Backflush filter for oilfield water injection

Abstract

The utility model relates to the technical field of oilfield water injection, especially to the backwashing filter of oilfield water injection, including filter main part and processing box, processing box sets up in one side of filter main part, and the water inlet of processing box and filter main part is connected through, and the inside fixed mounting of processing box has multiple groups of baffle, multiple groups of baffle evenly linearly staggered arrangement, and the connecting place of processing box and filter main part is provided with control valve, and the upper end of processing box is provided with sealing cover, the utility model discloses can fill activated carbon, oil -absorbing fibre etc. adsorbing material in the inside through processing box, and the oil quality in the oilfield produced water that passes through processing box is adsorbed, makes oil -water separation, and the zigzag flow channel can be formed in processing box through baffle, increases the time of water flow through processing box, makes the time of water flow and adsorbing material contact longer, improves the adsorption effect of adsorbing material to the oil quality in water, effectively reduces the oil content in water, reduces the filtration pressure of filter main part.

Description

Technical Field

[0001] This utility model relates to the field of oilfield water injection technology, and in particular to a backwash filter for oilfield water injection. Background Technology

[0002] Water injection is the process of using water injection equipment to inject water of the required quality from injection wells into the oil reservoir to maintain reservoir pressure. This process is called oilfield water injection and is one of the important means to replenish the formation with energy and improve the oilfield recovery rate during oilfield development.

[0003] Currently, treated oilfield produced water is commonly used for reinjection, which can effectively achieve energy conservation and emission reduction. In order to ensure that the reinjected water quality meets the requirements, a backwash filter is usually used to further filter the injected water. The filter cartridges in the current backwash filters only have a good filtration effect on impurities in the water. However, the oil content in the oilfield produced water is high, and the oil in the water is easily adsorbed on the surface of the filter cartridge, affecting the filtration effect. Moreover, the oil is not easy to be washed clean, which will also affect the backwashing effect of the filter.

[0004] Therefore, to address the above issues, a backwash filter for oilfield water injection can be designed to pre-adsorb the oilfield produced water passing through the filter cartridge, effectively reducing the oil content in the water and decreasing the filtration pressure of the filter cartridge. Utility Model Content

[0005] To overcome the problem that current backwash filters only effectively filter impurities in water, but oilfield produced water has a high oil content, the oil in the water is easily adsorbed on the surface of the filter cartridge, affecting the filtration effect, and the oil is not easy to wash away, which also affects the backwashing effect of the filter.

[0006] The technical solution of this utility model is as follows: a backwash filter for oilfield water injection, comprising a filter body, a treatment box, and a filter cartridge. The filter cartridge is disposed inside the filter body, and the treatment box is disposed on one side of the filter body. The treatment box is connected to the inlet of the filter body. Multiple sets of partitions are fixedly installed inside the treatment box, and the multiple sets of partitions are evenly and linearly staggered. Two sets of electric heating plates are fixedly installed on the periphery of the treatment box. A control valve is provided at the connection between the treatment box and the filter body, and a sealing cover is provided at the top of the treatment box.

[0007] Preferably, the treatment tank can be filled with adsorbent materials such as activated carbon and oil-absorbing fibers to adsorb oil in the oilfield produced water, thus separating the oil and water. A heating plate can be installed to heat the adsorbent materials inside the treatment tank, increasing the activity of the oil in the water and allowing for full contact between the oil and the adsorbent materials. A baffle can create a tortuous flow channel within the treatment tank, increasing the time the water spends in contact with the adsorbent materials and effectively improving their adsorption of oil. A control valve prevents backflow into the treatment tank during backwashing. A filter cartridge further filters the water entering the filter body, removing residual impurities and ensuring that the water quality for oilfield injection meets requirements.

[0008] Preferably, an installation plate is fixedly installed inside the filter body. The installation plate is located above the water inlet of the filter body and below the water outlet of the filter body. A positioning ring is fixedly installed at the upper end of the installation plate, and a connecting plate is fixedly installed at the lower end of the filter cartridge. The connecting plate and the positioning ring correspond to each other.

