CN113230697A - Three-phase vertical rapid treatment device and method for oilfield produced liquid - Google Patents
Three-phase vertical rapid treatment device and method for oilfield produced liquid Download PDFInfo
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- CN113230697A CN113230697A CN202110457741.2A CN202110457741A CN113230697A CN 113230697 A CN113230697 A CN 113230697A CN 202110457741 A CN202110457741 A CN 202110457741A CN 113230697 A CN113230697 A CN 113230697A
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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
- B01D17/02—Separation of non-miscible liquids
- B01D17/0205—Separation of non-miscible liquids by gas bubbles or moving solids
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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
- B01D17/02—Separation of non-miscible liquids
- B01D17/04—Breaking emulsions
- B01D17/045—Breaking emulsions with coalescers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
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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
- C10G31/00—Refining of hydrocarbon oils, in the absence of hydrogen, by methods not otherwise provided for
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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
- C10G33/06—Dewatering or demulsification of hydrocarbon oils with mechanical means, e.g. by filtration
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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
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1033—Oil well production fluids
Abstract
The invention discloses a three-phase vertical rapid treatment device and a three-phase vertical rapid treatment method for oilfield produced liquid. The invention is mainly used for the separation treatment of oil-gas-water mixture in the field of oil-gas field produced liquid treatment or the field of offshore oil production platform produced liquid treatment, the water content of the oil phase separated by the device is less than 0.5 percent, and the oil phase can be directly conveyed to an oil refinery; the oil content of the separated water phase is less than 5mg/l, the suspended matter content is less than 10mg/l, and the water quality standard that the general permeability stratum can be directly reinjected is met; the oil content of the separated gas phase (such as natural gas) is less than 0.1 percent, and the separated gas phase is directly conveyed to a natural gas deep processing plant. The device is adopted to treat the produced liquid, so that the efficiency is high, the separated oil phase, water phase and gas phase do not need to be processed, the subsequent procedures can be simplified, and the treatment cost can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a three-phase vertical rapid treatment device and a three-phase vertical rapid treatment method for oil field produced liquid.
Background
The three-phase main substance components contained in the offshore (or land) oilfield produced liquid are respectively hydrocarbon (petroleum), hydrocarbon (natural gas) and produced water containing more than 80%, and the produced liquid also contains a small amount of silt suspended substances (asphalt paraffin and organic colloidal particles), so that the oil-gas-water three-phase separation and the harmless removal of the silt suspended substances are the whole system for treating the oilfield produced liquid. According to the technical scheme of the oil-gas-water horizontal three-phase separator adopted at present, the horizontal tank body of the separator comprises a cylindrical barrel body and two end sealing heads, a liquid inlet pipe, an oil outlet pipe, an air outlet pipe and a blow-off pipe are arranged on the separator, an overflow plate, a flow divider and other internal components are arranged in an inner cavity of the tank body, when produced liquid mixture enters the three-phase separator, the gas-liquid separation is firstly realized through a gas-liquid separator to primarily separate the air-liquid two phases, and the gas phase is gathered and output from a filter screen to the top of the tank. The separated liquid phase (including oil phase and water phase) enters a liquid collecting region, a demulsifying agent and corrugated plate filler demulsifying, coalescing and settling process is added in the liquid collecting region, oil and water are layered by depending on the density difference of the oil and the water, the layered crude oil and sewage are respectively output by an oil outlet pipe and a water outlet pipe, and silt is statically settled at the bottom of the tank for a long time under the action of gravity.
However, the following problems still exist in the prior art: (1) the existing three-phase separator has low efficiency of separating crude oil, the crude oil can only treat dispersed oil and floating oil with the particle size of more than 2 microns, but emulsified oil and dissolved oil with the particle size of less than 2 microns are difficult to treat, and the effect is common even by combining physicochemical comprehensive treatment schemes such as demulsifying agent, demulsifying and filling and the like, so that the separated crude oil has a water-in-oil emulsification phenomenon, the water content of the crude oil can not reach the standard and can be transported to an oil refinery after being subjected to demulsification, dehydration and large-tank static settlement by electric dehydration equipment, and the cost of crude oil dehydration is increased; (2) crude oil in water phase separated by the existing three-phase separator has crude oil emulsification of oil-in-water and large organic suspended matters such as silt, asphalt and paraffin, so that the oil content and the suspended matters in water exceed the standard, can not be directly reinjected for cyclic utilization, and need to be conveyed to a sewage treatment plant for treatment, and can be reinjected into a stratum after reaching the standard through a plurality of treatment links such as sewage tank sedimentation, medicine adding, filtration and the like of the treatment plant, thereby increasing the operation cost of sewage sludge treatment of the treatment plant; (3) silt separated by most of the existing three-phase separators settles at the bottom of the tank statically for a long time, which affects the treatment effect, even if the silt is cleaned, the silt still contains oil, which affects the environment; and simultaneously, a gravity settling separation mode is adopted, so that the equipment is large in manufacturing volume and high in cost.
