CN110713226A - Oil-gas-water separation device - Google Patents
Oil-gas-water separation device Download PDFInfo
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- CN110713226A CN110713226A CN201810756459.2A CN201810756459A CN110713226A CN 110713226 A CN110713226 A CN 110713226A CN 201810756459 A CN201810756459 A CN 201810756459A CN 110713226 A CN110713226 A CN 110713226A
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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Abstract
The invention provides an oil-gas-water separation device, which comprises a primary separation component for performing primary separation of oil, gas and water on produced liquid, a secondary oil removal component for performing emulsion breaking and separation on primary separated oily sewage, a secondary water removal component for performing emulsion breaking and separation on primary separated oily crude oil, and an exhaust component for exhausting primary separated gas, wherein the primary separation component comprises a cyclone cavity and a cyclone separator arranged in the cyclone cavity, and the secondary oil removal component is positioned below the secondary water removal component and is communicated with the cyclone cavity; the exhaust assembly is communicated with the top end of the rotational flow cavity. The invention has the advantages of high oil-gas-water separation speed, high separation precision, small occupied space and the like.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to an oil-gas-water separation device.
Background
In the oil field development and production process, an oil-gas-water three-phase separation device is one of important production equipment. At present, most oil fields on land enter the middle and later development stages, and have the characteristic of double high with high water content and high extraction degree (particularly, the water content of old oil fields in the east of China is averagely as high as more than 90 percent). A large amount of oily sewage is generated in the process of oil development, which not only increases the exploitation cost, but also pollutes the environment. Particularly for offshore oil field development, the production area is limited by an offshore platform, and the conventional onshore sewage treatment device is not suitable for offshore oil field development because of the defects of huge equipment, high cost, large occupied area, low treatment speed and the like.
The principle adopted by the existing oil-gas-water separation device mainly comprises gravity, rotational flow, air flotation, static electricity and the like. The gravity separation is to separate oil, gas and water by utilizing the density difference of oil, gas and water phases and relying on the gravity differentiation effect, and the process has the advantages of simple structure, easy operation and strong reliability, but has the defects of low separation speed, small treatment liquid amount and large occupied area. The cyclone separation is a technology for separating phases with different densities in a heterogeneous mixture by using a centrifugal sedimentation principle, the process has a compact structure, low cost and flexible installation, but the applicable oil drop particle size range generally exceeds 20 mu m, and the defects of poor universality and the like caused by easy breaking of emulsified liquid drops (oil drops or water drops) are overcome. The air floatation method is a separation technology for enriching and separating surface active substances by taking air bubbles as a separation medium, has high process efficiency and small occupied area, but has the defects of high construction cost, poor impurity removal effect on high-density and large volume and the like. The electrostatic separation is a method for separating particles by generating electrostatic force with different sizes through an electric field according to different particle electric conductivities, is suitable for low-speed particles, and has the defects of low crude oil dehydration rate, high energy consumption and the like. Therefore, the problems of low separation speed, large occupied area, low separation precision and the like exist in the existing oil-gas-water separation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the oil-gas-water separation device which is high in oil-gas-water separation speed, high in separation precision and small in occupied space.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an oil-gas-water separation device comprises a primary separation component for carrying out primary separation of oil, gas and water on produced liquid, a secondary oil removal component for carrying out emulsion breaking and separation on primary separated oily sewage, a secondary water removal component for carrying out emulsion breaking and separation on primary separated oily crude oil, and an exhaust component for exhausting primary separated gas, wherein the primary separation component comprises a cyclone cavity and a cyclone separator arranged in the cyclone cavity, and the secondary oil removal component is positioned below the secondary water removal component and is communicated with the cyclone cavity; the exhaust assembly is communicated with the top end of the rotational flow cavity.
As a further improvement of the above technical solution:
the secondary oil removal assembly and the secondary water removal assembly both comprise a bionic super-wetting film component, the bionic super-wetting film component comprises a roller and super-wetting films with different separation characteristics, and each super-wetting film comprises a wetting film body covering the surface of the roller and a plurality of arc-shaped blades arranged along the circumferential direction of the wetting film body; the roller is provided with a through part for the liquid treated by the super-wetting film to flow into the roller and an inclined water outlet hole for the liquid in the roller to flow out and generate a rotational flow.
The bionic super-wetting membrane components of the secondary oil removal assembly are four groups, the super-wetting membranes of the four groups of bionic super-wetting membrane components are respectively an emulsion breaking membrane, a first hydrophilic oleophobic membrane, a heavy metal removal membrane and a desalting membrane which are sequentially arranged along the conveying direction of the oily sewage, and the mesh number of the super-wetting membranes is sequentially increased along the conveying direction of the oily sewage; the bionic super-infiltration membrane components of the secondary dewatering component are divided into two groups, the super-infiltration membranes of the two groups of bionic super-infiltration membrane components are respectively a demulsification membrane and a first oleophylic hydrophobic membrane which are sequentially arranged along the conveying direction of the water-containing crude oil, and the mesh number of the first oleophylic hydrophobic membrane is higher than that of the demulsification membrane.
