CN114804393A - Device and method for removing oil and impurities from oilfield reinjection water - Google Patents
Device and method for removing oil and impurities from oilfield reinjection water Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
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Abstract
The invention belongs to the technical field of oil removal and impurity removal of oilfield reinjection water, and particularly relates to a device and a method for oil removal and impurity removal of oilfield reinjection water. The device comprises a sewage settling tank, a horizontal oil-water separator connected with the sewage settling tank, a filter connected with the horizontal oil-water separator, a refined essential oil-water separator connected with the filter, and a precision filter connected with the refined essential oil-water separator; the sewage settling tank comprises an inner tank and an outer tank, a cyclone separator is arranged in the inner tank, and the oilfield reinjection water is injected into the cyclone separator to be separated into water, oil and slurry; the horizontal oil-water separator comprises a hydrocyclone separator, a coarse graining filter element separation unit connected with a water outlet of the hydrocyclone separator, and a W-shaped corrugated plate coalescer connected with the coarse graining filter element separation unit. The invention adopts the pure physical oil removal and impurity removal process, and no secondary solid waste is generated; the received dirty oil can be recycled or sold, so that the investment cost of equipment can be offset, and the environment-friendly and energy-saving effects are achieved.
Description
Technical Field
The invention belongs to the technical field of oil removal and impurity removal of oilfield reinjection water, and particularly relates to a device and a method for oil removal and impurity removal of oilfield reinjection water.
Background
With rapid development of economy and continuous progress of science and technology, most oil fields in China enter the later stage of exploitation and utilization, particularly development of low-permeability oil fields, a large amount of water needs to be injected to maintain good osmotic pressure; the oil field is exploited, the water content in the exploited crude oil is increased year by year, the produced water amount is increased, and the produced water is mainly treated by removing oil and suspended matters. In particular to the produced water of the three-component combination flooding, which is characterized in that: large viscosity, high oil displacement agent content, high alkalinity, high mineralization degree, fine particles, difficult oil-water sedimentation separation and the like.
The treatment capacity of the traditional treatment process equipment of 'secondary precipitation' + 'secondary filtration' is reduced, the sedimentation time is too long, the effluent quality is unqualified, and the index requirement of reinjection water can not be met; therefore, a new process and a new material are required to be applied, the oil removing equipment is improved, and the novel oil removing equipment with strong oil removing capability is developed to meet the production requirement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a device and a method for removing oil and impurities from oilfield reinjection water, which aim to solve the problem that the existing oilfield reinjection water treatment process is old, and the traditional methods such as sedimentation, air flotation, filtration and the like are used, so that the standard-reaching and lifting requirements cannot be met.
In order to achieve the purpose, the invention adopts the following technical scheme: the device for removing oil and impurities from oilfield reinjection water comprises a sewage settling tank, a horizontal oil-water separator connected with the sewage settling tank, a filter connected with the horizontal oil-water separator, a refined essential oil-water separator connected with the filter, and a precision filter connected with the refined essential oil-water separator;
the sewage settling tank comprises an inner tank and an outer tank, a cyclone separator is arranged in the inner tank, and the oilfield reinjection water is injected into the cyclone separator to be separated into water, oil and slurry;
the horizontal oil-water separator comprises a hydrocyclone separator, a coarse grained filter element separation element connected with a water outlet of the hydrocyclone separator, and a W-shaped corrugated plate coalescer connected with the coarse grained filter element separation element.
According to a further technical scheme, a liquid inlet pipe is arranged on the sewage settling tank and penetrates through the outer tank, and the inner tank is communicated with the cyclone separator.
According to the technical scheme, an oil discharge pipe communicated to the outer side of the outer tank is arranged at the upper end of the inner tank, a water guide pipe communicated to the inner portion of the outer tank is arranged in the middle of the inner tank, a sludge discharge pipe communicated to the outer side of the outer tank is arranged at the bottom of the inner tank, and a water discharge pipe communicated to the outer side of the outer tank is arranged on the outer tank.
According to the technical scheme of the invention, the hydrocyclone is communicated with a drain pipe, and the hydrocyclone, the coarse graining filter element separating element and the W-shaped corrugated plate coalescer are communicated through pipelines.
According to a further technical scheme, the filter comprises a primary filter and a secondary filter, and the primary filter and the secondary filter are used for removing suspended matters in water.
