Backwash filter for oilfield water injection

Abstract

The utility model relates to a backwash filter for oilfield water injection, which belongs to the technical field of oilfield water injection and is characterized in that a shell is arranged on a filter body and fixedly connected with the filter body, and a guide groove is arranged on the inner side of the shell; the filter cartridge is arranged in the shell and comprises a top connecting cover, a filter cartridge body and a bottom connecting cover, the top connecting cover is in threaded connection with the filter cartridge body, and the filter cartridge body is fixedly connected with the bottom connecting cover; the top connecting cover and the bottom connecting cover are slidably connected with the guide grooves through guide blocks on the outer sides. A plurality of layers of filter elements are arranged in the filter cylinder body, and at least one layer of filter element is detachably connected with the filter cylinder body; a plurality of filtering channels are arranged on each layer of filter element at intervals, and the sizes of the filtering channels are sequentially reduced from outside to inside; the protective cover is in threaded connection with the shell, and connection threads of the protective cover and the shell are round-like threads. According to the utility model, the filter quality is improved by arranging a plurality of layers of filter elements, and the filter elements are cleaned or replaced by taking out the filter cartridges, so that the cleaning and regeneration of the filter elements are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield water injection, and particularly relates to a backwashing filter for oilfield water injection. Background Technique

[0002] The reinjection of oilfield sewage is an effective means to achieve energy conservation and emission reduction. However, after the reinjected water is transported over a long distance through pipelines, the suspended solids and oil content in it increase, resulting in poor water quality and having an adverse impact on reinjection. To meet the requirements of sewage reinjection, a backwashing filter is often used. A backwashing filter is a water treatment device that uses a filtering medium to intercept impurities in water to purify water quality. Its main advantage lies in using the water flowing in the reverse direction to wash the pollutants accumulated on the filtering medium.

[0003] When water passes through the backwashing filter, pollutants are intercepted in the filtering medium, and the clean water enters the reinjection system after filtration. During the oilfield development process, the water quality will change. Especially in the later stage of oilfield development, for example, the proportion of oil contained in the produced water of the oilfield is relatively high. However, the filter cartridge or filter element part of the existing filtering medium only has a filtering effect on large particle impurities and has insufficient filtering ability for oil. Content of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a backwashing filter for oilfield water injection. The technical problems to be solved by the utility model are realized through the following technical solutions:

[0005] The utility model provides a backwashing filter for oilfield water injection, including: a filter body, which is respectively connected to a backwashing valve, a first connecting pipe and a second connecting pipe; a shell, which is arranged on the filter body and fixedly connected, and guide grooves are relatively arranged along the vertical direction on the inner side of the shell; a filter cartridge, which is arranged in the shell and includes: a top connection cover, a filter cylinder body and a bottom connection cover, the top connection cover is threadedly connected to the filter cylinder body, and the filter cylinder body is fixedly connected to the bottom connection cover; top guide blocks are relatively arranged on the outer side of the top connection cover, and bottom guide blocks are relatively arranged on the outer side of the bottom connection cover; all the top guide blocks and all the bottom guide blocks are respectively slidably connected to the corresponding guide grooves; several layers of filter elements are sequentially arranged from the outside to the inside in the filter cylinder body, and at least one layer of filter element is detachably connected to the filter cylinder body; several filtering channels are arranged at intervals on each layer of filter element to adsorb impurities, and the sizes of the filtering channels of several layers of filter elements from the outside to the inside decrease in sequence; a protective cover, which is threadedly connected to the shell, wherein the connection thread between the shell and the protective cover is a quasi-circular thread.

[0006] In an embodiment of the utility model, the top connection cover includes: a top cover plate, a connection part and connection screws, wherein the top cover plate is arranged on the connection part and is detachably connected to the connection part through the connection screws; the connection part is threadedly connected to the filter cylinder body.

[0007] In an embodiment of the present utility model, the upper end of the outermost filter element is threadedly connected to the connecting portion, and the lower end is fixedly connected to the bottom connecting cover. The upper ends of all the remaining filter elements are detachably connected to the top connecting cover, and the lower ends are detachably connected to the bottom connecting cover.

[0008] In an embodiment of the present utility model, the filter cartridge further includes a rubber sealing ring; an extending positioning portion is provided on the top cover plate, the rubber sealing ring is sleeved outside the extending positioning portion, and both ends of the rubber sealing ring in the vertical direction are respectively abutted between the top cover plate and the protective cover to fix the filter cartridge on the filter body.

