CN105822282A - External buoyancy tank helical pipeline heating subsea natural gas collection device and method - Google Patents
External buoyancy tank helical pipeline heating subsea natural gas collection device and method Download PDFInfo
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- CN105822282A CN105822282A CN201610170975.8A CN201610170975A CN105822282A CN 105822282 A CN105822282 A CN 105822282A CN 201610170975 A CN201610170975 A CN 201610170975A CN 105822282 A CN105822282 A CN 105822282A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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Abstract
The invention discloses an external buoyancy tank helical pipeline heating subsea natural gas collection device and method, and relates to the technical field of natural gas collection. The external buoyancy tank helical pipeline heating subsea natural gas collection device comprises a mother ship and a hollow-out natural gas collection cover, wherein a natural gas collection and storage device and pressure supply modules are arranged on the mother ship; the natural gas collection and storage device is connected with the top of the natural gas collection cover through a gas production pipeline; the natural gas collection cover is connected to the bottom of the mother ship through a marine riser; the gas production pipeline is arranged in the marine riser; an anchoring system is arranged around the bottom of the natural gas collection cover; a pressure regulation system is arranged at the bottom of the natural gas collection cover; a temperature regulation system and a stirring system are arranged inside the natural gas collection cover; a propelling system and a density regulation system are arranged on the outer wall of the natural gas collection cover. The external buoyancy tank helical pipeline heating subsea natural gas collection device and method disclosed by the invention mainly solve the problem of dissipation or leakage of natural gas in the decomposed collecting and producing process of natural gas hydrate on a subsea mud bed.
Description
Technical field
The present invention relates to natural gas and gather technical field, especially sea bed gas hydrate acquisition technique.
Background technology
Sea bed gas hydrate is the crystalline solid that methane gas is formed with water molecules under the cryogenic high pressure environment in seabed, is the clean energy resource that a kind of reserves are huge, is hopeful petroleum replacing, coal becomes main energy sources.Gas hydrates are distributed widely in submarine sedimentary strata, have reserves cementing, the feature of poor stability big, weak, and once the temperature of region, pressure condition change, it is possible to cause a large amount of decomposition, the gasification of sea bed gas hydrate and freely discharge.
Owing to gas hydrates main decomposition is methane gas and water, but methane gas is greenhouse gases, discharges into the atmosphere in a large number and can cause greenhouse effect, does great damage environment.How to ensure to exploit natural gas during the gas hydrates in seabed do not reveal, not loss and the most high efficiency decomposition gas hydrates, be all the main direction of studying of current sea bed gas hydrate mineral reserve exploitation.
In existing exploitation of gas hydrates technology, generally by voltage drop method, heat injection method or note chemical-agent technique etc., the Gas Hydrate that seabed has is converted into gas and water, the gas obtained after converting is collected, produced by underwater production facility or floating production facility again, the exploitation way and the system that there is presently no the sea bed gas hydrate of a kind of maturation are formally put into commercial operation, and the state such as the U.S., Japan all carries out the exploitation of experimental.
Main cause is that existing exploitation way is the most more complicated, cost is high, and lack controllability and operability, easily cause the leakage of methane gas, cause the greenhouse effect of environmental pollution and air, production efficiency is also unable to reach commercial development minimum requirements, all also in the test chamber exploratory stage, it is impossible to put into commercial operation.Accordingly, it would be desirable to one is capable of environmental protection, the mining system of economical and efficient, it is achieved the exploitation to sea bed gas hydrate.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, sea-bottom natural gas collection device and method that a kind of external buoyancy tank helical pipe heats are provided, mainly solve the gas hydrates of seabed mud bed, collect and during exploitation decomposing, the loss of natural gas and the problem of leakage will not be formed, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improve the acquisition rate of natural gas, exploitation for sea bed gas hydrate provides new direction；Visible, the present invention can by density, pressure, temperature control to ensure steady production, natural gas collection is convenient, collecting efficiency high, can repeatedly use.
