CN108386180B - Caisson type gas-liquid two-phase underwater separator - Google Patents
Caisson type gas-liquid two-phase underwater separator Download PDFInfo
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- CN108386180B CN108386180B CN201810203331.3A CN201810203331A CN108386180B CN 108386180 B CN108386180 B CN 108386180B CN 201810203331 A CN201810203331 A CN 201810203331A CN 108386180 B CN108386180 B CN 108386180B
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- 239000007788 liquid Substances 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000012071 phase Substances 0.000 claims abstract description 29
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000007791 liquid phase Substances 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 9
- 238000005242 forging Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- 238000004210 cathodic protection Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005191 phase separation Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 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
- E21B43/36—Underwater separating arrangements
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
A caisson-type gas-liquid two-phase underwater separator, comprising: the system comprises an upper container body, a pipeline system, a connecting system connected with external facilities, a protection structure arranged on the upper container body, the pipeline system and the connecting system, and control equipment arranged on the protection structure; wherein, the upper container body is connected with the caisson; produced substances from each wellhead at the sea bottom are collected by a multiphase flow conveying pipeline and then enter the upper container body through a pipeline, and separated liquid phase is conveyed to an overwater treatment facility; the separated gas phase is conveyed to an overwater treatment facility; one path of the liquid outlet pipeline is conveyed to a water treatment facility, and the other path of the liquid outlet pipeline is converged into a multiphase inflow inlet pipeline again for secondary separation; an oil pipe hanger is installed in the upper container body, and the oil pipe is centered by adopting a slide way. The invention not only solves the problem that the external transportation can be carried out only by depending on the underwater manifold, but also greatly improves the engineering efficiency; moreover, when the electric submersible pump breaks down, the electric submersible pump can be independently recovered and maintained or replaced.
Description
Technical Field
The invention relates to a separator, in particular to a caisson type gas-liquid two-phase underwater separator for a deep water environment.
Background
With the rapid development of offshore oil and gas industrial technology and the demand of people on energy, the development of deepwater oil and gas fields becomes the key point of offshore oil development in the future. Wherein, the underwater separator is the key equipment of underwater production system, and its main function includes: gas-liquid two-phase separation or oil-gas-water three-phase separation. The underwater separation system is increasingly used in the development of the underwater production system, the use of the underwater separation system not only supports the flow guarantee of the underwater production system and improves the recovery ratio, but also reduces the upper supported facilities and equipment and the like, and provides powerful technical support for the underwater production system.
Currently, deepwater projects of underwater separation systems include both: oil, gas, water three-phase separation system also includes: a gas-liquid two-phase separation system; there are gravity type separators and vertical caisson type separators. The operated underwater caisson type separator and the underwater manifold are assembled into an integral device to redistribute gas and liquid and output. The structure is large and not compact enough, and the installation procedure is complex; and because the electric submersible pump can not be independently recovered, when the electric submersible pump breaks down, the whole underwater separator and the caisson must be lifted out of the water surface for maintenance or replacement, which brings certain difficulty to the maintenance or replacement of equipment.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art, and provides the caisson type gas-liquid two-phase underwater separator which is simple in structure, not only can output gas and liquid gas, but also solves the problem that the gas and liquid gas can be output only by depending on an underwater manifold, and greatly improves the engineering efficiency; moreover, when the electric submersible pump breaks down, the electric submersible pump can be independently recovered and maintained or replaced, so that the engineering cost is greatly saved; provides technical support for the engineering application of the strain in south China sea.
The purpose of the invention is realized by the following technical scheme:
a caisson-type gas-liquid two-phase underwater separator, comprising: the device comprises an upper container body for realizing gas-liquid cyclone separation, a pipeline system connected with the upper container body, a connecting system connected with external facilities, a protection structure arranged on the upper container body, the pipeline system and the connecting system, and control equipment arranged on the protection structure; wherein, the upper container body is connected with a caisson positioned at the lower part of the separator; produced materials from each wellhead at the sea bottom are collected through a multiphase flow conveying pipeline, then enter the upper container body through a pipeline, and separated liquid phase is conveyed to an above-water treatment facility through an electric submersible pump and a liquid outlet pipeline; the separated gas phase flows upwards by taking the pressure of the gas phase as power and is conveyed to the water treatment facility through a gas outlet pipeline; one path of the liquid outlet pipeline is conveyed to a water treatment facility, and the other path of the liquid outlet pipeline is converged into a multiphase inflow inlet pipeline again for secondary separation; and the upper container body is internally provided with a positioning oil pipe and an oil pipe hanger bearing the self gravity of the oil pipe, and the oil pipe adopts a slide rail type centering way to realize the independent recovery of the electric submersible pump.
