CN115492566B - Multistage hydrate in-situ separation sand removal device realized by serial-parallel combination - Google Patents
Multistage hydrate in-situ separation sand removal device realized by serial-parallel combination Download PDFInfo
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- CN115492566B CN115492566B CN202211303232.5A CN202211303232A CN115492566B CN 115492566 B CN115492566 B CN 115492566B CN 202211303232 A CN202211303232 A CN 202211303232A CN 115492566 B CN115492566 B CN 115492566B
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- separator
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- 239000004576 sand Substances 0.000 title claims abstract description 76
- 238000000926 separation method Methods 0.000 title claims abstract description 48
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 14
- 210000001503 joint Anatomy 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims description 41
- 238000007599 discharging Methods 0.000 claims description 14
- 239000011268 mixed slurry Substances 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 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 description 4
- 239000011324 bead Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XURIQWBLYMJSLS-UHFFFAOYSA-N 1,4,7,10-tetrazacyclododecan-2-one Chemical compound O=C1CNCCNCCNCCN1 XURIQWBLYMJSLS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B43/38—Arrangements for separating materials produced by the well in the well
-
- 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
- E21B43/38—Arrangements for separating materials produced by the well in the well
- E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well
Abstract
The application discloses a multistage hydrate in-situ separation sand removal device realized by serial-parallel combination, which mainly solves the problems that a separation device cannot simultaneously meet the requirements of large treatment capacity, high treatment precision, incapability of backfilling sand in real time and the like in the prior art. The device comprises an outer pipe, top joints and bottom joints which are sleeved at two ends of the outer pipe, a sand discharge pipe which is sleeved at the periphery of the outer pipe, an inner pipe which is arranged inside the outer pipe and forms an annular pipeline with the outer pipe in a multi-section mode, a spiral separator which is arranged inside the inner pipe and is connected with the bottom joints, a first type middle joint with one end connected with the spiral separator, and a cyclone separation device with one end connected with the first type middle joint, the other end connected with the top joints and connected with the spiral separator in series. Through the scheme, the method achieves high-precision and large-treatment capacity, simultaneously meets the purpose of sand real-time backfilling, and has high practical value and popularization value.
Description
Technical Field
The application belongs to the technical field of petroleum drilling, and particularly relates to a multistage hydrate in-situ separation sand removal device realized by serial-parallel combination.
Background
The energy safety is the basis for guaranteeing the sustainable development of the country, and the consumption of energy is increased sharply along with the vigorous development of the economy of the country. The natural gas hydrate is also called as 'combustible ice', and is a high-density and high-calorific-value unconventional clean energy source (1 m) 3 The natural gas hydrate can release 164m 3 Methane gas and 0.8m 3 Water), has huge reserves, has considerable commercial development prospect, and can ensure the energy safety of China by efficiently developing natural gas hydrate, thereby realizing economic sustainable development. In recent years, the test mining results of China in the sea area of south China show that sand is continuously discharged in the test mining process, and the sand content in slurry is huge, so that the pipe transportation is difficultAnd the energy consumption of pipe transportation is high. Conventional sand control methods and apparatus have failed to meet long-term commercial exploitation of hydrates. In order to ensure sustainable commercial exploitation of marine hydrates, novel sand removal equipment is urgently needed.
For removal of sand particles (particle size mainly concentrated at 20-30 μm) of a Chinese hydrate reservoir, an in-situ separation technology based on a solid-state fluidization exploitation method has been proposed, and devices have been invented corresponding to the technology. For example, in-situ separation device for shallow natural gas hydrate on seabed with offset symmetry and parallel connection type is disclosed in China patent with application number 201811412136.8, the offset symmetry and large treatment capacity is disclosed in the patent, and in-situ separation and sand removal device for spiral hydrate with double-layer tube type series connection is disclosed in 202210423852.6, and spiral separators or cyclone separators are adopted in series connection or parallel connection mode in the patent, so that a single cyclone separator has the characteristics of high separation precision and large treatment capacity under the condition of the same tube diameter. The parallel multi-layer tubular cyclone separator can solve the problem of insufficient treatment capacity theoretically, but causes the sharp increase of the tube string length when the tube diameter is limited. The series spiral separation device solves the problem of insufficient separation precision, but simultaneously causes the sharp increase of the pipe string length. The device has the advantages that the device solves the problems of large treatment capacity or high separation precision, but cannot simultaneously meet the requirements of large treatment capacity and high treatment precision, and has no special sand discharging structure, so that separated sand cannot be discharged to the near-bit end for real-time backfill. Therefore, how to solve the problems existing in the prior art is a great need for solving the problems by those skilled in the art.
