CN113090245A - Underground rotational flow sorting and separating device and method for natural gas hydrate - Google Patents
Underground rotational flow sorting and separating device and method for natural gas hydrate Download PDFInfo
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- CN113090245A CN113090245A CN202110420314.7A CN202110420314A CN113090245A CN 113090245 A CN113090245 A CN 113090245A CN 202110420314 A CN202110420314 A CN 202110420314A CN 113090245 A CN113090245 A CN 113090245A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention relates to a natural gas hydrate underground cyclone sorting and separating device, and belongs to the technical field of natural gas hydrate exploitation. The cyclone sorting and separating device is composed of an outer pipe and an inner pipe, the inner pipe is installed in the outer pipe through fixing plates arranged at intervals, and a cyclone separator is welded on the inner wall of the inner pipe. The cyclone sorting and separating device can realize sorting of natural gas hydrate and silt particles and can carry out in-situ separation on the natural gas hydrate and the silt, so that purer natural gas hydrate can be obtained, the exploitation efficiency can be effectively improved, and the exploitation cost is greatly reduced; the sediment can be discharged to the seabed again through the sand discharge hole 9, so that the sediment can be backfilled, and the safety and the reliability during mining can be further ensured; the problems of high mining cost and poor safety and reliability of the existing mining mode are solved, and the method is particularly suitable for mining natural gas hydrate.
Description
Technical Field
The invention relates to a natural gas hydrate underground cyclone sorting and separating device, and belongs to the technical field of natural gas hydrate exploitation.
Background
The clean natural gas hydrate is like ice and snow, can be directly ignited, and is commonly called as 'combustible ice'. The natural gas hydrate (combustible ice) is a white ice-snow-like crystal compound formed by natural gas (main component methane) and water under the condition of low temperature and high pressure, and has the characteristics of large reserve, wide distribution, shallow burial, high energy density and clean combustion. Widely distributed in sediments at the edge of the continental land, at the seabed and in permafrost areas, and is praised as one of new energy sources with the most application prospect in the future. The sea natural gas hydrate is widely distributed and has a large resource amount, is a substitute energy source for the conventional petroleum and natural gas in the future, and is scientifically researched and tried in many countries in the world at present.
The mainstream exploitation method of the natural gas hydrate comprises the following steps: depressurization, heat shock, CO2/N2 displacement, injection of inhibitors, solid state fluidization and combination of the above. The pressure reduction method has the lowest technical difficulty and cost, the solid fluidization method is adopted, and the rest methods have higher mining cost, high requirements on equipment and harsh construction conditions. In 2017, a first round of hypotensor trial production and a second round of hypotensor trial production are respectively carried out on the sea floors of 1266 m and 1225 m deep water in the sea area of the south China Hicishi fox, breakthrough progress is achieved, and the sea floors still face risks of damaging the environment and engineering geology. In the north litchi bay of south China sea in the same year, the sea oil successfully implements the solid-state fluidization pilot mining operation of the marine shallow non-diagenetic natural gas hydrate for the first time globally, the exploitation of the natural gas hydrate achieves breakthrough progress, and the elimination of environmental and engineering geological risks in the in-situ exploitation process of the natural gas hydrate is realized.
There have been many patents on the exploitation of natural gas hydrates:
according to patent CN112081559A, the device and the method for extracting natural gas hydrate by using depressurization and double-pipe injection modified fluid utilize an inner pipe column to carry out depressurization, air extraction and extraction on reservoir natural gas hydrate, and utilize the bottom of an outer shaft pipe column to arrange a sensor to storage conditions, thereby improving the permeability of the reservoir and ensuring the smoothness of a fluid flow channel and the smoothness of depressurization and gas extraction. However, the depressurization method is a weakening passive exploitation method, and has the disadvantages that the exploitation of natural gas is slow, and has certain limitations, and the separation and backfilling of silt mixed in the natural gas hydrate slurry cannot be realized, so that the exploitation cost of the natural gas hydrate is increased, and the silt is not separated and discharged to the seabed in time, so that the safety of the exploitation process cannot be ensured.
