CN218716702U - Device for preventing natural gas hydrate from regenerating and blocking exploitation system - Google Patents
Device for preventing natural gas hydrate from regenerating and blocking exploitation system Download PDFInfo
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- CN218716702U CN218716702U CN202220214907.8U CN202220214907U CN218716702U CN 218716702 U CN218716702 U CN 218716702U CN 202220214907 U CN202220214907 U CN 202220214907U CN 218716702 U CN218716702 U CN 218716702U
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Abstract
The utility model provides a prevent that natural gas hydrate from regenerating and blocking up device of exploitation system, including non-powered exploitation device and collection device, be provided with air water transportation pipeline between non-powered exploitation device and the collection device, the inside heat-conduction device that is provided with of non-powered exploitation device, heat-conduction device is including the exothermic section, linking section and the heat absorption section that set gradually from top to bottom. The utility model relates to a rationally, simple structure utilizes geothermal gradient characteristic, conducts the energy of reservoir downside stratum to the pipe wall fast, can realize continuously transferring heat certainly, with heat conduction to pipe wall, prevents that the hydrate of secondary formation from leading to the fact the jam at the pipe wall, need not external energy and pours into, greatly reduces use cost.
Description
Technical Field
The utility model relates to a prevent that natural gas hydrate from regenerating device of jam exploitation system.
Background
The natural gas hydrate, commonly called 'combustible ice', mainly comprises a cage-shaped solid compound formed by CH4 and water at low temperature and high pressure, the storage amount is large, the carbon content stored in the natural gas hydrate is about twice of the sum of the carbon content in all fossil fuels (including coal, petroleum and natural gas) which are proved at present, and more than 90 percent of the carbon content is in seabed clay silt or silt sediment. Under the conditions that the current international environmental energy is in short supply and domestic large-scale power failure even occurs for a plurality of times, the energy problem is solved.
At present, the common exploitation modes of natural gas hydrate mainly include a thermal shock method (heating method), a depressurization method, a chemical inhibitor method, a CO 2-CH 4 replacement method, a steam swallowing and spitting method and the like, and the combined application of the methods. The depressurization method is most widely applied, has the greatest advantages of high decomposition speed, no need of continuous excitation, various realization forms, such as a vertical well, a horizontal well, a multi-branch horizontal well and the like, but when the depressurization method is transported in the production process and passes through a low-temperature area, hydrates in a transportation pipeline are easy to generate secondarily, so that blockage is caused, and the gas production efficiency is reduced.
The solution to the above problem comprises: (1) an electromagnetic heating method; the method has the advantages that the transmitting antenna is arranged on the sea surface of the transmission pipeline of the mining device, the heating antenna is arranged on the outer side of the position easy to block, energy is transmitted in the modes of microwaves, electromagnetic waves, radio frequency and the like, the pipe wall is heated, and secondary generated hydrates are decomposed; (2) inhibitor method; the method uses special chemical substances to inhibit the secondary formation of hydrates by injecting thermodynamic or kinetic inhibitors into the transport pipeline, has inevitable harm to the environment and must interrupt the production process when being implemented.
SUMMERY OF THE UTILITY MODEL
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is to provide a prevent that natural gas hydrate from regenerating the device that blocks up exploitation system, realize continuously transferring heat certainly, with heat conduction to pipe wall, prevent that the hydrate of secondary generation from leading to the fact the jam at the pipe wall, need not external energy and pours into, greatly reduce use cost.
The utility model discloses a constitute like this, it includes non-powered mining device and collection device, be provided with air water transport pipe between non-powered mining device and the collection device, the inside heat-conduction device that is provided with of non-powered mining device, heat-conduction device is including the exothermic section, linking section and the heat absorption section that set gradually from top to bottom.
Further, the gas-water conveying pipeline comprises an outer gas conveying pipeline and an outer water conveying pipeline, an inner gas conveying pipeline connected with the outer gas conveying pipeline and an inner water conveying pipeline connected with the outer water conveying pipeline are arranged inside the unpowered mining device, and a mining power device is arranged below the inner water conveying pipeline.