The technical solution used in the present invention is as follows:
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, natural gas collecting hood including lash ship and interior sky, described lash ship is provided with natural gas storage device and for die block, described natural gas storage device connects natural gas collecting hood top by gas production pipe, described natural gas collecting hood is connected to bottom lash ship by marine riser, and described gas production pipe is located in marine riser；Bottom described natural gas collecting hood, surrounding is disposed with anchoring system, is provided with pressure regulating system in the bottom of natural gas collecting hood, is provided with humidity control system and agitation system inside described natural gas collecting hood, and described natural gas collecting hood outer wall is provided with propulsion system；The outer wall of described natural gas collecting hood is provided with Auto-regulating System of Density of Heavy Medium system, and described Auto-regulating System of Density of Heavy Medium system includes buoyant module, for die block gentle pressure pipe road；The most some buoyant module are arranged on the outer wall of housing, described buoyant module includes the interior empty van body sealed, electronic liquid level gauge is set in described casing, inside and outside drain pipe and air inlet pipe it is communicated with on described casing, the air inlet pipe of all buoyant module is parallel on pneumatic circuit, and described pneumatic circuit is fixed on the outer wall of housing and through being connected to for die block from marine riser.
Due to said structure, lash ship operates across the sea for operator and controls.Natural gas collecting hood can cover on the seabed mud bed specifying region, and seals the seabed mud bed in this region, and is collected the natural gas in this region, and the natural gas storage device being sent on lash ship by Gas Exploitation air pipe is stored up.Marine riser is for being all placed in one gas production pipe, pneumatic circuit, ventilation channel and cable etc., it is to avoid the sea water corrosion to it, it is ensured that its life-span.Anchoring system is located at surrounding bottom natural gas collecting hood, can be sealingly fastened in by collecting hood on the mud bed of seabed, it is ensured that leak during carrying out natural gas collection.Liquid in collecting hood can be discharged by pressure regulating system, forms negative pressure, promote the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate in making airtight collecting hood；Humidity control system, it is mainly used for when temperature value is relatively low in collecting hood, for increasing the temperature within natural gas collecting hood, thus improves the internal temperature of natural gas collecting hood, make the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate.Agitation system then, is after specifying region to gather certain time, is stirred seabed mud bed by agitation system, thus promote the deep layer decomposition of hydrate of seabed mud bed.Propulsion system, when can be used for transferring to natural gas collecting hood specify region, is finely adjusted collecting hood, to guarantee being accurately positioned of collecting hood.And Auto-regulating System of Density of Heavy Medium system, then it is that the density to natural gas collecting hood itself is adjusted, thus controls raising and decentralizing of collecting hood.Wherein Auto-regulating System of Density of Heavy Medium system, by producing pressed gas for die block, and feeds pressed gas by pneumatic circuit in the casing of buoyant module, thus can by the water discharge in casing, thus the density reducing collecting hood itself carry out on carry；On the contrary being collected when transferring of cover, can be discharged by the pressed gas in control chamber body, sea water increases the density of collecting hood itself in entering casing, make collecting hood transfer to seabed mud bed.All buoyant module are located on collecting hood outer wall so that buoyant module is easily installed and fixes, and collecting hood is difficult to be affected by and produce movement equally, be more conducive to transport and preserve；It addition, all buoyant module are located on collecting hood outer wall, it is more accurate on the impact of collecting hood and control by buoyancy to make buoyant module.The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, mainly solve the gas hydrates of seabed mud bed, collect and during exploitation decomposing, the loss of natural gas and the problem of leakage will not be formed, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improving the acquisition rate of natural gas, the exploitation for sea bed gas hydrate provides new direction；Visible, the present invention can by density, pressure, temperature control to ensure steady production, natural gas collection is convenient, collecting efficiency high, can repeatedly use.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, described humidity control system includes ventilation channel, apparatus of oxygen supply and heater, described apparatus of oxygen supply is arranged on lash ship, ventilation channel is connected on described apparatus of oxygen supply, described ventilation channel stretches into inside natural gas collecting hood through marine riser, the part that described ventilation channel is positioned within natural gas collecting hood is arranged in the shape of a spiral, is wherein fixed with some heaters on the spiral position of ventilation channel.
Due to said structure, apparatus of oxygen supply produces oxygen, by ventilation channel, oxygen is supplied to heater, and oxygen reacts in heater with natural gas, and produce heat raising natural gas collecting hood internal temperature, it is beneficial to promote the gas hydrate dissociation of seabed mud bed kind.The part that wherein ventilation channel is positioned within natural gas collecting hood is arranged in the shape of a spiral, thus farthest heat in more meeting collecting hood region, thus uniformly heat up in promoting the whole region of collecting hood, it is to avoid the technical problem that the excessive natural gas brought of local temperature difference gathers and causes danger.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, described natural gas collecting hood includes housing, top platform, baffle plate and suspension ring, the hollow pyramid structure of described housing, the top of described housing is set to top platform, it is sealedly connected with a circle ring baffle on the base of described housing, in the middle part of the outer wall of described housing, is provided with some suspension ring.