The upper container body is a forging, including: a plurality of air outlet nozzles, liquid outlet nozzles and inlet nozzles; the top of the upper container body is provided with a chip-proof cap, and the lower surface of the upper container body is provided with a bottom connecting device; the lower part of the bottom connecting device is connected with the female connector and finally connected with the caisson; the side of the bottom connection device needs to be assembled with the wellhead connector and finally locked with the virtual wellhead connector under water.
The protection architecture is several layers of platelike structures, and the protection architecture includes: the device comprises an upper-layer separator protection structure and a lower-layer separator protection structure which is arranged on a lower layer at intervals, and is formed by welding upright columns arranged at four corners of the upper-layer separator protection structure and the lower-layer separator protection structure; wherein, the upper layer separator protection structure and the lower layer separator protection structure are respectively provided with a water permeable hole; and the upper separator protection structure is provided with a plurality of underwater valve operation and switch position indication holes and throttle valve operation holes; the upper-layer separator protection structure is also provided with an underwater robot operating handle and a plurality of lifting lugs respectively, and the protection structure is provided with a plurality of anode blocks to provide cathodic protection for the caisson type gas-liquid two-phase underwater separator; and the upright posts are respectively provided with a steel wire rope sleeve.
A plurality of first underwater valves are respectively arranged on two pipelines in the liquid outlet pipeline; and a second underwater valve and a throttle valve are arranged on the air outlet pipeline, and the pressure of the gas phase in the separator is controlled by adjusting the opening of the throttle valve.
The pipeline system is respectively provided with a liquid outlet pipeline underwater connector male head, a gas outlet pipeline underwater connector male head and an inlet pipeline underwater connector male head; when the underwater connector is installed on the sea, the male head of the underwater connector of the liquid outlet pipeline, the male head of the underwater connector of the gas outlet pipeline and the male head of the underwater connector of the inlet pipeline are respectively connected with the jumper pipes outside the sledge.
The control apparatus includes: the underwater control module transmits pressure data in the separator to the control room for controlling the technological parameters of the separator, receives the instruction of the control room at the same time, converts the instruction into a hydraulic signal and is used for operating an underwater valve; the underwater robot liquid flying line operation panel is provided with a multi-path quick connector and a temporary parking multi-path quick connector, and is used for connecting an umbilical cable during marine connection.
The caisson is of a cylindrical structure, a caisson lower end enclosure is arranged below the caisson, the caisson lower end enclosure is a flat cover end enclosure, and the caisson is located below a mud surface and is placed into a submerged virtual wellhead together after being connected with the upper container body on water; an electric submersible pump is fixed in the caisson, and the caisson conveys the separated liquid phase to the water treatment facility through a pipe string; and a pipeline centralizer is fixed on the outer wall of the pipe string of the caisson.
The bottom connecting device is a step type cylindrical forging; and the bottom connecting device is provided with a sealing ring fixing groove for positioning a sealing ring of the wellhead connector.
The tubing hanger comprises: an oil channel and several gas channels, the liquid phase lifted from the electric submersible pump enters the liquid outlet pipeline through the oil channel and the liquid outlet nozzle of the upper container body.
An internal pressure cap is arranged inside the upper container body and used for isolating the medium of the upper container body from the outside seawater, and a plurality of sealing rings are arranged in the internal pressure cap.
The invention has the beneficial effects that: by adopting the technical scheme, the invention has simple structure, not only can output gas and liquid gas, but also solves the problem that the gas and liquid gas can be output only by depending on an underwater manifold, thereby greatly improving the engineering efficiency; moreover, when the electric submersible pump breaks down, the electric submersible pump can be independently recovered and maintained or replaced, so that the engineering cost is greatly saved; provides technical support for the engineering application of the strain in south China sea.
