CN112360401B - Sea area natural gas hydrate self-entering mining simulation test device and test method thereof - Google Patents
Sea area natural gas hydrate self-entering mining simulation test device and test method thereof Download PDFInfo
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- CN112360401B CN112360401B CN202011510932.2A CN202011510932A CN112360401B CN 112360401 B CN112360401 B CN 112360401B CN 202011510932 A CN202011510932 A CN 202011510932A CN 112360401 B CN112360401 B CN 112360401B
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000004088 simulation Methods 0.000 title claims abstract description 45
- 238000005065 mining Methods 0.000 title claims abstract description 18
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000009471 action Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 90
- 239000007789 gas Substances 0.000 claims description 50
- 238000003860 storage Methods 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 22
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 19
- 238000000354 decomposition reaction Methods 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000003345 natural gas Substances 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 9
- 230000005674 electromagnetic induction Effects 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 239000013000 chemical inhibitor Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- -1 Natural gas hydrates Chemical class 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000005266 casting Methods 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012018 process simulation test Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Business, Economics & Management (AREA)
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Abstract
The invention provides a sea area natural gas hydrate self-entry mining simulation test device and a test method thereof. The invention has reasonable design and simple structure, can simulate the penetration of the exploitation device, the exploitation of the natural gas hydrate and the recovery of the exploitation device, can truly simulate the exploitation process of the sea natural gas hydrate self-entry exploitation method, and has important significance for researching the applicability, exploitation efficiency, action range and the like of the sea natural gas hydrate self-entry exploitation device.
Description
Technical Field
The invention relates to a sea area natural gas hydrate self-entering mining simulation test device and a test method thereof.
Background
Natural gas hydrates are ice-like crystalline substances formed from natural gas and water under high pressure and low temperature conditions, which are distributed in deep sea sediments or permanent frozen soil of land areas. The combustible ice after combustion only generates a small amount of carbon dioxide and water, and compared with traditional energy sources such as coal, petroleum and the like, the pollution degree is obviously reduced and the energy is 10 times higher. The total amount of the organic carbon resources is 2 times of the total amount of the known coal, oil and natural gas worldwide, and the organic carbon resources are internationally recognized as the successor energy of the oil and the natural gas.
Natural gas hydrate recovery techniques can be broadly divided into: the decompression method, the heat injection method, the chemical agent method, the carbon dioxide displacement exploitation method and the solid fluidization method, wherein the exploitation modes require the upper cladding of the hydrate reservoir to be a closed cladding, have good tightness and certain thickness and have solid structures, but the exploitation methods cannot accurately and effectively control the decomposition speed and exploitation range of the hydrate, can possibly cause marine geological environment disasters, and can be used for exploiting the natural gas hydrate with the prior art.
The natural gas hydrate exploitation technology is evaluated and analyzed from the angle of numerical simulation, and a reference is provided for optimizing an optimal exploitation method. However, if the test simulation is left, under the condition that the current on-site test data are limited, the accuracy of the simulation result is difficult to verify, and the action mechanism of the natural gas hydrate exploitation measures cannot be explained. Therefore, the natural gas hydrate exploitation process simulation test technology has irreplaceable functions in the aspects of hydrate exploitation theory and technology foundation research.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide the sea natural gas hydrate self-entering type exploitation simulation test device and the test method thereof, which have simple structure and convenient use, can simulate the exploitation device penetration, the natural gas hydrate exploitation and the exploitation device recovery, can truly simulate the exploitation process of the sea natural gas hydrate self-entering type exploitation method, and have important significance for researching the applicability, the exploitation efficiency and the action range of the sea natural gas hydrate self-entering type exploitation device.
The specific embodiment of the invention is formed by comprising a high-pressure test box internally provided with seawater, a simulated seabed and a simulated natural gas hydrate reservoir, wherein the high-pressure test box is internally provided with a simulated self-entering structure which is flushed into the simulated natural gas hydrate reservoir from the outside of the high-pressure test box, and the simulated self-entering structure is driven to be ejected by an emitter.
Further, a cavity is formed in the middle of the simulation self-entering structure body, and the simulation self-entering structure body comprises a connecting member, a main body member, side wings positioned on two sides of the upper part of the main body member and a head member positioned on the lower part of the main body member, which are sequentially arranged from top to bottom; the lower part of the head component is provided with a sharp part.
