CN103835694B - Marine large-flow downhole oil-water separator with parallel type whirlcones - Google Patents
Marine large-flow downhole oil-water separator with parallel type whirlcones Download PDFInfo
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- CN103835694B CN103835694B CN201410118777.8A CN201410118777A CN103835694B CN 103835694 B CN103835694 B CN 103835694B CN 201410118777 A CN201410118777 A CN 201410118777A CN 103835694 B CN103835694 B CN 103835694B
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- cyclone
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Abstract
The invention relates to downhole oil-water separation same-well exploitation and injection equipment in the technical field of marine oilfield exploitation, in particular to a marine large-flow downhole oil-water separator with parallel type whirlcones. The marine large-flow downhole oil-water separator is suitable for exploitation of marine high-flow oil wells. The whole oil-water separator is divided to three layers which are arranged in parallel. The oil-water separator has the advantages that the small-flow whirlcones are arranged in parallel, so that separation efficiency of the separator is greatly promoted; downhole finite space is combined with structural features of a single whirlcone, a tail pipe end of a first-stage whirlcone and a cylindrical end of a second-stage whirlcone are on the same plane, the tail pipe end of the first-stage whirlcone and a tail pipe end of the second-stage whirlcone are on the same plane with a cylindrical end of a third-stage whirlcone, and accordingly the number of small-flow whirlcones is increased and processing capacity of the whole separator is improved; the whole separator is formed in a sleeved mode layer by layer, so that reliability is higher, the structure is stable, safety performance is high and space is saved.
Description
Technical field
The present invention relates to the downhole oil-water separation same well production-injection equipment in marine oil field production technique field, particularly to one kind
Cyclone parallel sea big flow downhole separation system.
Background technology
Exploit with offshore oilfield and enter high water-cut stage, add the strategy of " wide-spaced well high yield " that early stage is taken, lead to
In offshore oilfield production process, the contradiction between production cost and crude output is increasingly sharpened.In order to keep offshore oilfield daily
Oil production is constant, only increases Discharge rate, if these Produced Liquids all being given rise to offshore platform and is processed, afterwards again
Re-injection, considerably increases the burden of water processing establishment and lifting technology, and energy consumption also greatly increases, simultaneously because ocean platform space
Limited it is impossible to install more water processing establishments, therefore in the present circumstance, it is possible to increase device separative efficiency and disposal ability
The research and development of the novel technical method starting are extremely urgent.Correlative study both at home and abroad shows, by using oily-water seperating equipment in down-hole,
While increasing crude output, surface water rate can also be substantially reduced.
Although the application of downhole oil-water separation technology comparative maturity on land, traditional downhole oil-water separation
System is all the downhole hydraulic cyclone of configuration single-stage or plural serial stage form, and can meet separative efficiency to a certain extent will
Ask.But for the high oil well in land or offshore oilfield Liquid output, single-stage or plural serial stage hydrocyclone disposal ability are not enough
Problem start to manifest, on the one hand, for adapt to high disposal liquid measure it is necessary to configure big nominal diameter downhole hydraulic cyclone；Separately
On the one hand, the separative efficiency of hydrocyclone can decline with the increase of nominal diameter.Consider, single-stage or plural serial stage
Hydrocyclone group be not appropriate for the oil well of high Liquid output.
Domestic patent has occurred in that cyclone downhole oil-water separation device in parallel at present, but down-hole limited space,
The cylindrical end of this cyclone group in parallel all in one plane, leads to the quantity that down-hole is furnished with cyclone to be subject to very big
Limit, largely waste down-hole space, reduce separative efficiency and the disposal ability of system.Based on above-mentioned it is proposed that
A kind of cyclone parallel sea big flow downhole separation system, it is very big to take full advantage of the confined space of down-hole,
It is applied to the oil well of the marine big flow of exploitation（Process flow Q=1000m3/d）, create beneficial effect.
