CN114607938B - Salt cavern hydrogen storage gas production pipe sealing process - Google Patents
Salt cavern hydrogen storage gas production pipe sealing process Download PDFInfo
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- CN114607938B CN114607938B CN202210201386.7A CN202210201386A CN114607938B CN 114607938 B CN114607938 B CN 114607938B CN 202210201386 A CN202210201386 A CN 202210201386A CN 114607938 B CN114607938 B CN 114607938B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/1616—Devices for covering leaks in pipes or hoses, e.g. hose-menders the material forming the pipe or hose being self-sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0142—Applications for fluid transport or storage placed underground
- F17C2270/0144—Type of cavity
- F17C2270/0149—Type of cavity by digging cavities
- F17C2270/0152—Salt caverns
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the technical field of salt cavern hydrogen storage, in particular to a salt cavern hydrogen storage gas production pipe sealing process which is applied to a sealing sleeve and comprises the following steps of: s1, installing n packers in a hydrogen seal sleeve and injecting filling liquid, wherein n is more than or equal to 2; s2, when n=2, firstly installing the 1 st packer during installation; filling liquid is injected, and then a 2 nd packer is installed; s3, when n is more than 2, firstly installing a 1 st packer; filling liquid is then injected, a 2 nd packer is installed above the filling liquid, filling liquid is then injected, and the nth-1 st packer is installed by analogy, filling liquid is then injected, and the nth packer is installed above the filling liquid. According to the sealing process for the hydrogen storage gas production pipe of the salt cavern, when hydrogen stored in the salt cavern permeates into filling liquid from a packer, trace water in the hydrogen can react with a curing agent and a prepolymer, and solid substances are generated under the action of a plasticizer and a silane coupling agent to seal the sealing sleeve.
Description
Technical Field
The invention relates to the technical field of hydrogen storage, in particular to a sealing process of a salt cavern hydrogen storage gas production pipe.
Background
At present, hydrogen is widely applied, hydrogen is also widely used as a fuel, and the hydrogen can be used as the fuel, so the problems caused by the hydrogen are faced, wherein the storage problem of the hydrogen is difficult, high pressure and high sealing are needed, and once the hydrogen leaks, explosion is easily caused, thus the hydrogen brings threat to people and property.
Because hydrogen is easy to generate hydrogen corrosion phenomena such as hydrogen bulge, hydrogen embrittlement, hydrogen corrosion and the like on metal materials, and sealing materials such as rubber and the like are easy to age after being used for a long time, and hydrogen can slowly permeate into the sealing materials in the hydrogen storage process, and finally the hydrogen leakage is caused, the conventional sealing structure cannot meet the sealing requirement of hydrogen storage in salt caves.
Disclosure of Invention
The invention aims to solve the technical problems that: the invention provides a sealing process of a hydrogen storage and production pipe of a salt cavern, which aims to solve the technical problems that the existing sealing structure cannot meet the sealing requirement of hydrogen storage of the salt cavern and is easy to cause leakage of stored hydrogen.
The technical scheme adopted for solving the technical problems is as follows: the sealing process of the salt pit hydrogen storage gas production pipe is applied to a sealing sleeve, the sealing sleeve is sleeved outside the gas production pipe and used for sealing the gas production pipe, and the sealing process of the salt pit hydrogen storage gas production pipe comprises the following steps of:
s1, installing n packers in a hydrogen seal sleeve, wherein n is more than or equal to 2, sealing the seal sleeve by the packers, and injecting filling liquid between two adjacent seal sleeves to improve sealing performance;
s2, when n=2, firstly installing the 1 st packer during installation; filling liquid is filled above the 1 st packer, and then the 2 nd packer is installed above the filling liquid;
s3, when n is more than 2, firstly installing a 1 st packer; filling liquid is filled above the 1 st packer, then the 2 nd packer is installed above the filling liquid, filling liquid is filled above the 2 nd packer, and so on, the n-1 st packer is installed, filling liquid is filled above the n-1 st packer, and then the n-th packer is installed above the filling liquid.
Further, the value range of the distance L between two adjacent packers is more than or equal to 50 meters and less than or equal to 100 meters. The distance between two adjacent packers is used for supporting filling liquid in the whole sealing sleeve, the plurality of packers support the plurality of sections of filling liquid, so that the pressure of all the filling liquid is prevented from being concentrated on the packer at the lowest part, the pressure of the plurality of sections of filling liquid is prevented from being dispersed, the situation that the pressure received by the packers is overlarge and the sealing sleeve falls off is avoided, the filling liquid fills the whole sealing sleeve mainly for sealing the sealing sleeve in an omnibearing manner to prevent leakage, the sealing sleeve comprises a welding spot and other places on the sealing sleeve, and leakage at any point on the sealing sleeve can play a sealing role in time to realize dynamic sealing.