According to the natural gas hydrate thermal excitation method reaction device disclosed by the patent CN104196510A, the nano aluminum powder conveying pipeline and the gas collecting pipeline are arranged in the external guide pipe, and the ignition explosive is arranged at the front end of the nano aluminum powder conveying pipeline, so that the natural gas hydrate exploitation process is more flexible, and the exploitation efficiency of each vertical shaft is improved. However, the thermal shock method causes a great deal of heat loss and low heat utilization rate in the implementation process, which causes a great deal of energy waste, and simultaneously, the silt cannot be backfilled in time in the mining process, so that the safety and reliability in the mining process cannot be ensured.
Therefore, it is necessary to invent a natural gas hydrate downhole cyclone sorting and separating device to solve the above problems.
Disclosure of Invention
The purpose of the invention is: aiming at the defects of the prior art, the underground natural gas hydrate cyclone sorting and separating device can separate natural gas hydrate from silt in situ and discharge the silt to the seabed, thereby ensuring the safety and reliability and reducing the exploitation cost.
The technical scheme of the invention is as follows:
the utility model provides a natural gas hydrate is whirl sequencing separator in pit, it comprises outer tube and inner tube, its characterized in that: the inner pipe is installed in the outer pipe through fixed plates arranged at intervals, and the inner wall of the inner pipe is welded with a cyclone separator.
The cyclone separator comprises a cyclone cylinder, an upper supporting plate and a lower supporting plate, the upper supporting plate and the lower supporting plate are fixedly arranged in the inner tube at intervals, and the cyclone cylinder is fixedly arranged between the upper supporting plate and the lower supporting plate.
The cyclone cylinder is an inverted conical cylinder, and the diameter of the upper port of the cyclone cylinder is 150-500 mm; an overflow pipe is installed at the central part of the upper supporting plate corresponding to the upper port of the cyclone cylinder in a threaded manner, and the bottom end of the overflow pipe extends into the cyclone cylinder.
The lower surface of an upper supporting plate between an upper port of the cyclone cylinder and the overflow pipe is provided with cyclone grooves, guide grooves are symmetrically arranged on the cyclone grooves, and the cyclone cylinder is communicated with an annulus between the cyclone cylinder and the inner pipe through the cyclone grooves and the guide grooves.
The guide grooves are tangentially arranged on the rotational flow grooves, and the number of the guide grooves is 2-10.
The lower supporting plate is provided with sand discharge holes communicated with the cyclone cylinder in a cross shape, and the ends of the sand discharge holes penetrate through the inner pipe, the fixing plate and the outer pipe to be communicated with the outside of the outer pipe.
And circulation holes are uniformly distributed on the lower supporting plate between the sand discharge holes and are communicated with the annular space between the cyclone cylinder and the inner pipe.
And a sealing blocking plate is arranged between the bottom port of the outer pipe and the bottom port of the inner pipe, and nozzles are uniformly distributed on the sealing blocking plate.
A separation method based on a natural gas hydrate downhole cyclone sorting separation device comprises the following steps:
1) firstly, assembling the separation device with an oil pipe and a screw drill to form a tool string, and then descending the tool string into a well;
2) after the drilling fluid is put into a well, the drilling fluid is injected through an oil pipe under the pressure condition of 14-18 MPa; the injected drilling fluid passes through an annular space between the outer pipe and the inner pipe and forms jet flow by the nozzle to be sprayed out, so that the natural gas hydrate and the silt at the sea bottom are sprayed and crushed;
3) after the natural gas hydrate and the silt at the sea bottom are sprayed and crushed by the drilling fluid sprayed at high pressure and high speed, the drilling fluid mixed with the natural gas hydrate and the silt enters the device through the lower port of the inner pipe;
4) the mixed slurry formed by the drilling fluid, the natural gas hydrate and the sediment and entering through the lower port of the inner pipe enters an annular space between the cyclone cylinder and the inner pipe through the circulation hole and then enters the cyclone cylinder through the diversion trench and the cyclone groove;
5) because the diversion trench is tangentially arranged on the cyclone groove, the mixed slurry entering tangentially from the diversion trench forms cyclone along the inner wall of the cyclone cylinder so as to carry out centrifugal separation on the mixed slurry,
6) in the process that the mixed slurry forms rotational flow along the inner wall of the rotational flow cylinder, silt with large density and particle size is thrown to the side wall due to relatively larger centrifugal force, and the natural gas hydrate is close to the center due to relatively smaller density and centrifugal force, namely, solid materials with smaller density and specific gravity and natural gas well drilling fluid return to the ground through the overflow pipe for further treatment; meanwhile, crushing the natural gas hydrate again under the action of fluid shear force in the cyclone separation process, washing the natural gas hydrate, and separating the silt attached to the surface of the natural gas hydrate from the natural gas hydrate again; after separation, the silt with higher density and specific gravity gradually sinks into the sand discharge hole and is discharged out of the separation device, and the silt is backfilled to the seabed, so that the weakening cyclone gel breaking and separation process of the natural gas hydrate is realized through the self-revolution coupling effect of the cyclone separator.
