CN108915643A - Doubly-linked drifting structure and method for exploiting ocean hydrate - Google Patents
Doubly-linked drifting structure and method for exploiting ocean hydrate Download PDFInfo
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- CN108915643A CN108915643A CN201810716966.3A CN201810716966A CN108915643A CN 108915643 A CN108915643 A CN 108915643A CN 201810716966 A CN201810716966 A CN 201810716966A CN 108915643 A CN108915643 A CN 108915643A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/17—Interconnecting two or more wells by fracturing or otherwise attacking the formation
Abstract
The present invention relates to energy extraction fields, disclose a kind of doubly-linked drifting structure and method for exploiting ocean hydrate, doubly-linked drifting structure of the invention is by being arranged two connected wells being intervally arranged up and down in hydrate layer, pressure difference can be formed between two connected wells, under the action of pressure difference, it will form corresponding flow channel in hydrate layer, in favor of the flowing of fluid in injection fluid and hydrate layer, increase the contact area of injection fluid and hydrate layer, and the flowing of fluid can also drive the exchange of heat, so as to improve the heat transfer efficiency and flow conductivity of hydrate layer, promote the production efficiency of gas hydrates.In addition, heat injection method and displacement method are combined together by injecting carbon dioxide to hydrate layer, can further promote the production efficiency of gas hydrates, while maintaining the stability of reservoir by the present invention.
Description
Technical field
The present invention relates to energy extraction technical fields, more particularly to a kind of doubly-linked drifting for exploiting ocean hydrate
Structure and method.
Background technique
Since the industrial revolution, global energy demand just continues to increase, in recent years, with subtracting for conventional oil resource
Few, energy problem becomes increasingly severeer, and every country starts eye turning to unconventional energy resource.Wherein, gas hydrates
Resource is particularly subject to the concern of people.Gas hydrates are also combustible ice, are a kind of rich reserves, more clean new
The type energy.It is generated in conjunction with water mainly by natural gas at sufficiently low temperature and sufficiently high pressure.According to for many years
The investigation come finds that original gas hydrates are mainly distributed on the polar region tundra and the whole world of high latitude area in nature
In deep seafloor, Lu Po, continental rise and trench in range, extreme reservoir environment makes the gas hydrates in exploiting ocean
It is difficult.Under normal circumstances, first to try to make decomposition of hydrate, then acquire the natural gas of separate out again.
Currently, the method for exploitation of gas hydrate can be divided into heat injection method, voltage drop method, chemical agent method and dioxy
Change carbon displacement method.Wherein, heat injection method is the day being injected into the hot fluid with certain temperature using electric pump on ground in ocean
In right gas hydrate reservoir, or using underground heating methods such as fireflood, the system temperature in reservoir is promoted, gas water is promoted
Object is closed to decompose；Voltage drop method is to change balancing each other for hydrate to a certain extent by reducing reservoir system pressure, is promoted natural
Gas hydrate decomposes；Chemical agent method is the chemical agent by injecting methanol class, promotes gas hydrate dissociation；Carbon dioxide is set
The method of changing is the carbon dioxide by injecting certain pressure, temperature into reservoir from ground, displaces the first in gas hydrates
Alkane promotes gas hydrate dissociation.
Although above-mentioned four kinds of methods can be realized the exploitation of gas hydrates, the lower heat transfer efficiency of hydrate reservoir
It is so far still two hang-ups of exploitation of gas hydrate with flow conductivity.Therefore, reservoir heat transfer efficiency and water conservancy diversion how to be improved
Ability, to improve the production efficiency of gas hydrates, save the cost is the hot issue of current global concern.
Summary of the invention
The object of the present invention is to provide a kind of doubly-linked drifting structures and method for exploiting ocean hydrate, to improve storage
Layer heat transfer efficiency and flow conductivity, realize the high-efficiency mining of gas hydrates.
