Cleaning filter for dirt returned from bottom of natural gas well

Abstract

The utility model discloses a cleaning filter for returning dirt at the bottom of a natural gas well, which comprises a filter cartridge, a dirt inlet, a liquid outlet, a filter screen, a top cover mechanism and a dirt outlet, the top cover mechanism seals the opening of the filter cartridge, and the distance between the dirt inlet and the top cover mechanism is larger than the distance between the liquid outlet and the top cover mechanism. The filter screen extends in the axial direction of the filter cartridge, one end of the filter screen is connected with the cartridge bottom of the filter cartridge, the other end of the filter screen extends towards the top cover mechanism, and the waste discharge port is located in the bottom of the filter cartridge. According to the utility model, the filter screen is vertically arranged, the filter cartridge is axially divided into the independent sediment chamber and the independent liquid discharge chamber, the structure that dirt enters from the lower part and exits from the upper part is combined, solid substances automatically settle, liquid is discharged through the filter screen, sediments are discharged from the bottom, the filter screen does not need to bear the solid substances, and residual blockages on the filter screen are greatly reduced; and the replacement or cleaning time period of the filter screen is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering dirt returned from the bottom of a well in natural gas exploitation, in particular to a cleaning filter for dirt returned from the bottom of a natural gas well. Background Art

[0002] The pollutants returned from the bottom of the natural gas well can be divided into two categories: inorganic and organic. The inorganic components are FeS, Fe3O4, and SiO2, which are mainly corrosion products of downhole oil casing; the organic components are benzene series and esters, which are mainly well fluid or carbon fiber coating of oil pipe. When these pollutants enter the pipeline or equipment, some of them will adhere to the pipe wall or the equipment cylinder and internal components, and cannot be discharged in time, causing the downstream equipment to fail to operate normally.

[0003] At present, filters are mostly used to filter dirt, but the filter screen of the existing filter is set in the filter cartridge, and the dirt enters from the top entrance of the filter and is filtered through the filter screen. This will cause solid dirt to be concentrated on the filter screen, which will cause the filter screen to be blocked in a short period of time, and the filter screen needs to be taken out frequently for cleaning or replacement.

[0004] In view of this, this patent application is filed. Utility Model Content

[0005] The utility model aims to provide a cleaning filter for returning dirt from the bottom of a natural gas well, so as to solve the technical problem that the dirt currently fills up the filter in a short time and needs to be frequently taken out for replacement or cleaning.

[0006] The utility model is realized by the following technical solutions:

[0007] A cleaning filter for waste returned from the bottom of a natural gas well, comprising a filter cartridge, a sewage inlet, a liquid outlet, a filter screen, a top cover mechanism, and a sewage outlet, wherein the top cover mechanism seals the opening of the filter cartridge, the distance between the sewage inlet and the top cover mechanism is greater than the distance between the liquid outlet and the top cover mechanism, the filter screen is extended and arranged along the axial direction of the filter cartridge, one end of the filter screen is connected to the bottom of the filter cartridge, and the other end extends toward the direction of the top cover mechanism, and the waste outlet is located at the bottom of the filter cartridge.

[0008] The filter screen in the utility model is arranged vertically, and the filter cylinder is divided into independent sediment chamber and liquid discharge chamber along the axial direction. Combined with the low-in and high-out structure, the solid matter in the dirt will automatically settle at the bottom of the filter cylinder due to its own gravity and concentrate in the sediment chamber, while the liquid enters the liquid discharge chamber through the filter screen and is then discharged from the liquid outlet, and the sediment is discharged from the bottom. In this way, the filter screen mainly plays the role of isolating solid and liquid, and does not need to carry solid matter, which greatly reduces the remaining blockage on the filter screen and greatly prolongs the time cycle for replacing or cleaning the filter screen.

[0009] In an optional embodiment, a baffle is fixedly provided at one end of the filter screen close to the top cover mechanism, and the baffle is arranged in a radial direction parallel to the filter cylinder. The side of the baffle fits tightly against the inner wall of the filter cylinder to form a liquid flow space between the baffle, the filter screen and the filter cylinder.

