CN108590622B - Natural gas hydrate underground separation device with vortex generator - Google Patents
Natural gas hydrate underground separation device with vortex generator Download PDFInfo
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- CN108590622B CN108590622B CN201810421600.3A CN201810421600A CN108590622B CN 108590622 B CN108590622 B CN 108590622B CN 201810421600 A CN201810421600 A CN 201810421600A CN 108590622 B CN108590622 B CN 108590622B
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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 44
- 238000000926 separation method Methods 0.000 title claims abstract description 37
- 210000002445 nipple Anatomy 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000011268 mixed slurry Substances 0.000 claims abstract description 23
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims description 67
- 238000007599 discharging Methods 0.000 claims description 15
- 238000005243 fluidization Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 natural gas hydrates Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Cyclones (AREA)
Abstract
The invention discloses a natural gas hydrate underground separation device with an eddy generator, which comprises an upper joint, a separator nipple, the eddy generator, a separator and a lower joint, wherein the separator nipple is arranged on the upper joint; the upper end of the upper joint is connected with other tools, the lower end of the upper joint is connected with the upper end of the separator nipple, the lower end of the separator nipple is connected with the upper end of the lower joint, and the lower end of the lower joint is connected with other tools; the separator nipple is divided into an inner pipe and an outer pipe, wherein an upper hanging head, an upper fixing cylinder, an upper fixing disc, a lower fixing cylinder, a lower hanging head, a vortex generator and a separator are arranged in the inner pipe; the annular space of the upper joint, the separator nipple and the lower joint is a liquid inlet channel for hydrate exploitation, the inner cavities of the separator nipple and the lower joint are liquid return channels for mixed slurry, and the inner cavity of the upper joint is a liquid return channel for hydrate slurry. The invention has the following advantages: the energy loss generated by the impact of the mixed slurry is reduced; the pressure drop is reduced, so that the flowing state of the mixed slurry is more stable; can be matched with other tools for use, and has flexible application.
Description
Technical Field
The invention relates to the technical field of exploitation of seabed natural gas hydrates, in particular to a natural gas hydrate underground separation device with a vortex generator.
Background
Natural gas hydrate is also called as 'combustible ice', and is a 'cage compound' formed by hydrocarbon gas mainly comprising methane and water under certain temperature and pressure conditions, and has a white crystalline structure. The carbon content of the fuel is twice of the total energy reserves of coal, petroleum, natural gas and the like known in the world. Therefore, natural gas hydrate, particularly marine natural gas hydrate, is widely considered to be a novel clean energy resource for replacing coal, petroleum and natural gas in the 21 st century, and is a new energy with large reserves which are not yet developed at present. The submarine natural gas hydrate reservoir has huge reserves, and the development and the utilization of the submarine natural gas hydrate reservoir are important strategic fields for realizing the sustainable development of energy and guaranteeing the national energy safety.
In the middle 5 th 2017, the solid-state fluidization test production project of the ocean weakly cemented and non-diagenetic hydrate starts to test production and successfully ignites in the sea area of the south China sea shenhu for the first time. The solid state fluidization exploitation is to break the solid state hydrate layer by jet breaking mode without changing the temperature and pressure of the reservoir layer, collect the fluidized mixed slurry, then continuously return to the underground separator to separate hydrate and mud sand, the hydrate slurry is conveyed to the sea surface by the continuous double-layer pipe, the separated mud sand is backfilled to solidify the exploitation layer, and the exploitation layer is prevented from collapsing. The separation effect of the underground separation device has important influence on the service life of equipment in the exploitation process. Therefore, the underground separation device has important engineering significance for the exploitation of the seabed natural gas hydrate. The existing underground separation device applied to hydrate solid-state fluidization exploitation is not provided with a silt backfill channel, and has the problems of high pressure drop, high energy consumption, low separation efficiency and the like.
Aiming at the defects and the vacancies existing in the prior art, the invention provides a natural gas hydrate underground separation device with a vortex generator.
Disclosure of Invention
The invention provides a natural gas hydrate underground separation device with a vortex generator, aiming at the defects of the underground separation device in the existing technology for exploiting submarine natural gas hydrate.