The oil extraction assembly comprises an oil extraction pipeline and a second oleophylic hydrophobic membrane, the oil extraction pipeline is arranged on the secondary oil removal assembly and is positioned above a bionic super-wetting membrane part provided with a demulsification membrane and a first hydrophilic oleophobic membrane, and the second oleophylic hydrophobic membrane is arranged in the oil extraction pipeline; the drainage assembly comprises a drainage pipeline and a second hydrophilic oleophobic membrane, the drainage pipeline is arranged on the secondary dewatering assembly and is positioned below the two groups of bionic super-wetting membrane components, and the second hydrophilic oleophobic membrane is arranged in the drainage pipeline; the waste residue collector is arranged below each bionic super-infiltration membrane component.
The secondary oil removal assembly and the secondary water removal assembly further comprise a liquid inlet channel, a separation channel and a liquid outlet channel which are sequentially communicated, the diameter of the liquid inlet channel is smaller than that of the separation channel, and the liquid inlet channel is communicated with the separation channel through a conical cyclone section; the bionic super-infiltration membrane part is arranged in the separation channel.
The secondary oil removal assembly also comprises a water quality detection part for ensuring that the water quality reaches the emission standard, the water quality detection part comprises a water quality detector, a backflow pipeline, a three-way valve and a one-way valve, and the water quality detector is arranged on a liquid outlet channel of the secondary oil removal assembly; one end of the return pipeline is positioned at the downstream of the water quality detector, and the other end of the return pipeline is positioned at the upstream of the bionic super-infiltration membrane component; the three-way valve is arranged at the communication position of the backflow pipeline and the liquid outlet channel; the check valve is arranged in the return pipeline.
The device also comprises a controller, a liquid level detection piece for detecting the liquid level in the cyclone cavity, a gas regulating valve arranged on the exhaust assembly, a water outlet regulating valve arranged at the liquid inlet end of the secondary oil removal assembly, and an oil outlet regulating valve arranged at the liquid inlet end of the secondary water removal assembly; the input end of the controller is connected with the liquid level detection piece, and the output end of the controller is connected with the gas regulating valve, the water outlet regulating valve and the oil outlet regulating valve; and the controller controls the opening of the gas regulating valve, the water outlet regulating valve and the oil outlet regulating valve according to the liquid level detection value of the liquid level detection piece.
The liquid inlet ends of the secondary oil removal assembly and the secondary water removal assembly are respectively provided with a pressure sensor for detecting input pressure; the bottom end of the rotational flow cavity is communicated with a bypass pipe, and a bypass valve is arranged on the bypass pipe; the input end of the controller is connected with the pressure sensor, and the output end of the controller is connected with the bypass valve; when the pressure sensor detects that the pressure rises rapidly, the controller controls the bypass valve to be opened and controls the water outlet regulating valve and the oil outlet regulating valve to be closed.
The cyclone separator is a vane type swirler, vanes of the vane type swirler are spirally arranged, and the included angle between the tangential direction of a vane spiral line and a vane shaft is 15-75 degrees.
The bottom of the primary separation component is provided with a U-shaped input pipe for inputting the produced fluid to the cyclone cavity, an impurity removal component for removing solid-phase impurities of the produced fluid and a demulsification pore plate for performing primary oil-water separation on the produced fluid, wherein the U-shaped input pipe is communicated with the bottom of the primary separation component; the impurity removing assembly comprises a carbon dioxide feeding port, a waste residue collecting piece and a filter screen which are sequentially arranged along the liquid inlet direction to the liquid outlet direction of the U-shaped input pipe; the demulsification pore plate is arranged between the output end of the U-shaped input pipe and the rotational flow cavity.
Compared with the prior art, the invention has the advantages that:
the oil-gas-water separation device comprises a primary separation assembly, a secondary oil removal assembly, a secondary water removal assembly and an exhaust assembly, wherein the primary separation assembly comprises a cyclone cavity and a cyclone separator, the cyclone separator is arranged in the cyclone cavity and performs primary oil-gas-water separation on produced liquid under the cyclone action, then the secondary oil removal assembly is adopted to perform emulsion breaking and separation on primary separated oily sewage, the secondary water removal assembly is adopted to perform emulsion breaking and separation on primary separated aqueous crude oil, and the exhaust assembly is adopted to discharge primary separated gas, so that secondary fine separation of an oil-water mixture is realized, the oil-gas-water separation speed is high, and the separation precision is high. Meanwhile, according to the density difference of oil, gas and water, the secondary oil removal assembly is arranged below the secondary water removal assembly, and the exhaust assembly is arranged at the top end of the rotational flow cavity, so that the filtering effect of the oil, gas and water is ensured, the layout structure is simple and compact, and the occupied space is small.
