CN110644952B - In-situ planting and collecting system and method for sea natural gas hydrate - Google Patents
In-situ planting and collecting system and method for sea natural gas hydrate Download PDFInfo
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- CN110644952B CN110644952B CN201910794443.5A CN201910794443A CN110644952B CN 110644952 B CN110644952 B CN 110644952B CN 201910794443 A CN201910794443 A CN 201910794443A CN 110644952 B CN110644952 B CN 110644952B
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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Abstract
The invention relates to a sea area natural gas hydrate in-situ planting and collecting system and a method thereof, and provides a system and a method for reaming a hole in an in-situ well, intercepting and planting natural gas hydrate to implement subsequent collection. The method is used for accelerating the collection speed and efficiency of plume gas in a leakage area, and sealing and transferring are formed on the premise of in-situ formation of solid hydrate, so that low energy consumption and pollution-free development of natural gas hydrate sea area collection operation are realized, the anoxic and acidification degrees of seawater are improved, and the greenhouse gas emission effect is relieved. Comprises a cold spring reaming and finished product collecting unit, a cold spring gas-collecting planting unit and a submarine engineering auxiliary unit. The cold spring reaming and finished product collecting unit comprises an engineering ship or a drilling platform, a drilling device and a hoisting system; the cold spring gas collection planting unit comprises a solid gas collecting device and a reaming and flow guiding system; a submarine engineering auxiliary unit comprises an engineering crawler connected with an engineering ship or a drilling platform through a crawler umbilical cable.
Description
Technical Field
The invention relates to an in-situ planting and collecting system and method for a sea area shallow surface layer natural gas hydrate (shown as a seabed cold spring or fluid leakage) under natural conditions, and belongs to the technical field of ocean resource development engineering.
Background
Natural gas hydrate is used as a novel, efficient and environment-friendly energy source and is widely distributed in the world, and the conservative estimation of the total amount of the hydrate of the global resource level is about n × 1015m3(hundreds of millions of cubic meters), the most promising petroleum days in the future seen by various countriesThe natural gas replaces energy.
Natural gas hydrates are crystalline compounds produced naturally and composed of hydrocarbon gases mainly including methane and water molecules, usually in the form of ice and snow, chemically belonging to "clathrate inclusions", and usually generated and existing in a low-temperature (0-10 ℃) and high-pressure (greater than 10.1MPa) environment. The content of methane in the natural gas hydrate is 80-99.9%, the natural gas hydrate is an efficient and clean energy resource, the energy density of the natural gas hydrate is 10 times that of coal or carbonaceous shale and 2 times that of conventional natural gas, and the combustion pollution of the natural gas hydrate is much less than that of traditional fossil fuels such as coal, petroleum and natural gas.
Extensive research studies have demonstrated that 99% of the total natural gas hydrates are present in the ocean and that the natural gas hydrates are shallower in depth than conventional reservoirs, primarily in surface deposits on landscapes, islands and basins. The hydrate is a metastable compound, and can still form after being discharged into a water body due to leakage of a cold spring as long as the water depth is enough, so that the phenomenon that the hydrate forms in an investigation container after methane bubbles overflow is found in cold spring investigation of many places in the world, and hydrate shells are rapidly formed on the surface of the methane bubbles after the methane bubbles overflow. Because the density of the hydrate is less than that of water, the formed hydrate crystals quickly float to the upper water body until the upper part of the stable zone is decomposed and melted. Therefore, based on the natural law, how to utilize the natural gas hydrate leakage phenomenon (namely seabed cold spring activity) to finally obtain clean methane gas from the seabed can overcome the problems of higher economic cost and greater environmental pollution of the existing drilling development, and simultaneously realize interception of the leaked methane gas from the source, solve the problems of seawater acidification and oxygen deficiency and increased greenhouse effect gas emission in the atmosphere caused by the leakage of the natural gas hydrate, and is an important technical problem in the current exploitation and collection of the natural gas hydrate in the sea area.
