CN218265877U - Natural gas hydrate exploitation area stratum energy compensation device - Google Patents
Natural gas hydrate exploitation area stratum energy compensation device Download PDFInfo
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- CN218265877U CN218265877U CN202220216062.6U CN202220216062U CN218265877U CN 218265877 U CN218265877 U CN 218265877U CN 202220216062 U CN202220216062 U CN 202220216062U CN 218265877 U CN218265877 U CN 218265877U
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Abstract
The utility model provides a regional stratum energy compensation arrangement of natural gas hydrate exploitation, include and be used for sinking to penetrating into compensation arrangement and high-pressure injection system from going into in the stratum, go into inside overflow passage that is provided with of compensation arrangement certainly, high-pressure injection system includes reservoir pressure device and the high-pressure tube that is used for providing injection power, the high-pressure tube upper end is connected with reservoir pressure device, the high-pressure tube lower extreme with overflow passage input port connection. The utility model relates to a rationally, simple structure need not to interrupt production or new well drilling during the use, and it is high to solve energy consumption among the traditional gas hydrate exploitation mode to and after exploitation a period, the exploitation region temperature descends, the problem that hydrate decomposition rate becomes slow.
Description
Technical Field
The utility model relates to a regional stratum energy compensation arrangement of natural gas hydrate exploitation.
Background
Natural gas hydrate, which is commonly called as 'combustible ice', mainly comprises a cage-shaped solid compound formed by CH4 and water at low temperature and high pressure. Preliminary estimates suggest that the reserves are on the order of millions of cubic meters, with over 90% being present in seabed clay silt or silt deposits. Under the international background of the shortage of current energy, the natural gas hydrate is taken as a novel energy with huge reserve and low pollution, and the problem of exploitation and utilization is more and more important. The current common exploitation modes mainly comprise a thermal shock method (heating method), a depressurization method, a chemical inhibitor method and a CO-CH 4 displacement method, and the combined application of the methods.
The specific implementation mode of the heat shock method mainly comprises the following steps: 1) The heat injection method is characterized in that heat is transmitted to a mining area by surface layer hot seawater, steam, hot brine or other hot fluids, and has the main defects of serious transportation loss and low efficiency due to long transmission distance; 2) In the combined deep-sea geothermal exploitation technology, CO2 or low-temperature seawater is injected into a high-temperature rock stratum with geothermal energy sources through a pump, after heat is extracted, the high-temperature seawater returns to a hydrate reservoir stratum through a sleeve to provide heat, but deep seabed drilling and seismic exploration are required, so that the cost is sharply increased, and in addition, the distribution range of the geothermal energy sources is limited; 3) In the in-situ heat supply method, calcium oxide (CaO) powder is injected into a natural gas hydrate reservoir and reacts with water to release heat so as to provide decomposition heat of the natural gas hydrate, but calcium hydroxide (CaOH) which is a product of the CaO powder can have negative effects on the environment, and an effective method for injecting a solid substance into the reservoir in a large range at present is not available; 4) The electric energy drives the related hydrate thermal excitation technology, a hydrate reservoir is heated in the modes of microwave, electromagnetic wave, radio frequency and the like, but the heating effect is poor due to the fact that the resistivity of the reservoir is high; the main purpose of the thermal shock method is to directly transfer heat to the natural gas hydrate reservoir, so that the temperature of the hydrate reservoir is integrally raised, the hydrate is promoted to shift on a phase curve, and the natural gas is obtained through decomposition. However, due to the low thermal conductivity of the hydrate reservoir, the heating is difficult, and due to the low porosity, the clay silt or sludge sediment around the hydrate reservoir inevitably absorbs huge heat during heating, so that huge energy waste is caused. The improved multi-horizontal well hot water injection method based on the various heat shock methods can improve the gas production efficiency, but the implementation cost is higher.
In the depressurization exploitation, because the natural gas hydrate is decomposed and absorbs energy, the temperature of an exploitation area is reduced after exploitation for a period of time, and further the hydrate decomposition efficiency is reduced.
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 natural gas hydrate exploits regional stratum energy compensation device, carries out energy compensation to natural gas hydrate reservoir temperature decline area, improves exploitation efficiency.
The utility model discloses a constitute like this, it includes and is used for penetrating through to the stratum from going into compensation arrangement and high-pressure injection system, from going into inside being provided with of compensation arrangement and overflowing the passageway, high-pressure injection system is including reservoir pressure device and the high-pressure tube that is used for providing injection power, the high-pressure tube upper end is connected with reservoir pressure device, the high-pressure tube lower extreme with overflow passageway input port connection.
