusting opening degree, so that the inlet pressure of the turbine is maintained within the preset pressure range. Therefore, the problems of sudden pressure drop of a turbine inlet, large gas supply switching impact, poor operation stability and the like caused by independent and sequential gas discharging of the overground gas storage and the underground gas storage in the related technology are solved.

The present application relates to compressed air energy storage technology field, provide a kind of underground gas storage seal steel plate's expansion joint, including sequentially connected first connecting section, expansion section and second connecting section, the expansion section has first end, middle end and tail end, the first end is connected with the first connecting section, the tail end is connected with the second connecting section, the first end to the middle end one section with the tail end to the middle end one section are arc section, at least the expansion section is deformation section. Provide a kind of underground gas storage. Also provide a kind of method for preventing underground gas storage seal steel plate excessive deformation. The present application is under the action of internal pressure, by setting expansion joint, can effectively allow seal steel plate to freely expand and contract with the change of pressure, to fully adapt to the deformation due to high internal pressure, avoid seal steel plate into elastic-plastic state due to long-term high pressure, and then possibly caused by sealing failure risk.

The invention relates to the technical field of underground gas storage, and discloses a composite sealing structure of an underground gas storage cavern, which comprises a lining covering the wall of the underground gas storage cavern, a drainage system is arranged on one side, close to the wall of the underground gas storage cavern, of the lining, and a buffer layer and an airtight plate sequentially cover the other side of the lining; the drainage system comprises drainage pipes, water inlet holes and flow guide pipes, the drainage pipes are arranged in the lining in the horizontal direction and arranged in the circumferential direction of the underground gas storage cavern at intervals, the water inlet holes are formed in the drainage pipes and used for communicating the interiors of the drainage pipes with the wall of the underground gas storage cavern, and the adjacent drainage pipes are communicated through the flow guide pipes. By arranging the drainage system, water in the rock mass of the underground gas storage cavern enters from the water inlet groove, penetrates through the water inlet hole and enters the drainage pipe, seepage water and gravel mixtures are drained away through the drainage pipe and drained away through the drainage pipe below and the bottom drainage pipe, and the influence of accumulated water on the underground gas storage cavern can be effectively avoided.

The present application relates to the field of underground gas storage engineering test equipment, and specifically discloses an in-situ test system for bearing capacity of surrounding rock of underground gas storage and a test method thereof; an in-situ test hole is drilled and extended to the in-situ test hole of the original rock stress area on the side wall of the existing underground chamber or roadway, a loading assembly filled with high-pressure compressible gas and radially expanded is arranged at the bottom of the hole; a safety counterforce closed assembly including a pressure-bearing component, a force transmission component and an anchoring component is coaxially arranged in the hole, forming an axial counterforce continuous transmission path to limit axial displacement and reduce spouting instability; a stereoscopic monitoring system is formed by arranging monitoring holes and various sensors around the test hole, and stress, deformation, seepage and damage responses are collected; a loading and monitoring closed-loop control system dynamically adjusts the loading pressure, rate, pressure maintaining and cycle parameters according to the monitoring data, completes the graded / cyclic loading, and outputs the ultimate bearing capacity, fatigue bearing capacity index and operation pressure suggestion interval.

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.

The application discloses a kind of underground gas storage cavern depth calculation method based on expansion and crack failure in the technical field of high-pressure gas storage cavern, comprising the following steps: assuming that the failure mode of the overburden of gas storage cavern under the action of internal gas pressure is expansion and crack failure, cracks along one side of the gas storage cavern, the overburden rotates and lifts around the origin of the other side, calculates the lifting torque and anti-lifting torque with the origin, and establishes the torque balance equation, constructs the correlation calculation formula of the gas pressure in the cavern and the minimum burial depth and distance coefficient, and calculates the numerical value of the minimum burial depth of the cavern using the trial method, and the calculation accuracy meets the engineering requirements. Under the premise of ensuring the safety of the gas storage cavern, the minimum burial depth of the cavern can be accurately calculated, thereby saving investment and shortening the construction period, and the engineering benefit is remarkable.

