CN113236192A - Marine hydrate underwater mining system and method - Google Patents
Marine hydrate underwater mining system and method Download PDFInfo
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- CN113236192A CN113236192A CN202110346038.4A CN202110346038A CN113236192A CN 113236192 A CN113236192 A CN 113236192A CN 202110346038 A CN202110346038 A CN 202110346038A CN 113236192 A CN113236192 A CN 113236192A
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
- E21B41/0057—Disposal of a fluid by injection into a subterranean formation
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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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/36—Underwater separating arrangements
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Abstract
本发明公开了一种海洋水合物水下开采系统和方法，开采井采出包括气态天然气、地层水和固体颗粒的混合流体，混合流体经过水下三相分离器分离出气态天然气、地层水、固体颗粒流体，其中，气态天然气输送到海面区域开发的中心处理平台，并由液化天然气运输船定期将液化天然气运输至岸基液化天然气接收站；地层水经回注井重新输送至海底地层，补充地层压力能量亏空。本发明公开的一种海洋水合物水下开采系统和方法，提高了开采效率，优化了水合物开采流程，减少海面平台功能负担，降低了单井开采成本。
The invention discloses a marine hydrate underwater mining system and method. The mining well produces a mixed fluid including gaseous natural gas, formation water and solid particles, and the mixed fluid passes through an underwater three-phase separator to separate the gaseous natural gas, formation water, Solid particle fluid, in which gaseous natural gas is transported to the central processing platform developed in the offshore area, and the LNG is regularly transported to the shore-based LNG receiving station by the LNG carrier; the formation water is re-transported to the subsea formation through the reinjection well to replenish Formation pressure energy deficit. The invention discloses a marine hydrate underwater mining system and method, which improves the mining efficiency, optimizes the hydrate mining process, reduces the functional burden of the sea surface platform, and reduces the single-well mining cost.
Description
Technical Field
The invention relates to the technical field of marine hydrate exploitation, in particular to a marine hydrate underwater exploitation system and method.
Background
The natural gas hydrate is clean energy with extremely high development value, has the characteristics of large reserves, small pollution, wide distribution and the like, is good future alternative energy, is concerned by multi-national governments and researchers in the United states, Russia, China, Japan, Germany, Canada and the like, and becomes a strategic high place of energy competition among major countries in the world. Natural gas hydrates in China are mainly distributed in south China sea Shenhu sea areas, Qiongnan sea areas, east China sand sea areas, west China sand sea areas and the like, and the reserves are rich. The development of hydrate in sea area will have great influence on the development pattern of new clean energy in China and the world.
The existing hydrate reservoir is mined by using a large platform, and the problems that the daily rental cost of the platform is high, the requirement on the applicable sea condition environmental conditions is high, the operation cost is not in direct proportion to the productivity benefit and the like exist. At present, in the process of exploiting marine hydrates, fluid produced by a wellhead is directly conveyed to a central processing platform, three-phase separation is required to be carried out on the central processing platform, tasks such as geological water environment-friendly processing, natural gas liquefaction and storage are required to be completed, and the functional burden of the central processing platform on the sea surface is greatly increased.
Disclosure of Invention
The invention aims to provide an underwater ocean hydrate mining system and method, which are used for solving the problem that the function burden of the existing offshore central processing platform is too heavy.
The invention provides an underwater ocean hydrate production system which comprises a central processing platform, at least one production well, an underwater separator, at least one reinjection well and at least one liquefied natural gas carrier, wherein the production well is arranged in a seabed and can be used for producing mixed fluid containing reservoir hydrates to a wellhead and converting the mixed fluid into gaseous natural gas and formation water; the underwater separator comprises a separation cavity, a mixed fluid input pipe, a gaseous natural gas output pipe and a formation water output pipe, wherein the separation cavity is provided with a separation cavity inlet and at least two separation cavity outlets, the at least two separation cavity outlets are respectively communicated with at least two cavities of the separation cavity, the mixed fluid input pipe is communicated with the inlet of the separation cavity, and the gaseous natural gas output pipe and the formation water output pipe are respectively communicated with two separation cavity outlets of the separation cavity; the reinjection well is arranged in a seabed, a liquid inlet of the reinjection well is in butt joint with an output port of the formation water output pipe, and the reinjection well can re-convey formation water conveyed to a wellhead by the formation water output pipe to a seabed stratum; the central processing platform comprises a natural gas liquefaction device and a liquefied natural gas temporary storage tank, a gaseous natural gas inlet and a liquid natural gas outlet are formed in the natural gas liquefaction device, the gaseous natural gas inlet is in butt joint with a gas outlet of a gaseous natural gas output pipe, the liquid natural gas outlet of the natural gas liquefaction device is connected with the liquefied natural gas temporary storage tank through a pipeline, the liquefied natural gas temporary storage tank is connected with the liquefied natural gas carrier through a liquid conveying pipeline, and the liquefied natural gas carrier finishes the storage and transportation of the liquefied natural gas.