To achieve the goals above, one aspect of the present invention provides a kind of doubly-linked drifting knot for exploiting ocean hydrate
Structure, the doubly-linked drifting structure include that the first injection well, the second injection well and producing well of hydrate layer are extended to from sea level,
Wherein, first injection well is used for heated fluid injection or decomposition of hydrate for injecting carbon dioxide, second injection well
Promotor, the producing well are used to recycle the decomposition product of the hydrate layer；
The doubly-linked drifting structure further includes the first connected well and the second connected well positioned at the hydrate layer, and described the
One connected well is spaced on the lower section of second connected well, wherein：The arrival end of first connected well and described first
The outlet end of injection well is connected to, and the outlet end of first connected well is connected to the arrival end of the producing well, and described first connects
Drifting is used to the carbon dioxide being injected up the hydrate layer, is collected simultaneously the decomposition product of the hydrate layer；Institute
The arrival end for stating the second connected well is connected to the outlet end of second injection well, the outlet end of second connected well with it is described
The arrival end of producing well is connected to, and second connected well is used to the hot fluid or decomposition of hydrate promotor being injected downwardly into institute
Hydrate layer is stated, the decomposition product of the hydrate layer is collected simultaneously.
Preferably, first connected well and second connected well are all formed as horizontal well.
Preferably, the central axis of second connected well is located at the 1/6-1/8 of the top surface apart from the hydrate layer,
The central axis of first connected well is located at the 1/6-1/8 of the bottom surface apart from the hydrate layer.
Preferably, first connected well and second connected well are all made of screen casing；Or
Multiple first apertures are offered on the roof of first connected well, multiple first aperture is along first connection
The extending direction of well is intervally arranged；Multiple second apertures, multiple second aperture are offered on the bottom wall of second connected well
Extending direction along second connected well is intervally arranged.
Preferably, the doubly-linked drifting structure includes for improving the pressurization into the first connected well fluid pressure
Device.
Preferably, the supercharging device is located at the outlet end of first injection well or the arrival end of first connected well
Place, the supercharging device are set as that first injection well is blocked to be connected to the direct of the first connected well, the pressurization dress
Set the nozzle including being in seedpod of the lotus shape, the entrance of the nozzle is connected to first injection well, the spout of the nozzle with it is described
The connection of first connected well.
Another aspect of the present invention provides a kind of method for exploiting ocean hydrate, the method includes：
S1, from two different heights of hydrate layer along opposite direction heat is injected simultaneously into the hydrate layer respectively
Fluid or decomposition of hydrate promotor and carbon dioxide, to form flow channel in the hydrate layer；
S2, the decomposition product that the hydrate layer is collected from described two different heights.
Preferably, the S1 includes：With 300~400m3The hot-fluid that the speed injection temperature of/day is 80 DEG C~90 DEG C
Body or decomposition of hydrate promotor, with 200~300m3The carbon dioxide that the speed injection temperature of/day is 60 DEG C~90 DEG C；
And/or
The decomposition of hydrate promotor use mass concentration for 5%~25% salt water.
Preferably, the method includes：When the stable yield of the decomposition product, to reduce by 2%~5% speed daily
Rate adjusts the injection rate of the hot fluid or decomposition of hydrate promotor and the carbon dioxide respectively.
Preferably, the method uses above-described doubly-linked drifting structure.
Doubly-linked drifting structure of the invention is by being arranged two connected wells being intervally arranged up and down, Neng Gou in hydrate layer
Pressure difference is formed between two connected wells, will form corresponding flow channel under the action of pressure difference, in hydrate layer, in favor of note
Enter the flowing of fluid in fluid and hydrate layer, increases the contact area of injection fluid and hydrate layer, and the flowing of fluid
The exchange of heat can also be driven, so as to improve the heat transfer efficiency and flow conductivity of hydrate layer, promotes natural gas hydration
The production efficiency of object.In addition, heat injection method and displacement method are incorporated in one by injecting carbon dioxide to hydrate layer by the present invention
It rises, can further promote the production efficiency of gas hydrates, while maintaining the stability of reservoir.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of structural schematic diagram of embodiment of doubly-linked drifting structure in the present invention；
Fig. 2 is a kind of structural schematic diagram of embodiment of supercharging device in the present invention.