The invention has the beneficial effects that:
the cyclone sorting and separating device can realize sorting of natural gas hydrate and silt particles through the inner pipe, further can enhance the separating effect of the cyclone cylinder, and can obtain purer natural gas hydrate by separating the natural gas hydrate and the silt in situ, thereby effectively improving the mining efficiency and greatly reducing the mining cost; the sediment can be discharged to the seabed again through the sand discharge hole, so that the sediment can be backfilled, and the safety and the reliability during mining are further ensured; the problems of high mining cost and poor safety and reliability of the existing mining mode are solved, and the method is particularly suitable for mining natural gas hydrate.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure in the direction A-A of FIG. 1;
FIG. 3 is a schematic view of the structure in the direction B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view of the lower support plate of the present invention;
FIG. 5 is a schematic bottom view of the present invention;
FIG. 6 is a plot of cyclone diameter versus capacity for the present invention;
FIG. 7 is a micrograph of the appearance of the experimental groups of the present invention at 2mm and 10mm, respectively;
FIG. 8 is a graph showing a particle size distribution of an experimental group of the present invention;
FIG. 9 is a schematic diagram of the structure of the simulated separation experimental apparatus of the present invention;
FIG. 10 is a statistical graph of the separation efficiency of polypropylene powder of the present invention at different flow rates;
FIG. 11 is a statistical chart of the separation efficiency of the silica sand of the present invention at different flow rates.
In the figure: 1. the device comprises an outer pipe, 2, an inner pipe, 3, a fixing plate, 4, a cyclone cylinder, 5, an upper supporting plate, 6, a lower supporting plate, 7, an overflow pipe, 8, a diversion trench, 9, a sand discharge hole, 10, a circulation hole, 11, a nozzle, 12, a cyclone groove, 13, a sealing blocking plate, 14, a screw pump, 15, a water storage tank, 16, a reflux valve, 17, a flowmeter, 18, a pressure gauge, 19, a bypass valve, 20, a main valve, 21, a feeder, 22, a discharge valve, 23, a cyclone sorting separator, 24, a material storage device, 25, a water recovery storage tank, 26 and a water replenishing valve.
Detailed Description
The underground natural gas hydrate cyclone sorting and separating device is composed of an outer pipe 1 and an inner pipe 2, wherein a fixing plate 3 is welded on the inner wall of the outer pipe 1 at intervals, the inner pipe 2 is welded on the fixing plate 3, the inner pipe 2 is connected with the outer pipe 1 in a sleeved mode, drilling fluid is introduced through an annular space between the outer pipe 1 and the inner pipe 2 during work, cementing state slurry of the natural gas hydrate is recovered through the inner pipe 2, the fixing plate 3 is used for isolating the inner pipe 2 from the outer pipe 1 and avoiding mutual friction between the inner pipe 2 and the outer pipe 1, and therefore the inner pipe 2 and the outer pipe 1 are prevented from; the inner pipe 2 and the outer pipe 1 are respectively connected into a whole in a sectional welding mode so as to be convenient for welding the fixing plate 3 with the outer pipe 1 and the inner pipe 2 during assembly; a sealing blocking plate 13 is arranged between the bottom port of the outer pipe 1 and the bottom port of the inner pipe 2, nozzles 11 are uniformly distributed on the sealing blocking plate 13, the sealing blocking plate 13 is used for reducing the flow area of the drilling fluid in cooperation with the nozzles 11, the flow velocity of the drilling fluid is increased when the pressure is unchanged, the drilling fluid is sprayed out at a high speed from the nozzles 11 to form jet flow, and therefore the jet flow of the drilling fluid impacts a natural gas hydrate ore bed, and the natural gas hydrate and silt are crushed to form mixed slurry of the drilling fluid, the natural gas hydrate and the silt; the inner wall of the inner tube 2 is welded with a cyclone separator, the cyclone separator consists of a cyclone cylinder 4, an upper supporting plate 5 and a lower