According to a further technical scheme, the refined essential oil water separator comprises a cyclone, a primary demulsification coalescence filter element separation element connected with a water outlet of the cyclone, and a secondary demulsification coalescence filter element separation element connected with the primary demulsification coalescence filter element.
The invention further adopts the technical scheme that the device also comprises a sump oil tank for storing the separated oil and a sludge tank for storing the separated sludge.
The invention also comprises a method for the oil removing and impurity removing device of the oilfield reinjection water,
(1) lifting the water discharged from the three-phase separation tank of the oilfield reinjection water station to a sewage settling tank by a pump, separating suspended matters, floating oil and large-particle dispersed oil in the water discharged from the three-phase separation tank by the sewage settling tank by using a rotational flow technology, and then passing through a horizontal oil-water separator;
(2) the horizontal oil-water separator collects and grows micro dispersed oil in water by using a cyclone, coarse graining and W-shaped corrugated plate collecting and separating technology, so that the micro dispersed oil is separated from the water and then passes through a filter;
(3) the filter intercepts suspended matters and solid particles in water, so that the suspended matters and the solid particles are separated from the water, and then the water passes through a fine essential oil water separator;
(4) a fine essential oil water separator breaks emulsion of emulsified oil in water by using the emulsion breaking and gathering function of the emulsion breaking and separating material to form dispersed oil, gathers and grows through a coalescence material, is separated from the water finally, and then passes through a filter;
(5) the filtration precision of the precision filter is 1 micron, and SS in the treated water is ensured to be less than 5mg/L, and the median particle size is less than 5 microns.
The invention provides a further technical proposal of the invention,
the specific steps of the step (1) comprise:
after various oily sewage from oil refining, petrifaction, devices and the like is converged to a sewage treatment station, the oily sewage is directly input into a liquid inlet pipe by a positive displacement sewage pump, enters a cyclone separator arranged in a middle tank through the liquid inlet pipe, is subjected to cyclone separation in the separator, generates a centrifugal force field by utilizing the density difference of oil and water, converges oil and light phase substances in the middle, then upwards enters the upper end of an inner tank, and enters a sump oil tank through an oil discharge pipe; the water and the solid-phase substances respectively enter the middle part and the lower part of the inner tank in a downward way, the separated water enters the space between the outer tank and the inner tank through the water guide pipe for storage and enters the horizontal oil-water separator through the water discharge pipe, and the solid-phase substances are discharged to the sludge tank through the sludge discharge pipe;
or, the specific steps of (2) include:
the method comprises the following steps that oily sewage is firstly input into a hydrocyclone separator of a horizontal oil-water separator through a sewage conveying pump, the oily sewage flows in the hydrocyclone separator through hydraulic force to generate low-speed rotation, centrifugal force fields generated due to different density differences of oil and water are different, and the oily sewage is pretreated through the centrifugal force; catching fine oil particles with the particle size of more than 15-20 microns in water through a coarse grained filter element separation unit, and separating the fine oil particles from the coarse grained filter element separation unit after the fine oil particles are gradually enlarged; after passing through the W-shaped corrugated plate coalescer, oily sewage passes through a tortuous flow channel in the W-shaped corrugated plate coalescer, so that the liquid achieves uniform water distribution while realizing laminar flow, oil droplets separated from a coarse graining filter element separation unit continue to collide and grow up to be separated from the water, finally the oil content of the discharged water is ensured to be stabilized below 50mg/l, and finally the discharged water enters a filter.
The invention provides a further technical proposal of the invention,
the specific steps of the step (4) comprise:
the treated water is delivered into a fine essential oil-water separator by a delivery pump, the liquid enters a cyclone under certain pressure and speed to generate medium-low speed rotation, different centrifugal force fields are generated by different density differences of oil and water, the oily sewage is treated by centrifugal force, light phase substances enter an oil storage tank on the upper part of equipment, impurity heavy phase substances sink, the treated water enters a primary demulsification coalescence filter element separation unit and a secondary demulsification coalescence filter element separation unit, and a filter element made of a porous demulsification membrane material woven by oleophylic hydrophobic/hydrophilic oleophobic combined fibers adopted by the primary demulsification coalescence filter element and the secondary demulsification coalescence filter element captures and breaks the balance state of fine oil particles, and the escaped fine oil particles are gathered on the surface of the oleophylic hydrophobic fibers, coalesced and grown so as to be separated from the water and then enter a precision filter.
