197 results about "Underground gas storage" patented technology

The invention discloses a compressed air energy storage indoor simulation test device and method, and relates to the technical field of compressed air energy storage. The device comprises a triaxial pressure servo control system, a temperature control system, an air pressure control system and a multi-parameter measurement system, and can cooperatively simulate the real working environment of the underground gas storage. The triaxial system comprises a high-pressure tank body and a loading device and is used for applying triaxial stress to the rock sample; the temperature control system adjusts the temperature of the rock sample; the air pressure system comprises a high-pressure destructive experiment mode and a low-pressure precise simulation mode, the high-pressure destructive experiment mode is used for carrying out a high-pressure test and verifying the critical burial depth under different geological conditions, and the low-pressure precise simulation mode is used for researching the mechanical behavior, the damage mechanism and the leakage mechanism of the gas storage by regulating and controlling the air pressure and the flow and simulating the inflation and deflation process; the multi-parameter measurement system collects rock sample physical response data in real time. Through cooperative work of multiple systems, response characteristics of multiple support sealing systems under different conditions can be accurately reflected, and the system has remarkable simulation precision, experiment efficiency and cost advantages.

The invention discloses an underground gas storage gas monitoring method and system based on optical fiber spectrum analysis. The method comprises the following steps: S1, optical fiber network deployment: arranging a corrosion-resistant optical fiber sensor network in a gas storage; s2, spectral data acquisition: transmitting light with a specific wavelength to a gas chamber at the tail end of an optical fiber through a Fourier transform infrared spectrometer, and acquiring a transmitted spectrum after interaction of gas and light; s3, spectrum decoupling and concentration calculation: based on a peak pattern fitting algorithm of the Lambert-Beer law, decoupling the infrared spectrum characteristics of the mixed gas, matching a standard spectrum database, and calculating the concentration of each gas component; s4, constructing a three-dimensional gas model: according to the position of the optical fiber sensor and the gas concentration data, establishing a gas migration model to predict a leakage position and a movement direction; according to the method, the trend, the component distribution, the concentration change and the potential leakage risk of the gas in the storage are effectively evaluated, and technical support is provided for the safety, the effectiveness and the economical efficiency of operation of the gas storage.

Disclosed is a physical simulation experiment system for vapor-liquid multiphase seepage in an underground gas storage facility in a depleted gas reservoir, including: a rock sample sealing, heating, and insulation system, a triaxial stress and confining pressure loading system, an oil-gas-water injection and pore pressure supply system, a vapor-liquid-solid three-phase separation and measurement system, an optical micro / nanofiber gas detection and monitoring system, a distributed fiber optic sensing system, and a gas supply and leakage alarm system, where the rock sample sealing, heating, and insulation system is used for accommodating and heating a rock sample; and the oil-gas-water injection and pore pressure supply system performs oil-gas-water injection into the rock sample and pore pressure maintenance. The present application aims to overcome the bottleneck problem of evaluating the dynamic sealing integrity of underground gas storage under alternating loads caused by injection and withdrawal.

The invention provides high-toughness micro-expansive cement paste suitable for high-temperature well cementation. The cement paste comprises the following raw materials in parts by weight: 60-90 parts of G-grade oil well cement, 20-40 parts of an active material, 3-12 parts of a high-performance toughening agent, 3-10 parts of nano oxide, 0.5-5 parts of an expanding agent, 3-5 parts of a chemical exciting agent, 1-3 parts of a high-temperature fluid loss agent, 0.5-3 parts of a high-temperature retarder and 0.1-1 part of a dispersing agent, and 0.2-1 part by weight of a defoaming agent. By adding the active material, the high-performance toughening agent, the nano oxide and the expanding agent, the high-temperature resistance and toughness of the cement paste, the cementation quality of a cement sheath and the like are improved; through the combined action of the four components, the high-temperature resistance, toughness and surrounding rock interface cementation performance of the cement are comprehensively improved; and the cement paste is matched with other components for use, so that the cement paste has the advantages of good stability, low water loss, good rheological property and the like, is suitable for underground gas storage well cementation, can improve the well cementation quality of a stratum sealing section, and ensures the sealing integrity of a cement sheath under frequent injection and production.