Disclosure of Invention
The application aims to provide a multistage hydrate in-situ separation sand removal device by serial-parallel combination, which mainly solves the problems that in the prior art, a separation device cannot simultaneously meet the treatment capacity, the treatment precision is high, sand cannot be backfilled in real time and the like.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the sand removing device comprises an outer tube, a top joint and a bottom joint, wherein the top joint and the bottom joint are sleeved at two ends of the outer tube and are provided with a jet flow channel and a recovery channel at the same time, a sand discharging tube which is sleeved at the periphery of the outer tube and forms a sand discharging channel with the outer tube, an inner tube which is arranged in the outer tube in a multi-section manner and forms an annular pipeline with the outer tube, a spiral separator which is arranged in the inner tube and is connected with the bottom joint, a first type middle joint with one end connected with the spiral separator, and a cyclone separating device with one end connected with the first type middle joint and the other end connected with the top joint and connected with the spiral separator in series; the cyclone separation device adopts a parallel input mode to carry out secondary separation on primary hydrate slurry separated from the spiral separator.
Further, the spiral separator comprises a spiral separation inlet at the front end, a spiral separation cavity at the middle part and communicated with the spiral separation inlet, and a separator recovery channel and a spiral sand discharge channel which are at the rear end and communicated with the spiral separation cavity, wherein the spiral sand discharge channel is communicated with the sand discharge channel and externally connected with a one-way valve to prevent backflow of separated hydrate slurry.
Further, the cyclone separation device comprises a plurality of cyclone separators which are mutually input in parallel and are positioned in the inner pipe, and a second-type middle joint used for connecting two adjacent cyclone separators, wherein the cyclone separators comprise overflow ports and bottom flow ports, and a plurality of separator inlets which are uniformly distributed at the tops of cylindrical sections of the cyclone separators, wherein the bottom flow ports of the first-stage cyclone separators are connected with the other ends of the first-type middle joints, and the overflow ports of the last-stage cyclone separators are connected with the top joints.
Further, the first type middle joint comprises a plurality of first type ribs which are arranged at the periphery of the first type middle joint at intervals and are sealed with the outer pipe, a first type sand discharge channel which is arranged at one end of the bottom of the first type middle joint and is used for being connected with a recovery channel of the separator and discharging hydrate mixed slurry after first purification into the first stage cyclone separator, a second series channel which is arranged inside the first type middle joint and is communicated with the first series channel and is in a Z-shaped structure, a first channel which is arranged at one end of the top of the first type middle joint and is used for being communicated with a bottom flow port of the first stage cyclone separator, a first type sand discharge channel which is arranged inside the first type middle joint and is communicated with the sand discharge channel at one end of the first type sand discharge channel, a middle sand discharge channel which is arranged at one end of the first type middle joint and is used for being communicated with the spiral sand discharge channel, and an inner pipe installation groove which is arranged at the bottom of the first type middle joint and is used for being installed with the inner pipe, wherein the second series channel is opened towards one end of the top joint, and the gap of the adjacent first type ribs and the outer pipe form a jet flow channel.
Further, the second type middle joint comprises a first overflow channel which is arranged at one end of the bottom of the second type middle joint and is used for being connected with an overflow port of the first stage cyclone separator, an overflow connecting channel which is arranged inside the second type middle joint and is communicated with the first overflow channel and is in a Z-shaped structure, a second channel which is arranged at one end of the top of the second type middle joint and is used for being connected with a bottom flow port of the final stage cyclone separator, a second sand discharging channel which is arranged inside the second type middle joint and is communicated with the sand discharging channel at one end and is communicated with the second channel at the other end of the bottom flow port, a mixed slurry channel which penetrates through the middle part of the second type middle joint and is used for discharging the hydrate mixed slurry after the first purification into the post cyclone separator, a plurality of second type protruding ribs which are arranged at the outer sides of the second type middle joint and are in threaded connection with the inner pipe, two middle mounting grooves which are arranged at intervals on the periphery of the second type middle joint and are in sealing with the outer pipe, and a middle limiting plate which is arranged in the middle mounting groove and two middle parts of the two cavities are separated into two independent areas; wherein the overflow connection channel opening is towards one end of the top joint; the overflow connecting channel and the mixed slurry channel are respectively positioned in two areas formed by the middle limiting plate, and the clearance between the adjacent second type protruding ribs and the outer tube form a jet flow channel.