Further, the filling liquid includes: silane coupling agent, sealing prepolymer, sealing curing agent and plasticizer. The filling liquid comprises a liquid mixture of several substances, namely a silane coupling agent, a sealing prepolymer, a sealing curing agent and a plasticizer, wherein the silane coupling agent is used for increasing the adhesive force between an organic substance and an inorganic substance, accelerating the curing performance of the filling liquid, the plasticizer is mainly used for increasing the fluidity of the filling liquid and improving the toughness of the cured solid, so that the curing sealing performance of the filling liquid is enhanced.
Further, the mass percentages of the silane coupling agent, the sealing prepolymer, the sealing curing agent and the plasticizer are as follows: silane coupling agent: sealing prepolymer: blocking curing agent: plasticizer = 2% -5%: 50% -60%: 30% -40%: 5% -8%. In the filling liquid, the silane coupling agent is used as an additive, so that the dosage is small, the plasticizer is also mainly an additive, and the main components are also a sealing prepolymer and a sealing curing agent.
Further, the silane coupling agent is one or a mixture of two of gamma-aminopropyl triethoxysilane and gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane.
Further, the sealing prepolymer is isocyanate, and the sealing prepolymer comprises one or more of toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate.
Further, the blocking curing agent is ketimine and aldimine.
Further, the plasticizer is one or more of phthalate, di (2-ethylhexyl) phthalate, dibutyl phthalate and diethyl phthalate.
Further, cement is poured on the outer surface of the gas production pipe to fix the gas production pipe with the surface layer.
The sealing sleeve has the beneficial effects that the sealing sleeve is internally provided with the packer and the filling liquid, the sealing performance of the sealing sleeve is enhanced after hydrogen is injected into the salt cavern, in the hydrogen storage process, the hydrogen stored in the salt cavern is in a high-pressure state, and can slowly permeate into the packer under the high-pressure state, when the packer is used for a long time, aging is easy to occur, the hydrogen in the salt cavern is easy to leak from the packer, when the hydrogen permeates into the filling liquid above the packer from the packer, the water in the hydrogen can react with the curing agent and the sealing prepolymer, and solid substances are generated under the actions of the plasticizer and the silane coupling agent to seal the sealing sleeve; since the filler itself is reactive with water, it is necessary to work in a dry condition, and the filler includes a liquid mixture of several substances, such as a silane coupling agent, a sealing prepolymer, a sealing curing agent, and a plasticizer, and the filler itself does not contain moisture. The sealing prepolymer (isocyanate) reacts with water but in the absence of a blocked curing agent it reacts very slowly with water and generates a lot of carbon dioxide, which can occur in the case of drums if there is moisture in the feed. The blocked curing agent is also reactive with water, the blocked curing agent is prepared by condensation reaction of polyamine and ketone, residual amine is blocked by monoepoxy compound, the blocked environment can be opened when meeting water, amine is released, the amine is curing agent of isocyanate, the reaction of amine and isocyanate is very rapid, and the toughness of isocyanate can be improved. The isocyanate reacts with the amine to generate substituted urea and is solidified, compact sealing solid is formed under the action of the plasticizer, the toughness of the solidified solid is improved, the silane coupling agent can enhance the connection between the organic condensate and the inorganic sealing sleeve, and a compact protective film is formed between the sealing sleeve and the solid matter after the filling liquid is solidified to prevent the diffusion of gas.
The plurality of packers and the multi-section filling liquid are used for sealing, and the plurality of packers and the multi-section filling liquid are arranged in a staggered mode, so that multistage sealing is carried out on the sealing sleeve, and the sealing performance of the sealing sleeve is further enhanced.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the structure of the salt cavern hydrogen storage gas production tube seal of the present invention.
FIG. 2 is a schematic flow chart of the sealing process of the salt cavern hydrogen storage gas production pipe.
In the figure: 1. a packer; 2. filling liquid; 3. sealing the sleeve; 4. and a gas production pipe.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A salt cavern hydrogen storage gas production pipe sealing process according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the sealing process of the salt pit hydrogen storage gas production pipe is applied to a sealing sleeve 3, the sealing sleeve 3 is sleeved outside a gas production pipe 4 and is used for sealing the gas production pipe 4, and the sealing process of the salt pit hydrogen storage gas production pipe comprises the following steps:
s1, installing n packers 1, wherein n is more than or equal to 2, in a hydrogen sealing sleeve 3, sealing the sealing sleeve 3 by the packers 1, and filling liquid 2 is injected between two adjacent sealing sleeves 3 to improve sealing performance; the packer 1 and the filling liquid 2 are arranged between the gas production pipe 4 and the sealing sleeve, and the space between the sealing sleeve 3 and the gas production pipe 4 is sealed.