[0009] In an embodiment of the present utility model, the range of the thread profile angle α of the connection thread between the housing and the protective cover is: 50° ≤ α ≤ 55°, the range of the lead angle β is: 50° ≤ β ≤ 60°, and the range of the thread load surface profile angle γ is: -5° ≤ γ ≤ 0°.

[0010] In an embodiment of the present utility model, both the crest and the root of the connection thread between the housing and the protective cover are arc-shaped, and the range of the radius r of the arc is: 0.2 mm ≤ r ≤ 0.3 mm.

[0011] In an embodiment of the present utility model, the taper of the connection thread of the meshing part between the housing and the protective cover is 1:16.

[0012] In an embodiment of the present utility model, the backwashing valve is a ball valve, and the inside or outside of the filter body and the filter cartridge are communicated through the backwashing valve.

[0013] In an embodiment of the present utility model, the backwashing filter for oilfield water injection further includes a foot support, and the foot support is threadedly connected to the lower end of the filter body.

[0014] In an embodiment of the present utility model, the housing and the protective cover are hermetically connected through a sealing ring; the filter body and the filter cartridge are hermetically connected through a sealing ring.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] The backwashing filter for oilfield water injection of the present utility model is provided with several layers of filter elements in the filter cartridge body. By setting several layers of filter elements, the filtration quality is improved, and it is suitable for the characteristics of the water quality that is prone to change during the oilfield development process. A guiding groove is provided in the housing and is slidably connected to the filter cartridge; and at least one layer of filter element in the filter cartridge is detachable. By taking out the filter cartridge to clean the dirty filter element or replace the filter element, the cleaning and regeneration of the filter element are realized, the water quality of the oilfield reinjected water is guaranteed, and the sewage utilization rate is improved. At the same time, the maintenance pressure is reduced, the service life is extended, and the practicability and flexibility of the equipment are improved.

[0017] The above description is only an overview of the technical solution of the present utility model. In order to understand the technical means of the present utility model more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings. Brief Description of the Drawings

[0018] Figure 1 FIG. is a schematic structural diagram of an anti-backwashing filter for oilfield water injection provided by an embodiment of the present utility model;

[0019] Figure 2 FIG. is a partial structural schematic diagram of a housing provided by an embodiment of the present utility model;

[0020] Figure 3 FIG. is a schematic structural diagram of a filter cartridge provided by an embodiment of the present utility model;

[0021] Figure 4 FIG. is a sectional view of the structure of a filter cartridge provided by an embodiment of the present utility model;

[0022] Figure 5 FIG. is a schematic diagram of a protective cover and a housing being threadedly engaged;

[0023] Figure 6 FIG. is a schematic diagram of the thread profile of a protective cover and a housing provided by an embodiment of the present utility model.

[0024] Reference Signs: 1 - filter body; 2 - housing; 21 - guide groove; 3 - filter cartridge; 31 - top connection cover; 311 - top cover plate; 312 - connection part; 313 - extended positioning part; 314 - top guide block; 315 - connection screw; 32 - filter cylinder body; 321 - filter element; 33 - bottom connection cover; 331 - bottom guide block; 34 - rubber sealing ring; 4 - protective cover; 5 - backwashing valve; 6 - first connecting pipe; 7 - second connecting pipe; 8 - foot support; 10 - tooth crest; 20 - tooth root. Detailed Description of the Preferred Embodiments

[0025] In order to further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following provides a detailed description of an anti-backwashing filter for oilfield water injection according to the present utility model in conjunction with the accompanying drawings and specific embodiments.

[0026] The foregoing and other technical contents, features and effects of the present utility model will be clearly presented in the following detailed description in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present utility model to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and illustration, and are not used to limit the technical solutions of the present utility model.