Preferably, the device also comprises an environment-friendly discharge device, wherein the environment-friendly discharge device comprises an environment-friendly treatment cavity, a sewage treatment output pipe and a solid particle treatment output pipe, the environment-friendly treatment cavity is connected with an environment-friendly treatment cavity inlet, a sewage treatment outlet and a solid particle treatment outlet, a separation cavity is additionally arranged on the separation cavity to form a three-phase separation cavity, a separation cavity outlet and a solid particle fluid output pipe are arranged on the additionally arranged separation cavity, the three separation cavity outlets are respectively communicated with the three chambers of the three-phase separation cavity, and the gaseous natural gas output pipe, the formation water output pipe and the solid particle fluid output pipe are respectively communicated with the three separation cavity outlets of the separation cavity; the inlet of the environment-friendly treatment cavity is communicated with the outlet of the solid particle fluid output pipe, and the sewage treatment outlet is in butt joint with the liquid inlet of the reinjection well through the sewage treatment output pipe; the solid particle treatment outlet is communicated to the seabed through the solid particle treatment output pipe.
Preferably, the mixed fluid input pipe, the gaseous natural gas output pipe and the formation water output pipe are all provided with valves.
Preferably, the solid particle fluid output pipe, the sewage treatment output pipe and the solid particle treatment output pipe are all provided with valves.
Preferably, the central processing platform comprises a generator set, and the underwater separator, the production well, the reinjection well and the environment-friendly discharge device are all connected with the generator set of the central processing platform through cables.
The invention also relates to an underwater ocean hydrate mining method, which adopts the underwater ocean hydrate mining system and comprises the following steps:
step S1: the production well is used for producing reservoir hydrates, the reservoir hydrates are decomposed to form mixed fluid containing gaseous natural gas, formation water and solid particles, and the mixed fluid is conveyed to a well head;
step S2: the mixed fluid flows into the underwater separator from a wellhead of the production well through the mixed fluid input pipe, the underwater separator separates the mixed fluid into gaseous natural gas, formation water and solid particle fluid, and the gaseous natural gas, the formation water and the solid particle fluid are discharged through a gaseous natural gas output pipe, a formation water output pipe and a solid particle fluid output pipe respectively;
step S3: conveying the gaseous natural gas to a natural gas liquefying device of the central processing platform through a gaseous natural gas output pipe, and liquefying the gaseous natural gas into liquid natural gas by the natural gas liquefying device; the liquefied natural gas is conveyed from the natural gas liquefaction device to a liquefied natural gas temporary storage tank; the liquefied natural gas temporary storage tank conveys the stored liquefied natural gas to an liquefied natural gas transport ship, and the liquefied natural gas transport ship periodically conveys the liquefied natural gas to a shore-based liquefied natural gas receiving station;
the formation water is conveyed to a wellhead of the reinjection well through a formation water output pipe, and the reinjection well conveys the formation water of the wellhead to the seabed formation again;
the solid particle fluid is conveyed to the environment-friendly treatment cavity of the environment-friendly discharge device through a solid particle fluid output pipe, the solid particle fluid is subjected to environment-friendly treatment in the environment-friendly treatment cavity of the environment-friendly discharge device and then separated to form a formation water fluid meeting the formation protection water quality and a solid particle fluid meeting the safety and environment protection requirements, the formation water fluid meeting the formation protection water quality flows back to the reinjection well through a sewage treatment output pipe, and the solid particle fluid meeting the safety and environment protection requirements is discharged to the seabed through a solid particle fluid output pipe;
step S4: the groundwater that returns to the reinjection well is re-transported to the subsea formation.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses an underwater exploitation system and method of marine hydrates.A mixed fluid comprising gaseous natural gas, formation water and solid particles is extracted from an exploitation well, and the mixed fluid is separated into the gaseous natural gas, the formation water and the solid particle fluid by an underwater three-phase separator, wherein the gaseous natural gas is conveyed to a central processing platform developed in a sea surface area, and the liquefied natural gas is periodically conveyed to a shore-based liquefied natural gas receiving station by a liquefied natural gas carrier; and the formation water is re-conveyed to the seabed formation through the reinjection well to supplement formation pressure energy deficit. The invention discloses an underwater exploitation system and method of marine hydrates, which mainly aim at the massive distribution hydrate reservoirs of ocean reserves, optimize the hydrate exploitation process, reduce the function burden of a sea platform and reduce the single-well exploitation cost.