The device and the method for removing oil and impurities from oilfield reinjection water have the advantages that:
1. the oil removal and impurity removal process is carried out in a pure physical mode, and secondary solid waste is not generated; the received dirty oil can be recycled or sold, so that the investment cost of equipment can be offset, and the environment-friendly and energy-saving effects are achieved.
2. According to different states of the dirty oil in the oily sewage, different separation technologies are adopted to carry out treatment step by step, and the reinjection water meeting the standard is obtained through primary treatment of the floating oil, the dispersed oil and the emulsified oil.
3. The device has the advantages of low running cost, low power consumption, no mechanical transmission device, no easily-damaged part and low maintenance cost of equipment; the filter element of the horizontal oil-water separator only needs on-line back flushing and does not need to be replaced; the filter element of the filter only needs to be backflushed regularly, and the service life is 3-5 years; the service cycle of the oil-water separation filter element of the refined essential oil-water separator is 12-24 months.
4. According to the actual requirements of the existing reinjection water of different oil fields, the existing old treatment process of the oil field reinjection water combination station is upgraded, adjusted and modified, and the new requirements of the oil content, the suspended matter content and the median particle size index of the existing reinjection water are met.
Drawings
FIG. 1 is a schematic view of a connection structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of a sewage settling tank according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the internal structure of the horizontal oil-water separator according to the embodiment of the present invention;
fig. 4 is a schematic view of the internal structure of a refined essential oil-water separator according to an embodiment of the present invention;
parts reference number description:
in the figure:
a sewage settling tank 1, an inner tank 11, an outer tank 12, a cyclone separator 13, a liquid inlet pipe 14, an oil discharge pipe 15, a water guide pipe 16, a sludge discharge pipe 17 and a water discharge pipe 18,
a horizontal oil-water separator 2, a hydrocyclone 21, a coarse graining filter element separation unit 22, a W-shaped corrugated plate coalescer 23, a primary filter 3,
the secondary filter (4) is provided with a secondary filter,
a refined essential oil water separator 5, a cyclone 51, a primary demulsification coalescence filter element separation unit 52, a secondary demulsification coalescence filter element separation unit 53,
the precision filter (6) is arranged on the upper surface of the shell,
the amount of the dirty oil tank 7 is,
and a sludge tank 8.
Detailed Description
The following further describes the embodiments with reference to the drawings.
Example 1:
as shown in the figures 1-4 of the drawings,
the device for removing oil and impurities from oilfield reinjection water comprises a sewage settling tank 1, a horizontal oil-water separator 2 connected with the sewage settling tank, a primary filter 3 and a secondary filter 4 connected with the horizontal oil-water separator 2, wherein the primary filter 3 and the secondary filter 4 are used for removing suspended matters in water. A refined essential oil water separator 5 connected with the secondary filter 4, and a precision filter 6 connected with the refined essential oil water separator 5; and the device also comprises a sump oil tank 7 for storing the separated oil and a sludge tank 8 for storing the separated sludge.
The sewage settling tank 1 is internally provided with a tank-in-tank and mainly used for removing floating oil and large-particle dispersed oil, and comprises an inner tank 11 and an outer tank 12, wherein a cyclone separator 13 is arranged in the inner tank 11, and the oilfield reinjection water is injected into the cyclone separator 13 and is separated into water, oil and slurry; a liquid inlet pipe 14 is arranged on the sewage settling tank 1, the liquid inlet pipe 14 penetrates through the outer tank 12, and the inner tank 11 is communicated with the cyclone separator 13. An oil discharge pipe 15 communicated to the outer side of the outer tank 12 is arranged at the upper end of the inner tank 11, a water guide pipe 16 communicated to the inner portion of the outer tank 12 is arranged at the middle of the inner tank 11, a sludge discharge pipe 17 communicated to the outer side of the outer tank 12 is arranged at the bottom of the inner tank 11, a water discharge pipe 18 communicated to the outer side of the outer tank 12 is arranged on the outer tank 12, and a collecting oil discharger communicated with the oil discharge pipe 15 is further arranged at the upper portion of the inner tank 11.