Due to said structure, the housing of the pyramid structure of interior sky, making housing be easy to manufacture, and structure is relatively reliable, more conducively natural gas concentrates on the inner top of housing, it is simple to the collection of weather.Can be used for arranging buoyant module between ectonexine housing, so that whole collecting hood more compact structure；Top platform is used for connecting marine riser, it is simple to be attached between lash ship and collecting hood.The ring baffle on the base of housing, can will seal with seabed mud bed bottom collecting hood, thus forms negative pressure in can ensure that collecting hood, promotes the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate.Suspension ring, on the one hand can be used for lifting by crane collecting hood, on the other hand can be used for connecting floating buoyant module, improve the control ability to collecting hood buoyancy.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, described anchoring system is located at surrounding bottom natural gas collecting hood, described anchoring system includes screw rod, motor, actuating device and airtight anchoring shell, described anchoring shell is fixed on baffle plate top, it is fixed with motor in described anchoring shell, described motor connects actuating device and drives screw rod rotary motion, and described screw rod passes the bottom of anchoring shell.
Due to said structure, available motor controls screw rod by actuating device, screw rod is extend in the mud bed of seabed, collecting hood is fixed on the mud bed of seabed, guarantee sealing and the stability of collecting hood, avoid the impact on collecting hood of the environments such as subsea factor, thus can be effectively prevented from during decomposing collection and exploitation, the loss of natural gas and the problem of leakage.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, one end of described gas production pipe is positioned at top platform and connects inside natural gas collecting hood, and the other end is positioned on lash ship connection natural gas storage device；Wherein it is equipped with gas production pipe, pneumatic circuit, ventilation channel and cable in marine riser.
Due to said structure, gas production pipe is mainly used in connecting natural gas collecting hood and natural gas storage device, and the natural gas that can will collect in collecting hood, through gas production pipe by natural gas transmission to natural gas storage device.Wherein marine riser can be used for, by the pipeline being connected between lash ship with collecting hood and cable etc., effectively protecting pipeline and cable so that it is the life-span is more permanent.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, described pressure regulating system is located at the bottom of natural gas collecting hood, described pressure regulating system includes immersible pump and suction box, described suction box is placed in inside natural gas collecting hood, described immersible pump is fixed on natural gas collecting hood, described immersible pump connects suction box by water supply hose, and described immersible pump is communicated to outside natural gas collecting hood by outlet pipe.
Due to said structure, this pressure regulating system can pass through suction box, sea water within collecting hood is expelled to outside collecting hood by water supply hose and immersible pump, so that collecting hood is internally formed negative pressure, it is more conducive to promote the gas hydrate dissociation of seabed mud bed kind, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improves the acquisition rate of natural gas；Pressure regulating system also ensures that the internal pressure of natural gas collecting hood is stable simultaneously.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, the inner lower of described natural gas collecting hood is provided with agitation system, described agitation system includes driving and water jet device, inner walls is fixed in described driving, and described water jet device is installed on driving upper energy following vehicle and moves.
Due to said structure, after the gas hydrates in same appointment sea-bed area gather certain time, start agitation system, control water jet device alignment seabed mud bed and spray High-Pressure Water, agitation seabed mud bed promotes deep layer decomposition of hydrate, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improves the acquisition rate of natural gas.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, described propulsion system includes carrying platform, screw propeller and motor, described carrying platform is fixed on the outer middle side part of natural gas collecting hood, and motor connects screw propeller and is arranged on carrying platform.
Due to said structure, when collecting hood is transferred to close to precalculated position constantly, propulsion system can be started natural gas collecting hood is carried out fine position, it can be ensured that collecting hood arrives precalculated position, be more conducive to natural gas gathering in presumptive area.
The sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, it is provided with monitoring system in described natural gas collecting hood, described monitoring system includes temperature and pressure monitoring device and shell stress monitoring device, described temperature and pressure monitoring device are arranged on inside top platform, and some shell stress monitoring devices are arranged on the hull outside of natural gas collecting hood；Described monitoring system, propulsion system, pressure regulating system, anchoring system, agitation system, humidity control system and Auto-regulating System of Density of Heavy Medium system are connected to control centre by cable respectively, and described control centre is located on lash ship.
Due to said structure, monitoring system can be monitored in collecting hood with implementing and force value on collecting hood, temperature value, thus can be monitored collecting hood in real time, it is to avoid pressure on natural gas collecting hood is excessive causes danger, it is ensured that operate safe and reliable；Or the too low collection that can not carry out natural gas of temperature, improves the acquisition rate of natural gas.
