CN114441000A - Flowmeter cleaning device - Google Patents

Abstract

The application discloses a flowmeter cleaning device, which belongs to the technical field of oilfield water injection. The flowmeter cleaning device provided by the embodiment of the present application is arranged between the water injection pipeline and the flowmeter. In the device, the inner filter barrel is located in the outer filter barrel, and one end of the inner filter barrel is communicated with the flowmeter through the output pipe section, and the other end is provided with a detachable filter. connector. Based on the above structure, when cleaning the flowmeter, it is only necessary to remove the inner filter barrel through the detachable joint, and then pass through the outer filter barrel to clean the flowmeter, thus eliminating the need to disassemble and install the flowmeter, reducing the need for The cleaning operation time is reduced, the labor intensity is reduced, and the cleaning efficiency is improved.

Description

Flowmeter cleaning device

technical field

The present application relates to the technical field of oilfield water injection. In particular, it relates to a flowmeter cleaning device.

Background technique

In the process of oilfield development, water is generally injected into the oilfield through water injection wells to maintain the pressure of the oil layer, so that the oil layer has a strong driving force, thereby increasing the oil production. Among them, when injecting water into the water injection well, the amount of injected water is mainly measured by a flowmeter installed on the water injection pipeline. However, the water injected into the oil field is generally sewage, and the sewage contains impurities. If it flows through the flowmeter for a long time, the flowmeter will be blocked or the flowmeter probe will be polluted. In this case, the flowmeter needs to be cleaned.

In the related art, when cleaning the flowmeter, it is necessary to stop the water injection operation first, then disassemble the flowmeter for cleaning, and then install the cleaned flowmeter on the water injection pipeline.

However, in the related art, the flowmeter needs to be disassembled for cleaning, and it needs to be installed after cleaning. Therefore, the operation time for cleaning the flowmeter is long and labor-intensive, resulting in low cleaning efficiency.

SUMMARY OF THE INVENTION

The embodiment of the present application provides a flowmeter cleaning device, which can improve the cleaning efficiency of the flowmeter. The specific technical solutions are as follows:

The embodiment of the present application provides a flowmeter cleaning device, the device includes: an input pipe section, an outer filter barrel, an inner filter barrel, an output pipe section and an emptying valve;

the filtering inner barrel is located in the filtering outer barrel;

The first end of the input pipe section is communicated with the water injection pipeline through a control valve, the second end of the input pipe section is communicated with the first end of the filter outer barrel, and the second end of the filter outer barrel is communicated with the emptying The valve is detachably connected through the plug;

The first end of the output pipe section passes through the third end of the outer filter barrel and is detachably connected to the first end of the inner filter barrel;

The second end of the filter inner barrel is provided with a detachable joint, and the second end of the output pipe section is communicated with the flow meter;

When water is injected through the water injection line, the emptying valve is in a closed state;

When the flowmeter is cleaned, the evacuation valve is in an open state, and the plug is used to disassemble the evacuation valve and separate the evacuation valve from the filter outer barrel; The disassembly joint is used to disassemble the filter inner barrel after the emptying valve is separated from the filter inner barrel, and separate the filter inner barrel from the output pipe section; the filter outer barrel is used to provide the flow Channels for cleaning operations.

In a possible implementation manner, the first end of the output pipe section is provided with an outer thread, and the first end of the filter inner barrel is provided with an inner thread;

The first end of the output pipe section is communicated with the first end of the inner filter barrel through the outer thread and the inner thread.

In another possible implementation manner, a circular hole is provided on the side wall of the third end of the outer filter barrel;

The center of the circular hole is located above the centerline of the filter outer barrel;

The first end of the output pipe section communicates with the first end of the inner filter barrel through the circular hole.

In another possible implementation manner, the output pipe section is fixedly connected with the contact point of the third end of the filter outer barrel;

The second end of the input pipe section is fixedly connected with the contact point of the first end of the filter barrel.

