CN109019913B - Oil field compact separation method for removing oil and suspended matters - Google Patents
Oil field compact separation method for removing oil and suspended matters Download PDFInfo
- Publication number
- CN109019913B CN109019913B CN201810898230.2A CN201810898230A CN109019913B CN 109019913 B CN109019913 B CN 109019913B CN 201810898230 A CN201810898230 A CN 201810898230A CN 109019913 B CN109019913 B CN 109019913B
- Authority
- CN
- China
- Prior art keywords
- oil
- light phase
- enters
- axial
- primary dehydrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Cyclones (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Sludge (AREA)
Abstract
A compact separation method for removing oil and suspended matter in oil field features that its apparatus is composed of primary dewatering unit, axial hydraulic cyclone, and compact cyclone air floating unit, and features that the volume of equipment is greatly reduced. Wherein, the primary dehydrator BC replaces a weight settling tank, the axial hydrocyclone AHC replaces HC, and the compact cyclone air flotation unit CFU replaces conventional air flotation; the retention time of the weight settling tank is 20-30min, the conventional air floatation is 15-25min, the retention time of BC is less than 10s, the retention time of CFU of the compact cyclone air floatation unit is less than 3min, and the total retention time is reduced to be less than 3.5min from more than 40 min; the flow field generated by the axial hydrocyclone AHC is stable, the efficiency is higher than HC, and the pressure drop is lower than HC; therefore, the whole equipment has small volume, low investment cost and simple and convenient maintenance, and is suitable for occasions with strict space requirements.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an oil field on-site compact separation method for removing oil and suspended matters.
Background
The oil field produced liquid contains oil, gas, water and sand which are multiphase (the oil field produced liquid is mainly a mixture of oil and water), and the multiphase is separated through a plurality of treatment processes (mainly carried out in a united station) to obtain natural gas or purer petroleum, or is used in the industrial and civil fields, or is subjected to the next treatment. The produced liquid has different water content due to different compositions of substances at different areas and different wellheads. Generally, however, as oil wells continue to be produced, water cut increases and oil production decreases. The water content of most oil well produced liquid of many oil fields is more than 90-95%.
The oil field produced liquid is separated in the united station to extract oil in the mixture, and the residual water is required to be reinjected or discharged to reach the corresponding environmental protection standard of oil-containing suspended matters in the oil field, otherwise, the reinjection or the discharge is not allowed. The high water content produced liquid in the oil field is directly transported to a united station through a pipeline or an oil tank truck for treatment. In actual conditions, oil wells are distributed in various areas of an oil field, and transportation costs a lot of resources, so that a lot of resource waste and energy waste are caused. Meanwhile, because the water content is high, a new well must be developed in order to improve the oil yield, so that the current oil conveying pipeline or transport vehicle cannot meet the requirements, and the new well must be planned again, thereby limiting the exploitation and the yield increase of the oil field.
At present, produced liquid needs to be transported to a united station, and after oil is extracted, the oil content and suspended matter content in water are lower than the specified standards of an oil field. In the combined station, the processes from the produced liquid to the later stage discharge or reinjection mainly comprise a weight settling tank, HC and conventional air floatation and the like, wherein the residence time of the weight settling tank is 20-30min, the residence time of the HC is about 10s, the residence time of the conventional air floatation is 15-25min, and the volume of the equipment is relatively large. Occupying space and being troublesome to operate and maintain. In some oil fields, due to the increase of water content, the later-stage wellhead produced liquid contains more than 90% of water, and the water in the high-water-content produced liquid cannot reach the standard and cannot be treated on site, and is transported to a united station at the center of the oil field from a remote oil production area through a pipeline or is transported to the united station by an oil tank truck for treatment, so that a large amount of resource waste and energy waste are caused, and the yield is limited.