The secondary oil removal assembly and the secondary water removal assembly further comprise a bionic super-wetting membrane component, the bionic super-wetting membrane component comprises a roller and super-wetting membranes with different separation characteristics, and the super-wetting membranes have the characteristics of demulsification, hydrophilic oleophobic property, oleophilic hydrophobic property and the like, so that secondary fine separation of an oil-water mixture is further realized. The super-infiltration membrane comprises an infiltration membrane body and a plurality of arc-shaped blades, the infiltration membrane body covers the surface of the roller, the arc-shaped blades are arranged along the circumferential direction of the infiltration membrane body, the contact area of the super-infiltration membrane and incoming liquid is greatly increased due to the arrangement of the arc-shaped blades, the filtering effect is further improved, the roller is driven to rotate after the incoming liquid is contacted with the super-infiltration membrane, the incoming liquid forms lateral washing on solid-phase particle impurities retained on the super-infiltration membrane, the smoothness of the super-infiltration membrane 52 is ensured, the service life of the super-infiltration membrane 52 is prolonged, the back washing process of the solid-phase particles is avoided, and the super-infiltration membrane is simple to operate and high in efficiency. Meanwhile, the through part and the inclined water outlet holes are formed in the roller, liquid treated by the super-wetting film flows into the roller through the through part, the liquid in the roller flows out through the inclined water outlet holes, a rotational flow is generated, the roller and the super-wetting film rotate, and the subsequent separation effect of oily sewage and crude oil containing water is ensured.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic view of the structure of an oil-gas-water separation apparatus of the present invention.
FIG. 2 is a schematic perspective view of a biomimetic super-wetting membrane part according to the present invention.
FIG. 3 is another schematic perspective view of a biomimetic super-wetting membrane part according to the present invention.
Fig. 4 is a perspective view of the drum according to the present invention.
The reference numerals in the figures denote:
1. a primary separation assembly; 11. a rotational flow cavity; 12. a cyclone separator; 13. a liquid level detection member; 14. a bypass pipe; 15. a bypass valve; 16. a U-shaped input tube; 17. an impurity removal assembly; 171. a carbon dioxide feed port; 172. a waste residue collection member; 173. a filter screen; 18. demulsifying the orifice plate; 2. a secondary oil removal assembly; 21. a water quality detection part; 211. a water quality detector; 212. a return line; 213. a three-way valve; 214. a one-way valve; 22. a water outlet regulating valve; 3. a secondary dewatering assembly; 31. an oil outlet regulating valve; 4. an exhaust assembly; 41. a gas regulating valve; 42. a top exhaust pipe; 43. a gas pressure detecting member; 5. a biomimetic super-infiltrated membrane component; 51. a drum; 511. a through part; 512. inclining the water outlet hole; 52. super-wetting the film; 521. infiltrating the membrane body; 522. an arc-shaped blade; 523. breaking the mammary membrane; 524. a first hydrophilic oleophobic membrane; 525. removing the heavy metal film; 526. a desalting membrane; 527. a first lipophilic hydrophobic membrane; 53. a bearing; 6. an oil discharge assembly; 61. an oil discharge pipe; 62. a second lipophilic hydrophobic membrane; 7. a drainage assembly; 71. a water discharge pipeline; 72. a second hydrophilic oleophobic membrane; 8. a waste residue collector; 9. an oil-water filtering channel; 91. a liquid inlet channel; 92. a separation channel; 93. a liquid outlet channel; 94. a conical swirling flow section; 10. a liquid pressure detecting member; 101. a first pressure sensor; 102. a second pressure sensor.
Detailed Description
The invention will be described in further detail with reference to the drawings and specific examples, without thereby limiting the scope of the invention.
Fig. 1 shows an embodiment of the oil-gas-water separation device of the present invention, which is suitable for use in onshore oil fields and offshore oil fields. The oil-gas-water separation device comprises a primary separation component 1, a secondary oil removal component 2, a secondary water removal component 3 and an exhaust component 4. The primary separation assembly 1 comprises a cyclone cavity 11 and a cyclone separator 12, wherein the cyclone separator 12 is arranged in the cyclone cavity 11 and is used for carrying out primary separation of oil, gas and water on produced liquid through cyclone action; the secondary oil removing assembly 2 is used for performing emulsion breaking and separation on the primarily separated oily sewage, the secondary dewatering assembly 3 performs emulsion breaking and separation on the primarily separated water-containing crude oil, the secondary oil removing assembly 2 and the secondary dewatering assembly 3 are both communicated with the cyclone cavity 11, and the secondary oil removing assembly 2 is positioned below the secondary dewatering assembly 3; the exhaust assembly 4 communicates with the top end of the cyclone chamber 11 to exhaust the primarily separated gas.