In another possible implementation manner, the centerline of the output pipe section and the centerline of the inner filter barrel are on a straight line.

In another possible implementation manner, the centerline of the filter barrel is parallel to the centerline of the output pipe section, and the centerline of the output pipe section is located above the centerline of the filter barrel.

In another possible implementation manner, the second end of the output pipe section communicates with the flowmeter through slips; or,

The second end of the output pipe section communicates with the flowmeter through a flange.

In another possible implementation manner, the input pipe section is perpendicular to the filter outer barrel, and the input pipe section is located below the filter outer barrel.

In another possible implementation manner, the wire plug has a core hole;

The second end of the filter outer barrel is connected with the first end of the filling hole of the plug, and the second end of the filling hole of the plug is connected with the emptying valve.

In another possible implementation manner, the diameter of the filtering inner barrel is larger than the diameter of the output pipe section.

The beneficial effects brought by the technical solutions provided in the embodiments of the present application are:

The flowmeter cleaning device provided by the embodiment of the present application is arranged between the water injection pipeline and the flowmeter. In the device, the inner filter barrel is located in the outer filter barrel, and one end of the inner filter barrel is communicated with the flowmeter through the output pipe section, and the other end is provided with a detachable filter. connector. Based on the above structure, when cleaning the flowmeter, it is only necessary to remove the inner filter barrel through the detachable joint, and then pass through the outer filter barrel to clean the flowmeter, so that there is no need to disassemble and install the flowmeter, reducing the need for The cleaning operation time is reduced, the labor intensity is reduced, and the cleaning efficiency is improved.

Description of drawings

FIG. 1 is a schematic diagram of a flowmeter cleaning device provided in an embodiment of the present application.

The reference numerals denote:

1-input pipe section, 2-filter outer barrel, 3-filter inner barrel, 4-output pipe section, 5-empty valve, 6-wire plug.

Detailed ways

In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application are further described in detail below.

In the process of oilfield development, water injection is a necessary link. In order to effectively control and measure the water input from each water injection well, a flowmeter is generally installed on the water injection pipeline, and the water flow is measured through the flowmeter. However, since the water injected into the downhole is basically oilfield sewage, the flowmeter is blocked or the flowmeter probe is polluted frequently, resulting in only the sound of water but not the flow of water. At this time, it is necessary to disassemble the flowmeter and clean the flowmeter. At present, when cleaning the flowmeter, it is necessary to stop the water injection operation first, disassemble the flowmeter for cleaning, and then install the cleaned flowmeter on the water injection pipeline. It can be seen that the operation time for cleaning the flowmeter at present is long and labor-intensive, resulting in low cleaning efficiency.

The embodiment of the present application provides a flowmeter cleaning device, referring to FIG. 1 , the device includes: an input pipe section 1 , an outer filter barrel 2 , an inner filter barrel 3 , an output pipe section 4 and an emptying valve 5 ;

The filtering inner barrel 3 is located in the filtering outer barrel 2;

The first end of the input pipe section 1 is communicated with the water injection pipeline through the control valve, the second end of the input pipe section 1 is communicated with the first end of the filter outer barrel 2, and the second end of the filter outer barrel 2 is connected with the emptying valve 5 through the plug 6 Detachable connection;

The first end of the output pipe section 4 passes through the third end of the outer filter barrel 2 and is detachably connected to the first end of the inner filter barrel 3;

The second end of the filter inner barrel 3 is provided with a detachable joint, and the second end of the output pipe section 4 is communicated with the flow meter;

When water is injected through the water injection line, the emptying valve 5 is in a closed state;

When cleaning the flowmeter, the emptying valve 5 is in the open state, and the plug 6 is used to disassemble the emptying valve 5 and separate the emptying valve 5 from the filter outer barrel 2; the detachable joint is used for the emptying valve 5. After being separated from the inner filter barrel 3, the inner filter barrel 3 is disassembled, and the inner filter barrel 3 is separated from the output pipe section 4; the outer filter barrel 2 is used to provide a channel for cleaning the flowmeter.