Description of symbols
10 first injection well, 101 first injection well well head
11 second injection well, 111 second injection well well head
12 producing well, 121 producing well well head
13 first connected well, 14 second connected well
15 supercharging device, 151 nozzle
152 shell, 153 sealing element
20 sea level, 21 hydrate layer
22 cap rock, 23 stratum
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower ", which typically refers to installation, to be made
With upper and lower under state." inside and outside " refers to relative to the inside and outside of each component profile itself.
In the present invention, in order to make it easy to understand, the internal structure of ocean to be simply divided into the sea being from top to bottom sequentially distributed
Plane 20, sea water layer, cap rock 22, hydrate layer 21 and stratum 23.
One aspect of the present invention provides a kind of doubly-linked drifting structure for exploiting ocean hydrate, the doubly-linked drifting structure
The first injection well 10, the second injection well 11 and producing well 12 including extending to hydrate layer 21 from sea level 20, wherein described
First injection well 10 promotes for injecting carbon dioxide, second injection well 11 for heated fluid injection or decomposition of hydrate
Agent, the producing well 12 are used to recycle the decomposition product of the hydrate layer 21；The doubly-linked drifting structure further includes being located at institute
The first connected well 13 and the second connected well 14 of hydrate layer 21 are stated, first connected well 13 is spaced on described second and connects
The lower section of drifting 14, wherein：The arrival end of first connected well 13 is connected to the outlet end of first injection well 10, described
The outlet end of first connected well 13 is connected to the arrival end of the producing well 12, and first connected well 13 is used for the dioxy
Change carbon and be injected up the hydrate layer 21, is collected simultaneously the decomposition product of the hydrate layer 21；Second connected well 14
Arrival end be connected to the outlet end of second injection well 11, the outlet end of second connected well 14 and the producing well 12
Arrival end connection, second connected well 14 is used to the hot fluid or decomposition of hydrate promotor being injected downwardly into the water
Nitride layer 21 is closed, the decomposition product of the hydrate layer 21 is collected simultaneously.
That is, the carbon dioxide injected by the first injection well 10 can be discharged through the first connected well 13 to hydrate layer 21
In, the hot fluid or decomposition of hydrate promotor injected by the second injection well 11 can be discharged through the second connected well 14 to hydrate layer
In 21, and the decomposition product in hydrate layer 21 can be collected by the first connected well 13 and the second connected well 14 and enter producing well
To be recycled in 12.
Doubly-linked drifting structure of the invention is by being arranged be intervally arranged up and down two connected wells (i.e. in hydrate layer 21
One connected well 13 and the second connected well 14), since the first connected well 13 and the second connected well 14 are located at the difference of hydrate layer 21
Highly, therefore between the first connected well 13 and the second connected well 14 it will form pressure difference, under the action of pressure difference, in hydrate layer 21
(i.e. region between the first connected well 13 and the second connected well 14) will form corresponding flow channel, in favor of injection fluid and
The flowing of fluid in hydrate layer increases the contact area of injection fluid and hydrate layer, and the flowing of fluid can also band
The exchange of dynamic heat promotes the exploitation of gas hydrates so as to improve the heat transfer efficiency and flow conductivity of hydrate layer
Efficiency.In addition, heat injection method and displacement method are combined together, Neng Goujin by the present invention by injecting carbon dioxide to hydrate layer
One step promotes the production efficiency of gas hydrates, while maintaining the stability of reservoir.
Wherein, as shown in Figure 1, make the first connected well 13 in the vertical direction be located at the second connected well 14 lower section, according to
The biggish hot fluid of density flows downward, and the principle that the lesser gas of density flows up can flow up conducive to carbon dioxide,
Hot fluid or decomposition of hydrate promotor flow downward, to accelerate the formation of flow channel, and injection fluid and hydrate
The effect of layer.
In the present invention, first connected well 13 and second connected well 14 are formed as horizontal well.In this way, can benefit
It is released energy by way of heat transfer and convective heat transfer in the first connected well 13 and the second connected well 14, promotes hydrate point
Solution, is collected simultaneously decomposition product.It additionally can be shortened completion period, reduce well-digging cost, save mining time.