The sewage settling tank 1 integrates the functions of sewage regulation, homogenization and oil removal, thoroughly solves the difficult problem of oil collection on the surface of a homogenizing tank and the difficulty of sludge discharge at the bottom of the homogenizing tank, and can replace a regulating tank which occupies a large area in an oily wastewater primary treatment system, a homogenizing tank and an inclined plate oil separation tank with low oil removal efficiency. In particular, the environmental quality of the sewage treatment plant is improved, and the odor of the site of the sewage treatment plant is basically eliminated. Has better adaptability, high efficiency and stability. Under the condition that the imported oil content is more than 10000mg/L, the oil content in the oily sewage discharged after the pretreatment of the tank-in-tank is below 150mg/L (without emulsified dissolved oil), the oil removing capability is stable and efficient, and the oil-containing sewage has good automatic oil collecting, oil discharging and sludge discharging effects.
The main design parameters of the sewage settling tank are as follows: sewage inflow pressure: 0.1-0.3 MPa; inflow water flow rate: 1-2.5 m/s; the settling speed of sludge in the tank is as follows: 0.4-1.2 mm/s; the content of inlet water oil: 2000 mg/l; oil content of effluent:
<200 mg/l; working temperature: 60 ℃; oil discharge mode: manual/automatic; a sludge discharge mode: manual/automatic; a heat tracing mode: water vapor (0.4 MPa);
the horizontal oil-water separator 2 adopts the technical combination of rotational flow, coarse graining and W-shaped corrugated plates to remove dispersed oil larger than 20 microns, and is suitable for the comprehensive oily sewage oil removal treatment in the petrochemical industry, the oil removal treatment of oilfield oil extraction reinjection water, the crude oil dehydration oily sewage treatment, the crude oil desulfurization sewage treatment in the oil refining chemical industry, the acid water oil removal sewage treatment of a sulfur recovery device, the oily sewage treatment for cleaning a crude oil storage tank, the oily sewage treatment in ports and docks, and the like. Comprises a hydrocyclone 21, a coarse grained filter element separation unit 22 connected with a water outlet of the hydrocyclone 21, and a W-shaped corrugated plate coalescer 23 connected with the coarse grained filter element separation unit 22. The hydrocyclone 21 is communicated with the drain pipe 18, and the hydrocyclone 21, the coarse grained filter element separation unit 22 and the W-shaped corrugated plate coalescer 23 are communicated through pipelines. Still include the oil slick collector, the oil slick collector is automatic to be collected the oil and arrange to the oil collection in the oil collection package, and when the oil reservoir in the oil collection package reached certain liquid level, the oil level sensor who is set up in the oil collection package sent the signal to the switch board, opens the motorised valve automatically (also possesses the manual function of opening of manual work simultaneously) and arranges oil to in the sump oil jar.
The equipment is also provided with a pressure gauge, a thermometer and a safety valve overpressure protection device. In order to adapt to the use requirements of different working conditions in winter in different areas, a steam heating system device for heat tracing and maintenance is also arranged in the equipment, so that the equipment can normally operate in winter. The equipment is matched with a PLC automatic control box, has all automatic control functions of an oil-water separator, a remote DCS centralized control operation function and a light display television picture monitoring function, can be converted into manual operation control at any time, and is reliable in performance.
The main parameters of the horizontal oil-water separator are as follows: the density of the treatment medium is 1000kg/m 3 Density of sump oil 750- 3 The oil content of the inlet water before treatment is less than 200mg/l, the oil content of the outlet water after treatment is less than or equal to 50mg/l, the working temperature is 40 ℃, and the working pressure is less than or equal to 0.3Mpa (G).
The WYS-XX horizontal oil-water separator is a single-cylinder four-cavity horizontal oily sewage treatment sealing device, the pipeline and the matched pipeline on the device are all made of steel pipes for chemical industry, and the pipeline valves are all made of steel. In addition, for reliable operation of the equipment, the important parts inside the equipment are made of stainless steel materials, and necessary anticorrosion measures are taken inside and outside the equipment, so that the use requirements of petrochemical industry industrial environments can be completely met.
The refined essential oil water separator 5 breaks the balance of oil in water by using the characteristics of an emulsion membrane, and separates the emulsion oil in the sewage by using the gathering function of oleophylic hydrophobic fibers, thereby achieving the function of removing the emulsion oil. Comprises a cyclone 51, a first-stage demulsification coalescence filter element separation unit 52 connected with a water outlet of the cyclone 51, and a second-stage demulsification coalescence filter element separation unit 53 connected with the first-stage demulsification coalescence filter element 52. The floating oil collecting device also comprises a floating oil collector, a PLC control box, a valve and an instrument.
