A backwashing filter control device for a water distribution valve group

Abstract

The utility model discloses a backwashing filter control device for a water distribution valve group, comprising an inlet pipe, a filter cartridge, an outlet pipe and a backwashing pipe; the filter cartridge comprises an outer cylinder and a protective pipe, the protective pipe is located inside the outer cylinder and a plurality of leakage holes are opened on the side of the protective pipe, a filter screen is wound around the side of the protective pipe, the inlet pipe is connected to the protective pipe, the outlet pipe is connected to the outer cylinder, one end of the backwashing pipe is connected to the inlet pipe, and the other end is connected to the outlet pipe, a backwashing control valve is arranged on the backwashing pipe, a control valve is arranged on the inlet pipe and the control valve is located behind the connection between the backwashing pipe and the inlet pipe. The utility model adopts a direct filtration method to remove suspended solids, and its structure is simple and miniaturized. It uses a water injection wellhead to realize on-site water treatment, and then injects it back into the target layer of the oil well, thereby reducing pipeline transportation, reducing ground processing costs, extending the economic life of oil and gas wells, and improving the economic benefits of oil and gas fields.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration protection, in particular to a backwash filtration control device for a water distribution valve group. Background Art

[0002] In recent years, with the continuous development of oil and gas fields around the world, there have been new attempts and breakthroughs in the treatment technology of oil well effluent, and the oil and gas industry has increasingly attached importance to the technology of filtering, separating and reinjecting oil well effluent. However, the current oil well exploitation generally adopts the oil well sewage treatment process technology of "oil, gas and water mixed production - ground separation - sewage treatment - sewage reinjection process". After the oilfield oily sewage is centrally treated at the sewage station, it is transported to the injection valve group through a pipeline over a long distance. Due to the decrease in temperature, the breeding of bacteria and the secondary pollution of the pipeline, the water quality at the wellhead has deteriorated significantly, which is far from meeting the requirements of formation reinjection water. Therefore, it is necessary to use a wellhead fine filter to further filter and treat the reinjection water. However, the existing oil well reinjection water fine filter is large in size, complex in structure and has a high failure rate. Not only is the initial investment cost high, but the later operation and management costs are also high.

[0003] During the high-pressure water injection process, the residues in the reinjection water, such as scale, rust and some suspended matter, not only cause secondary pollution to the formation, but also cause blockage and damage to the water injection automatic controller, flow meter, pressure transmitter and other instruments in the water injection system, seriously affecting the normal operation of the equipment. Although the previous high-pressure angle filter has a certain filtering effect on coarse particles, the filtering effect is not good under high pressure. The filter screen cannot be cleaned after clogging, resulting in rust and decay, and the replacement workload is very large. In addition, there are backwash filters used in oil field water distribution valve groups, but this type of filter only relies on the backwash water at the bottom of the well to discharge sewage. The pressure difference at the bottom of the well is unstable or there is no backwash. This type of filter has poor backwashing effect and general sewage discharge effect. Utility Model Content

[0004] In view of the shortcomings existing in the above problems, the utility model provides a backwashing filtration control device for a water distribution valve group.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a backwashing and filtering control device for a water distribution valve group, comprising a water inlet pipe, a filter cartridge, a water outlet pipe and a backwashing pipe;

[0006] Wherein, the filter cylinder includes an outer cylinder and a protective tube, the protective tube is located inside the outer cylinder and a plurality of leakage holes are opened on the side of the protective tube, a filter net is wrapped around the side of the protective tube, the water inlet pipe is connected to the protective tube, the water outlet pipe is connected to the outer cylinder, one end of the backwash pipe is connected to the water inlet pipe, and the other end is connected to the water outlet pipe, a backwash control valve is provided on the backwash pipe, a control valve is provided on the water inlet pipe and the control valve is located behind the connection between the backwash pipe and the water inlet pipe.

[0007] Preferably, it further comprises a sewage pipe, on which a sewage valve is provided, the sewage pipe is arranged opposite to the water outlet pipe and the sewage pipe is connected to the outer cylinder and the protective pipe at intervals.

[0008] Preferably, the filter cartridge is vertically arranged to the water inlet pipe and the water outlet pipe, and a flange-type flange blind plate is provided at the top of the filter cartridge or a quick-opening threaded cap is provided at the top of the filter cartridge.

[0009] Preferably, the outer diameter of the flange blind plate is 245 mm, the outer diameter of the threaded cap is 166 mm, the outer diameter of the backwash pipe is 34 mm, and the outer diameter of the filter cartridge is 140 mm.