In addition, the first injection well 10, the second injection well 11 and producing well 12 be also respectively provided with the first injection well well head 101,
Second injection well well head 111 and producing well well head 121, in order to the injection of fluid and the recycling of decomposition product.In addition, first
Injection well 10, the second injection well 11 and producing well 12 are preferably formed into Vertical Well, herein it should be noted that the first injection well
10, the second injection well 11 and producing well 12 can not only include vertical section, for the ease of the connection between drilling well, well and well with
And actual effect, such as shown in Fig. 1, the first injection well 10, the second injection well 11 and producing well 12 can also respectively include horizontal segment.
Further, preferably, the central axis of second connected well 14 is located at apart from the hydrate layer 21
At the 1/6-1/8 of top surface, the central axis of first connected well 13 is located at the 1/6- of the bottom surface apart from the hydrate layer 21
At 1/8.By above-mentioned setting, the maximum area between the first connected well 13 and the second connected well 14 can be made, it being capable of maximum limit
Degree ground exploitation of gas hydrate, while guaranteeing effective collection of decomposition product.In addition, it should be noted that, 1/6-1/8 refers to
The 1/6-1/8 of the height of hydrate layer 21.
In addition, a kind of embodiment according to the present invention, first connected well 13 and second connected well 14
Using screen casing.It is understood that being furnished with multiple through-holes on the tube wall of screen casing, managing inside and outside fluid can be passed in and out by the through-hole
(referring to Fig. 1).By using screen casing, heat-transfer effect can be enhanced with the heat transfer and convective heat transfer of outer fluid in reinforced pipe, and
Under certain flow rate, local depression can be generated in screen casing, entered in screen casing conducive to the decomposition product in hydrate layer 21.This feelings
Under condition, injection fluid can be released from the surrounding of the first connected well 13 and the second connected well 14 respectively, when collecting decomposition product,
Decomposition product can enter the first connected well 13 and the second connected well from the surrounding of the first connected well 13 and the second connected well 14 respectively
In 14.That is, first connected well 13 is connected to second in addition to the region between the first connected well 13 and the second connected well 14
Well 14 can also inject fluid from other directions to hydrate layer 21, to promote the natural gas in 21 other regions of hydrate layer to be hydrated
The decomposition of object.
Another embodiment according to the present invention offers multiple first on the roof of first connected well 13 and opens
Hole, multiple first aperture are intervally arranged along the extending direction of first connected well 13；The bottom wall of second connected well 14
On offer multiple second apertures, multiple second aperture is intervally arranged along the extending direction of second connected well 14.At this
In the case of kind, the first connected well 13 and the second connected well 14 can only connect to first connected well 13 and second that is located at of hydrate layer 21
Fluid is injected in region between drifting 14.
In the present invention, the doubly-linked drifting structure, which may also include, enters fluid pressure in first connected well 13 for improving
The supercharging device 15 of power, in this way can be in favor of the formation of flow channel.
A kind of embodiment according to the present invention, the supercharging device 15 may be disposed at the outlet of first injection well 10
At the arrival end of end or first connected well 13, the supercharging device 15 is set as blocking first injection well 10 and described
The direct connection of first connected well 13, the supercharging device 15 include the nozzle 151 in seedpod of the lotus shape, the entrance of the nozzle 151
It is connected to first injection well 10, the spout of the nozzle 151 is connected to first connected well 13.Specifically, such as Fig. 2 institute
Show, the rotary table that the inside of nozzle 151 defines cylindrical cavity and is gradually increased from the outwardly extending internal diameter in one end of the cylindrical cavity
Chamber, cylindrical cavity and rotary table chamber are coaxially disposed, and one end (i.e. left end in Fig. 2) of the separate rotary table chamber of cylindrical cavity forms nozzle 151
Entrance, one end (i.e. right end in Fig. 2) of the separate cylindrical cavity of rotary table chamber is formed with multiple spouts.In addition, in order to realize pair
The protection of nozzle 151 and the first injection well 10 of blocking are connected to the first the direct of connected well 13, and the supercharging device 15 may be used also
Including the shell 152 that is sheathed on outside nozzle 151 and the sealing element 153 being set to outside shell 152, sealing element 153 is set as and the
The sealing cooperation of the inner wall of one injection well 10 or the first connected well 13.That is, the fluid from the first injection well 10 can only be by
The entrance of nozzle 151 enters in cylindrical cavity, since the diameter of cylindrical cavity is less than the internal diameter of the first injection well 10, will increase stream
Body flow velocity, causes local depression at this, in favor of decomposition of hydrate；And fluid will form bubble flow when passing through spout,
It is more easily contacted with hydrate layer 21, to be conducive to the progress of exploitation.