The invention discloses an optimal reservoir building horizon site selection method for a multi-layer water-bearing gas reservoir underground gas storage. The method comprises the following steps: performing reservoir feature evaluation on each layer in a target gas reservoir; analyzing a reservoir cover system by utilizing the relationship between the lithologic configuration relationship of two sides of the fault and the fault mud ratio, and evaluating the change of a three-dimensional stress field under the injection-production pressure disturbance; from the perspective of production dynamics, historical data of a target gas reservoir are researched for productivity analysis, the water invasion amount and the gas-water ratio are calculated layer by layer, fine description and quantitative characterization are performed on the water invasion dynamics, and the gas-water distribution and migration conditions are determined; and finally, carrying out comprehensive evaluation, and selecting an optimal library building horizon. From two aspects of reservoir geologic characteristics and production dynamics, quantitative analysis and evaluation are carried out on all layers and small layers of the target gas reservoir, then the optimal target layer position can be relatively accurately selected, the reservoir building operation effect is good, the oil ring damage degree is small, and bottom water invasion can be effectively blocked.

The invention provides a gas reservoir gas storage injection-production optimization method based on block pressure balance control. The method comprises the following steps: acquiring target gas reservoir basic data; establishing a gas reservoir gas storage production operation dynamic optimization model objective function; constructing a gas reservoir gas storage production operation dynamic optimization model constraint condition; and solving the gas reservoir gas storage production operation dynamic optimization model, and generating a gas reservoir gas storage optimization injection-production scheme. On the basis of the injection-production scheduling optimization problem of the multi-block gas reservoir type underground gas storage, the corresponding optimization model is established with the purpose of minimizing the pressure difference degree between the gas reservoir blocks in the injection-production process, and the injection-production scheduling scheme is successfully solved through the established optimization model and the solving method. According to the method, the deviation degree of the formation pressure between the blocks can be effectively reduced under the condition that the requirement for the gas injection and production amount of the gas storage is met, extreme high-pressure blocks can be effectively avoided, and safe and stable operation of the gas storage is further guaranteed.

The utility model discloses a gas storage tunnel transformed based on a waste chamber of a hydropower station, which belongs to the technical field of underground energy storage and comprises a backfill concrete layer, a reinforced concrete lining and a flexible concrete sealing layer which are sequentially poured on a surrounding rock of a chamber wall, and the cross section of the inner wall of the backfill concrete layer is circular. A plurality of water drainage floral tubes are arranged on the inner wall of the chamber at intervals in the circumferential direction of the chamber, the length direction of the water drainage floral tubes is consistent with the length direction of the chamber, the water drainage floral tubes penetrate through the two ends of the whole chamber, and a plurality of through holes are evenly distributed in the wall of each water drainage floral tube. During operation, the air tightness of the gas storage tunnel can be fed back through the exhaust condition in the drainage floral tube, meanwhile, external pressure water can be collected and discharged through the drainage floral tube, and damage to a lining of the gas storage tunnel is avoided; the flexible concrete sealing layer not only can adapt to deformation of the inner wall of the chamber caused by internal air pressure, but also can play a sealing role, so that the abandoned chamber of the hydropower station can be used as an underground gas storage of a compressed air energy storage power station.

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 invention provides a compressed air energy storage underground air storage device and a construction method thereof, and relates to the technical field of underground air storage, the compressed air energy storage underground air storage device comprises two air storage layers, the two air storage layers are buried underground in a U shape, the two air storage layers are in butt joint to form a square, a transverse channel is arranged between the two butt joint ends of the two air storage layers, and the transverse channel is communicated with the air storage layers. Compared with the prior art, the U-shaped gas storage layer is separated by the overhaul layer, the first gas inlet pipe and the first gas outlet pipe in each section are communicated with the second gas inlet pipe and the second gas outlet pipe, and under the action of the driving assembly, the gas storage layer is driven by the driving assembly to rotate, so that the gas storage layer can be maintained, and the service life of the gas storage layer is prolonged. The gas charging stage and the gas discharging stage can be independently carried out in each section of gas storage layer, pressure values in other gas chambers cannot be affected, alternate opening and closing can be carried out, gas is charged or discharged according to needs, and the stability of the gas storage layer is kept.