Further, the main body member includes inboard protection component that permeates water, sand control device and outside that set gradually by cavity both sides outside respectively, the cavity opening part of main body member top is provided with the cable packer, main body member lower part is equipped with the end component, end component is connected with the head component.
Further, a gas-liquid collection system is arranged above the high-pressure test box and consists of a water storage system and a gas storage system, the gas storage system comprises a gas storage tank, a gas compression device, a gas drying device, a first flow monitor and a gas transmission pipe which are sequentially arranged, the upper end of the gas transmission pipe is connected with the gas storage tank through the first flow monitor, the gas drying device and the gas compression device in sequence, and the lower end of the gas transmission pipe is connected with the top of a cavity which is simulated to be in the structure; the water storage system comprises a water storage tank, a water pump, a second flow monitor and a water delivery pipe which are sequentially arranged, the lower end of the water delivery pipe extends to the bottom in a cavity in the middle of the simulated self-entering structure body, the lower end of the water delivery pipe is provided with a gas-liquid separation device, and the upper end of the water delivery pipe is sequentially connected with the water storage tank through the second flow monitor and the water pump and is used for pumping liquid in the cavity of the simulated self-entering structure body into the water storage tank.
Further, the launching device comprises an ejection device and a vertical drawing system, wherein the ejection device is used for giving a certain initial speed to the simulated self-entering structural body to enable the simulated self-entering structural body to reach a specified depth; the vertical drawing system comprises a lifting system and a cable, wherein the upper part of the cable is connected with the lifting system, and the lower end of the cable is connected with the top of the simulation self-entering structure body.
Further, the outside portion of the high-pressure test box is provided with a water pressure control system and a temperature regulating system, the water pressure control system is used for applying water pressure to the high-pressure test box to simulate the deep sea water pressure environment, and the temperature regulating system is used for regulating the temperature in the high-pressure test box.
Further, the simulated natural gas hydrate reservoir is composed of a natural gas hydrate simulated overburden, a natural gas hydrate simulated reservoir, and a simulated natural gas hydrate underblad.
Further, the simulation is from being provided with jet injection system on the income structure, jet injection system includes drive arrangement, jet pipeline and is located a plurality of jet ports on the jet pipeline, the jet pipeline includes vertical pipeline and many respectively is located simulation from going into structure upper portion, simulation from going into the horizontal pipeline of structure lower part, vertical pipeline lower extreme extends to the head component and divide into two at least branches, the jet port is located the output of horizontal pipeline or is the output of branch road, drive arrangement provides injection power for jet injection system for water is spouted by different jet ports and is carried out the hydraulic cutting to simulated natural gas hydrate reservoir.
Further, the lower part of the simulation self-entering structure body is provided with an auxiliary heating system, the auxiliary heating system comprises an electromagnetic induction coil and an electromagnetic heating controller, and the electromagnetic induction coil surrounds the surface of the lower part of the simulation self-entering structure body.
Further, the test method of the sea area natural gas hydrate self-entry mining simulation test device comprises the following steps: (1) Checking the running condition of each system, the pipeline connection and the equipment parameter setting condition of the sea area natural gas hydrate self-entering type exploitation test simulation test device, and ensuring that the sea area natural gas hydrate self-entering type exploitation test simulation test device operates normally; (2) The pressure and the temperature in the high-pressure test chamber are regulated to meet the test requirements through a water pressure control system and a temperature regulating system; (3) Releasing a simulated self-entering structure body on the upper side of the test box through an ejection device and a vertical drawing system, and flushing the simulated self-entering structure body into the simulated natural gas hydrate reservoir for internal fixation; (4) The water pump drives the water delivery pipe to pump out water in the cavity, the internal pressure of the cavity and the pressure of surrounding stratum are reduced, natural gas hydrate in the surrounding stratum is promoted to be decomposed, the decomposed water and natural gas continuously enter the cavity under the action of pressure difference, the water further continuously enters the water delivery pipe, and the natural gas continuously enters the gas delivery pipe, so that the self-entering type simulated exploitation of the natural gas hydrate is realized. (5) In addition, in the working process, the simulated self-entering structure body heats around by an auxiliary heating system or hot seawater injection, so that the natural gas hydrate decomposition efficiency is improved; the jet injection system is used for injecting chemical inhibitors to the reservoir around the simulated self-entering structure body, so that the natural gas hydrate decomposition efficiency is improved; when the natural gas hydrate decomposition range is insufficient, the jet injection system can also spray water in the water storage tank to the reservoir around the simulated self-entering structure body, and the hydraulic cutting effect can increase the decomposition interface.