Specifically, the top joint includes the hydrate slurry discharge channel that is used for connecting the overflow port of upper portion cyclone, set up in the top joint inside and one end with hydrate slurry discharge channel intercommunication, the other end opening is located cyclone one end and with overflow connection channel intercommunication's hydrate slurry channel, set up the top boss that is located cyclone one end and is used for installing the inner tube at the top joint, a plurality of intervals set up at the top joint periphery and realize sealed top bead with the outer tube, two top mounting grooves of seting up at the top joint periphery, and install in the top mounting groove and divide into two independent regional top limiting plates adjacent two joint cavities, wherein, adjacent top bead's clearance forms the efflux passageway with the outer tube.
Compared with the prior art, the application has the following beneficial effects:
(1) The application is provided with the serial-parallel combined separators, the hydrate mixed slurry collected is subjected to primary separation through the spiral separator, and the hydrate slurry after primary separation is subjected to secondary separation in the cyclone separation device, and the treatment capacity of the spiral separator is larger than that of the cyclone separator, so that the cyclone separation device adopts parallel input, and the large treatment can be satisfied. Meanwhile, the cyclone separator can separate and discharge the sand in the hydrate slurry which is separated out for the first time again, so that the hydrate with high precision is obtained.
(2) According to the application, the sand discharge pipe is arranged on the periphery of the outer pipe to form a sand discharge channel with the sand discharge pipe, sand separated from the separator is discharged into the sand discharge channel under the centrifugal action and moves downwards under the action of gravity, and the bottom of the sand discharge pipe is arranged on the bottom joint, so that the separated sand can backfill a reservoir treading cavity formed by hydrate in real time, and the stability of the reservoir is ensured.
Drawings
Fig. 1 is a schematic structural view of the present application.
Fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is a cross-sectional view of fig. 1 after rotation.
Fig. 4 is a schematic view of the structure of the top joint of the present application.
Fig. 5 is a top view of fig. 4.
Fig. 6 is a top view of a first type of center joint of the present application.
Fig. 7 is a cross-sectional view of a first type of center joint of the present application.
Fig. 8 is a top view of a second type of center joint of the present application.
Fig. 9 is a cross-sectional view at A-A in fig. 8.
Fig. 10 is a cross-sectional view at B-B in fig. 8.
In the above figures, the reference numerals correspond to the component names as follows:
the device comprises a 1-outer pipe, a 2-top joint, a 21-hydrate slurry discharge passage, a 22-hydrate slurry passage, a 23-top boss, a 24-top limit plate, a 25-top convex edge, a 26-top mounting groove, a 3-bottom joint, a 4-sand discharge pipe, a 5-inner pipe, a 6-spiral separator, a 61-spiral separation inlet, a 62-separator recovery passage, a 63-spiral sand discharge passage, a 7-first type middle joint, a 71-first type convex edge, a 72-first series passage, a 73-second series passage, a 74-first passage, a 75-first type sand discharge passage, a 76-middle sand discharge passage, a 77-middle inner pipe mounting groove, a 8-cyclone separator, an 81-overflow port, a 82-underflow port, a 83-separator inlet, a 9-second type middle joint, a 91-first overflow passage, a 92-overflow connection passage, a 93-underflow port second passage, a 94-second type sand discharge passage, a 95-mixed slurry passage, a 96-screw groove, a 97-second type, a 98-middle mounting groove, and a 99-middle limit plate.
Detailed Description
The application 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
As shown in fig. 1 to 10, a sand removing device for realizing multistage hydrate in-situ separation by serial-parallel combination comprises an outer tube 1, a top joint 2 and a bottom joint 3 which are sleeved at two ends of the outer tube 1 and are provided with a jet flow channel and a recovery channel at the same time, a sand discharging tube 4 which is sleeved at the periphery of the outer tube 1 and forms a sand discharging channel with the outer tube 1, an inner tube 5 which is arranged in the outer tube 1 in a multistage manner and forms an annular pipeline with the outer tube 1, a spiral separator 6 which is arranged in the inner tube 5 and is connected with the bottom joint 3, a first type middle joint 7 with one end connected with the spiral separator 6, and a cyclone separating device with one end connected with the first type middle joint 7 and the other end connected with the top joint 2 and connected with the spiral separator 6 in series; wherein, the cyclone separation device adopts a parallel input mode to carry out secondary separation on primary hydrate slurry separated from the spiral separator 6.
