CN113294125B - Gas lift exploitation device for seabed natural gas hydrate - Google Patents
Gas lift exploitation device for seabed natural gas hydrate Download PDFInfo
- Publication number
- CN113294125B CN113294125B CN202110454755.9A CN202110454755A CN113294125B CN 113294125 B CN113294125 B CN 113294125B CN 202110454755 A CN202110454755 A CN 202110454755A CN 113294125 B CN113294125 B CN 113294125B
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- gas
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- injection
- combustion chamber
- inner tube
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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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
- E21B43/243—Combustion in situ
Abstract
The invention discloses a gas lift exploitation device for seabed natural gas hydrate, which comprises a gas production inner tube which extends into the seabed for gas production, wherein a conversion ring is sleeved on the outer side wall of the gas production inner tube, gas injection outer sleeves are arranged at the upper end and the lower end of the conversion ring, the gas injection outer sleeves are sleeved on the outer side wall of the gas production inner tube and are communicated with the gas production inner tube through a one-way gas injection assembly, an annular combustion chamber is sleeved on the outer side wall of the top of the gas production inner tube, and a plurality of gas mixers are arranged in the combustion chamber. The invention uses local materials and utilizes the natural gas hydrate from mining to directly inject oxygen to burn on the combustor in the combustion chamber, a large amount of heat energy can be generated in the burning process, and product water and carbon dioxide gas are generated, the volume of the gas after burning is increased to form pressure, and the gas is injected into the mining inner tube again through the gas injection tube, the temperature leads the solid combustible ice in the mining inner tube to be gradually gasified, thereby increasing the pressure in the mining inner tube again, and obviously improving the yield of the natural gas.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a gas lift exploitation device for seabed natural gas hydrate.
Background
Natural gas hydrates refer to crystalline substances formed when natural gas (the main component is methane) and water are mixed under medium-high pressure and low temperature conditions, and the natural gas hydrates are often called combustible ice, gas ice, solid gas, methane hydrates, solid gas, frozen methane and the like. When stratum energy can not lift liquid to the ground or the production requirement can not be met, high-pressure gas (natural gas, N2 and CO 2) is artificially injected into the well, the flowing pressure gradient (density of gas-liquid mixture) in the lifting pipe is reduced by the gas, and the energy of the gas is utilized to lift the liquid; the gas lift oil extraction principle is an oil extraction mode that high-pressure gas injected into a well from the ground is mixed with oil layer produced fluid in a well bore, the density of mixed liquid in the well bore is reduced by utilizing the expansion of the gas, and crude oil flowing into the well is lifted to the ground; the gas lift oil extraction is based on the principle of a U-shaped pipe, high-pressure gas is injected into an oil sleeve annulus (reverse lift) or an oil pipe (forward lift) through the ground to be mixed with formation fluid, and the density of a liquid column and the back pressure (bottom hole flowing pressure) to the bottom hole are reduced, so that the yield of an oil well is improved;
in the process of exploiting the seabed natural gas hydrate, when the pressure is insufficient, high-pressure gas needs to be filled into the seabed or the temperature inside the pipeline needs to be raised, so that the exploitation of the natural gas hydrate in the pipeline is realized.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a seabed natural gas hydrate gas lift exploitation device which adopts local materials, utilizes the exploited natural gas hydrate to directly inject oxygen into a combustor in a combustion chamber for combustion, generates a large amount of heat energy in the combustion process, generates product water and carbon dioxide gas, increases the intermolecular interval among the products to increase the volume of the combusted gas to form pressure due to the increase of the temperature, injects the pressure into an exploitation inner tube through a gas injection tube again, gradually gasifies solid combustible ice in the exploitation inner tube due to the temperature, and further increases the pressure in the exploitation inner tube, so that the pressure in the exploitation inner tube is remarkably increased, and the yield of natural gas is remarkably increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas lift exploitation device for seabed natural gas hydrate comprises a gas production inner pipe which extends into seabed gas production, the top of the gas production inner pipe is connected with a collecting pipe, the outer side wall of the gas production inner pipe is sleeved with a conversion ring, the upper end and the lower end of the conversion ring are respectively provided with a gas injection outer sleeve, the gas injection outer sleeve is sleeved on the outer side wall of the gas production inner pipe and is communicated with the gas production inner pipe through a one-way gas injection assembly, the outer side wall of the top of the gas production inner pipe is sleeved with an annular combustion chamber, a collection chassis is arranged in the combustion chamber, the collection chassis is provided with a plurality of collection ports which penetrate through the side wall of the combustion chamber, the conversion ring is provided with a plurality of injection pipes which are vertically arranged, the top of each injection pipe is connected with the collection ports, the injection pipes are provided with injection one-way valves, the outer side wall of the combustion chamber is provided with a floating ring which is filled with gas, and a plurality of gas mixers are arranged in the combustion chamber, the gas mixer is connected with oxygen conveyor, the gas mixer top is provided with combustion mechanism, the gas mixer passes through the circulation pipe fitting and is connected with the change-over ring, the circulation pipe fitting includes and is connected with the extraction pipe with the gas mixer, the extraction pipe runs through combustion chamber and change-over ring lateral wall in proper order to with be located the change-over intra-annular adopt the gas inner tube intercommunication, be provided with the extraction check valve on the extraction pipe.