supporting plate 6, the upper supporting plate 5 and the lower supporting plate 6 are fixedly arranged in the inner tube 2 at intervals, and the upper supporting plate 5 and the lower supporting plate 6 are respectively welded with the inner tube 2 so that the cyclone separator is fixed on the inner wall of the inner tube 2; a cyclone cylinder 4 is fixedly arranged between the upper supporting plate 5 and the lower supporting plate 6, the cyclone cylinder 4 is an inverted conical cylinder, the diameter of the upper port of the cyclone cylinder is 150 plus 500mm, the separation precision and the production capacity of the cyclone separator are closely related to the nominal diameter of the cyclone separator, and for the collection of natural gas hydrates, through simulation research, when the diameter of the upper port of the cyclone cylinder 4 is 150 plus 500mm, the separation effect and the production capacity are optimal (see fig. 6); an overflow pipe 7 is arranged at the central part of the upper support plate 5 corresponding to the upper port of the cyclone cylinder 4 in a threaded manner, and the bottom end of the overflow pipe 7 extends into the cyclone cylinder 4; the lower surface of an upper support plate 5 between an upper port of the cyclone cylinder 4 and the overflow pipe 7 is provided with cyclone grooves 12, guide grooves 8 are symmetrically arranged on the cyclone grooves 12, the guide grooves 8 are tangentially arranged on the cyclone grooves 12, the number of the guide grooves 8 is 2-10, the cyclone cylinder 4 is communicated with the annulus between the cyclone cylinder 4 and the inner pipe 2 through the cyclone grooves 12 and the guide grooves 8, the guide grooves 8 are matched with the cyclone grooves 12 to ensure that mixed slurry enters the cyclone cylinder 4 through the annulus between the cyclone cylinder 4 and the inner pipe 2 and through the guide grooves 8 and the cyclone grooves 12 in the process of exploiting the natural gas hydrate, so that the mixed slurry is guided into the cyclone cylinder 4 through the guide grooves 8 and the cyclone grooves 12, and the mixed slurry is guided into the cyclone cylinder 4 through the guide grooves 8 tangentially arranged on the cyclone grooves 12, the mixed slurry has a tangential speed relative to the cyclone groove 12, so that cyclone can be formed after the mixed slurry enters the cyclone cylinder 4, and natural gas hydrate and silt in the mixed slurry are separated; the lower supporting plate 6 is provided with sand discharge holes 9 communicated with the cyclone cylinder 4 in a cross shape, the ends of the sand discharge holes 9 penetrate through the inner pipe 2, the fixing plate 3 and the outer pipe 1 to be communicated with the outside of the outer pipe 1, and the sand discharge holes 9 are used for discharging silt with high specific gravity through the sand discharge holes 9 in the cyclone separation process, so that the silt is backfilled to the seabed, the seabed is not easy to collapse due to excavation in the mining process, and the safety and the reliability in the mining process are further ensured; circulation holes 10 are uniformly distributed on the lower support plate 6 between the sand discharge holes 9, the circulation holes 10 are communicated with the annular space between the cyclone cylinder 4 and the inner pipe 2, so that the mixed slurry can sequentially pass through the circulation holes 10, the annular space between the cyclone cylinder 4 and the inner pipe 2, the guide groove 8 and the cyclone groove 12 to enter the cyclone cylinder 4; in the process that the mixed slurry enters the cyclone cylinder 4 through the annular space between the cyclone cylinder 4 and the inner pipe 2 and the guide grooves 8 and the cyclone grooves 12, the guide grooves 8 and the cyclone grooves 12 can realize the sequencing of materials with different densities and particle sizes, namely, the material density and the particle size are different, the materials are different relative to the buoyancy of the mixed slurry, the buoyancy of the materials is different, the moving speeds of the materials in the mixed slurry are different, the sequencing of the materials with different densities and particle sizes is realized, and the separation efficiency of the natural gas hydrate can be effectively improved.
