Closed oil discharge buffer device with filtering function

Abstract

The invention discloses a sealed oil discharge buffer device with a filtering function, which comprises an oil discharge buffer tank, an oil inlet, an oil outlet, a filter basket and a gas collection bag, the filter basket is arranged in the oil discharge buffer tank, a baffle plate is arranged in the oil discharge buffer tank corresponding to the mounting position of the filter basket, a horizontal section is arranged in the middle of the baffle plate, and the gas collection bag is arranged in the horizontal section. A filter basket via hole is formed in the horizontal section, the filter basket is mounted at the filter basket via hole, and a sealing structure is arranged between the filter basket and the horizontal section; the baffle and the filter basket divide the internal space of the oil discharge buffer tank into a crude oil cavity and a clean oil cavity; the oil inlet is formed in the side wall of the oil discharge buffer tank, and the oil inlet is communicated with a crude oil cavity in the oil discharge buffer tank; according to the oil unloading buffer tank, the filter basket is installed in the oil unloading buffer tank, solid particle impurities in crude oil can be filtered out, the filter basket is arranged in the oil unloading buffer tank, the space occupancy rate is small, the filter basket can be taken out of the oil unloading buffer tank, and impurities in the filter basket can be conveniently cleaned.

Description

Technical Field

[0001] The present application belongs to the field of oilfield gathering and transportation, and in particular relates to a closed oil unloading buffer device with a filtering function. Background Art

[0002] For well sites located in remote areas with no surrounding gathering and transportation pipelines or oilfield processing stations, crude oil needs to be transported to transfer stations or joint stations for processing, and oil unloading facilities need to be set up at transfer stations and joint stations. At present, the unloading of crude oil by trucks in oil fields mainly adopts semi-closed unloading tank unloading technology and closed unloading tank unloading technology. The unloading tank is generally a rectangular structure, which is welded by steel plates and steel sections. The automobile unloading process has gradually changed from the original semi-closed unloading to a fully closed unloading process, which is mainly composed of an unloading platform, an unloading buffer tank, an unloading pump and supporting processes. The unloading tank mainly adopts a vertical or horizontal pressure vessel. Filters are set in front of the unloading pump of both unloading processes. The unloading tank and the unloading tank have the following problems during the unloading process:

[0003] The oil unloading tank in the semi-closed oil unloading process is a rectangular structure. The stress condition is more complicated than that of a cylindrical container and cannot withstand large internal pressure and negative pressure. Due to the poor pressure bearing effect of the oil unloading tank, the oil and gas in the oil unloading tank evaporate more seriously, and the oil and gas gather around it, which poses certain accident hazards. The original commonly used oil unloading tank is difficult to meet the existing environmental protection requirements;

[0004] At present, the exhaust hole of the oil unloading buffer tank in the closed oil unloading process is only equipped with a breathing valve. During the oil unloading process, a large amount of volatile gas is exhaled from the breathing valve and evaporated into the air, polluting the environment and creating explosion safety hazards.

[0005] The exhaust pipeline of the oil unloading buffer tank in the closed oil unloading process is not equipped with a shutoff valve. When the tank truck is unloading, if the unloading pump is not started in time, it is easy to cause the exhaust pipe to overflow, which is easy to cause freezing and blockage in winter, causing safety accidents;

[0006] The volume of the oil unloading buffer tank in the closed oil unloading process is small. When the unloading pump is started, the liquid level is unstable, which can easily cause vacuuming, sucking air into the buffer tank, and sending the air into the station oil storage tank through the oil unloading pump, which is prone to safety risks;

[0007] Since the unloading is intermittent operation, the low liquid level in the buffer tank cannot be completely discharged, and there is a risk of solidification of the liquid in the buffer tank. The unloading pump is installed outdoors, and the crude oil in the pump body solidifies and freezes during intermittent operation;

[0008] At present, most of the oil unloading skids have filters installed in front of the oil unloading pumps, which makes the skid body large and the process complicated.

