CN115161069A - Distributor, oil product dehydration device, oil product dehydration system and method - Google Patents
Distributor, oil product dehydration device, oil product dehydration system and method Download PDFInfo
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- CN115161069A CN115161069A CN202110365713.8A CN202110365713A CN115161069A CN 115161069 A CN115161069 A CN 115161069A CN 202110365713 A CN202110365713 A CN 202110365713A CN 115161069 A CN115161069 A CN 115161069A
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- 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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Abstract
The invention provides a distributor, an oil product dehydration device, an oil product dehydration system and a method, wherein the distributor comprises dispersion pipes and cross guide pipes, the dispersion pipes are connected end to form a closed loop, the cross guide pipes are arranged in the closed loop, and the open ends of the cross guide pipes are arranged at the cross points of the cross guide pipes, so that a sample to be processed can enter the dispersion pipes through the open ends via the cross guide pipes; a plurality of small holes are arranged on the inclined lower side of a closed loop formed by connecting the head and the tail of the dispersion pipes. The oil product dehydration device comprises a dehydration tank, the distributor is arranged at the bottom of the dehydration tank, and a liquid inlet pipeline of the dehydration tank is connected with the opening end of a cross conduit of the distributor. The invention also provides a system and a method for dehydrating the oil product. The invention adopts the concept of small feeding, slow feeding and establishment of a sufficient stable field and is based on the theory of large tank sedimentation dehydration, and the water content of the oil product after deep dehydration is less than 0.1wt% by deep dehydration only by adopting a physical sedimentation dehydration mode.
Description
Technical Field
The invention relates to a distributor, an oil product dehydration device, an oil product dehydration system and an oil product dehydration method, and belongs to the technical field of oil product dehydration.
Background
Crude oil extracted from a well generally contains a certain amount of water, and the crude oil contains more water, which causes waste in storage and transportation, increases equipment and consumes more energy; most of water in the crude oil contains salts, so that corrosion of equipment, containers and pipelines is accelerated; in the process of refining petroleum, when water and crude oil are heated together, the water can be vaporized and expanded rapidly, the pressure rises, the normal operation and the product quality of a refinery are affected, and even explosion can occur. Therefore, before transporting the crude oil out, dehydration is carried out so that the water content does not exceed 0.5wt%.
All oil fields need to go through a water-containing development period, particularly oil fields with high oil extraction speed and enhanced development by water injection, the water-free oil extraction period is generally short, the oil wells see water early, and the water content of crude oil is increased quickly. The water content of crude oil not only increases the load on equipment during storage, transportation, and refining, but also increases fuel consumption at elevated temperatures, and even causes fouling or corrosion of equipment and pipes due to the salt content in water, etc. Therefore, the water content of the crude oil is harmless and beneficial. However, water is almost an 'always-on' partner of crude oil in the process of oil field development, and particularly in the middle and later stages of oil field development, an oil well does not produce water, and oil is not available. Therefore, the dehydration of the crude oil becomes an indispensable link in the development process of the oil field and is always paid attention by people.
The SAGD airtight dehydration test station for the oil field in Xinjiang Fengcheng analyzes the properties of SAGD produced liquid and the requirements of products, and preferably selects a scheme of treatment by large-tank sedimentation depending on a No. 1 thickened oil combination station in Xinjiang Fengcheng, wherein the operating temperature of a purified oil tank is 160 ℃, the operating pressure is 101.3KPa, the retention time is 48h, and the water content of effluent liquid is 1.5wt%.
