CN115126449B - Method and system for cyclic heat shock exploitation of natural gas hydrate in sea area - Google Patents
Method and system for cyclic heat shock exploitation of natural gas hydrate in sea area Download PDFInfo
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- CN115126449B CN115126449B CN202110313727.5A CN202110313727A CN115126449B CN 115126449 B CN115126449 B CN 115126449B CN 202110313727 A CN202110313727 A CN 202110313727A CN 115126449 B CN115126449 B CN 115126449B
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 33
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- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 claims abstract description 90
- 238000002347 injection Methods 0.000 claims abstract description 76
- 239000007924 injection Substances 0.000 claims abstract description 76
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 239000003345 natural gas Substances 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract 2
- 238000011084 recovery Methods 0.000 claims description 26
- 238000002485 combustion reaction Methods 0.000 claims description 25
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- 239000004576 sand Substances 0.000 claims description 11
- 239000003949 liquefied natural gas Substances 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 claims description 4
- -1 natural gas hydrates Chemical class 0.000 claims description 3
- 239000008239 natural water Substances 0.000 claims description 2
- 239000013049 sediment Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000012530 fluid Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- VTVVPPOHYJJIJR-UHFFFAOYSA-N carbon dioxide;hydrate Chemical compound O.O=C=O VTVVPPOHYJJIJR-UHFFFAOYSA-N 0.000 description 3
- 150000004677 hydrates Chemical class 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses a method and a system for cyclic heat shock exploitation of natural gas hydrate in sea areas. The method mainly comprises the steps of arranging a well distribution system of a marine hydrate layer, wherein the well distribution system comprises two or more heat injection wells and a gas production well; arranging one ends of a heat injection well shaft and a gas production well shaft in a natural gas hydrate layer respectively, and drilling a heat injection well horizontal well section and a gas production well horizontal well section along the horizontal direction in the heat injection well shaft and the gas production well shaft; injecting hot water and hot flue gas into the natural gas hydrate layer through a heat injection well to decompose the hydrate in the natural gas hydrate layer into water and gas, pumping the water and the gas back to an offshore operation platform through a gas production well, liquefying, storing and transporting one part of the separated natural gas, drying and pressurizing the other part of the separated natural gas, burning the other part of the separated natural gas to provide power for the offshore operation platform, heating the water, pressurizing the obtained hot water and flue gas through a pump, reinjecting the pressurized hot water and flue gas into the natural gas hydrate layer through the heat injection well, and repeating the steps to finish the cyclic heat shock exploitation of the natural gas hydrate in the sea area. The invention is economical, safe, energy-saving and environment-friendly, and can efficiently and massively mine the natural gas hydrate in the sea area.
Description
Technical Field
The invention relates to a method and a system for cyclic heat shock exploitation of natural gas hydrate in the sea, belonging to the technical field of energy exploitation.
Background
The global industrialization is increasingly growing in energy demand and exhaustion of conventional fossil energy, and green and low-carbonization requirements for energy use, and the non-conventional natural gas energy, namely natural gas hydrate, is paid more attention to worldwide due to the advantages of huge reserves, wide distribution, high energy density, clean combustion and the like, is considered to be the most potential and promising novel efficient clean alternative energy, and is a strategic break-through of the future energy revolution [ Li Shouding, li Xiao, wang Saijing, and the like ].