[0009] During the oil unloading process, some of the oil from individual wells contains a large amount of impurities, and solid particle impurities may enter the pump, damaging the pump body and reducing the service life of the pump. A basket filter is usually installed outside the front of the oil unloading pump. Generally, the filter body is small, and the filter frequently clogs after the oil unloading enters the unloading system. Moreover, installing the filter makes the process installation complex and occupies a large area. Summary of the Invention

[0010] In order to overcome the defects of the above-mentioned existing technologies, the present application provides a closed oil unloading buffer device with a filtering function. To achieve the above object, the present application provides the following technical solutions:

[0011] A closed oil unloading buffer device with a filtering function, comprising: an oil unloading buffer tank, an oil inlet, an oil outlet, a filter basket, and a gas collecting bag. Among them,

[0012] The filter basket is arranged inside the oil unloading buffer tank. A baffle is provided at the installation position of the filter basket in the oil unloading buffer tank. The middle part of the baffle is provided with a horizontal section. A filter basket through hole is provided at the horizontal section. The filter basket is installed at the filter basket through hole. A sealing structure is provided between the filter basket and the horizontal section; the baffle and the filter basket divide the internal space of the oil unloading buffer tank into a crude oil chamber and a clean oil chamber;

[0013] The oil inlet is arranged on the side wall of the oil unloading buffer tank, and the oil inlet is communicated with the crude oil chamber inside the oil unloading buffer tank;

[0014] The oil outlet is arranged on the side wall of the oil unloading buffer tank, and the oil outlet is communicated with the clean oil chamber inside the oil unloading buffer tank;

[0015] The gas collecting bag is arranged on the top of the oil unloading buffer tank, and the gas collecting bag is communicated with the clean oil chamber inside the oil unloading buffer tank.

[0016] Further, the filter basket is detachably installed in the oil unloading buffer tank.

[0017] Further, a quick-opening manhole is provided at the top of the oil unloading buffer tank corresponding to the upper part of the filter basket, and a filter basket handle is provided at the top of the filter basket.

[0018] Further, the filter basket includes a filter screen and a stainless steel filter cylinder. The filter screen is installed inside the stainless steel filter cylinder, and the filter screen is set to 10 meshes.

[0019] Further, a baffle plate is provided at the lower part of the oil unloading buffer tank corresponding to the filter basket, and the baffle plate is inclinedly installed inside the oil unloading buffer tank.

[0020] Further, a heating coil is provided inside the oil unloading buffer tank. Two ports of the heating coil pass through the tank wall of the oil unloading buffer tank and extend to the outside of the oil unloading buffer tank. The heating coil is bent and folded multiple times inside the oil unloading buffer tank.

[0021] Further, a local liquid level gauge is installed inside the oil unloading buffer tank, and a radar liquid level gauge is installed outside the oil unloading buffer tank.

[0022] Further, a pneumatic cut-off valve is provided at the exhaust port at the top of the gas collecting header. The pneumatic cut-off valve is interlocked with the local liquid level gauge and / or the radar liquid level gauge. The pneumatic cut-off valve opens or closes after the values of the local liquid level gauge and / or the radar liquid level gauge reach preset conditions.

[0023] Further, an exhaust pipe is also installed at the discharge end of the pneumatic cut-off valve, and a flame arrester and a breather valve are installed on the exhaust pipe.

[0024] Further, a sand washing port is provided on the oil unloading buffer tank.

[0025] Technical effects and advantages of the present application:

[0026] In the present application, a filter basket is installed inside the oil unloading buffer tank, which can filter solid particle impurities in the crude oil. The filter basket is arranged inside the oil unloading buffer tank, with a small space occupancy rate. Moreover, the filter basket can be taken out of the oil unloading buffer tank, facilitating the cleaning of impurities inside the filter basket.

[0027] Other features and advantages of the present application will be described in the subsequent specification, and will, in part, become apparent from the specification or be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures pointed out in the specification and the drawings. Brief Description of the Drawings

[0028] Figure 1 It is the front view of a closed oil unloading buffer device with a filtering function according to the present application;

[0029] Figure 2 It is the side view of a closed oil unloading buffer device with a filtering function according to the present application;

[0030] In the figure: 1 - oil unloading buffer tank, 2 - oil inlet, 3 - oil outlet, 4 - filter basket, 5 - filter basket handle, 6 - quick-opening manhole, 7 - baffle, 8 - gas collecting header, 9 - exhaust port, 10 - pneumatic cut-off valve, 11 - flame arrester, 12 - breather valve, 13 - local liquid level gauge, 14 - radar liquid level gauge, 15 - heating coil, 16 - saddle support, 17 - baffle plate, 18 - sand washing port. Detailed Description of the Embodiments

[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0032] In addition, in the invention, terms such as "first", "second" and other similar terms do not imply any order, quantity or importance, but are only used to distinguish different elements. Terms such as "upper", "lower", "left", "right" and other similar terms are only the positional relationships in the drawings.