As described in the following prior application patent, application No. cn201710228147.x, entitled deep sea hydrothermal metal sulfide deposit in situ planting system. The in-situ planting system provided by the application utilizes natural factors to cultivate the deep-sea hydrothermal metal sulfide deposit so as to reduce the exploitation cost and avoid polluting the environment. The hydrothermal solution metal sulfide hill body is penetrated into the drilling casing, the hydrothermal solution metal sulfide hill body sequentially comprises a water-resisting layer, a hydrothermal solution fluid enrichment layer and a hill body bedrock from outside to inside, the wall of the drilling casing at the hydrothermal solution fluid enrichment layer is provided with a perforation hole, the top end of the drilling casing is provided with the wellhead control diversion device, the bottom end of the fluid mixing control cover is provided with a lower opening, the lower opening is sleeved around the top end of the drilling casing, the top end of the fluid mixing control cover is provided with an upper opening, the side wall of the fluid mixing control cover is provided with a plurality of fluid holes, and the inner wall of the fluid mixing control cover is provided with a sulfide mineral coating.
Also as in the following prior application, application No. 201710228024.6, entitled deep sea hydrothermal metal sulfide harvesting electrolysis system. This application is with reducing the exploitation, smelt and cost of transportation as the purpose, including the collection ore robot, mining platform, metal sulphide electrolytic bath and thermoelectric generator, arrange a plurality of collection ore robot on the metal sulphide deposit, the collection ore robot is through ore transfer passage connection mining platform, mining platform is through mining backward flow water discharge tube coupling ocean, set up metal sulphide electrolytic bath on the mining platform, metal sulphide electrolytic bath is through electrolysis waste water discharge tube coupling ocean, thermoelectric generator's hot junction is placed in the hydrothermal spout department of metal sulphide deposit, thermoelectric generator's cold junction is placed in bottom sea water, thermoelectric generator is through cable junction metal sulphide electrolytic bath.
The 2 references mentioned above collectively embody the technology of in-situ planting and collecting metal sulfides in deep sea areas, in liquid or solid forms, and disclose that hydrothermal metal minerals are stable substances in the collection process of hydrothermal metal minerals, and do not involve the metastable state phenomena of gas-liquid mixing and solid-state transformation, which are peculiar to natural gas hydrates, so that no technical solutions are provided for forming solid hydrates, transferring and storing, and reducing methane gas escape, and such problems are exactly the problems that the collection process of sea natural gas hydrates must face and overcome.
In view of this, the present patent application is specifically proposed.
Disclosure of Invention
The invention relates to a sea area natural gas hydrate in-situ planting and collecting system and a method thereof, and provides a system and a method thereof for reaming a hole in an in-situ well, intercepting and planting natural gas hydrate to implement subsequent collection aiming at the current cold spring leakage all over the sea floor. The method aims to accelerate the improvement of the collection speed and efficiency of plume gas in a leakage area, and the sealing and transfer are formed on the premise of in-situ formation of solid hydrate, so that the purposes of low energy consumption and pollution-free development of natural gas hydrate sea area collection operation, improvement of seawater anoxia and acidification degree and alleviation of greenhouse gas emission effect are realized.
In order to achieve the design purpose, the in-situ planting and collecting system for the sea area natural gas hydrate mainly comprises a cold spring reaming and finished product collecting unit, a cold spring gas collection planting unit and a seabed engineering auxiliary unit. Wherein the content of the first and second substances,
the cold spring reaming and finished product collecting unit comprises an engineering ship or a drilling platform, a drilling device and a hoisting system;
the cold spring gas collection planting unit comprises a solid gas collecting device and a reaming and flow guiding system; the solid gas collecting device comprises a pressure reduction gas transmission valve, a pressure sensor, an intelligent control unit and an automatic sealing device; the reaming diversion system comprises a casing, and a perforation and a wellhead flow control device which are arranged on the wall of the casing;
the auxiliary unit for the submarine engineering comprises an engineering crawler connected with an engineering ship or a drilling platform through a crawler umbilical cable, and a crawler repeater is connected to the crawler umbilical cable.
According to the design concept, after the cold spring reaming unit and the finished product collecting unit reach a free gas layer through drilling, the free gas is enabled to be discharged to play a role in reducing pressure, further leakage of the block-shaped hydrate serving as a cover layer at the upper part is promoted, and the discharge flux of methane gas at the leakage point of the hydrate is increased;
the cold spring gas collection planting unit is responsible for properly guiding escaped gas into the collection planting unit, quickly forming solid hydrate crystals in situ by utilizing the characteristic of a hydrate stability zone existing in natural gas, and performing proper pressure maintaining and self-closing operation after the whole collection unit is filled with hydrate solids.