The sea-bottom natural gas acquisition method of the external buoyancy tank helical pipe heating of the present invention, is realized by following steps:
Step 1, lash ship 5) if transport dry gas collecting hood is to specifying sea-bed area, control Auto-regulating System of Density of Heavy Medium system water-filling in buoyant module, control natural gas collecting hood and transfer to during close to precalculated position, start propulsion system and natural gas collecting hood is carried out fine position；
After step 2, natural gas collecting hood reach precalculated position, control ring baffle and insert seabed mud bed, start anchoring system and make screw rod stretch in the mud bed of seabed, natural gas collecting hood is fixed and seals；
Step 3, unlatching pressure regulating system, discharge the sea water within natural gas collecting hood, make natural gas collecting hood be internally formed negative pressure and promote decomposition of hydrate, gas hydrates are collected by gas production pipe and are processed and store to natural gas storage device, monitoring system monitoring natural gas collecting hood internal pressure change simultaneously, adjust the duty of pressure regulating system in real time, it is ensured that the internal pressure of natural gas collecting hood is stable；
Step 4, monitoring system monitoring natural gas collecting hood internal temperature values, and detection temperature value is compared with setting value, if temperature value is relatively low, start-up temperature regulation system, apparatus of oxygen supply produces oxygen, by ventilation channel, oxygen is supplied to heater, control oxygen to react in heater with natural gas, and produce heat improve natural gas collecting hood internal temperature, when temperature value reaches preset value, control apparatus of oxygen supply stop produce oxygen；
Step 5, when the gas hydrates in same appointment sea-bed area gathered after certain time, start agitation system, control water jet device alignment seabed mud bed and also spray High-Pressure Water, agitation seabed mud bed promotes deep water compound to divide；
Step 6, when specify sea-bed area natural gas extraction complete after, Auto-regulating System of Density of Heavy Medium system is by supplying to buoyant module, reduce the global density of natural gas collecting hood, anchoring system releases fixing, on natural gas collecting hood and lift-off from the contacting of seabed mud bed, propulsion system promotes natural gas collecting hood to move to next one territory to be exploited, and repeats step 2 to step 5.
By the control of the natural gas collecting hood of precision, applying on sea-bottom natural gas is collected, the exploitation for sea bed gas hydrate provides new direction.The acquisition method of the present invention, solve the gas hydrates of seabed mud bed, collecting decomposing and during exploitation, will not form the loss of natural gas and the problem of leakage, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate, the most greatly improve the acquisition rate of natural gas, can repeatedly use, the life-span is permanent.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, the sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention and method, mainly solve the gas hydrates of seabed mud bed, collect and during exploitation decomposing, the loss of natural gas and the problem of leakage will not be formed, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improve the acquisition rate of natural gas, exploitation for sea bed gas hydrate provides new direction.
2, the present invention can by density, pressure, temperature control to ensure steady production, natural gas collection is convenient, collecting efficiency high, can repeatedly use, and novel, structure is ingenious, and the life-span is permanent, can be widely used for sea-bottom natural gas collection, applied widely, it is suitable for popularization and application.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the schematic diagram of buoyant module in the present invention.
Labelling in figure: 1-natural gas collecting hood, 101-housing, 102-top platform, 103-baffle plate, 104-suspension ring；2-Auto-regulating System of Density of Heavy Medium system, 201-buoyant module, 202-for die block, 203,11-pneumatic circuit, 204-electrically operated valve, 205-air inlet pipe, 206-drain pipe, 207 electronic liquid level gauges；3-pressure regulating system, 301-immersible pump, 302-suction box；4-humidity control system, 401-ventilation channel, 402-apparatus of oxygen supply, 403-heater；5-lash ship, 6-propulsion system, 7-natural gas storage device, 8-anchoring system, 801-screw rod, 802-motor, 803-actuating device；9-agitation system, 10-monitors system, 12-gas production pipe, 13-marine riser.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, in addition to mutually exclusive feature and/or step, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary), unless specifically stated otherwise, all can be by other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, an example during each feature is a series of equivalence or similar characteristics.