[0027] Embodiment 1

[0028] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in, this embodiment provides a backwashing filter for oilfield water injection, including: a filter body 1, which is respectively connected to a backwash valve 5, a first connecting pipe 6 and a second connecting pipe 7; a housing 2, which is arranged on the filter body 1 and fixedly connected, and guide grooves 21 are oppositely arranged along the vertical direction on the inner side of the housing 2; a filter cartridge 3, which is arranged in the housing 2, including: a top connecting cover 31, a filter cylinder body 32 and a bottom connecting cover 33, the top connecting cover 31 is threadedly connected to the filter cylinder body 32, and the filter cylinder body 32 is fixedly connected to the bottom connecting cover 33; top guide blocks 314 are oppositely arranged on the outer side of the top connecting cover 31, and bottom guide blocks 331 are oppositely arranged on the outer side of the bottom connecting cover 33; all the top guide blocks 314 and all the bottom guide blocks 331 are respectively slidably connected to the corresponding guide grooves 21; several layers of filter elements 321 are sequentially arranged in the filter cylinder body 32 from outside to inside, and at least one layer of filter element 321 is detachably connected to the filter cylinder body 32; several filter channels are spacedly arranged on each layer of filter element 321 to adsorb impurities, and the sizes of the filter channels of several layers of filter elements 321 from outside to inside decrease in sequence; a protective cover 4, which is threadedly connected to the housing 2, wherein the connection thread between the housing 2 and the protective cover 4 is a quasi-circular thread.

[0029] In an optional embodiment, the backwash valve 5 is a ball valve, and the inside or outside of the filter body 1 and the filter cartridge 3 are communicated through the backwash valve 5. Specifically, by controlling the backwash valve 5, the outside of the filter body 1 and the filter cartridge 3 can be communicated to achieve filtration; by controlling the backwash valve 5, the inside of the filter body 1 and the filter cartridge 3 can be communicated to achieve backwashing.

[0030] In an optional embodiment, the backwashing filter for oilfield water injection further includes: a footrest 8, the footrest 8 is threadedly connected to the lower end of the filter body 1 for support. Optionally, the length of the footrest 8 is adjustable.

[0031] In an optional embodiment, as Figure 3 and Figure 4As shown, the top connection cover 31 includes: a top cover plate 311, a connection part 312, and connection screws 315. Among them, the top cover plate 311 is arranged on the connection part 312 and is detachably connected to the connection part 312 through the connection screws 315; the connection part 312 is threadedly connected to the filter cylinder 32.

[0032] In an alternative embodiment, as Figure 4 shown, the upper end of the outermost filter element 321 is threadedly connected to the connection part 312, and the lower end is fixedly connected to the bottom connection cover 33. The upper ends of all the remaining filter elements 321 are detachably connected to the top connection cover 31, and the lower ends are detachably connected to the bottom connection cover 33. Exemplarily, the lower end of the outermost filter element 321 is welded to the bottom connection cover 33. A ring-shaped connection groove is provided at the lower end of the top connection cover 31, and the upper ends of all the filter elements 321 are arranged in the ring-shaped connection groove.

[0033] In an alternative embodiment, as Figure 4 shown, an extension part is provided at the lower end of the bottom connection cover 33, and the filter body 1 is connected through the extension part.

[0034] In an alternative embodiment, the housing 2 and the protective cover 4 are hermetically connected through a sealing ring; the filter body 1 and the filter cartridge 3 are hermetically connected through a sealing ring. Optionally, the sealing ring can be an O-ring rubber sealing ring, which is coaxially sleeved outside the extension part of the bottom connection cover 33.

[0035] It should be noted that the number and type of the filter elements 321 are not limited in this embodiment. This is because the water quality will change during the oilfield development process, especially in the later stage of oilfield development, and the water quality changes more frequently. Therefore, in this embodiment, several layers of filter elements 321 are provided, and at least one layer of the filter elements 321 is detachable, so as to be replaced according to the water quality change situation, improving the practicability and adaptability.

[0036] Exemplarily, larger filter holes are provided outside the outermost filter element 321 for filtering solid impurities. The filter elements 321 inside it can be small-hole filter elements, and the innermost filter element 321 can be an oil filter net, on which fine mesh holes or strip-shaped gaps are provided for adsorbing oil and other organic polymers. Optionally, there can be a gap or close arrangement between two adjacent layers of filter elements 321. Further, the filter channels of two adjacent layers of filter elements 321 can be arranged at intervals, such as being offset from each other, and the offset part can be provided with large mesh holes, which can improve the oil filtering effect while avoiding blockage and ensuring normal passage and filtering efficiency. In addition, the innermost oil filter net can also be several layers, and an oil filtering medium of other materials, such as a nylon mesh plate or activated carbon, can be clamped between several layers of oil filter nets.

[0037] In an alternative embodiment, as Figure 4As shown, the filter cartridge 3 further includes: a rubber sealing ring 34; an extended positioning portion 313 is provided on the top cover plate 311, the rubber sealing ring 34 is sleeved outside the extended positioning portion 313, and the two ends of the rubber sealing ring 34 in the vertical direction respectively abut between the top cover plate 311 and the protective cover 4 to fix the filter cartridge 3 on the filter body 1.