Disclosure of Invention
Based on the problems in the prior art, the invention provides an oil field compact separation method for removing oil and suspended matters.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a compact separation method for oil field site for removing oil and suspended matters adopts a device comprising a primary dehydrator, an axial hydrocyclone and a compact cyclone air flotation unit, and comprises the following concrete steps:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator from an inlet at the bottom of the primary dehydrator, then enters the impeller shell through an inlet hole at the upper part of the impeller shell through a gap between the impeller shell and the outer cylinder, and then flows through a guide vane arranged in the impeller shell to enable oil-water mixed fluid to generate rotational flow, the oil-water mixed fluid passes through a large cone section between the impeller shell and an impeller head, is gathered towards the center in a light phase under certain centripetal acceleration, passes through a small cone section connected below the large cone section to enable unaggregated fine oil drops to be gathered, then the gathered light phase enters a light phase overflow port at the lower part of the impeller head, finally is discharged from a light phase outlet arranged at the upper part of the impeller head, enters a light phase output pipe of the primary dehydrator, passes through the primary dehydrator and a light phase outlet of an axial hydrocyclone to enter a post-treatment link, and on the other hand, the heavy phase is discharged from a heavy phase outlet at the bottom of the primary dehydrator along a tail cone section; the separation effect is achieved;
step two: the mixed fluid discharged from the heavy phase outlet at the bottom of the primary dehydrator passes through the heavy phase output pipe of the primary dehydrator and enters the axial hydrocyclone from the inlet of the axial hydrocyclone, and the light phase of the mixed fluid enters the light phase output pipe of the axial hydrocyclone and enters the post-treatment link through the light phase outlets of the primary dehydrator and the axial hydrocyclone;
step three: the heavy phase discharged by the axial hydrocyclone passes through a heavy phase output pipe of the axial hydrocyclone and micro bubbles generated by the dissolved air pump, enters a bottom cavity of the compact cyclone air floating unit through an inlet of the compact cyclone air floating unit, stays in the bottom cavity for a short time, and is released and further mixed and adhered with oil drops; through the S-shaped inlet device arranged above the bottom cavity and at the lower end of the inner cavity, liquid generates stable rotational flow and enters the inner cavity; the bubbles and the oil drops are subjected to more collision and adhesion in the cavity of the inner cavity, the volume of the adhered body is increased, the separation probability is improved, the mixed fluid is separated under the action of the rotational flow, the light phase is close to the middle, and the oil content in the external heavy phase is reduced; meanwhile, when the mixed fluid passes through the annular coalescence plate arranged at the top of the inner cavity, the inner cavity touches the wall surface to form a larger mixture, which is beneficial to the separation of oil cores and water; oil drops and air bubble adherends are collected and discharged from the top of the outer cylinder cavity, a small amount of adherends are further coalesced in the outer cylinder cavity, so that the adherends and the water float to the top, and the water enters a light phase output pipe of the compact cyclone air flotation unit from a top overflow port at the top end of the outer cylinder cavity and enters a post-treatment link through a primary dehydrator and a light phase outlet of an axial hydrocyclone; the clean water is discharged from a water outlet at the bottom of the compact cyclone air flotation unit, passes through a light phase output pipe of the compact cyclone air flotation unit, is treated from the water outlet of the compact cyclone air flotation unit and then is discharged.
Furthermore, the structure of the axial hydrocyclone is basically the same as that of the primary dehydrator except for the guide vanes, the guide vanes of the primary dehydrator are relatively narrow and relatively more in number, the guide vanes of the axial hydrocyclone are in the shape of an axisymmetric wide fan, the area of the wide fan-shaped guide vanes is about 1/2 of the fluid water passing section area, and the guide vanes are close to the wall surface of the fluid and are in a streamline structure.
In the oil field site compact separation method BC (dehydrator) + AHC + CFU for removing oil and suspended matters, the volume of equipment can be greatly reduced mainly aiming at the occasions with strict requirements on oil and suspended matters in sewage. Wherein BC replaces a weight settling tank, AHC replaces HC, and CFU replaces conventional air flotation; the retention time of the weight settling tank is 20-30min, the conventional air floatation is 15-25min, the retention time of BC is less than 10s, the retention time of CFU is less than 3min, and the total retention time is reduced to be less than 3.5min from more than 40 min; the flow field generated by AHC is stable, the efficiency is higher than HC, and the pressure drop is lower than HC; therefore, the whole equipment has small volume, low investment cost and simple and convenient maintenance, and is suitable for occasions with strict space requirements.
Wherein BC is bulk cyclic ketone or dewarter, which is a primary dehydrator; AHC is axialhydroclone, axial hydrocyclone; the CFU is Compact flow atomization Uint, Compact cyclone flotation unit.
