CN111171859B - Sectional type electromagnetic coupling separator for treating oilfield produced liquid - Google Patents
Sectional type electromagnetic coupling separator for treating oilfield produced liquid Download PDFInfo
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- CN111171859B CN111171859B CN202010029116.3A CN202010029116A CN111171859B CN 111171859 B CN111171859 B CN 111171859B CN 202010029116 A CN202010029116 A CN 202010029116A CN 111171859 B CN111171859 B CN 111171859B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/02—Dewatering or demulsification of hydrocarbon oils with electrical or magnetic means
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- 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
- B01D17/06—Separation of liquids from each other by electricity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
Abstract
A sectional type electromagnetic coupling separator for treating oilfield produced liquid comprises a separator tank body, a gas-liquid separation module, a high-water-content electromagnetic synergistic dehydration module, a low-water-content electric dehydration module, a power supply system, a liquid level controller, a gas outlet, an oil collecting pipe and a water outlet. The separator tank body is horizontally arranged, and the gas-liquid separation module, the high water content electromagnetic synergistic dehydration module, the low water content electric dehydration module and the liquid level controller are sequentially arranged inside the separator main body. The gas-liquid separation module consists of an inlet rectifier tube and a baffle, the high-water-content electromagnetic synergistic dehydration module consists of a magnet and an electrode part, and the low-water-content electric dehydration module consists of a plurality of vertical electrode plates which are arranged in parallel. The invention realizes the four-stage separation design of oil, gas and water by the three modules and the gravity settling module in the horizontal cylinder, and has the advantages of compact structure, high separation efficiency and thorough separation. In addition, the method can also treat oil-water emulsion with wide water content range, and greatly improve the dehydration rate of crude oil.
Description
Technical Field
The invention belongs to the technical field of multiphase separation of oil-gas gathering and transportation systems, and particularly relates to a sectional type electromagnetic coupling separator for treating oil field produced liquid.
Background
At present, most oil fields in China mainly adopt a mode of combining a gravity type three-phase separator and an electric dehydrator to carry out gas-liquid separation and crude oil demulsification. But as the oil field gradually enters the middle and later development stages, the water content of the produced liquid is increased rapidly, and the contents of asphaltene, colloid and paraffin in the produced substances are high; meanwhile, the emulsification of crude oil is seriously aggravated by the wide application of tertiary oil recovery technologies such as chemical flooding and the like, and great challenges are brought to oil-water separation. The traditional three-phase separator based on the gravity settling and electric dehydration principles is difficult to effectively break and separate crude oil emulsion with high emulsification degree, and the use of a subsequent electric dehydrator is seriously influenced.
The traditional electric dehydrator applies high voltage to a metal bare electrode, utilizes a polarization effect to promote water drops to approach each other, improves the collision frequency and strength of the water drops, strengthens coalescence of the water drops in oil, and has obvious effect on treating low-water-content crude oil emulsion. However, in the electric dehydrator, the electrostatic coalescence process and the gravity settling process of water droplets are performed simultaneously, and a laminar flow state needs to be maintained in order to ensure the separation effect, so that the volume of the treatment equipment is large, and the separation efficiency is difficult to further improve. Meanwhile, due to the high water content and high conductivity of the crude oil treated by the upstream gravity type three-phase separator, on one hand, the original volume of the electric dehydrator cannot meet the requirement of the retention time of the oil-water emulsion, and on the other hand, the electric field collapse phenomenon frequently occurs due to the use of a metal bare electrode, so that the safe and stable operation of the electric dehydrator cannot be ensured.
The gas-liquid multiphase flow widely exists in various mixing and transportation pipelines, the slug flow is positioned in the middle area of a multiphase flow pattern diagram, and various other multiphase flow pattern areas are bordered, so that the multiphase flow pattern is the most common flow pattern with the greatest harm in the oil-gas mixing and transportation process. Slug flow can have a very adverse effect on downstream separation and processing facilities. Conventional horizontal separator inlets often treat this flow pattern too coarsely or not.
