CN112251265A - Method for forming hydrate by clay medium - Google Patents
Method for forming hydrate by clay medium Download PDFInfo
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- CN112251265A CN112251265A CN202011135220.7A CN202011135220A CN112251265A CN 112251265 A CN112251265 A CN 112251265A CN 202011135220 A CN202011135220 A CN 202011135220A CN 112251265 A CN112251265 A CN 112251265A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/108—Production of gas hydrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
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Abstract
The application discloses a method for forming a hydrate by clay medium. The method for forming the hydrate by the clay medium comprises the following steps: providing a hydrate forming reactor and a clay sample, and placing the clay sample with a preset water content in the hydrate forming reactor; annealing, namely annealing the clay sample to loosen the internal structure of the clay sample; providing a cold source and a water source, wherein the cold source acts on the top of the clay sample to enable the clay sample to be frozen from the top to the bottom of the clay sample, and the water source provides water for the clay sample to form a plurality of layered fractional ice on the clay sample; providing high-pressure gas, closing the hydrate forming reactor, stopping water supply from a water source, and filling the high-pressure gas into the hydrate forming reactor; and providing a heat source, wherein the heat source acts on the bottom of the clay sample to melt the layered segregation ice formed by the clay sample from the bottom of the clay sample to the top of the clay sample. The technical scheme that this application provided it can solve the unable problem that gets into the inside hydrate that forms of clay of outside gas.
Description
Technical Field
The application relates to the technical field of hydrates, in particular to a method for forming hydrates by clay media.
Background
The gas hydrate is a compound composed of water molecules and gas molecules under high-pressure and low-temperature conditions. Under the conditions of proper low temperature and high pressure, water molecules form cage structures with different shapes and sizes through hydrogen bonding, and different kinds of gas molecules are trapped in the cage structures to form gas hydrates. Most of the component gases of natural gas can form hydrates including methane, carbon dioxide, hydrogen, and other gases of similar molecular size.
The natural gas hydrate is widely distributed in nature and has huge reserves, and is mainly distributed in ocean or fresh water lake sedimentary layers with the depth of more than 300m and permafrost layers. Research suggests that 20.7% of land and 90% of the ocean floor satisfy the temperature and pressure conditions required for natural gas hydrate formation, and the amount of carbon accumulated in global natural gas hydrates is estimated to be about twice as large as the total carbon reserve in traditional fossil energy sources (coal, oil, natural gas, oil shale, etc.). To date, at least 116 natural gas hydrate occurrence areas have been discovered globally, including land areas 38 (permafrost areas) and sea areas 78. Abundant methane hydrate reserves are distributed in China. In 2008, natural gas hydrate sample is found in permafrost region of Qilian mountain in Qinghai province; and in 2013, in the east sea area of the Zhujiang mouth basin in the coastal Guangdong, a high-purity natural gas hydrate sample is obtained by drilling in 6-9 months.
In order to scientifically utilize the energy with huge reserves, researchers at home and abroad carry out a great deal of research in laboratories aiming at various physical properties of the natural gas hydrate. Under natural conditions, natural gas hydrate mainly exists in various sediments, and pure hydrate exists in a large block form, and accounts for less than 6% of all hydrate resources. Therefore, the current research adopts the first formation of hydrate in various porous media, and then uses the synthesized sample to perform various researches.
In a real marine environment, the natural gas hydrate does not exist in quartz sand and silt media with large particles and good water permeability and air permeability. The survey results show that more than 90% of hydrates in the marine environment are present in clay or silty clay with fine particles, dense internal structure and very low permeability. However, since the internal particle structure of clay is very compact, external gas cannot enter the clay to form hydrate under conventional experimental conditions, and the in-situ formation of natural gas hydrate in the clay medium is a worldwide problem at present.
Disclosure of Invention
The application provides a method for forming a hydrate by a clay medium, which can solve the problem that external gas cannot enter clay to form the hydrate in the prior art.
