Filter with online cleaning function

Abstract

The utility model relates to natural gas production matching equipment technical field, concretely relates to a filter with on -line cleaning function, including casing, filter bowl, first flush pipe and second flush pipe, filter bowl divides casing into liquid inlet chamber and liquid outlet chamber, first flush pipe is inserted into liquid outlet chamber and is distributed and is equipped with a plurality of flush holes, second flush pipe is inserted into liquid inlet chamber along the inner bottom of casing and is opposite and is equipped with blowdown, first flush pipe and second flush pipe are connected with liquid supply mechanism and / or gas supply mechanism. Through first flush pipe, the filter bowl is carried out reverse flushing from liquid outlet chamber side to liquid inlet chamber side, can make the impurity on filter bowl be washed and fall to liquid inlet chamber, is discharged from blowdown pipe, realizes the effect that filter bowl cleaning can be carried out without removing gland, simultaneously, through second flush pipe, further realize the impurity removal to casing inner space, improve cleaning efficiency and effect, easy operation, can avoid disassembly and assembly gland influence production, and not easy to cause environmental pollution.

Description

Technical Field

[0001] This utility model relates to the technical field of supporting equipment for natural gas production, specifically to a filter with an online cleaning function. Background Technology

[0002] Natural gas extracted from natural gas wells is usually discharged in the form of a mixture containing gravel, rock, water, oil and natural gas. A three-phase separator is generally installed in the production process of natural gas wells. In order to reduce the filtration pressure of the three-phase separator and extend its service life, a conventional separation and filtration device is usually installed before the three-phase separator.

[0003] like Figure 1 As shown, existing separation and filtration devices generally use cylindrical filter screens as filtration components. The cylindrical filter screens are installed inside a housing with a pressure cap. After a certain period of use, the cylindrical filter screens are prone to clogging, which leads to an increase in the pressure difference across the filtration component. Once the pressure difference exceeds the threshold, the pressure cap needs to be removed to clean the cylindrical filter screens. However, removing the pressure cap requires shutting down the gas well gas extraction process, which affects the gas well production efficiency and poses a risk of natural gas leakage, which can easily cause environmental pollution. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing conventional cylindrical filter screens for natural gas wells, which require disassembly and cleaning of the filter components, affecting production efficiency and causing environmental pollution. This invention provides a filter with an online cleaning function.

[0005] This utility model provides a filter with an online cleaning function, comprising: Housing, with a detachable pressure cap on the top of the housing; A filter cartridge is detachably connected inside the housing, dividing the housing into a lower inlet chamber and an upper outlet chamber. The inlet chamber is connected to an inlet pipe, and the outlet chamber is connected to an outlet pipe. A first flushing pipe extends into the liquid outlet chamber, and a plurality of flushing holes are distributed on the first flushing pipe. The second flushing pipe extends into the liquid inlet chamber along the inner bottom of the housing, and a drain port is provided on the housing opposite to the second flushing pipe, the drain port being connected to the drain pipe; The first flushing pipe and the second flushing pipe are connected to a liquid supply mechanism and / or a gas supply mechanism.

[0006] This utility model discloses a filter with an online cleaning function. The filter cartridge is flushed in reverse from the outlet chamber to the inlet chamber through a first flushing pipe. This allows impurities clogging the filter cartridge to be flushed off and fall into the inlet chamber, and then discharged through the drain pipe. This achieves the effect of cleaning the filter cartridge without removing the pressure cap. At the same time, the impurities at the bottom of the inlet chamber are flushed through a second flushing pipe, further removing impurities from the internal space of the housing. This improves cleaning efficiency and effect, is easy to operate, avoids the impact of disassembling and assembling the pressure cap on production, and is less likely to cause environmental pollution.

[0007] Preferably, the first flushing pipe passes through the pressure cap and extends into the liquid outlet chamber, and a sealing element is provided between the first flushing pipe and the pressure cap. This allows for relatively easy modification and installation on existing filter structures.

