CN115161069A - A distributor, oil dehydration device, oil dehydration system and method - Google Patents

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

A distributor, oil dehydration device, oil dehydration system and method

technical field

The invention relates to a distributor, an oil dehydration device, an oil dehydration system and a method, and belongs to the technical field of oil dehydration.

Background technique

The crude oil produced from the well generally contains a certain amount of water, and if the crude oil contains too much water, it will cause waste in storage and transportation, increase equipment, and consume more energy; most of the water in crude oil contains salts, which accelerates the production of equipment, containers and pipelines. Corrosion; in the oil refining process, when water and crude oil are heated together, the water will rapidly vaporize and expand, and the pressure will rise, affecting the normal operation of the refinery and product quality, and even explosion. Therefore, before exporting crude oil, it needs to be dehydrated so that the water content does not exceed 0.5wt%.

All oilfields have to go through a water-cut development period, especially for oilfields with high oil production rate and enhanced development by water injection, the water-free oil production period is generally short, the oil well breaks through early, and the water content of crude oil increases rapidly. Crude oil containing water not only increases the load of equipment during storage, transportation and refining, but also increases fuel consumption during heating, and even causes scaling or corrosion of equipment and pipelines due to salt in the water. Therefore, the water content of crude oil has all the harm and no benefit. However, in the process of oilfield development, water is almost the "permanent companion" of crude oil, especially in the middle and late stages of oilfield development, when oil wells do not produce water, there is no oil. Therefore, the dehydration of crude oil has become an indispensable link in the process of oilfield development, and it has always been paid attention by people.

The SAGD airtight dehydration test station in Xinjiang Fengcheng Oilfield analyzed the properties and product requirements of SAGD produced fluids, and optimized the plan of relying on Fengcheng No. 1 heavy oil combined station to use large tank sedimentation for treatment. The operating temperature of the purified oil tank is At 160°C, the operating pressure is 101.3KPa, the residence time is 48h, and the water content of the effluent is 1.5wt%.

Chinese patent CN103980933B discloses a demulsifier for rapid dehydration of condensate after acid pressing and a preparation method, wherein the demulsifier includes the following components by weight: polyoxyethylene ether: 10-15%; Amine ether: 12-18%; alcohol (C<3): 20-25%; citric acid: 4-10%; sodium chloride: 10-14%; the rest is water, and the preparation method of the demulsifier includes: 1) add 10-15% alcohol to the reaction kettle, add polyvinyl polyamine ether while stirring, and stir for 20-30 minutes; 2) add polyoxyethylene ether, sodium chloride, citric acid and remaining alcohol successively, Heat to 40-60°C and continue stirring for 15-30 minutes; 3) Finally add water and cool to room temperature. The dehydrating demulsifier of the invention has simple components and is used for rapid dehydration and demulsification of the condensate after acid pressing. When the added amount is 30-50 mg/L, the water content of the condensate after dehydration is less than 0.5wt%.

At present, the commonly used crude oil dehydration methods in major oil fields include electrochemical dehydration method, heating sedimentation method, filtration method and so on. However, the above methods can only remove the crude oil to a water content of about 0.5wt%. At present, the large-tank sedimentation and dehydration method, which is widely used in major oil fields, can only reduce the water content of crude oil to 0.3wt% through the combination of heating and prolonging the sedimentation time. However, in the actual production process, especially in the vast deserts of Xinjiang, the ambient temperature varies greatly between day and night, and the pipelines fluctuate with the desert. The puncture and leakage of the pipeline and frequent perforation have caused problems such as a large amount of crude oil and condensate leakage losses, serious environmental pollution, and a large amount of emergency rescue costs. In the "Tazhong Condensate Stabilization, Storage and Transportation" project in Tarim Oilfield, Xinjiang, according to the dehydration test report, it is necessary to reduce the water content of the exported crude oil to less than 0.1wt% in order to fundamentally solve the problem of frequent puncture leakage in the gathering and transportation pipeline. question.