The embodiment of the invention provides a method for forming a hydrate by clay medium, which comprises the following steps:
providing a hydrate forming reactor and a clay sample, and placing the clay sample with a preset water content in the hydrate forming reactor;
annealing, namely annealing the clay sample to loosen the internal structure of the clay sample;
providing a cold source and a water source, wherein the cold source acts on the top of the clay sample to enable the clay sample to be frozen from the top to the bottom of the clay sample, and the water source provides water for the clay sample to form a plurality of layered fractional ice on the clay sample;
providing high-pressure gas, closing the hydrate forming reactor, stopping water supply from a water source, and filling the high-pressure gas into the hydrate forming reactor;
and providing a heat source, wherein the heat source acts on the bottom of the clay sample to melt the layered segregation ice formed by the clay sample from the bottom of the clay sample to the top of the clay sample.
Above-mentioned in-process of realizing because clay has unique lamellar granular structure, carries out annealing treatment to the clay sample that has predetermined water content, can make the inside lamellar structure of clay sample form the orderly structure of long range, and then makes the inside occurrence liquid water of clay sample be lamellar horizontal distribution. Through implementing and providing cold source and water source step for the clay sample is by its top to its frozen in-process in bottom, and the lamellar horizontally liquid water that is then forms a large amount of vertical direction interval distribution of edge, and along the stratiform segregation ice of horizontal extension, and the clay sample can slowly expand under the effect of stratiform segregation ice, and the inside stratiform crack that forms a plurality of horizontal distributions of clay sample makes the inside compact structure of clay sample carry out fully loose, provides a large amount of gas passages for hydrate formation process. And (3) raising the temperature of the bottom of the clay sample by implementing a high-pressure gas step and a heat source providing step, and slowly melting the formed layered segregation ice layer by layer from the bottom to the top. Because the top and the bottom of the clay sample have a temperature difference, namely, the temperature of the bottom of the clay sample is above zero degrees centigrade, and the temperature of the top of the clay sample is below zero degrees centigrade, in the process of slowly raising the temperature of the bottom of the clay sample, a melting front (the temperature is about 0 ℃) appears in the clay sample, and the clay sample slowly moves upwards along the clay sample to melt the frozen solid ice layer by layer. In addition, before the process, layered segregation ice formed inside the clay sample is fully and stratically loosened in the horizontal direction on the inside of the clay sample, and a large number of large-size pore channels and transverse separation spaces are formed in the horizontal direction on the inside of the clay sample; therefore, in a closed hydrate forming reactor and in a high-pressure environment, in the process of melting layered segregation ice in the clay sample layer by layer from the bottom to the top of the clay sample, once the solid ice is melted, the solid ice immediately changes into a hydrate and starts to grow; meanwhile, the heat source acts on the bottom of the clay sample to heat the clay sample, so that liquid water at the bottom of the clay sample is driven to the melting frontal surface with lower temperature, a water source required by the growth process is provided for the formed hydrate, and the hydrate continuously grows. Finally, layered hydrates with different contents can be generated in the clay sample, and the problem that hydrates cannot be effectively formed in the clay is finally solved.
In an alternative embodiment, before the step of providing the cold source and the water source, the method for forming the hydrate by the clay medium further comprises the following steps:
the internal temperature of the hydrate formation reactor is stabilized such that the temperature at both the top and bottom of the clay sample is stabilized at a positive temperature.
The in-process of above-mentioned realization, before freezing the top of clay sample, can make the regulation to the bulk temperature of clay sample, guarantee that the top and the bottom of clay sample all are in same temperature, and this temperature is the positive value, does benefit to the clay sample and freezes to its bottom by its top, forms going on smoothly of stratiform partial condensation ice.
In an alternative embodiment, the water content of the clay sample is greater than 11.9 percent and less than 25.5 percent during the steps of providing the hydrate forming reactor and the clay sample.