Preferably, the combustion mechanism comprises a combustion disc arranged in the combustion chamber, a combustor is arranged on the combustion disc, the combustor is arranged in an arc shape, and a piezoelectric electronic ignition device is arranged on the combustion disc.
Preferably, the oxygen delivery device comprises a gas delivery ring arranged on the outer side wall of the combustion chamber, the gas mixer is communicated with the gas delivery ring through a branch pipe, and the gas delivery ring is connected with an oxygen generation device through a delivery pipe.
Preferably, one-way gas injection subassembly is including seting up the installing port on being located the inside gas production inner tube lateral wall of gas injection overcoat pipe, be provided with one-way gas injection pipe in the installing port, one-way gas injection intraductal wall is provided with and blocks the pipe, block and seted up spherical sealing mouth on the pipe, one-way gas injection pipe is connected with the ball sealer through the subassembly of contradicting.
Preferably, conflict subassembly includes the conflict dish through a plurality of branches and one-way gas injection pipe inner wall connection, the conflict dish passes through slide bar and ball sealer, fixedly connected with spacing ring on the slide bar, the spacing ring is established sealing spring and conflict dish on the slide bar lateral wall through the cover and is connected.
Preferably, a pressurizing injection pipe is arranged on the inner wall of the combustion chamber, and a pressurizing device is connected to the pressurizing injection pipe.
Compared with the prior art, the invention has the beneficial effects that:
this device adopts local materials, the natural gas hydrate that comes in the exploitation directly injects into oxygen and burns on the combustor in the combustion chamber, can produce a large amount of heat energy among the combustion process, and produce product water and carbon dioxide gas, and the rising of temperature can make the intermolecular intermittent type increase between the product cause the gas volume increase formation pressure after the burning, and in injecting the exploitation inner tube again through the gas injection pipe, the temperature makes the flammable ice of solid that is in the gas exploitation inner tube by gradual gasification, thereby promote the pressure in the gas exploitation inner tube once more, thereby show and improve the gas exploitation inner tube pressure, thereby show and improve the natural gas output.
Drawings
Fig. 1 is a schematic perspective view of a gas lift extraction device for natural gas hydrates at the sea bottom according to the present invention;
fig. 2 is a schematic front structural view of a gas lift extraction device for seabed natural gas hydrate according to the present invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
fig. 4 is a schematic sectional overhead structure diagram of a gas lift production device for natural gas hydrates at the sea bottom according to the present invention.
In the figure: the device comprises a gas production inner pipe 1, a collecting pipe 2, a conversion ring 3, a gas injection outer sleeve 4, a combustion chamber 5, a floating ring 6, a gas mixer 7, a combustion disc 8, a combustor 9, an extraction pipe 10, an extraction check valve 11, a collection chassis 12, a collection port 13, an injection pipe 14, an injection check valve 15, a gas transmission ring 16, a branch pipe 17, a delivery pipe 18, a one-way gas injection pipe 19, a blocking pipe 20, a sealing ball 21, a contact disc 22, a sliding rod 23, a spacing ring 24 and a pressurization injection pipe 25.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to fig. 1-4, a gas lift exploitation device for seabed natural gas hydrate comprises a gas production inner tube 1 which extends into seabed for gas production, a collecting tube 2 is connected with the top of the gas production inner tube 1, a conversion ring 3 is sleeved on the outer side wall of the gas production inner tube 1, gas injection outer tubes 4 are arranged at the upper end and the lower end of the conversion ring 3, the gas injection outer tubes 4 are sleeved on the outer side wall of the gas production inner tube 1 and are communicated with the gas production inner tube 1 through one-way gas injection components, further, the one-way gas injection components comprise mounting ports which are arranged on the side wall of the gas production inner tube 1 and are positioned in the gas injection outer tubes 4, one-way gas injection tubes 19 are arranged in the mounting ports, the inner walls of the one-way gas injection tubes 19 are provided with blocking tubes 20, spherical sealing ports are arranged on the blocking tubes 20, the one-way gas injection tubes 19 are connected with sealing balls 21 through abutting components, the abutting components comprise abutting discs 22 which are connected with the inner walls of the one-way gas injection tubes 19 through a plurality of supporting rods, the contact disc 22 is connected with the sealing ball 21 through a sliding rod 23, a limiting ring 24 is fixedly connected to the sliding rod 23, and the limiting ring 24 is connected with the contact disc 22 through a sealing spring sleeved on the outer side wall of the sliding rod 23; further benefits are taken: the backflow of gas can be effectively avoided, one-way circulation is realized, and the flow direction of the gas is ensured.