When water is injected through the water injection pipeline, open the control valve and close the emptying valve 5. The water flows through the input pipeline, the filter outer barrel 2, the filter inner barrel 3, the output pipeline, and the flow meter in turn, and finally enters the oil layer.

The flowmeter cleaning device provided in the embodiment of the present application is arranged between the water injection pipeline and the flowmeter. In the device, the inner filter barrel 3 is located in the outer filter barrel 2, and one end of the inner filter barrel 3 is communicated with the flowmeter through the output pipe section 4, and the other One end is provided with a detachable joint. Based on the above structure, when cleaning the flowmeter, it is only necessary to remove the inner filter barrel 3 through the detachable joint, and then pass through the outer filter barrel 2 to clean the flowmeter, so that there is no need to disassemble and install the flowmeter , reducing the cleaning operation time and labor intensity, thereby improving the cleaning efficiency.

Introduction of the output pipe section 4: In a possible implementation manner, the first end of the output pipe section 4 and the first end of the filter inner barrel 3 may be connected by a thread. In this implementation manner, there is no specific limitation on whether the first end of the output pipe section 4 is provided with an inner thread or an outer thread.

In a possible implementation manner, the first end of the output pipe section 4 is provided with an outer thread, and the first end of the filter inner barrel 3 is provided with an inner thread;

The first end of the output pipe section 4 is communicated with the first end of the filter inner barrel 3 through an outer thread and an inner thread.

In another possible implementation, the first end of the output pipe section 4 may also be provided with an inner thread, the first end of the filter inner barrel 3 is provided with an outer thread, and the first end of the output pipe section 4 is connected to the first end of the filter inner barrel 3 The ends are communicated through an outer thread and an inner thread.

In this implementation, the output pipe section 4 is connected with the filter inner barrel 3 through a thread, and the other end of the filter inner barrel 3 is provided with a detachable joint. Therefore, when the flowmeter is cleaned, the filter can be removed by removing the detachable joint. The inner barrel 3 is disassembled from the output pipe section 4, so that the flowmeter can be cleaned through the filtering outer barrel 2 subsequently.

In a possible implementation manner, the detachable interface may be set and modified as required, which is not specifically limited in this embodiment of the present application. For example, the removable interface may be a wrench mouth. The shape of the wrench mouth can be set and changed as required, for example, the shape of the wrench mouth can be hexagonal or other shapes.

In another possible implementation manner, the first end of the output pipe section 4 and the first end of the filter inner barrel 3 may also be connected by other detachable connection manners. In the embodiments of the present application, this is not specifically limited. For example, the first end of the output pipe section 4 and the first end of the filter inner barrel 3 may be connected by threads. When the first end of the output pipe section 4 and the first end of the filter inner barrel 3 are connected by threads, the first end of the output pipe section 4 may be provided with an external thread, and the first end of the filter inner barrel 3 may be provided with an internal thread; or, the output pipe section 4 The first end of the filter is provided with an internal thread, and the first end of the filter inner barrel 3 is provided with an external thread. In the embodiment of the present application, there is no specific limitation on whether the first end of the output pipe section 4 is provided with an internal thread or an external thread.

In a possible implementation manner, the second end of the output pipe section 4 communicates with the flowmeter through slips; or,

The second end of the output pipe section 4 communicates with the flowmeter through a flange.

In the embodiment of the present application, the communication manner between the second end of the output pipe section 4 and the flow meter is not specifically limited. Wherein, when the communication mode is slip connection, the second end of the output pipe section 4 and the flowmeter can be fixed by a joint, and the joint can be a monk head; when the communication mode is flange connection, the second end of the output pipe section 4 It can be fixed with bolts between the flowmeter.

In a possible implementation manner, the type of the flow meter can be set and changed as required, which is not specifically limited in this embodiment of the present application. In the embodiment of the present application, the communication mode between the flowmeter and the second end of the output pipe section 4 can be adjusted according to the type of the flowmeter.