Depending on the temperature-pressure conditions under which the natural gas hydrate is stable, the natural gas hydrate is mostly distributed in the territorial frozen soil area or in deep sea deposits 900 to 1200 meters from the sea surface. The current test production methods of natural gas hydrate mainly comprise: depressurization, heat shock and carbon dioxide displacement. The depressurization method is controlled by heat conduction of the natural gas hydrate reservoir, and has the advantages of low energy consumption, relatively simple exploitation technical process, suitability for large-area exploitation, and particular suitability for exploitation of natural gas hydrate in the existing underlying free gas layer. However, the simple depressurization method is obviously affected by the heat transfer of the reservoir and waterThe local large temperature drop of the compound decomposition area and the comprehensive influence of the Joule-Thomson effect can lead to secondary hydrate formation or pore water icing of gas and water in the reservoir, thereby influencing the permeability and final gas yield of the reservoir [ Ruan Xuke, li Xiaosen, xu Chungang, zhang Yu, yan Kefeng, numerical simulation of natural gas hydrate depressurization combined with borehole wall heating exploitation [ J ]]Chemical journal 2015, 66 (04): 1544-1550]. In addition, the solid natural gas hydrate is decompressed and decomposed into gaseous natural gas and liquid water, and the cementing skeleton of reservoir sediment particles is weakened, so that the strength of the hydrate reservoir is reduced, and the stratum is sanded; the gas, water and moving sediment particles decomposed by depressurization also reduce the porosity of the reservoir, and cause the permeability of the hydrate reservoir to be reduced, thereby causing the natural gas hydrate to be decomposed slowly and the gas production efficiency to be reduced. The main advantage of the heat shock method is that the gas production rate is faster. At present, the method is studied more globally, the heating mode is also being improved continuously, and the development of a heat shock exploitation method is promoted. The substitution principle of the carbon dioxide substitution method is that CO 2 Hydrate compared with CH 4 Hydrates are more prone to form hydrates. The method has the advantages of simultaneously solving the problems of natural gas hydrate exploitation and CO 2 Storage problems, the stability of the hydrate reservoir can also be maintained as much as possible during production.
So far, the average daily output of gas production simulated by a mining method under experimental design or on-site trial mining can not meet the requirements of commercial development, and the development of a more efficient, safe and environment-friendly mining technical scheme is still the key content of the development field of the current hydrate mining technology. Therefore, a technical method for economically, safely, energy-saving, environment-friendly and efficiently and massively exploiting natural gas hydrate resources in sea areas is needed to meet the commercial exploitation demands of natural gas hydrates.
Disclosure of Invention
The invention aims to provide a method and a system for cyclic heat shock exploitation of natural gas hydrate in sea areas, which are economical, safe, energy-saving, environment-friendly and efficient for exploiting natural gas hydrate in sea areas in large scale.
The invention provides a method for cyclic heat shock exploitation of natural gas hydrate in sea areas, which comprises the following steps: 1) Setting a well distribution system of a hydrate layer under the sea, wherein the well distribution system comprises two or more heat injection wells and a gas production well;
the heat injection well comprises a heat injection well shaft and a heat injection well horizontal well section which are communicated, and the gas production well comprises a gas production well shaft and a gas production well horizontal well section which are communicated; arranging one ends of the heat injection well shaft and the gas production well shaft in a natural gas hydrate layer respectively, and drilling the heat injection well horizontal well section and the gas production well horizontal well section along the horizontal direction in the heat injection well shaft and the gas production well barrel;
2) Injecting hot water and hot flue gas into the natural gas hydrate layer through the heat injection well to decompose the hydrate in the natural gas hydrate layer into water and gas;
3) Pumping water and gas generated by decomposing the natural gas hydrate layer and free water and free gas in the water and gas back to an offshore operation platform through a gas production well, and separating to obtain natural gas and water;
4) Part of the natural gas separated in the step 3) is stored and transported in a liquefied way, and the other part of the natural gas is combusted after being dried and pressurized to provide power for the offshore operation platform, and the heat generated by the combustion and the waste heat of the flue gas heat the water separated in the step 3) to obtain hot water;
5) And (3) pressurizing the hot water and the flue gas in the step (4) through a pump, reinjecting the hot water and the flue gas to the natural gas hydrate layer through the heat injection well in the step (2), and then repeating the steps (3) to 4) to finish the cyclic heat shock exploitation of the natural gas hydrate in the sea area.
In the method, the heat injection well horizontal well section is arranged at the upper part of the gas production well horizontal well section along the vertical direction of the natural gas hydrate layer.
In the invention, the heat injection well is positioned above the gas production well so as to provide proper temperature to prevent secondary hydrate around the gas production well from generating and avoid blocking a fluid channel to influence gas production; meanwhile, hot flue gas such as carbon dioxide brought by the heat injection well can form carbon dioxide hydrate at the upper part of the natural gas hydrate layer, so that the stability of the whole reservoir is improved; in addition, the heat injection well is arranged at the upper part of the gas production well, injected hot water and hot flue gas can wash away sediment possibly existing near the gas production well, so that the circulation of a reservoir near the gas production well is increased, and the decomposition of hydrate to produce gas is accelerated
In the method, the sand prevention device is arranged at the tail end of the horizontal section of the gas production well, so that sand production phenomenon and sand blocking fluid channel behavior in the gas production process are avoided;
and 3) pumping water and gas generated by decomposing the natural gas hydrate layer in the step 3) and free water and free gas in the natural gas hydrate layer back to an offshore operation platform through a gas production well after the natural gas hydrate layer is treated by the sand control device.