The utility model provides a take vortex generator's natural gas hydrate separator in pit which characterized in that: comprises an upper joint, a separator nipple, a vortex generator, a separator and a lower joint; the upper end of the upper joint is in threaded connection with other tools, and the lower end of the upper joint is in threaded connection with the upper end of the separator nipple; the separator nipple is divided into an inner pipe and an outer pipe, an upper fixing disc, an upper fixing cylinder and an upper hanging head for axially positioning and righting a straight cylinder section of the separator are arranged at the upper part in the inner pipe, a lower fixing disc, a lower fixing cylinder and a lower hanging head for axially positioning and righting a cone cylinder section of the separator are arranged at the lower part in the inner pipe, the upper end of the separator nipple is in threaded connection with the lower end of the upper joint, and the lower end of the separator nipple is in threaded connection with the upper end of the lower joint; the lower joint is internally provided with a sand discharge cylinder, a sand discharge channel is arranged in the sand discharge cylinder, an inner opening of the sand discharge channel is connected with a sand discharge pipe in the separator, a discharge outlet at the outer end is used for being connected with a sand conveying device for backfilling mud sand, the upper end of the lower joint is in threaded connection with the lower end of the short joint of the separator, and the lower end of the lower joint is in threaded connection with other tools; the vortex generator is arranged in the inner pipe of the separator nipple, an inlet of the vortex generator is connected with the spiral pipe in a spiral tangential mode, the upper end of the vortex generator is connected with the upper hanging head in a threaded mode, and the lower end of the vortex generator is connected with the upper end of the separator through a bolt A and a nut A; the separator is arranged in an inner pipe of the short section of the separator, an overflow pipe in the separator is provided with an external thread A and is connected with the end cover, and the lower end of a sand discharge pipe in the separator is provided with an external thread B and is connected with an inner port of the sand discharge channel; the annular space of the upper joint, the separator nipple and the lower joint is a liquid inlet channel for exploiting the seabed natural gas hydrate, the inner cavities of the separator nipple and the lower joint are liquid return channels for mixing slurry, and the inner cavity of the upper joint is a liquid return channel for hydrate slurry.
In a further technical scheme, the upper joint is of a double-layer structure and comprises an inner joint A and an outer joint A, wherein the inner joint A and the outer joint A are connected by virtue of a rib plate A, an external thread C is arranged at the upper end of the inner joint A, an external thread D is arranged at the upper end of the outer joint A, the upper end of the upper joint is in threaded connection with other tools, an internal thread A is arranged at the lower end of the inner joint A, an internal thread B is arranged at the lower end of the outer joint A, and the lower end of the upper joint is in threaded connection with the upper end of a short joint of the separator; the annular space of the upper joint is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the upper joint is a liquid return channel for hydrate slurry.
In a further technical scheme, the separator nipple comprises an inner pipe and an outer pipe, wherein an external thread E is arranged at the upper end of the inner pipe and is connected with the lower end of an inner joint A of the upper joint, an external thread F is arranged at the upper end of the outer pipe and is connected with the lower end of an outer joint A of the upper joint, an external thread G is arranged at the lower end of the inner pipe and is connected with the upper end of an inner joint B of the lower joint, and an external thread H is arranged at the lower end of the outer pipe and is connected with the upper end of an outer joint B of the lower joint; the annulus of the separator nipple is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the inner tube is a liquid return channel for mixing slurry.
In a further technical scheme, the inner tube is of a double-head concave hole structure, an upper fixing disc is embedded in a concave hole at the upper part of the inner tube, an upper fixing cylinder for axially positioning the upper fixing disc is arranged at the upper end of the upper fixing cylinder, and an upper hanging head for limiting the axial movement of the upper fixing cylinder is arranged at the upper end of the upper fixing cylinder; the lower fixing disc is embedded in the concave hole at the lower part of the inner tube, the lower end of the lower fixing disc is a lower fixing cylinder for axially positioning the lower fixing disc, and the lower end of the lower fixing cylinder is a lower hanging head for limiting the axial movement of the lower fixing cylinder.
In a further technical scheme, a fixing hole A for sleeving and firmly fixing a straight barrel section of the separator is formed in the center of the upper fixing plate, two connecting bases are arranged on the upper fixing plate, a feeding hole is formed in each connecting base, four connecting holes are formed in the periphery of the feeding hole, a pipe orifice of a spiral pipe is opposite to the feeding hole, and the spiral pipe is connected with the connecting bases through bolts B and nuts B; four spokes A are arranged between a fixing hole A in the upper fixing disc and the outer ring A for connection, and through holes A between the spokes A are liquid return channels for mixing slurry; the center of the lower fixed disc is provided with a fixed hole B for sleeving and firmly fixing the conical section of the separator, four spokes B are arranged between the fixed hole B and the outer ring B in the lower fixed disc and are connected, and through holes B between the spokes B are liquid return channels for mixing slurry; the center of the upper hanging head is provided with a threaded hole A, the threaded hole A of the upper hanging head is in threaded connection with the upper end of the end cover of the vortex generator, and the upper hanging head is provided with an external thread I which is connected with an internal thread F at the upper end of the inner pipe; the center of the lower hanging head is provided with a threaded hole B, the threaded hole B of the lower hanging head is connected with an external thread J on the upper part of a sand discharge pipe in the separator, four through holes C for mixing slurry liquid return are formed in the periphery of the threaded hole B, and the lower hanging head is in threaded connection with the lower end of the inner pipe.