According to the experimental research of oil-water separation of oil-containing seawater by utilizing an electromagnetic separation principle in 2003, Takeda et al in Japan act on an aqueous phase by electromagnetic force based on the difference of conductive properties between seawater and oil, so that the seawater generates buoyancy on oil drops, and the separation of the oil drops and the seawater is realized.
US7749459B2 discloses an electrostatic coalescing device placed at the inlet of a conventional gravity separator. The device is formed by casting tubular channels, flat electrodes and a transformer which are arranged along the flowing direction of fluid by epoxy resin. The device can efficiently process the crude oil with high water content without increasing the volume of the original separator, but the crude oil processed by the device still cannot meet the export requirement and needs further deep dehydration treatment. Chinese patent CN103849428A discloses a magnetic electric field emulsion breaker, which generates a magnetic field and an electric field along a metal pipeline, wherein a central electrode and an annular electrode fence in the form of an interlayer are connected with a power supply transformer through an electrode rod, the electrode is fixed on the top of the flanged metal pipe section through an insulating hanger, the metal pipe section is grounded, and the magnetic field is generated by an annular magnet located inside or outside the metal pipe section. The center electrode and the annular electrode bars of the device are bare metal electrodes, when the water content of the emulsion is higher or the voltage is higher, the electric field collapse effect caused by water drop chain conduction or dielectric breakdown can occur, the device is only suitable for the emulsion with lower water content, and the electric field intensity is limited.
In summary, aiming at the problems that the traditional three-phase separator has low oil-gas-water separation efficiency, the electrodes are easy to break down, the high-water-content crude oil emulsion cannot be efficiently treated, an accurate water layer monitoring system is not available, and the inlet often has too rough treatment or no treatment on the slug flow which is a harmful flow pattern, the invention needs to invent the high-efficiency separator which has obvious dehydration effect on the high-water-content and high-emulsion crude oil emulsion and high dehydration efficiency.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the sectional type electromagnetic coupling separator for treating the oilfield produced fluid, which is combined with the gas-liquid separation module, the high-water-content electromagnetic synergistic dehydration module, the low-water-content electric dehydration module and the gravity settling module, can effectively treat the high-water-content crude oil emulsion, improves the dehydration efficiency, and can overcome the phenomena of electric field collapse and polar plate breakdown. Meanwhile, the rectifying section at the inlet can also eliminate slug flow, so that gas-liquid pre-separation at the inlet is improved, and interference on subsequent separation is reduced. Has the advantages of compact structure, high separation efficiency and thorough separation.
The technical scheme adopted by the invention is as follows:
a sectional type electromagnetic coupling separator for treating oilfield produced liquid. The device comprises a separator main body, a gas-liquid separation module, a high water content electromagnetic synergistic dehydration module, a low water content electric dehydration module, a power supply system, a liquid level controller, a gas outlet, an oil collecting pipe and a water outlet.
The oil-gas-water separator is characterized in that the tank body is horizontally placed, an oil-gas-water inlet is formed in the upper portion of one end of the tank body, the oil-gas-water inlet pipe is composed of a horizontal straight pipe, an expanding pipe and a declination bent pipe, the cross section of the horizontal straight pipe is circular, the expanding angle of the expanding pipe ranges from 10 degrees to 20 degrees, the declination angle of the declination bent pipe ranges from 25 degrees to 30 degrees, and the vertical height of the declination bent pipe ranges from 1.5 meters to 2 meters. Import baffle is located and is the level setting under the entry rectifier tube export on the internal side wall of jar, installs gas outlet behind the entry rectifier tube gas outlet below is provided with the mist trap. And a vertical baffle plate is arranged behind the gas outlet, and the lower end of the baffle plate is slightly lower than the horizontal baffle plate.