The tank body of the refined essential oil water separator 5 is made of carbon steel material and is internally coated with anticorrosive paint. The cyclone 51 is made of stainless steel material by special processing, and is used for separating solid suspended matters such as large-particle dispersed oil and various mechanical impurities in oily sewage, and plays a role in pretreatment of the oily sewage. Because the hydraulic cyclone principle is utilized, the separation efficiency is dozens of times of that of inclined plate advection sedimentation. The first-stage demulsification coalescence filter element separation unit 52 is used for performing pre-demulsification aggregation separation on fine oil particles of 2-10 microns, and the second-stage demulsification coalescence filter element separation unit 53 is used for performing demulsification, aggregation separation on fine oil particles of 0.1-2 microns. The first and second filter element materials are used for the demulsification and coalescence combined membrane for catching 0.1-10 micron fine oil droplets, the precision is different, when the treated water passes through the membrane, the treated water is firstly demulsified and then coalesced, so that the treated water is gradually polymerized into large oil droplets, and the large oil droplets are separated from the oil water and enter a floating oil collector at the top of the equipment.
The treated water of the refined essential oil-water separator 5 can be conveyed by gravity flow (the water level is higher than 0.08MPa) or a sewage pump. An explosion-proof motor and an explosion-proof automatic control facility can be arranged according to the used field conditions so as to meet the use requirements of special environments. And a pressure display instrument and an overpressure automatic protection device are also arranged. The electric control box on the equipment is integrally provided with the automatic oil drain valve of the equipment according to the needs of users. The matched electric control box has the function of automatic control and display.
The cyclone 51 has a main function of pre-treating the treated water to separate large-particle dispersed oil. The first-stage demulsification coalescence filter element is a filter element made of a porous demulsification membrane material woven by oleophylic hydrophobic/hydrophilic oleophobic combination fibers, the filter element captures and breaks the balance state of fine oil particles (2-10 microns), and the escaped fine oil bead particles are gathered on the surface of the oleophylic hydrophobic fibers and coalesced to grow, so that the oil particles are separated from water. The material property of the secondary demulsification coalescence filter element is the same as that of the primary filter element, but the secondary demulsification coalescence filter element is more precise. The emulsified oil (0.1-2 microns) in the treated water is unbalanced and demulsified, oil molecules are separated from water molecule packages, the oil molecules are gathered together, and then gathering is accelerated to become large oil beads through the gathering function of gathering materials, so that the oil beads are separated from the water. The two groups of first-stage and second-stage filter elements are combined to use micro oil droplets of 0.1-10 microns in demulsification coalescence treatment water, so that the micro oil droplets are gradually enlarged and separated from the filter element, thereby achieving the purpose of oil-water separation, ensuring the oil content index in discharged water and meeting the water inlet index requirement used in the subsequent treatment process.
The separated light oil is collected and polymerized in an oil collecting chamber at the top of the equipment, when an oil layer reaches a certain oil layer thickness in the equipment, the oil is automatically collected and discharged into an oil collecting chamber by a floating oil collector, when the oil layer in the chamber reaches a certain liquid level, a signal is transmitted to a PLC control cabinet by an advanced radio frequency admittance liquid level sensor matched with the equipment, and an electric valve is automatically opened (or manually opened) to discharge the oil to a sump oil collecting cabinet (sump oil tank) for comprehensive utilization; in order to ensure that liquid flow can be uniformly distributed and laminar flow in the equipment and no liquid flow dead zone is formed, a set of complete liquid flow laminar flow distribution system is also arranged in the equipment so as to ensure that the oily sewage is in a laminar flow state in the equipment all the time. Safety protection valves and instruments such as overpressure automatic protection, temperature display, liquid level automatic display, back washing and the like are also arranged in the equipment, so that the equipment can be ensured to run reliably and stably for a long time, and automatic unmanned operation is realized.
The primary filter and the secondary filter separate suspended particles in sewage by using the filter element, and the surface of the filter element is subjected to special smoothing treatment, so that the filter element is not easy to adhere to the surface of the filter element, and the backwashing frequency is reduced. Mainly comprises a shell, a filter element supporting device, a filter element, a backwashing device, functional pipe orifices and the like.