As depicted in figs. 1 and 2, the sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating of the present invention, natural gas collecting hood 1 including lash ship 5 and interior sky, described lash ship 5 is provided with natural gas storage device 7 and for die block 202, described natural gas storage device 7 connects natural gas collecting hood 1 top by gas production pipe 12, described natural gas collecting hood 1 is connected to bottom lash ship 5 by marine riser 13, and described gas production pipe 12 is located in marine riser 13；Bottom described natural gas collecting hood 1, surrounding is disposed with anchoring system 8, it is provided with pressure regulating system 3 in the bottom of natural gas collecting hood 1, described natural gas collecting hood 1 is internal is provided with humidity control system 4 and agitation system 9, and described natural gas collecting hood 1 outer wall is provided with propulsion system 6；The outer wall of described natural gas collecting hood 1 is provided with Auto-regulating System of Density of Heavy Medium system 2, and described Auto-regulating System of Density of Heavy Medium system 2 includes buoyant module 201, for die block 202 and pneumatic circuit 203；The most some buoyant module 201 are arranged on the outer wall of housing 101, described buoyant module 201 includes the interior empty van body sealed, electronic liquid level gauge 207 is set in described casing, inside and outside drain pipe 206 and air inlet pipe 205 it is communicated with on described casing, the air inlet pipe 205 of all buoyant module 201 is parallel on pneumatic circuit 203, and described pneumatic circuit 203 is fixed on the outer wall of housing 101 and through being connected to for die block 202 from marine riser 13.
Wherein said humidity control system 4 includes ventilation channel 401, apparatus of oxygen supply 402 and heater 403, described apparatus of oxygen supply 402 is arranged on lash ship 5, ventilation channel 401 is connected on described apparatus of oxygen supply 402, it is internal that described ventilation channel 401 stretches into natural gas collecting hood 1 through marine riser 13, the part that described ventilation channel 401 is positioned within natural gas collecting hood 1 is arranged in the shape of a spiral, is wherein fixed with some heaters 403 on the spiral position of ventilation channel 401.
Wherein said natural gas collecting hood 1 includes housing 101, top platform 102, baffle plate 103 and suspension ring 104, the described hollow pyramid structure of housing 101, the top of described housing 101 is set to top platform 102, it is sealedly connected with a circle ring baffle 103 on the base of described housing 101, in the middle part of the outer wall of described housing 101, is provided with some suspension ring 104.
Wherein said anchoring system 8 is located at surrounding bottom natural gas collecting hood 1, described anchoring system 8 includes screw rod 801, motor 802, actuating device 803 and airtight anchoring shell, described anchoring shell is fixed on baffle plate 103 top, it is fixed with motor 802 in described anchoring shell, described motor 802 connects actuating device 803 and drives screw rod 801 rotary motion, and described screw rod 801 passes the bottom of anchoring shell.
One end of wherein said gas production pipe 12 is positioned at top platform 102 and connects natural gas collecting hood 1 inside, and the other end is positioned on lash ship 5 connection natural gas storage device 7；Wherein it is equipped with gas production pipe 12, pneumatic circuit 203, ventilation channel 401 and cable in marine riser 13.
Wherein said pressure regulating system 3 is located at the bottom of natural gas collecting hood 1, described pressure regulating system 3 includes immersible pump 301 and suction box 302, it is internal that described suction box 302 is placed in natural gas collecting hood 1, described immersible pump 301 is fixed on natural gas collecting hood 1, described immersible pump 301 connects suction box 302 by water supply hose, and it is outside that described immersible pump 301 is communicated to natural gas collecting hood 1 by outlet pipe.
The inner lower of wherein said natural gas collecting hood 1 is provided with agitation system 9, and described agitation system 9 includes driving a vehicle 901 and water jet device 902, and housing 101 inwall is fixed in described driving 901, and described water jet device 902 is installed in driving 901 and can move by following vehicle.
Wherein said propulsion system 6 includes carrying platform 601, screw propeller 602 and motor 603, and described carrying platform 601 is fixed on the outer middle side part of natural gas collecting hood 1, and motor 603 connects screw propeller 622 and is arranged on carrying platform 601.
It is provided with monitoring system 10 in wherein said natural gas collecting hood 1, described monitoring system 10 includes temperature and pressure monitoring device and shell stress monitoring device, it is internal that described temperature and pressure monitoring device are arranged on top platform 102, and the housing 101 that some shell stress monitoring devices are arranged on natural gas collecting hood 1 is outside；Described monitoring system 10, propulsion system 6, pressure regulating system 3, anchoring system 8, agitation system 9, humidity control system 4 and Auto-regulating System of Density of Heavy Medium system 2 are connected to control centre by cable respectively, and described control centre is located on lash ship 5.