At present, the existing dehydration method can only remove the water content of crude oil to about 0.5wt%, and when the water content of crude oil is 0.5wt%, the crude oil is in a "water-in-oil" state. To further reduce the water content and increase the depth of dehydration, conventional Dehydration methods are difficult to achieve. Therefore, it is necessary to develop a new crude oil dehydration technology to further dehydrate the crude oil to reduce the water content of the crude oil from 0.5wt% to below 0.1wt%.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned shortcomings and deficiencies, an object of the present invention is to provide a distributor.

Another object of the present invention is to provide an oil dehydration device.

Another object of the present invention is to provide an oil dehydration system.

Another object of the present invention is to provide a method for dehydrating oil products.

The invention makes full use of the density difference between oil (such as crude oil or condensate) and water, and based on the principle of physical sedimentation, proposes an oil with simple structure, easy design and processing, stable and reliable operation, high dehydration depth and strong adaptability Dehydration technology. The advantage of the present invention is that it does not need to be heated, but only uses physical sedimentation for dehydration, the equipment is easy to install, and while deep dehydration of oil products can be achieved, the purpose of energy saving, environmental protection, engineering investment and operation and maintenance cost can be saved.

In order to achieve the above object, in one aspect, the present invention provides a distributor, wherein the distributor comprises a dispersing pipe and a cross conduit, the dispersing pipes are connected end to end to form a closed circuit, and the cross conduit is arranged in the closed loop. In the loop, the open end of the cross conduit is arranged at the intersection of the cross conduit, so that the sample to be processed can enter the dispersion pipe through the open end through the cross conduit; the closed loop formed by the end-to-end connection of the dispersion pipes is formed. A number of small holes are opened on the oblique lower side.

The present invention has no specific requirements on the shape of the closed loop formed by the end-to-end connection of the dispersing pipes, and those skilled in the art can reasonably set the shape of the closed loop according to the needs of field operations, such as the shape of the dehydration tank. As a specific embodiment of the above distributor of the present invention, wherein, the dispersing pipes are connected end to end to form a circular closed loop.

The present invention does not make specific requirements on the angle formed between the intersecting conduits, and those skilled in the art can reasonably set the angle according to operational needs, as long as the purpose of the present invention can be achieved. As a specific embodiment of the above-mentioned distributor of the present invention, the cross conduit is a crisscross conduit.

As a specific embodiment of the above-mentioned distributor of the present invention, the dispersion pipe is a flexible metal hose.

In the present invention, those skilled in the art can open a certain number of small holes on the oblique lower side of the dispersing pipe according to the properties of the oil, so that the feed is optimized from a conventional large flow to many small flows, and the oil is on the dispersing pipe. Passing through the small holes, such as a "shower", slowly enters the dehydration tank along the wall of the dehydration tank, so as to reduce the disturbance of the liquid inlet, promote the oil-water stratification, and improve the water separation effect.

As a specific embodiment of the above-mentioned distributor of the present invention, the open end of the cross-conduit can be arranged on the upper part of the cross-duct, and can also be arranged on the lower part of the cross-duct.

On the other hand, the present invention also provides an oil dehydration device, including a dehydration tank, wherein the distributor described above is arranged at the bottom of the dehydration tank, and the liquid inlet line of the dehydration tank is connected to the distributor. The open ends of the crossover conduits are connected.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, a flange connection can be used between the distributor and the liquid inlet line of the dehydration tank, which is convenient for disassembly and reconstruction of the existing large tank (dehydration tank).

Among them, during the working process, the dehydration tank is divided into oil storage area, dehydration area and dehydration sedimentation area in turn from top to bottom.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, wherein, the oil outlet pipeline of the dehydration tank is arranged above the dehydration area of the dehydration tank;

The height of the liquid inlet line of the dehydration tank is higher than the height of the dehydration settling zone of the dehydration tank. And those skilled in the art can reasonably set the specific height of the oil outlet pipeline and the liquid inlet pipeline of the dehydration tank according to the actual operation needs on site, such as the properties of the oil to be treated, as long as it is ensured that the oil outlet pipeline of the dehydration tank is set in the dehydration tank of the dehydration tank. The height of the liquid inlet pipeline of the dehydration tank may be higher than the height of the dehydration sedimentation area of the dehydration tank.