The high-water-content electromagnetic synergistic dehydration module is positioned inside the cylinder, the right side of the gas-liquid separation module is composed of a magnet and an electrode part, the magnet at the top of the module is fixedly connected with the top of the inner wall of the horizontal cylinder, and the magnet at the bottom is fixed on the inner wall at the bottom of the cylinder. Magnet units in the high water-containing electromagnetism synergistic effect dehydration module are placed along axis direction level for the magnetic field direction level in the middle of two magnets is by the S utmost point of N utmost point direction right, applys the magnetic field in X axle positive direction promptly, and the plate electrode is fixed on both ends inner wall around the barrel, is connected through the cable with external power source' S positive and negative end, makes electric field direction perpendicular to paper inwards and perpendicular with the magnetic field direction quadrature, applys the electric field in Y axle positive direction promptly. And a compact insulating layer is coated on the surface of the electrode plate.
The low-water-content electric dehydration module is positioned on the right side of the high-water-content electromagnetic synergistic dehydration module in the barrel and consists of a plurality of vertical electrode plates which are arranged in parallel, the electrode plates are hung vertically, the dehydration electric field is distributed horizontally, the surface of the electrode plates is coated with a compact insulating layer, and small holes are uniformly distributed on the electrode plates, so that the fluid can conveniently pass through the low-water-content electric dehydration module. The top of the electrode plate is fixedly connected with the inner wall of the horizontal cylinder through a suspension.
The liquid level controller is positioned at the rightmost side of the tank body and consists of an oil-water interface detection part and a water outlet, and the height of the oil-water interface can be cooperatively controlled. The liquid level controller measures the liquid level by a buoyancy method, the floater is made into a hollow rigid body and connected with the spring motor, and the diameter of the floater should be properly increased so that the floater can float on the liquid level when in balance.
The power supply system is positioned at the top of the tank body and consists of a high-voltage high-frequency rectangular wave pulse power supply and a step-up transformer. The transformer is 100: 1 step-up transformer. The high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module are connected through cables.
The invention has the beneficial effects that:
(1) through gas-liquid separation module, high moisture electromagnetism synergistic effect dehydration module, low moisture electric dehydration module and gravity settling module, can the high moisture crude oil emulsion of efficient processing, improve dehydration efficiency, have compact structure, separation efficiency is high, separates thorough advantage.
(2) The change of the geometrical structures such as diameter expansion, decline and the like of the inlet of the separator is beneficial to the conversion of the slug flow direction stratified flow, and the gas-liquid separation effect can be improved to a great extent. And the stable inlet rectification improves the pre-separation degree of the inlet, reduces the interference on the subsequent separation and greatly improves the separation effect. Because the mobility of gas is better, therefore gas can change original flow direction when meetting the barrier plate, flows to other directions, and liquid continues the downstream because of gravity reason, so lie in the horizontal setting under the entry fairing export and be in baffle on the internal side wall of jar can carry out primary separation to profit with gas. Be provided with perpendicular baffle behind the gas outlet, and the lower extreme of baffle is less than horizontal baffle a little, and the gas that is changed flow direction by horizontal baffle like this and remaining not will be blockked by the baffle from a small amount of gas outlet exhaust, has avoided the interference of gas to the liquid level, makes the profit liquid level undulant little, guarantees the safety and stability of electromagnetic field, ensures the stable high-efficient operation of dehydration.
(3) The synchronous synergistic effect of the electric field and the magnetic field is adopted to carry out primary separation on the oil-water emulsion, the motion trail of water drops in oil under the combined action of the electric field and the magnetic field is changed into three-dimensional spiral motion with high degree of freedom from near-plane reciprocating motion with short free stroke, the collision probability of a liquid drop group is increased, the particle size of water drops can be increased by about ten times in a few seconds, the dehydration speed is greatly increased, and the coalescence-separation process of a water phase from a multiphase system is accelerated. In addition, the magnetic field changes the adsorption rate of water molecules on the surface of wax molecules, so that the hydrophobic property of wax crystals is enhanced, crystal grains are easier to migrate on an oil-water interface under the action of an electric field, the stability of the oil-water emulsion is reduced, and oil-water separation is promoted. Namely, under the synchronous synergistic action of the electric field and the magnetic field, the efficient coalescence of water drops in the oil can be realized.