Compared with the prior art, the invention has the following beneficial effects: the device has the advantages of simple structure and reasonable design, can simulate the penetration of the exploitation device, the exploitation of the natural gas hydrate and the recovery of the exploitation device, can truly simulate the exploitation process of the sea area natural gas hydrate self-entry exploitation method, and has important significance for researching the applicability, exploitation efficiency, action range and the like of the sea area natural gas hydrate self-entry exploitation device.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a simulated self-entry structure according to an embodiment of the present invention;
FIG. 3 is a schematic view of the internal arrangement of the body member of an embodiment of the present invention;
FIG. 4 is a schematic diagram of an auxiliary heating system according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a jet injection system according to an embodiment of the present invention.
In the figure: a-natural gas hydrate simulated overburden; b-natural gas hydrate simulated reservoirs; c-mimicking a natural gas hydrate lower cladding; d-a high-pressure test box; 1-simulating a self-entry structure; 11-a connecting member; 12-flanks; 13-a body member; 14-a head member; 15-passing a cable packer; 16-an outboard water permeable guard member; 17-an inner water permeable guard member; 18-end members; 2-launching means, 21-cable; 22-ejection means; 23-a lifting system; 3-a sand control device; 31-cavity; 4-a water storage system and 41-a water delivery pipe; 42-gas pipe; 43-water pump; 44-a water storage tank; 45-a gas-liquid separation device; 5-gas storage system, 51-gas drying device; 52-a gas compression device; 53-gas storage tank; 61-a first flow monitor; 62-a second flow monitor; 71-a temperature regulation system; 72-a water pressure control system; 81-an electromagnetic induction coil; 91-jet tubing; 92-jet port.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Examples: as shown in fig. 1 to 5, a sea area natural gas hydrate self-entry mining simulation test device is provided, which comprises a high-pressure test box D internally provided with seawater, a simulated seabed and a simulated natural gas hydrate reservoir, wherein the high-pressure test box is internally provided with a simulated self-entry structure body 1 which is flushed into the simulated natural gas hydrate reservoir from the outside of the high-pressure test box, and the simulated self-entry structure body is driven by a transmitting device 2 to be transmitted.
The simulated natural gas hydrate reservoir consists of a natural gas hydrate simulated upper coating A, a natural gas hydrate simulated reservoir B and a simulated natural gas hydrate lower coating C.
The middle part of the simulation self-entering structure body is provided with a cavity 31, the simulation self-entering structure body comprises a connecting member 11, a main body member 13, side wings 12 positioned at two sides of the upper part of the main body member and a head member 14 positioned at the lower part of the main body member, which are sequentially arranged from top to bottom, wherein the connecting member is used for connecting the main body member, the ejection device and the vertical drawing system; the lower part of the head component is provided with a sharp part, and the lower part of the head component can be conical or arc-shaped cap-shaped;
the side wings are used for adjusting the falling posture of the simulated self-entering structure body in water, so that deflection is reduced.
The main body member comprises an inner water permeable protection member 17, a sand control device 3 and an outer water permeable protection member 16 which are respectively and sequentially arranged outside two sides of the cavity, a cable passing packer 15 is arranged at the opening of the cavity above the main body member, an end head member 18 is arranged at the lower part of the main body member, and the end head member is connected with the head member.
The simulated self-entering structure body is bullet-shaped, and the main body member is cylindrical and can be used for accommodating the sand control device and a conveying channel for conveying gas or liquid; the sand prevention device allows gas or liquid to pass through and plays a role in filtering sediment; the inner and outer water permeable protective members may protect the sand control device from damage.
