CN109882133A - A kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates - Google Patents
A kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates Download PDFInfo
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- CN109882133A CN109882133A CN201910167074.7A CN201910167074A CN109882133A CN 109882133 A CN109882133 A CN 109882133A CN 201910167074 A CN201910167074 A CN 201910167074A CN 109882133 A CN109882133 A CN 109882133A
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Abstract
The invention belongs to exploitation of gas hydrates technical fields, provide a kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates, including two mouthfuls of wells, a bite injection well is horizontal well, a bite recovery well, for bi-lateral horizontal well, one branch is located at gas hydrates layer, and another branch is located at discarded gas reservoir, carries out perforation to recovery well vertical section in hydrate layer.Primary operational process: (1) using pump seawater is injected into discarded gas reservoir, hydrate layer is flowed by recovery well branch after heating, thermally decomposes gas hydrates, generated natural gas is mined through recovery well, using gas-liquid separation device, purer natural gas is obtained.It is an advantage of the invention that discarding gas reservoir exploitation gas hydrates using high temperature, energy consumption is reduced, while being exploited using original well, reduced costs.
Description
Technical field
The invention belongs to exploitation of gas hydrates technical fields, are related to a kind of utilize and discard high temperature and pressure gas reservoir exploitation day
The device and method of right gas hydrate.
Background technique
Gas hydrates are also known as combustible ice, are a kind of to be had by what hydrocarbons and water were formed under the conditions of cryogenic high pressure
The substance of caged crystal structure, only generates CO2 and water after burning, no pollution to the environment, while hydrocarbon contains in gas hydrates
Amount is very high, and wherein methane accounts for about 80%~99.9%, and it is a kind of very good energy that calorific value is high, can be used for substituting increasingly tight
Scarce traditional fossil energy such as coal, petroleum, natural gas.The common method of exploitation of gas hydrate is heat shock method, voltage drop method,
Chemical-agent technique.However the economy of these three methods is bad, face cost is high.
It will do it shut-in well after the completion of traditional natural gas gas reservoir exploitation, then look for next gas reservoir and continue to exploit, however
For part high temperature and pressure gas reservoir after producing natural gas, reservoir interior rock temperature is very high, at the same reservoir interior rock by
Pressure break, porosity and permeability is all very high, can regard a good geothermal energy resources reservoir as and extract natural gas in addition to this
Equipment is slightly modified to can be used to mining geothermal energy, considerably reduces economic cost, therefore can use discarded high temperature and pressure
For gas reservoir as heat source exploitation of gas hydrate, structure is simple, easy to operate, at low cost, good economy performance.
Summary of the invention
The present invention provides a kind of methods using discarded high temperature and pressure gas reservoir exploitation gas hydrates, reduce tradition
The cost of method exploitation of gas hydrate, meanwhile, realize the secondary use to discarded high temperature and pressure gas reservoir.
Technical solution of the present invention:
A kind of device using discarded high temperature and pressure gas reservoir exploitation gas hydrates, including high-pressure pump 1, sewage backflow pipe
Road 2, gas-liquid separation device 3, Gas Exploitation go out pipeline 4, natural gas air accumulator 5, recovery well 6, first horizontal segment 7, the first perforation
8, bridge plug 9, the second perforation 10, the second horizontal segment 11 and injection well 17；
17 arrival end of injection well connects high-pressure pump 1, and outlet end is located at rock stratum 12 where discarded gas reservoir；
The recovery well 6 is bi-lateral horizontal well, and the outlet end of vertical section connects gas-liquid separation device 3, first level
Section 7 and the second horizontal segment 11 are connected with vertical section, are located at rock where gas hydrates reservoir 15 and discarded gas reservoir
Layer 12；It is equipped with bridge plug 9 and the second perforation 10 positioned at the vertical section of gas hydrates reservoir 15, bridge plug 9 and the second perforation 10 are
Positioned at 7 lower section of first horizontal segment, bridge plug 9 is located at 10 top of the second perforation；Multiple first perforations 8 are evenly equipped in first horizontal segment 7；
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 discarded high temperature and pressure gas reservoir exploitation gas hydrates, steps are as follows:
1) seabed is chosen to contain gas hydrates while nearby there is the sea area of discarded high temperature and pressure gas reservoir as mesh
Sea area is marked, wherein discarded gas reservoir rock temperature > 150 DEG C；Using original natural gas extraction well as injection well 17；In gas water
It closes object reservoir 15 and beats a bite bi-lateral horizontal well as recovery well 6, a horizontal branch is located at gas hydrates reservoir 15, separately
One horizontal branch is connected to discarded gas reservoir 13；It is equipped in vertical section of the recovery well 6 close to 15 bottom of gas hydrates reservoir
Second perforation 10, and recovery well 6 is blocked with bridge plug 9 at 10 3~5m of top of the second perforation；The of gas hydrates reservoir 15
One horizontal segment 7 is located at the following place 3~5m in the top of gas hydrates reservoir 15, and carries out perforation to first horizontal segment 7, formation the
One perforation 8；
2) seawater is injected into discarded gas reservoir 13 from injection well 17 with high-pressure pump 1, seawater is in discarded gas reservoir 13 and day after heating
The second horizontal segment 11 and the second perforation 10 under the pressure difference effect of right gas hydrate reservoir 15 through recovery well 6 reach gas water
Object reservoir 15 is closed, gas hydrates are thermally decomposed；Decomposition product is returned through the first horizontal segment 7 and vertical section of bi-lateral horizontal well
It receives to sea, purer natural gas is obtained after gas-liquid separation device 3, produced-water reinjection enters recovery well 6 and recycled.