The oil-gas-water separation device disclosed by the invention adopts the rotational flow generated by the rotational flow separator 12 to carry out primary separation of oil, gas and water on produced liquid, then adopts the secondary oil removal assembly 2 to carry out emulsion breaking and separation on primarily separated oily sewage, adopts the secondary water removal assembly 3 to carry out emulsion breaking and separation on primarily separated aqueous crude oil, and adopts the exhaust assembly 4 to discharge primarily separated gas, so that secondary fine separation of an oil-water mixture is realized, the oil-gas-water separation speed is high, and the separation precision is high. Meanwhile, according to the density difference of oil, gas and water, the secondary oil removal assembly 2 is arranged below the secondary water removal assembly 3, and the exhaust assembly 4 is arranged at the top end of the rotational flow cavity 11, so that the filtering effect of oil, gas and water is ensured, the layout structure is simple and compact, and the occupied space is small.
As shown in fig. 2 to 4, the secondary oil removing assembly 2 and the secondary water removing assembly 3 of the present embodiment both include a bionic super-wetting film component 5, and the bionic super-wetting film component 5 includes a roller 51 and a super-wetting film 52. The super-wetting membrane 52 has different separation characteristics, such as demulsification, hydrophilic oleophobic property, oleophilic hydrophobic property and the like, namely, the super-wetting membrane 52 has the characteristics of demulsification, oleophilic hydrophobic property, hydrophilic oleophobic property and the like to realize secondary fine separation of the oily sewage and the water-containing crude oil, and the separation precision and reliability are high. The super-wetting film 52 used in the invention is a multi-stage microporous structure film material prepared by understanding the structure-activity relationship between the micro fine structure and the super-wetting characteristic of the biological interface and aiming at the requirements of oil-water complex components and the use environment, and meanwhile, the action relationship and behavior of the oil-water/material interface are improved by means of chemical modification, nano in-situ compounding and the like, and the thermal stability and the chemical stability (acid-base resistance and corrosion resistance) of the super-wetting film 52 are improved. The super-wetting membrane 52 is formed by constructing a bionic micro-nano multi-level structure, accurately regulating and controlling the surface free energy and multi-scale structure of the membrane, and coupling super-wetting materials with different super-wetting characteristics and different structural characteristics to realize the functions of demulsification, super hydrophobicity, super lipophobicity, heavy metal ion adsorption and the like.
In this embodiment, the super-wetting film 52 includes a wetting film body 521 and a plurality of arc-shaped blades 522. Wherein, the wetting film body 521 covers the surface of the roller 51; the arc-shaped blades 522 are arranged along the circumferential direction of the infiltration membrane body 521, the contact area of the super-infiltration membrane 52 and incoming liquid is greatly increased due to the arrangement of the arc-shaped blades 522, and the filtering effect is further improved. Meanwhile, the incoming liquid drives the roller 51 to rotate after contacting with the super-infiltration membrane 52, so that the incoming liquid forms lateral washing on solid-phase particle impurities remained on the super-infiltration membrane 52, the smoothness of the super-infiltration membrane 52 is ensured, the service life of the super-infiltration membrane 52 is prolonged, the back washing process of the solid-phase particles is avoided, and the operation is simple and the efficiency is high. In this embodiment, the degree of curvature of the arcuate vane 522 is set according to the incoming liquid velocity and the incoming liquid amount.
Meanwhile, the drum 51 is provided with a penetration portion 511 and an inclined water outlet hole 512, the drum 51 is installed in the oil-water filtering passage 9 through a bearing 53, and the drum 51 can rotate under the swirling action. The penetrating portion 511 is used for allowing the liquid treated by the super-wetting film 52 to flow into the drum 51, and the penetrating portion 511 is a through hole or a through groove, and the size and density of the through hole or the through groove are set according to the amount of the supplied liquid. The inclined water outlet 512 is used for allowing liquid in the roller 51 to flow out and generate a rotational flow, so that the incoming liquid acts on the surface of the super-wetting film 52 of the subsequent bionic super-wetting film component 5 in a rotational flow mode to drive the roller 51 and the super-wetting film 52 to rotate, and the subsequent separation effect of oily sewage and crude oil containing water is ensured. In this embodiment, the inclined water outlet hole 512 and the central axis of the drum 51 form an included angle of 30 to 60 degrees, and the sectional area of the inclined water outlet hole 512 is set according to the amount of the incoming liquid.
As shown in fig. 1, the bionic super-wetting membrane parts 5 of the secondary oil removal assembly 2 are four groups. The super-wetting membranes 52 of the four groups of bionic super-wetting membrane components 5 are respectively a demulsification membrane 523, a first hydrophilic oleophobic membrane 524, a heavy metal removal membrane 525 and a desalting membrane 526, and the demulsification membrane 523, the first hydrophilic oleophobic membrane 524, the heavy metal removal membrane 525 and the desalting membrane 526 are sequentially arranged along the conveying direction of the oily sewage. The demulsified oily sewage allows water to flow through by using the first hydrophilic oleophobic membrane 524, blocks oil at the inflow end, and removes heavy metals and salts in the water by using the heavy metal removal membrane 525 and the salt removal membrane 526. The secondary oil removal assembly 2 adopts the super-wetting membrane 52 with the characteristics of demulsification, hydrophilization, oleophobicity, heavy metal ion adsorption and desalination, so that the secondarily treated sewage reaches the standard that the oil content is lower than 10ppm for discharge, does not contain heavy metal and salt, and can be directly injected into farmlands, thereby reducing the transportation energy consumption and treatment burden of downstream pipeline systems, and reducing the environmental pollution.