(4) The low-water-content electric dehydration module adopts a vertical hanging electrode plate, and a dehydration electric field is distributed horizontally. The emulsified water in the crude oil in the electric field is vertical to each other under the action of the electric field and the gravitational field. When the direction of the electric field is orthogonal to the direction of the water drop settlement, the electrostatic coalescence probability of the water drops is higher, the dehydration effect is better, and conditions are created for the coalescence of the emulsified water, so that the coalescence speed of the crude oil emulsified water in the electric field can be improved, and the treatment capacity of the crude oil electric dehydrator can be improved by 30 percent compared with that of a horizontal hanging electrode electric dehydrator under the same condition.
(5) The electrode plate surfaces of the electrode units of the high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module are coated with compact insulating layers, so that electric breakdown can be effectively prevented. And the electrode plate surface of the low-water-content electric dehydration module electrode unit is uniformly distributed with small holes for the fluid to pass through.
(6) The oil-water interface detection adopts a float type interface detection method. And the oil-water interface height is cooperatively controlled under the circulation action of a water outlet. The problem of electric breakdown caused by the fact that the electrode plate is submerged due to severe fluctuation of the water level is avoided, and stable and safe operation of the high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a segmented electromagnetically coupled separator for treating oilfield production fluids, where E and B represent electric and magnetic fields, respectively.
FIG. 2 is a schematic diagram of an electrode plate of an electrode unit of a low water content electric dehydration module
FIG. 3 is a partial cross-sectional view of the present invention
1-tank body, 2-horizontal straight pipe, 3-expanding pipe, 4-downward inclined bent pipe, 5-baffle, 6-mist catcher, 7-air outlet pipe, 8-transformer, 9-vertical partition plate, 10-magnet, 11-electrode plate, 12-power supply, 13-suspension, 14-hanging electrode plate, 15-spring motor, 16-floater, 17-control valve, 18-oil collecting pipe, 19-water outlet pipe and 20-small hole.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Referring to fig. 1-3, a sectional electromagnetic coupling separator for treating oilfield produced fluid is characterized by comprising a tank body 1 and a horizontal straight pipe 2 which are horizontally placed, wherein the horizontal straight pipe 2 is connected with the upper end of a declination elbow 4 through an expanding pipe 3, the lower end of the declination elbow 4 is introduced into the tank body 1 from the upper part of the front end part of the tank body 1, a horizontal baffle 5 is arranged in the tank body 1 and is positioned right below the lower port of the declination elbow 4, an air outlet pipe 7 is arranged at the top of an inner cavity of the tank body 1 and is positioned behind the declination elbow 4, and a mist catcher 6 positioned in the tank body 1 is arranged at the inlet of the air outlet pipe 7; a vertical partition plate 9 is arranged in the tank body 1 at the rear part of the mist catcher 6, and the upper edge of the vertical partition plate 9 is connected with the inner wall of the top of the tank body 1;
a high-water-content electromagnetic synergistic dehydration module is arranged in the tank body 1 behind the baffle 5 and comprises two groups of magnets 10 and two electrode plates 11, wherein the two groups of magnets 10 are respectively arranged at the top and the bottom of the module and are respectively fixed on the inner walls of the top and the bottom of the tank body 1;
the two groups of magnets 10 are horizontally arranged along the axial direction of the tank body 1, so that the magnetic field directions of the two groups of magnets 10 are horizontally directed backwards from the N pole to the S pole; the two electrode plates 11 are respectively positioned at the left side and the right side of the module, are respectively fixed on the inner walls at the two sides of the tank body 1, and are connected with the positive end and the negative end of an external power supply through cables, so that the direction of an electric field is orthogonal to the direction of a magnetic field;
the low-water-content electric dehydration module is arranged in the tank body 1 and positioned behind the high-water-content electromagnetic synergistic dehydration module and comprises a plurality of vertically-arranged and mutually-parallel hanging electrode plates 14, and the tops of the hanging electrode plates 14 are fixedly connected with the inner wall of the tank body 1 through suspension brackets 13 and are connected with the positive end and the negative end of an external power supply through cables;
a liquid level control device is also arranged in the tank body 1 at the position behind the low water content electric dehydration module;
and an oil collecting pipe 19) is fixed at the top of the tank body 1, and the interface of the oil collecting pipe 19 and the tank body 1 is positioned above the low-water-content electric dehydration module.
