CN116987537A - Three-phase separation device - Google Patents
Three-phase separation device Download PDFInfo
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- CN116987537A CN116987537A CN202311053750.0A CN202311053750A CN116987537A CN 116987537 A CN116987537 A CN 116987537A CN 202311053750 A CN202311053750 A CN 202311053750A CN 116987537 A CN116987537 A CN 116987537A
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- 238000005191 phase separation Methods 0.000 title claims abstract description 32
- 238000000926 separation method Methods 0.000 claims abstract description 146
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 139
- 239000007788 liquid Substances 0.000 claims abstract description 138
- 238000003860 storage Methods 0.000 claims abstract description 59
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000008258 liquid foam Substances 0.000 claims abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 94
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 14
- 239000003345 natural gas Substances 0.000 abstract description 7
- 239000003921 oil Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 93
- 239000010410 layer Substances 0.000 description 13
- 230000006872 improvement Effects 0.000 description 9
- 239000008346 aqueous phase Substances 0.000 description 6
- 230000001174 ascending effect Effects 0.000 description 5
- 238000009491 slugging Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005111 flow chemistry technique Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Degasification And Air Bubble Elimination (AREA)
Abstract
The invention provides a three-phase separation device, which relates to the technical field of petroleum and natural gas production and comprises a plurality of gas-liquid separation pipes, a plurality of liquid storage pipes and an oil-water separation collecting pipe; the uniform end of the gas-liquid separation pipe is connected with an inlet distribution collecting pipe, the other end is plugged, and the upper side of the gas-liquid separation pipe is connected with a gas phase outlet collecting pipe; a gas demister is arranged in the gas-liquid separation pipe; the upper side of the liquid storage pipe is connected with the lower side of a gas-liquid separation pipe, the other end of the liquid storage pipe is connected with an oil-water separation collecting pipe, the lower part of the oil-water separation collecting pipe is connected with a water phase outlet collecting pipe, and the upper part of the oil-water separation collecting pipe is connected with an oil phase outlet collecting pipe; an oil-water separation filler is arranged in the liquid storage pipe; the three-phase fluid is shunted to each gas-liquid separation pipe through an inlet distribution collecting pipe, the gas foam remover removes liquid foam in the gas, and the gas enters a gas phase outlet collecting pipe and is discharged; the liquid enters each liquid storage pipe to be subjected to oil-water separation through the oil-water separation filler, and the water and oil separation in the oil-water separation collecting pipe respectively enter the water phase outlet collecting pipe and the oil phase outlet collecting pipe. The invention solves the problem of plug flow of the gas field gathering and transportation pipe network section and simultaneously realizes the three-phase separation of oil, gas and water.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas production, in particular to a three-phase separation device.
Background
In natural gas production in gas fields, slugging can occur in a natural gas gathering and transportation pipeline network due to topography fluctuation, uneven flow of oil and gas in a pipeline, pipeline cleaning and the like. Slugging is caused by uneven distribution of liquid and gas in the pipeline. Gas field gathering pipelines deliver natural gas as well as condensate in multiphase flow, with liquids tending to settle at the bottom of the pipeline and gases occupying the top. Under certain conditions, liquid and gas may come together to form a slug; when slugging occurs inside the gathering and transportation pipeline, the slug volume of the slugging may exceed the gas/liquid handling capacity of the downstream oil and gas handling facility, in which case a slug catcher needs to be provided as a buffer facility in the downstream natural gas handling plant to eliminate the effect of the slugging on the oil and gas handling facility.
Most of the gas field gathering and transportation pipelines are used for three-phase mixed transportation of gas, oil and water. At present, the traditional slug flow catcher only has the function of primary gas-liquid separation, and separation equipment such as a three-phase separator is usually needed for oil-gas-water three-phase separation in a treatment plant; meanwhile, when the gas phase needs to be boosted by the compressor, a separator is arranged at the inlet of the compressor to remove liquid drops in the gas phase so as to meet the requirement of the compressor on air intake.
Therefore, the method has important significance on how to relieve the treatment pressure and equipment requirements of a downstream natural gas treatment plant and solve the problems of slug flow and three-phase separation at one time.