In a further technical scheme, the vortex generator is arranged in an inner tube of the short section of the separator and comprises an end cover, an outer tube and double-head helical blades, wherein the lower end of the end cover is connected with the upper end of the outer tube through screws, an external thread K is arranged at the upper end of the end cover and connected with an upper hanging head, an internal threaded hole for connecting an overflow tube of the separator is arranged at the center of the end cover, a bolt A and a nut A are arranged at the upper end of a straight tube section of the outer tube and are connected with the lower end of the separator, the double-head helical blades are arranged outside the overflow tube, and the upper port of each head of each double-head helical blade is opposite to a tangential outlet of the helical tube.
In a further technical scheme, the separator is arranged in an inner pipe of the separator nipple, the separator is arranged at the lower end of the vortex generator, an overflow pipe in the separator is provided with an external thread A and is connected with the end cover, and the lower end of a sand discharge pipe in the separator is provided with an external thread B and is connected with an inner port of the sand discharge channel.
In a further technical scheme, the lower joint is of a double-layer structure and comprises an inner joint B and an outer joint B, and the inner joint B and the outer joint B are connected by virtue of a sand discharge cylinder and a rib plate B; the upper end of the inner joint B is provided with an internal thread C which is connected with the lower end of the inner pipe of the separator nipple, the upper end of the outer joint B is provided with an internal thread D which is connected with the lower end of the outer pipe of the separator nipple, the lower end of the inner joint B is provided with an external thread L, the lower end of the outer joint B is provided with an external thread M, and the lower end of the lower joint is connected with other tools in a threaded manner; a sand discharging channel is arranged in the sand discharging cylinder, an inner opening of the sand discharging channel is provided with an inner thread E which is connected with a sand discharging pipe, and a discharge outlet at the outer end is used for being connected with a sand conveying device for backfilling mud sand; the annulus of the lower joint is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the lower joint is a liquid return channel for mixing slurry.
Compared with the prior art, the invention has the following beneficial effects: (1) The natural gas hydrate underground separation device with the vortex generator provided by the invention effectively realizes the reduction of pressure drop, short-circuit flow and energy consumption in the underground separation device, and improves the processing capacity of the underground separation device; (2) According to the underground separation device with the vortex generator, the double-end helical blades in the vortex generator are tangentially opposite to one helical pipe, so that the energy loss caused by fluid impact is reduced, and the fluid flowing state is more stable; (3) The underground separating device with the vortex generator is provided with the upper connector and the lower connector, can be matched with other tools for use, and is convenient to install and flexible to apply.
Drawings
FIG. 1 is a cross-sectional view of a natural gas hydrate downhole separation device with vortex generator according to the present invention;
FIG. 2 is a schematic view of a partial opening of a natural gas hydrate downhole separation device with vortex generator according to the present invention;
FIG. 3 is a cross-sectional view of A-A of a downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 4 is a cross-sectional view of a downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 5 is a schematic diagram of the structure of a lower hanger in a natural gas hydrate downhole separation device with vortex generator according to the present invention;
FIG. 6 is a cross-sectional view of the lower hanger head of the downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 7 is a schematic view of the structure of an upper stationary plate in a downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 8 is a schematic diagram of the structure of a lower stationary disc in a natural gas hydrate downhole separation device with vortex generator according to the present invention;
FIG. 9 is a schematic diagram of the structure of an upper joint in a downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 10 is a D-D cross-sectional view of an upper sub in a natural gas hydrate downhole separation device with vortex generators in accordance with the present invention;
FIG. 11 is a schematic view of the structure of a lower joint in a downhole separation device for natural gas hydrate with vortex generator according to the present invention;
FIG. 12 is an E-E cross-sectional view of a lower sub in a natural gas hydrate downhole separation device with vortex generators in accordance with the present invention.