In this embodiment, a gas-liquid collection system is disposed above the high-pressure test chamber, the gas-liquid collection system is composed of a water storage system 4 and a gas storage system 5, the gas storage system 5 includes a gas storage tank 53, a gas compression device 52, a gas drying device 51, a first flow monitor 61 and a gas pipe 42 which are sequentially disposed, the upper end of the gas pipe is connected with the gas storage tank through the first flow monitor, the gas drying device and the gas compression device in sequence, and the lower end of the gas pipe is connected with the top of a cavity simulating the inside of the self-entering structure; the water storage system 4 comprises a water storage tank 44, a water pump 43, a second flow monitor 62 and a water delivery pipe 41 which are sequentially arranged, the lower end of the water delivery pipe extends to the bottom in a cavity in the middle of the simulated self-entering structure body, the lower end of the water delivery pipe is provided with a gas-liquid separation device 45, and the upper end of the water delivery pipe is sequentially connected with the water storage tank through the second flow monitor and the water pump and is used for pumping liquid in the cavity of the simulated self-entering structure body into the water storage tank.
The gas-liquid collection system can transfer liquid and gas in the cavity to an external treatment system, meanwhile, the internal pressure of the cavity can be reduced, the surrounding stratum pressure is reduced, natural gas hydrate decomposition is promoted, the natural gas hydrate enters the cavity through the sand prevention device under the action of pressure difference, the liquid in the cavity moves downwards under the action of gravity, the gas moves upwards, the gas is collected into the gas storage tank, and the liquid is pumped into the liquid storage tank.
In addition, the gas-liquid separation device is used for carrying out secondary separation of liquid and gas after the liquid and the gas are subjected to gravity separation in the cavity, so that the gas is prevented from entering the water delivery pipe.
In this embodiment, the launching device includes an ejection device 22 and a vertical pulling system, where the ejection device is used to give a certain initial speed to the simulated self-entering structure to enable the simulated self-entering structure to reach a specified depth; the vertical drawing system comprises a lifting system 23 and a cable 21, wherein the upper part of the cable is connected with the lifting system, and the lower end of the cable is connected with the top of the simulation self-entering structure.
In this embodiment, the outside portion of the high-pressure test chamber is provided with a hydraulic control system and a temperature regulating system, the hydraulic control system is used for applying hydraulic pressure to the high-pressure test chamber to simulate the deep sea hydraulic pressure environment, and the temperature regulating system is used for regulating the temperature in the high-pressure test chamber.
In this embodiment, the simulated self-entering structure body is provided with a jet injection system, the jet injection system comprises a driving device, a jet pipeline 91 and a plurality of jet ports 92 positioned on the jet pipeline, the jet pipeline comprises a vertical pipeline and 4 horizontal pipelines respectively positioned on the upper part of the simulated self-entering structure body and the lower part of the simulated self-entering structure body, one of the horizontal pipelines is arranged on the upper part of the simulated self-entering structure body, the other three horizontal pipelines are arranged on the lower part of the simulated self-entering structure body at intervals, each horizontal pipeline is communicated with the vertical pipeline, the lower end of the vertical pipeline extends to the head member and is at least divided into two branches, the jet ports are positioned at the output ends of the horizontal pipeline or the output ends of the branches, and the driving device provides injection power for the jet injection system and is used for jetting water from different jet ports to perform hydraulic cutting on simulated natural gas hydrate reservoirs.
The input end of the jet pipeline can be connected with a water storage tank or other external water sources and is extracted by a driving device.
The jet injection system functions as: (1) When the natural gas hydrate decomposition range is insufficient, the jet injection system injects water to the reservoir around the simulated self-entering structure body, the hydraulic cutting effect of the jet injection system can increase the decomposition interface, and the exploitation efficiency is improved; (2) Under the condition that the simulated natural gas hydrate simulated reservoir hardness is large, when the simulated self-entering structure body fails to reach a preset depth, the jet injection system injects water to the lower part of the simulated self-entering structure body, and the hydraulic cutting action of the jet injection system can promote the simulated self-entering structure body to further submerge; (3) The jet injection system can also inject hot seawater, or carbon dioxide, or chemical inhibitor into the exploitation range, so that the natural gas hydrate decomposition efficiency is improved; (4) Carbon dioxide can be injected into the upper part of the simulated natural gas hydrate reservoir, and the carbon dioxide and surrounding water are solidified, so that the strength of the stratum placed in the upper part of the simulated natural gas hydrate reservoir can be improved, and the stability is improved.