The invention relates to the technical field of compressed air energy storage, and discloses a compressed air energy storage underground gas storage sealing layer steel plate joint structure and a design method. The compressed air energy storage underground gas storage sealing layer steel plate connector structure comprises an arc-shaped connector and deformation filler. The deformation filler is located between the arc-shaped connector and a slippage layer of the underground gas storage. The joint structure is a reciprocating telescopic joint structure, is arranged in the annular direction of a sealing layer steel plate of the underground gas storage and is used for coordinating annular tensile deformation of the sealing layer steel plate when the underground gas storage is inflated and longitudinal compression deformation of the sealing layer steel plate under the action of high pressure and high temperature. The joint structure adopts an adjustable telescopic design, and can effectively adapt to deformation caused by high-pressure gas, periodic temperature change and geological condition difference during operation of the gas storage, so that stress accumulation in the steel plate is released, permanent deformation of a material is prevented, and the long-term stability of a sealing interface is guaranteed.

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 discloses an underground gas storage pile foundation energy comprehensive utilization system which comprises a compressed air preparation module, an underground gas storage pile energy storage module, a heat recycling module and an expansion power generation module, the compressed air preparation module comprises a compressor unit and a cooler, and the compressed air preparation module is used for preparing and cooling compressed air; the underground air storage pile energy storage module comprises one or more underground air storage piles, and the underground air storage piles are used for storing normal-temperature high-pressure compressed air; the expansion power generation module comprises a turbine expansion unit and a power generator, and the turbine expansion unit is used for expanding the normal-temperature high-pressure compressed air so as to drive the power generator to generate power; the heat recycling module is used for recycling heat and cold generated in the air compression process or expansion process, a pressure-resistant sealed space is constructed in a pile body to store compressed air, and the heat recycling module and a rock-soil body auxiliary heat exchange loop are arranged, so that heat-electricity-cold combined supply and multi-energy collaborative management of a building are achieved.

The invention provides a system of a pumped storage coupled compressed air energy storage underground gas storage with an air cushion type surge shaft and an operation method. The system comprises a compressed air energy storage system and a pumped storage system. The interior of the water-gas co-containing bin is divided into an upper-layer gas storage chamber and a lower-layer water storage chamber through a flexible material. The air inlet end of the compression system is communicated with the second air path; the air outlet end of the compression system is connected to the air inlet of the upper-layer air storage chamber through a first air path; a first air valve is mounted on the first air path; a gas outlet of the upper-layer gas storage chamber is connected to the expansion unit through a third gas path, and a second gas valve is mounted on the third gas path; and a detection sensor is mounted in the water-gas co-containing bin. The stability and economical efficiency of the compressed air energy storage are improved, the compressed air utilization rate is increased, the combined operation mode of compressed air energy storage and pumped storage is simplified, the combined dispatching mode of novel energy storage is optimized, and then the safety and reliability of pumped storage are improved.

The invention relates to the technical field of underground gas storages, and discloses an underground gas storage and an underground gas storage.The underground gas storage comprises surrounding rock, a supporting layer, linings and flexible filling parts, the surrounding rock is arranged underground, an opening is formed in the top of the surrounding rock, a containing cavity is formed in the surrounding rock, the supporting layer is arranged on the inner wall of the containing cavity, and the linings are arranged on the inner side of the supporting layer; a seam is formed between every two adjacent linings, a gas storage cavity is defined by the linings, the flexible filling pieces are arranged in the seams, and the sides, away from the surrounding rock, of the flexible filling pieces protrude out of the seams, the seams between the adjacent linings are filled with the flexible filling pieces, when the pressure in the gas outlet cavities is high, the linings are extruded by gas pressure to displace, the seams between the linings are enlarged, and the gas storage cavity is formed. The flexible filling piece deforms under the action of air pressure, and the end, protruding out of the parting joint, of the flexible filling piece is extruded and deformed towards the interior of the parting joint, so that the sealing performance of the parting joint can be guaranteed, the sealing performance of the underground gas storage is guaranteed, and meanwhile the lining can be prevented from cracking under the action of pressure.