Beneficial effects of the present invention: the method that high temperature and pressure gas reservoir exploitation gas hydrates are discarded in utilization of the invention is
Using the gas reservoir of obsolete high temperature and pressure as heat source exploitation of gas hydrate, the secondary use of discarded gas reservoir is realized,
The energy consumption of heat shock method exploitation of gas hydrate is reduced, while using discarded gas reservoir exploitation gas extraction well as sea
Water injection well, reduces equipment cost and difficulty of processing.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of method using discarded high temperature and pressure gas reservoir exploitation gas hydrates.
In figure: 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 recovery wells；7 first horizontal segments；8 first perforations；9 bridge plugs；10 second perforations；11 second horizontal segments；Where 12 discarded gas reservoirs
Rock stratum；13 discarded gas reservoirs；Rock stratum where 14 discarded gas reservoirs between rock stratum and gas hydrates reservoir；15 gas hydrates
Reservoir；16 sea water layers；17 injection wells.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
Embodiment
(1) reservoir is chosen: according to the address details and existing equipment situation explored, choosing seabed and contains gas water
It closes object and nearby there is the sea area for discarding high temperature and pressure gas reservoir simultaneously as target sea area, wherein discarded gas reservoir rock temperature > 150
℃；It is injection well 17 using the original natural gas extraction well of discarded gas reservoir 13, high-pressure pump 1 is connected at well head, high-pressure pump 1 connects
Sewage backflow pipeline 2；Appropriate orientation is chosen above gas hydrates reservoir 15 beats a bite bi-lateral horizontal well as exploitation
Well 6, wherein first horizontal segment 7 is located at gas hydrates layer 15, and carries out perforation to first horizontal segment 7, forms the first perforation
8, rock stratum 12 where the second horizontal segment 11 is located at discarded gas reservoir extends to discarded gas reservoir 13；It is hydrated in recovery well 6 close to natural gas
The vertical section of 15 bottom of nitride layer carries out perforation, forms the second perforation 10, and the place 3~5m installation bridge plug 9, is sealed above the second perforation 10
Stifled recovery well 6；6 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
Pipeline 4 is produced, Gas Exploitation goes out pipeline 4 and connects natural gas air accumulator 5；
(2) cold seawater is injected into discarded gas reservoir 13, cold seawater and discarded gas reservoir rock from injection well 17 using high-pressure pump 1
Layer 13 exchanges heat, and temperature increases；Seawater after being heated flows into day through the second perforation 10 by the second horizontal segment 11 from discarded gas reservoir
Right gas hydrate reservoir 15, gas hydrates exchange heat with hot fluid, destroy the phase balance condition of gas hydrates,
Gas hydrates are thermally decomposed, natural gas and water are generated；The natural gas and water that gas hydrate dissociation generates are by the
One perforation 8, the gas-liquid separation device 3 being recycled to by the first horizontal segment 7 of recovery well 6 on sea level；It is recycled on sea level
Through gas-liquid separation device 3, obtained natural gas goes out pipeline 4 by Gas Exploitation and is stored in natural gas air accumulator 5 mixture, makees
All over the world for energy resource supply, sewage refills discarded gas reservoir 13 by sewage backflow pipeline 2, is recycled.