The invention also comprises another embodiment of the oil field site compact separation method for removing oil and suspended matters, the adopted device comprises a primary dehydrator and two axial hydrocyclones, and the specific steps are as follows:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator from an inlet at the bottom of the primary dehydrator, then enters the impeller shell through an inlet hole at the upper part of the impeller shell through a gap between the impeller shell and the outer cylinder, and then flows through a guide vane arranged in the impeller shell to enable oil-water mixed fluid to generate rotational flow, the oil-water mixed fluid passes through a large cone section between the impeller shell and an impeller head, is gathered towards the center in a light phase under certain centripetal acceleration, passes through a small cone section connected below the large cone section to enable unaggregated fine oil drops to be gathered, then the gathered light phase enters a light phase overflow port at the lower part of the impeller head, finally is discharged from a light phase outlet arranged at the upper part of the impeller head, enters a light phase output pipe of the primary dehydrator, passes through the primary dehydrator and a light phase outlet of an axial hydrocyclone to enter a post-treatment link, and on the other hand, the heavy phase is discharged from a heavy phase outlet at the bottom of the primary dehydrator along a tail cone section; the separation effect is achieved;
step two: the mixed fluid discharged from the heavy phase outlet at the bottom of the primary dehydrator passes through the heavy phase output pipe of the primary dehydrator and enters an axial hydrocyclone from the inlet of the axial hydrocyclone, and the light phase of the mixed fluid enters the light phase output pipe of the axial hydrocyclone and enters a post-treatment link through the light phase outlets of the primary dehydrator and the axial hydrocyclone;
step three: and the heavy phase of the mixed fluid enters the other axial hydrocyclone from the heavy phase output pipe of the axial hydrocyclone for further separation, the light phase is discharged from the light phase outlet of the other axial hydrocyclone, and the heavy phase is discharged after being treated from the outlet of the other axial hydrocyclone.
Furthermore, the structure of the axial hydrocyclone is basically the same as that of the primary dehydrator except for the guide vanes, the guide vanes of the primary dehydrator are relatively narrow and relatively more in number, the guide vanes of the axial hydrocyclone are in the shape of an axisymmetric wide fan, the area of the wide fan-shaped guide vanes is about 1/2 of the fluid water passing section area, and the guide vanes are close to the wall surface of the fluid and are in a streamline structure.
In some oil fields, due to the increase of water content, the later-stage wellhead produced liquid contains more than 90% of water, and the water in the high-water-content produced liquid cannot reach the standard and cannot be treated on site, and is transported to a united station at the center of the oil field from a remote oil production area through a pipeline or is transported to the united station by an oil tank truck for treatment, so that a large amount of resource waste and energy waste are caused, and the yield is limited. To this kind of condition, this patent is applicable to the on-the-spot reinjection occasion that can reach standard, with a large amount of water field treatment, only carries a small amount of oil water mixture to the joint station and handles, the cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart of an apparatus according to example 1 of the present invention;
FIG. 2 is a schematic view of the primary dehydrator BC of example 1 of the present invention;
FIG. 3 is a schematic structural view of an axial hydrocyclone AHC in accordance with embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of a compact cyclone flotation unit CFU according to embodiment 1 of the present invention;
fig. 5 is a schematic flow chart of an apparatus according to embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Example 1:
as shown in fig. 1-4, the oil field compact separation method for removing oil and suspended matters of the present invention comprises a primary dehydrator BC + axial hydrocyclone AHC + compact cyclone flotation unit CFU, and comprises the following specific steps:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator BC 2 from an inlet 1 at the bottom of the primary dehydrator BC 2, then enters the impeller shell 2-1 through an inlet hole 2-2 at the upper part of the impeller shell 2-1 through a gap between the impeller shell 2-1 and an outer cylinder, and is enabled to generate rotational flow through a guide vane 2-3 arranged in the impeller shell 2-1, the oil-water mixture passes through a gap (large cone section) 2-4 between the impeller shell 2-1 and an impeller head 2-10, the large cone section 2-4 is a curved flow channel obtained through fluid calculation, the curved flow channel realizes complete streamline, pulsation disorder is reduced, flow is optimized, and oil drops are favorably coalesced to prevent