The existing problems of most of the existing three-phase settling separation technologies can not meet the requirements of oilfield produced fluid treatment, and devices and technologies with higher efficiency and better separation effect are urgently expected to be solved.
Disclosure of Invention
Therefore, based on the above background, the present invention provides a three-phase vertical rapid treatment device for oilfield produced fluid, which not only can realize rapid separation of oil, gas, water and silt, but also can directly convey separated hydrocarbon phase substances (such as natural gas) to a natural gas advanced treatment plant; the separated hydrocarbon phase substances (such as crude oil) are completely recovered into good oil and directly output to an oil refinery, and the separated water phase reaches the standard and is directly reinjected for recycling; the separated pure silt phase can be automatically removed in time, the separation efficiency can be greatly improved, and the separation cost is reduced.
The technical scheme provided by the invention is as follows:
a three-phase vertical rapid treatment device for oil field produced liquid comprises a vertical first shell, wherein a seal head is arranged above the first shell, a silt gathering tank is arranged at the bottom of the first shell, and a filter screen, a three-phase separation releaser and a plurality of oil removal hangers which are uniformly distributed are sequentially arranged in the first shell from top to bottom;
the top of the seal head is provided with an air outlet a, the air outlet a is connected with an external air conveying pipe, and the middle upper part of the first shell is provided with an oil outlet d;
the oil outlet d is connected with an external oil conveying pipeline and is positioned between the filter screen and the oil removal hanger;
a feed inlet f is formed in the first shell and located below the oil removal hanger, the feed inlet f is connected with a feed pipeline, a liquid inlet pipeline connected with the feed inlet f is arranged in a shell cavity of the first shell, and the other end of the liquid inlet pipeline is connected with an inlet of the three-phase separation releaser;
a water outlet h and a water inlet g are arranged below the first shell, the water inlet g is positioned above the water outlet h, and the water outlet h and the water inlet g are positioned between the silt gathering tank and the oil removal suspension device; the water outlet h is connected with an inlet of a circulating pump through a pipeline, a water taking pipeline connected with the water outlet h is arranged in a shell cavity of the first shell, and an outlet of the circulating pump is connected with a water inlet g through a circulating pipeline; a water inlet pipeline connected with the water inlet g is arranged in the shell cavity of the first shell, and the other end of the water inlet pipeline is connected with the liquid inlet pipeline;
a water intake e is arranged between the oil removal hanger and the sediment accumulation tank of the first shell, and is connected with the external water conveying pipeline;
and a silt outer discharge port i connected with the silt outer discharge pipeline is arranged at the bottom of the silt gathering tank.
The invention is further described in that the other end of the external oil delivery pipe is connected with an external compressor, and the other end of the external oil delivery pipeline is connected with an inlet of an external oil delivery pump.
The invention is further described in that the water inlet line is the same line as the recycle line and the liquid inlet line is the same line as the feed line.
The invention is further described, the three-phase separation releaser comprises a second shell, a reducing release pipe, an oil-gas-water separation chamber and a produced liquid cache pipe, wherein the reducing release pipe is arranged on the produced liquid cache pipe, and the inner diameter of the reducing release pipe from the produced liquid cache pipe to the other end of the reducing release pipe is increased from small to large.
The invention is further described, the oil removing suspension device comprises a cylinder body, a fixing column positioned in the center of the cylinder body and a special-shaped aggregation sheet, wherein the fixing column is a round rod or a pipe body, and the special-shaped aggregation sheet is formed by machining a steel plate subjected to sand blasting by a folding machine.
The invention is further described in that the oil removal hanger is vertically arranged, the lower end of the oil removal hanger penetrates through a through hole corresponding to a circular porous first fixed steel plate and is fixed, the upper end of the oil removal hanger penetrates through a through hole corresponding to a circular porous second fixed steel plate and is fixed, and the first fixed steel plate and the second fixed steel plate are respectively connected to the inner wall of the first shell.