[0010] Preferably, a sealing cover is provided at the top end of the protection tube.

[0011] Preferably, the top end of the filter cartridge is the flange blind plate, and the sealing cover is located between the flange blind plate and the top end of the outer cartridge, and a sealing gasket is provided around the sealing cover.

[0012] Preferably, the top end of the filter cartridge is the threaded cap, and the sealing cover is located at the top end of the inner side of the outer cartridge.

[0013] Preferably, the filter cartridge further comprises a partition core, which comprises a partition ring and a partition plate, wherein half of the outer diameter of the partition ring is larger than the other half of the outer diameter, the large outer diameter of the partition ring is consistent with the inner diameter of the outer cartridge, the cross-section of the partition plate is consistent with the remaining part of the large outer diameter of the partition ring, and the protective tube is connected to the inner ring of the partition ring.

[0014] Preferably, a digital pressure gauge or a seismic pressure gauge is provided on the water inlet pipe, and the digital pressure gauge or the seismic pressure gauge is located behind the control valve.

[0015] Preferably, a needle valve is provided between the digital pressure gauge or the seismic-resistant pressure gauge and the water inlet pipe.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model adopts a direct filtration method to remove suspended solids, and its structure is simple and miniaturized. After being treated by the device, the water output index reaches oil content ≤ 2mg / l and suspended solid content ≤ 3mg / l, and the water injection wellhead is used to realize on-site water treatment, and then the water is injected back into the target layer of the oil well, thereby reducing pipeline transportation, reducing ground processing costs, extending the economic life of oil and gas wells, and improving the economic benefits of oil and gas fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the flange blind plate type of the backwashing filter control device of the water distribution valve group of the utility model;

[0019] Figure 2 This is a structural diagram of a threaded cap type backwash filter control device for a water distribution valve group of the utility model;

[0020] Figure 3 It is a cross-sectional view of a flange blind plate type filter cartridge of a backwash filter control device of a water distribution valve group of the utility model;

[0021] Figure 4 It is a cross-sectional view of a threaded cap type filter cartridge of a backwash filter control device of a water distribution valve group of the utility model;

[0022] Figure 5 It is a cross-sectional view of the backwashing and filtering control device of the water distribution valve group of the utility model;

[0023] Figure 6 It is a structural diagram of the partition core in the backwash filtration control device of the water distribution valve group of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The following is combined with Figure 1-6 The utility model is further described in detail:

[0028] like Figure 1 As shown, the utility model provides a backwashing and filtering control device for a water distribution valve group, comprising a water inlet pipe 1, a filter cartridge 2, a water outlet pipe 3 and a backwashing pipe 4;

[0029] Reference Figure 2 The filter cartridge 2 includes an outer cartridge 21 and a protective tube 22. The protective tube 22 is located inside the outer cartridge 21 and is coaxially arranged with the outer cartridge 21. A plurality of leak holes are provided on the side of the protective tube 22. A filter screen 23 is wound around the outer side of the protective tube 22. The water inlet pipe 1 is connected to the bottom end of the protective tube 22. The water outlet pipe 3 is connected to the outer cartridge 21 and the protective tube 22 at intervals. One end of the backwash pipe 4 is connected to the water inlet pipe 1 connecting pipe, and the other end is connected to the water outlet pipe 3. A backwash control valve 41 is provided on the backwash pipe 4. A control valve 11 is provided on the water inlet pipe 1. The control valve 11 is located behind the connection between the backwash pipe 4 and the water inlet pipe 1. A digital pressure gauge or a seismic pressure gauge 12 is provided on the water inlet pipe 1. The digital pressure gauge or the seismic pressure gauge 12 is located behind the control valve 11. A needle valve 13 is provided between the digital pressure gauge or the seismic pressure gauge 12 and the water inlet pipe 1. The outer diameter of the backwash pipe is 34 mm. The maximum pressure of the device is 35 MPa.

[0030] Specifically, a plurality of holes are provided on the side of the protective tube 22, and the water inlet pipe 1 is connected to the bottom end 22 of the protective tube. Water from the water inlet pipe 1 enters from the bottom end of the protective tube 22, flows out from the holes on the side of the protective tube 22, and flows out through the wound filter net 23. The water then enters the gap between the outer tube 21 and the protective tube 22, and is discharged through the water outlet pipe 3.

[0031] In this embodiment, a sewage discharge pipe is also included. A sewage discharge valve is provided on the sewage discharge pipe. The sewage discharge pipe is arranged opposite to the water outlet pipe 3 and the sewage discharge pipe is connected to the outer cylinder 21 and the protective pipe 22 at intervals.