In the method, in the step 4), the combustion is performed in a combustion chamber of a gas turbine in the offshore operation platform, so that the turbine operation is driven to provide power for the offshore operation platform.
In the above method, the gas production well is driven by a pump.
The invention also provides a system for cyclic heat shock exploitation of the natural gas hydrate in the sea area, which comprises two or more heat injection wells, a gas production well and a device arranged in an offshore operation platform;
the heat injection well comprises a heat injection well shaft and a heat injection well horizontal well section which are communicated, and the gas production well comprises a gas production well shaft and a gas production well horizontal well section which are communicated;
the device arranged in the offshore operation platform comprises a gas-liquid separation device, a gas depressurization recovery device, a liquefied natural gas storage tank, a compressor, a steam turbine, a combustion chamber, a hot water/hot flue gas storage tank, a water circulation recovery device and a pressurizing injection device;
the gas recovery shaft is connected with the inlet of the gas-liquid separation device, the gas outlet of the gas-liquid separation device is respectively connected with the liquefied natural gas storage tank and the compressor through the gas depressurization recovery device, the liquid outlet of the gas-liquid separation device is connected with the water inlet of the water circulation recovery device, and one water outlet of the water circulation recovery device is connected with the steam turbine so as to heat circulating water through waste heat released by a combustion chamber in the steam turbine;
the compressor is connected with the combustion chamber arranged in the steam turbine, a part of natural gas is supplied to the combustion chamber for use to provide power for the offshore operation platform, and the combustion chamber is connected with the hot water/hot flue gas storage tank through a hot flue gas pipeline and a hot water pipeline so as to store and recycle heat of hot flue gas and hot water generated by the combustion chamber; the hot water/hot flue gas storage tank and the other water outlet of the water circulation recovery device are connected with the heat injection shaft through a pressurizing injection device, and hot flue gas and hot water are added into the heat injection shaft together.
In the invention, each component included in the system for circulating heat shock exploitation of the natural gas hydrate in the sea area is a device conventional in the field.
The invention has the following advantages:
1. according to the invention, natural gas extracted from a hydrate layer is utilized to meet the operation requirement of an offshore platform, water extracted from the hydrate reservoir is heated, and then the water and hot waste gas generated by natural gas combustion are reinjected into the hydrate reservoir after being pressurized by a pump, so that natural gas hydrate is extracted by circulating heat shock; the energy and the heat medium required in the exploitation process of the method can be self-sufficient, and no pollution is discharged to the environment.
2. According to the invention, the heat injection well is arranged above the production well, so that hot water and hot flue gas injected by the heat injection well above the production well provide proper heat to prevent secondary hydrates around the production well from being generated while the cyclic heat injection and pumping and extraction of natural gas hydrates are satisfied, and the influence of blocking a fluid channel on the production of gas is avoided; meanwhile, the hot flue gas injected by the heat injection well above the gas production well can produce carbon dioxide hydrate at the upper part of the hydrate reservoir, which is beneficial to improving the stability of the whole reservoir in the natural gas hydrate exploitation process; the heat injection well is arranged above the gas production well, and the heat injection well injects hot water and hot smoke with certain speed and pressure into the upper part of the gas production well, so that sand deposition possibly existing near the gas production well can be flushed, the circulation of a reservoir near the gas production well is increased, and therefore the decomposition of hydrate and gas production are accelerated.
3. The invention is economical and safe; the heated hot water and hot flue gas generated by the gas turbine are pressurized by a pump and then are reinjected into the hydrate layer through the heat injection well, so that the energy conservation and environmental protection are realized; the invention can efficiently and massively mine natural gas hydrate resources in sea areas.