The installation step comprises the following steps: the installation principle is from inside to outside and from bottom to top. First, a spiral separator 6 is installed on a bottom joint 3, a separator recovery channel 62 is communicated with a hydrate mixed slurry recovery channel of the bottom joint 3, an inner pipe 5 positioned outside the spiral separator 6 is sleeved outside the spiral separator 6, and a first middle joint 7 is installed and the joint is subjected to waterproof treatment. Then, the first-stage cyclone separator is installed at the upper end of the first-stage middle joint 7, the bottom flow port 82 of the first-stage cyclone separator is connected with the first channel 74, one end of the middle limiting plate 99 is installed in the notch of the middle installation groove 98 for limiting and splitting, then, the inner pipe is sleeved outside the first-stage cyclone separator, if the cyclone separating device is only provided with two stages, the second-stage middle joint 9 for connecting the two stages of cyclone separators is installed according to the structure shown in fig. 9 and 10, if the two stages of cyclone separators are exceeded, a penetrating channel for discharging hydrate slurry separated by the previous stage cyclone separator to the hydrate slurry channel 22 needs to be penetrated from the second-stage joint at one side of the overflow connecting channel 92. The last cyclone separator is installed, the outer pipe 1 is installed outside the inner pipe, and all sand discharge channel ports are provided with one-way valves to prevent sand from flowing back. Then, the top joint 2 is installed at the upper part of the outer tube 1, the hydrate slurry discharge channel 21 of the top joint 2 is communicated with the separator recovery channel 62 of the last stage cyclone separator, finally, the sand discharge tube 4 is installed outside the outer tube 1, the bottom of the sand discharge tube 4 is installed on the bottom joint, and the sand discharge channel is arranged on the bottom joint. The primary hydrate slurry entering from the second serial channel 73 is divided into two areas by the middle limiting plate after entering the cyclone separating device, so that the installation position of the middle joint of the second class needs to be paid attention to during installation, and one area is ensured to be the primary hydrate slurry, and the other area is ensured to be the hydrate slurry after secondary separation. The channels are fastened by channel screws.
The working process comprises the following steps: the bottom joint 3 is externally connected with a nozzle, a drill bit, a pump and other needed downhole tools, the hydrate slurry discharge channel 21 of the top joint 2 is externally connected with a double-layer continuous pipe, and the double-layer continuous pipe is connected with a pump set outlet on a ship or a drilling platform and is powered by a pump set on a sea surface ship. Firstly, a pump is started, jet slurry is pumped in through annular space of an inner pipe and an outer pipe of a double-layer continuous pipe, and the jet slurry reaches underground tools such as a jet crushing nozzle, a guide drill bit and the like through a top jet channel, a jet channel and a bottom jet channel, so that crushing power is provided for the jet crushing nozzle, the jet crushing of a hydrate reservoir is achieved, and the hydrate reservoir is formed into hydrate mixed slurry.