In the above figures, the reference numerals correspond to the component names as follows:
1-upper joint, 2-separator nipple, 3-vortex generator, 4-separator, 5-lower joint, 6-inner tube, 7-outer tube, 8-straight tube section, 9-upper fixed disk, 10-upper fixed tube, 11-upper hanging head, 12-cone tube section, 13-lower fixed disk, 14-lower fixed tube, 15-lower hanging head, 16-sand discharge tube, 17-sand discharge channel, 18-inner port, 19-sand discharge tube, 20-discharge port, 21-spiral tube, 22-bolt A, 23-nut A, 24-overflow tube, 25-external thread A, 26-end cap, 27-external thread B, 28-inner joint A, 29-external joint A, 30-rib A, 31-external thread C, 32-external threads D, 33-internal threads A, 34-internal threads B, 35-external threads E, 36-external threads F, 37-external threads G, 38-internal joint B, 39-external threads H, 40-external joint B, 41-fixed hole A, 42-connection base, 43-external ring A, 44-spoke A, 45-through hole A, 46-fixed hole B, 47-external ring B, 48-spoke B, 49-through hole B, 50-threaded hole A, 51-external threads I, 52-internal threads F, 53-threaded hole B, 54-external threads J, 55-through hole C, 56-external cylinder, 57-double-ended screw blade, 58-screw, 59-external threads K, 60-internal threaded hole, 61-ribbed plate B, 62-internal threads C, 63-internal threads D, 64-external threads L, 65-external threads M, 66-internal threads E, 67-feed opening, 68-threaded hole, 69-bolt B, 70-nut B, 71-bolt C, 72-nut C, 73-bolt D, 74-nut D.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples, embodiments of which include, but are not limited to, the following examples.
Examples
The invention relates to a natural gas hydrate underground separation device with a vortex generator, which is shown in figures 1 to 12, and comprises an upper joint 1, a separator nipple 2, a vortex generator 3, a separator 4 and a lower joint 5; the upper end of the upper joint 1 is in threaded connection with other tools, and the lower end of the upper joint 1 is in threaded connection with the upper end of the separator nipple 2; the separator nipple 2 is divided into an inner pipe 6 and an outer pipe 7, an upper fixing disc 9, an upper fixing cylinder 10 and an upper hanging head 11 for axially positioning and righting a straight cylinder section 8 of the separator 4 are arranged at the upper part in the inner pipe 6, a lower fixing disc 13, a lower fixing cylinder 14 and a lower hanging head 15 for axially positioning and righting a cone cylinder section 12 of the separator 4 are arranged at the lower part in the inner pipe 6, the upper end of the separator nipple 2 is in threaded connection with the lower end of the upper joint 1, and the lower end of the separator nipple 2 is in threaded connection with the upper end of the lower joint 5; the lower joint 5 is internally provided with a sand discharge cylinder 16, a sand discharge channel 17 is arranged in the sand discharge cylinder 16, an inner opening 18 of the sand discharge channel 17 is connected with a sand discharge pipe 19 in the separator 4, an exhaust outlet 20 at the outer end is used for being connected with a sand conveying device for backfilling mud sand, the upper end of the lower joint 5 is in threaded connection with the lower end of the separator nipple 2, and the lower end of the lower joint 5 is in threaded connection with other tools; the vortex generator 3 is arranged in the inner pipe 6 of the separator nipple 2, an inlet of the vortex generator 3 is spirally and tangentially connected with the spiral pipe 21, the upper end of the vortex generator 3 is in threaded connection with the upper hanging head 11, and the lower end of the vortex generator 3 is connected with the upper end of the separator 4 through a bolt A22 and a nut A23; the separator 4 is arranged in the inner pipe 6 of the separator nipple 2, the overflow pipe 24 in the separator 4 is provided with an external thread A25 which is connected with the end cover 26, and the lower end of the sand discharge pipe 19 in the separator 4 is provided with an external thread B27 which is connected with the inner port 18 of the sand discharge channel 17; the annular space of the upper joint 1, the separator nipple 2 and the lower joint 5 is a liquid inlet channel for exploiting the seabed natural gas hydrate, the inner cavities of the separator nipple 2 and the lower joint 5 are liquid return channels for mixing slurry, and the inner cavity of the upper joint 1 is a liquid return channel for hydrate slurry.
As shown in fig. 2, 9 and 10, the upper joint 1 has a double-layer structure, and comprises an inner joint a28 and an outer joint a29, wherein the inner joint a28 and the outer joint a29 are connected by virtue of a rib plate a30, an external thread C31 is arranged at the upper end of the inner joint a28, an external thread D32 is arranged at the upper end of the outer joint a29, the upper end of the upper joint 1 is in threaded connection with other tools, an internal thread a33 is arranged at the lower end of the inner joint a28, an internal thread B34 is arranged at the lower end of the outer joint a29, and the lower end of the upper joint 1 is in threaded connection with the upper end of the separator nipple 2; the annular space of the upper joint 1 is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the upper joint 1 is a liquid return channel for hydrate slurry.
As shown in fig. 1 to 2, the separator nipple 2 comprises an inner pipe 6 and an outer pipe 7, wherein an external thread E35 is arranged at the upper end of the inner pipe 6 and is connected with the lower end of an inner joint a28 of the upper joint 1, an external thread F36 is arranged at the upper end of the outer pipe 7 and is connected with the lower end of an external joint a29 of the upper joint 1, an external thread G37 is arranged at the lower end of the inner pipe 6 and is connected with the upper end of an inner joint B38 of the lower joint 5, and an external thread H39 is arranged at the lower end of the outer pipe 7 and is connected with the upper end of an external joint B40 of the lower joint 5; the annulus of the separator nipple 2 is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the inner tube 6 is a liquid return channel for mixing slurry.