Drawings
FIG. 1 is a schematic flow chart of a cyclic heat shock exploitation method of natural gas hydrate in sea area;
FIG. 2 is a schematic diagram of the system structure of the offshore cyclic heat shock exploitation of the natural gas hydrate in the sea area;
the individual labels in fig. 1-2 are as follows:
1 a natural gas hydrate underlying sediment layer; a natural gas hydrate reservoir; 3 a natural gas hydrate upper sediment layer; 4 a liquefied natural gas storage tank; 5 an offshore operation platform; 6, a steam turbine; a compressor 7; 8 a combustion chamber; 9, a gas depressurization recovery device; 10 a gas-liquid separation device; 11 a water circulation recovery device; 12 hot water/hot flue gas storage tanks; 13 a pressurizing injection device; 14 sea level; 15 gas production wells; 16 injection wells.
Detailed Description
The following describes the present invention in further detail with reference to fig. 1 and the specific technical scheme.
Example 1
Fig. 2 is a schematic structural diagram of a system for cyclic heat shock exploitation of natural gas hydrate in the sea area. The system comprises two or more injection wells 16 and two or more production wells 15, and means arranged in the offshore platform 5;
the heat injection well 16 comprises a heat injection well shaft and a heat injection well horizontal well section which are communicated, and the gas production well 15 comprises a gas production well shaft and a gas production well horizontal well section which are communicated;
the device arranged in the offshore operation platform 5 comprises a gas-liquid separation device 10, a gas depressurization recovery device 9, a liquefied natural gas storage tank 4, a compressor 7, a steam turbine 6, a combustion chamber 8, a hot water/hot flue gas storage tank 12, a water circulation recovery device 11 and a pressurization injection device 13;
the gas recovery shaft is connected with the inlet of a gas-liquid separation device 10, the gas outlet of the gas-liquid separation device 10 is respectively connected with a liquefied natural gas storage tank 4 and a compressor 6 through a gas depressurization recovery device 9, the liquid outlet of the gas-liquid separation device 10 is connected with the water inlet of a water circulation recovery device 11, and one water outlet of the water circulation recovery device 11 is connected with a steam turbine 6 so as to heat circulating water through residual heat released by a combustion chamber in the steam turbine;
the compressor 7 is connected with the combustion chamber 8 arranged in the steam turbine 6, a part of natural gas is supplied to the combustion chamber for use to provide power for the offshore operation platform, and the combustion chamber 8 is connected with the hot water/hot flue gas storage tank 12 through a hot flue gas pipeline and a hot water pipeline so as to store and recycle the heat of hot flue gas and hot water generated by the combustion chamber 8; the hot water/hot flue gas storage tank 12 and the other water outlet of the water circulation recovery device 11 are connected with the heat injection shaft through the pressurizing injection device 13, and hot flue gas and hot water are added into the heat injection shaft together.
The invention relates to a sea area natural gas hydrate circulating heat shock exploitation method, which is carried out according to a flow shown in figure 1 and comprises the following specific steps: firstly, constructing a heat injection well 16 and a gas production well 15 on a natural gas hydrate reservoir layer 2 above a natural gas hydrate underlying sediment layer 1, and drilling a horizontal well section in the heat injection well and the gas production well along the horizontal direction to make the heat injection well 16 and the gas production well 15 go deep into the natural gas hydrate reservoir layer 2 as far as possible, and increasing the contact surface between the heat injection well 16 and the gas production well and the natural gas hydrate reservoir layer 2 so as to meet the expansion production requirement; meanwhile, for the position arrangement of the heat injection well 16 and the gas production well 15, the heat injection well 16 is arranged above the gas production well 15 along the vertical direction of the natural gas hydrate reservoir 2, hot water and hot flue gas injected by the heat injection well 15 above the gas production well 15 provide proper heat to prevent secondary hydrate around the gas production well 15 from being generated while the cyclic heat injection and pumping to produce natural gas hydrate are met, and the influence of blocking fluid channels on gas production is avoided; meanwhile, the hot flue gas injected by the heat injection well 16 above the gas production well 15 can produce carbon dioxide hydrate at the upper part of the natural gas hydrate reservoir 2, so that the stability of the whole reservoir in the natural gas hydrate exploitation process can be improved; the heat injection well 16 is arranged above the gas production well 15, and the heat injection well 16 injects hot water and hot flue gas with a certain speed and pressure into the upper part of the gas production well 15 so as to wash out sediment possibly existing near the gas production well, and increase the circulation of a reservoir near the gas production well, thereby accelerating the decomposition of hydrate and gas production. And a sand prevention device is arranged at the tail end of the horizontal well of the gas production well 15, so that sand production phenomenon and sand blocking of a fluid channel in the gas production process are avoided.