Drawings
Fig. 1-1 is a schematic overall perspective view of the present invention.
Fig. 1-2 are schematic side views of the overall structure of the present invention.
Fig. 2-1 is a schematic perspective view of the piping arrangement of the present invention.
Fig. 2-2 is a schematic top view of the piping arrangement of the present invention.
Fig. 3-1 is a schematic perspective view of the upper container body of the separator of the present invention.
Fig. 3-2 is a schematic top view of the upper vessel body of the separator of the present invention.
Fig. 3-3 are schematic perspective views of the upper container body of the separator according to the present invention in another direction.
Fig. 3-4 is a schematic view of direction a in fig. 3-1.
Fig. 3-5 is a schematic view of fig. 3-1 from direction B.
Fig. 3-6 are schematic views of fig. 3-3 taken along direction C.
Fig. 4 is a cross-sectional view of a separator caisson of the invention.
The main reference numbers in the figures illustrate:
1-upper layer separator protection structure, 2-steel wire rope sleeve, 3-underwater control module, 4-operation panel of underwater robot electric flying line, 5-first underwater valve operation and switch position indication hole, 6-lower layer separator protection structure, 7-liquid outlet pipeline underwater connector male head, 8-flange, 9-throttle valve operation hole, 10-underwater robot operation handle, 11-second underwater valve operation and switch position indication hole, 12-anode block, 13-gas outlet pipeline underwater connector male head, 14-lifting lug, 15-protection structure, 16-water permeable hole, 17-third underwater valve operation and switch position indication hole, 18-upper container body, 19-chip-preventing cap, 20-inlet pipeline underwater connector male head, 21-pipeline system, 22-caisson, 23-electric submersible pump, 24-pipeline centralizer, 25-multi-way quick joint, 26-operation panel of underwater robot liquid flying line, 27-inlet spiral pipeline, 28-air outlet pipeline, 29-liquid outlet pipeline, 30-first underwater valve, 31-second underwater valve, 32-throttle valve, 33-third underwater valve, 34-inlet straight pipe section pipeline, 35-straight pipe section underwater valve, 36-pipeline support, 37-tee joint, 38-separator air outlet nozzle, 39-separator liquid outlet nozzle, 40-separator inlet nozzle, 41-bottom connecting device, 42-internal pressure cap, 43-first electric flying line channel, 44-oil pipe hanger, 45-air channel, 46-oil channel, 47-second electric flying line channel, 48-sealing ring fixing groove, 49-third electric flying line channel, 50-connector and 51-caisson lower end enclosure.
Detailed Description
The design principle of the invention is gas-liquid cyclone separation, produced substances from each wellhead at the seabed enter a caisson, liquid enters a liquid collecting area of the caisson and is sent to a water treatment facility through an electric submersible pump and an oil pipeline, and gas phase is under the self pressure: the working pressure in the caisson is power to flow upwards and is sent to the water treatment facility through the gas transmission pipeline.
As shown in fig. 1-1 to 4, the present invention includes: an upper container body 18 for providing a space for gas-liquid separation and realizing gas-liquid cyclone separation, a pipeline system 21 for realizing gas-liquid cyclone separation and connected with the upper container body 18, a connecting system connected with external facilities, a protection structure 15 arranged on the upper container body 18, the pipeline system 21 and the connecting system, and a control device arranged on the protection structure 15; wherein the upper containment body 18 is connected to a caisson 22 located at the lower part of the separator;
an internal pressure cap 42 is mounted on the upper container body 18, the internal pressure cap 42 is used for isolating the medium of the upper container body 18 from the external seawater, and a plurality of sealing rings are arranged in the internal pressure cap 42; the upper container body 18 is provided at the top with a dust cap 19 for ensuring the cleanness of the top of the pressure cap 42 inside the upper container body 18 and preventing adhesion of marine life.