The utility model relates to the field of civil engineering constant high pressure underground artificial gas storage caverns, and discloses an artificial tunnel type structure of a constant high pressure underground gas storage cavern based on a rubber diaphragm, which comprises a pressing strip I and a pressing strip II, steel pipe piece assemblies are arranged on the tops of the two first pressing strips, and rubber diaphragm assemblies are arranged on the inner sides of the second pressing strips. The rubber diaphragm assembly comprises a rubber diaphragm, the rubber diaphragm is installed on the inner side of the second pressing strip, and a plurality of carbon fiber layers are fixedly connected to the inner side of the rubber diaphragm. According to the rubber diaphragm, the strength and the tear resistance of the diaphragm are enhanced through the carbon fiber layer and the nylon wires in the rubber diaphragm, so that the diaphragm can better bear the pressure change of high-pressure air and water and frequent expansion deformation. Therefore, not only is the service life of the diaphragm prolonged, but also the reliability of the diaphragm under severe working conditions is ensured, and the effective realization of the isolation function is ensured.

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.

The invention provides an underground gas storage and relates to the technical field of underground gas storage. The underground gas storage comprises a gas storage chamber arranged underground and used for an energy storage system, and further comprises an inflation and deflation pipeline capable of inflating and deflating the gas storage chamber. A maintenance pipe section detachably connected with the inflation and deflation pipeline is arranged on the inflation and deflation pipeline close to the gas storage chamber, and after the maintenance pipe section is detached from the inflation and deflation pipeline, a channel for people to enter and exit the gas storage chamber is formed in the inflation and deflation pipeline. The underground gas storage chamber solves the problems that when an existing underground gas storage chamber needs to be overhauled, a maintainer carries a tool to go in and out of the gas storage chamber difficultly, and safety is poor, and the underground gas storage chamber is suitable for an underground gas storage of a compressed air energy storage system needing regular maintenance.

The compressed gas energy storage system comprises an underground gas reservoir, gas in the underground gas reservoir can be discharged through a heat removal pipe, and gas can be introduced into the underground gas reservoir through a heat storage pipe; the generator set comprises an expansion machine and a generator, the expansion machine is connected with the generator and can drive the generator to generate electricity, and an inlet of the expansion machine communicates with an outlet of the heat removal pipe; the energy storage unit comprises a motor and a compressor, the motor can utilize to-be-stored electric energy to drive the compressor to compress gas, an inlet of the compressor communicates with an outlet of the expansion machine through a first pipeline, and the first pipeline is provided with a gas supplementing pipeline and a heating device; the gas supplementing pipeline can introduce gas into the first pipeline, and the heating device is used for heating the gas in the first pipeline. Therefore, according to the compressed gas energy storage system, energy waste can be reduced, and the environment can be protected.

The invention discloses a natural gas and compressed air collaborative energy storage system and method for multi-type underground spaces. According to the system, first underground gas storage spaces and second underground gas storage spaces are distributed at intervals; the outlet end of the compressor is connected with the upper end of the first compressed air injection well through a heat exchanger cold side channel. The first air pump is connected with the upper end of the first compressed air recovery well and connected with the inlet end of the expansion machine through a heat exchanger hot side channel. The outlet end of the natural gas compressor connected with the overground gas storage is connected with the natural gas injection well I through an electric control valve; a gas inlet of the overground gas storage is connected with the upper end of the first natural gas recovery well through a second gas pump. The turbine generator is connected with the overground gas storage through a third gas pump and meanwhile connected with the heat exchanger. The method comprises the following steps: in an energy excess period, adopting a strategy of preferentially compressing air energy storage or preferentially compressing natural gas energy storage or alternately storing the compressed air energy storage and the natural gas energy storage at intervals, and in an energy shortage period, adopting a strategy of preferentially generating power or preferentially supplying gas or generating power and simultaneously utilizing natural gas for afterburning and improving efficiency. According to the invention, efficient utilization of energy can be realized.