The separation method based on the natural gas hydrate downhole cyclone sorting separation device comprises the following steps:
firstly, assembling the upper end of the separation device with an oil pipe and a screw drill to form a tool string, and then descending the tool string into a well;
after the drilling fluid is put into a well, the drilling fluid is injected through an oil pipe under the pressure condition of 14-18 MPa; the injected drilling fluid passes through an annular space between the outer pipe 1 and the inner pipe 2 and is jetted out by a nozzle, so that natural gas hydrate and silt at the sea bottom are jetted and crushed, the drilling fluid, the natural gas hydrate and the silt form mixed slurry which is easy to flow, the natural gas hydrate and the silt have fluidity, and the separation of the natural gas hydrate and the silt is facilitated; after the natural gas hydrate and the silt at the sea bottom are sprayed and crushed by the high-pressure and high-speed sprayed drilling fluid, the drilling fluid is mixed with the natural gas hydrate and the silt to enter the device through the lower port of the inner pipe 2, so that the natural gas hydrate and the silt are subjected to in-situ separation through the device to obtain relatively pure natural gas hydrate, the silt is backfilled to the sea bottom, collapse in the mining process is avoided, and safety and reliability are guaranteed.
The mixed slurry formed by the drilling fluid, the natural gas hydrate and the sediment and entering through the lower port of the inner pipe 2 enters an annular space between the cyclone tube 4 and the inner pipe 2 through the circulation hole and then enters the cyclone tube 4 through the diversion trench 8 and the cyclone groove 12; because the diversion trench 8 is tangentially arranged on the cyclone groove 12, the mixed slurry entering tangentially from the diversion trench 8 forms a cyclone on the cyclone cylinder 4 along the inner wall thereof so as to carry out centrifugal separation on the mixed slurry, when the mixed slurry forms a cyclone on the cyclone cylinder 4 along the inner wall thereof, silt with large density and grain size is thrown to the side wall due to relatively larger centrifugal force, and the natural gas hydrate is relatively smaller and closer to the center due to density and centrifugal force, namely, solid materials with smaller density and specific gravity and natural gas well drilling fluid return to the ground through the overflow pipe 7 for further treatment; meanwhile, the natural gas hydrate is crushed again under the action of fluid shear force in the cyclone separation process, the drilling fluid repeatedly washes the natural gas hydrate in the cyclone separation process to wash the natural gas hydrate, silt attached to the surface of the natural gas hydrate is separated from the natural gas hydrate again, and the diversion trench 8 is tangentially arranged on the cyclone groove 12, so that the diversion trench 8 can guide the mixed slurry to enter the cyclone cylinder 4 at a small angle (axial angle), the mixed slurry can be retained in the cyclone cylinder 4 for a long time, and the re-gel breaking process and the re-separation process of the natural gas hydrate under the action of the fluid shear force are strengthened; after separation, the silt with higher density and specific gravity gradually sinks into the sand discharge hole 9 and is discharged out of the separation device, and the silt is backfilled to the seabed, so that the weakening cyclone gel breaking and separation process of the natural gas hydrate is realized through the revolution coupling effect of the cyclone separator.
In order to verify the separation effect of the natural gas hydrate, the inventor simulates the actual working conditions in the exploitation process to carry out the following experiments on the separation of the natural gas hydrate:
materials and Experimental conditions
According to the physical properties of natural gas hydrate obtained by trial production of middle sea oil at 1310m deep water and 117-; the density of quartz sand selected in the experiment is 2510kg/m3, and the median particle size is 70.4 microns; PP had a density of 910kg/m3 and a median particle size of 47.6 microns.
The natural gas hydrate simulant materials of 4 groups of materials with different cementing strengths were made by different proportions of quartz sand and PP. The KQ-3 type particle strength tester is used for testing the compressive strength of the material, and the higher the content of the quartz sand is, the higher the compressive strength is and the better the cementation degree is; meanwhile, particle size distribution measurement was performed using a malvern laser particle sizer (see table 1, fig. 7, and fig. 8).