secondary crushing; the design can make the settling velocity larger, the residence time longer and the coalescence effect better, thereby achieving higher separation efficiency. Under certain centripetal acceleration, light phases (oil and suspended matters) are gathered towards the center, then pass through a small conical section 2-5 connected below a gap (a large conical section) 2-4 to enable unaggregated fine oil drops to be gathered, then the gathered light phases enter a light phase overflow port 2-9 at the lower part of an impeller head 2-10, finally are discharged from a light phase outlet 2-8 arranged at the upper part of the impeller head 2-10 to enter a BC light phase output pipe 3 and enter a post-treatment link through a BC and AHC light phase outlet 4, and on the other hand, heavy phases (water) are discharged from a heavy phase outlet 2-7 at the bottom of a primary dehydrator along a tail conical section 2-6; the separation effect is achieved;
step two: mixed fluid discharged from a heavy phase outlet 2-7 enters an axial hydrocyclone AHC 7 from an axial hydrocyclone AHC inlet 6 through a BC heavy phase output pipe 5, the structure of the axial hydrocyclone AHC 7 is different from that of a primary dehydrator BC 2, except that guide vanes are basically the same as the guide vanes, the guide vanes of the primary dehydrator BC 2 are narrow and relatively large in number and are suitable for fluid with high oil content, the guide vanes of the axial hydrocyclone AHC 7 are in an axisymmetric wide fan shape, the area of the wide fan-shaped guide vanes is about 1/2 of the cross-sectional area of the fluid, and the guide vanes are in a streamline design close to the wall surface of the fluid, so that a cyclone flow field is stronger, the distribution is more symmetrical and stable, the mixed fluid is suitable for the fluid with low oil content, and a light phase of the mixed fluid enters an AHC light phase output pipe 9 and enters a post-treatment link through BC and AH;
step three: the heavy phase discharged from the AHC passes through an AHC heavy phase output pipe 10 and a dissolved air pump 13 to generate micro-bubbles, the micro-bubbles enter a bottom cavity 11-2 of a compact rotational flow air floating unit CFU 11 through an inlet 11-1 of the compact rotational flow air floating unit, the micro-bubbles temporarily stay in the bottom cavity 11-2, and the bubbles are released and further mixed and adhered with oil drops; liquid generates stable rotational flow through an S-shaped inlet device 11-3 arranged above the bottom cavity 11-2 and at the lower end of the inner cavity 11-4 and enters the inner cavity 11-4; the bubbles and oil drops are collided and bonded more in the inner cavity 11-4, the volume of the adherend is increased, the separation probability is improved, the mixed fluid is separated under the action of the rotational flow, the light phase is close to the middle, and the oil content in the external heavy phase is reduced; meanwhile, when the mixed fluid passes through the annular coalescence plate 11-6 arranged at the top of the inner cavity 11-4, the inner cavity touches the wall surface to form a larger mixture, which is beneficial to the separation of oil cores and water; oil drops and air bubble adherends are collected and discharged from the top of the outer cylinder cavity 11-5, a small amount of adherends are further coalesced in the outer cylinder cavity 11-5, so that the adherends and water float to the top, and enter a CFU light phase output pipe 15 from a top overflow port 11-7 at the top end of the outer cylinder cavity 11-5 and enter a post-treatment link through a BC and AHC light phase outlet 4; the clean water is discharged from a bottom water outlet 11-8 of the compact cyclone air flotation unit, passes through a CFU light phase output pipe 16, is treated at a CFU water outlet 17 and then is discharged.
The primary dehydrator BC is as shown in the figure, the single stage mainly utilizes the centrifugal separation principle, liquid passes through an impeller to form rotational flow, centrifugal acceleration a (about 50 times of gravity acceleration g) is generated, oil drops and water in produced liquid are separated under the action of the centrifugal acceleration a, larger settling velocity is generated due to larger acceleration, the settling time is about 1% of gravity separation, the retention time is greatly reduced, and the single stage and the whole are extremely compact. AHC structure as shown, centrifugal acceleration a (about 100 times gravity g); the structure of the CFU is shown in the figure, the dissolved air pump generates micro bubbles to be adhered with oil drops in the incoming liquid to form an easily separated adherend, and the adherend is separated in the CFU; on the other hand, when liquid passes through BC and AHC, a large amount of suspended solids are carried by oil drops and are discharged from an oil outlet, and a small amount of residual suspended solids are adhered to micro-bubbles in a CFU (circulating fluid Unit), so that the particle size is increased, the density is reduced, the residual suspended solids are discharged from an overflow port of the CFU, and the process requirement for removing the suspended solids is ensured.