The sectional type electromagnetic coupling separator for treating oilfield produced fluid is characterized in that the cross section of the horizontal straight pipe 2 is circular, the diameter expansion angle of the gradually expanding pipe 3 is 10-20 degrees, the downward inclination angle of the downward inclination bent pipe 4 is 25-30 degrees, and the vertical height of the downward inclination bent pipe is 1.5-2 meters.
The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that the lower end of the vertical partition plate 9 is lower than the horizontal baffle plate 5.
The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that the hanging electrode plate 13 is a rectangular plate with small holes 20 uniformly distributed on the surface, and the rectangular plate is perpendicular to the axis of the tank body 1.
The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that a dense insulating layer is coated on the surface of the electrode plate 11.
The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that the surface of the hanging electrode plate 14 is coated with a compact insulating layer.
The sectional electromagnetic coupling separator for treating oilfield produced liquid is characterized in that the external power supply is positioned at the top of the tank body and consists of a high-voltage high-frequency rectangular wave pulse power supply 12 and a step-up transformer 8.
The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that the boosting transformer 8 is 100: 1 step-up transformer.
The sectional type electromagnetic coupling separator for treating the oilfield produced liquid is characterized in that the liquid level control device comprises a liquid level detector positioned in the tank body and a water outlet pipe 18 which is positioned at the bottom of the rear part of the tank body 1 and is provided with a control valve 17, the control valve 17 is controlled by the liquid level detector, and the liquid level detector sends an opening or closing instruction to the control valve 17 according to a measured liquid level signal so as to control the height of an oil-water interface.
The sectional electromagnetic coupling separator for treating oilfield produced fluid is characterized in that the liquid level detector adopts the principle of measuring the liquid level by a buoyancy method, and comprises a hollow rigid float 16, wherein the float 16 is connected with a spring motor 15 and then hung on the top wall of the interior of a tank body 1, and the diameter of the float 16 is enough to float on the liquid level in the tank body 1.
The invention is suitable for the oil-gas-water separation process of the produced liquid of the onshore and offshore oil fields, realizes gas-liquid separation and oil-water demulsification, and has the advantages of compact structure, high separation efficiency and thorough separation. The novel separator couples the electric field and the magnetic field, so that the novel separator can treat oil-water emulsion with wide water content range and greatly improve the dehydration rate of crude oil.
Examples
The functional effects of the present invention will be specifically described below by way of examples.
As shown in figure 1, the sectional type electromagnetic coupling separator for treating oilfield produced fluid comprises a separator main body, a gas-liquid separation module, a high-water-content electromagnetic synergistic dehydration module, a low-water-content electric dehydration module, a power supply system, a liquid level controller, a gas outlet, an oil collecting pipe and a water outlet.