[0033] As Figure 1 shown, an airtight oil unloading buffer device with a filtering function provided by an embodiment of the present application includes: an oil unloading buffer tank 1, an oil inlet 2, an oil outlet 3, a filter basket 4 and a gas collecting tank 8. Among them,

[0034] The oil unloading buffer tank 1 adopts a horizontal container structure. The oil unloading buffer tank 1 is welded by a cylinder body and end heads arranged at two axial ends of the cylinder body. The oil unloading buffer tank 1 is supported by saddle supports 16. The oil unloading buffer tank 1 adopts a horizontal container structure, which can withstand greater internal pressure and negative pressure, avoiding the strength damage of the container caused by excessive pressure during the oil unloading process and the instability of the container caused by the evacuation of the oil unloading tank.

[0035] The filter basket 4 is arranged inside the oil unloading buffer tank 1. A baffle 7 is arranged at the installation position of the filter basket 4 in the oil unloading buffer tank 1. As Figure 1 shown, in the figure, the cross-section of the baffle 7 is concave-shaped. As Figure 2 shown, in the figure, the cross-section of the baffle 7 is arc-shaped. The middle part of the baffle 7 is provided with a horizontal section, and a filter basket through-hole is arranged at the horizontal section. The filter basket 4 is installed at the filter basket through-hole, and a sealing structure is arranged between the filter basket 4 and the horizontal section; the baffle 7 and the filter basket 4 divide the internal space of the oil unloading buffer tank 1 into two parts, namely the crude oil chamber and the clean oil chamber, so that the crude oil in the crude oil chamber can only enter the clean oil chamber through the filter basket 4.

[0036] As Figure 2 shown, the oil inlet 2 is welded on the side wall of the oil unloading buffer tank 1, and the oil inlet 2 is communicated with the crude oil chamber inside the oil unloading buffer tank 1;

[0037] As Figure 1 shown, the oil outlet 3 is welded on the side wall of the oil unloading buffer tank 1, and the oil outlet 3 is communicated with the clean oil chamber inside the oil unloading buffer tank 1;

[0038] As Figure 1As shown, the gas collecting header 8 is welded to the top of the oil unloading buffer tank 1. The gas collecting header 8 is communicated with the clean oil chamber inside the oil unloading buffer tank 1. When filling crude oil, the air in the oil unloading buffer tank 1 can be discharged. While ensuring that the crude oil does not overflow the oil unloading buffer tank 1 through the gas collecting header 8, the liquid level of the oil unloading buffer tank 1 can reach the highest, reducing the probability of air entering the oil unloading pump and the storage tank.

[0039] After the crude oil enters the oil unloading buffer tank 1 through the oil inlet 2, it is stored in the crude oil chamber in the oil unloading buffer tank 1. After being filtered by the filter basket 4, it enters the clean oil chamber in the oil unloading buffer tank 1. The filter basket 4 can filter the solid impurities in the crude oil, preventing the solid impurities in the oil product from entering the subsequent oil unloading pump and reducing the service life of the oil unloading pump.

[0040] In an embodiment of the present application, to facilitate the cleaning of the solid impurities in the filter basket 4, the filter basket 4 is detachably installed in the oil unloading buffer tank 1. Specifically:

[0041] As Figure 1 shown, a quick-opening manhole 6 is provided at the top of the oil unloading buffer tank 1 corresponding to the upper part of the filter basket 4. On the other hand, a filter basket handle 5 is provided at the top of the filter basket 4. By opening the cover of the quick-opening manhole 6, the filter basket 4 can be taken out from the oil unloading buffer tank 1 to facilitate the cleaning of the solid impurities in the filter basket 4.