The outer side wall of the top of the gas production inner pipe 1 is sleeved with an annular combustion chamber 5, the outer side wall of the combustion chamber 5 is provided with a floating ring 6 filled with gas, the floating ring 6 can ensure that equipment can float on the sea, a plurality of gas mixers 7 are arranged in the combustion chamber 5, the gas mixers 7 are connected with an oxygen conveying device, further, the oxygen conveying device comprises gas conveying rings 16 arranged on the outer side wall of the combustion chamber 5, the gas mixers 7 are communicated with the gas conveying rings 16 through branch pipes 17, and the gas conveying rings 16 are connected with oxygen generation equipment through conveying pipes 18, wherein the oxygen generation equipment is the prior art and is not described in detail herein and belongs to external equipment; further benefits are taken: the whole process is controlled by electric control, thereby being convenient for operation.
The top of the gas mixer 7 is provided with a combustion mechanism, further, the combustion mechanism comprises a combustion disc 8 arranged in the combustion chamber 5, a combustor 9 is arranged on the combustion disc 8, the combustor 9 is arranged in an arc shape, and a piezoelectric electronic ignition device is arranged on the combustion disc 8; further benefits are taken: the whole process is controlled by electric control, thereby being convenient for operation.
The gas mixer 7 is connected with the conversion ring 3 through a circulating pipe fitting; furthermore, the circulating pipe fitting comprises an extraction pipe 10 connected with the gas mixer 7, the extraction pipe 10 sequentially penetrates through the side walls of the combustion chamber 5 and the conversion ring 3 and is communicated with the gas production inner pipe 1 positioned in the conversion ring 3, and an extraction check valve 11 is arranged on the extraction pipe 10; furthermore, a collecting chassis 12 is arranged in the combustion chamber 5, a plurality of collecting ports 13 penetrating through the side wall of the combustion chamber 5 are formed in the collecting chassis 12, a plurality of injection pipes 14 which are vertically arranged are arranged on the conversion ring 3, the tops of the injection pipes 14 are connected with the collecting ports 13, injection check valves 15 are arranged on the injection pipes 14, a pressurizing injection pipe 25 is arranged on the inner wall of the combustion chamber 5, and the pressurizing injection pipe 25 is connected with pressurizing equipment; further benefits are taken: when the pressure is insufficient, the internal pressure can be increased through the prior art, and the gas lift oil extraction is carried out.