The submarine engineering auxiliary unit mainly uses a crawler to accurately distribute, collect and the like the collecting and planting units, and finally realizes pollution-free development of sea area natural gas hydrate.
Therefore, the in-situ planting and collecting system for the sea natural gas hydrate realizes acceleration and collection of plume gas of a hydrate leakage area, forms solid hydrate in situ, then carries out sealing, naturally gasifies in the process of upward self-floating after underwater release, and transfers and seals in a sea engineering ship or an engineering platform, thereby realizing low energy consumption and pollution-free development of the natural gas hydrate. By applying the device, the escape of methane gas can be effectively reduced, the anoxic and acidification degrees of seawater are improved, and the greenhouse gas effect in the atmosphere is favorably relieved; meanwhile, the traditional drilling development of natural gas hydrate resources is changed into intensive control planting, so that the interference of silt is removed, the high-quality natural gas hydrate is obtained, and meanwhile, the shape of the obtained ore body can be uniformly controlled, so that the ore body is more suitable for the flow industrial operation in the later gas production process of liquefying and separating methane, the production efficiency is improved, and because only water bodies are discharged from an engineering ship or a platform in the production process, the environmental pollution hardly exists.
Furthermore, the solid gas collecting device is provided with an anchoring weight block connected with an anchor rope, and the anchor rope is connected with a releaser. When the buoyancy of the hydrate in the device reaches the upper limit, under the indication of the pressure sensor and the intelligent control unit, the device is integrally and automatically unhooked from the seabed and self-floats to the sea surface by utilizing the characteristic that the total density is less than that of the sea water, so as to be beneficial to collection by an engineering platform or an engineering ship.
In addition, the solid gas acquisition device is provided with a Beidou (or iridium) positioning device and a hoisting ring so as to avoid losing or entering dangerous positions of an engineering ship or a drilling platform in the ascending process.
Based on the in-situ planting and collecting system applying the sea natural gas hydrate, the application simultaneously provides a new hydrate in-situ planting and collecting method, which comprises the operation implementation process of a cold spring reaming and finished product collecting unit and a cold spring gas collection planting unit. In particular, the amount of the solvent to be used,
the operation process of the cold spring reaming and finished product collecting unit is as follows:
firstly, drilling and reaming a cold spring leakage center by using an engineering ship or a drilling platform and a drilling device;
then, a reaming diversion system is arranged and supported, and a sleeve with a perforation is arranged, so that fluid enters the sleeve along with the pressure difference between the inside and the outside;
the operation implementation process of the cold spring gas-collecting planting unit is as follows,
firstly, throwing an engineering crawler from an engineering ship or a drilling platform;
then, an anchoring weight is put in;
then, arranging a solid gas collecting device;
in the whole collection process, the buoyancy of the solid-gas collection device is sensed by the pressure sensor and the intelligent control unit, and when the preset threshold value is reached, the solid-gas collection device is separated from the anchoring weight block and floats to the sea surface to rise under the driving of the buoyancy difference;
finally, when the solid gas collecting device reaches the sea level, the solid gas is collected by the hoisting system through the hoisting ring; after the solid hydrate is completely decomposed, outputting methane gas by using a pressure reduction gas transmission valve;
and finishing a solid gas collecting device of a construction process, and continuously repeating the next construction process.
Furthermore, in the operation process of the cold spring reaming and finished product collecting unit, in order to obtain better natural gas hydrate and improve the operation efficiency of collecting the hydrate, a wellhead flow control device can be arranged at the submarine wellhead; during production, the engineering crawler is used to close and open the wellhead flow control device.
In the operation process of the cold spring reaming and finished product collecting unit, the engineering crawler is connected with an engineering ship or a drilling platform through a crawler umbilical cable and is provided with a crawler repeater so as to improve the moving flexibility and the controlled performance of the engineering crawler.
On this basis, utilize engineering crawl car to put in anchoring pouring weight and arrange it properly around reaming water conservancy diversion system to and, utilize engineering crawl car to be connected solid for the gas collection system anchor rope and anchoring pouring weight.