In a possible implementation manner, the length of the output pipe section 4 can be set and changed as required, which is not specifically limited in the embodiment of the present application.

In a possible implementation manner, the material of the output pipe section 4 can be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the material of the output pipe section 4 is cast iron or an alloy, and the alloy can be stainless steel.

In a possible implementation manner, the diameter of the output pipe section 4 can be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the diameter of the output pipe section 4 may be 100 mm or 120 mm.

Introduction of the input pipe section 1: In a possible implementation manner, the connection mode between the second end of the input pipe section 1 and the first end of the filter barrel 2 can be set and changed as required. This is not specifically limited. For example, the connection mode may be fixed connection, and the fixed connection may be welding.

In a possible implementation manner, the input pipe section 1 and the filter outer barrel 2 are at a certain angle, and the input pipe section 1 is located below the filter outer barrel 2 .

In this implementation manner, the angle between the input pipe section 1 and the filter outer barrel 2 is not specifically limited. For example, the angle is 90°, that is, the input pipe section 1 is perpendicular to the filtering outer barrel 2 , continue referring to FIG. 1 .

In the embodiment of the present application, the input pipe section 1 is perpendicular to the filter outer barrel 2. When water is injected through the water injection pipeline and the water flows through the input pipe section 1, the water flow direction is vertical upward, so that large particles of impurities or other impurities in the water will be removed under the action of gravity. Settling down to avoid entering the flowmeter with the water flow, reducing the occurrence of flowmeter blockage or contamination of the flowmeter probe to a certain extent.

In a possible implementation manner, the length of the input pipe section 1 can be set and changed as required, which is not specifically limited in this embodiment of the present application.

In a possible implementation manner, the material of the input pipe section 1 can be set and changed as required, which is not specifically limited in this embodiment of the present application. For example, the material of the input pipe section 1 is cast iron or an alloy, and the alloy can be stainless steel.

In a possible implementation manner, the diameter of the input pipe section 1 may be set and changed as required, which is not specifically limited in this embodiment of the present application. For example, the diameter of the input pipe section 1 may be 100 mm or 120 mm.

The diameter of the input pipe section 1 and the diameter of the output pipe section 4 may be the same or different, which are not specifically limited in the embodiments of the present application.

In a possible implementation manner, due to the existence of oil layer pressure, the water injection operation is generally a pressurized operation. This places requirements on the pressure bearing capacity of the output pipe section 4 and the pressure bearing capacity of the input pipe section 1 . In the embodiment of the present application, the pressure bearing capacity of the output pipe section 4 and the pressure bearing capacity of the input pipe section 1 can be set and changed as required, which are not specifically limited in the embodiment of the present application. For example, the pressure bearing capacity of the output pipe section 4 is greater than 10Mpa, and the pressure bearing capacity of the input pipe section 1 is greater than 10Mpa.

It should be noted that since the injected water is generally oilfield sewage, the sewage may contain corrosive substances, which may easily corrode the pipeline. Therefore, the input pipe section 1 and the output pipe section 4 can also be treated with anticorrosion. In the embodiments of the present application, the specific manner of the anti-corrosion treatment is not specifically limited.

Introduction of the evacuation valve 5: In a possible implementation manner, the type of the evacuation valve 5 can be set and changed as required, which is not specifically limited in this embodiment of the present application. For example, the emptying valve 5 may be an automatic emptying valve 5 or a mechanical emptying valve 5 .

Introduction of the outer filter barrel 2: In the embodiment of the present application, the outer filter barrel 2 is used to provide a channel for cleaning the flowmeter. When cleaning the flowmeter, after removing the plug 6 and the inner filter barrel 3, the relevant personnel can directly clean the flowmeter through the outer filter barrel 2 without disassembling the flowmeter, which improves the cleaning performance. efficiency.

