CN214303789U - Sea area natural gas hydrate barrel type mining device - Google Patents
Sea area natural gas hydrate barrel type mining device Download PDFInfo
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- CN214303789U CN214303789U CN202023069593.7U CN202023069593U CN214303789U CN 214303789 U CN214303789 U CN 214303789U CN 202023069593 U CN202023069593 U CN 202023069593U CN 214303789 U CN214303789 U CN 214303789U
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Abstract
The utility model provides a sea area natural gas hydrate cartridge formula exploitation device, exploitation section of thick bamboo, water pump, sand control device and gas-liquid lifting system etc.. The invention realizes the sinking of the exploitation cylinder, the exploitation of the natural gas hydrate and the recovery of the exploitation cylinder on the premise of not drilling through the specially designed exploitation cylinder and the matching device thereof. The method fundamentally solves a series of problems of extremely high drilling and completion cost, easy collapse of a shaft caused by stratum instability, easy damage of a sand control structure under the action of stratum pressure and the like in the traditional drilling and exploiting method, can greatly reduce the exploitation cost of the natural gas hydrate, and has important significance for the commercial exploitation of the sea natural gas hydrate.
Description
Technical Field
The utility model relates to a sea area natural gas hydrate cartridge formula exploitation device.
Background
Natural gas hydrate (also known as combustible ice) is a green energy source. The carbon content of the natural gas hydrate which is researched and explored is 2 times of the sum of the carbon content of fossil energy (petroleum, natural gas and coal), most of the carbon content is stored in a sedimentary layer of an offshore continental shelf, and a small amount of the carbon content is stored in a plateau frozen soil area, so that the energy demand of human beings in the next 1000 years can be met. Therefore, it is considered to be a new energy source having a great potential to replace conventional energy sources such as petroleum, coal and natural gas.
The exploitation principle of the natural gas hydrate comprises the following steps: pressure reduction, heat shock, chemical agent displacement and solid state fluidization, and the combined application of the above single methods. At present, the depressurization method and the improvement scheme based on the depressurization method are generally considered to be the best way for realizing the industrialized trial production of the sea natural gas hydrate, and other methods are mainly used as auxiliary yield increasing measures or gas production stabilizing measures of the depressurization method.
The existing depressurization method is mainly realized by reducing the pressure in a shaft after drilling, such as a patent CN 107676058B-a method and a device for displacement exploitation of marine natural gas hydrate mortar, a CN 109763794B-method for depressurization and heating combined exploitation of a marine hydrate multi-branch horizontal well, a CN 101672177B-method for exploitation of seabed natural gas hydrate and the like. However, the decomposition of the natural gas hydrate around the shaft can cause the strength of a reservoir to be greatly reduced, a large amount of sand is produced in a stratum, the instability of the shaft is further caused, the continuous exploitation is difficult to realize, and the problem occurs in the trial exploitation of the natural gas hydrate in multiple sea areas at home and abroad. In addition, the value of produced natural gas is far from covering the drilling cost, so commercial production is not achieved at present.
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 the characteristics of sea area natural gas hydrate generally existing in clay matter silt sand or silt matter deposit, provides a low-cost step-down exploitation system and exploitation method that need not drill a well.
The utility model discloses a concrete implementation scheme is: a drum type exploitation device for sea area natural gas hydrate comprises an exploitation drum capable of sinking below the sea surface, a water pump, a sand prevention device and a gas-liquid lifting system; the mining barrel comprises a top plate and a barrel body extending from the lower part of the top plate to form a cylindrical structure with a closed upper side and an unclosed lower side; the water pump is fixed on the top plate and communicated with the inner cavity of the barrel body, and liquid in the mining barrel can be discharged outwards through the water pump to reduce the pressure in the mining barrel and control the mining barrel to sink in the stratum;
the sand prevention device is positioned at the bottom of the mining barrel, a cavity is formed between the sand prevention device and the mining barrel, and the cavity is cylindrical; the cavity is communicated with a water pipeline and a gas pipeline;
the gas-liquid lifting system comprises at least one lifting power device, wherein one end of the lifting power device is connected with the cavity, and the other end of the lifting power device is connected with or lifts liquid and/or gas in the cavity through the channel.
Further, one end of the water conveying pipeline is connected with the gas-liquid lifting system, and the other end of the water conveying pipeline extends to the outside of the collecting cylinder; one end of the gas transmission pipeline is connected with the cavity, and the other end of the gas transmission pipeline extends to the outside of the collecting cylinder so as to be convenient for collection; under the action of formation pressure and gravity, the liquid in the cavity moves downwards, and the gas-liquid lifting system presses the liquid in the cavity into the water conveying pipeline and lifts the liquid; the gas in the cavity moves upwards through the gas transmission pipeline; the lifting power device is an electric pump, and the electric pump is an electric submersible centrifugal pump, an electric submersible screw pump or a combination of the electric submersible centrifugal pump and the electric submersible screw pump.