In the implementation process, the plastic limit of the clay sample is 11.9 percent, the liquid limit of the clay sample is 22.5 percent, and the water content of the clay sample is controlled between 11.9 percent and 25.5 percent, so that the clay sample is ensured to be in a plastic state and a flowing state, and the clay sample meets the formation requirement of a hydrate.
In an alternative embodiment, in providing the cold source and the water source, the cold source has a temperature of-5 ℃ to-15 ℃.
In the implementation process, the temperature of the cold source is-5 ℃ to-15 ℃ to ensure that the clay sample is slowly frozen from top to bottom, so that the laminar fractional ice can be smoothly carried out; meanwhile, when the temperature of the cold source is-5 ℃, the stable formation of the layered segregation ice can be ensured, the good stability of the layered segregation ice can be ensured, when the temperature of the cold source is-15 ℃, the layered segregation ice can be rapidly formed, and the efficiency of forming the hydrate by the clay sample is improved.
In an alternative embodiment, the hydrate formation reactor is configured with a top platen, a piston-type push plate, and a drive mechanism;
the top pressing plate is arranged at the top of the hydrate forming reactor and is positioned in the hydrate forming reactor;
the piston type push plate is arranged in the hydrate forming reactor in a lifting way and is driven by the driving mechanism;
in the annealing step, the piston type push plate repeatedly goes up and down, and the clay sample is repeatedly extruded by matching with the top pressing plate so as to anneal the clay sample.
In the implementation process, the piston type push plate is driven by the driving mechanism to repeatedly perform lifting motion, and the clay sample is repeatedly extruded by matching with the propping of the top pressing plate so as to realize the annealing process of the clay sample; the annealing process is simple in structure, convenient to manufacture and low in cost, and is beneficial to smooth implementation of the method for forming the hydrate by the clay medium.
In an alternative embodiment, the hydrate formation reactor is configured with a bottom temperature-controlled circulation water tank and a top temperature-controlled circulation water tank;
the bottom temperature control circulating water tank is arranged at the bottom of the hydrate forming reactor, and the top temperature control circulating water tank is arranged at the top of the hydrate forming reactor;
in the step of providing the cold source and the water source, the cold source comprises a top temperature control circulating water tank;
in the step of providing the heat source, the heat source includes a bottom temperature-controlled circulating water tank.
In the implementation process, the bottom temperature control circulating water tank and the top temperature control circulating water tank work independently. Illustratively, in the step of providing the cold source and the water source, the top temperature-controlled circulating water tank is controlled to be at-10 ℃, so that the annealed and stabilized clay sample can be slowly frozen from the top; illustratively, in the step of providing the heat source, the bottom temperature-controlled circulating water tank is controlled to slowly increase the temperature of the circulating water tank, so that the formed layered fractional ice can be slowly melted layer by layer from the bottom to the top; meanwhile, it should be noted that the top temperature control circulating water tank and the bottom temperature control circulating water tank are simple in structure and simple to operate, and smooth implementation of the method for forming the hydrate by the clay medium is facilitated.
In an alternative embodiment, the hydrate forming reactor is provided with a water replenishing container, the water replenishing container is communicated with the interior of the hydrate forming reactor from the bottom of the hydrate forming reactor through a pipeline, and the pipeline is provided with a valve;
in the step of providing the cold source and the water source, the water source comprises a water replenishing container, and the water replenishing container is supplied with water from the bottom of the clay sample.
In the implementation process, the water replenishing container is simple in structure, and the water supply efficiency to the hydrate forming reactor is high, so that the water replenishing container is beneficial to supplying water to the clay sample; meanwhile, water is supplied from the bottom of the clay sample, so that a large amount of layered segregation ice is formed in the clay sample.