Another aspect of the present invention provides a kind of method for exploiting ocean hydrate, the method includes：
S1, it is infused simultaneously into the hydrate layer 21 from two different heights of hydrate layer 21 along opposite direction respectively
Enter hot fluid or decomposition of hydrate promotor and carbon dioxide, to form flow channel in the hydrate layer 21；
S2, the decomposition product that the hydrate layer 21 is collected from described two different heights.
The above method of the invention by respectively from two different heights of hydrate layer 21 along opposite direction to described
In hydrate layer 21 simultaneously heated fluid injection or decomposition of hydrate promotor and carbon dioxide, can in hydrate layer 21 shape
At flow channel, so as to improve the heat transfer efficiency and flow conductivity of hydrate layer, the exploitation effect of gas hydrates is promoted
Rate；By collecting the decomposition product of hydrate layer 21 from described two different heights, the same of decomposition product can be effectively collected
When reduce hydrate cost of winning.It should be noted that can to the specific explanations of the above method of the present invention effect achieved
Referring to the explanation in above-mentioned doubly-linked drifting structure.
Wherein, preferably, the S1 includes：With 300~400m3The speed injection temperature of/day is 80 DEG C~90 DEG C
The hot fluid or decomposition of hydrate promotor, with 200~300m3The speed injection temperature of/day is 60 DEG C~90 DEG C described
Carbon dioxide.Wherein, carbon dioxide is easier to replace with gas hydrates under the high temperature conditions, the high temperature heat dissipation of fluid
It is also advantageous for improving the lower heat transfer efficiency of hydrate reservoir, promotes the decomposition of hydrate, meanwhile, as heat is constantly passed
It goes out, the pressure of carbon dioxide can also be declined, and the phase balance of hydrate is changed, and improve the exploitation effect of hydrate reservoir
Rate.
In addition, the decomposition of hydrate promotor preferably use mass concentration for 5%~25% salt water.
In recovery process, at injection initial stage, the ability of the carbon dioxide replacement methane under hot conditions is stronger, in transmitting heat
While amount, the decline of temperature also results in pressure reduction, while distributing thermal energy or hydrate in upper and lower connected well injection fluid
Under the multidrive of decomposition accelerating agent, gas hydrates can start to decompose, and decompose pressure of the gas in upper and lower connected well of generation
Difference effect is lower to be entered in connected well, while forming flow channel in hydrate layer 21；Through exploitation after a period of time, with dampening
The continuous decomposition of object is closed, hydrate layer 21 and the contact area of injection fluid constantly increase, to effectively improve hydrate
The heat and mass efficiency of layer 21；After exploiting a period of time, hydrate layer 21 and the contact area of injection fluid gradually tend towards stability,
When the yield of decomposition product in hydrate layer 21 tends towards stability, the heat is adjusted respectively with the rate for reducing 2%~5% daily
The injection rate of fluid or decomposition of hydrate promotor and the carbon dioxide, this process had both controlled daily production gas
Amount, and constantly reduced due to injecting Fluid Volume in pit shaft, gas proportion relative increase, causes pressure persistently to drop in fluid
It is low, and then decompression exploitation is realized, the production efficiency of hydrate is improved, ensure that the stability of exploitation.