Drawings
Fig. 1 is a schematic structural view of a marine hydrate production system provided in example 1 of the present invention;
fig. 2 is a schematic structural diagram of a marine hydrate production system according to example 2 of the present invention.
Detailed Description
Example 1
Referring to fig. 1, the marine hydrate subsea production system includes a central processing platform 1, a production well 2, a subsea separator 3, a reinjection well 4, and a liquefied natural gas carrier 5.
The production well 2 is arranged in the seabed, and comprises a well completion shaft, a production pipe column, an underwater wellhead Christmas tree and the like, and adopts the production methods of depressurization, heat shock and the like to produce reservoir hydrates through the production pipe column and the underwater wellhead Christmas tree, decompose the reservoir hydrates to form mixed fluid containing gaseous natural gas, formation water and solid particles, and convey the mixed fluid to a wellhead.
The subsea separator 3 comprises a separation chamber, a mixed fluid inlet pipe 60, a gaseous natural gas outlet pipe 61 and a formation water outlet pipe 62.
The separation chamber is provided with a separation chamber inlet and two separation chamber outlets, the two separation chamber outlets are respectively communicated with two of the separation chambers, and the mixed fluid input pipe 60 is communicated with the inlet of the separation chamber.
The gaseous natural gas output pipe 61 and the formation water output pipe 62 are respectively communicated with the outlets of the two separation chambers of the separation chamber.
The mixed fluid flows from the wellhead of the production well 2 through the mixed fluid input pipe 60 to the subsea separator 3, and the subsea separator 3 separates the mixed fluid into gaseous natural gas and formation water.
Valves are provided on the mixed fluid inlet pipe 60, the gaseous natural gas outlet pipe 61 and the formation water outlet pipe 62 in order to control the start and stop of the fluid in the pipes and the flow rate thereof.
The reinjection well 4, like the recovery well 2, includes a well completion wellbore, a production string, an underwater wellhead christmas tree, etc., also disposed in the seabed. The inlet of the reinjection well 4 is in butt joint with the outlet of the formation water outlet pipe 62. The reinjection well 4 adopts the extraction methods of depressurization, heat shock and the like, and the formation water which is conveyed to the wellhead by the formation water output pipe 62 is conveyed to the seabed formation again through the production pipe column and the subsea wellhead Christmas tree.
The central processing platform 1 is the prior art and comprises a generator set, a natural gas liquefaction device and a liquefied natural gas temporary storage tank.
Wherein, the natural gas liquefaction device is provided with a gaseous natural gas inlet and a liquefied natural gas outlet, the gaseous natural gas inlet is butted with the gas outlet of the gaseous natural gas output pipe 61, receives the gaseous natural gas input from the gaseous natural gas output pipe 61, and liquefies the gaseous natural gas into liquid; the liquefied natural gas temporary storage tank is connected with a liquid natural gas outlet of the natural gas liquefying device through a pipeline, and liquefied natural gas is conveyed to the liquefied natural gas temporary storage tank from the natural gas liquefying device. The liquefied natural gas temporary storage tank of the central processing platform 1 is connected with the liquefied natural gas carrier 5 through a liquid conveying pipeline 71, the liquefied natural gas temporary storage tank conveys the stored liquefied natural gas to the liquefied natural gas carrier 5, and the liquefied natural gas is periodically conveyed to a shore-based liquefied natural gas receiving station by the liquefied natural gas carrier 5.
The underwater separator 3, the production well 2, the reinjection well 4 and other underwater equipment are all connected with a generator set of the central processing platform 1 through cables, and the generator set supplies power to the underwater separator 3, the production well 2, the reinjection well 4 and other underwater equipment.
Example 2
Referring to fig. 2, in order to treat solid particulate fluid produced from a production well 2, embodiment 2 is supplemented with an environmentally friendly discharge device 8, based on the marine hydrate subsea production system provided in embodiment 1.
The environmental-friendly discharge device 8 comprises an environmental-friendly treatment cavity, a sewage treatment output pipe 64 and a solid particle treatment output pipe 65, wherein the environmental-friendly treatment cavity is connected with an environmental-friendly treatment cavity inlet, a sewage treatment outlet and a solid particle treatment outlet.