The invention discloses a trona ore type gas storage building method and system, and relates to the technical field of gas storage building, and the method comprises the steps that trona ore geological data and mechanical property parameters are obtained, and an alkali ore single-cavity geomechanical model is obtained through geomechanical modeling processing; performing crustal stress field simulation treatment to obtain crustal stress field distribution data in a cavity injection-production operation stage; performing dynamic distribution rule research processing to obtain the change rule of the principal stress and the porosity in each direction of the cavity; and determining the shape and the size of the outer boundary of the single cavity and the well spacing between the cavities according to the change rule of the principal stress and the porosity and the research of the change rule of the permeability, so as to finish the construction of the trona mine type gas storage. According to the method, the reasonable well spacing for safe and stable operation of each single cavity in the alkali mine reservoir building area is achieved, reasonable resource utilization is maximized, the overall reservoir capacity and the effective working gas amount of the reservoir building area are ensured, and the method is suitable for developing the natural alkali mine of the sandstone interlayer reconstructed underground gas storage and wide in application prospect.

The invention belongs to the technical field of petroleum and natural gas underground gas storage engineering, and relates to a gas storage stability evaluation method based on a crack crossing prediction model, which comprises the following steps: characterizing the built-in crack form and spatial distribution characteristics of a gas storage-cover layer system, and determining the relative position relationship between cracks and boundaries; the method comprises the following steps: acquiring related rock mechanical parameters of a gas storage-cover layer system through indoor experiments and well logging, and determining the distribution type of mean values of different rock mechanical parameters through Bootstrap resampling; performing Monte Carlo simulation according to the distribution type of the rock mechanical parameter mean value to determine the distribution range of typical values of different rock mechanical parameters; according to a Charles law and a Griffith model, establishing a crack crossing prediction model; the rock mechanical parameters are substituted into the crack crossing prediction model, the long-term expansion trend of cracks in the gas storage is calculated, and evaluation indexes of the long-term stability of the gas storage are established to conduct grading evaluation on calculation results.

The invention relates to a method for constructing a rock salt nonlinear damage creep constitutive model considering a temperature effect. The method comprises the following steps: constructing an element combination model formed by connecting an elastomer, a nonlinear viscous body and a generalized Kelvin body in series as a basic framework of the rock salt nonlinear damage creep constitutive model considering the temperature effect; introducing a damage variable related to time and temperature; establishing a constitutive equation of the nonlinear viscous body of the salt rock; based on the constitutive equation of the salt rock nonlinear viscous body, deducing a total creep strain expression of a salt rock nonlinear damage creep constitutive model considering the temperature effect in a one-dimensional stress state; and carrying out uniaxial compression creep tests on the salt rock sample at different temperatures by adopting a graded loading mode to obtain strain-time data and a corresponding creep curve of the salt rock sample at the corresponding temperature, and carrying out inversion to determine model parameters in the total creep strain expression. The invention also provides a long-term deformation prediction method of the salt-cavern underground gas storage cavern structure.

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 invention relates to the technical field of underground gas storage caverns, in particular to a crack repairing device and system for a gas storage cavern lining and a gas storage cavern. The crack repairing device comprises a grouting main pipe and a plurality of grouting ring pipes which are communicated, the grouting main pipe is arranged in the axial direction of the cavern, and the grouting ring pipes extend in the annular direction of the cavern and are buried in the lining; the grouting ring pipes are arranged at intervals in the axial direction of the cavern, a plurality of grouting holes are formed in the grouting ring pipes, and grout can enter the grouting ring pipes from the grouting main pipes and flow out along the grouting holes. When the cavern is subjected to internal pressure and the lining cracks, grout injected into the grouting main pipe can enter the grouting ring pipe and permeate into the cracks of the lining from the grouting holes in the grouting ring pipe, and the lining cracks are repaired. By the adoption of the crack repairing device, the lining of the gas storage cavern can be reinforced in time, then a sealing layer is protected, the leakage rate is reduced, the frequency of pausing cavern operation overhaul is reduced, the normal operation efficiency of the cavern can be guaranteed, and the operation and overhaul cost of the cavern is reduced.