The protection structure 15 is a multi-layer plate-shaped structure, and the protection structure 15 includes: the upper-layer separator protection structure 1 is arranged below the upper-layer separator protection structure 1 at a certain interval, and is formed by connecting upright posts arranged at four corners of the upper-layer separator protection structure 1 and the lower-layer separator protection structure 6 in a welding mode; wherein, the upper layer separator protection structure 1 and the lower layer separator protection structure 6 are respectively provided with a water permeable hole 16 so as to reduce the water inlet resistance of the whole structure; and the upper separator protection structure 1 is provided with a plurality of underwater valve operation and switch position indicating holes (in this embodiment, a first underwater valve operation and switch position indicating hole 5, a second underwater valve operation and switch position indicating hole 11, a third underwater valve operation and switch position indicating hole 17) and a throttle valve operation hole 9, so that an underwater robot can operate the underwater valve and the throttle valve conveniently; an underwater robot operating handle 10 is arranged on the upper separator protection structure 1 and the upright column to assist the underwater robot in operation; meanwhile, the four corners of the steel wire rope sleeve are respectively provided with a steel wire rope sleeve 2 for providing assistance for offshore installation and positioning; the top of the separator is also provided with a plurality of lifting lugs 14 (4 in the embodiment), and the protection structure 15 is also provided with an anode block 12 for providing cathodic protection for the caisson type gas-liquid two-phase underwater separator.
The pipeline system 21 is respectively provided with a male connector 7 of an underwater liquid outlet pipeline connector, a male connector 13 of an underwater gas outlet pipeline connector and a male connector 20 of an underwater inlet pipeline connector; when the underwater connector is installed on the sea, the male head 7 of the underwater connector of the liquid outlet pipeline, the male head 13 of the underwater connector of the gas outlet pipeline and the male head 20 of the underwater connector of the inlet pipeline are respectively connected with the jumper pipes outside the sledge; the underwater valves in the pipeline system 21 are all connected by welding, but the throttle valve is connected with the pipeline by a flange 8.
The control apparatus described above includes: the underwater control module 3, the underwater robot electric flying line operation panel 4 and the underwater robot liquid flying line operation panel 26 are arranged on the protection structure 15, wherein the underwater control module 3 transmits pressure data in the separator to a control room for controlling the technological parameters of the separator, and meanwhile, can receive the instruction of the control room, convert the instruction into a hydraulic signal and operate an underwater valve; the underwater robot liquid flying line operation panel 26 is provided with a multi-path quick connector 25 and a temporary parking multi-path quick connector, and is used for connecting an umbilical cable during marine connection.
An electric submersible pump 23 is fixed in the caisson 22, and the separated liquid phase is transported out of the caisson 22 to a water treatment facility through a pipe string; a pipe centralizer 24 is fixed to the outer wall of the string of caissons 22 to prevent damage to the caissons 22 from collision.
As shown in fig. 2-1 and fig. 2-2, the produced materials from each wellhead at the seabed are firstly collected through a multiphase flow conveying pipeline, then enter the upper container body 18 through an inlet straight pipe section pipeline 34 and an inlet spiral pipe pipeline 27, and the separated liquid phase is conveyed to an above-water treatment facility through an electric submersible pump 23 and a liquid outlet pipeline 29; the separated gas phase flows upwards under the power of the pressure of the gas phase and is conveyed to the aquatic treatment facility through a gas outlet pipeline 28. The liquid outlet pipeline 29 is divided into two paths through a tee joint 37, one path is conveyed to an above-water treatment facility through the liquid outlet pipeline underwater connector male head 7, the other path is converged into the multiphase flow inlet pipeline again for secondary separation, and a first underwater valve 30 and a second underwater valve 31 are respectively arranged in the two paths of pipelines. A third submerged valve 33 and a throttle valve 32 are provided in the outlet pipe 28, and the pressure of the gas phase in the separator is controlled by adjusting the opening of the throttle valve 32. The multiphase flow inlet pipeline is provided with a straight pipe section underwater valve 35, the inlet spiral pipe 27 is provided with a pipeline support 36 for bearing pipeline load, and the pipeline support 36 is installed on the upper container body 18 of the separator in a welding mode.
As shown in FIGS. 3-1, 3-2, and 3-3, upper vessel body 18 is a forging that includes: a plurality of nozzles (three nozzles of a separator air outlet nozzle 38, a separator liquid outlet nozzle 39 and a separator inlet nozzle 40 in the embodiment) and a bottom connecting device 41 which is respectively arranged on the anti-scrap cap 19 above the separator air outlet nozzle 38 and below the separator inlet nozzle 40, wherein the bottom connecting device 41 is used for connecting the caisson 22 and the dummy well head.