The separator tank body 1 is horizontally arranged, an oil-gas-water inlet is formed in the upper portion of one end of the separator tank body, and the oil-gas-water inlet pipe is composed of a horizontal straight pipe 2, an expanding pipe 3 and a declination bent pipe 4, wherein the cross section of the horizontal straight pipe 2 is circular, the expanding angle of the expanding pipe 3 is 10-20 degrees, the declination angle of the declination bent pipe 4 is 25-30 degrees, and the height of the declination bent pipe is 1.5-2 meters. Import baffle 5 is located the level setting under the entry rectifier tube export and is in on the internal side wall of jar, install gas outlet 7 behind the entry rectifier tube gas outlet below is provided with mist trap 6. A vertical baffle is also mounted behind the gas outlet. After the oil-gas-water three-phase flow is rectified by the inlet, the slug flow direction is converted in a layered flow mode, stable layered flow is obtained, the mixing of gas and liquid phases and the shearing emulsification of oil and water are reduced, the buffering effect is guaranteed, then the oil-water emulsion flows downwards due to gravity when encountering the baffle 5, and gas flows to other directions due to good fluidity and is discharged from the gas outlet 7 after flowing through the mist catcher 6, so that the first separation of oil, water and gas is realized. And the gas which is not discharged through the gas outlet 7 is less remained and is blocked by the vertical partition plate 9, so that the influence on the oil-water liquid level is avoided, and the stable and efficient operation of dehydration is ensured.
The high-water-content electromagnetic synergistic dehydration module is positioned inside the cylinder, the right side of the gas-liquid separation module is composed of a magnet 10 and an electrode 11, the magnet at the top of the module is fixedly connected with the inner wall of the horizontal cylinder, and the magnet at the bottom of the module is fixed on the inner wall of the bottom of the cylinder. Magnet unit 10 in the high moisture electromagnetism synergistic effect dehydration module is placed along axis direction level for the magnetic field direction level in the middle of two magnets is right, applys the magnetic field in X axle positive direction promptly, and electrode plate 11 is vertical fixed to be placed on both ends inner wall around the barrel, is connected through the cable with external power source 12's positive and negative end, makes electric field direction and magnetic field direction quadrature, and perpendicular paper is inwards, applys the electric field in Y axle positive direction promptly. When the mixed liquid of oil and water enters the interaction area of the electric field and the magnetic field, all electrified water micelles move downwards under the action of electromagnetic force, oil drops in water are not conductive and are not under the action of electromagnetic force, but the water micelles around the oil droplets move downwards and are extruded to obtain upward buoyancy, and the force is equal to the electromagnetic force in magnitude and opposite in direction. Therefore, at the oil droplet of high moisture electromagnetism synergistic effect dehydration module population evenly distributed in aqueous, at the passageway in-process between magnet 10, constantly receive the effect of buoyancy and concentrate to the upper strata, at high moisture electromagnetism synergistic effect dehydration module exit, the oil-water divide into two-layerly, and the upper strata is the oil reservoir, and the lower floor is the water layer to realize oil-water separation. Some substances in the magnetic field are in a magnetized state under the action of the magnetic field, and the properties of the substances after magnetic treatment are changed to different degrees, mainly manifested by the reduction of the interfacial tension of oil layer water of crude oil and the reduction of the viscosity of the crude oil and emulsion thereof; partial molecular groups of the demulsifier are broken up, so that the demulsification effect of the demulsifier is improved. Under the above functions, the magnetic treatment greatly improves the crude oil dehydration effect.
The low-water-content electric dehydration module is positioned on the right side of the high-water-content electromagnetic synergistic dehydration module in the cylinder and consists of a plurality of vertical electrode plates 14 which are arranged in parallel, the electrode plates are vertically hung, and the dehydration electric field is horizontally distributed, so that the emulsified water in the crude oil in the electric field is mutually vertical under the action force of the electric field and the gravity field. The surface of the electrode plate is coated with a compact insulating layer, and small holes 20 are uniformly distributed on the surface of the electrode plate, so that the fluid can conveniently pass through the low water-containing electric dehydration module. The top of the electrode plate is fixedly connected with the inner wall of the horizontal cylinder through a suspension 13. When the electrode plates are vertically placed, the forming direction of the water chains is orthogonal to the settling direction of water drops, and after the water drops in the water chains are converged, large water drops can approach other water drops in the settling process in the electric field direction (horizontal direction) due to the difference of the settling speeds of the water drops with different particle sizes, and are converged under the action of dipole coalescence force.