In an alternative embodiment, the hydrate formation reactor is provided with a high-pressure gas storage steel cylinder which is communicated with the hydrate formation reactor through a gas pipe, and the gas pipe is provided with an electromagnetic valve;
in the step of supplying the high pressure gas, the high pressure gas storage cylinder fills the hydrate formation reactor with the high pressure gas.
In the implementation process, the high-pressure gas is stored in the high-pressure gas storage steel cylinder, the high-pressure gas is communicated with the hydrate forming reactor through the control of the electromagnetic valve, and in the step of providing the high-pressure gas, the high-pressure gas can be rapidly filled into the hydrate forming reactor, so that a high-pressure environment is formed in the hydrate forming reactor, and the solid ice is enabled to be changed into the hydrate and grow.
In an alternative embodiment, the hydrate formation reactor is provided with an external incubator in which the hydrate formation reactor is located.
In the implementation process, the hydrate forming reactor is arranged in the external thermostat, so that the stability of the internal temperature of the hydrate forming reactor is ensured, and the interference of the outside on the formation of the hydrate is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a flow chart illustrating a method for forming a hydrate from a clay medium according to the present embodiment;
FIG. 2 is a schematic diagram illustrating the clay sample forming layered segregation ice during the step of providing the cold source and the water source;
FIG. 3 is a schematic diagram of a hydrate-forming reactor in this example.
Icon: 1A-freezing zone; 1B-unfrozen zone; 1C-freezing edge; 1D-layered fractional ice;
a 10-hydrate forming reactor; 11-a top platen; 12-piston push plate; 13-a drive mechanism; 14-bottom temperature-controlled circulating water tank; 15-top temperature control circulating water tank; 16-a water replenishing container; 17-high pressure gas storage steel cylinder; 18-a solenoid valve; 19-external oven.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, refer to the orientation or positional relationship as shown in the drawings, or as conventionally placed in use of the product of the application, or as conventionally understood by those skilled in the art, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solution in the present application will be described below with reference to the accompanying drawings.
The embodiment provides a method for forming a hydrate by using a clay medium, which can solve the problem that external gas cannot enter clay to form the hydrate in the prior art.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for forming a hydrate from a clay medium in this embodiment.
The method for forming the hydrate by the clay medium comprises the following steps:
providing a hydrate forming reactor and a clay sample, and placing the clay sample with a preset water content in the hydrate forming reactor;
annealing, namely annealing the clay sample to loosen the internal structure of the clay sample;
providing a cold source and a water source, wherein the cold source acts on the top of the clay sample to enable the clay sample to be frozen from the top to the bottom of the clay sample, and the water source provides water for the clay sample to form a plurality of layered fractional ice on the clay sample;
providing high-pressure gas, closing the hydrate forming reactor, stopping water supply from a water source, and filling the high-pressure gas into the hydrate forming reactor;
and providing a heat source, wherein the heat source acts on the bottom of the clay sample to melt the layered segregation ice formed by the clay sample from the bottom of the clay sample to the top of the clay sample.
Above-mentioned in-process of realizing, clay has unique lamellar granular structure, carries out annealing treatment to the clay sample that has predetermined water content, can make the inside lamellar structure of clay sample form the orderly structure of long range, and then makes the inside occurrence liquid water of clay sample be lamellar horizontal distribution. Through implementing and providing cold source and water source step for the clay sample is by its top to its frozen in-process in bottom, and the lamellar horizontally liquid water that is then forms a large amount of vertical direction interval distribution of edge, and along the stratiform segregation ice of horizontal extension, and the clay sample can slowly expand under the effect of stratiform segregation ice, and the inside stratiform crack that forms a plurality of horizontal distributions of clay sample makes the inside compact structure of clay sample carry out fully loose, provides a large amount of gas passages for hydrate formation process. Referring to fig. 2, fig. 2 is a schematic diagram illustrating clay samples forming layered ice during the step of providing the cold source and the water source. In fig. 2, a freezing zone 1A, an unfrozen zone 1B, a freezing edge 1C, and a layered partial-frozen ice 1D inside the clay sample are identified.