As shown in fig. 1, the inner tube 6 has a double-end concave hole structure, an upper fixing disk 9 is embedded in a concave hole at the upper part of the inner tube 6, an upper fixing cylinder 10 for axially positioning the upper fixing disk 9 is arranged at the upper end of the upper fixing disk 9, and an upper hanging head 11 for limiting the axial movement of the upper fixing cylinder 10 is arranged at the upper end of the upper fixing cylinder 10; the lower fixing disc 13 is embedded in the concave hole at the lower part of the inner tube 6, the lower end of the lower fixing disc 13 is provided with a lower fixing cylinder 14 for axially positioning the lower fixing disc 13, and the lower end of the lower fixing cylinder 14 is provided with a lower hanging head 15 for limiting the axial movement of the lower fixing cylinder 14.
As shown in fig. 1, 5, 6, 7 and 8, the center of the upper fixing plate 9 is provided with a fixing hole a41 for sleeving the straight section 8 in the separator 4, the upper fixing plate 9 is provided with two connecting bases 42, a feeding hole 67 is arranged in the connecting bases 42, four connecting holes 68 are arranged around the feeding hole 67, the pipe orifice of the spiral pipe 21 is opposite to the feeding hole 67, and the spiral pipe 21 is connected with the connecting bases 42 by bolts B69 and B70; four spokes A44 are arranged between a fixing hole A41 and an outer ring A43 in the upper fixing disc 9 and connected, and through holes A45 between the spokes A44 are liquid return channels for mixing slurry; the center of the lower fixed disk 13 is provided with a fixed hole B46 for sleeving the conical section 12 of the separator 4, four spokes B48 are arranged between the fixed hole B46 and the outer ring B47 in the lower fixed disk 13 for connection, and through holes B49 between the spokes B48 are liquid return channels for mixed slurry; the center of the upper hanging head 11 is provided with a threaded hole A50, the threaded hole A50 of the upper hanging head 11 is in threaded connection with the upper end of the end cover 26 of the vortex generator 3, and the upper hanging head 11 is provided with an external thread I51 which is connected with an internal thread F52 at the upper end of the inner tube 6; the center of the lower hanging head 15 is provided with a threaded hole B53, the threaded hole B53 of the lower hanging head 15 is connected with an external thread J54 at the upper part of the sand discharge pipe 19 in the separator 4, four through holes C55 for mixing slurry liquid return are formed around the threaded hole B53, and the lower hanging head 15 is in threaded connection with the lower end of the inner pipe 6.
As shown in fig. 1 to 2, the vortex generator 3 is disposed in the inner tube 6 of the separator nipple 2, and includes an end cover 26, an outer tube 56 and double-end helical blades 57, the lower end of the end cover 26 is connected with the upper end of the outer tube 56 by a screw 58, the upper end of the end cover 26 is provided with an external screw thread K59 connected with the upper hanging head 11, the center of the end cover 26 is provided with an internal screw hole 60 for connecting the overflow tube 24 of the separator 4, the lower end of the outer tube 56 is connected with the upper end of the straight tube section 8 of the separator 4 by a bolt a22 and a nut a23, the double-end helical blades 57 are disposed outside the overflow tube 24, the upper end port of each end of the double-end helical blades 57 is opposite to the tangential outlet of the helical tube 21, the linear motion is changed into the helical motion under the guiding action of the double-end helical blades 57, the energy loss caused by the mixed slurry entering the separator 4 and impacting the wall is reduced, the short-circuit flow is reduced, the double-end helical blades 57 also make the flow state of the mixed slurry more stable, and the pressure drop of the separator is reduced.
As shown in fig. 1 to 2, the separator 4 is arranged in the inner tube 6 of the separator nipple 2, the separator 4 is arranged at the lower end of the vortex generator 3, and the straight tube section 8 in the separator 4 is connected with the outer tube 56 in the vortex generator 3 through a bolt A22 and a nut A23; the lower part of the straight cylinder section 8 in the separator 4 is provided with a cone cylinder section 12 which is connected by a bolt C71 and a nut C72; the lower part of the cone section 12 in the separator 4 is provided with a sand discharge pipe 19 which is connected by a bolt D73 and a nut D74; an external thread B27 is arranged at the lower end of the sand discharge pipe 19 in the separator 4 and is connected with the inner port 18 of the sand discharge channel 17; the overflow pipe 24 in the separator 4 is provided with external threads 25A connected to an end cap 26.