[0009] Preferably, a top cover is provided at the upper end of the filter body, and a flexible pressure block is fixedly installed at the lower end of the top cover, with the flexible pressure block in contact with the upper surface of the filter cartridge.

[0010] Preferably, the upper end of the positioning ring is provided with two sets of annular grooves, and the lower end of the connecting plate is fixedly installed with two sets of annular sealing rings, with the two sets of sealing rings corresponding to the two sets of grooves respectively.

[0011] Preferably, both the groove and the sealing ring have inverted triangular cross-sections, and the cross-sectional area of ​​the sealing ring is larger than that of the groove.

[0012] Preferably, an electrical control box is fixedly installed on the outside of the filter body, and a set of pressure gauges is installed at both the inlet and outlet of the filter body.

[0013] Preferably, a drain pipe is connected to the lower end of the filter body, and a drain valve is connected to one end of the drain pipe.

[0014] The beneficial effects of this utility model are:

[0015] 1. During normal filtration operation, activated carbon, oil-absorbing fibers, and other adsorbent materials are filled inside the treatment tank to adsorb oil from the oilfield-produced water, thus separating the oil and water. The heating plate heats the adsorbent materials inside the treatment tank, increasing the activity of the oil in the water and allowing the oil to fully contact the adsorbent materials. The baffles create a tortuous flow channel in the treatment tank, increasing the time the water spends in the treatment tank and allowing the water to contact the adsorbent materials for a longer period. This effectively improves the adsorption effect of the adsorbent materials on the oil in the water, effectively reduces the oil content in the water, and reduces the filtration pressure of the filter cartridge inside the filter body.

[0016] 2. With the top cover and flexible pressure block, the filter cartridge can be easily removed for deep cleaning after the top cover is opened. The adsorption material in the treatment box can be easily replaced through the sealing cover to ensure that the water quality of the oilfield injection meets the requirements. Attached Figure Description

[0017] Figure 1 The diagram shown is a first three-dimensional structural schematic of the backwash filter for oilfield water injection according to this utility model.

[0018] Figure 2 The diagram shown is a two-dimensional structural schematic of the backwash filter for oilfield water injection according to this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the backwash filter treatment box for oilfield water injection according to this utility model.

[0020] Figure 4 The diagram shown is a three-dimensional cross-sectional view of the main body of the backwash filter for oilfield water injection according to this utility model.

[0021] Figure 5 The diagram shows a three-dimensional structural design of the filter cartridge installation for the backwashing filter used in oilfield water injection according to this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Filter body; 101. Mounting plate; 102. Positioning ring; 103. Top cover; 104. Flexible pressure block; 2. Treatment box; 201. Partition plate; 202. Sealing cover; 203. Control valve; 204. Heating plate; 3. Filter cartridge; 301. Connecting plate; 401. Sealing ring; 402. Groove; 501. Electrical control box; 502. Pressure gauge; 601. Drain pipe; 602. Drain valve. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1 and Figure 3This utility model provides an embodiment of a backwash filter for oilfield water injection, comprising a filter body 1, a treatment box 2, and a filter cartridge 3. The filter cartridge 3 is disposed inside the filter body 1, and the treatment box 2 is disposed on one side of the filter body 1, with the treatment box 2 being connected to the inlet of the filter body 1. Multiple sets of partitions 201 are fixedly installed inside the treatment box 2, and the partitions 201 are arranged in a uniform linear staggered pattern. Two sets of electric heating plates 204 are fixedly installed on the periphery of the treatment box 2. A control valve 203 is provided at the connection between the treatment box 2 and the filter body 1, and a sealing cap 202 is provided at the upper end of the treatment box 2. By setting the treatment box 2, activated carbon, oil-absorbing fibers, and other adsorption materials can be filled inside to adsorb the oil passing through the treatment box 2. Oil is adsorbed into the water produced in the oilfield, resulting in oil-water separation. An electric heating plate 204 heats the adsorption material inside the treatment tank 2, increasing the activity of the oil in the water and allowing for sufficient contact between the oil and the adsorption material. A baffle 201 creates a tortuous flow channel within the treatment tank 2, increasing the time the water spends in the tank and thus extending the contact time with the adsorption material, effectively improving the adsorption effect of the material on the oil in the water. A control valve 203 prevents backflow of water into the treatment tank 2 during backwashing. A filter cartridge 3 further filters the water entering the filter body 1, removing residual impurities and ensuring that the water quality for oilfield injection meets requirements.