Disclosure of Invention
Aiming at the problems, the invention provides a three-phase separation device for simultaneously processing the slug flow of the gas field gathering and transportation pipe network and realizing the three-phase separation of oil, gas and water, and solves the problems that the existing slug flow processing device can only realize the primary separation of gas and liquid, and separation equipment such as a three-phase separator is added to perform the three-phase separation of oil, gas and water, so that the slug flow processing equipment is simplified, the processing efficiency is improved, and the investment is saved.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a three-phase separation device, comprising: the upper layer is provided with a plurality of gas-liquid separation pipes, and the lower layer is provided with a plurality of liquid storage pipes and an oil-water separation collecting pipe;
the uniform ends of the gas-liquid separation pipes are connected with an inlet distribution collecting pipe, three-phase fluid is input, the other ends of the gas-liquid separation pipes are plugged, the gas-phase separation pipes are connected with a gas-phase outlet collecting pipe at the upper side, and the gas-phase outlet collecting pipe is provided with a gas outlet; each gas-liquid separation pipe is internally provided with a gas demister;
the uniform end of each liquid storage pipe is plugged, the upper side of each liquid storage pipe is connected with the lower side of one gas-liquid separation pipe, the other ends of the liquid storage pipes are connected with oil-water separation collecting pipes, the lower parts of the oil-water separation collecting pipes are connected with a water phase outlet collecting pipe, and the upper parts of the oil-water separation collecting pipes are connected with an oil phase outlet collecting pipe; an oil-water separation filler is arranged in the liquid storage pipe and close to the oil-water separation collecting pipe;
three-phase fluid enters each gas-liquid separation pipe through the inlet distribution collecting pipe, liquid foam in the gas is removed by the gas foam remover, and the gas enters the gas-phase outlet collecting pipe and is discharged; the liquid enters each liquid storage pipe to carry out oil-water sedimentation separation, the oil-water separation is promoted by the oil-water separation filler, the liquid enters the oil-water separation collecting pipe, and water and oil are separated in the oil-water separation collecting pipe and respectively enter the water phase outlet collecting pipe and the oil phase outlet collecting pipe.
As a further improvement of the invention, the gas-liquid separation pipe is arranged from the three-phase fluid input end to the plugging end in an upward inclined way, and the gradient is 1:100.
As a further improvement of the invention, the gas demister is positioned at the front end of the connecting position of the gas phase outlet header.
As a further improvement of the invention, the liquid storage pipe sequentially comprises a liquid storage section, a connecting section and an oil-water separation section from a plugging end to the oil-water separation collecting pipe connecting end;
the liquid storage section is arranged by the downward inclination of the plugging end, and the gradient is 100:1.
As a further improvement of the invention, the connecting section is inclined downwards from one end connected with the liquid storage section to one end connected with the oil-water separation section, and the included angle between the connecting section and the horizontal direction is 10-30 degrees.
As a further improvement of the invention, the oil-water separation section is horizontally arranged and is provided with the oil-water separation filler;
the oil-water separation filler is fully distributed on the cross section of the oil-water separation section of the liquid storage pipe.
As a further improvement of the invention, the two ends of the lower side of the gas-liquid separation pipe are respectively provided with a main downcomer and an auxiliary downcomer which are connected with the liquid storage pipe;
the main downcomer is close to the plugging end of the liquid storage pipe, and the pipe diameter of the main downcomer is larger than that of the auxiliary downcomer.
As a further improvement of the invention, the pipe diameter of the main downcomer is 1.2-1.5 times of the pipe diameter of the auxiliary downcomer.
As a further improvement of the invention, the side surfaces of the gas phase outlet manifold, the oil phase outlet manifold and the water phase outlet manifold are respectively provided with a gas outlet, an oil phase outlet and a water phase outlet.
As a further development of the invention, a pressure equalization line is arranged between the gas outlet line and the oil phase outlet line.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, three-phase fluid in the gas field gathering and transportation pipeline is distributed to a plurality of gas-liquid separation pipes through the inlet distribution pipeline, so that the problem of slug flow is solved; further, by arranging the gas-liquid separation pipe, the liquid storage pipe and the oil-water separation collecting pipe, the oil-gas-water three-phase separation is realized, and compared with the condition that the existing slug flow catcher only has the primary separation of enterprises, the invention avoids the oil-gas-water three-phase separation operation of equipment such as a three-phase separator and the like in a downstream treatment plant, and saves the equipment; furthermore, by arranging the gas demister, the separated gas phase can reach the requirement of gas inlet and liquid content of the compressor, and can directly enter the compressor, compared with the prior art that a separator is arranged at the inlet of the compressor to remove liquid drops in the gas phase, the use quantity of separator equipment is reduced; the oil content in the water obtained by separation after oil-water sedimentation and oil-water separation filler treatment is as low as 100pm, and the water can directly enter treatment facilities such as downstream water CPI; meanwhile, the invention is arranged into an upper layer structure and a lower layer structure, and compared with the single layer structure of the existing equipment, the invention can effectively reduce the occupied area.