Furthermore, the mesh numbers of the demulsification membrane 523, the first hydrophilic oleophobic membrane 524, the heavy metal removal membrane 525 and the desalting membrane 526 are sequentially increased, so that the diameter of the molecules/ions filtered from the inlet end to the outlet end of the secondary oil removal assembly 2 is smaller and smaller, and the phenomenon that liquid is retained in the bionic super-infiltration membrane part 5 is avoided. Under the condition that the corresponding super-wetting film 52 has a fixed mesh number, the liquid flow can be controlled by controlling the area of the arc-shaped blades 522 of the super-wetting film 52, and meanwhile, the mesh number of the super-wetting film 52 and the area of the arc-shaped blades 522 of different types are set according to the incoming liquid flow. In this embodiment, non-retention filtration of particles or ions of different sizes can be achieved by controlling the mesh size of the super-wetting membrane 52.
In this embodiment, the bionic super-wetting membrane components 5 of the secondary dewatering component 3 are divided into two groups. The super-wetting membranes 52 of the two groups of bionic super-wetting membrane parts 5 are respectively a demulsification membrane 523 and a first oleophylic hydrophobic membrane 527, and the demulsification membrane 523 and the first oleophylic hydrophobic membrane 527 are sequentially arranged along the conveying direction of the crude oil containing water. The demulsified aqueous crude oil flows through the first oleophylic hydrophobic membrane 527, the oleophylic hydrophobic characteristics of the separation membrane material are utilized to allow the oil to pass through and block the water at the inflow end, and the aqueous crude oil directly flows into a downstream oil pipeline after secondary separation through the demulsification membrane 523 and the first oleophylic hydrophobic membrane 527. Meanwhile, the mesh number of the first oleophylic and hydrophobic membrane 523 is higher than that of the emulsion breaking membrane 527, namely, the invention realizes high-precision separation of the water-containing crude oil and simultaneously avoids the phenomenon that liquid is retained in the bionic super-wetting membrane part 5.
As shown in fig. 1, the oil-gas-water separation device further comprises an oil discharge assembly 6, a water discharge assembly 7 and a waste residue collector 8. The oil discharge assembly 6 comprises an oil discharge pipeline 61 and a second oleophylic hydrophobic membrane 62, the oil discharge pipeline 61 is arranged on the secondary oil removal assembly 2 because the density of oil is less than that of water, and the oil discharge pipeline 61 is positioned above the bionic super-wetting membrane part 5 provided with the emulsion breaking membrane 523 and the first hydrophilic oleophobic membrane 524 so as to discharge the oil separated by the secondary oil removal assembly 2; a second hydrophobic and oleophilic membrane 62 is disposed in the oil drain pipe 61, which allows only oil to pass through, blocking water in the secondary oil removal assembly 2. The drainage assembly 7 comprises a drainage pipeline 71 and a second hydrophilic oleophobic membrane 72, and the drainage pipeline 71 is arranged below the two groups of bionic super-wetting membrane parts 5 of the secondary dewatering assembly 3 because the density of water is greater than that of oil so as to discharge water separated by the secondary dewatering assembly 3; a second hydrophilic oleophobic membrane 72 is provided within drainage conduit 71 that only allows water to pass through, blocking oil in secondary water removal assembly 3. The waste residue collector 8 is arranged below each bionic super-infiltration membrane part 5 to collect the particle impurities, heavy metal impurities, salt and the like removed by the super-infiltration membrane 52.
Further, the secondary deoiling subassembly 2 and the secondary dewatering subassembly 3 of this embodiment still include water oil filtering channel 9, and water oil filtering channel 9 is including feed liquor passageway 91, separation channel 92 and the liquid outlet channel 93 that communicate in proper order. The diameter of the liquid inlet channel 91 is smaller than that of the separation channel 92, the liquid inlet channel 91 is communicated with the separation channel 92 through the conical cyclone section 94, and the bionic super-wetting membrane component 5 is arranged in the separation channel 92. The arrangement of the tapered cyclone section 94 enables oily sewage and crude oil containing water to generate cyclone when entering the secondary oil removal assembly 2 and the secondary water removal assembly 3, incoming liquid acts on the surface of the emulsion breaking membrane 523 in a cyclone mode, and the roller 51 and the emulsion breaking membrane 523 are driven to rotate so as to ensure the separation effect of the subsequent oily sewage and crude oil containing water. In this embodiment, the taper of the conical cyclone section 94 is 30-60 °.