[0038] Exemplarily, the extended positioning portion 313 of the top cover plate 311 and the extended portion of the bottom connection cover 33 are coaxially arranged. Further, the central axes of the extended positioning portion 313, the extended portion, and the filter cartridge body 32 coincide with each other.

[0039] In an alternative embodiment, as Figure 6 shown, the thread profile angle α of the connection thread between the housing 2 and the protective cover 4 ranges from 50° ≤ α ≤ 55°, the lead angle β ranges from 50° ≤ β ≤ 60°, and the thread load-bearing surface profile angle γ ranges from -5° ≤ γ ≤ 0°. The range of the thread load-bearing surface profile angle γ enables it to have a self-locking ability, has good anti-slip performance under axial load, and retains the sealing performance of the round thread.

[0040] In an alternative embodiment, as Figure 6 shown, the thread crest 10 and the thread root 30 of the connection thread between the housing 2 and the protective cover 4 are both arc-shaped, and the radius r of the arc ranges from 0.2 mm ≤ r ≤ 0.3 mm.

[0041] In an alternative embodiment, as Figure 6 shown, the thread height h of the connection thread between the housing 2 and the protective cover 4 ranges from 1.7 mm ≤ h ≤ 2.3 mm.

[0042] In an alternative embodiment, as Figure 5 shown, the taper of the connection thread of the meshing portion between the housing 2 and the protective cover 4 is 1:16. Further, the connection thread of the protective cover 4 can adopt a single-segment taper structure, while the meshing portion of the housing 2 can adopt a multi-segment taper structure. Among them, the taper of the connection thread of the meshing portion l1 is 1:16, and the taper of the connection thread of the non-meshing portion l2 is 1:20.

[0043] Exemplarily, the thread profile angle α is 52°, the lead angle β is 55°, the thread load-bearing surface profile angle γ is -3°, the thread height h is 1.9 mm, the radius r of the arc of the thread crest 10 and the thread root 20 is 0.25 mm, the original height H of the thread profile is 2.2 mm, and the pitch p is 3.175 mm.

[0044] It should be noted that the shell 2 of the present utility model is connected to the protective cover 4 through quasi-circular threads, which has the characteristics of good processability and sealing performance, and also has the advantage of anti-slip, which is beneficial to improving the sealing connection quality between the shell 2 and the protective cover 4, so that the backwashing filter for oilfield water injection in this embodiment can be applied to the filtration in the process of high-pressure sewage reinjection.

[0045] The working principle of the backwashing filter for oilfield water injection in this embodiment is as follows: The backwashing valve 5, the first connecting pipe 6 and the second connecting pipe 7 are respectively connected to the filter body 1. Among them, the first connecting pipe 6 and the second connecting pipe 7 are respectively connected to the water inlet pipe and the water outlet pipe, and their connection ends can be flange connections. The backwashing valve 5 is used to control the backwashing filter for oilfield water injection in this embodiment to achieve filtration or backwashing. The shell 2 is arranged in the vertical direction, and a columnar cavity is arranged inside it. The filter cartridge 3 is arranged in the columnar cavity of the shell 2. The lower end of the filter cartridge 3 is fixedly connected to the filter body 1 and communicated with the filter body 1. The upper end of the filter cartridge 3 is connected to the protective cover 4 through a rubber sealing ring 34. The protective cover 4 is threadedly connected to the shell 2 and presses the filter cartridge 3 on the filter body 1 after being threadedly connected to the shell 2.

[0046] Since oil and other organic polymers are generally accompanied in oilfield sewage, it is necessary to improve the filtering ability for oil and other organic polymers. However, the enhanced adhesion also leads to the need for frequent replacement of the filter element 321. Therefore, the filter cartridge 3 is slidably connected to the shell 2 to facilitate the removal of the filter cartridge 3 to clean the dirty filter element 321. In addition, for the case where the filter element 321 needs to be replaced, the filter element 321 for oil filtration is detachably connected to the filter cylinder body 32 to facilitate replacement.