Furthermore, the heat conduction device comprises a plurality of seamless steel pipes and a liquid ammonia layer positioned in the seamless steel pipes, the plurality of seamless steel pipes are fixed by a fixing device, the heat release section is positioned at the upper part of the seamless steel pipes, the connection section is positioned at the middle part of the seamless steel pipes, and the heat absorption section is positioned at the lower part of the seamless steel pipes.
Furthermore, the unpowered mining device comprises a tail component, an upper half part of a middle component, a lower half part of the middle component and a head component which are sequentially arranged from top to bottom, wherein two sides of the upper half part of the middle component are provided with side wing parts.
Further, an anchor cable control device is arranged on the side portion of the collecting device, and an anchor cable is arranged between the anchor cable control device and the unpowered mining device.
Compared with the prior art, the utility model discloses following beneficial effect has: this device simple structure, reasonable in design can realize lasting self-transferring heat, with heat conduction to pipe wall, prevents that the hydrate of secondary generation from attaching to the pipe wall and causing the jam, need not external energy and pours into, greatly reduces use cost. Meanwhile, on the basis of a depressurization method, the exploitation technology is combined with a device for preventing the natural gas hydrate from regenerating and blocking an exploitation system, so that the seabed heat is utilized at low cost, the natural gas hydrate is prevented from regenerating and blocking the exploitation system, and the exploitation efficiency is improved. The contained heat conduction device can be used in different mining modes by changing the shape; and the heat-conducting material has the advantages of high heat-conducting property, no need of an external power source, no need of daily maintenance and the like, so that the heat-conducting material has excellent adaptability to different engineering environments.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a non-powered mining device according to embodiment 1 of the present invention;
fig. 3 is a partial sectional view of a non-powered mining device according to embodiment 1 of the present invention;
fig. 4 is a schematic structural view of a marine riser and a non-powered mining device according to embodiment 2 of the present invention;
in the figure: a-a natural gas hydrate overburden; b-a natural gas hydrate reservoir; a C-gas hydrate reservoir underlying free gas layer; 1-anchor cable, 2-unpowered mining device, 21-tail component, 22-flank, 23-middle component upper half, 24-middle component lower half, 25-head component, 26-internal gas transmission pipeline, 27-internal water transmission pipeline, 3-anchor cable control device, 4-gas water transmission pipeline, 41-external gas transmission pipeline, 42-external gas transmission pipeline, 5-collecting device, 6-mining power device, 7-heat conduction device, 71-heat release section, 72-joining section, 73-heat absorption section, 8-water insulation pipe and 9-fixing device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1: referring to the attached drawings 1-3, the device for preventing the natural gas hydrate from being regenerated to block the exploitation system comprises a non-powered exploitation device 2 and a collection device 5, wherein a gas-water conveying pipeline 4 is arranged between the non-powered exploitation device and the collection device, and a heat conduction device 7 is arranged in the non-powered exploitation device.
The heat release section of the heat conduction device is arranged in the natural gas hydrate exploitation system, and the heat absorption section is arranged in a relatively high-temperature area at the lower part of a natural gas hydrate reservoir;
the heat conduction device is a gas-liquid two-phase convection circulation heat conduction system, which is formed by injecting working media into a closed vacuum cavity and realizes heat transfer by means of phase change of working media in the heat conduction device 7, the heat conduction device is divided into a heat release section 71, a connection section 72 and a heat absorption section 73, the heat release section is positioned in a stratum needing energy supplement, and the heat absorption section is positioned in a stratum with relatively higher temperature; liquid ammonia can be boiled and changed into gaseous ammonia to absorb heat when the lower part of the liquid ammonia is contacted with a high-temperature stratum, the gaseous ammonia moves upwards, and the gaseous ammonia is condensed and releases heat in the upper low-temperature environment and is changed into liquid ammonia again to flow back to the lower part of the liquid ammonia.