Further, the sand control device is disc-shaped and covers the bottom side of the cavity. The upper surface and the lower surface of the sand control device are provided with one-way water permeable protective components which are tightly attached to the sand control device.
Further, the input end of the lifting power device is connected with a gas-liquid separation device.
Furthermore, a water-stop plate fixed on the top of the sand control device and vertical to the top is arranged in the cavity.
Further, the top of the mining barrel is provided with a hanging lug.
Further, a jet injection system is embedded in the mining cylinder; the jet injection system comprises an injection pump and jet ports distributed on the surface of the mining barrel, and a jet pipeline is communicated with the inside of each jet port; the injection pump injects water, hot seawater, carbon dioxide, or chemical inhibitors into the production area through the injection pipe to the injection port.
Compared with the prior art, the utility model discloses following beneficial effect has: the invention realizes the sinking of the exploitation cylinder, the exploitation of the natural gas hydrate and the recovery of the exploitation cylinder on the premise of not drilling through the specially designed exploitation cylinder and the matching device thereof. The method fundamentally solves a series of problems of extremely high drilling and completion cost, easy collapse of a shaft caused by stratum instability, easy damage of a sand control structure under the action of stratum pressure and the like in the traditional drilling and exploiting method, can greatly reduce the exploitation cost of the natural gas hydrate, and has important significance for the commercial exploitation of the sea natural gas hydrate.
Drawings
FIG. 1 is an overall schematic view of a marine natural gas hydrate drum mining installation according to the invention;
FIG. 2 is a schematic external view of a preferred embodiment of the mining apparatus of the present invention;
FIG. 3 is a schematic view of a preferred embodiment of a jet injection system according to the present invention;
in the figure: 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-a mining barrel; 11-a one-way water-permeable protective member; 13-water permeable opening and cover; 14-a water pump; 16-a water-stop sheet; 2-a sand control device; 21-a cavity; 22-water conveying pipeline; 23-a gas pipeline; 31-lifting power plant; 32-a gas-liquid separation device; 41-water conveying pipe; 42-gas transmission pipe; 54-a cable; 61-the tubing of the jet injection system; 62-the jet orifice of the jet injection system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 3, a marine natural gas hydrate cartridge type mining device includes: the device comprises a mining cylinder, a water pump, a sand prevention device, a gas-liquid lifting system, a water pipeline and a gas pipeline.
The mining cylinder is of a cylindrical structure with a closed upper side and an unclosed lower side and comprises a top plate and a cylinder body; the water pump, the sand prevention device and the gas-liquid lifting system are arranged on the mining cylinder; the water pump is fixed on the mining cylinder, the water pump is communicated with the inner cavity of the cylinder body, liquid in the mining cylinder is discharged outwards through the water pump, the pressure in the mining cylinder is reduced, and the mining cylinder is controlled to sink in the stratum;
the production cylinder carries the sand control device and the gas-liquid lifting system to enter a natural gas hydrate reservoir stratum and/or a natural gas hydrate and free gas mixing layer and/or a free natural gas layer.
In this embodiment, the production cartridge and the sand control device form a cavity, the sand control device allows liquids and/or gases to pass through and enter the cavity, and the sand control device uses a sand filter to filter silt; the cavity is provided with two channels, namely a water delivery channel and a gas delivery channel.
The gas-liquid lifting system comprises a lifting power device, and the lifting power device adopts an electric submersible centrifugal pump; one end of the gas-liquid lifting system is connected with the cavity, and the other end of the gas-liquid lifting system is connected with or passes through the channel to lift liquid and/or gas in the cavity; the pressure in the cavity can be reduced while the cavity is lifted, so that the pressure of surrounding strata is reduced, the decomposition of the natural gas hydrate is promoted, and water and natural gas formed by decomposition enter the cavity again through the sand control device under the action of differential pressure.
One end of the water conveying pipeline is generally connected with a gas-liquid lifting system, and the other end of the water conveying pipeline extends to the outside of the collecting cylinder; one end of the gas transmission pipeline is connected with the cavity, and the other end of the gas transmission pipeline extends to the outside of the collecting cylinder so as to be convenient for collection; under the action of formation pressure and gravity, the liquid in the cavity moves downwards, and the gas-liquid lifting system presses the liquid in the cavity into the water conveying pipeline and lifts the liquid; the gas in the cavity moves upwards through the gas transmission pipeline; the lifting power device adopts an electric pump which is an electric submersible centrifugal pump, an electric submersible screw pump or a combination of the electric submersible centrifugal pump and the electric submersible screw pump.