[0010] In an optional embodiment, the baffle is a filter structure.

[0011] In an optional embodiment, the diameter of the baffle is equal to the radius of the filter cartridge.

[0012] In an optional embodiment, a fixing frame is fixedly provided on the outside of the baffle and the filter screen, and the fixing frame is fixedly installed on the inner wall of the filter cylinder. The baffle is semicircular, and the filter screen is a semicircular arc structure.

[0013] In an optional embodiment, the top cover mechanism adopts a quick-opening blind plate structure.

[0014] In an optional embodiment, an electric ball valve is provided on the sewage pipe at the sewage outlet.

[0015] In an optional embodiment, a liquid level gauge is provided in the middle of the filter cartridge, and the liquid level gauge is arranged along the central axis direction of the filter cartridge.

[0016] In an optional embodiment, the filter cartridge is further provided with a pressure relief pipe, and the pressure relief pipe is provided with a pressure gauge.

[0017] In an optional embodiment, the cylinder is further provided with a self-cleaning interface, and the self-cleaning interface is connected to a cleaning liquid source.

[0018] The advantages and beneficial effects of the utility model compared to the prior art are:

[0019] The utility model provides a cleaning filter for the dirt returned from the bottom of a natural gas well. The filter screen is arranged vertically, and the filter cylinder is divided into an independent sediment chamber and a drainage chamber along the axial direction. Combined with the structure of low-input and high-output of dirt, the solid matter in the dirt will automatically settle at the bottom of the filter cylinder due to its own gravity and concentrate in the sediment chamber, while the liquid enters the drainage chamber through the filter screen and is then discharged from the liquid outlet, and the sediment is discharged from the bottom. In this way, the filter screen mainly plays the role of isolating solid and liquid states, and does not need to carry solid matter, which greatly reduces the remaining blockages on the filter screen and greatly prolongs the time cycle for replacing or cleaning the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0021] Figure 1 A schematic structural diagram of a cleaning filter for waste returned from the bottom of a natural gas well provided in an embodiment of the utility model.

[0022] Figure 2 The present invention is a schematic top view of a cleaning filter for waste returned from the bottom of a natural gas well provided in an embodiment of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the baffle and the fixed frame matching each other.

[0024] Figure 4 It is a structural schematic diagram of the matching of the filter screen and the fixed frame.

[0025] Marks and corresponding parts names in the attached drawings:

[0026] 1-filter cartridge, 2-sewage inlet, 3-liquid outlet, 4-filter screen, 5-top cover mechanism, 6-sewage outlet, 7-baffle, 8-fixed frame, 9-electric ball valve, 10-liquid level gauge, 11-pressure relief pipe, 12-pressure gauge, 13-self-cleaning interface. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the utility model and their descriptions are only used to explain the utility model and are not intended to limit the utility model.

[0028] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, in order to avoid confusing the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0029] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0031] like Figure 1~2 As shown in the figure, a cleaning filter for waste returned from the bottom of a natural gas well comprises a filter cartridge 1, a waste inlet 2, a liquid outlet 3, a filter screen 4, a top cover mechanism 5, and a waste outlet 6.

[0032] The filter cartridge 1 can be a cylindrical structure, which is used to contain impurities such as liquid and solid suspended matter flowing in from the separator. The filter cartridge 1 has an opening at the top, and the top cover mechanism 5 seals the opening of the filter cartridge 1 at the top of the filter cartridge 1. The distance between the sewage inlet 2 and the top cover mechanism 5 is greater than the distance between the liquid outlet 3 and the top cover mechanism 5. The height of the sewage inlet 2 is lower than the height of the liquid outlet 3, and a low-in and high-out structure is adopted. The filter screen 4 is arranged to extend along the axial direction of the filter cartridge 1, one end of the filter screen 4 is connected to the filter cartridge 1, and the other end extends toward the direction of the top cover mechanism 5. The use of the filter screen 4 can prevent impurities from entering the downstream steam trap. The waste outlet is located at the bottom of the filter cartridge 1.