[0032] The working principle of the device is as follows: incoming water enters the water inlet pipe, opens the control valve 11 and then enters the filter cartridge 2 for forward filtration, and clean water flows out through the filter screen 23 and the outer cartridge 21. When backwashing is required, close the control valve 11, open the backwash control valve 41, and open the drain valve to complete the backwashing. The backwashing is carried out under high pressure and only takes 1 to 2 minutes. After the backwashing is completed, close the backwash control valve 41, then close the drain valve, and open the control valve 11 to continue injecting water.

[0033] Under a certain pressure, water flows through the device, and the suspended matter in the water is blocked outside the filter 23. The treated water flows into the well from the inside of the filter 23. The device can effectively remove mechanical impurities with a particle size of ≥1μm; ≤150μm, and further purify the water quality of the injected water.

[0034] In this embodiment, the filter cartridge 2 is vertically arranged with the water inlet pipe 1 and the water outlet pipe 3, and a flange-type flange blind plate 27 or a quick-opening threaded cap 28 is provided at the top of the filter cartridge 2. Figure 1 A flange blind plate 27 is provided at the top of the filter cartridge 2. Figure 2 The top of the filter cartridge 2 is provided with a quick-opening screw cap 28. The outer diameter of the flange blind plate 27 is 245 millimeters, and the screw cap 28 is 166 millimeters.

[0035] Furthermore, a cover 25 is provided at the top of the protection tube 22, and a flange blind plate 27 is provided at the top of the filter cartridge 2. The cover 25 is located between the flange blind plate 27 and the top of the outer cartridge 21, and a sealing gasket is provided around the cover 25. The flange blind plate 27 is connected to the outer cartridge 21 by bolts. A threaded cap 28 is provided at the top of the filter cartridge 2. The cover 26 is located at the top of the inner side of the outer cartridge 21, and the threaded cap 28 is connected to the outer cartridge 21 by threads.

[0036] Reference Figure 5 and 6 The filter cartridge 2 further includes a separation core 24, which includes a separation ring 241 and a separation plate 242. The outer diameter of the separation ring 241 is larger than the outer diameter of the other half. The large outer diameter of the separation ring 241 is consistent with the inner diameter of the outer cartridge 21. The cross section of the separation plate 242 is consistent with the remaining part of the large outer diameter of the separation ring 241. The protection tube 22 is connected to the inner ring 243 of the separation ring 241. The water inlet pipe 1 is connected to the protection tube 22 through the inner ring 243 of the separation ring 241.

[0037] In this embodiment, the backwashing filter control device of the water distribution valve group is installed on the oil field water injection well, and is a device for filtering and treating the secondary pollution distribution in the water injected into the oil field, such as dirty oil, suspended matter, fine mud and other mechanical impurities. The filter control device is suitable for the water distribution room, steady flow water distribution valve group and water injection wellhead of the oil field water injection system; the use of the filter cartridge 2 can effectively improve the quality of water injection, reduce the blockage of mechanical impurities to the formation, and protect the water absorption capacity of the reservoir, which is very necessary for the work of injecting water into the peripheral low-permeability oil field; the device has the characteristics of small size, light weight, high pressure resistance, long life, easy installation, simple operation, obvious filtering effect, good reliability, etc. The water quality filtration accuracy can be adjusted according to the accuracy of the filter screen 23, and the filter screen 23 can be reused, which brings great convenience to users; the backwashing filter control device of the water distribution valve group protects the water injection automatic controller, flow meter, pressure transmitter and other instruments in the water injection system.

[0038] In this embodiment, the filter screen 23 can be a five-layer structure, and the filter screen 23 is formed by superimposing and sintering a protective layer, a filter layer, a dispersion layer and a skeleton layer. This kind of filter material has both stable filtering accuracy and high strength and rigidity, and is an ideal filter material for occasions where high compressive strength and uniform filtering particle size are required. The standard five-layer sintered mesh is made by superimposing five layers of stainless steel wire mesh and vacuum sintering. It has the characteristics of strong corrosion resistance, good permeability, high strength, easy cleaning and backwashing, precise filtering accuracy, hygienic and clean filter material, and no falling off of the wire mesh.

[0039] In this embodiment, the filter screen 23 may be a two-layer structure, which includes a protective layer and a filter layer, and has the characteristics of strong corrosion resistance, good permeability, easy cleaning and backwashing, and the screen does not fall off.