Lash ship operates across the sea for operator and controls.Natural gas collecting hood can cover on the seabed mud bed specifying region, and seals the seabed mud bed in this region, and is collected the natural gas in this region, and the natural gas storage device being sent on lash ship by Gas Exploitation air pipe is stored up.Marine riser is for being all placed in one gas production pipe, pneumatic circuit, ventilation channel and cable etc., it is to avoid the sea water corrosion to it, it is ensured that its life-span.Anchoring system is located at surrounding bottom natural gas collecting hood, can be sealingly fastened in by collecting hood on the mud bed of seabed, it is ensured that leak during carrying out natural gas collection.Liquid in collecting hood can be discharged by pressure regulating system, forms negative pressure, promote the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate in making airtight collecting hood；Humidity control system, it is mainly used for when temperature value is relatively low in collecting hood, for increasing the temperature within natural gas collecting hood, thus improves the internal temperature of natural gas collecting hood, make the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate.Agitation system then, is after specifying region to gather certain time, is stirred seabed mud bed by agitation system, thus promote the deep layer decomposition of hydrate of seabed mud bed.Propulsion system, when can be used for transferring to natural gas collecting hood specify region, is finely adjusted collecting hood, to guarantee being accurately positioned of collecting hood.And Auto-regulating System of Density of Heavy Medium system, then it is that the density to natural gas collecting hood itself is adjusted, thus controls raising and decentralizing of collecting hood.Wherein Auto-regulating System of Density of Heavy Medium system, by producing pressed gas for die block, and feeds pressed gas by pneumatic circuit in the casing of buoyant module, thus can by the water discharge in casing, thus the density reducing collecting hood itself carry out on carry；On the contrary being collected when transferring of cover, can be discharged by the pressed gas in control chamber body, sea water increases the density of collecting hood itself in entering casing, make collecting hood transfer to seabed mud bed.All buoyant module are located on collecting hood outer wall so that buoyant module is easily installed and fixes, and collecting hood is difficult to be affected by and produce movement equally, be more conducive to transport and preserve；It addition, all buoyant module are located on collecting hood outer wall, it is more accurate on the impact of collecting hood and control by buoyancy to make buoyant module.The sea bed gas hydrate harvester of the present invention, mainly solve the gas hydrates of seabed mud bed, collect and during exploitation decomposing, the loss of natural gas and the problem of leakage will not be formed, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, it is beneficial to the exploitation of sea bed gas hydrate, the most greatly improving the acquisition rate of natural gas, the exploitation for sea bed gas hydrate provides new direction；Visible, the present invention can by density, pressure, temperature control to ensure steady production, natural gas collection is convenient, collecting efficiency high, can repeatedly use.
The sea bed gas hydrate acquisition method of the external buoyancy tank helical pipe heating of the present invention, is realized by following steps:
If step one, lash ship 5 transport dry gas collecting hood 1 to specifying sea-bed area, control Auto-regulating System of Density of Heavy Medium system 2 water-filling in buoyant module 201, control natural gas collecting hood 1 to transfer to during close to precalculated position, start propulsion system 6 and natural gas collecting hood 1 is carried out fine position；
After step 2, natural gas collecting hood 1 reach precalculated position, control ring baffle 103 and insert seabed mud bed, start anchoring system 5 and make screw rod 801 stretch in the mud bed of seabed, natural gas collecting hood 1 is fixed and seals；
Step 3, unlatching pressure regulating system 3, discharge the sea water within natural gas collecting hood 1, make natural gas collecting hood 1 be internally formed negative pressure and promote decomposition of hydrate, gas hydrates are collected by gas production pipe 12 and are processed to natural gas storage device 7 and store, monitoring system 10 monitors the change of natural gas collecting hood 1 internal pressure simultaneously, adjust the duty of pressure regulating system 3 in real time, it is ensured that the internal pressure of natural gas collecting hood 1 is stable；
Step 4, monitoring system 10 monitor natural gas collecting hood 1 internal temperature values, and detection temperature value is compared with setting value, if temperature value is relatively low, start-up temperature regulation system 4, apparatus of oxygen supply 402 produces oxygen, by ventilation channel 401, oxygen is supplied to heater 403, control oxygen and natural gas and 403 react in heater, and produce heat improve natural gas collecting hood 1 internal temperature, when temperature value reaches preset value, control apparatus of oxygen supply 402 stop produce oxygen；
Step 5, when the gas hydrates in same appointment sea-bed area gathered after certain time, start agitation system 9, control water jet device 902 and be directed at seabed mud bed and spray High-Pressure Water, agitation seabed mud bed promotes deep water compound to divide；
Step 6, when specify sea-bed area natural gas extraction complete after, Auto-regulating System of Density of Heavy Medium system 2 is by supplying to buoyant module 201, reduce the global density of natural gas collecting hood 1, anchoring system 8 releases fixing, on natural gas collecting hood 1 and lift-off from the contacting of seabed mud bed, propulsion system 6 promotes natural gas collecting hood 1 to move to next one territory to be exploited, and repeats step 2 to step 5.