[0042] In an embodiment of the present application, the filter basket 4 is made of a stainless steel filter cylinder and a filter screen, and the filter screen is set to 10 meshes. Compared with the traditional basket filter, the filter screen can be arranged on the side and bottom of the stainless steel filter barrel, thereby increasing the effective filtration area and reducing the pressure loss.

[0043] In an embodiment of the present application, a baffle plate 17 is provided inside the oil unloading buffer tank 1 corresponding to the lower part of the filter basket 4. The baffle plate 17 is inclinedly installed inside the oil unloading buffer tank 1. After the crude oil is filtered by the filter basket 4, it will flow onto the baffle plate 17 and flow along the baffle plate 17 to the bottom of the oil unloading buffer tank 1 to prevent static electricity from being generated due to the friction between the crude oil and the air after the oil product passes through the filter basket 4, causing safety risks.

[0044] In an embodiment of the present application, a heating coil 15 is arranged inside the oil unloading buffer tank 1. Two ports of the heating coil 15 pass through the tank wall of the oil unloading buffer tank 1 and extend to the outside of the oil unloading buffer tank 1. The heating coil 15 is bent and folded multiple times inside the oil unloading buffer tank 1 to increase the contact area between the heating coil 15 and the crude oil; the ports of the heating coil 15 are connected to a heating pipeline, and a heat transfer fluid is input into the heating coil 15 through the heating pipeline to heat the crude oil inside the oil unloading buffer tank 1 to prevent the crude oil from condensing inside the oil unloading buffer tank 1.

[0045] In one embodiment of the present application, a local liquid level gauge 13 is installed inside the oil unloading buffer tank 1, and a radar liquid level gauge 14 is installed outside the oil unloading buffer tank 1. By jointly detecting the liquid level condition in the oil unloading buffer tank 1 with the local liquid level gauge 13 and the radar liquid level gauge 14, the potential safety hazards caused by liquid level gauge failures or interference can be reduced; the local liquid level gauge 13 and the radar liquid level gauge 14 can be interlocked with the oil unloading pump. When the liquid level inside the oil unloading buffer tank 1 reaches the highest set value, the oil unloading pump is started for oil unloading. When the liquid level inside the oil unloading buffer tank 1 reaches the lowest set value, the oil unloading pump is shut down to stop oil unloading. It can be understood that the oil unloading pump is connected to the oil outlet 3 at the bottom of the oil unloading buffer tank 1 to pump out the crude oil in the oil unloading buffer tank 1.

[0046] In one embodiment of the present application, a pneumatic cut-off valve 10 is provided at the exhaust port 9 at the top of the gas collecting header 8. The pneumatic cut-off valve 10 is interlocked with the local liquid level gauge 13 and / or the radar liquid level gauge 14 to achieve high liquid level interlock closing of the oil unloading buffer tank 1 and low liquid level interlock opening of the valve. Specifically:

[0047] When the oil unloading buffer tank 1 is connected to the tanker and the tanker starts unloading, the pneumatic cut-off valve 10 is opened. The crude oil in the tanker automatically enters the oil unloading buffer tank 1, driving the mixed gas in the oil unloading buffer tank 1 into the gas collecting header 8 and finally discharging it through the pneumatic cut-off valve 10. When the liquid level in the oil unloading buffer tank 1 reaches the high liquid level alarm, the pneumatic cut-off valve 10 is closed, and at the same time, the oil unloading pump is started to pump the crude oil into the storage tank. At this time, the oil unloading buffer tank 1 and the oil unloading pipeline form a closed space, which is equivalent to the oil unloading pump directly extracting crude oil from the tanker to accelerate the unloading speed; in the later stage of oil unloading, when the liquid level of the oil unloading buffer tank 1 drops to the low liquid level alarm, the unloading pump is stopped, and the pneumatic cut-off valve 10 is reopened.

[0048] In one embodiment of the present application, an exhaust pipeline is also installed at the discharge end of the pneumatic cut-off valve 10, and a flame arrester 11 and a breather valve 12 are installed on the exhaust pipeline; the breather valve 12 can maintain a certain pressure inside the oil unloading buffer tank 1. Under normal conditions, the breather valve 12 is in a closed state, isolating the internal space of the oil unloading buffer tank 1 from the atmosphere, which plays a role in reducing the evaporation loss of volatile liquids in the oil unloading buffer tank 1. At the same time, the breather valve 12 can automatically open under negative pressure to prevent the storage tank from being sucked flat.