The invention is further described, an oil-gas interface sensor and a first pressure sensor for detecting gas phase pressure at the top of the first shell are arranged on the end socket, a second pressure sensor for detecting material pressure in the pipe cavity is arranged on the feed pipe line positioned outside the first shell, a probe of the oil-gas interface sensor extends 200 cm into the first shell, and a probe of the first pressure sensor extends 30 cm into the first shell.
Further describing the invention, an internal oil pipe connected with the oil outlet d is arranged in the shell cavity of the first shell.
The invention is further described, the other end of the external water delivery pipeline is connected with an inlet of a water injection pump, and an internal water delivery pipe connected with the water intake e is arranged in the shell cavity of the first shell 1.
The invention is further described as having an automatic blowdown valve mounted on the outer discharge line.
The invention also provides a method for quickly treating the oilfield produced liquid, which adopts the three-phase vertical quick treatment device for the oilfield produced liquid to treat the produced liquid.
The invention is further described, the oil field three-phase produced fluid with certain pressure flows into a three-phase separation releaser through a feed inlet f and a feed inlet pipeline, compressed gas-phase substances are quickly ejected together with liquid-phase substances through a reducing release pipe arranged in the three-phase separation releaser and collide with the inner wall of a second shell of the three-phase separation releaser, the multi-phase substance is separated in a second stage, countless micro-nano-scale small bubbles are generated by the gas-phase substances released instantly at normal pressure, the micro-bubbles are adhered and carry oil drops with the particle size of more than 2 microns in the liquid phase and organic suspended substances such as large-particle paraffin asphalt and the like, the oil drops and the organic suspended substances quickly float up and are coalesced in a crude oil coalescence area (B area), the gas separated by the small bubbles reaching the B area is floated to a natural gas gathering area (A area) through a gas filter screen, and the separated water phase comprises emulsified and demulsified oil drops (oil in water) with the particle size of less than 2 microns and large-particle paraffin asphalt and the like and enters a suspension removal unit The oil-removing suspension device comprises a region (region C), wherein a plurality of groups of oil-removing suspension devices are uniformly distributed in the region C, each oil-removing suspension device can work independently, and when oil-containing suspension water enters the oil-removing suspension device, under the power action of a circulating pump, small emulsified oil drops perform collision friction motion on the surface of a special-shaped aggregation sheet from top to bottom at a certain speed, so that the surface tension of oil-in-water or water-in-oil is rapidly opened, and the small oil drops are released and are aggregated into larger oil drops to be separated from water; large organic suspended matters such as paraffin asphalt contained in water are repeatedly collided and rubbed on the surface of a special-shaped aggregation sheet in the oil removal suspension device, each small particle is provided with positive and negative charges, then the large organic suspended matters are aggregated into larger suspended matters through the dipolarity aggregation motion of the charged particles, large oil drops with the particle size of more than 2 microns and the suspended matters of the large oil drops are conveyed into a first shell through a water taking pipeline through a circulating pump and are mixed with an incoming liquid pipeline, then the large oil drops are conveyed into a three-phase separation release device again, oil, gas and water are separated out through the three-phase separation release device, the separated oil-containing suspended water with the particle size of less than 2 microns in a water phase enters a C area, the oil-containing suspended water is treated by the oil removal suspension device and then is mixed with the incoming liquid pipeline and is conveyed into the three-phase separation release device, and the oil removal suspension with the circular motion is realized; after the oil and suspended matters removed by the C area (demulsification suspension removal unit area), the water phase sinks to the clear water buffer area (D area), and a small amount of inorganic matters such as silt naturally sinks to the silt collecting tank at the bottom of the inner cavity of the first shell under the action of gravity.