The hydrate mixed slurry extracted from the reservoir enters the spiral separation cavity of the spiral separator 6 through the bottom joint 3, sand is discharged into the sand discharge channel by the sand channel spiral sand discharge channel 63 which is separated for the first time, the hydrate slurry which is separated for the first time enters the cyclone separation device from the separator recovery channel 62 through the first serial channel 72 and the second serial channel 73, the hydrate slurry which is separated for the first time enters the primary hydrate cavity formed by the inner pipe 5, the cyclone separator and the two limiting plates, when the hydrate slurry flows into the separator inlet 83 of the first-stage cyclone separator, a part of the hydrate slurry which is separated for the first time enters the first-stage cyclone separator, the other part of the hydrate slurry continuously enters the second-stage cyclone separator from bottom to top through the mixed slurry channel 95, when the hydrate slurry which is separated for the first time flows into the separator inlet of the second-stage cyclone separator, a part of the hydrate slurry enters the second-stage separator for separation, when the hydrate slurry which is separated for the first time enters the first-stage cyclone separator is not less than the third-stage cyclone separator, the hydrate slurry which is separated for the second time continues to flow into the cyclone separator after the second stage from top to the last stage. Sand separated from the cyclone separator is discharged into a sand discharge pipeline through a second type sand discharge channel 94, hydrate slurry separated from the first stage cyclone separator flows into a hydrate slurry cavity formed by the second stage cyclone separator, an inner pipe and two side limiting plates from a first overflow channel 91 and a second overflow channel, and when only two stages of cyclone separators exist, the separated hydrate is discharged into a collecting device on the sea surface through a hydrate slurry channel 22 and a hydrate slurry discharge channel 21 through a double-layer continuous pipe connected with the outside. If the cyclone separator is more than two stages, hydrate slurry separated from the first stage to the last second stage is upwards discharged through the through passage on the middle joint of the second type until the last stage of cyclone separator, and finally all the separated hydrate is discharged to a collecting device on the sea surface through a hydrate slurry passage 22 and a hydrate slurry discharge passage 21 and a double-layer continuous pipe connected with the outside.
The terms "inner", "outer", "upper", "lower" and "lower" are used herein to describe the specific installation location of the apparatus according to the present application (see fig. 2 and 3), wherein the hydrate recovery channels are the channels indicated by the arrows in fig. 3 and the channels indicated by the arrows in fig. 2, the jet channels (jet channels are used for sea water or drilling fluid transfer from the sea surface to the nozzles and drill bit, to power the jet broken hydrate reservoir, to lower the temperature of drilling by the drill bit and to carry cuttings) are the channels indicated by the arrows on both sides in fig. 3, and the sand discharge channels are the channels indicated by the arrows on both sides in fig. 3, to the bottom (outer periphery).
The above embodiments are only preferred embodiments of the present application, and not intended to limit the scope of the present application, but all changes made by adopting the design principle of the present application and performing non-creative work on the basis thereof shall fall within the scope of the present application.
Claims (5)
1. The multistage hydrate in-situ separation sand removal device is characterized by comprising an outer tube (1), a top joint (2) and a bottom joint (3) which are sleeved at two ends of the outer tube (1) and are provided with a jet flow channel and a recovery channel at the same time, a sand discharge tube (4) which is sleeved at the periphery of the outer tube (1) and forms a sand discharge channel with the outer tube (1), an inner tube (5) which is arranged in the outer tube (1) in a multistage manner and forms an annular pipeline with the outer tube (1), a spiral separator (6) which is arranged in the inner tube (5) and is connected with the bottom joint (3), a first type middle joint (7) with one end connected with the spiral separator (6), and a cyclone separation device with one end connected with the first type middle joint (7) and the other end connected with the top joint (2) and connected with the spiral separator (6) in series;
the spiral separator (6) comprises a spiral separation inlet (61) at the front end, a spiral separation cavity at the middle part and communicated with the spiral separation inlet (61), and a separator recovery channel (62) and a spiral sand discharge channel (63) at the rear end and communicated with the spiral separation cavity, wherein the spiral sand discharge channel (63) is communicated with the sand discharge channel and externally connected with a one-way valve to prevent backflow of separated hydrate slurry;
the first type middle joint (7) comprises a plurality of first type ribs (71) which are arranged at intervals on the periphery of the first type middle joint (7) and are used for sealing with the outer tube (1), a first series channel (72) which is arranged at one end of the bottom of the first type middle joint (7) and is used for being connected with a separator recovery channel (62) and discharging hydrate mixed slurry after first purification into a first stage cyclone separator, a second series channel (73) which is arranged inside the first type middle joint (7) and is communicated with the first series channel (72) and is in a Z-shaped structure, a bottom flow port first channel (74) which is arranged at one end of the top of the first type middle joint (7) and is used for being communicated with a bottom flow port (82) of the first stage cyclone separator, a first type sand discharge channel (75) which is arranged inside the first type middle joint (7) and is communicated with the sand discharge channel at one end and the other end of the bottom of the first type middle joint (7) and is used for being communicated with the middle sand discharge channel (76) of the spiral sand discharge channel (63);
the second type middle joint (9) comprises a first overflow channel (91) which is arranged at one end of the bottom of the second type middle joint (9) and is used for being connected with an overflow port (81) of the first stage cyclone separator, an overflow connecting channel (92) which is arranged inside the second type middle joint (9) and is communicated with the first overflow channel (91) and is in a Z-shaped structure, a bottom flow port second channel (93) which is arranged at one end of the top of the second type middle joint (9) and is used for being connected with a bottom flow port (82) of the last stage cyclone separator (8), a second type sand discharging channel (94) which is arranged inside the second type middle joint (9) and is communicated with the sand discharging channel at one end and the bottom flow port second channel (93), and a plurality of second type protruding ribs (97) which are arranged at the periphery of the second type middle joint (9) at intervals and are sealed with the outer tube (1);
the cyclone separation device adopts a parallel input mode to carry out secondary separation on primary hydrate slurry separated from the spiral separator (6), a jet flow channel is formed between the gaps of adjacent first-class ribs and the outer tube (1), and a jet flow channel is formed between the gaps of adjacent second-class ribs and the outer tube (1).