When the pressure in the gas production inner pipe 1 is insufficient, a valve on a collecting pipe 2 is closed, combustible ice gas in the gas production inner pipe 1 is upwards extracted from an extraction pipe 10 due to blockage above the gas production inner pipe 1, the combustible ice gas enters a gas mixer 7, is fully mixed with oxygen conveyed by a branch pipe 17 through a gas conveying ring 16 connected with an oxygen production device, is combusted through a combustor 9, generates a large amount of heat through combustion of the combustible ice, generates product water and carbon dioxide gas, the intermolecular interval among the products is increased due to the rise of the temperature, the gas and the water absorb the heat and are discharged through a collecting port 13 on a closed combustion chamber 5, and are injected into a gas injection outer sleeve 4 through an injection pipe 14, and the product gas and the water are injected into the gas production inner pipe 1 through a one-way gas injection pipe 19 arranged in the gas injection outer sleeve 4;
because the gaseous volume grow after the burning, the product gas of injecting through injection pipe 14 can be more than the gas of taking out through extraction tube 10 with water, and then causes the gas pressure in gas injection inner tube 1 to increase, and the product gas after the burning can carry a large amount of heat energy with water and flow back in gas production inner tube 1, make the solid combustible ice that is in gas production inner tube 1 by gasification gradually, thereby promote the pressure in gas production inner tube 1 once more, thereby show and improve gas production inner tube pressure, thereby show and improve the natural gas output.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The gas lift exploitation device for the seabed natural gas hydrate comprises a gas production inner pipe (1) which extends into seabed gas production, and is characterized in that the top of the gas production inner pipe (1) is connected with a collecting pipe (2), the outer side wall of the gas production inner pipe (1) is sleeved with a conversion ring (3), the upper end and the lower end of the conversion ring (3) are respectively provided with a gas injection outer sleeve (4), the gas injection outer sleeve (4) is sleeved on the outer side wall of the gas production inner pipe (1) and is communicated with the gas production inner pipe (1) through a one-way gas injection assembly, the outer side wall of the top of the gas production inner pipe (1) is sleeved with an annular combustion chamber (5), a collecting chassis (12) is arranged in the combustion chamber (5), a plurality of collecting ports (13) which penetrate through the side wall of the combustion chamber (5) are arranged on the collecting chassis (12), a plurality of injection pipes (14) which are vertically arranged are arranged on the conversion ring (3), injection pipe (14) top is connected with collection mouth (13), be provided with injection check valve (15) on injection pipe (14), combustion chamber (5) lateral wall is provided with floating ring (6) that is full of gas, be provided with a plurality of gas mixer (7) in combustion chamber (5), gas mixer (7) are connected with oxygen conveyor, gas mixer (7) top is provided with combustion mechanism, gas mixer (7) are connected with switching ring (3) through the circulation pipe fitting, the circulation pipe fitting includes and is connected with extraction pipe (10) with gas mixer (7), extraction pipe (10) run through combustion chamber (5) and switching ring (3) lateral wall in proper order to with be located switching ring (3) gas production inner tube (1) intercommunication, be provided with extraction check valve (11) on extraction pipe (10).
2. The gas lift exploitation device of a seabed natural gas hydrate according to claim 1, wherein the combustion mechanism comprises a combustion disc (8) arranged in the combustion chamber (5), the combustion disc (8) is provided with a burner (9), the burner (9) is arranged in an arc shape, and the combustion disc (8) is provided with a piezoelectric electronic ignition device.
3. The subsea natural gas hydrate gas lift mining device according to claim 1, characterized in that the oxygen conveying device comprises a gas conveying ring (16) arranged on the outer side wall of the combustion chamber (5), the gas mixer (7) is communicated with the gas conveying ring (16) through a branch pipe (17), and the gas conveying ring (16) is connected with an oxygen production device through a conveying pipe (18).
4. The gas lift exploitation device for the natural gas hydrate on the sea floor according to claim 1, wherein the one-way gas injection assembly comprises a mounting opening formed in a side wall of the gas production inner tube (1) inside the gas injection outer tube (4), a one-way gas injection tube (19) is arranged in the mounting opening, a blocking tube (20) is arranged on an inner wall of the one-way gas injection tube (19), a spherical sealing opening is formed in the blocking tube (20), and the one-way gas injection tube (19) is connected with a sealing ball (21) through the abutting assembly.
5. The gas lift exploitation device for the natural gas hydrate on the sea floor according to claim 4, wherein the abutting assembly comprises an abutting disc (22) connected with the inner wall of the one-way gas injection pipe (19) through a plurality of support rods, the abutting disc (22) is connected with the sealing ball (21) through a sliding rod (23), a limiting ring (24) is fixedly connected to the sliding rod (23), and the limiting ring (24) is connected with the abutting disc (22) through a sealing spring sleeved on the outer side wall of the sliding rod (23).
6. The gas lift exploitation device for natural gas hydrates on the sea floor according to claim 1, wherein a pressurized injection pipe (25) is arranged on the inner wall of the combustion chamber (5), and a pressurizing device is connected to the pressurized injection pipe (25).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110454755.9A CN113294125B (en) | 2021-04-26 | 2021-04-26 | Gas lift exploitation device for seabed natural gas hydrate |
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| CN202110454755.9A CN113294125B (en) | 2021-04-26 | 2021-04-26 | Gas lift exploitation device for seabed natural gas hydrate |
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| CN113294125B true CN113294125B (en) | 2022-05-27 |
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| CN113982545B (en) * | 2021-09-28 | 2023-07-28 | 普斐特油气工程(江苏)股份有限公司 | Safety lifting Wen Zhuqi valve for oil well |
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