In this embodiment, an auxiliary heating system is disposed at the lower part of the simulated self-entering structure, and the auxiliary heating system includes an electromagnetic induction coil and an electromagnetic heating controller, where the electromagnetic induction coil surrounds the lower surface of the simulated self-entering structure;
by utilizing the characteristic that the simulated self-entering structure body mainly consists of steel, the electromagnetic induction coil directly surrounds the simulated self-entering structure body, so that the simulated self-entering structure body heats, the decomposition speed of surrounding natural gas hydrate is improved, and the secondary generation of the natural gas hydrate is prevented.
In the embodiment, the sea area natural gas hydrate self-entering mining simulation test device further comprises a control system, a monitoring system and a power supply system; the power supply system is used for providing power for the test equipment; the control system is used for controlling the running of each test device and the opening and closing of the pipeline; and the monitoring system is used for monitoring the running condition of each test device.
In this embodiment, in operation:
(1) Checking the running condition of each system, the pipeline connection and the equipment parameter setting condition of the sea area natural gas hydrate self-entering type exploitation test simulation test device, and ensuring that the sea area natural gas hydrate self-entering type exploitation test simulation test device operates normally;
(2) The pressure and the temperature in the high-pressure test chamber are regulated to meet the test requirements through a water pressure control system and a temperature regulating system;
releasing a simulated self-entering structure body on the upper side of the test box through an ejection device and a vertical drawing system, wherein the simulated self-entering structure body is flushed into the simulated natural gas hydrate reservoir (generally flushed into the natural gas hydrate simulated reservoir or a lower coating of the natural gas hydrate simulated reservoir);
(3) The water pump drives the water delivery pipe to pump out water in the cavity, the internal pressure of the cavity and the pressure of surrounding stratum are reduced, natural gas hydrate in the surrounding stratum is promoted to be decomposed, the decomposed water and natural gas continuously enter the cavity under the action of pressure difference, the water further continuously enters the water delivery pipe, and the natural gas continuously enters the gas delivery pipe, so that the self-entering type simulated exploitation of the natural gas hydrate is realized.
(4) In addition, in the working process, the simulated self-entering structure body heats around by an auxiliary heating system or hot seawater injection, so that the natural gas hydrate decomposition efficiency is improved; the jet injection system is used for injecting chemical inhibitors to the reservoir around the simulated self-entering structure body, so that the natural gas hydrate decomposition efficiency is improved; when the natural gas hydrate decomposition range is insufficient, the jet injection system can also spray water in the water storage tank to the reservoir around the simulated self-entering structure body, and the hydraulic cutting effect can increase the decomposition interface.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (9)
1. The sea area natural gas hydrate self-entry mining simulation test device is characterized by comprising a high-pressure test box, wherein sea water, a simulated seabed and a simulated natural gas hydrate reservoir are arranged in the high-pressure test box, a simulated self-entry structure which is flushed into the simulated natural gas hydrate reservoir from the outside of the high-pressure test box is arranged in the high-pressure test box, and the simulated self-entry structure is driven by a transmitting device to be transmitted;
the middle part of the simulation self-entering structure body is provided with a cavity, and the simulation self-entering structure body comprises a connecting component, a main body component, side wings positioned at two sides of the upper part of the main body component and a head component positioned at the lower part of the main body component, which are sequentially arranged from top to bottom; the lower part of the head component is provided with a sharp part;
the main body member comprises an inner side water permeable protection member, a sand control device and an outer side water permeable protection member which are respectively arranged outside from two sides of the cavity in sequence, a cable packer is arranged at the opening of the cavity above the main body member, an end head member is arranged at the lower part of the main body member, and the end head member is connected with the head member.
2. The sea area natural gas hydrate self-entering mining simulation test device according to claim 1, wherein a gas-liquid collecting system is arranged above the high-pressure test box, the gas-liquid collecting system consists of a water storage system and a gas storage system, the gas storage system comprises a gas storage tank, a gas compression device, a gas drying device, a first flow monitor and a gas pipe which are sequentially arranged, the upper end of the gas pipe is sequentially connected with the gas storage tank through the first flow monitor, the gas drying device and the gas compression device, and the lower end of the gas pipe is connected with the top of a cavity in the simulated self-entering structure; the water storage system comprises a water storage tank, a water pump, a second flow monitor and a water delivery pipe which are sequentially arranged, the lower end of the water delivery pipe extends to the bottom in a cavity in the middle of the simulated self-entering structure body, the lower end of the water delivery pipe is provided with a gas-liquid separation device, and the upper end of the water delivery pipe is sequentially connected with the water storage tank through the second flow monitor and the water pump and is used for pumping liquid in the cavity of the simulated self-entering structure body into the water storage tank.