3-4, 3-5, and 3-6, the present invention employs skid-type centering of the tubing to achieve individual recovery of the electric submersible pump 23. The tubing hanger 44 is located in the upper containment body 18, the tubing hanger 44 is a forged piece with a complex cross section, and has the functions of positioning the tubing and bearing the gravity of the tubing, when the tubing hanger 44 is lowered to a certain position in the upper containment body 18, the tubing hanger 44 rotates along the guide rail side of the inner wall of the upper containment body 18, and finally, the tubing and the separator cylinder pipe are centered and positioned.
The tubing hanger 44 includes: an oil passage 46 and a plurality of gas passages 45, the liquid phase lifted from the electric submersible pump 23 enters the liquid outlet pipe 29 through the oil passage 46 and the separator liquid outlet nozzle 39. The number and diameter of the gas passages 45 need to be calculated and determined according to the process parameters. The invention uses an internal pressure cap 42 to isolate the medium of the upper container body 18 from the external seawater, 2-3 sealing rings can be arranged in the internal pressure cap 42, and a chip-proof cap 19 is arranged at the top of the separator to prevent the attachment of marine organisms. The first electric flying wire channel 43 reserves an electric joint for the gas-phase pressure sensor; the lower part of the separator is also provided with a plurality of sensors for measuring the liquid level and the oil-water decomposition level, and an electric joint of the sensors is reserved in a second electric flying wire channel 47; the cables and signal cables for supplying power to the electric submersible pump 23 pass through the third electric flying wire channel 49, an electric joint is reserved in the third electric flying wire channel 49, holes are formed in the oil pipe hanger 44 in advance, and the third electric flying wire channel 49 and the reserved hole in the oil pipe hanger 44 are centered while the oil pipe rotates.
The bottom connecting device 41 is a stepped cylindrical forging, the lower part of which is connected with the female head of the connector 50 in a welding mode and is finally connected with the caisson 22 through the connector 50; the side surface of the bottom connecting device 41 needs to be assembled with a wellhead connector, and is finally connected and locked with the virtual wellhead head underwater; the bottom connector 41 is provided with a seal ring retaining groove 48 for retaining a seal ring of the wellhead connector.
As shown in fig. 4, the lower caisson 22 of the separator of the present invention has a cylindrical structure, a lower caisson head 51 is disposed under the caisson 22, the lower caisson head 51 is a flat cover head, and the caisson 22 is located under the mud surface, and is connected with the upper container body 18 of the separator through a connector 50 on the water and then lowered into a virtual wellhead under the water.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (9)
1. A caisson type gas-liquid two-phase underwater separator is characterized in that: the method comprises the following steps: the device comprises an upper container body for realizing gas-liquid cyclone separation, a pipeline system connected with the upper container body, a connecting system connected with external facilities, a protection structure arranged on the upper container body, the pipeline system and the connecting system, and control equipment arranged on the protection structure; wherein, the upper container body is connected with a caisson positioned at the lower part of the separator; produced materials from each wellhead at the sea bottom are collected through a multiphase flow conveying pipeline, then enter the upper container body through a pipeline, and separated liquid phase is conveyed to an above-water treatment facility through an electric submersible pump and a liquid outlet pipeline; the separated gas phase flows upwards by taking the pressure of the gas phase as power and is conveyed to the water treatment facility through a gas outlet pipeline; one path of the liquid outlet pipeline is conveyed to a water treatment facility, and the other path of the liquid outlet pipeline is converged into a multiphase inflow inlet pipeline again for secondary separation; and the upper container body is internally provided with a positioning oil pipe and an oil pipe hanger bearing the self gravity of the oil pipe, and the oil pipe adopts a slide rail type centering way to realize the independent recovery of the electric submersible pump.
2. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: the upper container body is a forging, including: a plurality of air outlet nozzles, liquid outlet nozzles and inlet nozzles; the top of the upper container body is provided with a chip-proof cap, and the lower surface of the upper container body is provided with a bottom connecting device; the lower part of the bottom connecting device is connected with the female connector and finally connected with the caisson; the side of the bottom connection device needs to be assembled with the wellhead connector and finally locked with the virtual wellhead connector under water.
3. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: the protection architecture is several layers of platelike structures, and the protection architecture includes: the device comprises an upper-layer separator protection structure and a lower-layer separator protection structure which is arranged below the upper-layer separator protection structure at a certain interval and is formed by welding upright columns arranged at four corners of the upper-layer separator protection structure and the lower-layer separator protection structure; wherein, the upper layer separator protection structure and the lower layer separator protection structure are respectively provided with a water permeable hole; and the upper separator protection structure is provided with a plurality of underwater valve operation and switch position indication holes and throttle valve operation holes; the upper-layer separator protection structure is also provided with an underwater robot operating handle and a plurality of lifting lugs respectively, and the protection structure is provided with a plurality of anode blocks to provide cathodic protection for the caisson type gas-liquid two-phase underwater separator; and the upright posts are respectively provided with a steel wire rope sleeve.
4. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: a plurality of first underwater valves are respectively arranged on two pipelines in the liquid outlet pipeline; and a second underwater valve and a throttle valve are arranged on the air outlet pipeline, and the pressure of the gas phase in the separator is controlled by adjusting the opening of the throttle valve.
5. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: the pipeline system is respectively provided with a liquid outlet pipeline underwater connector male head, a gas outlet pipeline underwater connector male head and an inlet pipeline underwater connector male head; when the underwater connector is installed on the sea, the male head of the underwater connector of the liquid outlet pipeline, the male head of the underwater connector of the gas outlet pipeline and the male head of the underwater connector of the inlet pipeline are respectively connected with the jumper pipes outside the sledge.
6. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: the caisson is of a cylindrical structure, a caisson lower end enclosure is arranged below the caisson, the caisson lower end enclosure is a flat cover end enclosure, and the caisson is located below a mud surface and is placed into a submerged virtual wellhead together after being connected with the upper container body on water; an electric submersible pump is fixed in the caisson, and the caisson conveys the separated liquid phase to the water treatment facility through a pipe string; and a pipeline centralizer is fixed on the outer wall of the pipe string of the caisson.
7. The caisson-type gas-liquid two-phase underwater separator of claim 2, wherein: the bottom connecting device is a step type cylindrical forging; and the bottom connecting device is provided with a sealing ring fixing groove for positioning a sealing ring of the wellhead connector.
8. The caisson-type gas-liquid two-phase underwater separator of claim 1, wherein: the tubing hanger comprises: an oil channel and several gas channels, the liquid phase lifted from the electric submersible pump enters the liquid outlet pipeline through the oil channel and the liquid outlet nozzle of the upper container body.
9. The caisson-type gas-liquid two-phase underwater separator according to claim 1 or 2, wherein: an internal pressure cap is arranged inside the upper container body and used for isolating the medium of the upper container body from the outside seawater, and a plurality of sealing rings are arranged in the internal pressure cap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810203331.3A CN108386180B (en) | 2018-03-13 | 2018-03-13 | Caisson type gas-liquid two-phase underwater separator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810203331.3A CN108386180B (en) | 2018-03-13 | 2018-03-13 | Caisson type gas-liquid two-phase underwater separator |
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| CN108386180B true CN108386180B (en) | 2020-07-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080264645A1 (en) * | 2007-04-27 | 2008-10-30 | Chevron U.S.A. Inc. | Apparatus for mitigating slugging in flowline systems |
| CN103883305A (en) * | 2014-01-20 | 2014-06-25 | 中国石油大学(华东) | Deepwater seabed oil and water separation and reinjection device |
| CN104148196A (en) * | 2014-08-02 | 2014-11-19 | 中国石油大学(华东) | Inlet rectifying device of gas-liquid cylindrical cyclone |
-
2018
- 2018-03-13 CN CN201810203331.3A patent/CN108386180B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080264645A1 (en) * | 2007-04-27 | 2008-10-30 | Chevron U.S.A. Inc. | Apparatus for mitigating slugging in flowline systems |
| CN103883305A (en) * | 2014-01-20 | 2014-06-25 | 中国石油大学(华东) | Deepwater seabed oil and water separation and reinjection device |
| CN104148196A (en) * | 2014-08-02 | 2014-11-19 | 中国石油大学(华东) | Inlet rectifying device of gas-liquid cylindrical cyclone |
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