[0033] Unlike the existing filter screen 4 which is arranged along the radial direction of the filter cartridge 1, the filter screen 4 in this embodiment is arranged axially and vertically, so that the filter cartridge 1 is divided into independent sediment chamber and drainage chamber along the axial direction. Combined with the low-in and high-out structure of the incoming dirt, the solid matter in the dirt will automatically settle at the bottom of the filter cartridge 1 due to its own gravity and concentrate in the sediment chamber, while the liquid enters the drainage chamber through the filter screen 4 and is then discharged from the liquid outlet 3. After a certain period of time, the sediment is discharged from the sewage outlet 6 at the bottom. In this way, the filter screen 4 mainly plays the role of isolating solid and liquid states, and does not need to carry solid matter, which greatly reduces the blockage on the filter screen 4. The time cycle for replacing or cleaning the filter screen 4 is greatly extended.

[0034] Furthermore, in order to better prevent solid matter from entering the drainage chamber, a baffle 7 is fixedly provided at one end of the filter screen 4 close to the top cover mechanism 5. The baffle 7 is arranged in a radial direction parallel to the filter cylinder 1 and is vertically connected to the filter screen 4. The baffle 7 can be integrally formed with the filter screen 4. The outer peripheral surface of the baffle 7 fits tightly against the inner wall of the filter cylinder 1, so that there is no gap between the contact surface of the baffle 7 and the filter cylinder 1, so that a liquid flow space is formed between the baffle 7, the filter screen and the filter cylinder 1, and this liquid flow space is the drainage chamber. At the same time, there is a spacing between the baffle 7 and the top cover mechanism 5, which can accommodate more dirt. By setting the baffle 7, solid dirt can be intercepted at the top to prevent it from entering the drainage chamber.

[0035] Preferably, the baffle 7 is designed as a filter structure, and the diameter of the baffle 7 is equal to the radius of the filter cartridge 1, so that more accommodation space is reserved, and the liquid reaching the top of the baffle 7 can also enter the drainage chamber.

[0036] Furthermore, the baffle 7 and the filter screen are both fixedly provided with a fixing frame on the outside, and the fixing frame is fixedly installed on the inner wall of the filter cylinder, the baffle is a semicircular mesh plate structure, and the filter screen is also a semicircular arc mesh plate structure. By setting the fixing frame 8, the filter screen 4 and the baffle 7 can be fixed, and the removal and replacement of the filter screen 4 and the baffle 7 are convenient. The baffle 7 is fixed to the fixing frame outside the filter screen 4, and can also be set as an integrally formed structure.

[0037] Embodiment 2:

[0038] On the basis of Example 1, the top cover mechanism 5 is provided with a quick-open blind plate structure. The top cover mechanism 5 as a whole can preferably adopt a buckle-type quick-open blind plate, such as the buckle-type quick-open blind plate produced by Heilongjiang Liandun Petrochemical Equipment Co., Ltd. The quick-open blind plate can be used to quickly open the filter cartridge 1. Compared with the existing method of fixing the cover plate at the filter cartridge 1 with bolts, this embodiment can be quickly opened to achieve quick removal of the filter screen 4, and also facilitate quick cleaning of the filter screen 4.

[0039] An electric ball valve 9 is also provided on the sewage pipe at the sewage outlet 6 to control the opening and closing of the sewage outlet 6, and can be automatically opened according to the set discharge cycle.

[0040] A liquid level gauge 10 is also provided in the middle of the filter cartridge 1 . The liquid level gauge 10 is arranged along the central axis of the filter cartridge 1 and is used to monitor the height of the liquid level in the cartridge to determine the blockage of the filter screen and the amount of dirt in the filter cartridge 1 .

[0041] The filter cartridge 1 is also provided with a pressure relief pipe 11 , on which a pressure gauge 12 is provided for monitoring the pressure in the cartridge to provide a basis for pressure relief. Pressure relief can also be performed when the filter screen 4 is taken out.