The power supply system is positioned at the top of the tank body and consists of a high-voltage high-frequency rectangular wave pulse power supply 12 and a step-up transformer 8. The transformer 8 is 100: 1 step-up transformer. The high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module are connected through cables. The low-voltage alternating-current pulse power output by the power supply 12 is converted into high-voltage power by the step-up transformer and then provides a high-voltage power supply for the high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module.
And finally, discharging large water drops subjected to four-stage separation from a water outlet at the bottom of the cylinder body, and discharging the oil drops from an oil outlet through an oil collecting hole and an oil collecting pipe.
The liquid level controller is positioned at the rightmost side of the tank body and consists of an oil-water interface detection part and a water outlet, the height of the oil-water interface is controlled in a circulating cooperative mode, the problem of electric breakdown caused by submerging a plate electrode due to severe fluctuation of the water level is avoided, and the stable and safe operation of the high-water-content electromagnetic synergistic dehydration module and the low-water-content electric dehydration module is guaranteed. The liquid level controller measures the liquid level by a buoyancy method, the floater 16 is made into a hollow rigid body, the diameter of the floater is properly increased, and the floater is connected with the spring motor 15 together, so that the floater can float on the liquid level when in balance. Once the liquid level rises, the float 16 floats up to open the control valve 17 at the large water outlet so that the liquid level drops.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.
Claims (10)
1. A sectional type electromagnetic coupling separator for treating oilfield produced liquid is characterized by comprising a tank body (1) and a horizontal straight pipe (2) which are horizontally placed, wherein the horizontal straight pipe (2) is connected with the upper end of a declination elbow (4) through an expanding pipe (3), the lower end of the declination elbow (4) is introduced into the tank body (1) from the upper part of the front end part of the tank body (1), a baffle (5) is arranged in the tank body (1) and is positioned right below the lower port of the declination elbow (4), an air outlet pipe (7) is arranged at the position, behind the declination elbow (4), of the top of an inner cavity of the tank body (1), and a mist catcher (6) positioned in the tank body (1) is arranged at the inlet of the air outlet pipe (7); a vertical partition plate (9) is arranged in the tank body (1) and behind the mist catcher (6), and the upper edge of the vertical partition plate (9) is connected with the inner wall of the top of the tank body (1);
a high-water-content electromagnetic synergistic dehydration module is arranged in the tank body (1) at the rear part of the baffle (5) and comprises two groups of magnets (10) and two electrode plates (11), wherein the two groups of magnets (10) are respectively arranged at the top and the bottom of the module and are respectively fixed on the inner walls of the top and the bottom of the tank body (1);
the two groups of magnets (10) are horizontally arranged along the axial direction of the tank body (1), so that the magnetic field directions of the two groups of magnets (10) are horizontally backwards directed to the S pole from the N pole; the two electrode plates (11) are respectively positioned at the left side and the right side of the module, are respectively fixed on the inner walls at the two sides of the tank body (1), and are connected with the positive end and the negative end of an external power supply through cables, so that the direction of an electric field is orthogonal to the direction of a magnetic field;
the low-water-content electric dehydration module is arranged in the tank body (1) and is positioned behind the high-water-content electromagnetic synergistic dehydration module, the low-water-content electric dehydration module comprises a plurality of vertically-arranged and mutually-parallel hanging electrode plates (14), and the tops of the hanging electrode plates (14) are fixedly connected with the inner wall of the tank body (1) through suspension brackets (13) and are connected with the positive end and the negative end of an external power supply through cables;
a liquid level control device is also arranged in the tank body (1) at the position behind the low water content electric dehydration module;
an oil collecting pipe (19) is fixed at the top of the tank body (1), and the interface of the oil collecting pipe (19) and the tank body (1) is positioned above the low-water-content electric dehydration module.