Further, secondary deoiling subassembly 2 still includes the water quality testing part 21 that is used for guaranteeing that quality of water reaches emission standard, and water quality testing part 21 includes water quality testing appearance 211, backflow pipeline 212, three-way valve 213 and check valve 214. Wherein, the water quality detector 211 is arranged on the liquid outlet channel 93 of the secondary oil removing assembly 2; one end of the return pipe 212 is positioned at the downstream of the water quality detector 211 and is communicated with the liquid outlet channel 93, and the other end of the return pipe 212 is positioned at the upstream of the bionic super-infiltration membrane part 5; the three-way valve 213 is arranged at the communication position of the return pipeline 212 and the liquid outlet channel 93; a one-way valve 214 is provided in the return line 212. The water quality detector 211 monitors the water quality after the secondary treatment, if the water quality does not reach the discharge standard, the three-way valve 213 is controlled by the automatic control system to be communicated with the backflow pipeline 212, and the one-way valve 214 is controlled to be opened, so that the water which does not reach the standard flows back to the liquid inlet end of the secondary oil removal assembly 2 through the backflow pipeline 212 for retreatment; if the water quality reaches the discharge standard, the water is directly flowed into the downstream water conveying pipeline. The oil content of the water treated by the secondary oil removal component 2 is lower than 10ppm, the water can be directly discharged into farmlands, the environment pollution is small, the water quality detection is convenient, and the reliability is high.
As shown in fig. 1, the oil-gas-water separation device of the present embodiment further includes a controller, a liquid level detector 13, a gas regulating valve 41, a water outlet regulating valve 22, and an oil outlet regulating valve 31. The liquid level detection piece 13 is arranged in the cyclone cavity 11 to detect the height of the liquid level in the cyclone cavity 11; the gas regulating valve 41 is arranged on a top exhaust pipe 42 of the exhaust assembly 4; the water outlet regulating valve 22 is arranged on the liquid inlet channel 91 of the secondary oil removing assembly 2; the oil outlet regulating valve 31 is arranged on the liquid inlet channel 91 of the secondary dewatering component 3; the input end of the controller is connected with the liquid level detection piece 13, and the output end of the controller is connected with the gas regulating valve 41, the water outlet regulating valve 22 and the oil outlet regulating valve 31. The controller controls the opening degrees of the gas regulating valve 41, the water outlet regulating valve 22 and the oil outlet regulating valve 31 based on the liquid level detection value of the liquid level detector 13. It has guaranteed oil gas water at secondary separation effect and operating stability.
When the liquid level detector 13 detects that the liquid level is too low, the gas amount in the cyclone cavity 11 is too large, the controller controls the opening degree of the gas regulating valve 41 to increase, and controls the opening degrees of the water outlet regulating valve 22 and the oil outlet regulating valve 31 to decrease; when the liquid level detector 13 detects that the liquid level is too high, it indicates that the amount of oil and water in the cyclone chamber 11 is too large, and the controller controls the opening of the water outlet regulating valve 22 and the oil outlet regulating valve 31 to increase and controls the opening of the gas regulating valve 41 to decrease.
Further, the liquid inlet channels 91 of the secondary oil removing assembly 2 and the secondary water removing assembly 3 are respectively provided with a liquid pressure detection piece 10. The liquid pressure detecting member 10 is a first pressure sensor 101, and the first pressure sensor 101 detects the input pressure of the oily water and the aqueous crude oil. The bottom end of the rotational flow cavity 11 is communicated with a bypass pipe 14, and a bypass valve 15 is arranged on the bypass pipe 14. The input of the controller is connected to the first pressure sensor 101 and the output of the controller is connected to the bypass valve 15.
When the first pressure sensor 101 detects that the pressure rises rapidly, which indicates that a blockage occurs in the secondary oil removal assembly 2 or the secondary water removal assembly 3, the controller controls the bypass valve 15 to be opened and controls the water outlet regulating valve 22 and the oil outlet regulating valve 31 to be closed so as to discharge the redundant incoming liquid through the bypass pipe 14; when the first pressure sensor 101 detects that the pressure returns to normal, the controller controls the bypass valve 15 to close, and controls the water outlet regulating valve 22 and the oil outlet regulating valve 31 to open, so as to return to normal operation. The liquid discharge measure is provided when the secondary oil removal assembly 2 or the secondary water removal assembly 3 is blocked, and the liquid discharge measure is convenient to operate and high in safety and reliability.
Further, a second pressure sensor 102 is arranged on the liquid outlet channel 93 of the secondary oil removing assembly 2 or the secondary water removing assembly 3. The second pressure sensor 102 detects the output pressure of the filtered oil-containing sewage and the water-containing crude oil, the detection value of the second pressure sensor 102 is compared with that of the first pressure sensor 101, when the detection value of the second pressure sensor 102 is obviously smaller than that of the first pressure sensor 101, the blockage of the bionic super-wetting membrane part 5 is indicated, and at the moment, the super-wetting membrane 52 of the bionic super-wetting membrane part 5 needs to be replaced. Meanwhile, a gas pressure detection piece 43 is arranged on the top exhaust pipe 42 of the exhaust assembly 4 and is used for detecting the exhaust pressure of the top exhaust pipe 42 in real time.