The gas-water conveying pipeline 4 comprises an outer gas conveying pipeline 41 and an outer water conveying pipeline 42, an inner gas conveying pipeline 26 connected with the outer gas conveying pipeline and an inner water conveying pipeline 27 connected with the outer water conveying pipeline are arranged in the unpowered mining device, and a mining power device 6 is arranged below the inner water conveying pipeline.
In this embodiment, the heat conduction device comprises a plurality of seamless steel pipes and a liquid ammonia layer located in the seamless steel pipes, and the plurality of seamless steel pipes are fixed by a fixing device 9. The fixing device is ring-shaped.
The heat release section is positioned at the upper part of the seamless steel tube, the connection section is positioned at the middle part of the seamless steel tube, and the heat absorption section is positioned at the lower part of the seamless steel tube.
The heat release section is an annular net type formed by a plurality of seamless steel pipes and a fixing device, tightly surrounds the outer side of an inner gas transmission pipeline of the unpowered mining device, and is outwards bent through a connecting section in the middle, so that the heat absorption section at the lower part is close to the pipe wall at the inner side of the unpowered mining device, the heat absorption effect is better, and a certain distance is reserved from the pipe wall edge of the heat absorption section, so that the damage caused when the unpowered mining device impacts to enter a hydrate reservoir stratum is prevented; when the device works, the heat absorption section at the lower part absorbs heat at a relatively high temperature zone, and the heat release section at the upper part condenses and releases heat in a low-temperature environment, so that secondary generation of hydrates is avoided.
The hydrate reservoir includes a gas hydrate overburden a, a gas hydrate reservoir B, and a gas hydrate reservoir underburden free gas layer C.
In this embodiment, the unpowered mining device comprises, in order from top to bottom, a tail member 21, an upper mid-member half 23, a lower mid-member half 24, and a head member 25, the upper mid-member half being flanked by wing portions 22.
In this embodiment the side of the collecting device is provided with an anchor line control device 3, and an anchor line 1 is arranged between the anchor line control device and the non-powered mining device.
In this embodiment, in operation: (1) Selecting a mining area according to the early-stage exploration condition, and arranging an offshore construction operation platform or using a construction ship; (2) Under the environment suitable condition, the unpowered mining device is placed below a construction operation platform or a construction ship for a certain distance, no initial speed release and free falling process exist, and the unpowered mining device penetrates into the designated mining area; (3) After the unpowered mining device is stabilized, operation is started, a negative pressure area is formed around the unpowered mining device, the natural gas hydrate begins to decompose, and under the action of the internal and external pressure differences, the natural gas is upwards collected into the collecting device through the gas-water conveying pipeline; (4) Along with the continuous process of exploitation, the temperature around the unpowered exploitation device gradually decreases, the heat conduction device starts to be started under the influence of the gradient of the heat ground temperature, the phase change of the internal working medium is utilized, the heat at the lower part of the exploitation area is transferred to the pipe wall of the transportation pipeline, the natural gas hydrate is prevented from being generated again, and then the exploitation system is blocked.
Example 2: on the basis of the embodiment 1, as shown in fig. 4, in this embodiment, the heat conduction device may also be applied to conventional well drilling type mining, the heat conduction device for conventional well drilling type mining includes a plurality of sealed vacuum chambers and a fixing device 9, the sealed vacuum chambers are provided with a heat release section, a connection section and a heat absorption section from top to bottom, the sealed vacuum chambers and the fixing device form an annular fence net type, the heat conduction device is fixed outside a suitable position of a well drilling riser 8, and enters along with the well drilling, after a well bore is completely built into a production well, the heat release section of the heat conduction device is located at a position where hydrates are likely to be secondarily generated in the production well, and the heat absorption section is located in a relatively high temperature region at the lower part of the production well, so that the effect of preventing the hydrates from being regenerated to cause blockage is optimal; when the device works, the lower part absorbs heat in a relatively high-temperature zone, and the upper part condenses in a low-temperature environment to release heat, so that the reformation of hydrate is prevented.