Furthermore, the outside of the self-entering compensation device is provided with a heat conduction system, and the heat conduction system comprises a seamless steel pipe and a liquid ammonia layer arranged at the inner lower part of the seamless steel pipe.
Furthermore, the self-entering compensation device comprises a tail component, a middle component and a head component which are sequentially arranged from top to bottom, and side wings are arranged on two sides of the middle component.
Furthermore, the flow passage comprises a vertical passage and a plurality of transverse passages, and the output ends of the transverse passages are provided with liquid outlets.
Furthermore, a high-pressure pipe head connecting device is arranged above the middle component and used for connecting the lower end of the high-pressure pipe with the overflowing channel.
Furthermore, an anchor cable control device is arranged on the side of the high-pressure injection system, and the anchor cable control device is connected with the self-entering compensation device through a suspended anchor cable.
Compared with the prior art, the utility model discloses following beneficial effect has: (1) The traditional method carries out heat injection by drilling a new shaft, so that the cost is higher; the self-entering compensation device can be injected into the stratum of the natural gas hydrate exploitation area by means of impact, does not need external energy, can be recycled, and is low in cost; (2) In the traditional method, a heat source is injected through an original production well, the seepage path reaching a temperature reduction area is long, and production needs to be suspended; the method can directly inject a heat source into the temperature reduction area; (3) The device can also utilize the ground temperature gradient characteristic to quickly conduct the energy of the stratum at the lower side of the reservoir to the mining area through the high-efficiency heat conduction system, and further compensate the energy loss caused by the heat absorption of the hydrate decomposition.
Drawings
FIG. 1 is a schematic diagram of the operation of the embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a self-entering compensation device according to an embodiment of the present invention;
FIG. 3 is a vertical cross-sectional view of an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an embodiment of the invention;
fig. 5 is a diagram of a heat transfer system according to an embodiment of the present invention.
In the figure: a-a natural gas hydrate reservoir; b-natural gas hydrate reservoir underburden; 1-heat conduction system, 2-self-entering compensation device, 21-tail component, 211-high-pressure pipe head connecting device, 22-middle component, 23-head component, 24-side wing, 3-high-pressure injection system, 31-reservoir pressurizing device, 32-high-pressure pipe, 4-hanging anchor cable, 5-anchor cable control device, 6-overflowing channel, 61-vertical channel, 62-horizontal channel and 7-liquid outlet.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b): referring to the attached drawings 1-5, the stratum energy compensation device for the natural gas hydrate exploitation area comprises a self-entering compensation device 2 and a high-pressure injection system 3, wherein the self-entering compensation device is similar to a torpedo anchor in appearance, an overflow channel 6 is arranged inside the self-entering compensation device, the high-pressure injection system comprises a storage pressurizing device 31 and a high-pressure pipe 32, the storage pressurizing device is used for providing injection power, the upper end of the high-pressure pipe is connected with the storage pressurizing device, the lower end of the high-pressure pipe is connected with an input port of the overflow channel, and hot water is injected into a region with reduced reservoir temperature through the high-pressure pipe, the overflow channel and a liquid outlet to perform energy compensation on the region.
The self-entering compensation device is released in seawater, obtains higher speed through self gravity, and simultaneously drives the lower part of the high-pressure pipe to impact and enter the temperature-reduced zone layer.
The reservoir includes a gas hydrate reservoir a and a gas hydrate reservoir underburden B.
The hot water used in the high-pressure injection system can be sea surface hot water or a water source heated by solar energy or hot water produced by physical and chemical methods.
In this embodiment, a plurality of heat conduction systems 1 are circumferentially arranged on the outer side of the self-entering compensation device along the central position of the self-entering compensation device, and each heat conduction system comprises a seamless steel pipe and a liquid ammonia layer arranged on the inner lower part of the seamless steel pipe.
The heat conduction system is a gas-liquid two-phase convection circulation heat transfer device, the upper part of the seamless steel pipe is positioned in a stratum needing energy supplement, and the lower part of the seamless steel pipe is positioned in a stratum with relatively high 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.
Liquid ammonia has different boiling points under different pressures, seals seamless steel pipe internal initial pressure according to the design, and adaptable different natural gas hydrate exploitation environment for utilize the ability of ground temperature gradient heat transfer to reach the best effect.
In the present embodiment, the self-entering compensation device 2 comprises a tail member 21, a middle member 22 and a head member 23 which are arranged in sequence from top to bottom, and lateral wings 24 are arranged on two sides of the middle member. The lower part of the head component is a sharp part.