As shown in FIG. 1, the cyclonic separator 12 is a vaned cyclone. The blades of the vane type swirler are arranged spirally so that the oil-gas-water mixture forms a rotational flow after passing through the blades, and the smooth proceeding of the subsequent secondary separation is ensured. In the embodiment, the included angle between the tangential direction of the blade spiral line and the blade shaft is 15-75 degrees, and parameters such as the number and the angle of the blades are set according to the liquid flow and the liquid property.
In this embodiment, the bottom of the primary separation assembly 1 is provided with a U-shaped input pipe 16, an impurity removal assembly 17, and a demulsification orifice plate 18. Wherein, one end of the U-shaped input pipe 16 is communicated with the bottom of the primary separation assembly 1 so as to input the produced liquid to the cyclone cavity 11. The impurity removing assembly 17 is used for removing solid phase impurities of the produced liquid, the impurity removing assembly 17 comprises a carbon dioxide feed opening 171, a waste residue collecting part 172 and a filter screen 173, wherein the carbon dioxide feed opening 171 is arranged at the liquid inlet end of the U-shaped input pipe 16, carbon dioxide is injected into the produced liquid at the wellhead through the carbon dioxide feed opening 171, so that the concentration of carbonate ions and bicarbonate ions is increased, and the carbonate ions and the bicarbonate ions react with high-concentration calcium ions, magnesium ions and barium ions in the liquid to form precipitates, so that the mineralization degree of the produced liquid is reduced; the filter screen 173 is arranged at the liquid outlet end of the U-shaped input pipe 16 to block solid-phase impurities in the oil-water mixture on the sand screen, so that the effects of sand prevention and filtration of solid-phase small particle impurities are achieved, and secondary solid-liquid separation is realized; the waste residue collecting part 172 is arranged between the carbon dioxide feeding port 171 and the filter screen 173, and the waste residue collecting part 172 is positioned at the bottom of the U-shaped input pipe 16 and is used for collecting solid-phase large-particle impurities in the incoming liquid to realize preliminary solid/liquid-gas separation.
In this embodiment, the demulsification orifice plate 18 is disposed between the output end of the U-shaped input pipe 16 and the swirling flow cavity 11. The produced fluid input by the U-shaped input pipe 16 passes through the demulsification orifice plate 18 to complete demulsification so as to carry out preliminary oil-water separation on the produced fluid. Further, a U-shaped inlet pipe 16 is communicated with the bottom of the cyclone chamber 11 through a vertical inlet pipe, and a bypass pipe 14 is communicated with the vertical inlet pipe.
The oil-gas-water separation device disclosed by the invention separates oil, gas and water by adopting a cyclone and super-infiltration composite principle. Firstly, removing solid-phase impurities in the oil water by adopting an impurity removing assembly 17 in a U-shaped input pipe 16; then, a vane type swirler is adopted to carry out primary separation on oil, gas and water; and then the super-wetting membrane 52 with different characteristics (demulsification, oleophylic hydrophobicity, hydrophilic hydrophobicity and the like) is adopted to perform demulsification and secondary fine separation on the sewage and oil obtained by primary separation. The combination of the cyclone separator 12 and the bionic super-wetting membrane component 5 is adopted, so that the oil-gas-water separation speed is high, and the separation precision is high.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The oil-gas-water separation device is characterized by comprising a primary separation component for performing primary separation of oil, gas and water on produced liquid, a secondary oil removal component for performing emulsion breaking and separation on primary separated oily sewage, a secondary water removal component for performing emulsion breaking and separation on primary separated oily crude oil, and an exhaust component for exhausting primary separated gas, wherein the primary separation component comprises a cyclone cavity and a cyclone separator arranged in the cyclone cavity, and the secondary oil removal component is positioned below the secondary water removal component and is communicated with the cyclone cavity; the exhaust assembly is communicated with the top end of the rotational flow cavity.
2. The oil-gas-water separation device according to claim 1, wherein the secondary oil removal assembly and the secondary water removal assembly each comprise a bionic super-wetting membrane component, the bionic super-wetting membrane component comprises a roller and super-wetting membranes with different separation characteristics, and each super-wetting membrane comprises a wetting membrane body covering the surface of the roller and a plurality of arc-shaped blades circumferentially arranged along the wetting membrane body; the roller is provided with a through part for the liquid treated by the super-wetting film to flow into the roller and an inclined water outlet hole for the liquid in the roller to flow out and generate a rotational flow.