In a possible implementation manner, a circular hole is provided on the side wall of the third end of the filtering outer tub 2;

The center of the circular hole is located above the center line of the filter outer barrel 2;

The first end of the output pipe section 4 communicates with the first end of the filter inner barrel 3 through the circular hole.

In this implementation, the center of the circular hole is located above the center line of the filter outer barrel 2. During the water injection process, large particles of impurities in the water and welding slag remaining during welding can settle to the bottom of the filter outer barrel 2 under the action of gravity. , instead of entering the output pipe section 4 with the water flow, thereby reducing the occurrence of flowmeter blockage and flowmeter pollution to a certain extent.

The diameter of the circular hole can be set and changed as required, which is not specifically limited in the embodiments of the present application. However, it should be noted that the diameter of the circular hole is larger than the diameter of the output pipe section 4 . For example, if the diameter of the output pipe section 4 is 100 mm, the diameter of the circular hole may be 110 mm or 120 mm.

In a possible implementation manner, the output pipe section 4 is fixedly connected at the contact point with the third end of the outer filter barrel 2;

The contact between the second end of the input pipe section 1 and the first end of the filter outer tub 2 is fixedly connected.

In this implementation, the fixed connection between the output pipe section 4 and the third end of the filter barrel 2 can stabilize the water flow and prevent the output pipe section 4 from moving back and forth when the water flow is large, affecting the measurement of the flowmeter.

The fixed connection mode can be set and changed as required, which is not specifically limited in this embodiment of the present application. For example, the fixed connection can be welding, that is, the contact between the output pipe section 4 and the third end of the filter barrel 2 is welded, and the second end of the input pipe section 1 is welded with the first end of the filter barrel 2 .

In a possible implementation manner, the second end of the outer filter barrel 2 is detachably communicated with the emptying valve 5 through a plug 6 .

In this implementation, the plug 6 is provided with a filling hole; the second end of the filter outer barrel 2 is connected with the first end of the filling hole of the plug 6, and the second end of the filling hole of the plug 6 is connected to the Drain valve 5 thread connection.

In the embodiment of the present application, the inner filter barrel 3 is located in the outer filter barrel 2, and one end of the inner filter barrel 3 is communicated with the flowmeter through the output pipe section 4, and the other end is provided with a detachable joint. Based on the above structure, when cleaning the flowmeter, it is only necessary to remove the emptying valve 5 through the plug 6, then remove the inner filter barrel 3 through the detachable joint, and then pass through the outer filter barrel 2 to control the flow rate. The cleaning operation is carried out by the meter, so that there is no need to disassemble and install the flowmeter, which reduces the cleaning operation time, reduces the labor intensity, and improves the cleaning efficiency.

When the cleaning operation is completed, it is only necessary to align the inner filter barrel 3 with the output pipe section 4, connect the two through the detachable joint, and then connect the emptying valve 5 to the outer filter barrel 2 through the plug 6, and close the emptying. valve 5, and continue to inject water into the oil layer.

In a possible implementation manner, the centerline of the outer filter barrel 2 is parallel to the centerline of the output pipe section 4 , and the centerline of the output pipe section 4 is located above the centerline of the filter outer barrel 2 .

In this implementation, since the centerline of the output pipe section 4 is located above the centerline of the outer filter barrel 2, when the water enters the outer filter barrel 2, the large particles of impurities in the water or the welding slag during welding can be under the action of gravity It will sink to the bottom of the filter outer barrel 2 and not enter the output pipe section 4 with the water flow, thereby reducing the occurrence of flowmeter blockage and flowmeter pollution to a certain extent.

Wherein, the welding slag can be the welding slag at the contact point between the output pipe section 4 and the third end of the filter barrel 2, or the contact between the second end of the input pipe section 1 and the first end of the filter barrel 2 Weld slag during welding. In the embodiments of the present application, this is not specifically limited.

In a possible implementation manner, the length of the filtering outer barrel 2 can be set and changed as required, and the length of the filtering inner barrel 3 can also be set and changed as required, which is not specifically limited in this embodiment of the present application. However, it should be noted that the length of the inner filter barrel 3 is smaller than the length of the outer filter barrel 2 .