By the control of the natural gas collecting hood of precision, applying on sea-bottom natural gas is collected, the exploitation for sea bed gas hydrate provides new direction.The acquisition method of the present invention, solve the gas hydrates of seabed mud bed, collecting decomposing and during exploitation, will not form the loss of natural gas and the problem of leakage, the present invention breaks through conventional thought pattern, utilize pressure regulation to form negative pressure dexterously and humidity control system heats, promote the gas hydrate dissociation of seabed mud bed kind, the beneficially exploitation of sea bed gas hydrate, the most greatly improve the acquisition rate of natural gas, can repeatedly use, the life-span is permanent.
The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any new feature disclosed in this manual or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (10)
- The sea-bottom natural gas collection device of the most external buoyancy tank helical pipe heating, it is characterized in that: include the natural gas collecting hood (1) of lash ship (5) and interior sky, described lash ship (5) is provided with natural gas storage device (7) and for die block (202), described natural gas storage device (7) connects natural gas collecting hood (1) top by gas production pipe (12), described natural gas collecting hood (1) is connected to lash ship (5) bottom by marine riser (13), and described gas production pipe (12) is located in marine riser (13)；Described natural gas collecting hood (1) bottom surrounding is disposed with anchoring system (8), it is provided with pressure regulating system (3) in the bottom of natural gas collecting hood (1), described natural gas collecting hood (1) is internal is provided with humidity control system (4) and agitation system (9), and described natural gas collecting hood (1) outer wall is provided with propulsion system (6)；The outer wall of described natural gas collecting hood (1) is provided with Auto-regulating System of Density of Heavy Medium system (2), and described Auto-regulating System of Density of Heavy Medium system (2) includes buoyant module (201), for die block (202) and pneumatic circuit (203)；The most some buoyant module (201) are arranged on the outer wall of housing (101), described buoyant module (201) includes the interior empty van body sealed, electronic liquid level gauge (207) is set in described casing, inside and outside drain pipe (206) and air inlet pipe (205) it is communicated with on described casing, the air inlet pipe (205) of all buoyant module (201) is parallel on pneumatic circuit (203), and described pneumatic circuit (203) is fixed on the outer wall of housing (101) and through being connected to for die block (202) from marine riser (13).
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 1 heating, it is characterized in that: described humidity control system (4) includes ventilation channel (401), apparatus of oxygen supply (402) and heater (403), described apparatus of oxygen supply (402) is arranged on lash ship (5), ventilation channel (401) is connected on described apparatus of oxygen supply (402), it is internal that described ventilation channel (401) stretches into natural gas collecting hood (1) through marine riser (13), the part that described ventilation channel (401) is positioned at natural gas collecting hood (1) internal is arranged in the shape of a spiral, wherein it is fixed with some heaters (403) on the spiral position of ventilation channel (401).
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 2 heating, it is characterized in that: described natural gas collecting hood (1) includes housing (101), top platform (102), baffle plate (103) and suspension ring (104), described housing (101) hollow pyramid structure, the top of described housing (101) is set to top platform (102), it is sealedly connected with a circle ring baffle (103) on the base of described housing (101), in the middle part of the outer wall of described housing (101), is provided with some suspension ring (104).
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 3 heating, it is characterized in that: described anchoring system (8) is located at natural gas collecting hood (1) bottom surrounding, described anchoring system (8) includes screw rod (801), motor (802), actuating device (803) and airtight anchoring shell, described anchoring shell is fixed on baffle plate (103) top, motor (802) it is fixed with in described anchoring shell, described motor (802) connects actuating device (803) and drives screw rod (801) rotary motion, described screw rod (801) passes the bottom of anchoring shell.
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 3 heating, it is characterized in that: one end of described gas production pipe (12) is positioned at top platform (102) and connects natural gas collecting hood (1) inside, and the other end is positioned at lash ship (5) upper connection natural gas storage device (7)；Wherein it is equipped with gas production pipe (12), pneumatic circuit (203), ventilation channel (401) and cable in marine riser (13).