Drawings
FIG. 1 is a side view of a three-phase separation apparatus according to one embodiment of the present disclosure;
FIG. 2 is a top view of a three-phase separator device according to one embodiment of the present invention;
fig. 3 is a schematic diagram of a connection structure between an oil-water separation header and an oil-phase outlet header and a water-phase outlet header according to an embodiment of the present invention.
Reference numerals illustrate:
1. an inlet; 2. an inlet line; 3. an inlet distribution manifold; 4. a gas-liquid separation pipe; 5. a gas riser; 6. a gas phase outlet header; 7. a gas outlet; 8. a main downcomer; 9. a secondary downcomer; 10. a liquid storage tube; 11. an oil-water separation collecting pipe; 12. an oil phase communicating tube; 13. an oil phase outlet header; 14. an oil phase outlet; 15. an aqueous phase communicating pipe; 16. an aqueous phase outlet header; 17. an aqueous phase outlet; 18. a gas demister; 19. oil-water separation filler; 20. an inlet distribution header seal head; 21. a gas phase outlet header head; 22. oil-water separation header seal head; 23. water phase outlet header seal head; 24. pressure balance line.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1 and 2, the three-phase separation device provided by the present invention includes: the upper layer of the plurality of gas-liquid separation pipes 4, the lower layer of the plurality of liquid storage pipes 10 and the oil-water separation collecting pipe 11 are connected in a one-to-one correspondence manner, and the upper layer of the plurality of gas-liquid separation pipes 4 are connected with the lower layer of the plurality of liquid storage pipes 10; specifically, the number of the gas-liquid separation pipes 4 and the number of the oil storage tanks are four, so that the three-phase separation is facilitated by distributing 25% of three-phase liquid in the original gas field gathering and transportation pipe network in each gas-liquid separation pipe 4 and the oil storage tank while realizing slug flow treatment;
as shown in fig. 2, the uniform ends of the four gas-liquid separation pipes 4 are connected with an inlet distribution collecting pipe 3, the inlet distribution collecting pipe 3 inputs three-phase fluid into the four gas-liquid separation pipes 4, the other ends of the gas-liquid separation pipes 4 are plugged, and are connected to the same gas-phase outlet collecting pipe 6 at the upper side through a gas ascending pipe 5, and the side surface of the gas-phase outlet collecting pipe 6 is provided with a gas outlet 7; the front end of each gas-liquid separation pipe 4, which is close to the connection position of the gas ascending pipe 5, is provided with a gas demister 18, so that liquid foam in the gas to be discharged in the gas-liquid separation pipe 4 is removed, and the separated gas can meet the requirement of the air inlet of the compressor;
as shown in fig. 1, each liquid storage tube 10 is plugged at a uniform end and connected with the lower side of one gas-liquid separation tube 4 corresponding to the upper layer at the upper side of the end, preferably, both ends of the lower side of each gas-liquid separation tube 4 are respectively provided with a main downcomer 8 and an auxiliary downcomer 9 which are connected with the corresponding liquid storage tube 10; the main downcomer 8 is close to the plugging end of the liquid storage pipe 10, and the pipe diameter of the main downcomer 8 is larger than that of the auxiliary downcomer 9; the other end of each liquid storage pipe 10 is connected to an oil-water separation collecting pipe 11, as shown in fig. 3, the lower part of the oil-water separation collecting pipe 11 is connected with an aqueous phase outlet collecting pipe 16 through a plurality of aqueous phase communicating pipes 15, and the upper part of the oil-water separation collecting pipe 11 is connected with an oil phase outlet collecting pipe 13 through a plurality of oil phase communicating pipes 12, so that water at the lower part and oil at the upper part in the oil-water separation collecting pipe 11 are ensured to flow to the aqueous phase outlet collecting pipe 16 and the oil phase outlet collecting pipe 13; an oil-water separation filler 19 is arranged in the liquid storage pipe 10 and close to the oil-water separation collecting pipe 11 to promote the separation of oil and water in the liquid;