In a possible implementation manner, the material of the filtering outer barrel 2 can be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the material of the filter outer tub 2 may be cast iron or an alloy, and the alloy may be stainless steel.

In a possible implementation manner, the shape of the filtering outer barrel 2 can be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the shape of the outer filter barrel 2 is a cylindrical shape or a cone shape.

Introduction of the filter inner barrel 3: In the embodiment of the present application, the filter inner barrel 3 is connected to the output pipe section 4, which can filter large particles of impurities in the water and welding slag during welding, which reduces the occurrence of flowmeter failures to a certain extent.

In a possible implementation manner, the filtering particle size of the filtering inner barrel 3 can be set and changed as required, which is not specifically limited in the embodiment of the present application. For example, the filter particle size can be 60 mesh or 100 mesh.

In a possible implementation manner, the inner filter barrel 3 and the outer filter barrel 2 can also be cleaned regularly or irregularly, and the pollutants and large particles of impurities in the outer filter barrel 2 can be removed in time to reduce the blockage of the flowmeter to a certain extent. or the occurrence of contamination of the flowmeter probe.

In a possible implementation manner, the material of the filtering inner barrel 3 may be set as required, which is not specifically limited in this embodiment of the present application. For example, the material of the filter inner barrel 3 may be cast iron or an alloy, and the alloy may be stainless steel.

Wherein, the material of the filtering outer barrel 2 and the material of the filtering inner barrel 3 may be the same or different, which are not specifically limited in the embodiments of the present application. For example, the material of the filter outer barrel 2 is the same as that of the filter inner barrel 3, and both are stainless steel.

In a possible implementation manner, the shape of the filtering inner barrel 3 can be set and changed as required, which is not specifically limited in this embodiment of the present application. For example, the shape of the filter inner barrel 3 is a cylindrical shape or a conical barrel shape.

The shape of the inner filter barrel 3 and the shape of the outer filter barrel 2 may be the same or different. In the embodiments of the present application, this is not specifically limited. For example, the shape of the inner filter barrel 3 and the shape of the outer filter barrel 2 are the same, and both are cylindrical.

In a possible implementation manner, the centerline of the output pipe section 4 and the centerline of the filter inner barrel 3 are on a straight line.

In this implementation, the centerline of the output pipe section 4 and the centerline of the filter inner barrel 3 are concentrically arranged to make the water flow stable and facilitate the flowmeter to accurately measure the water flow.

In a possible implementation manner, the diameter of the filtering inner barrel 3 is larger than the diameter of the output pipe section 4 . The diameter of the filter inner barrel 3 can be set and changed as needed, and the diameter of the output pipe section 4 can also be set and changed as needed, which are not specifically limited in the embodiments of the present application. For example, the diameter of the filtering inner barrel 3 is 90 mm, and the diameter of the output pipe section 4 is 80 mm.

The flowmeter cleaning device provided in the embodiment of the present application is arranged between the water injection pipeline and the flowmeter. In the device, the inner filter barrel 3 is located in the outer filter barrel 2, and one end of the inner filter barrel 3 is communicated with the flowmeter through the output pipe section 4, and the other One end is provided with a detachable joint. Based on the above structure, when cleaning the flowmeter, it is only necessary to remove the emptying valve 5 through the plug 6, then remove the inner filter barrel 3 through the detachable joint, and then pass through the outer filter barrel 2 to control the flow rate. The cleaning operation is carried out by the meter, so that there is no need to disassemble and install the flowmeter, which reduces the cleaning operation time, reduces the labor intensity, and improves the cleaning efficiency.

In addition, due to its simple and reliable cleaning operation method, the cleaning is more timely, and the situation of only hearing the sound of water but not the flow caused by the blockage of the flowmeter is eliminated to the greatest extent, which provides a guarantee for accurate water injection and accurate water injection in the oil field.