In the present invention, the height of the oil outlet pipeline can increase the height of the liquid level at the outlet of the dehydration tank, reduce the influence of the fluctuation of the liquid level at the inlet and outlet, and then provide a stable field for dehydration; in addition, according to the requirements of the dehydration time, the present invention can reasonably increase the height of the outlet. Oil line height.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, the outlet end of the oil outlet line is provided with a funnel-shaped diversion port.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, the oil dehydration device includes a supporting device for supporting the distributor.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, an automatic water cutter is connected to the water outlet pipeline of the dehydration tank.

In the present invention, in order to facilitate the timely discharge of the water precipitated at the bottom of the dehydration tank, an automatic water cutter (conventional equipment) is arranged at the bottom of the dehydration tank to improve the automation degree of the process and reduce the input of labor costs.

As a specific embodiment of the above oil dehydration device of the present invention, the dehydration tank is a spherical tank.

As a specific embodiment of the above-mentioned oil dehydration device of the present invention, the oil product includes crude oil and/or condensate oil.

In the present invention, the distributor is arranged at the bottom of the tank body of the dehydration tank, which does not require additional land occupation and saves on-site operation space.

In another aspect, the present invention also provides a dehydration system, wherein the oil dehydration system includes two or more of the oil dehydration devices, and the two oil dehydration devices are arranged in series.

In another aspect, the present invention also provides an oil dehydration method, wherein the oil dehydration method is realized by using the above-mentioned oil dehydration device, which comprises the following steps:

Close the valve on the oil outlet line of the dehydration tank, so that the oil product enters the cross catheter through the open end of the cross pipe of the distributor and then enters the dispersing pipe; the oil products are opened from the oblique lower side of the dispersing pipe. Several small holes along the tank wall of the dehydration tank Slowly enter the dehydration tank and carry out sedimentation separation in the dehydration tank;

When the oil level reaches the design level of the dehydration tank, close the valve on the inlet line of the dehydration tank, and open the valve on the outlet line of the dehydration tank to start exporting the separated oil; the water separated from the bottom of the tank will pass through the outlet line. Drain the dehydration tank.

As a specific embodiment of the above-mentioned oil dehydration method of the present invention, wherein, the water separated by sedimentation at the bottom of the dehydration tank is discharged through the water outlet pipeline and then enters the automatic water cutter, where the sewage and dirty oil are separated in the automatic water cutter. Dispose of separately.

In another aspect, the present invention also provides a method for dehydrating oil products, wherein the method for dehydrating oil products is realized by using the above-mentioned oil dehydration system, which includes the following steps:

Two sets of oil dehydration devices are used for oil dehydration alternately, that is, when one set of oil dehydration device is used for oil dehydration, the other set of oil dehydration device receives the oil after sedimentation and separation.

As a specific embodiment of the above-mentioned oil dehydration method of the present invention, the method specifically includes:

When the first oil dehydration device is used for oil dehydration, close the valve on the oil outlet line of the first dehydration tank in the first oil dehydration device, so that the oil enters the cross conduit through the open end of the cross conduit of the distributor and then enters the dispersion. Pipe; oil products slowly enter the first dehydration tank along the tank wall of the first dehydration tank from a number of small holes opened on the oblique lower side of the dispersion pipe, and carry out sedimentation and separation in the first dehydration tank;

When the oil level reaches the design level of the first dehydration tank, close the valve on the inlet line of the first dehydration tank, open the valve on the outlet line of the first dehydration tank, and start to transport the separated oil to the second oil. The second dehydration tank in the dehydration device; the water separated by the bottom of the first dehydration tank is discharged from the first dehydration tank through the water outlet pipeline;