Chinese patent CN103980933B discloses a demulsifier for rapid dehydration of condensate oil after acid fracturing and a preparation method thereof, wherein the demulsifier comprises the following components in percentage by weight: polyoxyethylene ether: 10 to 15 percent; polyethylene polyamine ethers: 12 to 18 percent; alcohol (C < 3): 20 to 25 percent; citric acid: 4 to 10 percent; sodium chloride: 10 to 14 percent; the balance of water, and the preparation method of the demulsifier comprises the following steps: 1) Adding 10-15% of alcohol into a reaction kettle, adding polyvinyl polyamine ether while stirring, and stirring for 20-30 minutes; 2) Sequentially adding polyoxyethylene ether, sodium chloride, citric acid and the rest alcohol, heating to 40-60 ℃, and continuously stirring for 15-30 minutes; 3) Finally, adding water and cooling to normal temperature. The dehydration demulsifying agent disclosed by the invention is simple in component, is used for rapid dehydration demulsification of condensate oil after acid fracturing, and has the water content of less than 0.5wt% after the condensate oil is dehydrated under the condition that the addition amount is 30-50 mg/L.
The crude oil dehydration method commonly used in various oil fields at present comprises an electrochemical dehydration method, a heating sedimentation method, a filtration method and the like. However, the methods can only remove the export crude oil to the water content of about 0.5wt%. At present, the large-tank settling dehydration method widely adopted in each large oil field can only remove the water content of the crude oil to 0.3wt% through the measures of combining heating and settling time prolonging. However, in the actual production process, particularly in the desert in the wide range of Xinjiang, the difference between day and night of the environmental temperature is large, the pipelines fluctuate along with the falling of the desert, water is extremely easy to accumulate in the low-lying part in the crude oil gathering and transportation process, the gathering and transportation pipelines are leaked, and frequent perforation occurs, so that the problems of leakage loss of a large amount of crude oil and condensate, serious environmental pollution, large emergency cost investment and the like are caused. In the engineering of 'stability and storage and transportation of condensate oil in tower', the water content of the export crude oil needs to be reduced to below 0.1wt% according to the dehydration test report, so that the problem of frequent puncture and leakage of the gathering and transportation pipeline can be fundamentally solved.
At present, the water content of crude oil can only be dehydrated to about 0.5wt% by the existing dehydration method, and when the water content of the crude oil is 0.5wt%, the crude oil is in a water-in-oil state, and the conventional dehydration method is difficult to realize in order to further reduce the water content and improve the dehydration depth. Therefore, it is necessary to develop a new crude oil dehydration technology to further deeply dehydrate the crude oil to reduce the water content of the crude oil from 0.5wt% to less than 0.1wt%.
Disclosure of Invention
To address the above-described shortcomings and drawbacks, it is an object of the present invention to provide a distributor.
The invention also aims to provide an oil product dehydration device.
Still another object of the present invention is to provide an oil dewatering system.
Still another object of the present invention is to provide a method for dehydrating an oil product.
The invention provides an oil product dehydration technology which has the advantages of simple structure, easy design and processing, stable and reliable operation, high dehydration depth and strong adaptability and is based on the principle of physical sedimentation by fully utilizing the density difference of oil products (such as crude oil or condensate oil) and water. The invention has the advantages that the heating is not needed, the physical sedimentation mode is only adopted for dehydration, the equipment installation is convenient, and the purposes of saving energy, protecting environment, saving engineering investment and saving operation and maintenance cost can be achieved while the deep dehydration of the oil product can be realized.
In order to achieve the above objects, in one aspect, the present invention provides a distributor, wherein the distributor comprises dispersing tubes connected end to form a closed loop, and a cross conduit disposed in the closed loop, and an open end of the cross conduit is disposed at a cross point of the cross conduit, so that a sample to be processed can enter the dispersing tubes through the cross conduit through the open end; the inclined lower side of a closed loop formed by connecting the head and the tail of the dispersion pipes is provided with a plurality of small holes.
The shape of the closed loop formed by connecting the dispersion pipes end to end is not particularly required, and the shape of the closed loop can be reasonably set by a person skilled in the art according to the field operation needs, such as the shape of a dewatering tank. In an embodiment of the above distributor of the present invention, the dispersion pipes are connected end to form a circular closed loop.
The angle formed between the crossed conduits is not particularly required by the invention, and the angle can be reasonably set by a person skilled in the art according to the operation requirement as long as the aim of the invention can be realized. In an embodiment of the above distributor of the present invention, the cross conduit is a cross conduit.