Content of the invention
The technical problem to be solved in the present invention is：The distribution of three level cyclone separator groups, the configuration of overflow lifting oil pipe,
Connected mode between each several part and the design of inner flow passage structure, the technical scheme of employing is as follows：
A kind of cyclone parallel sea big flow downhole separation system, by oil transportation oil pipe, electric pump unit, intersection
Flow path structure, intersection runner, bipyramid cyclone A, middle overflow lifting oil pipe, bipyramid cyclone B, underflow stream lifting oil pipe, double
Cone cyclone C, produce layer, water filling layer, overflow conflux disk, upper shunting disk, upper shell, upper middle connection housing, middle housing, lower
Support plate, lower house, positioning support plate, positioning support tube, upper support plate, middle overflow conflux disk, middle shunting disk, middle support plate, under
Overflow conflux disk, lower shunting disk, bipyramid cyclone D composition are it is characterised in that described electric pump unit is plugged in intersection runner connects
In the runner that head upper left side is opened, oil transportation oil pipe is plugged in the runner that intersection flow path structure upper right side is opened, outside the runner of intersection
Shell is threaded connection and is plugged in the runner that intersection flow path structure lower end is opened, and method is passed through with upper shell in intersection runner lower end
Blue connection, the housing of described package unit is followed successively by upper shell, upper middle connection housing, middle housing, lower house, mutually from top to bottom
Between be threaded connection, the internal separator of described package unit includes three layers：Ground floor separator assembly, second layer eddy flow
Device assembly, third layer cyclone assembly, are provided with production layer and water filling layer outside described package unit.
Above-mentioned upper shell, middle housing, lower house, these three housing cavity are provided with stair-stepping projection.
Above-mentioned ground floor separator assembly include bipyramid cyclone A, middle overflow lifting oil pipe, overflow conflux disk, on
Shunting disk, upper support plate, described ground floor cyclone group is made up of single bipyramid cyclone A, installs with upper shell coaxial line, institute
State upper casing intracoelomic cavity from top to bottom on be followed successively by overflow conflux disk, upper shunting disk, upper support plate, left side has looping pit
Shape runner b, runner e, runner f, three annular channel coaxial line alignment are installed, and described overflow conflux disk has the ring of bicircular arcs
Empty runner d, described bipyramid cyclone A cylindrical end is inserted in the hole opened in the middle of support plate, and described middle overflow lifting oil pipe leads to
Cross threaded be inserted in the hole that shunting disk left end is opened, lower end is threaded connection and is inserted into middle overflow conflux disk left end and opens
Hole in, in the hole opened through upper support plate left end of centre, described overflow conflux disk upper end cylinder runner and intersection runner
Lower end cylinder flow passage.
Above-mentioned second layer separator assembly includes bipyramid cyclone B, underflow stream lifting oil pipe, middle overflow conflux disk, in
Shunting disk, middle support plate, described second layer cyclone group is composed in parallel by four bipyramid cyclone B, described middle housing cavity from
It is followed successively by middle overflow conflux disk, middle shunting disk, middle support plate, cylindrical end is inserted in the hole that middle support plate is opened on top to bottm,
Described underflow stream lifting oil pipe upper end is threaded connection and is inserted in the hole that middle shunting disk left end is opened, and lower end is threaded connection
It is inserted in the hole that underflow stream conflux disk left end is opened, in the hole that centre is opened through middle support plate left end.
Above-mentioned third layer separator assembly includes bipyramid cyclone C, lower support plate, underflow stream conflux disk, lower shunting disk,
Bipyramid cyclone D, described third layer cyclone group is composed in parallel by four bipyramid cyclone C and four bipyramid cyclone D, cylinder
End is inserted in the hole that lower support plate is opened, described lower housing cavity from top to bottom on be followed successively by underflow stream conflux disk, described under
13 holes are all had above shunting disk and lower support plate.
Above-mentioned lower housing cavity lower end is provided with positioning support plate and positioning support tube, supports a whole set of interior arrangement, described
13 holes are had in positioning support plate.
Above-mentioned a whole set of cyclone group is by bipyramid cyclone A, bipyramid cyclone B, bipyramid cyclone C, bipyramid cyclone D simultaneously
Joint group becomes, and the entrance of three layers of cyclone is interconnected in same annular space pipeline, described the whole series bipyramid cyclone group tail pipe end
Face is on a plane.
The invention has the advantages that：In parallel using low discharge cyclone, it is greatly improved the separative efficiency of device；It
The design feature of the confined space of down-hole and single cyclone is combined, the tail pipe end of first order cyclone and second level eddy flow
, on a plane, the cylindrical end of the tail pipe of the first order and second level cyclone and the cyclone of the third level is at one for the cylindrical end of device
Plane, is arranged so as to, and increased the quantity of low discharge cyclone, increases the disposal ability of package unit；Package unit is layer by layer
It is nested together, reliability is higher, Stability Analysis of Structures, security performance high, save space.