3. The oil-gas-water separation device according to claim 2, wherein the bionic super-wetting membrane components of the secondary oil removal assembly are four groups, the super-wetting membranes of the four groups of bionic super-wetting membrane components are respectively a demulsification membrane, a first hydrophilic oleophobic membrane, a heavy metal removal membrane and a desalting membrane which are sequentially arranged along the conveying direction of the oily sewage, and the mesh number of the super-wetting membranes is sequentially increased along the conveying direction of the oily sewage; the bionic super-infiltration membrane components of the secondary dewatering component are divided into two groups, the super-infiltration membranes of the two groups of bionic super-infiltration membrane components are respectively a demulsification membrane and a first oleophylic hydrophobic membrane which are sequentially arranged along the conveying direction of the water-containing crude oil, and the mesh number of the first oleophylic hydrophobic membrane is higher than that of the demulsification membrane.
4. The oil-gas-water separation device according to claim 3, further comprising an oil discharge assembly for discharging oil separated by the secondary oil removal assembly, a water discharge assembly for discharging water separated by the secondary water removal assembly, and a waste residue collector for collecting impurities removed by the super-wetting membrane, wherein the oil discharge assembly comprises an oil discharge pipeline and a second oleophylic hydrophobic membrane, the oil discharge pipeline is arranged on the secondary oil removal assembly and is positioned above the bionic super-wetting membrane part provided with the emulsion breaking membrane and the first hydrophilic oleophobic membrane, and the second oleophylic hydrophobic membrane is arranged in the oil discharge pipeline; the drainage assembly comprises a drainage pipeline and a second hydrophilic oleophobic membrane, the drainage pipeline is arranged on the secondary dewatering assembly and is positioned below the two groups of bionic super-wetting membrane components, and the second hydrophilic oleophobic membrane is arranged in the drainage pipeline; the waste residue collector is arranged below each bionic super-infiltration membrane component.
5. The oil-gas-water separation device according to any one of claims 2 to 4, wherein the secondary oil removal assembly and the secondary water removal assembly further comprise a liquid inlet channel, a separation channel and a liquid outlet channel which are sequentially communicated, the diameter of the liquid inlet channel is smaller than that of the separation channel, and the liquid inlet channel is communicated with the separation channel through a conical cyclone section; the bionic super-infiltration membrane part is arranged in the separation channel.
6. The oil-gas-water separation device according to claim 5, wherein the secondary oil removal assembly further comprises a water quality detection part for ensuring that the water quality meets the emission standard, the water quality detection part comprises a water quality detector, a backflow pipeline, a three-way valve and a one-way valve, and the water quality detector is arranged on a liquid outlet channel of the secondary oil removal assembly; one end of the return pipeline is positioned at the downstream of the water quality detector, and the other end of the return pipeline is positioned at the upstream of the bionic super-infiltration membrane component; the three-way valve is arranged at the communication position of the backflow pipeline and the liquid outlet channel; the check valve is arranged in the return pipeline.
7. The oil-gas-water separation device according to any one of claims 1 to 4, further comprising a controller, a liquid level detection piece for detecting the liquid level in the cyclone chamber, a gas regulating valve arranged on the exhaust assembly, a water outlet regulating valve arranged at the liquid inlet end of the secondary oil removal assembly, and an oil outlet regulating valve arranged at the liquid inlet end of the secondary water removal assembly; the input end of the controller is connected with the liquid level detection piece, and the output end of the controller is connected with the gas regulating valve, the water outlet regulating valve and the oil outlet regulating valve; and the controller controls the opening of the gas regulating valve, the water outlet regulating valve and the oil outlet regulating valve according to the liquid level detection value of the liquid level detection piece.
8. The oil-gas-water separation device according to claim 7, wherein the liquid inlet ends of the secondary oil removal assembly and the secondary water removal assembly are respectively provided with a pressure sensor for detecting input pressure; the bottom end of the rotational flow cavity is communicated with a bypass pipe, and a bypass valve is arranged on the bypass pipe; the input end of the controller is connected with the pressure sensor, and the output end of the controller is connected with the bypass valve; when the pressure sensor detects that the pressure rises rapidly, the controller controls the bypass valve to be opened and controls the water outlet regulating valve and the oil outlet regulating valve to be closed.
9. The oil-gas-water separation device as claimed in any one of claims 1 to 4, wherein the cyclone separator is a blade type cyclone, blades of the blade type cyclone are arranged in a spiral shape, and the included angle between the tangential direction of the blade spiral line and the blade axis is 15-75 degrees.
10. The oil-gas-water separation device as claimed in any one of claims 1 to 4, wherein the bottom of the primary separation component is provided with a U-shaped input pipe for inputting produced fluid to the cyclone cavity, an impurity removal component for removing solid-phase impurities in the produced fluid, and a demulsification pore plate for performing primary oil-water separation on the produced fluid, wherein the U-shaped input pipe is communicated with the bottom of the primary separation component; the impurity removing assembly comprises a carbon dioxide feeding port, a waste residue collecting piece and a filter screen which are sequentially arranged along the liquid inlet direction to the liquid outlet direction of the U-shaped input pipe; the demulsification pore plate is arranged between the output end of the U-shaped input pipe and the rotational flow cavity.
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| CN110713226B (en) | 2021-11-23 |
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