And (3) raising the temperature of the bottom of the clay sample by implementing a high-pressure gas step and a heat source providing step, and slowly melting the formed layered segregation ice layer by layer from the bottom to the top. Because the top and the bottom of the clay sample have a temperature difference, namely, the temperature of the bottom of the clay sample is above zero degrees centigrade, and the temperature of the top of the clay sample is below zero degrees centigrade, in the process of slowly raising the temperature of the bottom of the clay sample, a melting front (the temperature is about 0 ℃) appears in the clay sample, and the clay sample slowly moves upwards along the clay sample to melt the frozen solid ice layer by layer. In addition, before the process, layered segregation ice formed in the clay sample is fully and stratically loosened in the horizontal direction in the clay sample, and a large number of large-size pore channels and transverse separation spaces are formed in the clay sample in the horizontal direction, so that in a closed hydrate forming reactor and in a high-pressure environment, in a process of melting the layered segregation ice in the clay sample layer by layer from the bottom to the top of the clay sample, once the solid ice is melted, the solid ice immediately changes into a hydrate and starts to grow; meanwhile, the heat source acts on the bottom of the clay sample to heat the clay sample, so that liquid water at the bottom of the clay sample is driven to the melting frontal surface with lower temperature, a water source required by the growth process is provided for the formed hydrate, and the hydrate continuously grows. Finally, layered hydrates with different contents can be generated in the clay sample, and the problem that hydrates cannot be effectively formed in the clay is finally solved.
In the disclosure, before the step of providing the cold source and the water source, the method for forming the hydrate by the clay medium further comprises the following steps:
the internal temperature of the hydrate formation reactor is stabilized such that the temperature at both the top and bottom of the clay sample is stabilized at a positive temperature.
The in-process of above-mentioned realization, before freezing the top of clay sample, can make the regulation to the bulk temperature of clay sample, guarantee that the top and the bottom of clay sample all are in same temperature, and this temperature is the positive value, does benefit to the clay sample and freezes to its bottom by its top, forms going on smoothly of stratiform partial condensation ice.
In the present disclosure, in the step of providing the hydrate forming reactor and the clay sample, the water content of the clay sample is higher than 11.9 percent and lower than 25.5 percent.
In the implementation process, the plastic limit of the clay sample is 11.9 percent, the liquid limit of the clay sample is 22.5 percent, and the water content of the clay sample is controlled between 11.9 percent and 25.5 percent, so that the clay sample is ensured to be in a plastic state and a flowing state, and the clay sample meets the formation requirement of a hydrate. It should be noted that, in the present disclosure, the water content of the clay sample may be controlled to be 18%.
In the present disclosure, in the step of providing the cold source and the water source, the temperature of the cold source is-5 ℃ to-15 ℃.
In the implementation process, the temperature of the cold source is-5 ℃ to-15 ℃ to ensure that the clay sample is slowly frozen from top to bottom, so that the laminar fractional ice can be smoothly carried out; meanwhile, when the temperature of the cold source is-5 ℃, the stable formation of the layered segregation ice can be ensured, the good stability of the layered segregation ice can be ensured, when the temperature of the cold source is-15 ℃, the layered segregation ice can be rapidly formed, and the efficiency of forming the hydrate by the clay sample is improved. It should be noted that, in the present disclosure, the temperature of the cooling source may be-10 ℃.
Referring to fig. 3, fig. 3 is a schematic view of a hydrate forming reactor in the present embodiment.
Referring to fig. 3, a hydrate forming reactor 10 is configured with a top platen 11, a piston-type push plate 12, and a drive mechanism 13. A top platen 11 is provided at the top of and within the hydrate forming reactor 10. The piston-type push plate 12 is provided in the hydrate forming reactor 10 so as to be able to ascend and descend, and is driven by a driving mechanism 13.