When the internal pressure of the solid gas collecting device is monitored to reach a preset threshold value, the automatic sealing device closes the solid gas collecting device in an air tightness processing mode; the pressure sensor and the intelligent control unit give an instruction to the releaser to release the solid gas acquisition device.
In summary, the sea area natural gas hydrate in-situ planting and collecting system and the sea area natural gas hydrate in-situ planting and collecting method have the advantages and beneficial effects that plume gas of a hydrate leakage area is accelerated and collected, solid hydrate is formed in situ, then sealing is carried out, after underwater release, natural gasification is carried out in the upward self-floating process, and transfer sealing is carried out on a sea surface engineering ship or an engineering platform, so that low-energy consumption and pollution-free development of the natural gas hydrate are realized. By applying the device, the escape of methane gas can be effectively reduced, the anoxic and acidification degrees of seawater are improved, and the greenhouse gas effect in the atmosphere is favorably relieved; meanwhile, the traditional drilling development of natural gas hydrate resources is changed into intensive control planting, so that the interference of silt is removed, the high-quality natural gas hydrate is obtained, and meanwhile, the shape of the obtained ore body can be uniformly controlled, so that the ore body is more suitable for the flow industrial operation in the later gas production process of liquefying and separating methane, the production efficiency is improved, and because only water bodies are discharged from an engineering ship or a platform in the production process, the environmental pollution hardly exists.
Drawings
The drawings are included to further detail the design concepts and features of the application.
Fig. 1 is a schematic diagram of an in-situ planting and collecting system for sea natural gas hydrates.
In the figure, 1, an engineering ship or a drilling platform, 11, a drilling device, 12 and a hoisting system; 2. the device comprises a solid gas acquisition device, a pressure reduction gas transmission valve 21, a Beidou (or iridium) positioning device, a lifting ring 23, a lifting ring 24, a formed solid hydrate 25, a pressure sensor and intelligent control unit 26, a releaser 27, an anchoring weight 28, an anchor cable 29 and an automatic sealing device; 3. engineering creeper truck, 31-creeper truck umbilical cable, 32, creeper truck repeater; 4. a reaming diversion system 41, a casing 42, a perforation 43 and an wellhead flow control device; 5. mud volcanoes developing cold springs and shallow hydrate layers, 51, overburden layer, 52, solid hydrate layer, 53, free gas layer under hydrate layer, 54, lower sediment layer or bedrock, 55, primary fracture zone (fluid rapid leakage zone).
Detailed Description
The present application is further described with reference to the accompanying drawings and the following preferred embodiments.
Example 1, as shown in fig. 1, the present application is directed to a hydrate driven cold spring that, when determining the presence of a good hydrate resource and significant cold spring leakage paths in the hydrate area, first collects the cold spring fluid at the seafloor, then plants it in situ, and finally collects it.
The in-situ planting and collecting system for the sea area natural gas hydrate comprises a cold spring reaming and finished product collecting unit, a cold spring gas collection planting unit and a seabed engineering auxiliary unit. Wherein the content of the first and second substances,
the cold spring reaming and finished product collecting unit comprises an engineering ship or a drilling platform 1, a drilling device 11 and a hoisting system 12;
the cold spring gas collection planting unit comprises a solid gas collection device 2 and a reaming and flow guiding system 4;
the solid gas collecting device 2 comprises a pressure reduction gas transmission valve 21 arranged at the top of the device, a pressure sensor and an intelligent control unit 25 on the tube wall of the device, and an automatic sealing device 29 at the bottle opening position of the device; an anchoring weight 27 connected with an anchor cable 28 is arranged at the bottom of the device, and a releaser 26 is connected on the anchor cable 28; the top of the device is provided with a Beidou (or iridium) positioning device 22 and a hoisting ring 23;
the reaming and flow guiding system 4 comprises a casing 41, a perforation 42 arranged on the pipe wall of the casing 41 and a wellhead flow control device 43 of a nozzle device;
the auxiliary unit for the seabed engineering comprises an engineering crawler 3 which is connected with an engineering ship or a drilling platform 1 through a crawler umbilical cable 31, and a crawler repeater 32 is connected at the crawler umbilical cable 31.
The method for planting and collecting the sea natural gas hydrate in situ comprises the operation implementation processes of a cold spring reaming and finished product collecting unit and a cold spring gas collection planting unit.