In the first embodiment, the cavity is arranged on the inner side of the barrel body of the mining barrel and is cylindrical; the sand control device is disc-shaped and covers the bottom side of the cavity. The one-way water permeable protective component is arranged on the upper side and the lower side of the sand control device and is tightly attached to the sand control device. The one-way water permeable protection member allows solids, liquids and gases to pass through in a single horizontal direction or a single vertical direction, similar to a honeycomb structure.
The input end of the lifting power device is connected with a gas-liquid separation device, and a water-stop plate fixed on the top of the sand control device and vertical to the top of the sand control device is arranged in the cavity.
Under the action of formation pressure and gravity, liquid in the cavity bypasses the water-stop sheet, is purified by the gas-liquid separation device, then enters the lifting power device through the water conveying channel, and further enters the water conveying pipe under the action of lifting power; the gas in the cavity moves upwards through the gas transmission channel and enters the gas transmission pipeline. And the gas-liquid separation device is arranged at the inlet of the lifting power device and is used for performing secondary separation of liquid and gas after the liquid and the gas are subjected to gravity separation in the cavity so as to prevent the gas from entering the lifting power device. The lifting power device in the scheme directly adopts the water pump, and other pump body forms can be adopted as the lifting power device in the actual design.
In the embodiment, the appearance of the mining barrel is a cylinder with equal diameter, a cylinder with unequal diameter or a cylinder with skirt around or a polygon prism cylinder;
when the mining device works, the mining cylinder needs to be constructed by means of a sea surface support system, and the sea surface support system adopts a ship or an offshore platform; the sea surface treatment system comprises a gas drying device, a gas compression device and a gas storage tank, is arranged on the sea surface support system and is used for treating, storing and transporting natural gas; the anchor cable system is used for lowering, lifting and moving the mining barrel and comprises a cable and a cable control device, wherein one end of the cable is connected with the top of the mining barrel, and the other end of the cable is connected with the cable control device; the cable control device is arranged on the sea surface support system. The sea surface supporting system and the sea surface processing system are subsequent processing equipment for oil and gas exploitation.
When the sand control device is arranged in the mining cylinder, the through hole which can be opened and closed through remote control is arranged on the cylinder body, the inner part and the outer part of the mining cylinder are communicated, and the mining of natural gas hydrate around the mining cylinder is realized.
Of course, the sea area natural gas hydrate cartridge type mining device further comprises a power supply system and a control system, wherein the power supply system provides power for mining operation, and the control system controls each device to operate.
The mining cylinder can submerge by means of the pressure difference between the inside and the outside of the cylinder and gravity, and can be further provided with a scouring auxiliary submerging system, wherein the scouring auxiliary submerging system comprises an electric rotating wheel and a water injection scouring system, and the water injection scouring system comprises a water injection device and a water sand discharge pipeline; the flushing submergence system can flush silt in the cylinder out of the cylinder.
The mining cylinder can submerge by means of the pressure difference between the inside and the outside of the cylinder and gravity, and can be provided with a high-frequency vibration device, so that the submerging depth of the mining cylinder can be increased.
In a second embodiment, based on any one of the above embodiments, the marine natural gas hydrate cartridge mining device further includes a jet injection system; the jet injection system comprises a driving device, a pipeline and a jet orifice; the driving device provides injection power for the jet injection system; the jet injection system is for: (1) when the natural gas hydrate decomposition range is insufficient, water is sprayed to a reservoir stratum around the extraction cylinder, the decomposition interface can be increased through the hydraulic cutting effect of the water, and the extraction efficiency is improved; (2) under the condition that the natural gas hydrate reservoir layer is high in hardness, when the mining cylinder is difficult to reach a preset depth through a conventional method, water is sprayed to the lower portion of the mining cylinder, and the mining cylinder can be promoted to further submerge under the action of hydraulic cutting; (3) injecting hot seawater, or carbon dioxide, or a chemical inhibitor into the mining range to promote the decomposition of the natural gas hydrate; (4) water injection can also reduce fine silt around the mining device, thereby improving permeability; (5) carbon dioxide is injected into the upper part of the reservoir, and the carbon dioxide and the surrounding water form a carbon dioxide hydrate, so that the strength of the stratum on the upper part of the reservoir can be improved, and the stability of the reservoir is improved.