as shown in fig. 2, the front end of the inlet distribution manifold 3 is connected with a U-shaped inlet pipeline 2, an inlet 1 is arranged on the inlet pipeline 2, three-phase fluid enters the inlet pipeline 2 from the inlet 1 and flows into the inlet distribution manifold 3, enters each gas-liquid separation pipe 4 through the inlet distribution manifold 3, liquid foam in the gas is removed by a gas foam remover 18, the gas enters a gas phase outlet manifold 6 through a gas ascending pipe 5 and is discharged through a gas outlet 7, and gas-liquid separation is realized; the liquid enters the corresponding liquid storage pipes 10 through the main downcomer 8 and the auxiliary downcomer 9 respectively to carry out oil-water sedimentation separation, the oil-water separation is promoted through the oil-water separation filler 19, then the liquid in each liquid storage pipe 10 flows to the same oil-water separation collecting pipe 11, and water and oil in the oil-water separation collecting pipe 11 enter the water phase outlet collecting pipe 16 and the oil phase outlet collecting pipe 13 through the water phase communicating pipe 15 and the oil phase communicating pipe 12 respectively to realize water-oil separation.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
the gas-liquid separation tube 4 is arranged from the three-phase fluid input end to the plugging end in an upward inclined manner, the gradient is 1:100, the gas is promoted to flow to the plugging end (the right end in fig. 1, the end connected with the gas-phase outlet collecting pipe 6) of the gas-liquid separation tube 4, the gas-liquid separation is promoted, and the liquid phase is promoted to pass through the liquid storage section.
The gas demister 18 is located at the front end of the connecting position of the gas phase outlet header 6, as shown in fig. 1, the gas demister 18 is located at the downstream of the gas flow direction in the gas-liquid separation pipe 4, but is located at the front end of the mounting position of the gas ascending pipe 5, so that the gas can remove liquid foam before entering the gas ascending pipe 5, the entrainment of liquid foam of gas phase is effectively reduced, and the separated gas phase can meet the air inlet requirement of the compressor.
As shown in fig. 1, both ends of the lower side of each gas-liquid separation tube 4 are respectively provided with a main downcomer 8 and an auxiliary downcomer 9 which are connected with a liquid storage tube 10; the main downcomer 8 is close to the plugging end of the liquid storage pipe 10, and the pipe diameter of the main downcomer 8 is larger than that of the auxiliary downcomer 9; specifically, the pipe diameter of the main downcomer 8 is 1.2-1.5 times that of the auxiliary downcomer 9; because the gas-liquid separation tube 4 is obliquely arranged, as shown in fig. 1, the gas amount in the left half section of the gas-liquid separation tube 4 is smaller, the liquid content in the right half section is larger, and the liquid content in the right half section is smaller, so that the inner diameter of the main downcomer 8 close to the left end is larger, and the inner diameter of the auxiliary downcomer 9 at the right end is smaller according to the different liquid amounts, so that the liquid in a free state in the gas-oil-water three-phase fluid enters the liquid storage section from the main downcomer 8, and the liquid entrained in the gas phase enters the liquid storage section through the auxiliary downcomer 9 after being separated in the separation section well, thereby being more beneficial to the discharge of the liquid in the gas-liquid separation tube 4.
The liquid storage pipe 10 sequentially comprises a liquid storage section, a connecting section and an oil-water separation section from a plugging end to the connecting end of the oil-water separation collecting pipe 11; the liquid storage section is obliquely arranged downwards from the plugging end, the gradient is 100:1, so that the liquid slightly flows downwards, and water and oil slowly settle under the action of gravity in the flowing process, thereby being beneficial to water-oil separation; the connecting section is inclined downwards from one end connected with the liquid storage section to one end connected with the oil-water separation section, and the included angle between the connecting section and the horizontal direction is 10-30 degrees, so that the liquid rapidly flows downwards to accumulate energy, and the oil-water separation is promoted by the oil-water separation filler 19.