The operation implementation process of the cold spring reaming and finished product collecting unit is as follows:
firstly, after detecting a developing cold spring with a certain cold spring flux and a mud volcano 5 of a hydrate layer on a shallow surface layer, using an engineering ship or a drilling platform 1 with the drilling construction capacity, and drilling a well in a cold spring leakage center (a fault or a position with an obvious channel) by using a drilling device 11 and reaming the well;
then, a reaming diversion system 4 is arranged and supported, a casing 41 with a perforation 42 is arranged, so that fluid enters the casing 41 along with the difference of internal pressure and external pressure, and a wellhead flow control device 43 is arranged at the seabed wellhead; in the production process, the engineering crawler 3 can be used for closing and opening the wellhead flow control device 43 at any time so as to control the flow and avoid the direct leakage of fluid into seawater caused by the replacement of the solid gas collecting device 2;
when drilling, selecting a main fault zone (fluid rapid leakage zone) 55 as a drilling target point; longitudinally, first through the overlying sedimentary layer 51 and then through the solid hydrate layer 52 of the cold spring zone, up to 53 the free gas layer below the hydrate layer; in addition, the coverage of the perforation is ensured to also comprise a hydrate layer and a free gas layer, so that the gas output is enlarged, and the production capacity is increased.
The operation implementation process of the cold spring gas collection planting unit is as follows:
firstly, after the reaming and diversion construction is completed, the engineering crawler 3 is thrown from the engineering ship or the drilling platform 1, the engineering crawler 3 is connected with the engineering ship or the drilling platform 1 through a crawler umbilical cable 31, and a crawler repeater 32 is arranged, so that the moving range of the engineering crawler 3 on the seabed is enlarged.
Then, an anchoring weight 27 is put in and properly arranged around the reaming and flow guiding system 4 by using the engineering crawler 3; and then, the solid gas collecting device 2 is arranged, and the engineering crawler 3 is used for connecting the solid gas collecting device with the anchoring weight 27 through the anchor cable 28, so that the arrangement of the gas collecting device is completed. At this time, the cold spring fluid in the lower diversion hole enters the solid gas collection device 2.
Because of the inside of the hydrate stability zone, solid hydrate is gradually formed at the top of the solid gas collecting device 2, as shown by the formed solid hydrate 24; the density of the solid hydrate is less than that of the seawater, and the formed hydrate continuously removes the seawater, so that the buoyancy borne by the whole device is increased, and the buoyancy is sensed by the pressure sensor and the intelligent control unit 25; when a preset threshold value is reached, namely after the whole collecting device is completely filled with the solid hydrate, the obtained buoyancy is maximum, and at the moment, the pressure sensor and intelligent control unit 25 controls the automatic closing device 29 to be automatically closed; the automatic closing device 29 can adopt an air-tight processing mode, so that the inside of the whole solid gas collecting device 2 is completely and hermetically isolated from the external environment; at this time, the pressure sensor and intelligent control unit 25 gives an instruction to the releaser 26 to integrally separate the solid gas collecting device 2 from the anchoring weight 27, and then floats to rise to the sea surface under the driving of the buoyancy difference;
in the process, the solid hydrate in the solid-gas collecting device 2 is continuously decomposed and gradually becomes a gas (methane) and water mixture when reaching the sea surface; meanwhile, the solid gas acquisition device 2 is provided with a Beidou (or iridium) positioning device 22 so as to prevent the solid gas acquisition device from losing or entering dangerous positions (such as the propeller position of an engineering ship and the like) of the engineering ship or the drilling platform 1 in the ascending process; meanwhile, the hoisting ring 23 is arranged on the solid gas collecting device 2, and when the solid gas collecting device reaches the sea surface, the solid gas is collected by the hoisting system 12 and is conveniently placed on a deck; after the solid hydrate is completely decomposed, outputting methane gas by using a pressure reduction gas transmission valve 21 to finish a construction process; the empty solid gas collecting device 2 can be continuously used for repeating the next construction process.