The method for mining the marine natural gas hydrate cartridge is implemented by utilizing the structure of the mining cartridge, and comprises the following steps:
(1) selecting a mining area, and lowering a mining cylinder under the support of a sea surface support system and an anchor cable system to be buckled on the seabed;
(2) and liquid in the mining cylinder is discharged outwards through the water pump to reduce the pressure in the mining cylinder, the mining cylinder sinks downwards under the action of pressure difference, and the mining cylinder carries the gas-liquid lifting system and the sand prevention device to enter a natural gas hydrate reservoir stratum and/or a natural gas hydrate and free gas mixing layer and/or a free natural gas layer.
(3) And lifting liquid and/or gas in a cavity formed by the mining cylinder and the sand control device through a gas-liquid lifting system, reducing the internal pressure of the cavity to further reduce the pressure of surrounding strata, promoting the decomposition of natural gas hydrate in the surrounding strata, enabling water and natural gas formed by decomposition to enter the cavity through the sand control device under the action of differential pressure, lifting the liquid and the natural gas at the same time, lifting the liquid to the seabed or a sea surface treatment system, and lifting the gas to the sea surface treatment system to realize the exploitation of the natural gas hydrate.
And (3) injecting carbon dioxide to the upper side and/or the periphery of the production cylinder by using a jet injection system between the step (2) and the step (3) under the condition that the upper covering layer of the hydrate reservoir is soft, wherein the carbon dioxide and the surrounding water form carbon dioxide hydrate, and the formation stability can be improved.
The utility model discloses if disclose or related to mutual 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 (7)
1. A drum type exploitation device for sea natural gas hydrate is characterized by comprising an exploitation drum capable of sinking below the sea surface, a water pump, a sand prevention device and a gas-liquid lifting system; the mining barrel comprises a top plate and a barrel body extending from the lower part of the top plate to form a cylindrical structure with a closed upper side and an unclosed lower side; the water pump is fixed on the top plate and communicated with the inner cavity of the barrel body, and liquid in the mining barrel can be discharged outwards through the water pump to reduce the pressure in the mining barrel and control the mining barrel to sink in the stratum;
the sand prevention device is positioned at the bottom of the mining barrel, a cavity is formed between the sand prevention device and the mining barrel, and the cavity is cylindrical; the cavity is communicated with a water pipeline and a gas pipeline;
the gas-liquid lifting system comprises at least one lifting power device, wherein one end of the lifting power device is connected with the cavity, and the other end of the lifting power device is connected with or lifts liquid and/or gas in the cavity through a channel.
2. The marine natural gas hydrate barrel type mining device according to claim 1, wherein one end of the water conveying pipeline is connected with a gas-liquid lifting system, and the other end of the water conveying pipeline extends to the outside of the collecting barrel; one end of the gas transmission pipeline is connected with the cavity, and the other end of the gas transmission pipeline extends to the outside of the collecting cylinder so as to be convenient for collection; under the action of formation pressure and gravity, the liquid in the cavity moves downwards, and the gas-liquid lifting system presses the liquid in the cavity into the water conveying pipeline and lifts the liquid; the gas in the cavity moves upwards through the gas transmission pipeline; the lifting power device is an electric pump, and the electric pump is an electric submersible centrifugal pump, an electric submersible screw pump or a combination of the electric submersible centrifugal pump and the electric submersible screw pump.
3. The marine natural gas hydrate barrel mining device of claim 1 or 2, wherein the sand control device is in a shape of a disc and covers the bottom side of the cavity, and the upper surface and the lower surface of the sand control device are provided with one-way water-permeable protection members to be tightly attached to the sand control device.
4. The marine natural gas hydrate drum mining device according to claim 1 or 2, wherein the input end of the lifting power device is connected with a gas-liquid separation device.
5. The marine natural gas hydrate barrel mining device of claim 1 or 2, wherein the cavity is provided with a vertical water-stop plate fixed on the top of the sand control device.
6. An offshore natural gas hydrate cartridge mining device according to claim 1 or 2, wherein the top of the mining cartridge is provided with lugs.
7. The marine natural gas hydrate cartridge mining device of claim 1 or 2, wherein a jet injection system is embedded in the mining cartridge; the jet injection system comprises an injection pump and jet ports distributed on the surface of the mining barrel, and a jet pipeline is communicated with the inside of each jet port; the injection pump injects water, hot seawater, carbon dioxide, or chemical inhibitors into the production area through the injection pipe to the injection port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023069593.7U CN214303789U (en) | 2020-12-18 | 2020-12-18 | Sea area natural gas hydrate barrel type mining device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023069593.7U CN214303789U (en) | 2020-12-18 | 2020-12-18 | Sea area natural gas hydrate barrel type mining device |
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| CN214303789U true CN214303789U (en) | 2021-09-28 |
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| CN202023069593.7U Active CN214303789U (en) | 2020-12-18 | 2020-12-18 | Sea area natural gas hydrate barrel type mining device |
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