CN109736754A - A kind of device and method using hot dry rock exploitation of gas hydrate - Google Patents
A kind of device and method using hot dry rock exploitation of gas hydrate Download PDFInfo
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- CN109736754A CN109736754A CN201910167071.3A CN201910167071A CN109736754A CN 109736754 A CN109736754 A CN 109736754A CN 201910167071 A CN201910167071 A CN 201910167071A CN 109736754 A CN109736754 A CN 109736754A
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Abstract
The invention belongs to exploitation of gas hydrates technical fields, are related to a kind of device and method using hot dry rock exploitation of gas hydrate, including two mouthfuls of water horizontal wells, a bite recovery well, a bite injection well, the channel of 2~3 connections hydrate layers and hot dry rock.Main flow is: (1) seawater being injected hot dry rock using high-pressure pump；(2) seawater after heating is injected by gas hydrates layer by pipeline, destroys balancing each other for gas hydrates, promotes gas hydrate dissociation；(3) natural gas extraction is come out using recovery well；(4)；Natural gas and water are separated using gas-liquid separation device, natural gas is used as the energy, and Water Spreading to injection well carries out secondary use.Advantage of the invention is that reducing the energy consumption of traditional heat shock method exploitation of gas hydrate using geothermal energy natural gas extraction hydrate.
Description
Technical field
The invention belongs to exploitation of gas hydrates technical fields, are related to a kind of utilization hot dry rock exploitation of gas hydrate
Device and method.
Background technique
With scientific in recent years, society high speed development, mankind's fossil higher and higher for the demand of the energy but traditional
The energy such as coal, petroleum etc. is fewer and fewer, it is difficult to meet the needs of the following human social development, therefore, find coal, petroleum etc.
The alternative energy source of the energy is extremely urgent.
Environmental problem has become one of sixty-four dollar question in the world now, with the high speed development in a nearly century, greatly
The burning of amount fossil energy causes serious environmental pollution, and to people's health, social development forms great danger
Evil, in order to improve environment, countries in the world have put into huge manpower and material resources, improve ball ecological environment with various methods,
In, clean energy resource is a highly effective mode.
Gas hydrates are the caged crystalline solids formed by small molecule hydrocarbon substance and water, wherein methane account for 80%~
99.9%, CO2 and water are only generated after burning, are a kind of good clean energy resourcies, while gas hydrates reserves are huge, now
The gas hydrates reserves verified are 7.6 × 1018M3, carbon content are about explored all fossil fuel carbon content summations
Two times.Gas hydrates are a kind of new energy that development prospect is wide.
It is scarce that traditional hydrate recovery method has heat shock method, decompression extraction system, chemical agent method, but these three methods respectively to have
It falls into, it is one using geothermal energy resources exploitation of gas hydrate that China, which contains at the South Sea gas hydrates and geothermal energy resources abundant,
The feasible method of kind.
Summary of the invention
The present invention provides a kind of methods using hot dry rock exploitation of gas hydrate, to exploit day using geothermal energy resources
Right gas hydrate provides a method, and can recycle to product, energy saving.
Technical scheme is as follows:
A kind of device using hot dry rock exploitation of gas hydrate, including high-pressure pump 1, sewage backflow pipeline 2, gas-liquid point
Go out pipeline 4, natural gas air accumulator 5, pipeline 10, the first perforation 11, first horizontal segment 12, thermal insulation layer from device 3, Gas Exploitation
13, the second perforation 14, the second horizontal segment 15, recovery well 16 and injection well 17；
The injection well 17 is L-type well, and arrival end connects high-pressure pump 1, and vertical section stretches in geothermal layer 9；Injection
The horizontal segment of well 17 is located in geothermal layer 9, is evenly equipped with multiple first perforations 11 thereon；
The recovery well 16 is L-type well, and arrival end connects gas-liquid separation device 3, and vertical section stretches to gas water
Object reservoir 7 is closed, the horizontal segment of recovery well 16 is located in gas hydrates reservoir 7, is evenly equipped with multiple second perforations 14 thereon；
It is rock formation 8, gas hydrates reservoir 7 and ground between the gas hydrates reservoir 7 and geothermal layer 9
It is equipped with the pipeline 10 for connecting geothermal layer 9 Yu gas hydrates reservoir 7 between thermosphere 9, is equipped with thermal insulation layer outside pipeline 10
13；
The high-pressure pump 1, sewage backflow pipeline 2, gas-liquid separation device 3, Gas Exploitation go out pipeline 4 and natural gas gas storage
Tank 5 is sequentially connected.