Brief description
Fig. 1：The general structure schematic diagram of apparatus of the present invention；
Fig. 2：The general structure sectional view of apparatus of the present invention；
Fig. 3：A-A sectional view in Fig. 2；
Fig. 4：B-B sectional view in Fig. 2；
Fig. 5：C-C sectional view in Fig. 2；
Fig. 6：D-D sectional view in Fig. 2；
Fig. 7：E-E sectional view in Fig. 2；
Fig. 8：F-F sectional view in Fig. 2；
Fig. 9：G-G sectional view in Fig. 2；
Figure 10：H-H sectional view in Fig. 2；
Figure 11：I-I sectional view in Fig. 2；
Figure 12：J-J sectional view in Fig. 2；
Figure 13：K-K sectional view in Fig. 2；
Figure 14：L-L sectional view in Fig. 2；
Figure 15：M-M sectional view in Fig. 2；
Figure 16：N-N sectional view in Fig. 2；
Figure 17：O-O sectional view in Fig. 2.
Symbol description
1. oil transportation oil pipe, 2. electric pump unit, 3. intersection flow path structure, 4. intersection runner, 5. bipyramid cyclone
A, 6. in overflow lifting oil pipe, 7. bipyramid cyclone B, 8. underflow stream lifting oil pipe, 9. bipyramid cyclone C, 10. produce
Layer, 11. water filling layers, 12. overflow conflux disks, shunting disk on 13., 14. upper shells, middle connection housing on 15., 16.
Middle housing, 17. times support plates, 18. lower houses, 19. positioning support plates, 20. support tubes, support plate on 21., in 22.
Overflow conflux disk, shunting disk in 23., support plate in 24., 25. underflow stream conflux disks, 26. times shunting disks, 27. bipyramid rotations
Stream device D.
A-o is flow channel for liquids.
Specific embodiment
The invention will be further described with example below in conjunction with the accompanying drawings：
As shown in Fig. 1-17, a kind of cyclone parallel sea big flow downhole separation system, by oil transportation oil pipe 1,
Electric pump unit 2, intersection flow path structure 3, intersection runner 4, bipyramid cyclone A5, middle overflow lifting oil pipe 6, bipyramid cyclone
B7, underflow stream lifting oil pipe 8, bipyramid cyclone C9, produce layer 10, water filling layer 11, overflow conflux disk 12, upper shunting disk 13,
Upper shell 14, upper middle connection housing 15, middle housing 16, lower support plate 17, lower house 18, positioning support plate 19, positioning support tube
20th, upper support plate 21, middle overflow conflux disk 22, middle shunting disk 23, middle support plate 24, underflow stream conflux disk 25, lower shunting disk 26,
Bipyramid cyclone D27 forms it is characterised in that described electric pump unit 1 is plugged in the runner that intersection flow path structure 3 upper left side is opened
In, oil transportation oil pipe 1 is plugged in the runner that intersection flow path structure 3 upper right side is opened, and intersection runner 4 shell is threaded connection
It is plugged in the runner that intersection flow path structure 3 lower end is opened, intersection runner 4 lower end is connected by flange with upper shell 14, institute
The housing stating package unit is followed successively by upper shell 14, upper middle connection housing 15, middle housing 16, lower house 18, mutually from top to bottom
Between be threaded connection, the internal separator of described package unit includes three layers：Ground floor separator assembly, second layer eddy flow
Device assembly, third layer cyclone assembly, are provided with production layer 10 and water filling layer 11 outside described package unit.
Preferably upper shell 14, middle housing 16, lower house 18, these three housing cavity are provided with stair-stepping projection.