S2, when n=2, firstly installing the 1 st packer 1 when installing; filling liquid 2 is injected above the 1 st packer 1, and then the 2 nd packer 1 is installed above the filling liquid 2;
s3, when n is more than 2, firstly installing a 1 st packer 1; filling liquid 2 is filled above the 1 st packer 1, then the 2 nd packer 1 is installed above the filling liquid 2, the filling liquid 2 is filled above the 2 nd packer 1, and so on, the n-1 st packer 1 is installed, the filling liquid 2 is filled above the n-1 st packer 1, and then the n-th packer 1 is installed above the filling liquid 2.
Further, the value range of the distance L between two adjacent packers 1 is greater than or equal to 50 meters and less than or equal to 100 meters. The distance between two adjacent packers 1 is used for supporting filling liquid 2 in the whole sealing sleeve 3, the plurality of packers 1 support the plurality of sections of filling liquid 2, so that the pressure of all the filling liquid 2 is prevented from being concentrated on the lowermost packer 1, the pressure of the plurality of sections of filling liquid 2 is dispersed, the situation that the pressure born by the packer 1 is overlarge and the sealing sleeve 3 falls off is avoided, the filling liquid 2 fills the whole sealing sleeve 3 and mainly seals the sealing sleeve 3 in an all-around way to prevent leakage, the leakage of the sealing sleeve 3 comprises the leakage prevention of welding spots and other places on the sealing sleeve 3, and the leakage of any point on the sealing sleeve 3 can timely play a sealing role to realize dynamic sealing.
Further, the filling liquid 2 includes: silane coupling agent, sealing prepolymer, sealing curing agent and plasticizer. The filling liquid 2 comprises a liquid mixture of several substances, namely a silane coupling agent, a sealing prepolymer, a sealing curing agent and a plasticizer, wherein the silane coupling agent is used for increasing the adhesive force between an organic substance and an inorganic substance, accelerating the curing performance of the filling liquid 2, and the plasticizer is mainly used for increasing the fluidity of the filling liquid 2 and improving the toughness of the cured solid, so that the curing sealing performance of the filling liquid 2 is enhanced, the substances of the silane coupling agent, the sealing prepolymer, the sealing curing agent and the plasticizer do not react with each other under the premise of no moisture, only the sealing sleeve 3 leaks, hydrogen in a salt cavity enters the filling liquid 2, and the hydrogen stored in the salt cavity contains moisture because brine is used as a base liquid, the hydrogen with the moisture enters the filling liquid 2, the water in the hydrogen reacts with the sealing curing agent and the sealing prepolymer, and the solid substance is generated under the action of the plasticizer and the silane coupling agent to seal the sealing sleeve 3.
Further, the mass percentages of the silane coupling agent, the sealing prepolymer, the sealing curing agent and the plasticizer are as follows: silane coupling agent: sealing prepolymer: blocking curing agent: plasticizer = 2% -5%: 50% -60%: 30% -40%: 5% -8%. In the filling liquid 2, the silane coupling agent is used as an additive, so that the amount of the silane coupling agent is small, the plasticizer is also mainly an additive, and the main components are also a sealing prepolymer and a sealing curing agent.
Further, the silane coupling agent is one or a mixture of two of gamma-aminopropyl triethoxysilane and gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane.
Further, the sealing prepolymer is isocyanate, and the sealing prepolymer comprises one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI) and Hexamethylene Diisocyanate (HDI).
Further, the blocking curing agent is ketimine, aldimine or ketene.
Further, the plasticizer is one or more of phthalate, di (2-ethylhexyl) phthalate, dibutyl phthalate and diethyl phthalate.
Further, cement is poured on the outer surface of the gas production pipe 4 to fix the gas production pipe 4 with the surface layer.