According to the scheme, the BC retention time is less than 10s, the AHC retention time is less than 10s, the CFU retention time is 3min, the total retention time of BC + AHC + CFU is less than 3.5min, the produced liquid contains oil less than 30%, after separation according to the scheme, the oil content in water at a three-stage outlet is less than 50ppm, and the suspended matter content is less than 50 ppm. Because the residence time of the scheme is extremely short, the volume is very small, and the scheme is suitable for occasions with smaller space occupation requirements.
Example 2:
as shown in fig. 5, the oil field compact separation method for removing oil and suspended matters of the present invention comprises a primary dehydrator BC and two axial hydrocyclones AHC, and comprises the following specific steps:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator BC 2 from an inlet 1 at the bottom of the primary dehydrator BC 2, then enters the impeller shell 2-1 through an inlet hole 2-2 at the upper part of the impeller shell 2-1 through a gap between the impeller shell 2-1 and an outer cylinder, and is enabled to generate rotational flow through a guide vane 2-3 arranged in the impeller shell 2-1, the oil-water mixture passes through a gap (large cone section) 2-4 between the impeller shell 2-1 and an impeller head 2-10, the large cone section 2-4 is a curved flow channel obtained through fluid calculation, the curved flow channel realizes complete streamline, pulsation disorder is reduced, flow is optimized, and oil drops are favorably coalesced to prevent secondary crushing; the design can make the settling velocity larger, the residence time longer and the coalescence effect better, thereby achieving higher separation efficiency. Under certain centripetal acceleration, light phases (oil and suspended matters) are gathered towards the center, then pass through a small conical section 2-5 connected below a gap (a large conical section) 2-4 to enable unaggregated fine oil drops to be gathered, then the gathered light phases enter a light phase overflow port 2-9 at the lower part of an impeller head 2-10, finally are discharged from a light phase outlet 2-8 arranged at the upper part of the impeller head 2-10 to enter a BC light phase output pipe 3 and enter a post-treatment link through a BC light phase outlet 6, and on the other hand, heavy phases (water) are discharged from a heavy phase outlet 2-7 at the bottom of a primary dehydrator along a tail conical section 2-6; the separation effect is achieved;
step two: mixed fluid discharged from a heavy phase outlet 2-7 enters an axial hydrocyclone AHC 8 from an axial hydrocyclone AHC inlet 13 through a BC heavy phase output pipe 7, the structure of the axial hydrocyclone AHC 8 is different from that of a primary dehydrator BC 2, except that guide vanes are basically the same as the guide vanes, the guide vanes of the primary dehydrator BC 2 are narrow and relatively large in number, and are suitable for fluid with high oil content, the guide vanes of the axial hydrocyclone AHC 7 are in an axisymmetric wide fan shape, the area of the wide fan-shaped guide vanes is about 1/2 of the cross-sectional area of fluid water, and the guide vanes are in a streamline design close to the wall surface of the fluid, so that a cyclone flow field is stronger, the distribution is more symmetric and stable, the mixed fluid is suitable for fluid with low oil content, and a light phase of the mixed fluid enters an AHC light phase output pipe 14 and enters an aftertreatment link through an AHC light phase outlet 9;
step three: the heavy phase of the mixed fluid enters another axial hydrocyclone AHC 11 from an AHC heavy phase output pipe 10 for further separation, the light phase is discharged from an AHC light phase outlet 12, and the heavy phase is discharged after being treated from an outlet 13.
In the embodiment, the single stage mainly utilizes the centrifugal separation principle, liquid passes through the impeller to form rotational flow, centrifugal acceleration a (about 50 times of gravity acceleration g) is generated, oil drops and water in produced liquid are separated under the action of the centrifugal acceleration a, a larger settling velocity is generated due to a larger acceleration, and the settling time is about 1% of gravity separation, so that the retention time is greatly reduced. The AHC structure is shown in the figure, the centrifugal acceleration a (about 100 times of gravity acceleration g), the residence time is very short, and the volume is very small; after two-stage AHC separation, the oil content is reduced to the standard specified by the oil field.