[0008] Preferably, a plurality of the flushing holes are distributed around the first flushing pipe, and at least one of the flushing holes is located at the end of the first flushing pipe that extends into the housing. This forms a screen-like structure on the first flushing pipe, enabling thorough circumferential flushing of the filter cartridge.

[0009] Preferably, the several rings of flushing holes are staggered along the axial direction of the first flushing pipe, with at least one ring of flushing holes facing the top edge of the filter cartridge. This further improves the flushing and cleaning effect.

[0010] Preferably, the end of the first flushing pipe that extends into the housing is provided with a nozzle mechanism, and the nozzle mechanism is provided with a plurality of flushing holes. The nozzle mechanism disperses the flushing liquid or gas, enabling thorough flushing and cleaning of the bottom area of ​​the filter cartridge.

[0011] Preferably, the end of the second flushing pipe extending into the housing has a flattened section, the projection of which onto the bottom of the housing forms a fan shape. This causes the flow rate of the liquid or gas output from the second flushing pipe to change due to the change in cross-sectional area, enabling flushing of a wider area at the bottom of the housing.

[0012] Preferably, the bottom of the filter cartridge is cone-shaped. This makes it less prone to clogging with impurities, and even if clogging occurs, the impurities can be washed away by gravity.

[0013] Preferably, a blind plate is provided on the side of the filter cartridge corresponding to the liquid inlet pipe. This allows impurities in the liquid entering the housing to be blocked and more easily fall to the bottom of the housing, thereby preventing the filter cartridge from becoming clogged.

[0014] Preferably, the system further includes a valve control assembly, which includes a first valve disposed on the inlet pipe, a second valve disposed on the outlet pipe, a third valve disposed on the first flushing pipe, a fourth valve disposed on the second flushing pipe, and a fifth valve disposed on the drain pipe. The valve control assembly controls the on / off state of each pipeline.

[0015] Preferably, the outlet pipe and the inlet pipe are each equipped with a pressure monitoring mechanism, which is linked to the valve control assembly. This allows for process adjustments for filter cartridge cleaning and normal production based on the real-time detection results of the pressure monitoring mechanism.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a filter with an online cleaning function. The filter cartridge is flushed in reverse from the liquid outlet side to the liquid inlet side through the first flushing pipe. This allows the impurities clogging the filter cartridge to be flushed off and fall into the liquid inlet, and then discharged from the drain pipe. This achieves the effect of cleaning the filter cartridge without removing the pressure cap. 2. This utility model provides a filter with an online cleaning function, which flushes the impurities at the bottom of the liquid inlet chamber through a second flushing pipe, thereby further removing impurities from the internal space of the housing and improving cleaning efficiency and effect; 3. This utility model provides a filter with an online cleaning function, which is easy to operate, can avoid the impact of disassembling and assembling the cap on production, and is less likely to cause environmental pollution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing separation and filtration device; Figure 2 This is a schematic diagram of the structure of a filter with online cleaning function according to Example 1. Figure 1 ; Figure 3 This is a top view of the flat section described in Example 1; Figure 4 This is a schematic diagram of the structure of a filter with online cleaning function according to Example 1. Figure 2 ; Figure 5 This is a simplified structural diagram of a filter with an online cleaning function according to Example 1.

[0018] Marked in the image: 1-Housing, 11-Inlet chamber, 12-Outlet chamber, 2-Pressure cap, 3-Filter cartridge, 31-Blind plate, 4-Inlet pipe, 5-Outlet pipe, 6-First flushing pipe, 61-Flushing hole, 62-Nozzle mechanism, 7-Second flushing pipe, 71-Flat section, 8-Drain pipe, 91-First valve, 92-Second valve, 93-Third valve, 94-Fourth valve, 95-Fifth valve, 10-Pressure monitoring mechanism. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0020] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0022] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0023] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0024] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0025] Example 1 like Figures 2-5 As shown, a filter with online cleaning function includes a housing 1, a filter cartridge 3, a first flushing pipe 6, and a second flushing pipe 7. A pressure cap 2 is detachably connected to the top of the housing 1. The filter cartridge 3 is detachably connected inside the housing 1, dividing the housing 1 into a lower inlet chamber 11 and an upper outlet chamber 12. The inlet chamber 11 is connected to an inlet pipe 4, and the outlet chamber 12 is connected to an outlet pipe 5. The first flushing pipe 6 extends into the outlet chamber 12 and is provided with a plurality of flushing holes 61. The second flushing pipe 7 extends into the inlet chamber 11 along the inner bottom of the housing 1. A drain outlet is provided on the housing 1 opposite to the second flushing pipe 7, and the drain outlet is connected to a drain pipe 8.