The separation chamber of the underwater separator 3 in embodiment 1 is additionally provided with a separation chamber to form a three-phase separation chamber, and the additionally provided separation chamber is provided with a separation chamber outlet and a solid particle fluid outlet pipe 63, the three separation chamber outlets are respectively communicated with three chambers of the three-phase separation chamber, and the gaseous natural gas outlet pipe 61, the formation water outlet pipe 62 and the solid particle fluid outlet pipe 63 are respectively communicated with three separation chamber outlets of the separation chamber.
The inlet of the environment-friendly treatment cavity is communicated with the outlet of a solid particle fluid output pipe 63, and the sewage treatment outlet is in butt joint with the liquid inlet of the reinjection well 4 through a sewage treatment output pipe 64; the solids processing outlet is connected to the seafloor through a solids processing outlet pipe 65.
The main function of the environment-friendly discharge device 8 is to perform environment-friendly purification on the sand produced by the hydrate production well which may produce sand or seriously produce sand, and prevent the seawater pollution caused by the direct discharge of the produced sand and the abrasion of the sand producing particles to subsequent pipeline equipment. The environmental protection discharging device 8 is mainly added with reagent liquid such as surfactant, alkaline agent and the like, residual oil, gas and heavy metal which possibly affect the seawater ecological environment and the like attached to the surface of the sand particles are stripped off by stirring and water flow washing, the generated dirt-containing substances enter the reinjection well through the sewage treatment output pipe 64, and the sand particles which are detected to meet the environmental protection requirement are directly discharged into the seawater through the solid particle treatment output pipe 65.
The functions to be performed by the subsea separator 3 are: the mixed fluid flowing into the underwater separator 3 through the mixed fluid input pipe 60 is separated into gaseous natural gas, formation water and solid particulate fluid, and then is separately delivered through the gaseous natural gas output pipe 61, the formation water output pipe 62 and the solid particulate fluid output pipe 63.
The solid particle fluid output by the underwater separator 3 through the solid particle fluid output pipe 63 contains sewage and solid particles, the sewage and the solid particles flow through the environment-friendly treatment cavity of the environment-friendly discharge device 8, the sewage and the solid particles are separated after being treated by environment-friendly measures such as dosing, filtering, monitoring and the like in the environment-friendly treatment cavity of the environment-friendly discharge device 8 to form underground water and solid particles, the underground water and the solid particles respectively flow into the sewage treatment output pipe 64 and the solid particle treatment output pipe 65, wherein the sewage after the well environment-friendly treatment becomes the formation water fluid which meets the formation protection water quality, the formation water fluid flows back to the reinjection well 4 through the sewage treatment output pipe 64, and the solid particles after the environment-friendly treatment become the solid particle fluid which meets the safety and environment-friendly requirements, and are discharged to the seabed through the solid particle fluid output pipe 63.
In order to control the start and stop of the fluid in the pipeline and the flow rate thereof, valves are provided on the solid particle fluid output pipe 63, the sewage treatment output pipe 64 and the solid particle treatment output pipe 65.
The environment-friendly discharging device 8 is connected with a generator set of the central processing platform 1 through a cable, and the generator set supplies power for the environment-friendly discharging device 8.
Further, the central processing platform 1 has a power generation module capable of using natural gas and solar energy to supply power for the generator set, and the central processing platform 1 transmits power and control signals to underwater equipment such as the underwater separator 3, the production well 2, the reinjection well 4 and the environment-friendly discharge device 8 through an underwater cable as shown by dotted lines in fig. 1 and 2, so as to provide power supply and safety monitoring control for the underwater equipment.