In addition, installing the flowmeter cleaning device between the flowmeter and the water injection pipeline can also filter the impurities in the sewage, effectively solving the influence of the poor injected water quality on the water flow measured by the flowmeter, and greatly reducing the failure of the flowmeter. The occurrence of flowmeter reduces the failure rate of flowmeter blockage, reduces labor intensity to a certain extent, and reduces the flowmeter's requirements for water quality.

Furthermore, installing a flowmeter cleaning device between the water injection pipeline and the flowmeter can also simplify the welding process of the wellhead process. The original process is to weld a straight pipe section on an elbow, and weld a joint connected to the control valve under the straight pipe section. First weld a straight pipe section at the horizontal end of the elbow, weld a reducing pipe fitting at the other end of the straight pipe section, and weld a straight pipe section with a connector connected to the flowmeter at one end at the other end of the reducing pipe fitting. It can be seen that the welding process is cumbersome. Now, these processes and devices are replaced by the flowmeter cleaning device provided in the embodiment of the present application, which reduces the welding labor intensity to a certain extent.

The above descriptions are only for the convenience of those skilled in the art to understand the technical solutions of the present application, and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. A flowmeter cleaning device, characterized in that the device comprises: an input pipe section, an outer filter barrel, an inner filter barrel, an output pipe section and an emptying valve; the filtering inner barrel is located in the filtering outer barrel; The first end of the input pipe section is communicated with the water injection pipeline through a control valve, the second end of the input pipe section is communicated with the first end of the filter outer barrel, and the second end of the filter outer barrel is communicated with the emptying The valve is detachably connected through the plug; The first end of the output pipe section passes through the third end of the outer filter barrel and is detachably connected to the first end of the inner filter barrel; The second end of the filter inner barrel is provided with a detachable joint, and the second end of the output pipe section is communicated with the flow meter; When water is injected through the water injection line, the emptying valve is in a closed state; When the flowmeter is cleaned, the evacuation valve is in an open state, and the plug is used to disassemble the evacuation valve and separate the evacuation valve from the filter outer barrel; The disassembly joint is used to disassemble the filter inner barrel after the emptying valve is separated from the filter inner barrel, and separate the filter inner barrel from the output pipe section; the filter outer barrel is used to provide the flow The channel through which cleaning operations are performed. 2. The device according to claim 1, wherein the first end of the output pipe section is provided with an outer thread, and the first end of the filter inner barrel is provided with an inner thread; The first end of the output pipe section is communicated with the first end of the inner filter barrel through the outer thread and the inner thread. 3. The device according to claim 1, wherein a circular hole is provided on the side wall of the third end of the filtering outer barrel; The center of the circular hole is located above the centerline of the filter outer barrel; The first end of the output pipe section communicates with the first end of the inner filter barrel through the circular hole. 4. The device according to claim 3, wherein the output pipe section is fixedly connected to the contact point of the third end of the filter outer barrel; The second end of the input pipe section is fixedly connected with the contact point of the first end of the filter barrel. 5 . The device according to claim 1 , wherein the center line of the output pipe section and the center line of the inner filter barrel are on a straight line. 6 . 6. The device according to claim 5, wherein the centerline of the filter barrel is parallel to the centerline of the output pipe section, and the centerline of the output pipe section is located on the centerline of the filter barrel above. 7. The device according to claim 1, wherein the second end of the output pipe section communicates with the flowmeter through slips; or, The second end of the output pipe section communicates with the flowmeter through a flange. 8 . The device according to claim 1 , wherein the input pipe section is perpendicular to the filter outer barrel, and the input pipe section is located below the filter outer barrel. 9 . 9. The device according to claim 1, wherein the wire plug is provided with a core hole; The second end of the filter outer barrel is connected with the first end of the filling hole of the plug, and the second end of the filling hole of the plug is connected with the emptying valve. 10. The device according to claim 1, wherein the diameter of the filter inner barrel is larger than the diameter of the output pipe section.

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