The oil-water separation section is horizontally arranged and is provided with an oil-water separation filler 19; the oil-water separation filler 19 is fully distributed on the cross section of the oil-water separation section of the liquid storage pipe 10.
The gas outlet 7, the oil phase outlet 14 and the water phase outlet 17 are respectively arranged on the side surfaces of the gas phase outlet manifold 6, the oil phase outlet manifold 13 and the water phase outlet manifold 16, gas flows out of the device from the gas outlet 7 through the gas phase outlet manifold 6, and the gas separated by the defoaming device can meet the air inlet requirement of the compressor; the oil content of the separated water phase is 1000ppm, and the water phase enters into a water phase outlet collecting pipe 16 and can be discharged to a water treatment system through a water phase outlet 17; the separated oil phase has a water content of 5%, and enters an oil phase outlet header 13 to be discharged to an oil treatment system through an oil phase outlet 14.
A pressure balance line 24 is arranged between the pipeline of the gas outlet 7 and the pipeline of the oil phase outlet 14, so that the device is prevented from being damaged due to overlarge pressure caused by overlarge outlet flow of the device.
Further, the method comprises the steps of,
the invention is provided with a detachable inlet distribution header 20, a gas phase outlet header 21, an oil-water separation header 22 and a water phase outlet header 23 respectively at an inlet distribution header 3, a gas phase outlet header 6, an oil-water separation header 11 and a water phase outlet header 16, so that the interior of the device can be cleaned conveniently when production is stopped or overhauled.
In particular, the method comprises the steps of,
the upper layer of the plurality of gas-liquid separation pipes 4, the lower layer of the plurality of liquid storage pipes 10 are all composed of four pipelines which are arranged in parallel, and are all finished steel pipes.
Examples:
as shown in fig. 1 and 2, a three-phase separation device in the present invention includes:
the gas-oil-water three-phase fluid from the gas field gathering and conveying pipeline enters an inlet distribution collecting pipe 3 through an inlet 1 and an inlet pipeline 2, and the gas-oil-water three-phase fluid is uniformly distributed into the cylinders of four gas-liquid separation pipes 4 through the inlet distribution collecting pipe 3 for gas-liquid separation;
the separated gas phase is discharged from the gas outlet 7 through the gas phase outlet collecting pipe 6 after the entrained liquid foam is removed through the gas foam removing device, and the gas separated through the foam removing device can meet the air inlet requirement of the compressor;
liquid in a free state in the gas-oil-water three-phase fluid enters a liquid storage pipe 10 from a main downcomer 8, and the liquid entrained by gas phase enters a liquid storage section through an auxiliary downcomer 9 after being separated in a separation section well.
The liquid phase entering the liquid storage section is subjected to oil-water sedimentation separation in an oil-water separation section, oil-water separation filler 19 in the oil-water separation section promotes oil-water separation, and the separated water phase has an oil content of 1000ppm, enters into a water phase outlet header 16 and can be discharged to a water treatment system through a water phase outlet 17;
the separated oil phase has a water content of 5%, enters an oil phase outlet header 13, and is discharged to an oil treatment system through an oil phase outlet 14.
The invention has the advantages that:
according to the invention, three-phase fluid in the gas field gathering and transportation pipeline is distributed to a plurality of gas-liquid separation pipes through the inlet distribution pipeline, so that the problem of slug flow is solved; further, by arranging the gas-liquid separation pipe, the liquid storage pipe and the oil-water separation collecting pipe, the oil-gas-water three-phase separation is realized, and compared with the condition that the existing slug flow catcher only has the primary separation of enterprises, the invention avoids the oil-gas-water three-phase separation operation of equipment such as a three-phase separator and the like in a downstream treatment plant, and saves the equipment; furthermore, by arranging the gas demister, the separated gas phase can reach the requirement of gas inlet and liquid content of the compressor, and can directly enter the compressor, compared with the prior art that a separator is arranged at the inlet of the compressor to remove liquid drops in the gas phase, the use quantity of separator equipment is reduced; the oil content in the water obtained by separation after oil-water sedimentation and oil-water separation filler treatment is as low as 100pm, and the water can directly enter treatment facilities such as downstream water CPI; meanwhile, the invention is arranged into an upper layer structure and a lower layer structure, and compared with the single layer structure of the existing equipment, the invention can effectively reduce the occupied area.