- 6. the sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating as described in claim 3 or 4 or 5, it is characterized in that: described pressure regulating system (3) is located at the bottom of natural gas collecting hood (1), described pressure regulating system (3) includes immersible pump (301) and suction box (302), it is internal that described suction box (302) is placed in natural gas collecting hood (1), described immersible pump (301) is fixed on natural gas collecting hood (1), described immersible pump (301) is by water supply hose connection suction box (302), it is outside that described immersible pump (301) is communicated to natural gas collecting hood (1) by outlet pipe.
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 6 heating, it is characterized in that: the inner lower of described natural gas collecting hood (1) is provided with agitation system (9), described agitation system (9) includes drive a vehicle (901) and water jet device (902), housing (101) inwall is fixed in described driving (901), and described water jet device (902) is installed on driving (901) upper energy following vehicle and moves.
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 6 heating, it is characterized in that: described propulsion system (6) includes carrying platform (601), screw propeller (602) and motor (603), described carrying platform (601) is fixed on natural gas collecting hood (1) outer middle side part, and motor (603) connects screw propeller (622) and is arranged on carrying platform (601).
- The sea-bottom natural gas collection device of external buoyancy tank helical pipe the most as claimed in claim 8 heating, it is characterized in that: in described natural gas collecting hood (1), be provided with monitoring system (10), described monitoring system (10) includes temperature and pressure monitoring device and shell stress monitoring device, it is internal that described temperature and pressure monitoring device are arranged on top platform (102), and the housing (101) that some shell stress monitoring devices are arranged on natural gas collecting hood (1) is outside；Described monitoring system (10), propulsion system (6), pressure regulating system (3), anchoring system (8), agitation system (9), humidity control system (4) and Auto-regulating System of Density of Heavy Medium system (2) are connected to control centre by cable respectively, and described control centre is located on lash ship (5).
- 10. the sea bed gas hydrate acquisition method of the sea-bottom natural gas collection device of the external buoyancy tank helical pipe heating that a kind uses described in one of claim 1 to 9, it is characterised in that: it is realized by following steps:Step 1, lash ship (5) are if transport dry gas collecting hood (1) is to specifying sea-bed area, control Auto-regulating System of Density of Heavy Medium system (2) water-filling in buoyant module (201), control natural gas collecting hood (1) to transfer to during close to precalculated position, start propulsion system (6) and natural gas collecting hood (1) is carried out fine position；After step 2, natural gas collecting hood (1) reach precalculated position, control ring baffle (103) and insert seabed mud bed, start anchoring system (5) and make screw rod (801) stretch in the mud bed of seabed, natural gas collecting hood (1) is fixed and seals；Step 3, unlatching pressure regulating system (3), discharge the sea water that natural gas collecting hood (1) is internal, make natural gas collecting hood (1) be internally formed negative pressure and promote decomposition of hydrate, gas hydrates are collected by gas production pipe (12) and are processed to natural gas storage device (7) and store, monitor system (10) monitoring natural gas collecting hood (1) internal pressure change simultaneously, adjust the duty of pressure regulating system (3) in real time, it is ensured that the internal pressure of natural gas collecting hood (1) is stable；Step 4, monitoring system (10) monitoring natural gas collecting hood (1) internal temperature values, and detection temperature value is compared with setting value, if temperature value is relatively low, start-up temperature regulation system (4), apparatus of oxygen supply (402) produces oxygen, by ventilation channel (401), oxygen is supplied to heater (403), control oxygen with natural gas in heater (403) react, and produce the internal temperature of heat raising natural gas collecting hood (1), when temperature value reaches preset value, control apparatus of oxygen supply (402) and stop producing oxygen；Step 5, when the gas hydrates in same appointment sea-bed area gathered after certain time, start agitation system (9), control water jet device (902) alignment seabed mud bed and also spray High-Pressure Water, agitation seabed mud bed promotes deep layer decomposition of hydrate；Step 6, when specify sea-bed area natural gas extraction complete after, Auto-regulating System of Density of Heavy Medium system (2) is by supplying to buoyant module (201), reduce the global density of natural gas collecting hood (1), anchoring system (8) releases fixing, natural gas collecting hood (1) upper and lift-off from the contacting of seabed mud bed, propulsion system (6) promotes natural gas collecting hood (1) to move to next one territory to be exploited, and repeats step 2 to step 5.
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