Example 3
step S1: the production well 2 is used for producing reservoir hydrates, decomposing the reservoir hydrates to form mixed fluid containing gaseous natural gas, formation water and solid particles, and conveying the mixed fluid to a well head;
step S2: the mixed fluid flows into the underwater separator 3 from the wellhead of the production well 2 through the mixed fluid input pipe 60, the underwater separator 3 separates the mixed fluid into gaseous natural gas, formation water and solid particle fluid, and the gaseous natural gas, the formation water and the solid particle fluid are respectively discharged through a gaseous natural gas output pipe 61, a formation water output pipe 62 and a solid particle fluid output pipe 63;
step S3: the gaseous natural gas is conveyed to the natural gas liquefaction device of the central processing platform 1 through the gaseous natural gas output pipe 61, and the natural gas liquefaction device liquefies the gaseous natural gas into liquid natural gas; the liquefied natural gas is conveyed from the natural gas liquefaction device to a liquefied natural gas temporary storage tank; the temporary liquefied natural gas storage tank conveys the stored liquefied natural gas to an liquefied natural gas transport ship 5, and the liquefied natural gas transport ship 5 periodically conveys the liquefied natural gas to a shore-based liquefied natural gas receiving station;
the formation water is conveyed to the wellhead of the reinjection well 4 through a formation water output pipe 62, and the reinjection well 4 conveys the formation water at the wellhead to the seabed formation again so as to supplement the shortage of formation pressure energy;
the solid particle fluid is conveyed to the environment-friendly treatment cavity of the environment-friendly discharge device 8 through a solid particle fluid output pipe 63, the solid particle fluid is subjected to environment-friendly treatment in the environment-friendly treatment cavity of the environment-friendly discharge device 8 and then separated to form a formation water fluid meeting the formation protection water quality and a solid particle fluid meeting the safety and environment protection requirements, the formation water fluid meeting the formation protection water quality flows back to the reinjection well 4 through a sewage treatment output pipe 64, and the solid particle fluid meeting the safety and environment protection requirements is discharged to the seabed through a solid particle fluid output pipe 63;
step S4: the groundwater that is returned to the reinjection well 4 is re-conveyed to the subsea formation.
The technical effects are as follows: the underwater three-phase separation 3 optimizes the hydrate exploitation process, reduces the function burden of a sea platform and reduces the exploitation cost of a single well; the central processing platform 1 can control a plurality of production wells 2 and reinjection wells 4, thereby being beneficial to the integral development of large-block hydrate reservoirs, improving the utilization efficiency of the platform and increasing the integral benefit; the produced formation water is directly reinjected into the formation, so that the production treatment process is optimized, the formation pressure and energy depletion are timely supplemented, and the single-well production efficiency is improved.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. An underwater production system for marine hydrates, characterized by comprising a central processing platform (1), at least one production well (2), an underwater separator (3), at least one reinjection well (4) and at least one liquefied natural gas carrier (5),
the production well (2) is arranged in the seabed and can produce the mixed fluid containing reservoir hydrates to a wellhead and convert the mixed fluid into gaseous natural gas and formation water;
the underwater separator (3) comprises a separation cavity, a mixed fluid input pipe (60), a gaseous natural gas output pipe (61) and a formation water output pipe (62), wherein the separation cavity is provided with a separation cavity inlet and at least two separation cavity outlets which are respectively communicated with at least two cavities of the separation cavity, the mixed fluid input pipe (60) is communicated with the inlet of the separation cavity, and the gaseous natural gas output pipe (61) and the formation water output pipe (62) are respectively communicated with two separation cavity outlets of the separation cavity;
the reinjection well (4) is arranged in a seabed, a liquid inlet of the reinjection well (4) is in butt joint with an output port of the formation water output pipe (62), and the reinjection well (4) can re-convey formation water conveyed to a wellhead by the formation water output pipe (62) to a seabed stratum;
the central processing platform (1) comprises a natural gas liquefaction device and a liquefied natural gas temporary storage tank, a gaseous natural gas inlet and a liquid natural gas outlet are formed in the natural gas liquefaction device, the gaseous natural gas inlet is in butt joint with a gas outlet of a gaseous natural gas output pipe (61), the liquid natural gas outlet of the natural gas liquefaction device is connected with the liquefied natural gas temporary storage tank through a pipeline, the liquefied natural gas temporary storage tank is connected with a liquefied natural gas carrier (5) through a liquid conveying pipeline (71), and the liquefied natural gas carrier (5) completes storage and transportation of liquefied natural gas.
2. Marine hydrate subsea production system according to claim 1, characterised in that it further comprises an environmentally friendly discharge device (8),
the environment-friendly discharge device (8) comprises an environment-friendly treatment cavity, a sewage treatment output pipe (64) and a solid particle treatment output pipe (65), the environment-friendly treatment cavity is connected with an environment-friendly treatment cavity inlet, a sewage treatment outlet and a solid particle treatment outlet,
the separation cavity is additionally provided with a separation cavity to form a three-phase separation cavity, an outlet of the separation cavity and a solid particle fluid output pipe (63) are arranged on the additionally provided separation cavity, the three outlets of the separation cavity are respectively communicated with the three chambers of the three-phase separation cavity, and the gaseous natural gas output pipe (61), the formation water output pipe (62) and the solid particle fluid output pipe (63) are respectively communicated with the three outlets of the separation cavity;
the inlet of the environment-friendly treatment cavity is communicated with the outlet of the solid particle fluid output pipe (63), and the sewage treatment outlet is in butt joint with the liquid inlet of the reinjection well (4) through the sewage treatment output pipe (64); the solids processing outlet is connected to the seabed through the solids processing outlet pipe (65).