In a specific embodiment of the above distributor of the present invention, the dispersion pipe is a flexible metal hose.
In the invention, a certain number of small holes are arranged on the inclined lower side of the dispersion pipe according to the properties of oil products, so that the feeding is optimized to be a plurality of small flows from a conventional large flow, the oil products pass through the small holes on the dispersion pipe, and like a shower head, the oil products generally slowly enter the dehydration tank along the periphery of the wall of the dehydration tank, thereby reducing the disturbance of the inlet liquid, promoting the oil-water stratification and improving the water diversion effect.
In an embodiment of the above distributor according to the present invention, the open end of the cross conduit may be disposed at an upper portion of the cross conduit, or may be disposed at a lower portion of the cross conduit.
On the other hand, the invention also provides an oil product dehydration device which comprises a dehydration tank, wherein the distributor is arranged at the bottom of the dehydration tank, and a liquid inlet pipeline of the dehydration tank is connected with the opening end of the cross conduit of the distributor.
As a specific implementation mode of the oil product dehydration device, the distributor and the dehydration tank liquid inlet pipeline can be connected by flanges, so that the disassembly is convenient, and the reconstruction and implementation of the built large tank (dehydration tank) are also convenient.
Wherein, in the working process, the dehydration tank is divided into an oil storage area, a dehydration area and a dehydration settlement area from top to bottom in sequence.
As a specific embodiment of the above oil product dehydration device of the present invention, the oil outlet line of the dehydration tank is disposed above the dehydration zone of the dehydration tank;
the liquid inlet pipeline of the dewatering tank is higher than the height of the dewatering settling zone of the dewatering tank. And technicians in the field can reasonably set the specific heights of the oil outlet pipeline and the liquid inlet pipeline of the dehydration tank according to the actual operation requirements on site, such as the property of oil products to be treated, and the like, as long as the oil outlet pipeline of the dehydration tank is arranged above the dehydration area of the dehydration tank; the liquid inlet pipeline of the dewatering tank is higher than the dewatering settling zone of the dewatering tank.
According to the invention, the oil outlet pipeline is heightened, so that the liquid level height of the outlet of the dehydration tank can be improved, the influence of fluctuation of the liquid levels of the inlet and the outlet is reduced, and a stable field can be provided for dehydration; in addition, the invention can reasonably increase the height of the oil outlet pipeline according to the requirement of dehydration time.
As a specific embodiment of the oil product dehydration device of the present invention, a funnel-shaped diversion opening is disposed at an outlet end of the oil outlet line.
As a specific embodiment of the above oil product dehydration device of the present invention, the oil product dehydration device includes a support device for supporting the distributor.
As a specific embodiment of the above oil product dehydration device of the present invention, the water outlet pipeline of the dehydration tank is connected to an automatic water cutting device.
In the invention, in order to conveniently discharge the water precipitated at the bottom of the dehydration tank in time, the automatic water cutting device (conventional equipment) is arranged at the bottom of the dehydration tank, so that the automation degree of the process is improved, and the investment of labor cost is reduced.
As a specific embodiment of the above oil product dehydration device of the present invention, the dehydration tank is a spherical tank.
As a specific embodiment of the above oil product dehydration device of the present invention, the oil product includes crude oil and/or condensate oil.
In the invention, the distributor is arranged at the bottom in the dehydration tank body, so that additional land occupation is not needed, and the field operation space is saved.
In another aspect, the invention further provides a dewatering system, wherein the oil product dewatering system comprises more than two oil product dewatering devices, and the two oil product dewatering devices are connected in series.