The invention has the beneficial effects that the sealing sleeve 3 is enhanced in sealing performance after hydrogen is injected into the salt cavern by arranging the packer 1 and the filling liquid 2 in the sealing sleeve 3, in the hydrogen storage process, the hydrogen stored in the salt cavern is in a high-pressure state and slowly permeates into the packer 1 in the high-pressure state, when the packer 1 is used for a long time, aging easily occurs, the hydrogen in the salt cavern is easy to leak from the packer 1, when the hydrogen permeates into the filling liquid 2 above the packer 1 from the packer 1, water in the hydrogen can react with the curing agent and the sealing prepolymer, and solid matters are generated under the action of the plasticizer and the silane coupling agent to seal the sealing sleeve 3; since the filler liquid 2 itself reacts with water, it is necessary to construct in a dry state, the filler liquid 2 includes a liquid mixture of several substances, such as a silane coupling agent, a sealing prepolymer, a blocking curing agent and a plasticizer, and the filler liquid 2 itself does not contain moisture. The sealing prepolymer (isocyanate) reacts with water but in the absence of curing agent it reacts very slowly with water and generates a lot of carbon dioxide, if there is moisture in the raw material, a drum situation occurs, so that it is necessary to keep the filling liquid 2 free from moisture. The blocked curing agent is also reactive with water, the blocked curing agent is prepared by condensation reaction of polyamine and ketone, residual amine is blocked by monoepoxy compound, the blocked environment can be opened when meeting water, amine is released, the amine is curing agent of isocyanate, the reaction of amine and isocyanate is very rapid, and the toughness of isocyanate can be improved. The isocyanate reacts with the amine to generate substituted urea and is solidified, compact sealing solid is formed under the action of the plasticizer, the silane coupling agent can enhance the connection between the organic solidified material and the inorganic sealing sleeve 3, and a compact protective film is formed between the sealing sleeve 3 and the solid material after the solidification of the filling liquid 2 to prevent the diffusion of gas.
The plurality of packers 1 and the plurality of sections of filling liquid 2 are used for sealing, and the plurality of packers 1 and the plurality of sections of filling liquid 2 are arranged in a staggered mode, so that the sealing sleeve 3 is subjected to multistage sealing, and the tightness of the sealing sleeve 3 is further enhanced.
A method of reducing the consumption of hydrogen gas by microorganisms in an underground salt cavern according to the present invention will be described in detail with reference to the following examples.
Example 1
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 2%:50%:40%:8, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time required for curing the filling liquid was recorded to be 1.5 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 2.5MP.
Example 2
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 2%:60 percent: 30%:8, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time required for curing the filling liquid was recorded to be 2 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 2.5MP.
Example 3
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 2%:55% >: 35%:8, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time required for curing the filling liquid was recorded to be 1.8 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 2.5MP.
Example 4
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 5%:50%:40%:5, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time for curing the filling liquid was recorded to be 1.5 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 3MP.
Example 5
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 4%:50%:40%:6, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time required for curing the filling liquid was recorded to be 1.5 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 2.8MP.
Comparative example 1
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 2%:90% >: 0%:8, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time required for curing the filling liquid was recorded to be 10 hours, and the shear strength at the bonding part of the cured material and the container was recorded to be 2.5MP.
Comparative example 2
Firstly, weighing the following raw materials in percentage by mass in a dry environment: gamma-aminopropyl triethoxysilane: toluene diisocyanate: bis-N, N' - (methyl-butylmethylene) -diethylenetriamine: phthalate = 0%:50%:40%:10, placing the weighed raw materials into a dry sealed container for stirring and mixing, preparing filling liquid, and stirring and mixing under a dry environment;
then, nitrogen with water is introduced into the dry and sealed container under the normal temperature environment, and because hydrogen is unstable and is extremely easy to explode, nitrogen is used for replacing hydrogen for experiments in the process of experiments, the state of filling liquid is observed after the nitrogen with water is introduced, the time required for the filling liquid to change from liquid state to solid state is recorded, and after the filling liquid is solidified, shear strength test is carried out on the bonding part of the solidified substance and the container.
After the experiment, the time for curing the filling liquid was recorded to be 1.5 hours, and the shear strength of the bonding part of the cured material and the container was recorded to be 0.3MP.
Analyzing the data obtained by the experiment, and arranging a data list as shown in the following table one:
list one
As can be seen from table one, the time taken for the filling liquid to cure is affected by the content of the blocked curing agent, and the curing speed of the filling liquid is very slow when the blocked curing agent is not acting, the curing speed of the filling liquid is obviously accelerated by adding the curing agent into the filling liquid, and the curing time is shorter as compared with the comparative example 1, the example 2 and the example 3. In addition, the higher the content of the blocking curing agent, the faster the curing speed of the filling liquid, and the shorter the time taken for the filling liquid to cure. This is because the sealing prepolymer (isocyanate) reacts with water, but in the absence of a curing agent, the reaction with water is very slow and generates a large amount of carbon dioxide, while the blocked curing agent is also reactive with water, the blocked curing agent itself is prepared by condensation of a polyamine with a ketone, the remaining amine must be blocked with a monoepoxy compound, the blocked environment is opened when exposed to water, the amine is released, the reaction of the amine with isocyanate is very rapid, and the toughness of the isocyanate can be improved. The isocyanate reacts with the amine to form a substituted urea and cures, forming a dense seal solid under the action of the plasticizer.