3. The subsea marine hydrate production system of claim 1,
the mixed fluid input pipe (60), the gaseous natural gas output pipe (61) and the formation water output pipe (62) are all provided with valves.
4. The subsea marine hydrate production system of claim 2,
the solid particle fluid output pipe (63), the sewage treatment output pipe (64) and the solid particle treatment output pipe (65) are all provided with valves.
5. The subsea marine hydrate production system of claim 2,
the central processing platform (1) comprises a generator set, and the underwater separator (3), the production well (2), the reinjection well (4) and the environment-friendly discharge device (8) are connected with the generator set of the central processing platform (1) through cables.
6. A marine hydrate underwater mining method using the marine hydrate underwater mining system as claimed in claim 2, 4 or 5, comprising the steps of:
step S1: the production well (2) is used for producing reservoir hydrates, decomposing the reservoir hydrates to form mixed fluid containing gaseous natural gas, formation water and solid particles, and conveying the mixed fluid to a well head;
step S2: the mixed fluid flows into the underwater separator (3) from the wellhead of the production well (2) through the mixed fluid input pipe (60), the underwater separator (3) separates the mixed fluid into gaseous natural gas, formation water and solid particle fluid, and the gaseous natural gas, the formation water and the solid particle fluid respectively exit through a gaseous natural gas output pipe (61), a formation water output pipe (62) and a solid particle fluid output pipe (63);
step S3: the gaseous natural gas is conveyed to a natural gas liquefaction device of the central processing platform (1) through a gaseous natural gas output pipe (61), and the natural gas liquefaction device liquefies the gaseous natural gas into liquid natural gas; the liquefied natural gas is conveyed from the natural gas liquefaction device to a liquefied natural gas temporary storage tank; the liquefied natural gas temporary storage tank conveys the stored liquefied natural gas to a liquefied natural gas transport ship (5), and the liquefied natural gas transport ship (5) periodically transports the liquefied natural gas to a shore-based liquefied natural gas receiving station;
the formation water is conveyed to the wellhead of the reinjection well (4) through a formation water output pipe (62), and the reinjection well (4) conveys the formation water of the wellhead to the seabed formation again;
the solid particle fluid is conveyed to an environment-friendly treatment cavity of the environment-friendly discharge device (8) through a solid particle fluid output pipe (63), the solid particle fluid is subjected to environment-friendly treatment in the environment-friendly treatment cavity of the environment-friendly discharge device (8) and then separated to form a formation water fluid meeting the formation protection water quality and a solid particle fluid meeting the safety and environment protection requirements, the formation water fluid meeting the formation protection water quality flows back to a reinjection well (4) through a sewage treatment output pipe (64), and the solid particle fluid meeting the safety and environment protection requirements is discharged to the seabed through the solid particle fluid output pipe (63);
step S4: the groundwater returning to the reinjection well (4) is re-conveyed to the subsea formation.
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| CN114320239A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Marine hydrate exploitation and reinjection system and method |
| CN114718520A (en) * | 2022-03-18 | 2022-07-08 | 中国石油大学(华东) | Method and device for drilling and producing marine natural gas hydrate |
| WO2025011195A1 (en) * | 2024-05-09 | 2025-01-16 | 中国科学院广州能源研究所 | Natural gas hydrate seabed in-situ mining method |
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| CN114320239A (en) * | 2021-12-30 | 2022-04-12 | 中国石油大学(北京) | Marine hydrate exploitation and reinjection system and method |
| CN114718520A (en) * | 2022-03-18 | 2022-07-08 | 中国石油大学(华东) | Method and device for drilling and producing marine natural gas hydrate |
| CN114718520B (en) * | 2022-03-18 | 2024-03-29 | 中国石油大学(华东) | A method and device for drilling and producing marine natural gas hydrates |
| WO2025011195A1 (en) * | 2024-05-09 | 2025-01-16 | 中国科学院广州能源研究所 | Natural gas hydrate seabed in-situ mining method |
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Application publication date: 20210810 |