In another aspect, the present invention further provides an oil product dehydration method, wherein the oil product dehydration method is implemented by using the oil product dehydration apparatus described above, and includes the following steps:
closing a valve on an oil outlet pipeline of the dehydration tank, so that the oil product enters the cross guide pipe through the opening end of the cross guide pipe of the distributor and then enters the dispersion pipe; oil products slowly enter the dehydration tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the dehydration tank and are subjected to sedimentation separation in the dehydration tank;
when the liquid level of the oil product reaches the design liquid level of the dehydration tank, closing a valve on a liquid inlet pipeline of the dehydration tank, and opening a valve on an oil outlet pipeline of the dehydration tank to start outputting the separated oil product; the water settled and separated at the bottom of the tank is discharged out of the dehydration tank through a water outlet pipeline.
In a specific embodiment of the oil product dewatering method according to the present invention, the water settled and separated at the bottom of the dewatering tank is discharged through the water outlet pipeline and then enters the automatic water cutting device, and the sewage and the dirty oil are separated in the automatic water cutting device and are respectively discharged for treatment.
In another aspect, the present invention further provides an oil product dehydration method, wherein the oil product dehydration method is implemented by using the oil product dehydration system, and includes the following steps:
two sets of oil product dehydration devices are adopted to alternately perform oil product dehydration, namely, when one set of oil product dehydration device performs oil product dehydration, the other set of oil product dehydration device receives the oil product after sedimentation separation.
As a specific embodiment of the above oil product dehydration method of the present invention, the method specifically includes:
when the first oil product dehydration device is used for oil product dehydration, a valve on an oil outlet pipeline of a first dehydration tank in the first oil product dehydration device is closed, so that the oil product enters a cross guide pipe through the opening end of a distributor cross guide pipe and then enters a dispersion pipe; oil slowly enters the first dewatering tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the first dewatering tank and is subjected to sedimentation separation in the first dewatering tank;
when the liquid level of the oil product reaches the design liquid level of the first dehydration tank, closing a valve on a liquid inlet pipeline of the first dehydration tank, opening a valve on an oil outlet pipeline of the first dehydration tank, and conveying the separated oil product to a second dehydration tank in a second oil product dehydration device; the water settled and separated at the bottom of the first dehydration tank is discharged out of the first dehydration tank through a water outlet pipeline;
when the second oil product dehydration device is used for oil product dehydration, a valve on an oil outlet pipeline of a second dehydration tank in the second oil product dehydration device is closed, so that the oil product enters the cross guide pipe through the opening end of the distributor cross guide pipe and then enters the dispersion pipe; oil products slowly enter the second dewatering tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the second dewatering tank and are subjected to sedimentation separation in the second dewatering tank;
when the liquid level of the oil product reaches the design liquid level of the second dehydration tank, closing a valve on a liquid inlet pipeline of the second dehydration tank, opening a valve on an oil outlet pipeline of the second dehydration tank, and conveying the separated oil product to a first dehydration tank in the first oil product dehydration device; and water settled and separated at the bottom of the second dehydration tank is discharged out of the second dehydration tank through a water outlet pipeline.
As a specific embodiment of the oil product dehydration method, the water settled and separated at the bottom of the first dehydration tank and the second dehydration tank enters the automatic water cutting device after being discharged through the water outlet pipeline, and is separated in the automatic water cutting device to obtain sewage and dirty oil which are respectively discharged and treated.
In the invention, two sets of oil product dehydration devices are arranged for dynamic alternate sedimentation dehydration, so that the oil product dehydration sedimentation time can be saved, and the simultaneous oil receiving and dispatching operation can be realized.
Aiming at the problems that the water content of the prior oil field export crude oil is mostly about 0.5wt%, and the liquid is in a water-in-oil state at the moment, and further dehydration is difficult, the invention adopts the concepts of small feeding, slow feeding and establishment of a sufficient stable field, and is based on the large tank sedimentation dehydration theory, and only adopts a physical sedimentation dehydration mode to carry out deep dehydration on the oil product, so that the water content of the oil product after deep dehydration is less than 0.1wt%.
The technical scheme provided by the invention has the following advantages:
(1) The dehydration precision is high, the problem of great difficulty in dehydrating oil products in a water-in-oil state is solved, the water content of the oil products can be further dehydrated to be below 0.1wt% from 0.50wt%, and the water content of the dehydrated oil products can be even less than 0.05wt% in the current practical detection.