By adopting the technical scheme, the method has the following beneficial effects:
the device and the processing method are mainly used for separating oil-gas-water mixtures in the field of oil-gas field produced liquid processing or the field of offshore oil production platform produced liquid processing, the produced liquid is separated, the water content of the separated oil phase is less than 0.5 percent, and the separated oil phase can be directly conveyed to an oil refinery; the oil content of the separated water phase is less than 5mg/l, the suspended matter content is less than 10mg/l, and the water quality standard that the general permeability stratum can be directly reinjected is met; the oil content of the separated gas phase (such as natural gas) is less than 0.1 percent, and the separated gas phase is directly conveyed to a natural gas deep processing plant. The method has high efficiency for treating the produced liquid, and the separated oil phase, water phase and gas phase do not need to be processed, so that the subsequent procedures can be simplified, and the treatment cost can be greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1A-A;
FIG. 3 is a schematic view of the construction of the three-phase separation release of the present invention;
FIG. 4 is a cross-sectional view of FIG. 3B-B;
FIG. 5 is a schematic view of the oil removal suspension of the present invention;
FIG. 6 is a schematic top view of the oil removal suspension of the present invention;
in the figure: 1-a first housing; 2-a feed line; 3-a first fixed steel plate; 4-oil removal suspension device; 5-a circulating pump; 6-a second fixed steel plate; 7-three phase separation releaser; 8-a filter screen; 9-oil gas interface sensor; 10-an output compressor; 11-external trachea; 12-a first pressure sensor; 13-an external oil delivery pump; 14-an external oil transfer line; 140-connecting an oil pipe internally; 15-water injection pump; 16-an external water conveying pipeline; 160-internal water connecting pipe; 17-automatic blowdown valve; 18-a silt discharge line; 19-a silt collecting tank; 20-a pipeline; 200-water taking pipeline; 21-a second housing; 211-a liquid inlet line; 22-reducing release pipe; 23-oil-gas-water separation chamber; 24-produced liquid buffer pipe; 25-a cylinder body; 26-fixed columns; 27-special-shaped conglomerate sheets; 28-a second pressure sensor; 29-a recycle line; 290-water inlet line.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The invention is further described below with reference to the accompanying drawings.
Example 1: the three-phase vertical rapid treatment device for the oil field produced liquid shown in fig. 1 to 6 comprises a vertical first shell 1, wherein a circular end enclosure is arranged above the first shell 1, a silt collecting tank 19 is arranged at the bottom of the first shell 1, and a filter screen 8, a three-phase separation releaser 7 and a plurality of oil removal hangers 4 which are uniformly distributed are sequentially arranged in the first shell 1 from top to bottom;
the center of the top of the seal head is provided with an air outlet a, the air outlet a is connected with an outer air conveying pipe 11, and the middle upper part of the first shell 1 is provided with an oil outlet d;
the oil outlet d is connected with an external oil conveying pipeline 14, and the oil outlet d is positioned between the filter screen 8 and the oil removal suspension device 4;
a feed inlet f is formed in the first shell 1, a feed inlet f is formed in a shell cavity of the first shell 1 and located below the oil removal suspension device 4, the feed inlet f is connected with a feed pipeline 2, a liquid inlet pipeline 211 connected with the feed inlet f is formed in the shell cavity of the first shell 1, and the other end of the liquid inlet pipeline 211 is connected with an inlet of the three-phase separation release device 7;
a water outlet h and a water inlet g are arranged below the first shell 1, the water inlet g is positioned above the water outlet h, and the water outlet h and the water inlet g are positioned between the silt accumulation tank 19 and the oil removal suspension device 4; the water outlet h is connected with an inlet of a circulating pump 5 through a pipeline 20, a water taking pipeline 200 connected with the water outlet h is arranged in a shell cavity of the first shell 1, and an outlet of the circulating pump 5 is connected with a water inlet g through a circulating pipeline 29; the shell cavity of the first shell 1 is internally provided with a water inlet pipeline 290 connected with the water inlet g, the other end of the water inlet pipeline 290 is connected with the liquid inlet pipeline 211, and the design can realize the continuous work of the circulating pump 5 to ensure that the oily suspension sewage carries out dipole motion of suspended matters such as repeated collision, friction, coalescence and the like above and below the oil removal hanger 4 on the oil removal suspension unit, thereby realizing the purpose of quickly demulsifying and removing the suspension to achieve water purification.
A water intake e is arranged between the oil removal hanger 4 and the sediment accumulation groove 19 of the first shell 1, and is connected with the external water conveying pipeline 16;
and a silt discharging port i connected with the silt discharging pipeline 18 is arranged at the bottom of the silt accumulating tank 19.
The other end of the external gas transmission pipe 11 is connected with an external compressor 10, and the other end of the external oil transmission pipeline 14 is connected with an inlet of an external oil transmission pump 13; the external compressor 10 is a variable frequency compressor, and the external oil pump 13 is a variable frequency oil pump.