Preferably ground floor separator assembly includes bipyramid cyclone A5, middle overflow lifting oil pipe 6, overflow conflux disk
12nd, upper shunting disk 13, upper support plate 21, described ground floor cyclone group is made up of single bipyramid cyclone A5, with upper shell 14
Coaxial line install, described upper shell 14 inner chamber from top to bottom on be followed successively by overflow conflux disk 12, upper shunting disk 13, upper support plate
21, left side has annular poroid runner b, runner e, runner f, and three annular channel coaxial line alignment are installed, described overflow
Conflux disk 12 has the annular fiowpath d of bicircular arcs, and described bipyramid cyclone A5 cylindrical end is inserted into be opened in the middle of support plate 21
Hole in, described middle overflow lifting oil pipe 6 is threaded connection and is inserted in the hole that shunting disk 13 left end is opened, lower end pass through spiral shell
Line connects and is inserted in the hole that middle overflow conflux disk 22 left end is opened, in the hole opened through upper support plate 21 left end of centre, described on
Overflow conflux disk 12 upper end cylinder runner and intersection runner 4 lower end cylinder flow passage.
Preferably second layer separator assembly includes bipyramid cyclone B7, underflow stream lifting oil pipe 8, middle overflow conflux disk
22, middle shunting disk 23, middle support plate 24, described second layer cyclone group is composed in parallel by four bipyramid cyclone B7, described in
Housing 16 inner chamber from top to bottom on be followed successively by middle overflow conflux disk 22, middle shunting disk 23, middle support plate 24, during cylindrical end is inserted into
In the hole that support plate 24 is opened, described underflow stream lifting oil pipe 8 upper end is threaded connection and is inserted into middle shunting disk 23 left end and opens
Hole in, lower end is threaded connection and is inserted in the hole that underflow stream conflux disk 25 left end is opened, and middle passes through middle support plate 24 left
Hold in the hole opened.
Preferably third layer separator assembly includes bipyramid cyclone C9, lower support plate 17, underflow stream conflux disk 25, lower point
Flow table 26, bipyramid cyclone D27, described third layer cyclone group is by four bipyramid cyclone C9 and four bipyramid cyclone D27
Compose in parallel, cylindrical end is inserted in the hole that lower support plate 17 is opened, described lower house 18 inner chamber from top to bottom on be followed successively by down
Overflow conflux disk 25, described lower shunting disk 26 and lower support plate 17 all have 13 holes above.
Preferably lower house 18 inner chamber lower end is provided with positioning support plate 19 and positioning support tube 20, supports a whole set of internal dress
Put, described positioning support plate 19 has 13 holes.
Preferably a whole set of cyclone group is by bipyramid cyclone A5, bipyramid cyclone B7, bipyramid cyclone C9, bipyramid cyclone
D27 composes in parallel, and the entrance of three layers of cyclone is interconnected in same annular space pipeline, described the whole series bipyramid cyclone group tail
End surfaces are on a plane.
Workflow is that filled arrows are the flow direction of oil water mixture, and modest arrow is to separate fuel-displaced flowing side
Be from producing the oil water mixture of layer 10 after electric pump unit 2 supercharging to, process fluid flow, through runner a, runner b,
It is divided into two-way, the first via tangentially enters bipyramid cyclone A5 and forms spiral shell along the flowing of cylinder end wall surface eddy flow after runner e, runner d
Eddy flow, high-speed rotation flows downward entrance conical section, and after entering conical section, the diameter of section due to cyclone tapers into, and mixes
The speed closing liquid eddy flow is gradually accelerated, and the centrifugal force simultaneously producing similarly becomes big, and the less oil of density ratio is relatively low to pressure
Flow at axle center, and define, in axis centre, the interior whirlpool flowing up, flowed out in annular fiowpath c by overfall, pass through
The inner flow passage of intersection runner 4, is given rise to ground by oil transportation oil pipe 1, and the larger water of density flows down through tail pipe and is discharged to note
Water layer 11, the second tunnel, through runner f, middle housing 16 inner chamber, runner g, runner i, is also classified into two-way after entering annular fiowpath j, and one
After road tangentially enters four bipyramid cyclone B7 cylinder end wall surface at a high speed, after separating, the larger water of density flows down through tail pipe
It is discharged to water filling layer 11, the less oil of density sequentially passes through cyclone overfall, h runner, middle overflow lifting oil pipe 6, annular fiowpath c
It is lifted to ground with ground floor oil-water separation mixture, another road on the second tunnel is through runner k, runner l, runner after converging afterwards
After n, runner o, after the tangential cylinder end wall surface entering four bipyramid cyclone C9 and four bipyramid cyclone D27 separates at a high speed,
The larger water of density is injected into water filling layer 11 through tail pipe, and the less oil of density converges in runner m after each overfall is discharged,
After the oil that underflow stream lifting oil pipe 8 and the second layer are isolated converges, it is lifted to ground.