In the annealing step, the piston-type push plate 12 repeatedly goes up and down to repeatedly extrude the clay sample in cooperation with the top press plate 11, so as to anneal the clay sample.
It should be noted that, in the annealing step, the internal structure of the clay sample can be observed by CT (computed tomography) technology to know whether the clay sample is annealed in place; or, through multiple tests in cooperation with a CT (computed tomography) technology, the relationship between the lifting times of the piston type push plate and the annealing degree of the clay sample is known, so that in the actual operation, the lifting times of the piston type push plate in the annealing step are determined.
In the implementation process, the piston type push plate 12 repeatedly performs lifting motion under the driving of the driving mechanism 13, and repeatedly extrudes the clay sample in cooperation with the abutting of the top pressing plate 11 so as to realize the annealing process of the clay sample; the annealing process is simple in structure, convenient to manufacture and low in cost, and is beneficial to smooth implementation of the method for forming the hydrate by the clay medium. The driving mechanism 13 may be a device capable of performing a lifting operation in the related art.
In the present disclosure, the hydrate forming reactor 10 is configured with a bottom temperature controlled circulating water tank 14 and a top temperature controlled circulating water tank 15. The bottom temperature-controlled circulating water tank 14 is provided at the bottom of the hydrate forming reactor 10, and the top temperature-controlled circulating water tank 15 is provided at the top of the hydrate forming reactor 10.
In the step of providing the cool source and the water source, the cool source includes a top temperature controlled circulation water tank 15.
In the step of providing a heat source, the heat source includes a bottom temperature-controlled circulating water tank 14.
In the above implementation process, the bottom temperature-controlled circulation water tank 14 and the top temperature-controlled circulation water tank 15 operate independently. Illustratively, in the step of providing the cold source and the water source, the top temperature-controlled circulating water tank 15 is controlled to have a temperature of-10 ℃, so that the annealed and stabilized clay sample can be slowly frozen from the top; illustratively, in the step of providing the heat source, the bottom temperature-controlled circulating water tank 14 is controlled to slowly increase the temperature thereof, so that the formed layered segregation ice can be slowly melted layer by layer from the bottom to the top; meanwhile, the top temperature-control circulating water tank 15 and the bottom temperature-control circulating water tank 14 are simple in structure and operation, and smooth implementation of a method for forming the hydrate by the clay medium is facilitated.
In the present disclosure, the hydrate formation reactor 10 is provided with a water replenishment container 16, and the water replenishment container 16 communicates with the inside of the hydrate formation reactor 10 from the bottom of the hydrate formation reactor 10 through a pipe. The pipeline is provided with a valve.
In the step of providing the cold source and the water source, the water source includes a refill container 16, and the refill container 16 is supplied with water from the bottom of the clay sample.
In the implementation process, the water replenishing container 16 is simple in structure, high in water supply efficiency to the hydrate forming reactor and beneficial to supplying water to the clay sample; meanwhile, water is supplied from the bottom of the clay sample, so that a large amount of layered segregation ice is formed in the clay sample.
In the present disclosure, the hydrate formation reactor 10 is provided with a high pressure gas storage cylinder 17, the high pressure gas storage cylinder 17 is connected to the hydrate formation reactor 10 through a gas pipe, and the gas pipe is provided with an electromagnetic valve 18.
In the step of supplying the high pressure gas, the high pressure gas storage cylinder 17 charges the hydrate formation reactor 10 with the high pressure gas.
In the implementation process, the high-pressure gas is stored in the high-pressure gas storage steel cylinder 17 and is controlled to be communicated with the hydrate forming reactor 10 through the electromagnetic valve 18, and in the step of providing the high-pressure gas, the high-pressure gas can be rapidly filled into the hydrate forming reactor 10, so that a high-pressure environment is formed in the hydrate forming reactor 10, and the solid ice is enabled to be changed into the hydrate and grow.