2. The sectional electromagnetic coupling separator for treating oilfield produced fluid according to claim 1, wherein the cross section of the horizontal straight pipe (2) is circular, the diameter expansion angle of the diameter expansion pipe (3) is between 10 degrees and 20 degrees, the downward inclination angle of the downward inclination bent pipe (4) is between 25 degrees and 30 degrees, and the vertical height of the downward inclination bent pipe is 1.5 meters to 2 meters.
3. A segmented electromagnetically coupled separator for treating oilfield production fluids as claimed in claim 1, wherein the lower end of the vertical partition (9) is below the level of the baffle (5).
4. The sectional type electromagnetic coupling separator for treating the oilfield produced fluid is characterized in that the hanging electrode plate (14) is a rectangular plate with small holes (20) uniformly distributed on the surface, and the rectangular plate is perpendicular to the axis of the tank body (1).
5. The segmented electromagnetic coupling separator for treating oilfield produced fluids according to claim 1, wherein the surface of the electrode plate (11) is coated with a dense insulating layer.
6. The segmented electromagnetically coupled separator for treating oilfield production fluids as claimed in claim 1, wherein said suspended electrode plate (14) is coated with a dense insulating layer on its surface.
7. The segmented electromagnetically coupled separator for treating oilfield produced fluids as claimed in claim 1, wherein the external power source is located at the top of the tank and comprises a high voltage high frequency square wave pulse power source (12) and a step-up transformer (8).
8. The segmented electromagnetically coupled separator for treating oilfield production fluids as claimed in claim 7, wherein the step-up transformer (8) is 100: 1 step-up transformer.
9. A segmented electromagnetically coupled separator for treating oilfield production fluids as claimed in claim 1, wherein the level control means comprises a level detector located in the tank and a water outlet pipe (18) with a control valve (17) located at the rear bottom of the tank (1), the control valve (17) being controlled by the level detector, the level detector sending an open or close command to the control valve (17) according to the measured level signal to control the oil-water interface height.
10. The segmented electromagnetically coupled separator for treating oilfield produced fluids according to claim 9, wherein the level detector uses the principle of buoyancy to measure the level of the fluid, and comprises a hollow rigid float (16), the float (16) is connected with the spring motor (15) and then suspended from the top wall of the interior of the tank (1), and the diameter of the float (16) is sufficient to float on the fluid level in the tank (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN103977628A (en) * | 2014-03-26 | 2014-08-13 | 嘉兴市绿能废弃油脂回收有限公司 | Separation method for oil-water slag generated during refining of swill-cooked dirty oil |
| CN204550479U (en) * | 2015-03-19 | 2015-08-12 | 中国海洋石油总公司 | A kind of oil field mining liquid oil and gas and water is from integrated apparatus |
| CN206325258U (en) * | 2016-11-17 | 2017-07-14 | 中国海洋石油总公司 | A kind of three phase separator applied to offshore oilfield thermal recovery |
| CN107723020A (en) * | 2017-11-22 | 2018-02-23 | 中国石油大学(华东) | A kind of oil gas water three phase electrostatic coalescence separator |
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| CN103977628A (en) * | 2014-03-26 | 2014-08-13 | 嘉兴市绿能废弃油脂回收有限公司 | Separation method for oil-water slag generated during refining of swill-cooked dirty oil |
| CN204550479U (en) * | 2015-03-19 | 2015-08-12 | 中国海洋石油总公司 | A kind of oil field mining liquid oil and gas and water is from integrated apparatus |
| CN206325258U (en) * | 2016-11-17 | 2017-07-14 | 中国海洋石油总公司 | A kind of three phase separator applied to offshore oilfield thermal recovery |
| CN107723020A (en) * | 2017-11-22 | 2018-02-23 | 中国石油大学(华东) | A kind of oil gas water three phase electrostatic coalescence separator |
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