[0026] The housing 1 is the main structure of the filter, and the filter cartridge 3 is set inside the housing 1. The housing 1 is provided with an inlet pipe 4 and an outlet pipe 5. In order to facilitate the connection between the outlet pipe 5 and the outlet chamber 12 and to increase the overall filtration surface area of ​​the filter cartridge 3, the top of the filter cartridge 3 is set to be inclined. In use, the mixed fluid containing impurities enters the housing 1 through the inlet pipe 4, is filtered by the filter cartridge 3 and is output from the outlet pipe 5. The impurities that are filtered out can be output from the drain pipe 8 when the drain pipe 8 is open. The first flushing pipe 6 and the second flushing pipe 7 are used to extend into the housing 1 and, with the cooperation of the liquid supply mechanism or the air supply mechanism, clean the filter cartridge 3 online. The impurities that are cleaned can also be output from the drain pipe 8, so that the filter cartridge 3 can be cleaned and kept unobstructed without disassembling the housing 1. This embodiment is illustrated by taking the connection of the first flushing pipe 6 and the second flushing pipe to the liquid supply mechanism as an example.

[0027] In one or more implementations, such as Figure 2As shown, the first flushing pipe 6 can pass through the pressure cap 2 and extend into the liquid outlet chamber 12. Several flushing holes 61 can be distributed around the first flushing pipe 6, and at least one flushing hole 61 is located at the end of the first flushing pipe 6 that extends into the housing 1. The housing 1, filter cartridge 3, pressure cap 2, inlet pipe 4, and outlet pipe 5 are all components of existing filters in use. The inlet pipe 4 is positioned lower than the outlet pipe 5. The mixed fluid is filtered by the filter cartridge 3 during its upward flow. By adopting the structure of extending the first flushing pipe 6 into the pressure cap 2, it is relatively easy to modify the existing filter structure to install the first flushing pipe 6, and form a screen-like structure on the first flushing pipe 6, which can thoroughly flush the filter cartridge 3 around its circumference. The bottom of the filter cartridge 3 can also be flushed through the flushing hole 61 located at the end of the first flushing pipe 6.

[0028] In an optional embodiment, a sealing element may be provided between the first flushing pipe 6 and the gland 2. The sealing element is used to seal any possible gaps between the first flushing pipe 6 and the gland 2 to ensure the sealing performance of the filter during use. Specifically, the sealing element can be selected according to the usage conditions. It can be a graphite gasket ring, which can withstand a certain pressure and corrosion and maintain the sealing effect.

[0029] In an optional embodiment, several rings of flushing holes 61 may be staggered along the axial direction of the first flushing pipe 6, with at least one ring of flushing holes 61 facing the top edge of the filter cartridge 3. During use, the flushing liquid flows from the flushing holes 61 at a certain pressure toward the peripheral and bottom walls of the filter cartridge 3 to remove sand and other impurities from the filter cartridge 3. The liquid flow flows downward along the top edge of the filter cartridge 3 under the action of gravity, and the side walls of the filter cartridge 3 are cleaned by the liquid flow in both the horizontal and vertical directions, further improving the flushing and cleaning effect.

[0030] In optional implementations, such as Figure 4 As shown, the end of the first flushing pipe 6 that extends into the housing 1 may be provided with a nozzle mechanism 62. Several flushing holes 61 are distributed on the nozzle mechanism 62. The nozzle mechanism 62 disperses the flushing liquid or gas to widen the cleaning range at the end of the first flushing pipe 6, so as to cover the bottom area of ​​the filter cartridge 3 and thoroughly clean the bottom area of ​​the filter cartridge 3.