The heat injection well 16 injects heat mediums such as hot water, hot flue gas and the like into the natural gas hydrate reservoir 2 to decompose natural gas hydrate, meanwhile, the gas production well 15 pumps water and gas mixed fluid generated by decomposing the natural gas hydrate and free gas and free water in the natural gas hydrate reservoir 2 through pumping operation, the natural gas and free water are pumped back to the offshore operation platform 5 after sand prevention treatment, water is purified after being separated by the gas-liquid separation device 10, the water is introduced into a hot water pipe through the water circulation recovery device 11 to be heated and pressurized, and the natural gas is recovered and dried through the gas depressurization recovery device 9 and then enters the liquefied natural gas storage tank 4 for liquefaction, storage and transportation, part of the natural gas enters the combustion chamber 8 of the gas turbine 6 to react after being dried and compressed through the compressor 7, the steam turbine 6 is pushed to work to meet the power requirement of the offshore operation platform, and circulating water for circulating heat and the like are heated by utilizing heat generated by natural gas combustion and flue gas waste heat; the heated hot water and heat mediums such as hot smoke generated by the gas turbine are stored in the hot water/hot smoke storage tank 12, pressurized by the pressurizing injection device 13 when needed, and then reinjected into the natural gas hydrate reservoir 2 through the injection well 16, so that the natural gas hydrate is continuously exploited by heat shock, and the gas production well 15 is used for gas production and water production, and further the decomposition and gas production of the natural gas hydrate are promoted, so that the cyclic heat shock exploitation is realized. Meanwhile, the heat injection well 16 is arranged above the gas production well 15, so that the natural gas hydrate resources in the sea area can be economically, safely, energy-saving, environment-friendly and efficiently exploited in a large scale.
Claims (6)
1. A method for cyclic heat shock exploitation of natural gas hydrate in sea areas comprises the following steps: 1) Setting a well distribution system of a hydrate layer under the sea, wherein the well distribution system comprises two or more heat injection wells and a gas production well;
the heat injection well comprises a heat injection well shaft and a heat injection well horizontal well section which are communicated, and the gas production well comprises a gas production well shaft and a gas production well horizontal well section which are communicated; arranging one ends of the heat injection well shaft and the gas production well shaft in a natural gas hydrate layer respectively, and drilling the heat injection well horizontal well section and the gas production well horizontal well section along the horizontal direction in the heat injection well shaft and the gas production well barrel;
2) Injecting hot water and hot flue gas into the natural gas hydrate layer through the heat injection well to decompose the hydrate in the natural gas hydrate layer into water and gas;
3) Pumping water and gas generated by decomposing the natural gas hydrate layer and free water and free gas in the water and gas back to an offshore operation platform through a gas production well, and separating to obtain natural gas and water;
4) Drying and pressurizing a part of the natural gas obtained in the step 3) and then burning to provide power for the offshore operation platform, and heating the water separated in the step 3) by heat generated by burning and waste heat of flue gas to obtain hot water;
5) And (3) pressurizing the hot water and the flue gas in the step (4) through a pump, reinjecting the hot water and the flue gas to the natural gas hydrate layer through the heat injection well in the step (2), and then repeating the steps (3) to 4) to finish the cyclic heat shock exploitation of the natural gas hydrate in the sea area.
2. The method according to claim 1, characterized in that: and the heat injection well horizontal well section is arranged at the upper part of the gas production well horizontal well section along the vertical direction of the natural gas hydrate layer.
3. The method according to claim 1 or 2, characterized in that: a sand prevention device is arranged at the tail end of the horizontal section of the gas production well;
and 3) pumping water and gas generated by decomposing the natural gas hydrate layer in the step 3) and free water and free gas in the natural gas hydrate layer back to an offshore operation platform through a gas production well after the natural gas hydrate layer is treated by the sand control device.
4. A method according to any one of claims 1-3, characterized in that: the combustion in the step 4) is carried out in a combustion chamber of a steam turbine in the offshore operation platform, so that the turbine operation is driven to provide power for the offshore operation platform.