Table 14 experimental groups of different bond strengths
Experimental apparatus and procedure
In order to research the separation effect of the cyclone sorting separation device on natural gas hydrate simulators with different cementing strengths under different flow rates, a simulated separation experimental device is designed:
the simulated separation experimental device consists of a screw pump 14, a cyclone sorting separator 23, a material storage tank 24 and a feeder 21, wherein the inlet of the screw pump 14 is connected with a water storage tank 15, the outlet of the screw pump 14 is connected with the cyclone sorting separator 23 through a connecting main pipe, the underflow port of the cyclone sorting separator 23 is connected with the material storage tank 24, and the overflow port of the cyclone sorting separator 23 is connected with a water recovery storage tank 25; the connecting main pipe is provided with a flowmeter 17, and the connecting main pipe at one side of the flowmeter 17 is connected with the top of the water storage tank 15 through a reflux valve 16; a pressure gauge 18 is arranged on the connecting main pipe at the other side of the flowmeter 17; a feeder 21 is arranged on a main connecting pipe between the pressure gauge 18 and the cyclone sorting separator 23, the bottom outlet of the feeder 21 is connected with the main connecting pipe through a discharge valve 22, and the upper inlet of the feeder 21 is connected with the main connecting pipe through a bypass valve 19; a main valve 20 is provided in the main pipe connecting the bypass valve 19 and the discharge valve 22 (see fig. 9).
The experiment is a continuous experiment, a bottom flow port of the cyclone sorting separator 23 is connected with the material storage device 24 for recycling materials after cyclone gel breaking separation, and an overflow port of the cyclone sorting separator 23 is discharged, purified and recycled; before the experiment runs, materials are added into a feeder 21, a main valve 20 is fully opened after the materials are added, a bypass valve 19 and a discharge valve 22 are kept closed, a screw pump 14 is started, and the flow of the screw pump 14 is adjusted through a return valve 16; the simulated separation experimental apparatus starts feeding after operating stably for 10 minutes: opening the discharge valve 22, the bypass valve 19 in sequence, and slowly adjusting the main valve 20 to allow water flow into the feeder 21; after 5 minutes of stable operation, the main valve 20 is slowly closed, water completely flows into the feeder 21 to flush the feeder, materials in the feeder 21 completely enter the cyclone sequencing separator 23 to carry out cyclone gel breaking separation, a part of the separated materials and water enter the material storage device 24 through a bottom flow port of the cyclone sequencing separator 23, the other part of the separated materials and water enter the water recovery storage tank 25 through an overflow port of the cyclone sequencing separator 23, and the screw pump 14 is shut down after 10 minutes of separation and operation (see fig. 9).
Firstly, carrying out suction filtration on the materials captured in the material storage device 24 by using a vacuum suction filter, wherein the vacuum suction filter adopts a Shanghai Xinya 50 x 0.22 water system microporous filter membrane; after suction filtration and drying, the mixture is put into an oven at 100 ℃ for drying for 8h, then the mixture is moved into a dryer for drying for 30 minutes, then the mixture is taken out, an electronic analytical balance with the measurement precision of 0.0001g is used for weighing, and the separation efficiency is calculated.
Results and analysis of the experiments
At a flow velocity of 0.8m3H and 1.2m3At the time of/h, the separation effect of the polypropylene powder is higher than 99 percent, and the inlet flow rate is largerThe larger the inlet tangential force is, the slightly increased separation effect is achieved; meanwhile, for the four bond strengths, the separation effect was higher than 99%, and the lower the bond strength, the better the separation effect (see fig. 10).
The separation effect of the quartz sand was higher than 93% for the samples with different flow rates and cementing strengths (see fig. 11).
According to the experiment, the cyclone sorting and separating device can well separate the natural gas hydrate from the sediment, is beneficial to purifying and recovering the natural gas hydrate, can effectively solve the exploitation risks such as sand blockage or seabed collapse caused by seabed silt, and can effectively improve the safety and the reliability.
The cyclone sorting and separating device can realize sorting of natural gas hydrate and silt particles and can carry out in-situ separation on the natural gas hydrate and the silt, so that purer natural gas hydrate can be obtained, the exploitation efficiency can be effectively improved, and the exploitation cost is greatly reduced; the sediment can be discharged to the seabed again through the sand discharge hole 9, so that the sediment can be backfilled, and the safety and the reliability during mining can be further ensured; the problems of high mining cost and poor safety and reliability of the existing mining mode are solved, and the method is particularly suitable for mining natural gas hydrate.