[0049] In one embodiment of the present application, a sand washing port 18 is provided on the oil unloading buffer tank 1. The buffer tank and the filter screen can be periodically flushed through the sand washing port 18, avoiding frequent equipment cleaning and reducing the labor intensity of operating personnel.

[0050] Finally, it should be noted that the above are only preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A closed oil unloading buffer device with a filtering function, characterized in that Comprising: An oil unloading buffer tank (1), an oil inlet (2), an oil outlet (3), a filter basket (4), and a gas collecting header (8). Among them, the filter basket (4) is arranged inside the oil unloading buffer tank (1). A baffle (7) is provided at the installation position of the filter basket (4) in the oil unloading buffer tank (1). The middle part of the baffle (7) has a horizontal section, and a filter basket through-hole is provided at the horizontal section. The filter basket (4) is installed at the filter basket through-hole, and a sealing structure is provided between the filter basket (4) and the horizontal section; the baffle (7) and the filter basket (4) divide the internal space of the oil unloading buffer tank (1) into a crude oil chamber and a clean oil chamber; the oil inlet (2) is arranged on the side wall of the oil unloading buffer tank (1), and the oil inlet (2) communicates with the crude oil chamber inside the oil unloading buffer tank (1); the oil outlet (3) is arranged on the side wall of the oil unloading buffer tank (1), and the oil outlet (3) communicates with the clean oil chamber inside the oil unloading buffer tank (1); the gas collecting header (8) is arranged on the top of the oil unloading buffer tank (1), and the gas collecting header (8) communicates with the clean oil chamber inside the oil unloading buffer tank (1).

2. The closed oil unloading buffer device with a filtering function according to claim 1, characterized in that, The filter basket (4) is detachably installed in the oil unloading buffer tank (1).

3. A sealed oil unloading buffer device with a filtering function according to claim 2, characterized in that A quick-opening manhole (6) is provided above the filter basket (4) corresponding to the top of the oil unloading buffer tank (1), and a filter basket handle (5) is provided at the top of the filter basket (4).

4. A sealed oil unloading buffer device with a filtering function according to claim 1, characterized in that, The filter basket (4) includes a filter mesh and a stainless steel filter cylinder. The filter mesh is installed inside the stainless steel filter cylinder, and the filter mesh is set to 10 meshes.

5. A closed oil unloading buffer device with a filtering function according to claim 1, characterized in that, A baffle plate (17) is provided below the filter basket (4) corresponding to the inside of the oil unloading buffer tank (1), and the baffle plate (17) is inclinedly installed inside the oil unloading buffer tank (1).

6. The closed oil unloading buffer device with a filtering function according to claim 1, characterized in that, A heating coil (15) is arranged inside the oil unloading buffer tank (1). Two ports of the heating coil (15) pass through the tank wall of the oil unloading buffer tank (1) and extend to the outside of the oil unloading buffer tank (1), and the heating coil (15) is bent and folded multiple times inside the oil unloading buffer tank (1).

7. The closed oil unloading buffer device with a filtering function according to claim 2, characterized in that A local liquid level gauge (13) is installed inside the oil unloading buffer tank (1), and a radar liquid level gauge (14) is installed outside the oil unloading buffer tank (1).

8. A closed oil unloading buffer device with a filtering function according to claim 1, characterized in that, A pneumatic cut-off valve (10) is provided at the exhaust port (9) at the top of the gas collecting header (8). The pneumatic cut-off valve (10) is interlocked with the local liquid level gauge (13) and / or the radar liquid level gauge (14). After the values of the local liquid level gauge (13) and / or the radar liquid level gauge (14) reach preset conditions, the pneumatic cut-off valve (10) opens or closes.

9. The closed oil unloading buffer device with a filtering function according to claim 8, characterized in that, An exhaust pipe is also installed at the discharge end of the pneumatic cut-off valve (10), and a flame arrester (11) and a breather valve (12) are installed on the exhaust pipe.

10. A sealed oil unloading buffer device with a filtering function according to claim 1, characterized in that, A sand washing port (18) is provided on the oil unloading buffer tank (1).

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