[0025] Please see Figure 4 and Figure 5In this embodiment, an mounting plate 101 is fixedly installed inside the filter body 1. The mounting plate 101 is located above the water inlet of the filter body 1 and below the water outlet of the filter body 1. A positioning ring 102 is fixedly installed on the upper end of the mounting plate 101, and a connecting plate 301 is fixedly installed on the lower end of the filter cartridge 3. The connecting plate 301 corresponds to the positioning ring 102. A top cover 103 is provided on the upper end of the filter body 1, and a flexible pressing block 104 is fixedly installed on the lower end of the top cover 103. The flexible pressing block 104 contacts the upper surface of the filter cartridge 3. The mounting plate 101 supports the filter cartridge 3, the positioning ring 102 and the connecting plate 301 can be used to position and install the filter cartridge 3, and the top cover 103 and the flexible pressing block 104 can be used to press the filter cartridge 3. The positioning ring 102 has two sets of annular grooves 402 at its upper end, and two sets of annular sealing rings 401 are fixedly installed at the lower end of the connecting plate 301. The two sets of sealing rings 401 correspond to the two sets of grooves 402 respectively. The cross-section of both the grooves 402 and the sealing rings 401 is inverted triangle, and the cross-sectional area of ​​the sealing rings 401 is larger than that of the grooves 402. By setting the sealing rings 401 and the grooves 402 to cooperate, the connection between the positioning ring 102 and the connecting plate 301 can be sealed to ensure the filtration effect of the filter cartridge 3. The inverted triangle cross-section of the grooves 402 and the sealing rings 401 can effectively improve the sealing effect. The cross-sectional area of ​​the sealing rings 401 is larger than that of the grooves 402, which allows the sealing rings 401 to fit tightly against the inner wall of the grooves 402, ensuring the sealing effect.

[0026] Please see Figure 1 , Figure 2 and Figure 4 In this embodiment, an electrical control box 501 is fixedly installed on the outside of the filter body 1, and a set of pressure gauges 502 are installed at both the inlet and outlet of the filter body 1. The filter body 1 is controlled by the electrical control box 501, and the pressure values ​​at the inlet and outlet of the filter body 1 can be monitored by the pressure gauges 502. During use, the filter cartridge 3 will absorb impurities, creating a pressure difference. When the set pressure difference is reached, backwashing is started to clean the filter cartridge 3. A drain pipe 601 is connected through the lower end of the filter body 1, and a drain valve 602 is connected to one end of the drain pipe 601. The drain pipe 601 is controlled by the drain valve 602, so that the flushed wastewater is discharged from the filter body 1 during backwashing.

[0027] During normal filtration, the treatment tank 2 is filled with adsorbent materials such as activated carbon and oil-absorbing fibers to adsorb oil from the oilfield water, thus separating the oil and water. The heating plate 204 heats the adsorbent materials inside the treatment tank 2, increasing the activity of the oil in the water and allowing the oil to fully contact the adsorbent materials. The baffle 201 forms a tortuous flow channel in the treatment tank 2, increasing the time the water flows through the treatment tank 2 and allowing the water to contact the adsorbent materials for a longer period of time, effectively improving the adsorption effect of the adsorbent materials on the oil in the water. The treated water is then transported into the interior of the filter body 1, where it is further filtered by the filter cartridge 3 to remove impurities. Finally, the water is discharged from the outlet of the filter body 1 for water injection.