(2) Simple process, convenience, flexibility, convenient implementation and low one-time investment.
(3) The oil product is dehydrated by a physical sedimentation method, no extra consumption and investment are needed, and the energy-saving effect is obvious.
(4) The whole structure of the equipment has small size, and large tank volume is not consumed.
(5) The technology is convenient to operate, and additional operators are not required.
(6) The construction is convenient, the technical scheme can be adopted no matter a new large tank or an old tank is modified, and the method has wide application prospect in the field of oil product dehydration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a top view of a distributor provided in embodiment 1 of the present invention.
Fig. 2base:Sub>A isbase:Sub>A cross-sectional view ofbase:Sub>A distributorbase:Sub>A-base:Sub>A provided in example 1 of the present invention.
Fig. 2b is a schematic view of the orientation of the small holes formed on the inclined lower side of the circular dispersion pipe in the distributor according to embodiment 1 of the present invention.
Fig. 2c is a schematic view of a cross-shaped duct in the distributor provided in example 1 of the present invention (view in direction i of the distributor in fig. 1).
Figure 2d is a cross-sectional view of the sparger in figure 2a taken along the line C-C.
FIG. 3a is a schematic diagram showing the distribution of the liquid inlet line, the bottom water outlet line and the oil outlet line in the dewatering tank of the oil dewatering device in example 2 of the present invention.
Fig. 3b is a schematic view of a funnel-shaped diversion opening provided in embodiment 2 of the present invention.
FIG. 4 is a schematic flow chart of a crude oil dehydration method provided in example 4 of the present invention.
The main reference numbers illustrate:
1. distributor
11. A circular ring-shaped dispersion pipe;
12. a criss-cross conduit;
13. an open end;
2. a liquid inlet pipeline;
3. a tank bottom water outlet pipeline;
4. an oil outlet line;
5. a funnel-shaped flow guide opening;
6. a support device;
7. a dehydration tank;
8. an automatic water cutting device;
9. a recovered oil delivery pump.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the following specific examples in order to clearly understand the technical features, objects and advantages of the present invention, but the present invention should not be construed as being limited to the implementable scope of the present invention.
It should be noted that the term "comprises/comprising" and any variations thereof in the description and claims of this invention and the above-described drawings is intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present invention, the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meanings of these terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Furthermore, the terms "disposed" and "connected" should be interpreted broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Example 1
The present embodiment provides a distributor 1, the structural schematic diagram of which is shown in fig. 1 and fig. 2 a-fig. 2d, as can be seen from fig. 1 and fig. 2 a-fig. 2d, the distributor 1 includes a circular ring-shaped dispersion pipe 11 (i.e. the dispersion pipes are connected end to form a circular ring-shaped closed loop) and a cross conduit 12 (shown in fig. 2 c) disposed in the circular ring of the circular ring-shaped dispersion pipe 11, an open end 13 of the cross conduit 12 is disposed at the intersection of the cross conduit 12, so that a sample to be processed can enter the circular ring-shaped dispersion pipe 11 through the cross conduit 12 through the open end 13; a plurality of small holes (as shown in fig. 2 b) are formed on the inclined lower side of the circular ring-shaped dispersion pipe 11.
Wherein, the circular ring-shaped dispersion pipe is a flexible metal hose.
Example 2
This embodiment provides an oil dewatering device, including the drain sump, embodiment 1 the distributor set up in bottom in the drain sump, the liquid inlet pipeline of drain sump with the open end of distributor cross pipe links to each other. The schematic distribution diagram of the liquid inlet pipeline 2, the bottom water outlet pipeline 3 and the oil outlet pipeline 4 in the dewatering tank of the oil product dewatering device provided in this embodiment is shown in fig. 3 a.
In this embodiment, the oil outlet line 4 of the dewatering tank is arranged above the dewatering area of the dewatering tank; the liquid inlet pipeline of the dewatering tank is higher than the height of the dewatering settling zone of the dewatering tank.