An application method of a device for preventing natural gas hydrate from regenerating and blocking a production system, which is suitable for traditional well type production, comprises the following steps:
(1) According to the early exploration condition, a mining area is selected, and an offshore construction operation platform or a construction ship is arranged and anchored.
(2) Drilling is carried out, and when the casing is lowered, the drilling riser and the heat conduction device enter together.
(3) And when the well drilling is finished, injecting a well completion fluid, filling the gap around the well drilling riser with the well completion fluid, and forming the annular fence by net-type wrapping.
(4) After the well is formed, when natural gas is mined, the heat conduction device starts to be started under the influence of the ground temperature gradient, the heat at the lower part of a mining area is transferred to the pipe wall of the conveying pipe by utilizing the phase change of the internal working medium, and natural gas hydrate is prevented from being generated again and attached to the pipe wall of the conveying pipe so as to block a mining system.
On the basis of a depressurization method, the exploitation technology is combined with a device for preventing the natural gas hydrate from regenerating and blocking an exploitation system, so that the submarine heat is utilized at low cost, the natural gas hydrate is prevented from regenerating and blocking the exploitation system, and the exploitation efficiency is improved. The contained heat conduction device can be used in different mining modes by changing the shape; and the heat-conducting material has the advantages of high heat-conducting property, no need of an external power source, no need of daily maintenance and the like, so that the heat-conducting material has excellent adaptability to different engineering environments.
In addition to other claims, if a numerical range is disclosed, the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (5)
1. The utility model provides a prevent that natural gas hydrate from regenerating and blocking up device of exploitation system which characterized in that, includes no powered exploitation device and collection device, be provided with air water transport pipeline between no powered exploitation device and the collection device, the inside heat transfer device that is provided with of no powered exploitation device, heat transfer device is including the exothermic section, linking section and the heat absorption section that from top to bottom set gradually.
2. The device for preventing the natural gas hydrate from being regenerated to block the exploitation system according to claim 1, wherein the gas-water conveying pipeline comprises an outer gas conveying pipeline and an outer water conveying pipeline, an inner gas conveying pipeline connected with the outer gas conveying pipeline and an inner water conveying pipeline connected with the outer water conveying pipeline are arranged inside the unpowered exploitation device, and an exploitation power device is arranged below the inner water conveying pipeline.
3. The apparatus according to claim 1, wherein the heat conduction device comprises a plurality of seamless steel pipes and a liquid ammonia layer inside the seamless steel pipes, the plurality of seamless steel pipes are fixed by a fixing device, the heat release section is located at the upper part of the seamless steel pipes, the connection section is located at the middle part of the seamless steel pipes, and the heat absorption section is located at the lower part of the seamless steel pipes.
4. The device for preventing natural gas hydrate from regenerating and blocking an exploitation system according to claim 1, wherein the unpowered exploitation device comprises a tail component, an upper middle component half, a lower middle component half and a head component which are arranged in sequence from top to bottom, and two sides of the upper middle component half are provided with side wings.
5. The device for preventing natural gas hydrate from regenerating and blocking the exploitation system according to claim 1, wherein an anchor cable control device is arranged on the side of the collection device, and an anchor cable is arranged between the anchor cable control device and the unpowered exploitation device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220214907.8U CN218716702U (en) | 2022-01-26 | 2022-01-26 | Device for preventing natural gas hydrate from regenerating and blocking exploitation system |
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| CN202220214907.8U CN218716702U (en) | 2022-01-26 | 2022-01-26 | Device for preventing natural gas hydrate from regenerating and blocking exploitation system |
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| CN218716702U true CN218716702U (en) | 2023-03-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320241A (en) * | 2022-01-26 | 2022-04-12 | 福州大学 | Device for preventing natural gas hydrate from being regenerated to block mining system and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320241A (en) * | 2022-01-26 | 2022-04-12 | 福州大学 | Device for preventing natural gas hydrate from being regenerated to block mining system and application method thereof |
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