The invention can realize the three-phase separation of oil, gas and water while treating the slug flow, the separated gas phase can directly enter a compressor, the oil phase enters a downstream oil treatment facility, and the water phase enters a water treatment facility.
The invention is applied to a gas field station, can reduce the number of downstream three-phase separators and separation equipment at the inlet of a compressor, and can effectively reduce equipment investment.
The above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but various modifications and variations are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A three-phase separation device, comprising: the upper layer is provided with a plurality of gas-liquid separation pipes, and the lower layer is provided with a plurality of liquid storage pipes and an oil-water separation collecting pipe;
the uniform ends of the gas-liquid separation pipes are connected with an inlet distribution collecting pipe, three-phase fluid is input, the other ends of the gas-liquid separation pipes are plugged, the gas-phase separation pipes are connected with a gas-phase outlet collecting pipe at the upper side, and the gas-phase outlet collecting pipe is provided with a gas outlet; each gas-liquid separation pipe is internally provided with a gas demister;
the uniform end of each liquid storage pipe is plugged, the upper side of each liquid storage pipe is connected with the lower side of one gas-liquid separation pipe, the other ends of the liquid storage pipes are connected with oil-water separation collecting pipes, the lower parts of the oil-water separation collecting pipes are connected with a water phase outlet collecting pipe, and the upper parts of the oil-water separation collecting pipes are connected with an oil phase outlet collecting pipe; an oil-water separation filler is arranged in the liquid storage pipe and close to the oil-water separation collecting pipe;
three-phase fluid enters each gas-liquid separation pipe through the inlet distribution collecting pipe, liquid foam in the gas is removed by the gas foam remover, and the gas enters the gas-phase outlet collecting pipe and is discharged; the liquid enters each liquid storage pipe to carry out oil-water sedimentation separation, the oil-water separation is promoted by the oil-water separation filler, the liquid enters the oil-water separation collecting pipe, and water and oil are separated in the oil-water separation collecting pipe and respectively enter the water phase outlet collecting pipe and the oil phase outlet collecting pipe.
2. The three-phase separation device according to claim 1, wherein: the gas-liquid separation pipe is arranged in an upward inclined mode from the three-phase fluid input end to the plugging end, and the gradient is 1:100.
3. The three-phase separation device according to claim 1, wherein: the gas demister is positioned at the front end of the connecting position of the gas phase outlet collecting pipe.
4. The three-phase separation device according to claim 1, wherein: the liquid storage pipe sequentially comprises a liquid storage section, a connecting section and an oil-water separation section from a plugging end to the oil-water separation collecting pipe connecting end;
the liquid storage section is arranged by the downward inclination of the plugging end, and the gradient is 100:1.
5. The three-phase separation device according to claim 4, wherein: the connecting section is inclined downwards from one end connected with the liquid storage section to one end connected with the oil-water separation section, and the included angle between the connecting section and the horizontal direction is 10-30 degrees.
6. The three-phase separation device according to claim 4, wherein: the oil-water separation section is horizontally arranged and is provided with the oil-water separation filler;
the oil-water separation filler is fully distributed on the cross section of the oil-water separation section of the liquid storage pipe.
7. The three-phase separation device according to claim 1, wherein: the two ends of the lower side of the gas-liquid separation pipe are respectively provided with a main downcomer and an auxiliary downcomer which are connected with the liquid storage pipe;
the main downcomer is close to the plugging end of the liquid storage pipe, and the pipe diameter of the main downcomer is larger than that of the auxiliary downcomer.
8. The three-phase separation device according to claim 7, wherein: the pipe diameter of the main downcomer is 1.2-1.5 times of that of the auxiliary downcomer.
9. The three-phase separation device according to claim 1, wherein: the gas phase outlet manifold, the oil phase outlet manifold and the water phase outlet manifold are respectively provided with a gas outlet, an oil phase outlet and a water phase outlet on the side surfaces.
10. The three-phase separation device according to claim 1, wherein: and a pressure balance line is arranged between the gas outlet pipeline and the oil phase outlet pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311053750.0A CN116987537A (en) | 2023-08-21 | 2023-08-21 | Three-phase separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311053750.0A CN116987537A (en) | 2023-08-21 | 2023-08-21 | Three-phase separation device |
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| CN116987537A true CN116987537A (en) | 2023-11-03 |
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