When the second oil dehydration device is used for oil dehydration, close the valve on the oil outlet line of the second dehydration tank in the second oil dehydration device, so that the oil enters the cross conduit through the open end of the cross conduit of the distributor and then enters the dispersion. Pipe; oil products slowly enter the second dehydration tank along the tank wall of the second dehydration tank from several small holes opened on the oblique lower side of the dispersion pipe, and carry out sedimentation and separation in the second dehydration tank;

When the oil level reaches the design level of the second dehydration tank, close the valve on the inlet line of the second dehydration tank, open the valve on the outlet line of the second dehydration tank, and start to transport the separated oil to the first oil. The first dehydration tank in the product dehydration device; the water settled and separated at the bottom of the second dehydration tank is discharged from the second dehydration tank through the water outlet pipeline.

As a specific embodiment of the above-mentioned oil dehydration method of the present invention, wherein the water separated by 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 then enters the automatic water cutter. The sewage and dirty oil are separated and discharged for treatment respectively.

In the present invention, two sets of oil dehydration devices are arranged to perform dynamic alternate sedimentation and dehydration, which can save the oil dehydration sedimentation time and simultaneously realize the operation of sending and receiving oil at the same time.

Aiming at the problem that the water content of the crude oil exported from the oil field is mostly about 0.5wt%, and the liquid is in the state of "water in oil" at this time, further dehydration is difficult. Based on the concept of large-tank sedimentation and dehydration, only the method of physical sedimentation and dehydration is used for deep dehydration of oil products, so that the water content of oil products after deep dehydration can be less than 0.1wt%.

The technical scheme provided by the present invention has the following advantages:

(1) High dehydration accuracy, overcoming the difficulty of dehydration of oil products in the "water-in-oil" state, and the water content of oil products can be further removed from 0.50wt% to less than 0.1wt%. The moisture content may even be less than 0.05 wt%.

(2) The process is simple, convenient and flexible, easy to implement, and less one-time investment.

(3) Oil dehydration is carried out by physical sedimentation method, without additional consumption and investment, and the energy saving effect is remarkable.

(4) The overall structure of the equipment is small in size and does not consume the volume of the large tank.

(5) The technology is easy to operate without adding additional operators.

(6) It is convenient for construction, whether it is a new large tank or an old tank renovation, this technical solution can be used, and it has a wide application prospect in the field of oil dehydration.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a top view of the distributor provided in Embodiment 1 of the present invention.

FIG. 2a is a cross-sectional view of the distributor provided in Embodiment 1 of the present invention along the line A-A.

Fig. 2b is a schematic diagram showing the orientation of the small holes opened on the oblique lower side of the annular dispersion pipe in the distributor provided in Embodiment 1 of the present invention.

Fig. 2c is a schematic diagram of the crisscross conduits in the distributor provided in Embodiment 1 of the present invention (a view from the direction I of the distributor in Fig. 1).

Figure 2d is a C-C cross-sectional view of the distributor in Figure 2a.

3a is a schematic diagram of the distribution of the liquid inlet pipeline, the tank bottom water outlet pipeline and the oil outlet pipeline in the dehydration tank of the oil product dehydration device in Example 2 of the present invention.

Fig. 3b is a schematic diagram of a funnel-shaped diversion port provided in Embodiment 2 of the present invention.

FIG. 4 is a schematic flowchart of the crude oil dehydration method provided in Example 4 of the present invention.

Description of main symbols:

1. Distributor

11. Circular dispersing pipe;

12. Cross conduit;

13. Open end;

2. Inlet pipeline;

3. The water outlet pipeline at the bottom of the tank;

4. Oil outlet pipeline;

5. Funnel-shaped diversion port;

6. Supporting equipment;

7. Dehydration tank;

8. Automatic water cutter;

9. Oil recovery pump.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solutions of the present invention are now described in detail below with reference to the following specific examples, but should not be construed as limiting the scope of the present invention.

It should be noted that the term "comprising" in the description and claims of the present invention and the above-mentioned drawings and any modifications thereof are intended to cover non-exclusive inclusion, for example, a process, method, method including a series of steps or units. A system, product or device is not necessarily limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to the process, method, product or device.