5. The method according to any one of claims 1-4, wherein: the gas production well is driven by a pump.
6. A system for cyclic heat shock recovery of sea natural gas hydrates for use in the method of any one of claims 1 to 5, characterized by: the system comprises two or more heat injection wells, two or more gas production wells and devices arranged in an offshore operation platform;
the heat injection well comprises a heat injection well shaft and a heat injection well horizontal well section which are communicated, and the gas production well comprises a gas production well shaft and a gas production well horizontal well section which are communicated;
the device arranged in the offshore operation platform comprises a gas-liquid separation device, a gas depressurization recovery device, a liquefied natural gas storage tank, a compressor, a steam turbine, a combustion chamber, a hot water/hot flue gas storage tank, a water circulation recovery device and a pressurizing injection device;
the gas recovery shaft is connected with the inlet of the gas-liquid separation device, the gas outlet of the gas-liquid separation device is respectively connected with the liquefied natural gas storage tank and the compressor through the gas depressurization recovery device, the liquid outlet of the gas-liquid separation device is connected with the water inlet of the water circulation recovery device, and one water outlet of the water circulation recovery device is connected with the steam turbine;
the compressor is connected with the combustion chamber arranged in the steam turbine, and the combustion chamber is connected with the hot water/hot flue gas storage tank through a hot flue gas pipeline and a hot water pipeline; the hot water/hot flue gas storage tank and the other water outlet of the water circulation recovery device are connected with the heat injection shaft through a pressurizing injection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110313727.5A CN115126449B (en) | 2021-03-24 | 2021-03-24 | Method and system for cyclic heat shock exploitation of natural gas hydrate in sea area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110313727.5A CN115126449B (en) | 2021-03-24 | 2021-03-24 | Method and system for cyclic heat shock exploitation of natural gas hydrate in sea area |
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| CN115126449A CN115126449A (en) | 2022-09-30 |
| CN115126449B true CN115126449B (en) | 2023-06-20 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786416A (en) * | 2005-12-22 | 2006-06-14 | 中国石油大学(华东) | Method for extracting hydrate on bottom of sea by deep earth heart water circulation |
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| CN106837258A (en) * | 2017-03-28 | 2017-06-13 | 中国石油大学(华东) | A kind of gas hydrate exploitation device and method |
| CN207245684U (en) * | 2017-07-05 | 2018-04-17 | 大连海事大学 | Temperature activation method quarrying apparatus for exploitation of gas hydrates in marine sediment |
| US10267129B1 (en) * | 2018-05-14 | 2019-04-23 | China University Of Petroleum (East China) | Homocentric squares-shaped well structure for marine hydrate reserve recovery utilizing geothermal heat and method thereof |
| CN109736754A (en) * | 2019-03-06 | 2019-05-10 | 大连理工大学 | A kind of device and method using hot dry rock exploitation of gas hydrate |
| CN111852407A (en) * | 2020-07-17 | 2020-10-30 | 大连理工大学 | Heat shock method hydrate exploitation device based on solar absorption heat pump |
-
2021
- 2021-03-24 CN CN202110313727.5A patent/CN115126449B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786416A (en) * | 2005-12-22 | 2006-06-14 | 中国石油大学(华东) | Method for extracting hydrate on bottom of sea by deep earth heart water circulation |
| CN101016841A (en) * | 2007-02-13 | 2007-08-15 | 中国科学院广州能源研究所 | Method for exploiting natural gas hydrates and device thereof |
| CN106837258A (en) * | 2017-03-28 | 2017-06-13 | 中国石油大学(华东) | A kind of gas hydrate exploitation device and method |
| CN207245684U (en) * | 2017-07-05 | 2018-04-17 | 大连海事大学 | Temperature activation method quarrying apparatus for exploitation of gas hydrates in marine sediment |
| US10267129B1 (en) * | 2018-05-14 | 2019-04-23 | China University Of Petroleum (East China) | Homocentric squares-shaped well structure for marine hydrate reserve recovery utilizing geothermal heat and method thereof |
| CN109736754A (en) * | 2019-03-06 | 2019-05-10 | 大连理工大学 | A kind of device and method using hot dry rock exploitation of gas hydrate |
| CN111852407A (en) * | 2020-07-17 | 2020-10-30 | 大连理工大学 | Heat shock method hydrate exploitation device based on solar absorption heat pump |
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