In this embodiment, the outlet end of the flow line is provided with a funnel-shaped diversion opening 5 (as shown in fig. 3 b).
In this embodiment, the crude oil dehydration unit comprises a support device 6 for supporting the distributor.
In this embodiment, the outlet pipeline at the bottom of the dehydration tank is connected with an automatic water cutting device.
In this embodiment, the dehydration tank is a spherical tank.
Example 3
This embodiment provides an oil dewatering system, wherein, oil dewatering system includes two embodiment 2 oil dewatering device, and two oil dewatering device sets up in series.
Example 4
This embodiment provides a crude oil dehydration method, wherein the crude oil dehydration method is implemented by using the oil product dehydration apparatus described in embodiment 2, and the flowchart thereof is shown in fig. 4, and includes the following steps:
closing a valve on an oil outlet pipeline of the dehydration tank 7, so that the crude oil enters the cross guide pipe through the opening end of the cross guide pipe of the distributor and then enters the circular dispersion pipe; crude oil slowly enters the dehydration tank from a plurality of small holes formed in the inclined lower side of the circular dispersion pipe along the tank wall of the dehydration tank and is subjected to sedimentation separation in the dehydration tank;
when the liquid level of the crude oil reaches the design liquid level of the dehydration tank, closing a valve on a liquid inlet pipeline of the dehydration tank, opening a valve on an oil outlet pipeline of the dehydration tank, and starting to output the separated crude oil through a recovered oil delivery pump 9; the water settled and separated at the bottom of the tank is discharged out of the dehydration tank through a bottom water outlet pipeline.
In the embodiment, the water settled and separated at the bottom of the dehydration tank enters the automatic water cutting device 8 after being discharged through the water outlet pipeline at the bottom of the dehydration tank, and sewage and dirty oil are obtained by separation in the automatic water cutting device and are respectively discharged and treated.
In the crude oil dehydration process provided by the embodiment, the pressure in the dehydration tank 7 can be maintained by fuel gas.
Example 5
This example provides a crude oil dehydration method, wherein the crude oil dehydration method is implemented by using the oil product dehydration system of example 3, and comprises the following steps:
the two sets of oil product dehydration devices are adopted to alternately perform crude oil dehydration, namely, when one set of oil product dehydration device performs crude oil dehydration, the other set of oil product dehydration device receives the crude oil after sedimentation separation;
the method specifically comprises the following steps:
when the first crude oil dehydration device is used for dehydrating crude oil, a valve on an oil outlet pipeline of a first dehydration tank in the first crude oil dehydration device is closed, so that the crude oil enters a cross guide pipe through the opening end of a cross guide pipe of a distributor and then enters an annular dispersion pipe; crude oil slowly enters a first dewatering tank from a plurality of small holes formed in the inclined lower side of the circular dispersion pipe along the tank wall of the first dewatering tank and is subjected to sedimentation separation in the first dewatering tank;
when the liquid level of the crude oil reaches the design liquid level of the first dehydration tank, closing a valve on a liquid inlet pipeline of the first dehydration tank, opening a valve on an oil outlet pipeline of the first dehydration tank, and conveying the separated crude oil to a second dehydration tank in a second crude oil dehydration device; the water settled and separated at the bottom of the first dehydration tank is discharged out of the first dehydration tank through a bottom water outlet pipeline;
when the second crude oil dehydration device is used for crude oil dehydration, a valve on an oil outlet pipeline of a second dehydration tank in the second crude oil dehydration device is closed, so that crude oil enters the cross guide pipe through the opening end of the cross guide pipe of the distributor and then enters the annular dispersion pipe; crude oil slowly enters a second dewatering tank from a plurality of small holes formed in the inclined lower side of the circular dispersion pipe along the tank wall of the second dewatering tank and is subjected to sedimentation separation in the second dewatering tank;
when the liquid level of the crude oil reaches the design liquid level of the second dehydration tank, closing a valve on a liquid inlet pipeline of the second dehydration tank, opening a valve on an oil outlet pipeline of the second dehydration tank, and conveying the separated crude oil to a first dehydration tank in the first crude oil dehydration device; and water settled and separated at the bottom of the second dehydration tank is discharged out of the second dehydration tank through a bottom water outlet pipeline.