In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer" and the like is based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe the invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "arranged", "connected" should be construed broadly. For example, "connection" may be a fixed connection, a detachable connection, or a unitary construction; it may be a mechanical connection, or an electrical connection; it may be a direct connection, or an indirect connection through an intermediary, or two devices, elements or Internal connectivity between components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Example 1

This embodiment provides a distributor 1, the schematic diagram of which is shown in FIG. 1 and FIG. 2a-FIG. 2d. It can be seen from FIG. 1 and FIG. 2a-FIG. 2d that the distributor 1 includes a circular dispersion The pipe 11 (that is, the dispersion pipes are connected end to end to form an annular closed loop) and the crisscross conduit 12 (as shown in FIG. 2 c ) arranged in the ring of the annular dispersion pipe 11 The open end 13 is arranged at the intersection of the cross conduit 12, so that the sample to be processed can enter the annular dispersion tube 11 through the open end 13 through the cross conduit 12; A number of small holes are opened on the oblique lower side (as shown in Figure 2b).

Wherein, the annular dispersion pipe is a flexible metal hose.

Example 2

This embodiment provides an oil dehydration device, including a dehydration tank. The distributor described in Embodiment 1 is arranged at the inner bottom of the dehydration tank, and the liquid inlet line of the dehydration tank and the cross-crossing conduit of the distributor are connected to each other. The open ends are connected. Figure 3a shows a schematic diagram of the distribution of the liquid inlet pipeline 2, the tank bottom water outlet pipeline 3 and the oil outlet pipeline 4 in the dehydration tank of the oil dehydration device provided in this embodiment.

In this embodiment, the oil outlet line 4 of the dehydration tank is set above the dehydration area of the dehydration tank; the height of the liquid inlet line of the dehydration tank is higher than the height of the dehydration settling area of the dehydration tank.

In this embodiment, the outlet end of the oil outlet line is provided with a funnel-shaped diversion port 5 (as shown in FIG. 3b ).

In this embodiment, the crude oil dehydration device includes a supporting device 6 for supporting the distributor.

In this embodiment, the water outlet pipeline at the bottom of the dehydration tank is connected with an automatic water cutter.

In this embodiment, the dehydration tank is a spherical tank.

Example 3

This embodiment provides an oil dehydration system, wherein the oil dehydration system includes two oil dehydration devices described in Embodiment 2, and the two oil dehydration devices are arranged in series.

Example 4

This embodiment provides a crude oil dehydration method, wherein the crude oil dehydration method is realized by using the oil dehydration device described in Embodiment 2, and the flow chart of the method is shown in FIG. 4 , including the following steps:

Close the valve on the oil outlet line of the dehydration tank 7, so that the crude oil enters the cruciform conduit through the open end of the cross conduit of the distributor and then enters the annular dispersing pipe; the crude oil is opened from several small holes on the oblique lower side of the annular dispersing pipe Slowly enter the dehydration tank along the dehydration tank wall and carry out sedimentation separation in the dehydration tank;

When the crude oil level reaches the design level of the dehydration tank, close the valve on the inlet line of the dehydration tank, open the valve on the outlet line of the dehydration tank, and start to transport the separated crude oil through the recovery oil delivery pump 9; The water is discharged from the dehydration tank through the bottom outlet line.

In this embodiment, the water separated by sedimentation at the bottom of the dehydration tank is discharged through the water outlet pipeline at the bottom of the tank and then enters the automatic water cutter 8, where sewage and dirty oil are separated and discharged for treatment respectively.

During the crude oil dehydration process provided in this embodiment, the pressure in the dehydration tank 7 can be maintained by fuel gas.