As shown in fig. 1, 2, 11 and 12, the lower joint 5 has a double-layer structure, and comprises an inner joint B38 and an outer joint B40, wherein the inner joint B38 and the outer joint B40 are connected by virtue of the sand discharging cylinder 16 and the rib plate B61; the upper end of the inner joint B38 is provided with an internal thread C62 which is connected with the lower end of the inner tube 6 of the separator nipple 2, the upper end of the outer joint B40 is provided with an internal thread D63 which is connected with the lower end of the outer tube 7 of the separator nipple 2, the lower end of the inner joint B38 is provided with an external thread L64, the lower end of the outer joint B40 is provided with an external thread M65, and the lower end of the lower joint 5 is in threaded connection with other tools; a sand discharge channel 17 is arranged in the sand discharge cylinder 16, an internal thread E66 is arranged at an internal port 18 of the sand discharge channel 17 and is connected with a sand discharge pipe 19, and a discharge port 20 at the outer end is used for being connected with a sand conveying device for backfilling mud sand; the annulus of the lower joint 5 is a liquid inlet channel for exploiting the seabed natural gas hydrate, and the inner cavity of the lower joint 5 is a liquid return channel for mixing slurry.
The working principle of the invention is as follows: when the submarine natural gas hydrate is subjected to solid fluidization exploitation, high-pressure seawater is required to be introduced to jet flow to break the hydrate layer, and an annular channel formed by an annular space of the upper connector 1, an annular space of the separator nipple 2 and an annular space of the lower connector 5 is a liquid inlet channel of the high-pressure seawater; after jet breaking, collecting mixed slurry underground, the mixed slurry reaches a lower joint 5 of an underground separating device under the action of a lifting pump, the mixed slurry enters an inner cavity of an inner tube 6 in a separator nipple 2 from an inner cavity of the lower joint 5, then sequentially passes through a through hole C55 of a lower hanging head 15, a through hole B49 of a lower fixed disc 13 and a through hole A45 of an upper fixed disc 9, finally the mixed slurry enters a spiral tube 21 from a feed inlet 67, the mixed slurry flows into a port of a double-end spiral blade 57 in a vortex generator 3 which is tangentially opposite to the spiral tube 21 from the spiral tube 21, and is changed into spiral motion from linear motion under the guide action of the double-end spiral blade 57, so that energy loss caused by the mixed slurry entering the separator 4 and impacting a cylinder wall is reduced, short-circuit flow is reduced, and meanwhile, the double-end spiral blade 57 also enables the flow state of the mixed slurry to be more stable, and the pressure drop of the separating device is reduced; then the mixed slurry is subjected to cyclone separation in the separator 4, the separated silt moves downwards to be discharged to the sand discharge channel 17 through the sand discharge pipe 19, and then is discharged from the discharge port 20 for silt backfilling; the separated hydrate slurry moves upward from overflow tube 24 into the inner cavity of upper fitting 1 and then continues to be conveyed upward.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (5)
1. The utility model provides a take vortex generator's natural gas hydrate separator in pit which characterized in that: comprises an upper joint (1), a separator nipple (2), a vortex generator (3), a separator (4) and a lower joint (5); the upper end of the upper joint (1) is in threaded connection with other tools, and the lower end of the upper joint (1) is in threaded connection with the upper end of the separator nipple (2); the separator nipple (2) is divided into an inner pipe (6) and an outer pipe (7), an upper fixing disc (9), an upper fixing cylinder (10) and an upper hanging head (11) for axially positioning and righting a straight cylinder section (8) of the separator (4) are arranged at the upper part in the inner pipe (6), a lower fixing disc (13), a lower fixing cylinder (14) and a lower hanging head (15) for axially positioning and righting a conical cylinder section (12) of the separator (4) are arranged at the lower part in the inner pipe (6), the upper end of the separator nipple (2) is in threaded connection with the lower end of the upper joint (1), and the lower end of the separator nipple (2) is in threaded connection with the upper end of the lower joint (5); a sand discharging cylinder (16) is arranged in the lower joint (5), a sand discharging channel (17) is arranged in the sand discharging cylinder (16), an inner opening (18) of the sand discharging channel (17) is connected with a sand discharging pipe (19) in the separator (4), a discharge outlet (20) at the outer end is used for being connected with a sand conveying device for backfilling mud sand, the upper end of the lower joint (5) is in threaded connection with the lower end of the separator nipple (2), and the lower end of the lower joint (5) is in threaded connection with other tools; the vortex generator (3) is arranged in an inner pipe (6) of the separator nipple (2), an inlet of the vortex generator (3) is in spiral tangential connection with the spiral pipe (21), the upper end of the vortex generator (3) is in threaded connection with the upper hanging head (11), and the lower end of the vortex generator (3) is connected with the upper end of the separator (4) through a bolt A (22) and a nut A (23); the separator (4) is arranged in an inner pipe (6) of the separator pup joint (2), an overflow pipe (24) in the separator (4) is provided with an external thread A (25) which is connected with an end cover (26), and the lower end of a sand discharge pipe (19) in the separator (4) is provided with an external thread B (27) which is connected with an inner port (18) of the sand discharge channel (17);