Claims (3)
1. a kind of cyclone parallel sea big flow downhole separation system, by oil transportation oil pipe (1), electric pump unit (2), hands over
Prong flow path structure (3), intersection runner (4), bipyramid cyclone A (5), middle overflow lifting oil pipe (6), bipyramid cyclone B
(7), underflow stream lifting oil pipe (8), bipyramid cyclone C (9), produce layer (10), water filling layer (11), overflow conflux disk (12),
Upper shunting disk (13), upper shell (14), upper middle connection housing (15), middle housing (16), lower support plate (17), lower house (18),
Positioning support plate (19), positioning support tube (20), upper support plate (21), middle overflow conflux disk (22), middle shunting disk (23), in
Support plate (24), underflow stream conflux disk (25), lower shunting disk (26), bipyramid cyclone D (27) composition are it is characterised in that described electric pump
Unit (2) is plugged in the runner that intersection flow path structure (3) upper left side is opened, and oil transportation oil pipe (1) is plugged in intersection runner and connects
In the runner that head (3) upper right side is opened, intersection runner (4) shell is threaded connection and is plugged under intersection flow path structure (3)
Hold in the runner opened, intersection runner (4) lower end is connected by flange with upper shell (14), and the housing of package unit is from top to bottom
It is followed successively by upper shell (14), upper middle connection housing (15), middle housing (16), lower house (18), be threaded connection from each other,
Separator within described package unit includes three layers：Ground floor separator assembly, second layer separator assembly, third layer are divided
It is provided with production layer (10) and water filling layer (11) outside device assembly, described package unit；
Ground floor separator assembly include ground floor cyclone group, middle overflow lifting oil pipe (6), overflow conflux disk (12), on
Shunting disk (13), upper support plate (21), ground floor cyclone group is made up of single bipyramid cyclone A (5), same with upper shell (14)
Axis is installed, described upper shell (14) inner chamber from top to bottom on be followed successively by overflow conflux disk (12), upper shunting disk (13), upper
Support plate (21), left side has annular poroid runner b, runner e, runner f, and three annular channel coaxial line alignment are installed, described
Overflow conflux disk (12) has the annular fiowpath d of bicircular arcs, and described bipyramid cyclone A (5) cylindrical end is inserted into support
In the hole opened in the middle of disk (21), described middle overflow lifting oil pipe (6) is threaded connection and is inserted into shunting disk (13) left end and opens
Hole in, lower end is threaded connection and is inserted in the hole that middle overflow conflux disk (22) left end is opened, middle passes through upper support plate
(21) in the hole that left end is opened, described overflow conflux disk (12) upper end cylinder runner and intersection runner (4) lower end cylinder runner
Connection；
Second layer separator assembly include second layer cyclone group, underflow stream lifting oil pipe (8), middle overflow conflux disk (22), in
Shunting disk (23), middle support plate (24), second layer cyclone group is composed in parallel by four bipyramids cyclone B (7), described middle housing
(16) inner chamber from top to bottom on be followed successively by middle overflow conflux disk (22), middle shunting disk (23), middle support plate (24), described bipyramid rotation
Stream device B (7) cylindrical end is inserted in the hole that middle support plate (24) is opened, and screw thread is passed through in described underflow stream lifting oil pipe (8) upper end
Connection is inserted in the hole that middle shunting disk (23) left end is opened, lower end is threaded connection and is inserted into underflow stream conflux disk (25) left end
In the hole opened, in the middle hole opened through middle support plate (24) left end；
Third layer separator assembly includes third layer cyclone group, lower support plate (17), underflow stream conflux disk (25), lower shunting disk
(26), bipyramid cyclone D (27), third layer cyclone group is by four bipyramids cyclone C (9) and four bipyramids cyclone D (27)
Compose in parallel, described bipyramid cyclone C (9) and bipyramid cyclone D (27) cylindrical end are inserted into the hole that lower support plate (17) is opened
In, described lower house (18) inner chamber from top to bottom on be followed successively by underflow stream conflux disk (25), lower shunting disk (26), lower support plate
(17), described lower shunting disk (26) and lower support plate (17) all have 13 holes above；
Bipyramid cyclone A (5), bipyramid cyclone B (7), bipyramid cyclone C (9), the entrance of bipyramid cyclone D (27) are same
It is interconnected in individual annular space pipeline, its tail pipe end face is on a plane.