Example 5

The present embodiment provides a crude oil dehydration method, wherein the crude oil dehydration method is realized by using the oil dehydration system described in Embodiment 3, which includes the following steps:

Two sets of oil dehydration devices are used to dehydrate crude oil alternately, that is, when one set of oil dehydration device dehydrates crude oil, the other set of oil dehydration device receives the crude oil after sedimentation and separation;

The method specifically includes:

When the first crude oil dehydration unit is used for crude oil dehydration, close the valve on the oil outlet line of the first dehydration tank in the first crude oil dehydration unit, so that the crude oil enters the cruciform conduit through the open end of the cross conduit of the distributor and then enters the circular ring. Dispersion pipe; Crude oil enters the first dehydration tank slowly along the tank wall of the first dehydration tank from several small holes opened on the oblique lower side of the annular dispersion pipe, and settles and separates in the first dehydration tank;

When the crude oil level reaches the design level of the first dehydration tank, close the valve on the inlet line of the first dehydration tank, open the valve on the oil outlet line of the first dehydration tank, and start to transport the separated crude oil to the second crude oil dehydration device. The second dehydration tank in the middle; the water separated by sedimentation at the bottom of the first dehydration tank is discharged from the first dehydration tank through the bottom water outlet line;

When the second crude oil dehydration device is used for crude oil dehydration, close the valve on the oil outlet line of the second dehydration tank in the second crude oil dehydration device, so that the crude oil enters the cross-shaped conduit through the open end of the cross-conduit of the distributor and then enters the circular ring. Dispersion pipe; the crude oil enters the second dehydration tank slowly along the tank wall of the second dehydration tank from a number of small holes opened on the oblique lower side of the annular dispersion pipe, and settles and separates in the second dehydration tank;

When the crude oil level reaches the design level of the second dehydration tank, close the valve on the inlet line of the second dehydration tank, open the valve on the oil outlet line of the second dehydration tank, and start to transport the separated crude oil to the first crude oil dehydration device. The first dehydration tank in the middle; the water separated by the bottom sedimentation of the second dehydration tank is discharged from the second dehydration tank through the bottom outlet line.

In this embodiment, the water separated from the bottom of the first dehydration tank and the second dehydration tank is discharged through the water outlet pipeline at the bottom of the tank and then enters the automatic water cutter.

The oil used in Examples 4 to 5 of the present invention is the condensate in the tower (water content is 0.5wt%). After the dehydration treatment, the average water content of the condensate oil is 0.03 wt%, and it can be seen that the dehydration effect is remarkable. In addition, the production of condensate in the Tazhong area increases year by year, and its water content fluctuates greatly, and the method provided by the present invention can adapt to the situation where the oil water content fluctuates greatly.

To sum up, the devices, systems and methods provided by the embodiments of the present invention adopt the concept of small feeding, slow feeding, and establishing a sufficiently stable field, and are based on the theory of large-tank sedimentation and dehydration. Deep dehydration of crude oil in a state of "water-in-oil" at about 0.5 wt% can make the water content of the crude oil less than 0.1 wt% after deep dehydration.

The technical solutions provided by the embodiments of the present invention have the following advantages:

(1) High dehydration accuracy, overcoming the difficulty of dehydration of crude oil in the "water-in-oil" state, and the water content of crude oil can be further removed from 0.50wt% to less than 0.1wt%. May be less than 0.05 wt%.

(2) The process is simple, convenient and flexible, easy to implement, and less one-time investment.

(3) The crude oil dehydration is carried out by the physical sedimentation method, without additional consumption and investment, and the energy saving effect is remarkable.

(4) The overall structure of the equipment is small in size and does not consume the volume of the large tank.

(5) The technology is easy to operate without adding additional operators.

(6) It is convenient for construction. Whether it is a new large tank or an old tank renovation, this technical solution can be used, and it has a wide application prospect in the field of crude oil dehydration.

The above descriptions are only specific embodiments of the present invention, and cannot limit the scope of implementation of the invention. Therefore, the replacement of equivalent components, or the equivalent changes and modifications made according to the scope of the patent protection of the present invention should still be covered by this patent. category. In addition, the technical features and technical features, technical features and technical inventions, and technical inventions and technical inventions in the present invention 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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