In specific implementation, the filter screen 8 is made of multiple layers of metal meshes and fixed in a metal frame, and is fixed to the inner wall of the first housing 1 through the metal frame.
The water inlet line 290 and the circulation line 29 are the same line, the liquid inlet line 211 and the feed line 2 are the same line, the line 20 and the water taking line 200 are the same line, and the internal water connecting pipe 160 and the external water conveying line 16 are the same line.
Three-phase separation releaser 7 includes second casing 21, reducing release pipe 22, oil-gas-water separation room 23 and production fluid buffer memory pipe 24, reducing release pipe 22 is installed on production fluid buffer memory pipe 24, reducing release pipe 22 begins its internal diameter by little grow to its other end from production fluid buffer memory pipe 24.
In practical application, the number of the reducing release pipes 22 is generally 8 to 12, and the flow velocity v range of the three-phase medium is generally controlled to be 8 to 10 meters per second, which is beneficial to reducing the particle size and increasing the number of the micro-bubbles. When the flow Q of the produced liquid and the number n of the reducing release pipes are fixed values, the flow velocity V value is generally realized by calculating the phi 0 of the reducing pipe. The oil-gas-water separation chamber 23 provided in the three-phase separation releaser 7 has an effective volume in consideration of the time required for separating the three-phase medium, and generally requires 5 seconds of separation time to design the capacity of the separation chamber. The oil, gas and water of the three-phase separation releaser 7 are provided by a feed line 2 through a feed port f and a line 20.
The oil removal hanger 4 comprises a cylinder 25, a fixing column 26 and a special-shaped aggregation sheet 27, wherein the fixing column 26 is located in the center of the cylinder 25, the fixing column 26 is a round rod or a pipe body, and the special-shaped aggregation sheet 27 is formed by machining a steel plate subjected to sand blasting through a folding machine.
The oil removal hanger 4 is placed vertically, the lower end of the oil removal hanger penetrates through a through hole corresponding to the circular porous first fixing steel plate 3 and is fixed, the upper end of the oil removal hanger penetrates through a through hole corresponding to the circular porous second fixing steel plate 6 and is fixed, and the first fixing steel plate 3 and the second fixing steel plate 6 are connected to the inner wall of the first shell 1 respectively.
In specific implementation, the special-shaped coalescing piece 27 is generally divided into three groups and uniformly distributed between the cylinder 25 and the fixed column 26, the fixed column 26 is generally a round stainless steel rod or a pipe body, the special-shaped coalescing piece 27 is generally formed by selecting a stainless steel plate with the thickness of 2-3 mm and performing sand blasting and then adding the stainless steel plate to a folding machine, and the concave-convex shape formed by sand blasting increases the specific surface area for breaking contact between water drum oil and suspended matters, so that the oil suspension coalescence speed is favorably realized.
Be equipped with oil gas interface sensor 9 on the head, be used for detecting first casing 1 top gas phase pressure's first pressure sensor 12, be located outside first casing 1 install the second pressure sensor 28 that is used for detecting the material pressure in the lumen on the feed line 2, oil gas interface sensor 9 probe extends 200 centimetres into first casing 1, can accurately detect gas-liquid two-phase interface height and oil phase buffer memory thickness (for example crude oil) first pressure sensor 12's probe extends 30 centimetres into first casing 1, apart from the gas outlet apart from some far away, atmospheric pressure when preventing the gas outlet exhaust disturbs instrument detection accuracy.
An internal connection oil pipe 140 connected with the oil outlet d is arranged in a shell cavity of the first shell 1, an oil receiving port is arranged at the other end of the internal connection oil pipe 140, the vertical height of the oil receiving port is generally arranged at the position of an oil phase thickness middle layer, and the diameter of the internal connection oil pipe is generally arranged at about phi 200 cm, so that the output water content of the oil phase is reduced.
The other end of the external water delivery pipeline 16 is connected with an inlet of a water injection pump 15, and an internal water pipe 160 connected with the water intake e is arranged in the shell cavity of the first shell 1.
An automatic blowdown valve 17 is mounted on the outer discharge pipeline 18.
In the invention, an area A is arranged between the end socket and the filter screen 8, namely a natural gas gathering area, an area B is arranged between the filter screen 8 and the separation releaser 7, namely a crude oil gathering area, the three-phase separation releaser 7 is positioned at the middle lower part of the area B, an area C is arranged between the lower part of the three-phase separator 7 and the circulating pump 5, namely an emulsion breaking and suspension removing area, and an area D is arranged between one end of the water taking pipeline 200 positioned in the shell and the sediment gathering tank 19, namely a clear water area.