2. cyclone according to claim 1 parallel marine with big flow downhole separation system it is characterised in that institute
State upper shell (14), middle housing (16), lower house (18), these three housing cavity are provided with stair-stepping projection.
3. cyclone according to claim 1 parallel marine with big flow downhole separation system it is characterised in that institute
State lower house (18) inner chamber lower end and be provided with positioning support plate (19) and positioning support tube (20), support the separation within package unit
Device, described positioning support plate (19) has 13 holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410118777.8A CN103835694B (en) | 2014-03-27 | 2014-03-27 | Marine large-flow downhole oil-water separator with parallel type whirlcones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410118777.8A CN103835694B (en) | 2014-03-27 | 2014-03-27 | Marine large-flow downhole oil-water separator with parallel type whirlcones |
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| CN103835694A CN103835694A (en) | 2014-06-04 |
| CN103835694B true CN103835694B (en) | 2017-02-15 |
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|---|---|---|---|
| CN201410118777.8A Expired - Fee Related CN103835694B (en) | 2014-03-27 | 2014-03-27 | Marine large-flow downhole oil-water separator with parallel type whirlcones |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107575206A (en) * | 2017-10-17 | 2018-01-12 | 西南石油大学 | A kind of modularization sea bed gas hydrate underground separator |
| CN107762479A (en) * | 2017-10-17 | 2018-03-06 | 西南石油大学 | A kind of tandem sea-bottom shallow gas hydrates in-situ separating device |
| CN108868737B (en) * | 2018-07-23 | 2020-06-02 | 中国石油大学(华东) | Underwater crude oil desanding device |
Citations (6)
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|---|---|---|---|---|
| US5456837A (en) * | 1994-04-13 | 1995-10-10 | Centre For Frontier Engineering Research Institute | Multiple cyclone apparatus for downhole cyclone oil/water separation |
| CN2405660Y (en) * | 1999-12-24 | 2000-11-15 | 胜利石油管理局工程机械总厂 | Hydraulic swirling-flow separator |
| CN202451120U (en) * | 2011-12-12 | 2012-09-26 | 北京东晟世纪科技有限公司 | High-flow underground oil-water separation and production-injection device for offshore oil production |
| CN103055549A (en) * | 2013-01-23 | 2013-04-24 | 中国石油大学(华东) | Bottom-drawing-in-type underground multistage oil-water separating device |
| CN103104240A (en) * | 2013-01-15 | 2013-05-15 | 中国石油大学(华东) | Downhole oil-water separation device with multistage hydrocyclones in parallel |
| CN203742579U (en) * | 2014-03-15 | 2014-07-30 | 中国石油大学(华东) | Marine high-flow underground oil-water separator adopting parallel-connection hydrocyclones |
-
2014
- 2014-03-27 CN CN201410118777.8A patent/CN103835694B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5456837A (en) * | 1994-04-13 | 1995-10-10 | Centre For Frontier Engineering Research Institute | Multiple cyclone apparatus for downhole cyclone oil/water separation |
| CN2405660Y (en) * | 1999-12-24 | 2000-11-15 | 胜利石油管理局工程机械总厂 | Hydraulic swirling-flow separator |
| CN202451120U (en) * | 2011-12-12 | 2012-09-26 | 北京东晟世纪科技有限公司 | High-flow underground oil-water separation and production-injection device for offshore oil production |
| CN103104240A (en) * | 2013-01-15 | 2013-05-15 | 中国石油大学(华东) | Downhole oil-water separation device with multistage hydrocyclones in parallel |
| CN103055549A (en) * | 2013-01-23 | 2013-04-24 | 中国石油大学(华东) | Bottom-drawing-in-type underground multistage oil-water separating device |
| CN203742579U (en) * | 2014-03-15 | 2014-07-30 | 中国石油大学(华东) | Marine high-flow underground oil-water separator adopting parallel-connection hydrocyclones |
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