The waste water containing solid particles enters the filter through the liquid inlet of the filter, enters and exits the filter element in an external-in and internal-out mode, the solid particles contained in the medium are intercepted on the outer surface of the filter element, the filtered clear liquid reaches the equipment liquid purification area from the inside of the filter element, the equipment liquid purification area is communicated with the liquid purification outlet, and the filtered clear liquid enters the next procedure through the equipment outlet. The filter core subregion sets up in the equipment, and every region corresponds a post-filtration clean liquid export, and all clean liquid outlet valve are open state during filtering. When the equipment is provided with the piping, all the clean liquid outlet pipes can be collected into a clean liquid outlet main pipe. Along with the filtering, the filter cake layer trapped outside the filter element is thickened continuously, so that the pressure difference between the inlet and the outlet of the equipment is increased gradually, and when the pressure difference is increased to a set value (100 KPa is recommended to be set), the equipment can be stopped from running, and the filter element is subjected to online backwashing.
The filter element used by the filter is made of corrosion-resistant, high-temperature-resistant and ultralow-temperature-resistant alloy materials which are subjected to smoothing treatment by a special process, and can completely meet the requirements of long-term use effect and backwashing. The porosity is as high as 65% -95%, and the filter is particularly suitable for filtering fluid with large flow, low resistance, high viscosity and high dust content. The first layer of filter material on the surface of the filter element is subjected to special smoothing treatment, the friction coefficient after treatment is very low (equivalent to about 0.4 of roughness), and the treated particle impurities cannot be easily hung on the outer surface of the filter element, so the filter element has extremely good back flushing performance and is extremely easy to blow away by back flushing gas, and the service efficiency of the filter element after first purging and cleaning can reach more than 95%.
The surfaces of the first-stage filter 3 and the second-stage filter 4 are subjected to smooth treatment, so that solid particles are not easy to attach and are easy to fall off after filter cakes are formed; large flow capacity and small pressure loss; high temperature and high pressure resistance: the contact points of the metal wires of the filter element are bonded together by the mutual permeation of metal atoms under the high-temperature condition, and have high strength and toughness. And the micropores can not deform under high pressure, so that the stability of the filtration precision in the use process is ensured. The filter element is folded in a barrel shape, is fully fusion-penetration-welded, has high strength and can bear the pressure difference of 10bar to the maximum extent; the filter element has high porosity (the porosity can reach more than 85 percent) and excellent air permeability; high dirt holding capacity: the unique three-dimensional multi-layer depth filtering structure has quite high nano capacity for pollutants, which is 3-5 times of that of sintered powder materials. Good abrasion resistance and impact resistance. The cleaning regeneration efficiency is high, and the cleaning time is short. The filter element can be regenerated and recycled, and can be used for 3-5 years under normal working conditions.
The precision filter utilizes the high accuracy filter core to filter the oil field reinjection water through deoiling processing, and suspended solid such as most coke breeze in the waste water is from the aquatic separation, guarantees the index requirement of median particle size in the reinjection water.
The oil field reinjection water treated by the whole device has the petroleum content index of less than 10mg/L, SS of less than 5mg/L and the median particle size of less than 5 mu m.
Example 2:
the invention also comprises a method for the oil removing and impurity removing device of the oilfield reinjection water,
(1) after various oily sewage from oil refining, petrifaction, devices and the like is collected to a sewage treatment station, the oily sewage is directly input into a liquid inlet pipe by a positive displacement sewage pump, enters a cyclone separator arranged in a middle tank through the liquid inlet pipe, is subjected to cyclone separation in the separator, generates a centrifugal force field by utilizing the density difference of oil and water, collects oil and light phase substances in the middle, then upwards enters an oil collecting and discharging device at the upper end of an inner tank, and enters a sump oil tank through an oil discharging pipe; the water and the solid-phase substances respectively enter the middle part and the lower part of the inner tank in a downward way, the separated water enters the space between the outer tank and the inner tank through the water guide pipe for storage and enters the horizontal oil-water separator through the water discharge pipe, and the solid-phase substances are discharged to the sludge tank through the sludge discharge pipe;
(2) the method comprises the following steps that oily sewage is firstly input into a hydrocyclone separator of a horizontal oil-water separator through a sewage conveying pump, the oily sewage flows in the hydrocyclone separator through hydraulic force to generate low-speed rotation, centrifugal force fields generated due to different density differences of oil and water are different, and the oily sewage is pretreated through the centrifugal force; catching fine oil particles with the particle size of more than 15-20 microns in water through a coarse grained filter element separation unit, and separating the fine oil particles from the coarse grained filter element separation unit after the fine oil particles are gradually enlarged; after passing through the W-shaped corrugated plate coalescer, oily sewage passes through a tortuous flow channel in the W-shaped corrugated plate coalescer, so that liquid achieves uniform water distribution while realizing laminar flow, oil drops separated from the coarse grained filter element separation unit continue to collide and grow up to be separated from water, finally the oil content of the discharged water is ensured to be stabilized below 50mg/l, and finally the discharged water enters a filter.
(3) The filter intercepts suspended matters and solid particles in water, so that the suspended matters and the solid particles are separated from the water, and then the water passes through a fine essential oil water separator;
(4) the treated water is delivered into a fine essential oil-water separator by a delivery pump, the liquid enters a cyclone under certain pressure and speed to generate medium-low speed rotation, different centrifugal force fields are generated by different density differences of oil and water, the oily sewage is treated by centrifugal force, light phase substances enter an oil storage tank on the upper part of equipment, impurity heavy phase substances sink, the treated water enters a primary demulsification coalescence filter element separation unit and a secondary demulsification coalescence filter element separation unit, and a filter element made of a porous demulsification membrane material woven by oleophylic hydrophobic/hydrophilic oleophobic combined fibers adopted by the primary demulsification coalescence filter element and the secondary demulsification coalescence filter element captures and breaks the balance state of fine oil particles, and the escaped fine oil particles are gathered on the surface of the oleophylic hydrophobic fibers, coalesced and grown so as to be separated from the water and then enter a precision filter.
(5) The filtering precision of the precision filter is 1 micron, and SS in the treated water is ensured to be less than 5mg/L, and the median particle size is less than 5 microns.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. The utility model provides a device that is used for oil field reinjection water deoiling, edulcoration, characterized by: the device comprises a sewage settling tank, a horizontal oil-water separator connected with the sewage settling tank, a filter connected with the horizontal oil-water separator, a refined essential oil-water separator connected with the filter, and a precision filter connected with the refined essential oil-water separator;
the sewage settling tank comprises an inner tank and an outer tank, a cyclone separator is arranged in the inner tank, and the oilfield reinjection water is injected into the cyclone separator to be separated into water, oil and slurry;
the horizontal oil-water separator comprises a hydrocyclone separator, a coarse graining filter element separation unit connected with a water outlet of the hydrocyclone separator, and a W-shaped corrugated plate coalescer connected with the coarse graining filter element separation unit.
2. The device for removing oil and impurities in oilfield reinjection water according to claim 1, characterized in that: and a liquid inlet pipe is arranged on the sewage settling tank, the liquid inlet pipe penetrates through the outer tank, and the inner tank is communicated with the cyclone separator.
3. The device for removing oil and impurities in oilfield reinjection water according to claim 2, characterized in that: the upper end of the inner tank is provided with an oil discharge pipe communicated to the outer side of the outer tank, the middle of the inner tank is provided with a water guide pipe communicated to the inner side of the outer tank, the bottom of the inner tank is provided with a sludge discharge pipe communicated to the outer side of the outer tank, and the outer tank is provided with a water discharge pipe communicated to the outer side of the outer tank.
4. The device for removing oil and impurities in oilfield reinjection water according to claim 3, characterized in that: the hydrocyclone separator is communicated with a drain pipe, and the hydrocyclone separator, the coarse graining filter element separation unit and the W-shaped corrugated plate coalescer are communicated through pipelines.
5. The device for removing oil and impurities in oilfield reinjection water according to claim 1, characterized in that: the filter comprises a primary filter and a secondary filter, and the primary filter and the secondary filter are used for removing suspended matters in water.
6. The device for removing oil and impurities in oilfield reinjection water according to claim 1, characterized in that: the refined essential oil water separator comprises a cyclone, a primary demulsification coalescence filter element separation unit connected with a water outlet of the cyclone, and a secondary demulsification coalescence filter element separation unit connected with a primary demulsification coalescence filter element.