In the present invention, above-described doubly-linked drifting structure is can be used in the method, and any other energy can also be used certainly
Enough realize the structure or device of the above method.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (10)
1. a kind of doubly-linked drifting structure for exploiting ocean hydrate, which is characterized in that
The doubly-linked drifting structure includes the first injection well (10) that hydrate layer (21) is extended to from sea level (20), the second note
Enter well (11) and producing well (12), wherein first injection well (10) is for injecting carbon dioxide, second injection well
(11) it is used for heated fluid injection or decomposition of hydrate promotor, the producing well (12) to be for recycling the hydrate layer (21)
Decomposition product；
The doubly-linked drifting structure further includes the first connected well (13) and the second connected well positioned at the hydrate layer (21)
(14), first connected well (13) is spaced on the lower section of second connected well (14), wherein：First connected well
(13) arrival end is connected to the outlet end of first injection well (10), the outlet end of first connected well (13) with it is described
The arrival end of producing well (12) is connected to, and first connected well (13) is used to the carbon dioxide being injected up the hydrate
Layer (21), is collected simultaneously the decomposition product of the hydrate layer (21)；The arrival end of second connected well (14) and described the
The outlet end of two injection wells (11) is connected to, and the outlet end of second connected well (14) and the arrival end of the producing well (12) connect
Logical, second connected well (14) is used to the hot fluid or decomposition of hydrate promotor being injected downwardly into the hydrate layer
(21), it is collected simultaneously the decomposition product of the hydrate layer (21).
2. doubly-linked drifting structure according to claim 1, which is characterized in that first connected well (13) and described second
Connected well (14) is all formed as horizontal well.
3. doubly-linked drifting structure according to claim 2, which is characterized in that the central axis of second connected well (14)
At the 1/6-1/8 of the top surface apart from the hydrate layer (21), the central axis of first connected well (13) be located at away from
At the 1/6-1/8 of bottom surface from the hydrate layer (21).
4. doubly-linked drifting structure according to claim 2, which is characterized in that first connected well (13) and described second
Connected well (14) is all made of screen casing；Or
Multiple first apertures are offered on the roof of first connected well (13), multiple first aperture is along first connection
The extending direction of well (13) is intervally arranged；Multiple second apertures are offered on the bottom wall of second connected well (14), it is multiple
Second aperture is intervally arranged along the extending direction of second connected well (14).
5. doubly-linked drifting structure described in any one of -4 according to claim 1, which is characterized in that the doubly-linked drifting structure
Including for improving the supercharging device (15) into the first connected well (13) fluid pressure.
6. doubly-linked drifting structure according to claim 5, which is characterized in that the supercharging device (15) is located at described first
At the arrival end of the outlet end of injection well (10) or first connected well (13), the supercharging device (15) is set as blocking institute
Direct being connected to of the first injection well (10) with first connected well (13) is stated, the supercharging device (15) includes in seedpod of the lotus shape
Nozzle (151), the entrance of the nozzle (151) are connected to first injection well (10), the spout of the nozzle (151) and institute
State the first connected well (13) connection.
7. a kind of method for exploiting ocean hydrate, which is characterized in that the method includes：
S1, it is infused simultaneously in the hydrate layer (21) from two different heights of hydrate layer (21) along opposite direction respectively
Enter hot fluid or decomposition of hydrate promotor and carbon dioxide, to form flow channel in the hydrate layer (21)；
S2, the decomposition product that the hydrate layer (21) is collected from described two different heights.
8. the method according to the description of claim 7 is characterized in that the S1 includes：With 300~400m3The speed of/day is injected
The hot fluid or decomposition of hydrate promotor that temperature is 80 DEG C~90 DEG C, with 200~300m3The speed of/day injects temperature
For 60 DEG C~90 DEG C of the carbon dioxide；And/or
The decomposition of hydrate promotor use mass concentration for 5%~25% salt water.
9. according to the method described in claim 8, it is characterized in that, the method includes：When the yield of the decomposition product is steady
Periodically, the hot fluid or decomposition of hydrate promotor and the dioxy are adjusted respectively to reduce by 2%~5% rate daily
Change the injection rate of carbon.
10. the method according to any one of claim 7-9, which is characterized in that the method uses claim 1-6
Any one of described in doubly-linked drifting structure.
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| CN110043229A (en) * | 2019-04-02 | 2019-07-23 | 广州海洋地质调查局 | A kind of more well group connection convergence recovery methods of Gas Hydrate In Sea Areas |
| CN111271035A (en) * | 2020-02-13 | 2020-06-12 | 中国石油大学(华东) | Natural gas hydrate exploitation well structure |
| CN114542021A (en) * | 2022-01-27 | 2022-05-27 | 华南理工大学 | Thermochemical method for enhancing CO2Replacement mining of CH4Apparatus and method for hydrate |
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