In practice, the materials of the components of the present invention are generally stainless steel (e.g., 304L or 316L), and the components are typically joined by welding.
The specific method for processing the invention comprises the following steps:
the multiphase mixture of produced liquid (oil, gas and water and the like) with the pressure of 0.25-0.5MPa flows into a three-phase separation releaser 7 through a feed inlet f and a liquid inlet 211 through a feed pipeline 2, compressed gas-phase substances (such as natural gas) together with liquid-phase substances (such as crude oil and water) are rapidly ejected and collide with the inner wall of a second shell 21 of the three-phase separation releaser 7 through 8-12 reducing release pipes 22 arranged in the three-phase separation releaser 7, the second-stage separation of the multiphase substances is realized, the gas-phase substances released instantly at normal pressure generate countless micro-nano-scale small bubbles, oil drops with the particle size of more than 2 microns in the micro-bubble viscous liquid carrying phase and organic suspended matters such as large-particle paraffin asphalt and the like, the oil drops with the particle size of more than 2 microns in the micro-bubble viscous liquid carrying phase and the large-particle paraffin asphalt and the like, the gas separated by the small bubbles breaking in the, the separated water phase comprises emulsified and dissolved oil drops (oil-in-water) with the particle size of less than 2 microns and large organic suspended matters such as paraffin asphalt and the like which enter a C area (demulsification suspension removal unit area), a plurality of groups of oil removal suspension devices 4 are uniformly distributed in the C area, each oil removal suspension device 4 can work independently, and when oil-containing suspension water enters the oil removal suspension device 4, under the power action of a circulating pump 5, the tiny emulsified oil drops perform collision friction motion on the surface of the special-shaped aggregation sheet 27 from top to bottom at a certain speed, so that the surface tension of the oil-in-water or the oil-in-water is quickly opened, and the tiny oil drops are released and are aggregated into larger oil drops to be separated from the water. In the same way, large organic suspended matters such as paraffin asphalt contained in water are repeatedly collided and rubbed on the surface of the special-shaped aggregation sheet 27 in the oil removal suspension device 4 to enable each small particle to be charged positively and negatively, then are subjected to dipole aggregation movement of the charged particles to be aggregated into larger suspended matters, large oil drops and suspended matters with the particle size larger than 2 micrometers which are aggregated in the water are conveyed into the first shell 1 through the water taking pipeline 200 through the circulating pump and are mixed with the liquid inlet pipeline 211 and then are conveyed into the three-phase separation release device 7 again, oil, gas and water are separated out through the three-phase separation release device 7 and are multiphase, wherein the oil-containing suspended water with the particle size smaller than 2 micrometers in the separated water phase enters the C area, and are treated by the oil removal suspension device 4 and then are mixed with the liquid inlet pipeline 211 and conveyed into the three-phase separation release device 7, so that the purpose of circular movement oil removal suspension is achieved. After the oil and suspended matters removed by the C area (demulsification suspension removal unit area), the water phase sinks to the D area (clear water buffer area), and a small amount of inorganic matters such as silt naturally sinks to the silt collecting tank 19 at the bottom of the inner cavity of the first shell 1 under the action of gravity.