[0042] When the filter screen 4 needs to be cleaned, a self-cleaning interface 13 can be provided on the filter cartridge for more convenient operation. The self-cleaning interface 13 is connected to an external cleaning liquid source through a pipeline, such as a separator containing pressurized liquid. The purpose of providing the self-cleaning interface 13 is mainly to use the pressurized liquid of the separator to perform all-round cleaning of the inner wall of the cartridge and the filter screen without opening the quick-opening blind plate.

[0043] The filter of the utility model has the following technical advantages:

[0044] 1. The axial arrangement + radial arrangement of the filter structure can effectively intercept slag and floccules. The settling chamber isolated by the filter structure can effectively settle solid matter, thereby greatly reducing the entry of various debris into the downstream steam trap.

[0045] 2. This filter has a large settling chamber and is equipped with a special sewage outlet 6. During normal operation, the dirt at the bottom of the filter can be discharged regularly and regularly through the electric ball valve 9 of the sewage outlet 6 without opening the quick-opening blind plate.

[0046] 3. The filter is provided with a liquid level meter 10 to monitor the clogging condition of the filter screen. (When the liquid level in the cylinder rises to the liquid outlet 3 of the device after regular sewage discharge, it means that the filter screen is seriously clogged.)

[0047] 4. When the filter is seriously clogged, open the quick-open blind plate and take out the filter for cleaning.

[0048] 5. The pipelines of sewage inlet 2 and liquid outlet 3 adopt a low-in and high-out mode to facilitate the sedimentation and separation of sewage.

[0049] 6. The filter is easy to clean. When the filter needs to be cleaned, just open the quick-open blind plate and take out the filter for cleaning.

[0050] 7. The self-cleaning interface 13 can be used to use pressurized liquid from a separator to achieve all-round cleaning of the inner wall of the cylinder and the filter without opening the quick-opening blind plate.

[0051] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above are only specific implementation methods of the utility model and are not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A cleaning filter for waste returned from the bottom of a natural gas well, characterized in that: The filter comprises a filter cartridge, a sewage inlet, a liquid outlet, a filter screen, a top cover mechanism, and a sewage outlet, wherein the top cover mechanism seals the opening of the filter cartridge, the distance between the sewage inlet and the top cover mechanism is greater than the distance between the liquid outlet and the top cover mechanism, the filter screen is extended and arranged along the axial direction of the filter cartridge, one end of the filter screen is connected to the bottom of the filter cartridge, and the other end extends toward the direction of the top cover mechanism, and the sewage outlet is located at the bottom of the filter cartridge.

2. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 1, characterized in that: A baffle is fixedly provided at one end of the filter screen close to the top cover mechanism. The baffle is arranged in a radial direction parallel to the filter cartridge. The side of the baffle fits tightly against the inner wall of the filter cartridge to form a liquid flow space between the baffle, the filter screen and the filter cartridge.

3. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 2, characterized in that: The baffle is a filter structure.

4. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 2 or 3, characterized in that: The diameter of the baffle is equal to the radius of the filter cartridge.

5. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 4, characterized in that: A fixing frame is fixedly provided on the outside of the baffle and the filter screen. The fixing frame is fixedly installed on the inner wall of the filter cylinder. The baffle is semicircular and the filter screen is a semicircular arc structure.

6. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 5, characterized in that: The top cover mechanism adopts a quick-opening blind plate structure.

7. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 5, characterized in that: An electric ball valve is arranged on the sewage pipe at the sewage outlet.

8. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 7, characterized in that: A liquid level gauge is provided in the middle of the filter cartridge, and the liquid level gauge is arranged along the central axis direction of the filter cartridge.

9. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 8, characterized in that: The filter cartridge is also provided with a pressure relief pipe, and the pressure relief pipe is provided with a pressure gauge.

10. A cleaning filter for waste returned from the bottom of a natural gas well according to claim 9, characterized in that: The filter cartridge is also provided with a self-cleaning interface, which is connected to a cleaning liquid source.

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