It should be noted that the overall collection efficiency of the in-situ planted hydrate provided by the invention is limited by the flux of the cold spring, especially the flux after reaming and diversion. Therefore, in the case of the mud volcano 5 which develops the cold spring and the hydrate layer on the shallow surface, the central position with larger fracture and fluid passage needs to be searched for reaming and flow guiding, and then collection is carried out, so that higher production efficiency can be ensured. In addition, the overall collection efficiency is also limited by the turnover rate of the solid-gas collection devices 2, and therefore, a plurality of solid-gas collection devices 2 are required to be alternately used without interruption. In addition, during the collection operation, the wellhead flow control device 43 should be fully utilized to adjust the flow rate and properly reduce unnecessary gas loss during the replacement of the solid gas collection device 2. By combining the links and factors, a certain production rate can be ensured, the in-situ planting rate of the hydrate and the final gas production rate are improved, and the influence of the fluid on the seawater environment is reduced.
The in-situ planting and collecting system for the sea area natural gas hydrate is suitable for a cold spring with a certain water depth (such as a water depth larger than 500 meters), and in the depth range, a stable zone of the natural gas hydrate is positioned above the sea bottom, so that the solid hydrate can be rapidly formed in the planting system under the natural condition in the solid gas collecting device 2, and the gas can be collected as far as possible. Theoretically, 1 volume of solid hydrate can contain 164-172 volumes of methane gas, and therefore, the solid hydrate can be formed only to have high collection efficiency. And after the methane gas is lifted upwards from the anchoring weight 27 and is hoisted to an engineering ship or a drilling platform 1, the methane gas is automatically converted into a gas-water phase state under the conditions of natural temperature and atmospheric pressure, so that the methane gas can be directly obtained. In the two conversion processes of gas phase-solid phase-gas phase in one construction flow, only the temperature and the pressure difference naturally existing between the sea bottom and the sea surface are utilized, and external energy does not need to be consumed; after the underwater self-floating anchor is separated from the seabed, the underwater self-floating anchor also rises upwards by means of the buoyancy of the underwater self-floating anchor without consuming external energy, and in the whole construction process, energy is consumed only in reaming diversion and seabed anchoring construction, so that the cost is greatly reduced, and pollution possibly caused by common construction is avoided.
Meanwhile, the device provided by the invention intercepts the direct entering of the cold spring fluid into the seawater, reduces the negative effects of methane gas on the acidification and oxygen deficiency of the seawater, greatly reduces the possibility that the cold spring removed fluid directly enters the atmosphere, has a good effect on relieving the global warming trend, and also has certain social benefits.
Similar technical solutions can be derived from the solutions given in the figures and the description, as described above. However, the technical solution of the present invention is still within the scope of the claims unless the content of the structure of the present invention is departed from.
Claims (7)
1. The in-situ planting and collecting system for the sea natural gas hydrate is characterized in that: comprises a cold spring reaming and finished product collecting unit, a cold spring gas-collecting planting unit and a submarine engineering auxiliary unit;
the cold spring reaming and finished product collecting unit comprises an engineering ship or a drilling platform (1), a drilling device (11) and a hoisting system (12);
the cold spring gas collection planting unit comprises a solid gas collection device (2) and a reaming and flow guiding system (4);
the solid gas collecting device (2) is provided with a pressure reduction gas transmission valve (21), a pressure sensor, an intelligent control unit (25), an automatic closing device (29), a Beidou positioning device (22), a hoisting ring (23) and an anchoring weight block (27) connected with an anchor rope (28), and the anchor rope (28) is connected with a releaser (26);
the reaming and flow guiding system 4 comprises a casing (41), a perforation (42) arranged on the wall of the casing (41) and an wellhead flow control device (43);
the auxiliary unit for the submarine engineering comprises an engineering crawler (3) connected with an engineering ship or a drilling platform (1) through a crawler umbilical cable (31), and a crawler repeater (32) is connected to the crawler umbilical cable (31).