In this embodiment, the flow passage 6 includes a vertical passage 61 and a plurality of horizontal passages 62, and the output ends of the horizontal passages are provided with liquid outlets; the vertical channel and the plurality of transverse channels are specifically arranged inside the middle member.
In this embodiment, a high-pressure pipe head connecting device 211 is disposed above the middle member, and the high-pressure pipe head connecting device is located inside the head member to connect the lower end of the high-pressure pipe with the flow passage.
In the embodiment, the side part of the high-pressure injection system is provided with an anchor cable control device 5, and the anchor cable control device is connected with a self-entering compensation device through a suspension anchor cable 4.
In the embodiment, the lubricating coating is coated on the outer side of the self-entering compensation device, so that the abrasion resistance and the self-lubricating capability can be effectively improved, the overall performance of the self-entering compensation device can be improved, seawater corrosion is avoided, and the service life is prolonged; preferably, the coating outside the self-entering compensation device is a nickel-based mixed particle composite coating.
In this embodiment, in operation:
1) After the exploitation is carried out to a certain degree, an area with a large formation temperature drop is selected as a working area according to exploitation requirements.
2) The self-entering compensation device is released in the sea at a certain height above a working area through a construction ship or a hoisting system on an original construction operation platform, and the self-entering compensation device mainly depends on gravity to generate a high speed in the falling process, breaks a reservoir through a sharp-pointed head and sinks into the reservoir.
3) After entering the stratum from the self-entering compensation device and being stable, the reservoir pressurizing device of the high-pressure injection system is used for pressurizing, hot water is injected into the stratum with reduced temperature from the liquid outlet through the high-pressure pipe and the overflowing pipeline, and the energy loss of the reservoir caused by the exploitation of the hydrate is compensated.
4) And after the mining operation is finished, the anchor cable control device is used for drawing and recovering the self-entering compensation device for repeated utilization.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and 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 a bolt or screw connection) can also be 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.
It should be finally noted that the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; 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 (6)
1. The stratum energy compensation device is characterized by comprising a self-entering compensation device and a high-pressure injection system, wherein the self-entering compensation device and the high-pressure injection system are used for penetrating into a stratum in a sinking mode, an overflowing channel is arranged inside the self-entering compensation device, the high-pressure injection system comprises a storage pressurizing device and a high-pressure pipe, the storage pressurizing device is used for providing injection power, the upper end of the high-pressure pipe is connected with the storage pressurizing device, and the lower end of the high-pressure pipe is connected with an input port of the overflowing channel.
2. The device for compensating the stratum energy in the natural gas hydrate production area according to claim 1, wherein a heat conduction system is arranged on the outer side of the self-entering compensation device, and the heat conduction system comprises a seamless steel pipe and a liquid ammonia layer arranged on the inner lower part of the seamless steel pipe.
3. The device for compensating the energy of the stratum of the natural gas hydrate exploitation region according to claim 1, wherein the self-entering compensation device comprises a tail member, a middle member and a head member which are arranged from top to bottom in sequence, and side wings are arranged on two sides of the middle member.
4. The device for compensating the energy of the stratum of the natural gas hydrate production area according to claim 3, wherein the overflowing channel comprises a vertical channel and a plurality of transverse channels, and a liquid outlet is formed in the output end of each transverse channel.
5. The device for compensating the formation energy in the natural gas hydrate exploitation region according to claim 3, wherein a high-pressure pipe head connecting device is arranged above the middle member and used for connecting the lower end of the high-pressure pipe with the overflowing passage.
6. The device for compensating the stratum energy in the natural gas hydrate exploitation region according to claim 1, wherein an anchor cable control device is arranged on the side of the high-pressure injection system, and the anchor cable control device is connected with the self-entering compensation device through a hanging anchor cable.
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| CN202220216062.6U CN218265877U (en) | 2022-01-26 | 2022-01-26 | Natural gas hydrate exploitation area stratum energy compensation device |
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| CN202220216062.6U CN218265877U (en) | 2022-01-26 | 2022-01-26 | Natural gas hydrate exploitation area stratum energy compensation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320242A (en) * | 2022-01-26 | 2022-04-12 | 福州大学 | Natural gas hydrate exploitation area stratum energy compensation device and application method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114320242A (en) * | 2022-01-26 | 2022-04-12 | 福州大学 | Natural gas hydrate exploitation area stratum energy compensation device and application method thereof |
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