[0028] The filter body 1 is controlled by the electrical control box 501. The pressure gauge 502 can monitor the pressure values ​​of the inlet and outlet of the filter body 1. During use, the filter cartridge 3 will absorb impurities, creating a pressure difference. When the set pressure difference is reached, backwashing is started and the control valve 203 is closed to clean the filter cartridge 3. The drain valve 602 controls the drain pipe 601, so that the flushed wastewater is discharged from the filter body 1 during backwashing.

[0029] After working for a period of time, the adsorption material in the treatment box 2 can be easily replaced using the sealing cover 202, and the filter cartridge 3 can be easily removed for deep cleaning after opening the top cover 103.

[0030] Through the above steps, the treatment tank 2 can be filled with adsorbent materials such as activated carbon and oil-absorbing fibers to adsorb oil in the oilfield produced water, thus separating oil and water. The baffle 201 can form a tortuous flow channel in the treatment tank 2, increasing the time that the water flows through the treatment tank 2, so that the water has a longer contact time with the adsorbent material, improving the adsorption effect of the adsorbent material on the oil in the water, effectively reducing the oil content in the water, and reducing the filtration pressure of the filter body 1. This solves the problem that the filter cartridge 3 in the current backwash filter only has a good filtration effect on impurities in the water, but the oil content in the oilfield produced water is high, and the oil in the water is easily adsorbed on the surface of the filter cartridge 3, affecting the filtration effect. Moreover, the oil is not easy to be washed clean and will also affect the backwashing effect of the filter.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A backwash filter for oilfield water injection, comprising a filter body (1), characterized in that: It also includes a treatment box (2) and a filter cartridge (3). The filter cartridge (3) is located inside the filter body (1). The treatment box (2) is located on one side of the filter body (1). The treatment box (2) is connected to the inlet of the filter body (1). Multiple sets of partitions (201) are fixedly installed inside the treatment box (2). The multiple sets of partitions (201) are evenly and linearly staggered. Two sets of electric heating plates (204) are fixedly installed on the periphery of the treatment box (2). A control valve (203) is provided at the connection between the treatment box (2) and the filter body (1). A sealing cover (202) is provided at the upper end of the treatment box (2).

2. The backwash filter for oilfield water injection according to claim 1, characterized in that: An installation plate (101) is fixedly installed inside the filter body (1). The installation plate (101) is located above the water inlet of the filter body (1) and below the water outlet of the filter body (1). A positioning ring (102) is fixedly installed at the upper end of the installation plate (101). A connecting plate (301) is fixedly installed at the lower end of the filter cartridge (3). The connecting plate (301) and the positioning ring (102) correspond to each other.

3. The backwash filter for oilfield water injection according to claim 1, characterized in that: The filter body (1) is provided with a top cover (103) at the upper end, and a flexible pressure block (104) is fixedly installed at the lower end of the top cover (103). The flexible pressure block (104) is in contact with the upper surface of the filter cartridge (3).

4. The backwash filter for oilfield water injection according to claim 2, characterized in that: The upper end of the positioning ring (102) is provided with two sets of annular grooves (402), and the lower end of the connecting plate (301) is fixedly installed with two sets of annular sealing rings (401). The two sets of sealing rings (401) correspond to the two sets of grooves (402) respectively.

5. The backwash filter for oilfield water injection according to claim 4, characterized in that: Both the groove (402) and the sealing ring (401) have inverted triangular cross sections, and the cross-sectional area of ​​the sealing ring (401) is larger than that of the groove (402).

6. The backwash filter for oilfield water injection according to claim 1, characterized in that: An electrical control box (501) is fixedly installed on the outside of the filter body (1), and a set of pressure gauges (502) are installed at both the inlet and outlet of the filter body (1).

7. The backwash filter for oilfield water injection according to claim 1, characterized in that: The lower end of the filter body (1) is connected to a drain pipe (601), and one end of the drain pipe (601) is connected to a drain valve (602).

Images