the upper joint (1) is of a double-layer structure and comprises an inner joint A (28) and an outer joint A (29), wherein the inner joint A (28) and the outer joint A (29) are connected by virtue of a rib plate A (30), an external thread C (31) is arranged at the upper end of the inner joint A (28), an external thread D (32) is arranged at the upper end of the outer joint A (29), the upper end of the upper joint (1) is in threaded connection with other tools, an internal thread A (33) is arranged at the lower end of the inner joint A (28), an internal thread B (34) is arranged at the lower end of the outer joint A (29), and the lower end of the upper joint (1) is in threaded connection with the upper end of a separator nipple (2); the lower joint (5) is of a double-layer structure and comprises an inner joint B (38) and an outer joint B (40), wherein the inner joint B (38) and the outer joint B (40) are connected with a rib plate B (61) by means of a sand discharging cylinder (16), an inner thread C (62) is arranged at the upper end of the inner joint B (38) and is connected with the lower end of an inner pipe (6) of the separator nipple (2), an inner thread D (63) is arranged at the upper end of the outer joint B (40) and is connected with the lower end of an outer pipe (7) of the separator nipple (2), an outer thread L (64) is arranged at the lower end of the inner joint B (38), an outer thread M (65) is arranged at the lower end of the outer joint B (40), and the lower end of the lower joint (5) is in threaded connection with other tools; a sand discharging channel (17) is arranged in the sand discharging cylinder (16), an inner opening (18) of the sand discharging channel (17) is provided with an inner thread E (66) which is connected with a sand discharging pipe (19), and a discharge outlet (20) at the outer end is used for being connected with a sand conveying device for backfilling mud sand; the upper end of the inner pipe (6) is provided with an external thread E (35) which is connected with the lower end of an inner joint A (28) of the upper joint (1), the upper end of the outer pipe (7) is provided with an external thread F (36) which is connected with the lower end of an outer joint A (29) of the upper joint (1), the lower end of the inner pipe (6) is provided with an external thread G (37) which is connected with the upper end of an inner joint B (38) of the lower joint (5), and the lower end of the outer pipe (7) is provided with an external thread H (39) which is connected with the upper end of an outer joint B (40) of the lower joint (5); the annular space between the inner joint A (28), the inner pipe (6), the inner joint B (38) and the outer joint A (29), the annular space between the outer pipe (7) and the outer joint B (40) is a liquid inlet channel for exploiting the seabed natural gas hydrate, the inner cavities of the inner pipe (6) and the inner joint B (38) are liquid return channels for mixing slurry, and the inner cavity of the inner joint A (28) is a liquid return channel for hydrate slurry;
when the submarine natural gas hydrate is subjected to solid fluidization exploitation, high-pressure seawater is required to be introduced to jet crush a hydrate layer, after jet crushing, mixed slurry is collected underground, the mixed slurry reaches a lower joint (5) of an underground separation device under the action of a lifting pump, the mixed slurry enters the inner cavity of an inner tube (6) in a separator nipple (2) from the inner cavity of the lower joint (5), then sequentially passes through a through hole C (55) of a lower hanging head (15), a through hole B (49) of a lower fixed disc (13) and a through hole A (45) of an upper fixed disc (9), finally the mixed slurry enters a spiral tube (21) from a feed inlet (67), flows into a port of a double-head spiral blade (57) in a vortex generator (3) which is tangentially opposite to the spiral tube (21), the mixed slurry is changed into spiral motion from linear motion under the guide action of the double-head spiral blade (57), the energy loss generated by impact is reduced, short-circuit flow is reduced, and meanwhile, the mixed slurry flows into the double-head pressure drop of the separation device is further reduced; then the mixed slurry is subjected to cyclone separation in a separator (4), separated silt moves downwards and is discharged to a sand discharge channel (17) through a sand discharge pipe (19), and then is discharged from a discharge port (20) for silt backfilling; the separated hydrate slurry moves upwards to flow from the overflow pipe (24) into the inner cavity of the upper joint (1), and then is conveyed upwards continuously.