According to the scheme, the BC retention time is less than 10s, the AHC retention time is less than 10sin, the total retention time of BC + AHC + AHC is less than 30s, the produced liquid contains oil less than 30%, and after separation through the scheme, the oil content in water at a three-stage outlet is less than 50 ppm. Because the residence time of the scheme is extremely short, the volume is very small, and the scheme is suitable for occasions with smaller space occupation requirements and less suspended matter content.
It should be understood that while the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein, and any combination of the various embodiments may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (2)
1. An oil field compact separation method for removing oil and suspended matters is characterized in that: the adopted device comprises a primary dehydrator, an axial hydrocyclone and a compact rotational flow air flotation unit, and comprises the following specific steps:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator from an inlet at the bottom of the primary dehydrator, then enters the impeller shell through an inlet hole at the upper part of the impeller shell through a gap between the impeller shell and the outer cylinder, and then flows through a guide vane arranged in the impeller shell to enable oil-water mixed fluid to generate rotational flow, the oil-water mixed fluid passes through a large cone section between the impeller shell and an impeller head, is gathered towards the center in a light phase under certain centripetal acceleration, passes through a small cone section connected below the large cone section to enable unaggregated fine oil drops to be gathered, then the gathered light phase enters a light phase overflow port at the lower part of the impeller head, finally is discharged from a light phase outlet arranged at the upper part of the impeller head, enters a light phase output pipe of the primary dehydrator, passes through the primary dehydrator and a light phase outlet of an axial hydrocyclone to enter a post-treatment link, and on the other hand, the heavy phase is discharged from a heavy phase outlet at the bottom of the primary dehydrator along a tail cone section; the separation effect is achieved;
step two: the mixed fluid discharged from the heavy phase outlet at the bottom of the primary dehydrator passes through the heavy phase output pipe of the primary dehydrator and enters the axial hydrocyclone from the inlet of the axial hydrocyclone, and the light phase of the mixed fluid enters the light phase output pipe of the axial hydrocyclone and enters the post-treatment link through the light phase outlets of the primary dehydrator and the axial hydrocyclone;
step three: the heavy phase discharged by the axial hydrocyclone passes through a heavy phase output pipe of the axial hydrocyclone and micro bubbles generated by the dissolved air pump, enters a bottom cavity of the compact cyclone air floating unit through an inlet of the compact cyclone air floating unit, stays in the bottom cavity for a short time, and is released and further mixed and adhered with oil drops; through the S-shaped inlet device arranged above the bottom cavity and at the lower end of the inner cavity, liquid generates stable rotational flow and enters the inner cavity; the bubbles and the oil drops are subjected to more collision and adhesion in the cavity of the inner cavity, the volume of the adhered body is increased, the separation probability is improved, the mixed fluid is separated under the action of the rotational flow, the light phase is close to the middle, and the oil content in the external heavy phase is reduced; meanwhile, when the mixed fluid passes through the annular coalescence plate arranged at the top of the inner cavity, the inner cavity touches the wall surface to form a larger mixture, which is beneficial to the separation of oil cores and water; oil drops and air bubble adherends are collected and discharged from the top of the outer cylinder cavity, a small amount of adherends are further coalesced in the outer cylinder cavity, so that the adherends and the water float to the top, and the water enters a light phase output pipe of the compact cyclone air flotation unit from a top overflow port at the top end of the outer cylinder cavity and enters a post-treatment link through a primary dehydrator and a light phase outlet of an axial hydrocyclone; the clean water is discharged from a water outlet at the bottom of the compact cyclone air-floating unit, passes through a heavy phase output pipe of the compact cyclone air-floating unit, is treated from the water outlet of the compact cyclone air-floating unit and then is discharged;
the structure of the axial hydrocyclone is the same as that of the primary dehydrator except for the guide vanes, the guide vanes of the axial hydrocyclone are in an axisymmetric wide fan shape, the area of the wide fan-shaped guide vanes is 1/2 of the cross section of the fluid, and the guide vanes are close to the wall surface of the fluid and are in a streamline structure.