[0047] The backwashing filter for oilfield water injection of the present utility model is provided with several layers of filter elements in the filter cylinder body. By setting several layers of filter elements, the filtration quality is improved, and it is suitable for the characteristics of easy water quality change during oilfield development. A guide groove is arranged in the shell and is slidably connected to the filter cartridge; and at least one layer of filter element in the filter cartridge is detachable. By taking out the filter cartridge to clean the dirty filter element or replace the filter element, the cleaning and regeneration of the filter element are realized, the water quality of the reinjected water in the oilfield is guaranteed, and the sewage utilization rate is improved. At the same time, the maintenance pressure is reduced, the service life is extended, and the practicability and flexibility of the equipment are improved.

[0048] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising the element. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0049] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A backwash filter for oil field water injection, characterized in that: include: The filter body (1) is respectively connected to the backwash valve (5), the first connecting pipe (6) and the second connecting pipe (7); A shell (2) is arranged on the filter body (1) and fixedly connected thereto, and guide grooves (21) are arranged on the inner side of the shell (2) in a vertical direction. The filter cartridge (3) is arranged in the housing (2), and comprises: a top connection cover (31), a filter cartridge body (32) and a bottom connection cover (33); the top connection cover (31) is threadedly connected to the filter cartridge body (32), and the filter cartridge body (32) is fixedly connected to the bottom connection cover (33); a top guide block (314) is relatively arranged on the outer side of the top connection cover (31), and a bottom guide block (331) is relatively arranged on the outer side of the bottom connection cover (33); all the top guide blocks (314) and all the bottom guide blocks (331) are respectively slidably connected to the corresponding guide grooves (21); A plurality of layers of filter elements (321) are sequentially arranged in the filter cylinder (32) from the outside to the inside, and at least one layer of the filter element (321) is detachably connected to the filter cylinder (32); a plurality of filter channels are arranged at intervals on each layer of the filter element (321) to absorb impurities, and the sizes of the filter channels of the plurality of layers of the filter element (321) decrease sequentially from the outside to the inside; The protective cover (4) is threadedly connected to the shell (2), wherein the connecting thread between the shell (2) and the protective cover (4) is a quasi-circular thread.

2. The backwash filter for oil field water injection according to claim 1, characterized in that: The top connecting cover (31) comprises: a top cover plate (311), a connecting portion (312) and a connecting screw (315), wherein the top cover plate (311) is arranged on the connecting portion (312) and is detachably connected to the connecting portion (312) via the connecting screw (315); and the connecting portion (312) is threadedly connected to the filter cylinder (32).

3. The backwash filter for oil field water injection according to claim 2, characterized in that: The upper end of the outermost filter element (321) is threadedly connected to the connection portion (312), and the lower end is fixedly connected to the bottom connection cover (33); the upper ends of all the remaining filter elements (321) are detachably connected to the top connection cover (31), and the lower ends are detachably connected to the bottom connection cover (33).

4. The backwash filter for oilfield water injection according to claim 2, characterized in that: The filter cartridge (3) further comprises: a rubber sealing ring (34); an extended positioning portion (313) is provided on the top cover plate (311), the rubber sealing ring (34) is sleeved outside the extended positioning portion (313), and the two ends of the rubber sealing ring (34) in the vertical direction are respectively abutted between the top cover plate (311) and the protective cover (4), so as to fix the filter cartridge (3) on the filter body (1).

5. The backwash filter for oil field water injection according to claim 1, characterized in that: The range of the thread profile angle α of the connecting thread of the housing (2) and the protective cover (4) is: 50°≤α≤55°, the range of the thread lead angle β is: 50°≤β≤60°, and the range of the thread bearing surface profile angle γ is: -5°≤γ≤0°.

6. The backwash filter for oil field water injection according to claim 5, characterized in that: The crest (10) and the root (30) of the connecting thread between the housing (2) and the protective cover (4) are both arc-shaped, and the radius r of the arc is in the range of 0.2 mm ≤ r ≤ 0.3 mm.

7. The backwash filter for oilfield water injection according to claim 5, characterized in that: The taper of the connecting thread of the engaging portion between the housing (2) and the protective cover (4) is 1:

16.

8. The backwash filter for oilfield water injection according to claim 1, characterized in that: The backwash valve (5) is a ball valve, and the filter body (1) is connected to the inside or outside of the filter cartridge (3) through the backwash valve (5).

9. The backwash filter for oilfield water injection according to claim 1, characterized in that: Also includes: A foot support (8), wherein the foot support (8) is threadedly connected to the lower end of the filter body (1).

10. The backwash filter for oil field water injection according to claim 1, characterized in that: The housing (2) and the protective cover (4) are sealed together via a sealing ring; and the filter body (1) and the filter cartridge (3) are sealed together via a sealing ring.

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