2. A serial-parallel combined in-situ separation and sand removal device for multistage hydrate according to claim 1, characterized in that the cyclone separation device comprises a plurality of cyclone separators (8) which are mutually input in parallel and are positioned in an inner pipe (5), and a second type middle joint (9) for connecting two adjacent cyclone separators, wherein the cyclone separators (8) comprise overflow ports (81) and bottom ports (82), and a plurality of separator inlets (83) which are uniformly distributed at the top of a cylindrical section of the cyclone separators (8), wherein the bottom ports (82) of the first stage cyclone separators are connected with the other end of the first type middle joint (7), and the overflow ports (81) of the last stage cyclone separators are connected with the top joint (2).
3. A serial-parallel combined in-situ separation and sand removal device for multistage hydrate according to claim 2, characterized in that the first type middle joint (7) further comprises a middle inner pipe installation groove (77) formed at the bottom of the first type middle joint (7) and used for installing the inner pipe (5), wherein the second serial channel (73) is opened towards one end of the top joint (2).
4. A multistage hydrate in-situ separation and sand removal device realized by serial-parallel combination according to claim 3, wherein the second-class middle joint (9) further comprises a mixed slurry channel (95) which is penetrated through the middle part of the second-class middle joint (9) and is used for discharging the hydrate mixed slurry after the first purification into a post cyclone separator, threaded grooves (96) which are formed at the outer sides of the two ends of the second-class middle joint and are used for being in threaded connection with the inner pipe (5), two middle mounting grooves (98) which are formed at the periphery of the second-class middle joint (9), and a middle limiting plate (99) which is arranged in the middle mounting grooves (98) and divides adjacent two joint cavities into two independent areas; wherein the overflow connection channel (92) is open towards one end of the top joint (2); the overflow connection channel (92) and the mixed slurry channel (95) are respectively positioned in two areas formed by the middle limiting plate (99).
5. The multistage hydrate in-situ separation sand removal device according to claim 4, wherein the top joint (2) comprises a hydrate slurry discharge channel (21) for connecting an overflow port (81) of the upper cyclone separator, a hydrate slurry channel (22) which is arranged inside the top joint (2) and one end of which is communicated with the hydrate slurry discharge channel (21) and the other end of which is open and is positioned at one end of the cyclone separator and is communicated with an overflow connecting channel (92), a top boss (23) which is arranged at one end of the top joint (2) and is used for installing an inner pipe (5), a plurality of top ribs (25) which are arranged at the periphery of the top joint (2) at intervals and are used for realizing sealing with the outer pipe (1), two top mounting grooves (26) which are arranged at the periphery of the top joint (2), and a top limiting plate (24) which is arranged in the top mounting grooves (26) and divides adjacent two joint cavities into two independent areas, wherein gaps of the adjacent top ribs and the outer pipe (1) form jet flow channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211303232.5A CN115492566B (en) | 2022-10-24 | 2022-10-24 | Multistage hydrate in-situ separation sand removal device realized by serial-parallel combination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211303232.5A CN115492566B (en) | 2022-10-24 | 2022-10-24 | Multistage hydrate in-situ separation sand removal device realized by serial-parallel combination |
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| Publication Number | Publication Date |
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| CN115492566A CN115492566A (en) | 2022-12-20 |
| CN115492566B true CN115492566B (en) | 2023-11-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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