In this embodiment, the water settled and separated at the bottom of the first and second dehydration tanks enters the automatic water-cutting device after being discharged through the tank bottom water outlet pipeline, and is separated in the automatic water-cutting device to obtain sewage and dirty oil which are respectively discharged and treated.
The oil product used in the embodiments 4 to 5 of the present invention is the condensate oil in the tower (the water content is 0.5 wt%), and after the condensate oil in the tower is dehydrated by the methods provided in the embodiments 4 and 5 of the present invention, the average water content of the condensate oil is 0.03wt%, so that the dehydration effect is significant. In addition, the yield of the condensate oil in the area in the tower is increased year by year, the fluctuation of the water content is large, and the method provided by the invention can adapt to the condition that the fluctuation of the water content of the oil product is large.
In conclusion, the device, the system and the method provided by the embodiment of the invention adopt the concept of small feeding, slow feeding and establishment of a sufficient stable field, and are based on the theory of large-tank sedimentation dehydration, and deep dehydration is performed on crude oil with water content of mostly about 0.5wt% and liquid in a water-in-oil state only by adopting a physical sedimentation dehydration mode, so that the water content of the crude oil after deep dehydration is less than 0.1wt%.
The technical scheme provided by the embodiment of the invention has the following advantages:
(1) The dehydration precision is high, the problem of great difficulty in dehydrating crude oil in a water-in-oil state is solved, the water content of the crude oil can be further dehydrated to be below 0.1wt% from 0.50wt%, and the water content of the dehydrated crude oil can be even lower than 0.05wt% in the current actual detection.
(2) Simple process, convenience, flexibility, convenient implementation and low one-time investment.
(3) The physical sedimentation method is used for crude oil dehydration, no additional consumption and investment are needed, and the energy-saving effect is obvious.
(4) The whole structure of the equipment has small size, and large tank volume is not consumed.
(5) The technology is convenient to operate, and additional operators are not required.
(6) The construction is convenient, the technical scheme can be adopted no matter a new large tank or an old tank is reconstructed, and the method has wide application prospect in the field of crude oil dehydration.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (17)
1. A distributor, which is characterized in that the distributor comprises a dispersion pipe and a cross conduit, wherein the dispersion pipe is connected end to form a closed loop, the cross conduit is arranged in the closed loop, and the open end of the cross conduit is arranged at the cross point of the cross conduit, so that a sample to be processed can enter the dispersion pipe through the cross conduit through the open end; the inclined lower side of a closed loop formed by connecting the head and the tail of the dispersion pipes is provided with a plurality of small holes.
2. The distributor of claim 1, wherein the dispersion tubes are connected end to form a circular closed loop.
3. The distributor of claim 1, wherein the cross-over conduit is a cross-over conduit.
4. A distributor according to any of claims 1 to 3, wherein the dispersion tubes are flexible metal hoses.
5. An oil product dewatering device, comprising a dewatering tank, wherein the distributor in any one of claims 1-4 is arranged at the bottom of the dewatering tank, and a liquid inlet pipeline of the dewatering tank is connected with the open ends of the cross guide pipes of the distributor.
6. The oil product dehydration plant of claim 5 characterized in that the oil line of the dehydration tank is placed above the dehydration zone of the dehydration tank; the liquid inlet pipeline of the dehydration tank is higher than the dehydration settling zone of the dehydration tank.
7. The oil product dewatering device of claim 6, wherein the outlet end of the flowline is provided with a funnel-shaped flow-directing orifice.
8. An oil dehydration apparatus according to claim 5 or 6, characterized in that it comprises a support device to support the distributor.