2. The in-situ planting and collecting method of the sea area natural gas hydrate in-situ planting and collecting system according to claim 1, wherein the in-situ planting and collecting method comprises the following steps: comprises the operation implementation process of a cold spring reaming and finished product collecting unit and a cold spring gas-collecting planting unit;
the operation process of the cold spring reaming and finished product collecting unit is as follows,
firstly, drilling and reaming a cold spring leakage center by using an engineering ship or a drilling platform (1) and a drilling device (11);
then, a reaming diversion system (4) is arranged and supported, and a sleeve (41) with a perforation (42) is arranged, so that fluid enters the sleeve (41) along with the pressure difference between the inside and the outside;
the operation implementation process of the cold spring gas-collecting planting unit is as follows,
firstly, throwing an engineering crawler (3) from an engineering ship or a drilling platform (1);
then, an anchoring weight (27) is thrown in;
then, arranging a solid gas collecting device (2);
in the whole collection process, the buoyancy of the solid gas collection device (2) is sensed by a pressure sensor and an intelligent control unit (25), and when a preset threshold value is reached, the solid gas collection device (2) is separated from an anchoring weight block (27) and floats to the sea surface to rise under the driving of the buoyancy difference;
finally, when the solid gas collecting device (2) reaches the sea surface, the solid gas is collected by the hoisting system (12) through the hoisting ring (23); after the solid hydrate is completely decomposed, outputting methane gas by using a pressure reduction gas transmission valve (21);
and the solid gas collecting device (2) completes one construction process and is continuously used for repeating the next construction process.
3. The in-situ planting and collecting method of sea natural gas hydrates according to claim 2, wherein: in the operation process of the cold spring reaming and finished product collecting unit, a wellhead flow control device (43) is arranged at the seabed wellhead; during production, the engineering crawler (3) is used to close and open the wellhead flow control device (43).
4. The in-situ planting and collecting method of sea natural gas hydrates according to claim 2 or 3, wherein: in the operation process of cold spring reaming and finished product collecting units, the engineering crawler (3) is connected with an engineering ship or a drilling platform (1) through a crawler umbilical cable (31), and a crawler repeater (32) is connected to the crawler umbilical cable (31).
5. The in-situ planting and collecting method of sea natural gas hydrates according to claim 4, wherein: and in the operation process of the cold spring reaming and finished product collecting unit, an engineering crawler (3) is used for throwing the anchoring weight block (27) and properly arranging the anchoring weight block around the reaming and flow guiding system (4).
6. The in-situ planting and collecting method of sea natural gas hydrates according to claim 5, wherein: in the operation process of the cold spring reaming and finished product collecting unit, the engineering crawler (3) is used for connecting the solid gas collecting device (2) with the anchoring weight block (27) through the anchor cable (28).
7. The in-situ planting and collecting method of sea natural gas hydrates according to claim 6, wherein: when the internal pressure of the solid-gas acquisition device (2) reaches a preset threshold value, the automatic sealing device (29) closes the solid-gas acquisition device (2) in an air tightness processing mode; the pressure sensor and the intelligent control unit (25) give an instruction to the releaser (26) to release the solid gas acquisition device (2).
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| CN112253057B (en) * | 2020-10-09 | 2021-08-10 | 青岛海洋地质研究所 | Efficient exploitation method of pore filling type natural gas hydrate |
| CN112709552B (en) * | 2020-10-19 | 2022-03-08 | 青岛海洋地质研究所 | Device and method for developing marine natural gas hydrate system based on hydrate method |
| CN113187444A (en) * | 2021-05-08 | 2021-07-30 | 王智刚 | Mining and safe storage and transportation technology of deep-sea combustible ice |
| CN113432660B (en) * | 2021-05-31 | 2022-10-04 | 青岛海洋地质研究所 | In-situ on-line measuring device and measuring method for natural gas leakage flow of seabed cold spring |
| CN113624639B (en) * | 2021-07-05 | 2022-10-14 | 青岛海洋地质研究所 | Device and method for rapidly measuring instant flux of deep sea seabed gas leakage |
| CN117211739B (en) * | 2023-09-22 | 2024-04-09 | 青岛海洋地质研究所 | Ocean natural gas hydrate normal position planting device |
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| CN204851193U (en) * | 2015-07-30 | 2015-12-09 | 迈瑞尔实验设备（上海）有限公司 | Mining devices of seabed combustible ice |
| CN205714123U (en) * | 2016-06-16 | 2016-11-23 | 山东省科学院海洋仪器仪表研究所 | A kind of cold seepage district seepage Gas Exploitation acquisition means |
| CN108643868B (en) * | 2018-03-16 | 2021-01-01 | 中国石油天然气集团有限公司 | Intelligent robot for exploiting seabed natural gas hydrate |
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