In the specific implementation of the invention, gas phase (such as natural gas) substances in the area A in the first shell 1 are hermetically conveyed to a far end (such as a natural gas treatment plant) through the variable-frequency external-conveying compressor 10 connected with the external-conveying pipe 11 connected with the air outlet a, meanwhile, the air pressure in the inner cavity of the first shell 1 is kept in a normal pressure state, and the rotation speed of the variable-frequency external-conveying compressor 10 is automatically controlled by real-time data detected by the first pressure sensor 12 arranged at the top of the end socket to realize interlocking. Crude oil substances in a region B (such as a crude oil accumulation region) in the device are hermetically conveyed to a far end (a refinery for deep processing) through a variable frequency external oil conveying pump 13 connected with an external oil conveying pipeline 14 connected with an oil outlet d, meanwhile, the shell cavity oil thickness of the first shell 1 is kept at 0.3-0.5 m, and the rotation speed of the variable frequency external oil conveying pump 13 is automatically controlled by real-time data detected by an oil-gas interface sensor 9 arranged in the device. The water phase of the oil and suspended matters removed by the C area (demulsification suspension removal unit area) is cached to the D area (clear water area), meanwhile, the efficiency of each oil suspension removal device 4 in the C area (demulsification suspension removal area) is related to the movement speed and flow of the water fluid, and the increase or decrease of the flow speed of the fluid in the C area can be realized by setting the rotating speed of the variable-frequency circulating pump 5. Clean water in a D area (such as a clean water area) in the device is hermetically conveyed to a remote end (such as a water injection well) for water injection and oil extraction and recycling through a variable frequency water injection pump 15 connected with an external water conveying pipeline 16 connected with a water intake e through the first shell 1. Meanwhile, the distance between the oil-gas interface in the shell cavity of the first shell 1 and the top of the end socket is generally kept between 1 and 1.2 meters, and the rotation speed of the variable-frequency water injection pump 15 is automatically controlled by real-time data detected by an oil-gas interface sensor 9 arranged outside the top of the end socket of the first shell 1. Clean silt in the silt gathering tank 19 is automatically discharged at regular time through an electric automatic blow-down valve 17 connected with a silt discharge pipeline 18 at the bottom of the device.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A three-phase vertical rapid treatment device for oil field produced liquid is characterized by comprising a vertical first shell, wherein a seal head is arranged above the first shell, a silt gathering tank is arranged at the bottom of the first shell, and a filter screen, a three-phase separation releaser and a plurality of oil removal hangers which are uniformly distributed are sequentially arranged in the first shell from top to bottom;
the top of the seal head is provided with an air outlet a, the air outlet a is connected with an external air conveying pipe, and the middle upper part of the first shell is provided with an oil outlet d;
the oil outlet d is connected with an external oil conveying pipeline and is positioned between the filter screen and the oil removal hanger;
a feed inlet f is formed in the first shell and located below the oil removal hanger, the feed inlet f is connected with a feed pipeline, a liquid inlet pipeline connected with the feed inlet f is arranged in a shell cavity of the first shell, and the other end of the liquid inlet pipeline is connected with an inlet of the three-phase separation releaser;
a water outlet h and a water inlet g are arranged below the first shell 1, the water inlet g is positioned above the water outlet h, and the water outlet h and the water inlet g are positioned between the silt gathering tank and the oil removal suspension device; the water outlet h is connected with an inlet of a circulating pump through a pipeline, a water taking pipeline connected with the water outlet h is arranged in a shell cavity of the first shell, and an outlet of the circulating pump is connected with a water inlet g through a circulating pipeline; a water inlet pipeline connected with the water inlet g is arranged in the shell cavity of the first shell, and the other end of the water inlet pipeline is connected with the liquid inlet pipeline;
a water intake e is arranged between the oil removal hanger and the sediment accumulation tank of the first shell, and is connected with the external water conveying pipeline;
and a silt outer discharge port i connected with the silt outer discharge pipeline is arranged at the bottom of the silt gathering tank.
2. The vertical three-phase rapid processing device for oil field produced fluid according to claim 1, wherein the other end of the external gas transmission pipe is connected with an external compressor, and the other end of the external oil transmission pipeline is connected with an inlet of an external oil transmission pump.
3. The vertical rapid three-phase treatment device for oilfield produced fluid according to claim 1, wherein the water inlet pipeline and the circulation pipeline are the same pipeline, and the liquid inlet pipeline and the feed pipeline are the same pipeline.
4. The vertical quick processing device of three-phase for oil field production liquid of claim 1, characterized in that the three-phase separation releaser includes second casing, reducing release pipe, oil-gas-water separation chamber and production liquid buffer pipe, the reducing release pipe is installed on the production liquid buffer pipe, the reducing release pipe begins from production liquid buffer pipe to its other end its internal diameter from little grow.
5. The three-phase vertical rapid treatment device for the oilfield produced fluid according to claim 1, wherein the oil removal hanger comprises a cylinder body, a fixed column positioned in the center of the cylinder body, and a special-shaped aggregation sheet, wherein the fixed column is a round rod or a pipe body, and the special-shaped aggregation sheet is formed by machining a steel plate subjected to sand blasting by using a folding machine;
the oil removal hanger is placed vertically, the lower end of the oil removal hanger penetrates through a through hole corresponding to a first round porous fixed steel plate and is fixed, the upper end of the oil removal hanger penetrates through a through hole corresponding to a second round porous fixed steel plate and is fixed, and the first fixed steel plate and the second fixed steel plate are connected to the inner wall of the first shell respectively.