9. An oil product dehydration device according to claim 5 or 6 characterized in that the water outlet pipeline of the dehydration tank is connected with an automatic water cut-off device.
10. An oil product dewatering device according to claim 5 or 6, characterized in that the dewatering tank is a spherical tank.
11. An oil dehydration device according to claim 5 or 6 characterized in that said oil comprises crude oil and/or condensate.
12. An oil product dewatering system, characterized in that the oil product dewatering system comprises two oil product dewatering devices according to any one of claims 5-11, and the two oil product dewatering devices are arranged in series.
13. An oil dehydration method, characterized in that it is implemented by using an oil dehydration apparatus according to any of claims 5 to 11, comprising the steps of:
closing a valve on an oil outlet pipeline of the dehydration tank, so that the oil enters the cross guide pipe through the opening end of the cross guide pipe of the distributor and then enters the dispersion pipe; oil products slowly enter the dehydration tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the dehydration tank and are subjected to sedimentation separation in the dehydration tank;
when the liquid level of the oil product reaches the design liquid level of the dehydration tank, closing a valve on a liquid inlet pipeline of the dehydration tank, and opening a valve on an oil outlet pipeline of the dehydration tank to start outputting the separated oil product; the water settled and separated at the bottom of the tank is discharged out of the dehydration tank through a water outlet pipeline.
14. The oil product dehydration method of claim 13, characterized in that the water settled and separated at the bottom of the dehydration tank enters into the automatic water-cutting device after being discharged through the water outlet pipeline, and sewage and dirty oil are separated in the automatic water-cutting device and are discharged and treated respectively.
15. An oil dehydration method, characterized in that it is implemented by the oil dehydration system of claim 12, comprising the steps of:
two sets of oil product dehydration devices are adopted to alternately perform oil product dehydration, namely, when one set of oil product dehydration device performs oil product dehydration, the other set of oil product dehydration device receives the oil product after sedimentation separation.
16. An oil dehydration method according to claim 15, characterized in that it comprises in particular:
when the first oil product dehydration device is used for oil product dehydration, a valve on an oil outlet pipeline of a first dehydration tank in the first oil product dehydration device is closed, so that the oil product enters a cross guide pipe through the opening end of a distributor cross guide pipe and then enters a dispersion pipe; oil products slowly enter the first dewatering tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the first dewatering tank and are subjected to sedimentation separation in the first dewatering tank;
when the liquid level of the oil product reaches the designed liquid level of the first dehydration tank, closing a valve on a liquid inlet pipeline of the first dehydration tank, opening a valve on an oil outlet pipeline of the first dehydration tank, and conveying the separated oil product to a second dehydration tank in a second oil product dehydration device; the water settled and separated at the bottom of the first dehydration tank is discharged out of the first dehydration tank through a water outlet pipeline;
when the second oil product dehydration device is used for oil product dehydration, a valve on an oil outlet pipeline of a second dehydration tank in the second oil product dehydration device is closed, so that the oil product enters the cross guide pipe through the opening end of the distributor cross guide pipe and then enters the dispersion pipe; oil products slowly enter the second dewatering tank from a plurality of small holes formed in the inclined lower side of the dispersion pipe along the tank wall of the second dewatering tank and are subjected to sedimentation separation in the second dewatering tank;
when the liquid level of the oil product reaches the design liquid level of the second dehydration tank, closing a valve on a liquid inlet pipeline of the second dehydration tank, opening a valve on an oil outlet pipeline of the second dehydration tank, and conveying the separated oil product to a first dehydration tank in the first oil product dehydration device; and water settled and separated at the bottom of the second dehydration tank is discharged out of the second dehydration tank through a water outlet pipeline.
17. The oil product dehydration method of claim 15 or 16, characterized in that the water settled and separated at the bottom of the first dehydration tank and the second dehydration tank is discharged through the water outlet pipeline and then enters the automatic water cutter, and the sewage and the dirty oil are separated in the automatic water cutter and are discharged and treated respectively.
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