[0040] The backwash filtration control device between the water distribution valve groups is very different from the previous filters. Firstly, it realizes the backwashing, control switch and sewage discharge functions, and controls the backwashing of the filter 23 according to the change of the inlet and outlet water pressure difference. The operation is simple and the backwashing is fast. Secondly, the filter 23 has been greatly improved, and a multi-layer sintered metal mesh filter element is adopted. The multi-layer sintered metal mesh is a new type of filter material made of multi-layer metal woven wire mesh through special lamination pressing and vacuum sintering processes, and has high mechanical strength and overall rigid structure. The meshes of each layer of the wire mesh are interlaced to form a uniform and ideal filtering structure, which not only overcomes the shortcomings of low strength, poor rigidity and unstable mesh shape of ordinary metal wire mesh, but also can reasonably match and design the pore size, permeability and strength characteristics of the material, so that it has excellent filtering accuracy, filtering impedance, mechanical strength, wear resistance, heat resistance and processability, and its comprehensive performance is significantly better than sintered metal powder, ceramics, fibers, and filter cloths. The water enters the filter barrel for forward filtration, and the clean water flows out through the filter screen 23 and the outer cylinder 21. When backwashing is required, the control valve 11 is closed, the backwash control valve 41 is opened, and the drain valve is opened to complete the cleaning. The backwashing is carried out under high pressure and only takes 1 to 2 minutes. After the backwashing is completed, the backwash control valve 41 is closed, the drain valve is closed, and the control valve 11 is opened to continue water injection. The filter control device protects the water injection automatic controller, flow meter, pressure transmitter and other instruments in the water injection system.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A backwash filtration control device for a water distribution valve group, characterized in that: Including water inlet pipe, filter cartridge, water outlet pipe and backwash pipe; Wherein, the filter cylinder includes an outer cylinder and a protective tube, the protective tube is located in the outer cylinder, a filter net is wrapped around the side of the protective tube, the water inlet pipe is connected to the protective tube, the water outlet pipe is connected to the outer cylinder, one end of the backwash pipe is connected to the water inlet pipe, and the other end is connected to the water outlet pipe, a backwash control valve is provided on the backwash pipe, a control valve is provided on the water inlet pipe and the control valve is located behind the connection between the backwash pipe and the water inlet pipe.

2. The backwash filtration control device for a water distribution valve group according to claim 1, characterized in that: It also includes a sewage pipe, on which a sewage valve is provided. The sewage pipe is arranged opposite to the water outlet pipe, and the sewage pipe is connected to the outer cylinder and the protective pipe at intervals.

3. The backwash filtration control device for a water distribution valve group according to claim 2, characterized in that: The filter cartridge is vertically arranged to the water inlet pipe and the water outlet pipe, and a flange-type flange blind plate is provided at the top of the filter cartridge or a quick-opening threaded cap is provided at the top of the filter cartridge.

4. The backwash filtration control device for a water distribution valve group according to claim 3, characterized in that: The outer diameter of the flange blind plate is 245 mm, the outer diameter of the threaded cap is 166 mm, the outer diameter of the backwash pipe is 34 mm, and the outer diameter of the filter cartridge is 140 mm.

5. The backwash filtration control device for a water distribution valve group according to claim 3, characterized in that: A sealing cover is provided at the top of the protection tube.

6. The backwash filtration control device for a water distribution valve group according to claim 5, characterized in that: The top end of the filter cartridge is the flange blind plate, and the sealing cover is located between the flange blind plate and the top end of the outer cartridge, and a sealing gasket is provided around the sealing cover.

7. The backwash filtration control device for a water distribution valve group according to claim 5, characterized in that: The top end of the filter cartridge is the threaded cap, and the sealing cover is located at the top end of the inner side of the outer cartridge.

8. The backwash filtration control device for a water distribution valve group according to claim 2, characterized in that: The filter cartridge also includes a partition core, which includes a partition ring and a partition plate. Half of the outer diameter of the partition ring is larger than the other half of the outer diameter. The large outer diameter of the partition ring is consistent with the inner diameter of the outer cartridge. The cross-section of the partition plate is consistent with the remaining part of the large outer diameter of the partition ring. The protective tube is connected to the inner ring of the partition ring.

9. The backwash filtration control device for a water distribution valve group according to claim 1, characterized in that: The water inlet pipe is provided with a digital pressure gauge or a seismic pressure gauge, and the digital pressure gauge or the seismic pressure gauge is located behind the control valve.

10. The backwash filtration control device of the water distribution valve group according to claim 9, characterized in that: A needle valve is provided between the digital pressure gauge or the anti-seismic pressure gauge and the water inlet pipe.

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