As is clear from the comparison of comparative examples 2, 1, 4 and 5, the shear strength of the bonding site between the cured material and the container is affected by the silane coupling agent, and when the silane coupling agent is not used, the shear strength of the bonding site between the cured material and the container is poor, the bonding property between the cured material and the container is poor, the cured material and the container are easily separated after being subjected to pressure, the sealing property between the cured material and the container is poor, and the higher the content of the silane coupling agent is, the stronger the shear strength of the bonding site between the cured material and the container is, because the silane coupling agent can enhance the connection between the organic cured material and the inorganic material (i.e. the container), so that the shear strength of the bonding site between the cured material and the container can be enhanced by adding a proper amount of the silane coupling agent in the process of preparing the filling liquid, but the main components of the filling liquid should be a sealing prepolymer and a sealing curing agent, and the percentage of the silane coupling agent is not suitable to be too high.
According to the filling liquid disclosed by the invention, when hydrogen is leaked into the filling liquid, as the hydrogen stored in the salt cavern contains a certain content of water, the water in the hydrogen reacts with the filling liquid, so that the filling liquid is solidified, a compact sealing solid is formed under the action of the plasticizer, a substance solidified by the filling liquid is bonded with the sealing sleeve under the action of the silane coupling agent in the filling liquid, a compact protective film is formed between the sealing sleeve and the solid substance solidified by the filling liquid to prevent gas diffusion, the hydrogen leakage can be effectively prevented, and the silane coupling agent can improve the shearing strength of the joint of the substance solidified by the filling liquid and the sealing sleeve, so that the substance solidified by the filling liquid can bear larger pressure and is not easy to separate from the sealing sleeve, and therefore, the pressure applied by a packer above the filling liquid can be borne, and the sealing sleeve above the sealing liquid can be well supported, and the multistage sealing effect of a plurality of packers and multistage filling liquids is better.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined as the scope of the claims.
Claims (7)
1. The utility model provides a salt cave hydrogen storage gas production pipe sealing process, is applied to among sealing sleeve (3), and sealing sleeve (3) suit is used for sealing gas production pipe (4) outside gas production pipe (4), its characterized in that: the sealing process of the salt cavern hydrogen storage gas production pipe comprises the following steps:
s1, installing n packers (1) in a hydrogen seal sleeve (3), wherein n is more than or equal to 2, the packers (1) seal the seal sleeves (3), and filling liquid (2) is injected between two adjacent seal sleeves (3) to improve the sealing performance;
s2, when n=2, firstly installing the 1 st packer (1) during installation; filling liquid (2) is injected above the 1 st packer (1), and then the 2 nd packer (1) is installed above the filling liquid (2);
s3, when n is more than 2, firstly installing a 1 st packer (1); filling liquid (2) is filled above the 1 st packer (1), then the 2 nd packer (1) is installed above the filling liquid (2), the filling liquid (2) is filled above the 2 nd packer (1), and so on, the n-1 st packer (1) is installed, the filling liquid (2) is filled above the n-1 st packer (1), and then the n-th packer (1) is installed above the filling liquid (2);
the filling liquid (2) comprises: a silane coupling agent, a sealing prepolymer, a sealing curing agent and a plasticizer;
the mass percentages of the silane coupling agent, the sealing prepolymer, the sealing curing agent and the plasticizer are as follows: silane coupling agent: sealing prepolymer: blocking curing agent: plasticizer = 2% -5%: 50% -60%: 30% -40%: 5% -8%.
2. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: the value range of the distance L between two adjacent packers (1) is more than or equal to 50 meters and less than or equal to 100 meters.
3. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: the silane coupling agent is one or two of gamma-aminopropyl triethoxysilane and gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane.
4. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: the sealing prepolymer is isocyanate, and is one or more of toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate.
5. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: the sealing curing agent is ketimine, aldimine or ketene.
6. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: the plasticizer is one or more of phthalate, di (2-ethylhexyl) phthalate, dibutyl phthalate and diethyl phthalate.
7. The salt cavern hydrogen storage gas production pipe sealing process according to claim 1, wherein: cement is poured on the outer surface of the gas production pipe (4) to fix the gas production pipe (4) with the surface layer.
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