3. The sea natural gas hydrate self-entry mining simulation test device according to claim 2, wherein the launching device comprises an ejection device and a vertical drawing system, and the ejection device is used for giving a certain initial speed to the self-entry simulation structure body to enable the self-entry simulation structure body to reach a specified depth; the vertical drawing system comprises a lifting system and a cable, wherein the upper part of the cable is connected with the lifting system, and the lower end of the cable is connected with the top of the simulation self-entering structure body.
4. The sea area natural gas hydrate self-entry mining simulation test device according to claim 3, wherein a water pressure control system and a temperature regulating system are arranged on the outer side portion of the high-pressure test box, the water pressure control system is used for applying water pressure to the high-pressure test box to simulate the deep sea water pressure environment, and the temperature regulating system is used for regulating the temperature in the high-pressure test box.
5. The sea area natural gas hydrate self-entry mining simulation test device according to claim 1 or 2, wherein the simulated natural gas hydrate reservoir consists of a natural gas hydrate simulated overburden, a natural gas hydrate simulated reservoir and a simulated natural gas hydrate underblad.
6. The sea area natural gas hydrate self-entry mining simulation test device according to claim 4, wherein a jet injection system is arranged on the self-entry structure body, the jet injection system comprises a driving device, a jet pipeline and a plurality of jet ports arranged on the jet pipeline, the jet pipeline comprises a vertical pipeline and a plurality of horizontal pipelines respectively arranged on the upper part of the self-entry structure body and the lower part of the self-entry structure body, the lower end of the vertical pipeline extends to a head member and is divided into at least two branches, the jet ports are arranged at the output end of the horizontal pipeline or the output end of the branches, and the driving device is used for providing injection power for the jet injection system so as to jet water from different jet ports to hydraulically cut the simulated natural gas hydrate reservoir.
7. The sea natural gas hydrate self-entry mining simulation test device according to claim 6, wherein an auxiliary heating system is arranged at the lower part of the self-entry simulation structure body, and comprises an electromagnetic induction coil and an electromagnetic heating controller, and the electromagnetic induction coil surrounds the lower surface of the self-entry simulation structure body.
8. A test method using the sea area natural gas hydrate self-entry mining simulation test apparatus as set forth in claim 7, comprising the steps of: (1) Checking the running condition of each system, the pipeline connection and the equipment parameter setting condition of the sea area natural gas hydrate self-entering mining simulation test device, and ensuring that the sea area natural gas hydrate self-entering mining simulation test device operates normally; (2) The pressure and the temperature in the high-pressure test chamber are regulated to meet the test requirements through a water pressure control system and a temperature regulating system; (3) Releasing a simulated self-entering structure body on the upper side of the test box through an ejection device and a vertical drawing system, and flushing the simulated self-entering structure body into the simulated natural gas hydrate reservoir for internal fixation; (4) The water pump drives the water delivery pipe to pump out water in the cavity, the internal pressure of the cavity and the pressure of surrounding stratum are reduced, natural gas hydrate in the surrounding stratum is promoted to be decomposed, the decomposed water and natural gas continuously enter the cavity under the action of pressure difference, the water further continuously enters the water delivery pipe, and the natural gas continuously enters the gas delivery pipe, so that the self-entering simulated exploitation of the natural gas hydrate is realized; (5) In addition, in the working process, the simulation self-entering structure body heats up through the auxiliary heating system, so that the natural gas hydrate decomposition efficiency is improved; the jet injection system is used for injecting chemical inhibitors to the reservoir around the simulated self-entering structure body, so that the natural gas hydrate decomposition efficiency is improved; when the natural gas hydrate decomposition range is insufficient, the jet injection system can spray water in the water storage tank to the reservoir around the simulated self-entering structure body, and the hydraulic cutting effect can increase the decomposition interface.
9. The method of testing a sea natural gas hydrate self-entry mining simulation test apparatus according to claim 8, wherein in step (5), the auxiliary heating system is hot seawater injection.
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