The invention belongs to the technical field of underground gas storage, and particularly relates to an energy-storage and hydrogen-storage modified asphalt slip layer for an underground rock cave and a preparation method of the energy-storage and hydrogen-storage modified asphalt slip layer. The modified asphalt slip layer disclosed by the invention has a lubricating effect, and can promote interlayer slip between structures and reduce the friction resistance of the contact surface of the concrete lining and the steel lining, so that the tensile stress of the steel lining is reduced, and the fatigue damage of the steel lining of a sealing layer caused by frequent inflation and deflation is relieved. Wherein through the modification of the styrene-butadiene-styrene block copolymer, the slippage layer has higher durability; the long-fiber polyester felt base cloth and the talcum powder are used, so that the thickness of the slip layer is increased and can reach 5-6 mm; and the viscosity of the slip layer is increased by using the hot melt adhesive, so that the slip layer can be quickly adhered to a structure to realize quick construction. An effective solution is provided for reducing fatigue damage and deterioration of the sealing layer steel lining and guaranteeing the sealing performance of the underground rock tunnel energy storage and hydrogen storage facility, and the method is suitable for large-scale application and popularization.

The invention provides an intelligent HSE management method for an underground gas storage. According to the method, the operation condition of the gas storage is monitored in real time through a multi-source data acquisition network, and risk assessment and personalized HSE guidance generation are performed by using an improved Transform model. The system adopts a multi-agent hierarchical reinforcement learning framework to carry out emergency decision support, and introduces a multi-source heterogeneous federated learning framework to realize continuous optimization. According to the method, advanced technologies such as deep learning, knowledge graph and causal reasoning are integrated, and knowledge sharing among multiple gas storages is realized while data privacy is protected. According to the system, the safe operation level of the gas storage is remarkably improved, the accident rate is reduced, and an innovative solution is provided for the progress of industry safety management practice.

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 discloses a gas storage salt cavern volume measuring device and method based on acoustic reverberation, and relates to the field of acoustic reverberation method measurement, the gas storage salt cavern volume measuring device comprises a sonar measuring cabin, a transmitting cabin and at least one receiving cabin, the transmitting cabin is used for transmitting measurement sound waves, and the receiving cabin is used for collecting reverberation field sound pressure; calculating a space average sound pressure level and reverberation time; the shaft sleeve extends downwards from the wellhead to the top of the salt cavern; the pulley system is used for stably putting the sonar measurement cabin into the salt cavern; the measuring vehicle is used for pulling the armored cable, the other end of the armored cable penetrates through the shaft casing pipe after the direction of the armored cable is adjusted through the pulley system and is connected with the sonar measuring cabin, and the measuring vehicle supplies power to the sonar measuring cabin through the armored cable and receives measuring data of the sonar measuring cabin for analysis and storage. The invention provides the underground gas storage salt cavern volume measurement method and device based on the pool acoustic reverberation theory. The method and device have the advantages of being rapid and accurate in measurement and low in cost.

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 invention relates to the field of underground engineering, and more specifically, to a compressed gas energy storage underground cavern support structure and its design method. The present invention provides a compressed gas energy storage underground cavern support structure and its design method, which are suitable for the design of compressed gas energy storage underground gas storage chamber structures. By simplifying the structure, decomposing the functions of each layer, and specifically selecting materials and designing the structures of each layer, the support structure coordinates the deformation of each layer, fully utilizing the bearing capacity of the surrounding rock, and ensuring the sealing of the cavern. Compared with existing structures, this structure does not have a secondary lining or a thicker steel lining, which greatly improves the economic efficiency.

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 invention discloses an underground gas storage drainage system and a drainage method thereof. The drainage system comprises a plurality of gas storage caverns arranged side by side, and a traffic tunnel is arranged between every two adjacent gas storage caverns; a first drainage pipe, a plurality of second drainage pipes and a plurality of third drainage pipes are arranged outside the gas storage cavern; the first drainage pipe is arranged at the bottom of the gas storage cavern; the second drainage pipes are arranged on the side wall of the gas storage cavern, and the multiple second drainage pipes are arranged at intervals in the length direction of the gas storage cavern; a plurality of third drainage pipes are arranged on each second drainage pipe at intervals in the length direction, and at least one water inlet hole is formed in the side wall of each third drainage pipe; one end of the third drainage pipe is communicated with the second drainage pipe, and the other end extends away from the gas storage cavern; one end of the first drainage pipe is communicated with the second drainage pipes, the other end of the first drainage pipe extends into the traffic hole, and a valve is arranged at the end, extending into the traffic hole, of the first drainage pipe. The drainage system solves the technical problem that in the prior art, the pressure of water outside a gas storage is large.