Claims (2)
1. a kind of device using discarded high temperature and pressure gas reservoir exploitation gas hydrates, which is characterized in that the utilization is useless
The device for abandoning high temperature and pressure gas reservoir exploitation gas hydrates includes high-pressure pump (1), sewage backflow pipeline (2), gas-liquid separation dress
Set (3), Gas Exploitation goes out pipeline (4), natural gas air accumulator (5), recovery well (6), first horizontal segment (7), the first perforation (8),
Bridge plug (9), the second perforation (10), the second horizontal segment (11) and injection well (17)；
Injection well (17) arrival end connects high-pressure pump (1), and outlet end is located at rock stratum (12) where discarded gas reservoir；
The recovery well (6) is bi-lateral horizontal well, and the outlet end of vertical section connects gas-liquid separation device (3), first level
Section (7) and the second horizontal segment (11) are connected with vertical section, are located at gas hydrates reservoir (15) and discarded gas reservoir
Place rock stratum (12)；Vertical section positioned at gas hydrates reservoir (15) is equipped with bridge plug (9) and the second perforation (10), bridge plug
(9) it is respectively positioned below first horizontal segment (7) with the second perforation (10), bridge plug (9) is located above the second perforation (10)；First level
Multiple first perforations (8) are evenly equipped in section (7)；
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 discarded high temperature and pressure gas reservoir exploitation gas hydrates, which is characterized in that steps are as follows:
1) seabed is chosen to contain gas hydrates while nearby there is the sea area of discarded high temperature and pressure gas reservoir as target sea
Domain, wherein discarded gas reservoir rock temperature > 150 DEG C；Using original natural gas extraction well as injection well (17)；It is hydrated in natural gas
Object reservoir (15) beats a bite bi-lateral horizontal well as recovery well (6), and a horizontal branch is located at gas hydrates reservoir
(15), another horizontal branch is connected to discarded gas reservoir (13)；In recovery well (6) close to gas hydrates reservoir (15) bottom
Vertical section be equipped with the second perforation (10), and block recovery well (6) with bridge plug (9) at the second perforation (10) 3~5m of top；It
The first horizontal segment (7) of right gas hydrate reservoir (15) is located at the top of gas hydrates reservoir (15) at following 3~5m, and right
First horizontal segment (7) carries out perforation, is formed the first perforation (8)；
2) seawater is injected into discarded gas reservoir (13) from injection well (17) with high-pressure pump (1), seawater is in discarded gas reservoir (13) after heating
The second horizontal segment 11 and the second perforation 10 under acting on the pressure difference of gas hydrates reservoir (15) through recovery well (6) reach
Gas hydrates reservoir (15), gas hydrates are thermally decomposed；First horizontal segment of the decomposition product through bi-lateral horizontal well
(7) and vertical section is recycled to sea, obtains purer natural gas after gas-liquid separation device (3), produced-water reinjection enters recovery well
(6) it is recycled.
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| CN201910167074.7A CN109882133A (en) | 2019-03-06 | 2019-03-06 | A kind of device and method using discarded high temperature and pressure gas reservoir exploitation gas hydrates |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110644963A (en) * | 2019-10-24 | 2020-01-03 | 东北石油大学 | Method for exploiting hydrate based on multilateral well |
| CN112160732A (en) * | 2020-10-24 | 2021-01-01 | 东北石油大学 | Method for mining diagenetic hydrate and gas-water separator |
| CN114016990A (en) * | 2021-11-04 | 2022-02-08 | 西安交通大学 | Direct oil extraction and waste heat utilization system of underground electrical heating of rich oil coal |
| CN115370325A (en) * | 2022-09-26 | 2022-11-22 | 中国科学院广州能源研究所 | System and method for exploiting marine natural gas hydrate resources |
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Cited By (5)
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| CN110644963A (en) * | 2019-10-24 | 2020-01-03 | 东北石油大学 | Method for exploiting hydrate based on multilateral well |
| CN112160732A (en) * | 2020-10-24 | 2021-01-01 | 东北石油大学 | Method for mining diagenetic hydrate and gas-water separator |
| CN114016990A (en) * | 2021-11-04 | 2022-02-08 | 西安交通大学 | Direct oil extraction and waste heat utilization system of underground electrical heating of rich oil coal |
| CN115370325A (en) * | 2022-09-26 | 2022-11-22 | 中国科学院广州能源研究所 | System and method for exploiting marine natural gas hydrate resources |
| CN115370325B (en) * | 2022-09-26 | 2023-06-09 | 中国科学院广州能源研究所 | System and method for exploiting marine natural gas hydrate resources |
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Application publication date: 20190614 |