[0031] In an optional embodiment, the nozzle mechanism 62 can be a conical blind end structure welded to the bottom of the first flushing pipe 6, or it can be a finished nozzle structure. Preferably, it can be a self-made conical blind end structure made of corrosion-resistant material, having a blind end face away from the first flushing pipe 6 and a conical face located between the blind end face and the first flushing pipe 6. The blind end face and the conical face can be respectively provided with flushing holes 61.

[0032] In one or more implementations, such as Figure 2 , Figure 3As shown, the second flushing pipe 7 has a flat section 71 at one end that extends into the housing 1, and the projection of the flat section 71 on the bottom of the housing 1 is fan-shaped. This causes the flow rate of the liquid output from the second flushing pipe 7 to change due to the change in cross-sectional area, enabling flushing of a relatively wide area at the bottom of the housing 1.

[0033] In an optional embodiment, the flat section 71 can be a duckbill nozzle, which is fixedly connected to the end of the second flushing pipe 7. The wide surface of the duckbill nozzle is parallel to the inner bottom surface of the housing 1. The liquid flow input from the second flushing pipe 7 can flush the inner bottom surface of the housing 1 over a wider range, so that sand and impurities enter the drain pipe 8 from the drain outlet.

[0034] In one or more embodiments, the bottom of the filter cartridge 3 is set in a conical shape, and there is a gap between the bottom of the conical filter cartridge 3 and the inner bottom surface of the housing 1, so that impurities are not easily blocked on the filter cartridge 3, and even if impurities are blocked, they can be easily washed off under the action of gravity.

[0035] In one or more embodiments, a blind plate 31 may be provided on the side of the filter cartridge 3 corresponding to the liquid inlet pipe 4. The blind plate 31 may be an arc-shaped plate structure welded to the original filter cartridge 3, which can counteract and block the fluid input from the liquid inlet pipe 4, change the flow direction of the fluid, and make it easier for the sand and impurities in the fluid to be separated from the fluid under the action of gravity. This makes it easier for the impurities in the liquid entering the housing 1 to fall to the bottom of the housing 1 after being blocked, thereby avoiding the clogging of the filter cartridge 3.

[0036] In an optional embodiment, the blind flange 31 is slightly larger than the size of the hole at the through-hole between the liquid inlet pipe 4 and the housing 1, so that the blind flange 31 can fully block the fluid input by the liquid inlet pipe 4 and avoid the blind flange 31 from affecting the filtration effect of the filter.

[0037] In one or more implementations, such as Figure 5 As shown, the filter also includes a valve control assembly, which may include a first valve 91 installed in the inlet pipe 4, a second valve 92 installed in the outlet pipe 5, a third valve 93 installed in the first flushing pipe 6, a fourth valve 94 installed in the second flushing pipe 7, and a fifth valve 95 installed in the drain pipe 8. The valve control assembly is used to control the on / off state of each pipeline to adjust the filter's operating status.

[0038] In an optional embodiment, the outlet pipe 5 and the inlet pipe 4 may each be equipped with a pressure monitoring mechanism 10, which is linked to the valve control assembly. This allows for process adjustments for filter cartridge 3 cleaning and normal production based on the real-time detection results of the pressure monitoring mechanism 10.

[0039] In an optional embodiment, the pressure monitoring mechanism 10 can be a pressure transmitter, which collects the fluid pressure on the outlet pipe 5 and the inlet pipe 4, that is, collects the pressure information of the inlet chamber 11 and the outlet chamber 12, that is, the pressure on both sides of the filter cartridge 3. By determining the value of the pressure difference before and after the filter cartridge 3, the valve control mechanism at different positions can be opened or closed to realize the switching between normal operation and cleaning state of the filter.