2. An oil field compact separation method for removing oil and suspended matters is characterized in that: the adopted device comprises a primary dehydrator and two axial hydrocyclones, and comprises the following specific steps:
the method comprises the following steps: the oil-water mixture enters the primary dehydrator from an inlet at the bottom of the primary dehydrator, then enters the impeller shell through an inlet hole at the upper part of the impeller shell through a gap between the impeller shell and the outer cylinder, and then flows through a guide vane arranged in the impeller shell to enable oil-water mixed fluid to generate rotational flow, the oil-water mixed fluid passes through a large cone section between the impeller shell and an impeller head, is gathered towards the center in a light phase under certain centripetal acceleration, passes through a small cone section connected below the large cone section to enable unaggregated fine oil drops to be gathered, then the gathered light phase enters a light phase overflow port at the lower part of the impeller head, finally is discharged from a light phase outlet arranged at the upper part of the impeller head, enters a light phase output pipe of the primary dehydrator, passes through the primary dehydrator and a light phase outlet of an axial hydrocyclone to enter a post-treatment link, and on the other hand, the heavy phase is discharged from a heavy phase outlet at the bottom of the primary dehydrator along a tail cone section; the separation effect is achieved;
step two: the mixed fluid discharged from the heavy phase outlet at the bottom of the primary dehydrator passes through the heavy phase output pipe of the primary dehydrator and enters an axial hydrocyclone from the inlet of the axial hydrocyclone, and the light phase of the mixed fluid enters the light phase output pipe of the axial hydrocyclone and enters a post-treatment link through the light phase outlets of the primary dehydrator and the axial hydrocyclone;
step three: the heavy phase of the mixed fluid enters the other axial hydrocyclone from the heavy phase output pipe of the axial hydrocyclone for further separation, the light phase is discharged from the light phase outlet of the other axial hydrocyclone, and the heavy phase is discharged after being processed from the outlet of the other axial hydrocyclone;
the structure of the axial hydrocyclone is the same as that of the primary dehydrator except for the guide vanes, the guide vanes of the axial hydrocyclone are in an axisymmetric wide fan shape, the area of the wide fan-shaped guide vanes is 1/2 of the cross section of the fluid, and the guide vanes are close to the wall surface of the fluid and are in a streamline structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898230.2A CN109019913B (en) | 2018-08-08 | 2018-08-08 | Oil field compact separation method for removing oil and suspended matters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898230.2A CN109019913B (en) | 2018-08-08 | 2018-08-08 | Oil field compact separation method for removing oil and suspended matters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109019913A CN109019913A (en) | 2018-12-18 |
| CN109019913B true CN109019913B (en) | 2021-08-24 |
Family
ID=64632266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810898230.2A Active CN109019913B (en) | 2018-08-08 | 2018-08-08 | Oil field compact separation method for removing oil and suspended matters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109019913B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111378485B (en) * | 2018-12-28 | 2021-07-09 | 中国石油化工股份有限公司 | Pretreatment device and method for crude oil desalting and colloid removing suspended matter |
| CN111378484B (en) * | 2018-12-28 | 2021-07-09 | 中国石油化工股份有限公司 | Device and method for coupling crude oil suspended matter removal and oil-water separation |
| CN110510798B (en) * | 2019-08-29 | 2021-08-24 | 兰州正丰石油化工技术装备有限责任公司 | Method for deeply treating ASP flooding produced water by using microbubbles |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080006588A1 (en) * | 2006-07-10 | 2008-01-10 | Petreco International Inc. | Ultra compact cyclonic flotation system |
| CN202893542U (en) * | 2012-11-05 | 2013-04-24 | 中国石油化工股份有限公司 | Rail-type oil-gas-water three-phase separation device |
| CN103274545A (en) * | 2013-05-31 | 2013-09-04 | 中海石油（中国）有限公司番禺作业公司 | High-efficiency compact floatation unit (CFU) water treatment method applicable to offshore oil field |