7. The device for removing oil and impurities in oilfield reinjection water according to claim 1, characterized in that: also comprises a dirty oil tank for storing the separated oil and a sludge pool for storing the separated sludge.
8. The method for removing oil and impurities from oilfield reinjection water as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
(1) lifting the water discharged from the three-phase separation tank of the oilfield reinjection water station to a sewage settling tank by a pump, separating suspended matters, floating oil and large-particle dispersed oil in the water discharged from the three-phase separation tank by the sewage settling tank by using a rotational flow technology, and then passing through a horizontal oil-water separator;
(2) the horizontal oil-water separator collects and grows micro dispersed oil in water by using a cyclone, coarse graining and W-shaped corrugated plate collecting and separating technology, so that the micro dispersed oil is separated from the water and then passes through a filter;
(3) the filter intercepts suspended matters and solid particles in water, so that the suspended matters and the solid particles are separated from the water, and then the water passes through a fine essential oil water separator;
(4) a fine essential oil water separator breaks emulsion of emulsified oil in water by using the emulsion breaking and gathering function of the emulsion breaking and separating material to form dispersed oil, gathers and grows through a coalescence material, is separated from the water finally, and then passes through a precision filter;
(5) the precision filter ensures that SS in the treated water is less than 5mg/L and the median particle size is less than 5 microns.
9. The oil field reinjection water oil and impurity removal method according to claim 8, characterized in that:
the specific steps of the step (1) comprise:
after various oily sewage from oil refining, petrifaction, devices and the like is converged to a sewage treatment station, the oily sewage is directly input into a liquid inlet pipe by a positive displacement sewage pump, enters a cyclone separator arranged in a middle tank through the liquid inlet pipe, is subjected to cyclone separation in the separator, generates a centrifugal force field by utilizing the density difference of oil and water, converges oil and light phase substances in the middle, then upwards enters the upper end of an inner tank, and enters a sump oil tank through an oil discharge pipe; the water and the solid-phase substances respectively enter the middle part and the lower part of the inner tank in a downward way, the separated water enters the space between the outer tank and the inner tank through the water guide pipe for storage and enters the horizontal oil-water separator through the water discharge pipe, and the solid-phase substances are discharged to the sludge tank through the sludge discharge pipe;
or, the specific steps of (2) include:
the method comprises the following steps that oily sewage is firstly input into a hydrocyclone separator of a horizontal oil-water separator through a sewage conveying pump, the oily sewage flows in the hydrocyclone separator through hydraulic force to generate low-speed rotation, centrifugal force fields generated due to different density differences of oil and water are different, and the oily sewage is pretreated through the centrifugal force; catching fine oil particles with the particle size of more than 15-20 micrometers in water through a coarse grained filter element separation unit, and separating the fine oil particles from the coarse grained filter element separation unit after the fine oil particles are gradually enlarged; after passing through the W-shaped corrugated plate coalescer, oily sewage passes through a tortuous flow channel in the W-shaped corrugated plate coalescer, so that liquid achieves uniform water distribution while realizing laminar flow, oil drops separated from the coarse grained filter element separation unit continue to collide and grow up to be separated from water, finally the oil content of the discharged water is ensured to be stabilized below 50mg/l, and finally the discharged water enters a filter.
10. The oil field reinjection water oil and impurity removal method according to claim 8, characterized in that:
the specific steps of the step (4) comprise:
the treated water is delivered into a fine essential oil-water separator by a delivery pump, the liquid enters a cyclone under certain pressure and speed to generate medium-low speed rotation, different centrifugal force fields are generated by different density differences of oil and water, the oily sewage is treated by centrifugal force, light phase substances enter an oil storage tank on the upper part of equipment, impurity heavy phase substances sink, the treated water enters a primary demulsification coalescence filter element separation unit and a secondary demulsification coalescence filter element separation unit, and a filter element made of a porous demulsification membrane material woven by oleophylic hydrophobic/hydrophilic oleophobic combined fibers adopted by the primary demulsification coalescence filter element and the secondary demulsification coalescence filter element captures and breaks the balance state of fine oil particles, and the escaped fine oil particles are gathered on the surface of the oleophylic hydrophobic fibers, coalesced and grown so as to be separated from the water and then enter a precision filter.
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