[0040] In an optional implementation, when the pressure difference across the filter cartridge 3 is greater than 0.1 MPa, the first valve 91 on the inlet pipe 4 and the second valve 92 on the outlet pipe 5 are closed, the fifth valve 95 on the drain pipe 8 is opened, and the third valve 93 on the first flushing pipe 6 is opened, thereby cleaning the internal space of the housing 1 and the filter cartridge 3 to prevent blockage. Then, the fourth valve 94 is opened to clean the bottom of the housing 1.

[0041] This embodiment of a filter with an online cleaning function uses a first flushing pipe 6 to flush the filter cartridge 3 from the outlet chamber 12 to the inlet chamber 11. This flushes the impurities clogging the filter cartridge 3 into the inlet chamber 11 and discharges them through the drain pipe 8. This achieves the effect of cleaning the filter cartridge 3 without removing the pressure cap 2. At the same time, the second flushing pipe 7 flushes the impurities at the bottom of the inlet chamber 11, further removing impurities from the internal space of the housing 1, improving cleaning efficiency and effect. The whole process is easy to operate, does not require filter disassembly, avoids the impact of disassembling the pressure cap 2 on production, and is less likely to cause environmental pollution, thus improving cleaning efficiency.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A filter with an online cleaning function, characterized in that, include: A housing (1), the top of which is detachably connected to a pressure cap (2); The filter cartridge (3) is detachably connected inside the housing (1) and divides the housing (1) into a lower inlet chamber (11) and an upper outlet chamber (12). The inlet chamber (11) is connected to the inlet pipe (4) and the outlet chamber (12) is connected to the outlet pipe (5). A first flushing pipe (6) extends into the liquid outlet chamber (12), and a plurality of flushing holes (61) are distributed on the first flushing pipe (6); The second flushing pipe (7) extends into the liquid inlet chamber (11) along the inner bottom of the housing (1). The housing (1) opposite the second flushing pipe (7) is provided with a drain port, which is connected to the drain pipe (8). The first flushing pipe (6) and the second flushing pipe (7) are connected to a liquid supply mechanism and / or a gas supply mechanism.

2. A filter with online cleaning function according to claim 1, characterized in that, The first flushing tube (6) passes through the pressure cap (2) and extends into the liquid outlet chamber (12). A sealing element is provided between the first flushing tube (6) and the pressure cap (2).

3. A filter with online cleaning function according to claim 2, characterized in that, A plurality of the flushing holes (61) are distributed around the first flushing pipe (6), and at least one of the flushing holes (61) is located at the end of the first flushing pipe (6) that extends into the housing (1).

4. A filter with online cleaning function according to claim 3, characterized in that, Several rings of the flushing holes (61) are staggered along the axial direction of the first flushing pipe (6), with at least one ring of the flushing holes (61) facing the top edge of the filter cartridge (3).

5. A filter with online cleaning function according to claim 4, characterized in that, The first flushing pipe (6) has a nozzle mechanism (62) at one end that extends into the housing (1), and a plurality of flushing holes (61) are distributed on the nozzle mechanism (62).

6. A filter with online cleaning function according to claim 1, characterized in that, The second flushing pipe (7) has a flat section (71) at one end that extends into the housing (1), and the projection of the flat section (71) on the bottom of the housing (1) is fan-shaped.

7. A filter with online cleaning function according to claim 1, characterized in that, The bottom of the filter cartridge (3) is set in a conical shape.

8. A filter with online cleaning function according to claim 7, characterized in that, A blind plate (31) is provided on one side of the filter cartridge (3) corresponding to the liquid inlet pipe (4).

9. A filter with online cleaning function according to any one of claims 1-8, characterized in that, It also includes a valve control assembly, which includes a first valve (91) disposed on the inlet pipe (4), a second valve (92) disposed on the outlet pipe (5), a third valve (93) disposed on the first flushing pipe (6), a fourth valve (94) disposed on the second flushing pipe (7), and a fifth valve (95) disposed on the drain pipe (8).

10. A filter with online cleaning function according to claim 9, characterized in that, The outlet pipe (5) and the inlet pipe (4) are respectively equipped with pressure monitoring mechanisms (10), and the pressure monitoring mechanisms (10) are linked with the valve control assembly.

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