Claims (8)
1. The utility model provides a natural gas hydrate is whirl sequencing separator in pit, it comprises outer tube (1) and inner tube (2), its characterized in that: the inner pipe (2) is installed in the outer pipe (1) through fixed plates (3) arranged at intervals, and a cyclone separator is welded on the inner wall of the inner pipe (2).
2. A natural gas hydrate downhole cyclone sorting separation device according to claim 1, wherein: the cyclone separator comprises a cyclone cylinder (4), an upper supporting plate (5) and a lower supporting plate (6), the upper supporting plate (5) and the lower supporting plate (6) are fixedly arranged in the inner tube (2) at intervals, and the cyclone cylinder (4) is fixedly arranged between the upper supporting plate (5) and the lower supporting plate (6).
3. A natural gas hydrate downhole cyclone sorting separation device according to claim 2, wherein: the cyclone cylinder (4) is an inverted conical cylinder, and the diameter of the upper end port of the cyclone cylinder is 150 mm and 500 mm; an overflow pipe (7) is installed at the central part of the upper supporting plate (5) corresponding to the upper port of the cyclone cylinder (4) in a threaded manner, and the bottom end of the overflow pipe (7) extends into the cyclone cylinder (4).
4. A natural gas hydrate downhole cyclone sorting and separating device according to claim 3, wherein: the cyclone cylinder is characterized in that a cyclone groove (12) is formed in the lower surface of an upper supporting plate (5) between the upper port of the cyclone cylinder (4) and the overflow pipe (7), guide grooves (8) are symmetrically formed in the cyclone groove (12), and the cyclone cylinder (4) is communicated with the annular space between the cyclone cylinder (4) and the inner pipe (2) through the cyclone groove (12) and the guide grooves (8).
5. A natural gas hydrate downhole cyclone sorting and separating device according to claim 4, wherein: the guide grooves (8) are tangentially arranged on the rotational flow grooves (12), and the number of the guide grooves (8) is 2-10.
6. A natural gas hydrate downhole cyclone sorting separation device according to claim 2, wherein: the lower supporting plate (6) is provided with sand discharge holes (9) communicated with the cyclone cylinder (4) in a cross shape, and the ends of the sand discharge holes (9) penetrate through the inner pipe (2), the fixing plate (3) and the outer pipe (1) to be communicated with the outside of the outer pipe (1).
7. A natural gas hydrate downhole cyclone sorting and separating device according to claim 6, wherein: and circulation holes (10) are uniformly distributed on the lower supporting plate (6) between the sand discharge holes (9), and the circulation holes (10) are communicated with an annulus between the cyclone cylinder (4) and the inner pipe (2).
8. A natural gas hydrate downhole cyclone sorting separation device according to claim 1, wherein: and a sealing blocking plate (13) is arranged between the bottom port of the outer pipe (1) and the bottom port of the inner pipe (2), and nozzles (11) are uniformly distributed on the sealing blocking plate (13).
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| CN202110420314.7A CN113090245B (en) | 2021-04-19 | 2021-04-19 | Underground rotational flow sorting and separating device and method for natural gas hydrate |
| PCT/CN2021/114196 WO2022222333A1 (en) | 2021-04-19 | 2021-08-24 | Sorting and separating device and method for natural gas hydrate underground cyclone |
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| CN202110420314.7A CN113090245B (en) | 2021-04-19 | 2021-04-19 | Underground rotational flow sorting and separating device and method for natural gas hydrate |
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| CN114687710A (en) * | 2022-03-30 | 2022-07-01 | 西南石油大学 | High-efficient separation degritting backfill device of thermal decomposition under water |
| CN114961662A (en) * | 2022-04-21 | 2022-08-30 | 宜宾学院 | Cyclone series double-layer tubular hydrate in-situ separation device |
| WO2022222333A1 (en) * | 2021-04-19 | 2022-10-27 | 华东理工大学 | Sorting and separating device and method for natural gas hydrate underground cyclone |
| CN116291361A (en) * | 2023-04-06 | 2023-06-23 | 西南石油大学 | Underground power sand removal tool |
| CN116517511A (en) * | 2023-07-03 | 2023-08-01 | 辽宁高盛新能源有限公司 | Exploitation device of natural gas hydrate for multi-branch well |
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| WO2022222333A1 (en) | 2022-10-27 |
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