2. A downhole natural gas hydrate separation device with vortex generator according to claim 1, wherein: the inner tube (6) is of a double-head concave hole structure, an upper fixing disc (9) is embedded in a concave hole at the upper part of the inner tube (6), an upper fixing cylinder (10) for axially positioning the upper fixing disc (9) is arranged at the upper end of the upper fixing disc (9), and an upper hanging head (11) for limiting the axial movement of the upper fixing cylinder (10) is arranged at the upper end of the upper fixing cylinder (10); the lower fixing disc (13) is embedded in the concave hole at the lower part of the inner tube (6), the lower end of the lower fixing disc (13) is a lower fixing cylinder (14) for axially positioning the lower fixing disc (13), and the lower end of the lower fixing cylinder (14) is a lower hanging head (15) for limiting the axial movement of the lower fixing cylinder (14).
3. A downhole natural gas hydrate separation device with vortex generator according to claim 2, wherein: the center of the upper fixed disc (9) is provided with a fixed hole A (41) for sleeving and firmly fixing the straight barrel section (8) of the separator (4), the upper fixed disc (9) is provided with two connecting bases (42), a feed inlet (67) is arranged in each connecting base (42), four connecting holes (68) are formed in the periphery of each feed inlet (67), the pipe orifice of the spiral pipe (21) is opposite to the feed inlet (67), and the spiral pipe (21) is connected with the connecting bases (42) by adopting a bolt B (69) and a nut B (70); four spokes A (44) are arranged between a fixing hole A (41) and an outer ring A (43) in the upper fixing disc (9) and connected, and through holes A (45) between the spokes A (44) are liquid return channels for mixing slurry; the center of the lower fixed disc (13) is provided with a fixed hole B (46) for sleeving the conical section (12) of the separator (4), four spokes B (48) are arranged between the fixed hole B (46) and the outer ring B (47) in the lower fixed disc (13) for connection, and through holes B (49) between the spokes B (48) are liquid return channels for mixed slurry; the center of the upper hanging head (11) is provided with a threaded hole A (50), the threaded hole A (50) of the upper hanging head (11) is in threaded connection with the upper end of the end cover (26) of the vortex generator (3), and the upper hanging head (11) is provided with an external thread I (51) which is connected with an internal thread F (52) at the upper end of the inner pipe (6); the center of the lower hanging head (15) is provided with a threaded hole B (53), the threaded hole B (53) of the lower hanging head (15) is connected with an external thread J (54) on the upper part of a sand discharge pipe (19) in the separator (4), four through holes C (55) for mixing slurry liquid return are formed in the periphery of the threaded hole B (53), and the lower hanging head (15) is in threaded connection with the lower end of the inner pipe (6).
4. A downhole natural gas hydrate separation device with vortex generator according to claim 1, wherein: vortex generator (3) set up in inner tube (6) of separator nipple joint (2), including end cover (26), urceolus (56) and double-end helical blade (57), end cover (26) lower extreme and urceolus (56) upper end set up screw (58) and are connected, end cover (26) upper end sets up external screw thread K (59) and is connected with last string of first (11), end cover (26) center sets up one and is used for connecting internal thread hole (60) of overflow pipe (24) of separator (4), urceolus (56) lower extreme and straight section (8) upper end of separator (4) set up bolt A (22) nut A (23) and are connected, double-end helical blade (57) set up in the outside of overflow pipe (24), the upper portion port of each one end of double-end helical blade (57) is just to the tangential export of (21).
5. A downhole natural gas hydrate separation device with vortex generator according to claim 1, wherein: the separator (4) is arranged in an inner pipe (6) of the separator nipple (2), the separator (4) is arranged at the lower end of the vortex generator (3), an overflow pipe (24) in the separator (4) is provided with an external thread A (25) and is connected with an end cover (26), and the lower end of a sand discharge pipe (19) in the separator (4) is provided with an external thread B (27) and is connected with an inner opening (18) of the sand discharge channel (17).
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| CN109184658B (en) * | 2018-11-25 | 2021-01-22 | 西南石油大学 | Bias symmetrical parallel type seabed shallow natural gas hydrate in-situ separation device |
| CN110206527A (en) * | 2019-01-04 | 2019-09-06 | 西南石油大学 | A kind of high throughput hydrate underground separation shunting means using spiral separator |
| CN109882147A (en) * | 2019-03-16 | 2019-06-14 | 西南石油大学 | A kind of integral type hydrate situ downhole separation shunting means of high throughput |
| CN112502673B (en) * | 2021-02-01 | 2021-06-22 | 西南石油大学 | Natural gas hydrate normal position is gathered separation and is backfilled integration instrument |
| CN113090245B (en) * | 2021-04-19 | 2022-06-07 | 华东理工大学 | Underground rotational flow sorting and separating device and method for natural gas hydrate |
| CN114991741A (en) * | 2022-05-16 | 2022-09-02 | 东北石油大学 | Natural gas hydrate separation device and method |
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