The application discloses an artificial hard rock underground gas storage for compressed air energy storage. It comprises a ground tunnel entrance in the hard rock distribution range line area, the tunnel entrance is drilled with a tunnel towards the hard rock underground; a plurality of structural and functional independent gas storage units are drilled on both sides of the tunnel path; a sealing plug is arranged at the connection of each gas storage unit and the tunnel, a compressed air pipeline, a drainage pipeline and an artificial channel are penetrated in each sealing plug from the outer end of the tunnel to the inner end of the gas storage unit, and a sealing door is arranged at the connection of each artificial channel and the corresponding gas storage unit. The application utilizes the independence of the gas storage units, flexibly allocates and uses one or more gas storage units according to the charging and discharging requirements, so that the compressed air energy storage power station has the construction conditions in the areas where the underground rock distribution is irregular or uneven, and the application range of the artificial underground gas storage is greatly expanded.

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.

This invention discloses a drying agent, its preparation method, and its application method for converting water-bearing gas reservoirs into gas storage facilities. This invention belongs to the field of underground gas storage facility construction technology. The drying agent is prepared by mixing a desorbent, sodium dodecylbenzenesulfonate, a capillary force neutralizer, and supercritical carbon dioxide. The desorbent causes the aqueous phase to detach from the reservoir pore throats; sodium dodecylbenzenesulfonate acts as an interface modifier, weakening the binding force of the rock on the water film, causing the water film to rupture and converge into water droplets; the capillary force neutralizer is miscible with water, reducing the interfacial tension of the fluid within the pores and converting the bound water trapped in the micropores into flowing water; supercritical carbon dioxide, with its low viscosity and high diffusivity, can flow in the complex and fine pore throat system of the reservoir, and can also carry components such as the desorbent, sodium dodecylbenzenesulfonate, and capillary force neutralizer to the depths of the reservoir's micropores, allowing the components of the drying agent to function in a wider range of reservoir areas.

The invention belongs to the technical field of underground gas storage water invasion amount calculation, and discloses a gas cap reservoir type gas storage multi-cycle dynamic water invasion amount calculation method and a gas cap reservoir type gas storage multi-cycle dynamic water invasion amount calculation system. The method comprises the following steps: establishing a total substance amount conservation equation based on a multi-cycle fluid injection and production change rule of the gas cap reservoir type gas storage; deriving to obtain calculation equations of the amount of original formation fluid substances, the amount of extracted formation fluid substances, the amount of injected natural gas substances and the amount of residual formation fluid substances, and substituting the derived calculation equations into the total substance amount conservation equation to establish a dynamic water invasion amount calculation model; and the formation fluid high-pressure physical property, the reverse condensation liquid saturation degree and the natural gas deviation factor change rule in the multi-period injection and production process are obtained, and the multi-period dynamic water invasion amount is obtained through calculation. The calculation result is high in accuracy, the calculation process is simple, and the method can be suitable for the condensate gas cap reservoir type gas storage where a general material balance method is not suitable.

The present application relates to a kind of underground gas storage, including gas storage body, first drain pipe and multiple second drain pipes, the gas storage body includes supporting layer and the sealing layer being arranged in the supporting layer, the multiple second drain pipes and at least part of the first drain pipe are arranged between the supporting layer and the sealing layer, the second drain pipe is annularly arranged and is sleeved on the gas storage body, the multiple second drain pipes are spaced apart in the length direction of the gas storage body, the first drain pipe is located at the bottom of the gas storage body, each second drain pipe is communicated with the first drain pipe, water inlet is formed on the second drain pipe, and the end of the first drain pipe away from the gas storage body forms drain port.The underground gas storage provided in the present application solves the problem that the operation process of the existing gas storage cavern drainage system is complicated and the operation cost is high.

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.