A method of using hot dry rock exploitation of gas hydrate, steps are as follows:
1) it selects there are hydrate layer and there are the sea areas of hot dry rock reservoir as production zone, the storage of target hot dry rock for lower section
Layer temperature chooses 150 DEG C；Suitable position is chosen in target sea area and beats a bite horizontal well to rock formation 8, as injection well 17, note
Enter well 17 through gas hydrates layer, horizontal segment is located at geothermal layer 9, carries out perforation to horizontal segment, forms the first perforation 11；?
Target sea area chooses suitable position and makes a bite directional well to gas hydrates reservoir 7, as recovery well 16, is similarly horizontal
Well, horizontal segment are located at gas hydrates reservoir 7, carry out perforation to horizontal segment, form the second perforation 14；Utilize 2~3 root canal roads
Gas hydrates reservoir 7 is connect with geothermal layer 9, thermal insulation layer 13 is wrapped up outside pipeline 10, prevents heat loss；
2) seawater is injected into geothermal layer 9 from injection well 17 with high-pressure pump 1, the seawater after heating is reached naturally by pipeline 10
Gas hydrate reservoir 7, gas hydrates decompose under the action of high temperature seawater；Gas hydrate dissociation product is through recovery well
It is recovered to sea, after gas-liquid separation device 3, obtains water and purer natural gas, natural gas is as energy storage and fortune
Defeated, sewage enters geothermal layer 9 by 16 re-injection of recovery well.
The beneficial effects of the invention are as follows geothermal energy resources and gas hydrates are joined together, exploited using geothermal energy natural
Gas hydrate reduces the energy consumption of conventional method exploitation of gas hydrate, meanwhile, injection well and exploitation well construction are simple, note
Water and extraction are easy to operate, reduce operation difficulty, provide a new way for the exploitation of gas hydrates.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of method using hot dry rock exploitation of gas hydrate
Wherein: 1 high-pressure pump；2 sewage backflow pipelines；3 gas-liquid separation devices；4 Gas Exploitations go out pipeline；5 natural gas gas storage
Tank；6 sea water layers；7 gas hydrates reservoirs；8 rock formations；9 geothermal layers (hot dry rock)；10 pipelines；11 first perforations；12
One horizontal segment；13 thermal insulation layers；14 second perforations；15 second horizontal segments；16 recovery wells；17 injection wells.
Specific embodiment
The present invention is described in detail below in conjunction with specific embodiment and attached drawing
1, reservoir is chosen
According to geologic information that is existing and being explored, there are below gas hydrates layer and gas hydrates layer for selection
There are the sea areas of hot dry rock reservoir as production zone, and target hot dry rock reservoir temperature chooses 150 DEG C, it is ensured that the seawater after heating
It can make gas hydrate dissociation under strata pressure.
2, a kind of specifically to be introduced using the method structure of hot dry rock exploitation of gas hydrate
(1) horizontal well is fetched water as injection well 17 to hot dry rock reservoir to carry out perforation to first horizontal segment 12, form first
Perforation 11；
(2) 17 well head of injection well connects high-pressure pump 1, and high-pressure pump 1 connects sewage backflow pipeline 2；
(3) it digs a directional well to gas hydrates reservoir, carries out perforation as recovery well 16, and to the second horizontal segment 15,
Form the second perforation 14；
(4) 16 well head of recovery well connects gas-liquid separation device 3, and gas-liquid separation device 3 connects sewage backflow pipeline 2 and natural
Gas produces pipeline 4, and Gas Exploitation goes out pipeline 4 and connects natural gas air accumulator 5；
(5) 8 pipe laying 10 of rock formation between gas hydrates reservoir 7 and geothermal layer 9, natural gas is hydrated
Object reservoir 7 is connected with geothermal layer 9, is flowed and is provided between gas hydrates reservoir 7 and geothermal layer 9 for seawater after heating
Channel installs thermal insulation layer 13 in pipeline periphery, reduces the heat loss for being heated rear fluid；
3, a kind of specific workflow of the method using hot dry rock exploitation of gas hydrate
(1) hydrofrac fluid is injected into geothermal layer 9 from injection well 17 using high-pressure pump 1, waterpower pressure is carried out to geothermal layer 9
Split, increase geothermal layer 9 hole, improve 9 permeability of geothermal layer, increase seawater and hot dry rock heat exchange area, increase seawater with
The heat exchange amount of hot dry rock.