6. The vertical quick processing device of three-phase for oil field production fluid of claim 1, characterized in that, be equipped with oil gas interface sensor, be used for detecting first casing top gas phase pressure's first pressure sensor on the head, be located outside the first casing on the inlet pipe line install be used for detecting the second pressure sensor of pipe intracavity material pressure, oil gas interface sensor probe extends 200 centimetres into first casing, first pressure sensor's probe extends 30 centimetres into first casing.
7. The three-phase vertical rapid treatment device for the oil field produced fluid according to claim 1, characterized in that an internal oil pipe connected with an oil outlet d is arranged in the shell cavity of the first shell; the other end of the external water delivery pipeline is connected with an inlet of a water injection pump, and an internal water pipe connected with the water intake e is arranged in a shell cavity of the first shell.
8. The vertical, rapid three-phase treatment apparatus for oilfield produced fluids of claim 1, wherein the external drain line is fitted with an automatic drain valve.
9. A method for rapidly treating oilfield produced fluid, which is characterized in that the three-phase vertical rapid treatment device for oilfield produced fluid of any one of claims 1 to 8 is adopted to treat the produced fluid.
10. The method of claim 9, wherein the three-phase produced fluid of the oil field with a certain pressure flows into the three-phase separation releaser through the feed inlet f and the feed inlet pipeline, the compressed gas phase substance is rapidly ejected together with the liquid phase substance through the reducing release pipe arranged in the three-phase separation releaser and collides with the inner wall of the second shell of the three-phase separation releaser, the multi-phase substance is separated in second order, the gas phase substance released instantly at normal pressure generates numerous micro-nano-sized small bubbles, the micro-bubbles adhere to oil drops with a particle size of more than 2 microns in the liquid phase and organic suspended matters such as large-grained paraffin asphalt and the like, and rapidly float up and coalesce in the crude oil gathering zone (zone B), the gas separated by the small bubbles reaching the zone B floats up to the natural gas gathering zone (zone A) through the gas filter screen, the separated water phase comprises emulsified and dissolved oil drops (oil-in-water) with the particle size of less than 2 microns and large organic suspended matters such as paraffin asphalt and the like, which enter a demulsification suspension removal unit area (area C), a plurality of groups of oil removal suspension devices are uniformly distributed in the area C, each oil removal suspension device can work independently, and when oil-containing suspension water enters the oil removal suspension devices, under the power action of a circulating pump, tiny emulsified oil drops perform collision friction motion on the surface of a special-shaped aggregation sheet from top to bottom at a certain speed, so that the surface tension of the oil-in-water or oil-in-water is rapidly opened, and the tiny oil drops are released and aggregated into larger oil drops to be separated from the water; large organic suspended matters such as paraffin asphalt contained in water are repeatedly collided and rubbed on the surface of a special-shaped aggregation sheet in the oil removal suspension device, each small particle is provided with positive and negative charges, then the large organic suspended matters are aggregated into larger suspended matters through the dipolarity aggregation motion of the charged particles, large oil drops with the particle size of more than 2 microns and the suspended matters of the large oil drops are conveyed into a first shell through a water taking pipeline through a circulating pump and a pipeline and are mixed with a liquid inlet pipeline, then the large oil drops are conveyed into a three-phase separation release device again, oil-gas-water multiple phases are separated by the three-phase separation release device, the separated oil-containing suspended water with the particle size of less than 2 microns in a water phase enters a C area, the oil-containing suspended water is treated by the oil removal suspension device and then is mixed with the liquid inlet pipeline and is conveyed into the three-phase separation release device, and the oil removal suspension with the circular motion is realized; after the oil and suspended matters removed by the C area (demulsification suspension removal unit area), the water phase sinks to the clear water buffer area (D area), and a small amount of inorganic matters such as silt naturally sinks to the silt collecting tank at the bottom of the inner cavity of the first shell under the action of gravity.
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| CN202110457741.2A CN113230697A (en) | 2021-04-27 | 2021-04-27 | Three-phase vertical rapid treatment device and method for oilfield produced liquid |
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| CN202110457741.2A CN113230697A (en) | 2021-04-27 | 2021-04-27 | Three-phase vertical rapid treatment device and method for oilfield produced liquid |
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| US5527461A (en) * | 1994-06-02 | 1996-06-18 | Hill; Gordon A. | Airlift oil scavenger |
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