In the present disclosure, the gas stored in the high-pressure gas storage cylinder 17 is methane.
In the present disclosure, the hydrate forming reactor is provided with an external constant temperature tank 19, and the hydrate forming reactor 10 is provided in the external constant temperature tank 19.
In the implementation process, the hydrate forming reactor 10 is arranged in the external thermostat 19, so that the stability of the internal temperature of the hydrate forming reactor 10 is ensured, and the interference of the outside on the formation of the hydrate is avoided.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A method for forming hydrate by clay medium is characterized by comprising the following steps:
providing a hydrate forming reactor and a clay sample, and placing the clay sample with a preset water content in the hydrate forming reactor;
annealing, namely annealing the clay sample to loosen the internal structure of the clay sample;
providing a cold source and a water source, wherein the cold source acts on the top of the clay sample to enable the clay sample to start to freeze from the top to the bottom of the clay sample, and the water source provides water to the clay sample to form a plurality of layered fractional ice on the clay sample;
providing high-pressure gas, sealing the hydrate forming reactor, stopping water supply of the water source, and filling the high-pressure gas into the hydrate forming reactor;
providing a heat source, wherein the heat source acts on the bottom of the clay sample to melt the layered segregation ice formed by the clay sample from the bottom of the clay sample to the top of the clay sample.
2. The clay medium hydration method according to claim 1,
before the step of providing the cold source and the water source, the method for forming the hydrate by the clay medium further comprises the following steps:
stabilizing the internal temperature of the hydrate formation reactor such that the temperature at both the top and bottom of the clay sample is stabilized at a positive temperature.
3. The clay medium hydration method according to claim 1,
in the step of providing a hydrate forming reactor and a clay sample, the clay sample has a water content of more than 11.9 percent and less than 25.5 percent.
4. The clay medium hydrate forming method according to claim 1, wherein the temperature of the cold source is-5 ℃ to-15 ℃ in the step of providing the cold source and the water source.
5. The clay medium hydrate forming method as claimed in claim 1, wherein the hydrate forming reactor is provided with a top press plate, a piston type push plate and a driving mechanism;
the top pressing plate is arranged at the top of the hydrate forming reactor and is positioned in the hydrate forming reactor;
the piston type push plate is arranged in the hydrate forming reactor in a lifting manner and is driven by the driving mechanism;
in the annealing step, the piston type push plate repeatedly lifts and is matched with the top pressing plate to repeatedly extrude the clay sample so as to anneal the clay sample.
6. The clay medium hydration method according to claim 1,
the hydrate forming reactor is provided with a bottom temperature-controlled circulating water tank and a top temperature-controlled circulating water tank;
the bottom temperature-control circulating water tank is arranged at the bottom of the hydrate forming reactor, and the top temperature-control circulating water tank is arranged at the top of the hydrate forming reactor;
in the step of providing a cold source and a water source, the cold source comprises the top temperature-controlled circulating water tank;
in the step of providing the heat source, the heat source includes the bottom temperature-controlled circulating water tank.
7. The clay medium hydration method according to claim 1,
the hydrate forming reactor is provided with a water replenishing container, the water replenishing container is communicated with the interior of the hydrate forming reactor from the bottom of the hydrate forming reactor through a pipeline, and the pipeline is provided with a valve;
in the step of providing the cold source and the water source, the water source comprises the water replenishing container, and the water replenishing container is supplied with water from the bottom of the clay sample.
8. The clay medium hydration method according to claim 1,
the hydrate forming reactor is provided with a high-pressure gas storage steel cylinder which is communicated with the hydrate forming reactor through a gas pipe, and the gas pipe is provided with an electromagnetic valve;
in the step of supplying high pressure gas, the high pressure gas storage cylinder fills high pressure gas into the hydrate forming reactor.
9. The clay medium hydration method according to claim 1,
the hydrate forming reactor is configured with an external incubator in which the hydrate forming reactor is located.
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