(2) cold seawater is injected into geothermal layer 9 from injection well 17 using high-pressure pump 1, cold fluid pass through injection well 17 the
The first perforation 11 on one horizontal segment 12 enters geothermal layer 9, exchanges heat with hot dry rock, and cold ocean temperature increases；
(3) under the pressure difference effect between geothermal layer 9 and gas hydrates reservoir 7, the fluid being heated passes through pipe
Road 10 flows into gas hydrates reservoir 7, heats to gas hydrates, destroys the phase of gas hydrates in stratum
Equilibrium condition thermally decomposes gas hydrates；
(4) gas hydrate dissociation product enters recovery well 16 by the second perforation 14 of the second horizontal segment 15, passes through
Recovery well 16 is recycled to the gas-liquid separation device 3 on sea level；
(5) decomposition product for being transported to sea level obtains purer natural gas and dirt after gas-liquid separation device 3
Water, natural gas go out pipeline 4 by Gas Exploitation and are collected into natural gas air accumulator 5, and sewage passes through sewage backflow pipeline 2 again
Geothermal layer 9 is injected, is recycled.
Claims (2)
1. a kind of device using hot dry rock exploitation of gas hydrate, which is characterized in that described exploits day using hot dry rock
The device of right gas hydrate includes that high-pressure pump (1), sewage backflow pipeline (2), gas-liquid separation device (3), Gas Exploitation go out pipeline
(4), natural gas air accumulator (5), pipeline (10), the first perforation (11), first horizontal segment (12), thermal insulation layer (13), the second perforation
(14), the second horizontal segment (15), recovery well (16) and injection well (17)；
The injection well (17) is L-type well, and arrival end connects high-pressure pump (1), and vertical section stretches in geothermal layer (9)；Note
The horizontal segment for entering well (17) is located in geothermal layer (9), is evenly equipped with multiple first perforations (11) thereon；
The recovery well (16) is L-type well, and arrival end connects gas-liquid separation device (3), and vertical section stretches to gas water
It closes object reservoir (7), the horizontal segment of recovery well (16) is located in gas hydrates reservoir (7), is evenly equipped with multiple second thereon and penetrates
Hole (14)；
It is rock formation (8), gas hydrates reservoir (7) between the gas hydrates reservoir (7) and geothermal layer (9)
The pipeline (10) for connecting geothermal layer (9) Yu gas hydrates reservoir (7), pipeline (10) are equipped between geothermal layer (9)
Outside is equipped with thermal insulation layer (13)；
The high-pressure pump (1), sewage backflow pipeline (2), gas-liquid separation device (3), Gas Exploitation go out pipeline (4) and natural gas
Air accumulator (5) is sequentially connected.
2. a kind of method using hot dry rock exploitation of gas hydrate, which is characterized in that steps are as follows:
1) it selects there are hydrate layer and there are the sea areas of hot dry rock reservoir as production zone, target hot dry rock reservoir temperature for lower section
Degree chooses 150 DEG C；Suitable position is chosen in target sea area and beats a bite horizontal well, and as injection well (17), injection well (17) runs through
Gas hydrates layer, horizontal segment are located at geothermal layer (9), carry out perforation to horizontal segment, are formed the first perforation (11)；In target sea
Domain chooses suitable position and makes a bite directional well to gas hydrates reservoir (7), as recovery well (16), is similarly horizontal well,
Horizontal segment is located at gas hydrates reservoir (7), carries out perforation to horizontal segment, is formed the second perforation (14)；Utilize 2~3 root canals
Gas hydrates reservoir (7) is connect by road with geothermal layer (9), wraps up thermal insulation layer (13) outside in pipeline (10), prevents heat from dissipating
It loses；
2) seawater is injected into geothermal layer (9) from injection well (17) with high-pressure pump (1), the seawater after heating is reached by pipeline (10)
Gas hydrates reservoir (7), gas hydrates decompose under the action of high temperature seawater；Gas hydrate dissociation product warp
Recovery well is recovered to sea, after gas-liquid separation device (3), obtains water and purer natural gas, natural gas is as the energy
Storage and transport, sewage enter geothermal layer (9) by recovery well (16) re-injection.
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Cited By (2)
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| CN110805412A (en) * | 2019-10-15 | 2020-02-18 | 东北石油大学 | Dry-hot rock stratum and hydrate reservoir combined mining method |
| CN115126449A (en) * | 2021-03-24 | 2022-09-30 | 中国海洋石油集团有限公司 | Method and system for sea natural gas hydrate cyclic heat shock exploitation |
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| CN115126449A (en) * | 2021-03-24 | 2022-09-30 | 中国海洋石油集团有限公司 | Method and system for sea natural gas hydrate cyclic heat shock exploitation |
| CN115126449B (en) * | 2021-03-24 | 2023-06-20 | 中国海洋石油集团有限公司 | Method and system for cyclic heat shock exploitation of natural gas hydrate in sea area |
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