| CN104773789A (en) * | 2015-04-08 | 2015-07-15 | 华东理工大学 | Compact three-phase separation method and device |
| CN204710581U (en) * | 2015-04-15 | 2015-10-21 | 北京石油化工学院 | A kind of oil well produced liquid predrainage axial entrance static hydrocyclone |
| CN106334635A (en) * | 2016-11-10 | 2017-01-18 | 青岛理工大学 | Online three-stage eddy flow dehydration device of submarine pipeline |
-
2018
- 2018-08-08 CN CN201810898230.2A patent/CN109019913B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080006588A1 (en) * | 2006-07-10 | 2008-01-10 | Petreco International Inc. | Ultra compact cyclonic flotation system |
| CN202893542U (en) * | 2012-11-05 | 2013-04-24 | 中国石油化工股份有限公司 | Rail-type oil-gas-water three-phase separation device |
| CN103274545A (en) * | 2013-05-31 | 2013-09-04 | 中海石油（中国）有限公司番禺作业公司 | High-efficiency compact floatation unit (CFU) water treatment method applicable to offshore oil field |
| CN104773789A (en) * | 2015-04-08 | 2015-07-15 | 华东理工大学 | Compact three-phase separation method and device |
| CN204710581U (en) * | 2015-04-15 | 2015-10-21 | 北京石油化工学院 | A kind of oil well produced liquid predrainage axial entrance static hydrocyclone |
| CN106334635A (en) * | 2016-11-10 | 2017-01-18 | 青岛理工大学 | Online three-stage eddy flow dehydration device of submarine pipeline |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109019913A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109019913B (en) | Oil field compact separation method for removing oil and suspended matters | |
| CN105621517B (en) | The device and method for carrying out oily waste water treatment based on single tank twin-stage cyclone air-flotation device | |
| CN110295056B (en) | Tubular electric field demulsification cyclone separator for oil-water separation | |
| CN105604535A (en) | Offshore oilfield oil-gas-water gathering and transporting system and method | |
| CN205391820U (en) | Tubular profit hydrocyclone separation equipment | |
| CN105498987B (en) | Three-phase separation cyclone separator | |
| CN103121734A (en) | Cyclone gas flotation separator | |
| CN105031977A (en) | Oil gas and water multi-phase separating system and application method thereof | |
| CN107098489B (en) | Multistage separation process and device | |
| CN105536297A (en) | Tubular oil-water cyclone separation equipment | |
| CN108862466B (en) | Equipment and method for pre-separating oily sewage based on axial vortex technology | |
| CN205687865U (en) | The vertical three phase separator of compact high efficient | |
| CN216549877U (en) | Multifunctional oil field pre-water-separation treatment equipment | |
| CN110159246B (en) | Underground multi-stage cyclone coalescence oil-water separation device | |
| CN103045295A (en) | Water removing system for gas-water-containing crude oil and application method of system | |
| CN105435489B (en) | The vertical oily-water seperating equipment of swirl reinforced with microchannel and method | |
| CN112899021B (en) | Full-gravity balance separation dehydration integrated device and crude oil treatment method | |
| CN203159348U (en) | Two-stage cyclone air flotation separator | |
| CN117298657A (en) | Oil-gas-water separation system and method for high-water-content produced liquid of ocean platform | |
| CN105999770B (en) | A kind of profit spiral stream guidance separator | |
| CN107557058B (en) | Compact combined flash crude oil degassing method and device | |
| CN203820577U (en) | All-in-one machine for comprehensive sewage treatment | |
| CN108529710B (en) | Strong whirl deoiling equipment of air supporting coalescence | |
| CN103864241A (en) | Comprehensive sewage treatment all-in-one machine | |
| CN113323645A (en) | Separation method and separation device for oil, gas and water at well mouth and application of separation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Sun Xiaodong Inventor after: Rong Jie Inventor before: Rong Jie |
|
| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220214 Address after: 620000 room 1, floor 1, building 1, No. 8-1, Section 2, Tengfei Avenue, Shigao street, Renshou County, Meishan City, Sichuan Province Patentee after: Sichuan Jinghai Petroleum Equipment Manufacturing Co.,Ltd. Patentee after: Qingdao yisany oil and Gas Technology Co., Ltd Address before: 266000 2 Hui Ying Street, Jiaozhou economic and Technological Development Zone, Qingdao, Shandong Patentee before: OTO OIL AND GAS TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |