Filtering device for sewage produced by water injection well in oilfield development

Abstract

The invention relates to the technical field of filtering devices, and discloses an oilfield development water injection well produced sewage filtering device which is characterized in that a filtering barrel is horizontally arranged in a box body, filtering net holes are formed in the circumferential direction of the filtering barrel, the filtering barrel is provided with an opening end, a through hole is formed in the side, away from the opening, of the filtering barrel, and the filtering barrel is used for containing sewage; the plurality of slag discharging plates are arranged on the inner wall of the filtering barrel in the length direction of the filtering barrel and incline towards the same clockwise direction or the same anticlockwise direction of the inner wall of the filtering barrel; one end of the slag guide plate is located in the filtering barrel, the other end of the slag guide plate penetrates out of the through hole and extends out of the box body, and the slag guide plate is obliquely arranged downwards so that impurities on the slag guide plate can be discharged out of the box body; the driving part is connected with the filtering barrel and is used for driving the filtering barrel to rotate around the horizontal central axis of the filtering barrel; according to the filtering device, an oil sludge mixture can be effectively cleaned in the filtering process, so that the problem that filter screen holes are blocked is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of filtering devices, and in particular to a device for filtering produced sewage from a water injection well in oil field development. Background Art

[0002] When an oil field enters the middle or late stage, a large amount of sewage will be produced during crude oil extraction. When water is injected into some oil wells, the treated sewage is usually injected back into the oil wells. However, since there are many impurities in the oil-water mixed sewage pumped out from the well, if it is not treated thoroughly, the sewage containing impurities will be injected back into the oil well formation, which may seriously affect the development of the oil field.

[0003] In the prior art, the produced wastewater from injection wells is often filtered through a filter to ensure that the normal development of the oil field is not affected after the wastewater is injected back into the well. However, during the filtering process, the filtered impurities will gradually clog the filter, thereby affecting the treatment of the produced wastewater from the injection wells.

[0004] In order to solve the problem that the filter is often blocked, the prior art often uses a power component to drive a scraper to scrape off the impurities on the filter, or uses an inclined filter and vibrating method to vibrate and clean the impurities on the filter. Although the above two methods can alleviate the problem of filter blockage to a certain extent, these two methods are only effective for the treatment of solid impurities. Since the sewage produced from injection wells usually contains a soft and viscous sludge mixture, if a scraper is used, the sludge mixture is easy to adhere to the scraper or embed into the gap of the filter, thereby blocking the filter; if a vibrating filter is used, since the sludge mixture is soft in texture, the fluidity on the filter under vibration is poor, and the soft sludge mixture is easily embedded in the gap of the filter due to vibration, which still causes the filter blockage problem. Therefore, it is necessary to design a sewage filtration device for injection wells in oil field development to solve the problem of sludge mixture blocking the filter when filtering sewage produced from injection wells. Summary of the invention

[0005] The present invention proposes a wastewater filtering device for oilfield development water injection wells to solve the deficiencies in the above-mentioned prior art. The filtering device can effectively clean the oil sludge mixture during the filtering process, thereby avoiding the problem of filter mesh clogging.

[0006] The technical solution of the present invention is: a device for filtering produced sewage from an injection well in oil field development, comprising a box body, and further comprising;

[0007] A filter barrel is horizontally arranged in the box body, the filter barrel is provided with filter mesh holes in the circumference, the filter barrel has an open end, a through hole is provided on a side of the filter barrel away from the opening, and the filter barrel is used to hold sewage;

[0008] A plurality of slag discharge plates are arranged on the inner wall of the filter barrel along the length direction of the filter barrel, and the plurality of slag discharge plates are inclined in the same clockwise or counterclockwise direction toward the inner wall of the filter barrel;

[0009] A slag guide plate, one end of which is located in the filter barrel, and the other end of which passes through the through hole and extends to the outside of the box body, and the slag guide plate is arranged to be inclined downward so that impurities on the slag guide plate can be discharged outside the box body;

[0010] A driving member connected to the filter barrel and used to drive the filter barrel to rotate around the horizontal central axis of the filter barrel;

[0011] As the filter barrel rotates, when the slag discharge plate carrying impurities moves to a horizontal position, the longitudinal projection of the slag discharge plate away from the side of the filter barrel is located on the slag guide plate, so that the impurities on the slag discharge plate fall onto the slag guide plate; the above-mentioned impurities include sludge mixtures and other impurities in the wastewater produced by oil field development injection wells.

[0012] In at least one embodiment of the present invention, a mounting ring is provided at the opening of the filter barrel, one end of each of the slag discharge plates is connected to the mounting ring, and the other end of each of the slag discharge plates is connected to the inner wall of the filter barrel away from the opening, multiple slag discharge plates are provided with leakage holes, and the inner wall of the filter barrel is provided with multiple side panels, the multiple side panels correspond one-to-one to the multiple slag discharge plates, the side panels are fixedly connected to the slag discharge plates, and the angle between the side panels and the slag discharge plates is acute.

[0013] In at least one embodiment of the present invention, a partition is longitudinally provided in the box body for dividing the box body into a sewage bin and a filter bin, a water inlet is provided on the top of the sewage bin, a water outlet is provided on the side wall of the filter bin, a slag discharge port is provided on the side wall of the filter bin opposite to the partition, a mounting port is provided on the partition, the filter barrel is rotatably connected in the mounting port, the slag guide plate is overlapped on the slag discharge port, a spring rod is hinged on the side wall of the sewage bin, the movable rod end of the spring rod is hinged to the slag guide plate, and a water receiving plate is provided on the spring rod.

[0014] In at least one embodiment of the present invention, the filter barrel is made of stainless steel, and an inner wall of the filter barrel is coated with an oleophobic coating.

[0015] In at least one embodiment of the present invention, the slag guide plate is an arc-shaped plate, the slag guide plate is arranged in the middle of the filter barrel, and a baffle is provided on one side of the slag guide plate close to the opening of the filter barrel.

[0016] In at least one embodiment of the present invention, a water inlet bin is provided at the top water inlet of the sewage bin, a gear ring is provided on the upper part of the filter barrel, and the driving member comprises: a rotating shaft and a transmission shaft, the rotating shaft is transversely rotatably connected in the water inlet bin, a plurality of blades are provided on the rotating shaft, and the rotating shaft passes through the water inlet bin; the transmission shaft is transversely rotatably connected in the connecting port, the output end of the rotating shaft is connected to the transmission shaft by a chain mechanism passing through the box body, and the transmission shaft is provided with a gear meshing with the gear ring.

[0017] In at least one embodiment of the present invention, cams are provided on both sides of the gear on the transmission shaft, and the cams are used to strike the filter barrel.

[0018] In at least one embodiment of the present invention, a fixing ring is mounted inside the filter barrel, the fixing ring is located at the gear ring, and the cross section of the fixing ring is arc-shaped.

[0019] In at least one embodiment of the present invention, the rotation speed of the filter barrel is 1 r / min to 3 r / min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention is provided with a filter barrel for filtering wastewater produced from an injection well in oil field development, a slag discharge plate for scooping out oil sludge mixture and other impurities, and a slag guide plate for receiving the oil sludge mixture and other impurities and guiding them out of the box body; when the oil field development injection well produced wastewater filtering device of the present invention is used, the wastewater produced from the injection well enters the filter barrel and is filtered through the filter holes arranged on the filter barrel, the filtered impurities are retained in the filter barrel, and the water without impurities is discharged from the water outlet, and the slag discharge plate arranged in the filter barrel will carry the impurities in the filter barrel to move when the driving member drives the filter barrel to rotate, and because there is an angle between the slag discharge plate and the inner wall of the filter barrel, when the wastewater with oil sludge is When the slag discharge plate with the mixture and impurities moves to above the slag guide plate, the impurities on the slag discharge plate fall onto the slag guide plate due to gravity, and are finally discharged out of the box by the slag guide plate; since the slag discharge plate only lifts the oil sludge mixture and other impurities in the sewage produced by the injection well, compared with the technical means of scrapers or vibrating filters in the prior art, the slag discharge plate will not produce too much interaction with the oil sludge mixture during the lifting process, making it difficult for the oil sludge mixture to adhere to the slag discharge plate, and then the oil sludge mixture scooped out by the slag discharge plate can smoothly fall onto the slag guide plate, and finally be discharged from the box. Therefore, the use of this device can effectively clean the oil sludge mixture, thereby avoiding the problem of clogging of the filter mesh.

[0022] 2. The present invention arranges a side plate on the filter barrel. Since the angle between the side plate and the slag discharge plate is an acute angle, a certain water storage space is formed. When the slag discharge plate lifts and cleans the sludge and solid impurities, the water storage space can carry a certain amount of water. In the process of the slag discharge plate dumping the impurities, the water stored in the water storage space can simultaneously clean the slag discharge plate, so that the sludge and solid impurities remaining on the slag discharge plate can smoothly fall into the slag guide plate, ensuring that the slag discharge plate is discharged in a completely clean state, so that the impurities remaining in the filter barrel can be quickly and effectively cleaned, avoiding the accumulation and blockage of the filter mesh.

[0023] 3. The present invention provides a spring rod hinged in the sewage bin and hinged to the slag guide plate. When the device is working, sewage enters the sewage bin and impacts the water receiving plate. Since the sewage is separated by blades, the sewage intermittently passes through the water receiving plate to generate downward pressure on the spring rod. Since the two ends of the spring rod are respectively hinged to the sewage bin and the slag guide plate, the spring rod is intermittently deflected downward by pressure, which drives the slag guide plate to vibrate, so that the sludge on the slag guide plate will not stay in one position for too long, avoiding the sludge from sticking to the water receiving plate, so that the sludge and impurities on the slag guide plate can be smoothly discharged out of the box.

[0024] 4. The present invention arranges a cam on the transmission shaft so that the cam can intermittently hit the filter barrel during the rotation of the filter barrel. If some stubborn sludge mixture sticks to the slag discharge plate during the scooping process, the slag discharge plate can be hit by the cam to separate the stubborn sludge mixture from the slag discharge plate. In addition, impurities embedded in the filter holes can be separated from the filter barrel under the impact of the cam during the hitting process, thereby cleaning up the stubborn impurities embedded in the filter barrel to prevent the problem of filter mesh clogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the partial structure of the main cross-section of the present invention;

[0027] Figure 3 The side view of the present invention is a schematic diagram of the cross-sectional structure Figure 1 ;

[0028] Figure 4 For the present invention Figure 3 Detailed structural diagram at A;

[0029] Figure 5 The side view of the present invention is a schematic diagram of the cross-sectional structure Figure 2 ;

[0030] Figure 6It is a schematic diagram of a top view and cross-sectional structure of the present invention;

[0031] Figure 7 It is a schematic diagram of the main structure of the present invention.

[0032] Description of reference numerals:

[0033] 1. Box body; 11. Water inlet tank; 2. Partition; 21. Sewage tank; 22. Filter tank; 3. Filter barrel; 31. Gear ring; 32. Mounting ring; 4. Slag discharge plate; 5. Slag guide plate; 6. Driving part; 61. Rotating shaft; 611. Blade; 62. Transmission shaft; 621. Gear; 622. Cam; 7. Water guide plate. DETAILED DESCRIPTION

[0034] The drawings in the present invention are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structures.

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "up", "down", "far", "near", "front", "back" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] The wastewater produced from injection wells in oil field development is a mixture of oil sludge and other impurities.

[0038] In the prior art, a method of using a power component to drive a scraper to scrape off impurities on the filter screen, or a method of using an inclined filter screen and vibrating to clean impurities on the filter screen, although the above two methods can alleviate the problem of filter screen blockage to a certain extent to ensure the sewage treatment speed, these two methods are only effective for solid impurities. Direct scraping and vibration methods can basically clean solid impurities, but since the sewage produced from the injection well usually contains a soft and viscous oil sludge mixture, if a scraper method is used, the oil sludge mixture is easy to adhere to the scraper or embed into the filter screen gap, thereby blocking the filter screen; if a vibrating filter screen is used, due to the soft texture of the oil sludge mixture, the fluidity on the filter screen under vibration is poor, and the oil sludge mixture is easily embedded in the filter screen gap due to vibration, which will still cause the filter screen blockage problem, thereby affecting the subsequent sewage filtration. It can be seen that the common technical means of the prior art are difficult to completely solve the problem of filter screen filtration blockage. Therefore, when using the existing filtering device to filter the sewage produced from the injection well, in order to ensure the filtering effect, it is often necessary to stop the machine for cleaning.

[0039] In view of this, the present invention proposes a wastewater filtration device for oilfield development injection wells, which can thoroughly clean solid impurities and sludge mixtures during the filtration process to eradicate the problem of filter blockage, ensure the filtration speed of the device, and do not need to frequently shut down the filter screen of the device for cleaning.

[0040] Combination Figures 1 to 7 As shown, a device for filtering produced wastewater from an injection well in oil field development includes a box body 1, a water inlet is provided on the top of the box body 1, a slag discharge port and a water outlet are provided on the side wall of the box body 1, and further includes:

[0041] The partition 2 is longitudinally arranged in the box body 1, and an installation port is provided on the partition 2. The partition 2 divides the box body 1 into a sewage bin 21 and a filter bin 22. The water inlet is located at the top of the sewage bin 21, the slag discharge port is located on the side wall of the filter bin 22 opposite to the partition 2, and the water outlet is arranged on the side wall of the filter bin 22.

[0042] The filter barrel 3 is rotatably connected to the mounting opening on the partition 2 in a transverse direction, the opening of the filter barrel 3 faces the sewage bin 21, filter mesh holes are arranged around the filter barrel 3, and a through hole is arranged on one side of the filter barrel 3 away from the opening.

[0043] The plurality of slag discharge plates 4 are all horizontally arranged on the inner wall of the filter barrel 3, and the angles between the plurality of slag discharge plates 4 and the inner wall of the filter barrel 3 are all acute angles, and the plurality of slag discharge plates 4 are evenly distributed on the inner wall of the filter barrel 3; the inclination directions of the plurality of slag discharge plates 4 in the filter barrel 3 are all in the same clockwise or counterclockwise direction of the inner wall of the filter barrel 3, and the limitation of the acute angle can prevent the slag discharge plate 4 carrying the oily sludge mixture and other impurities from sliding out of the slag discharge plate 4 when the slag discharge plate 4 moves to a horizontal state with the slag guide plate 5, thereby causing slag discharge failure. Only when the slag discharge plate 4 carrying the oily sludge mixture and other impurities moves to just above the slag guide plate 5, the impurities on the slag discharge plate 4 will fall onto the slag guide plate 5.

[0044] The slag guide plate 5 is arranged in the filter barrel 3. The slag guide plate 5 passes through the through hole and the slag discharge port. The slag guide plate 5 is inclined downward toward the slag discharge port. The inclined arrangement facilitates the discharge of impurities on the slag guide plate 5 out of the box body 1. The slag guide plate 5 can also be coated with an oleophobic coating, which is used to prevent the oil sludge mixture that falls onto the slag guide plate 5 from sticking to the slag guide plate 5.

[0045] The driving member 6 is arranged on the box body 1, and the driving member 6 is connected to the filter barrel 3. The driving member 6 is used to drive the filter barrel 3 to rotate. The driving member 6 is used to drive the filter barrel 3 to rotate around the horizontal central axis of the filter barrel 3. In addition to the form given below in the present invention, the driving member 6 that drives the filter barrel 3 to rotate can also directly use a motor to drive the filter barrel 3 to rotate; when the slag discharge plate 4 carrying impurities moves to a horizontal position, the longitudinal projection of the slag discharge plate 4 carrying impurities away from the inner wall of the filter barrel 3 is located on the slag guide plate 5, so that the impurities on the slag discharge plate 4 fall onto the slag guide plate 5. Specifically, when the driving member 6 drives the filter barrel 3 During the rotation process, it is necessary to ensure that the rotation speed of the filter barrel 3 is moderate. If the rotation speed of the filter barrel 3 is too high, the sludge mixture and other impurities in the filter barrel 3 will stick to the inner wall of the filter barrel 3 due to the action of centrifugal force, thereby causing the sludge mixture and impurities to fail to fall smoothly onto the slag guide plate 5. Furthermore, a speed sensor for detecting the rotation speed of the filter barrel 3 can be arranged in the box body 1, and the driving member 6 can be adjusted according to the detection value of the speed sensor to control the filter barrel 3 to be at a suitable rotation speed, so that the sludge mixture and other impurities on the slag discharge plate 4 can fall smoothly onto the slag guide plate 5.

[0046] As an alternative embodiment, a mounting ring 32 is provided at the opening of the filter barrel 3, one end of each slag discharge plate 4 is connected to the mounting ring 32, and the other end of each slag discharge plate 4 is connected to the inner wall of the filter barrel 3 away from the opening. Multiple slag discharge plates 4 are provided with leakage holes, and the setting of the leakage holes can make the sewage on the slag discharge plates 4 flow out during the process of salvaging and lifting impurities. The inner wall of the filter barrel 3 is provided with multiple side plates, and the multiple side plates correspond to the multiple slag discharge plates 4 one by one, and the side plates are fixedly connected to the slag discharge plates 4 The angle between the side plate and the slag discharge plate 4 is an acute angle, and a certain water storage space is formed at the angle between the side plate and the slag discharge plate 4. In the process of the slag discharge plate 4 lifting the impurities, a certain amount of water can be stored in the water storage space, so that when the slag discharge plate 4 is dumping the impurities, the stored water can simultaneously clean the slag discharge plate 4. The angle between the slag discharge plate 4 and the side plate is an acute angle, so as to avoid that when the slag discharge plate 4 moves with the filter barrel 3, the water in the water storage space has completely flowed out before the slag discharge plate 4 reaches the top of the slag guide plate 5.

[0047] As an alternative embodiment, the slag guide plate 5 is overlapped on the slag discharge port, and a spring rod is hinged on the side wall of the sewage bin 21. The movable rod end of the spring rod is hinged to the slag guide plate 5. The spring rod can withstand the impact of water flow and the erosion of sewage containing impurities when working, so that the device can be more durable. When the device is not working, the spring rod is in a retracted state, and a water receiving plate is provided on the spring rod. Specifically, the water receiving plate is arranged on a fixed rod of the spring rod connected to the side wall of the sewage bin 21. When the device is not working, the water receiving plate is in a horizontal state. When the device is working, the sewage Water entering the sewage bin 21 will impact the water receiving plate. Since the sewage is separated by the blades 611, the sewage will intermittently pass through the water receiving plate to exert downward pressure on the spring rod. Since the two ends of the spring rod are respectively hinged on the sewage bin 21 and the slag guide plate 5, the spring rod will intermittently deflect downward under the action of pressure, which will drive the slag guide plate 5 to vibrate. The sludge will not stay at one position on the slag guide plate 5 for too long, avoiding the sludge from sticking to the water receiving plate, so that the sludge and impurities on the slag guide plate 5 can be smoothly discharged to the outside of the box body 1.

[0048] As an alternative embodiment, the slag guide plate 5 is an arc-shaped plate, which is arranged in the middle position of the filter barrel 3. The slag guide plate 5 can better receive all impurities falling from the slag discharge plate 4, and a baffle is provided on the side of the slag guide plate 5 close to the opening of the filter barrel 3; the baffle is arranged to prevent impurities from flowing out from the other end of the slag guide plate 5 during the vibration of the slag guide plate 5, so that all types of impurities on the slag guide plate 5 can flow out of the box body 1 from the slag discharge port.

[0049] As an alternative embodiment, a water inlet tank 11 is provided at the top water inlet of the sewage tank 21, a gear ring 31 is provided on the filter barrel 3, and the driving member 6 includes:

[0050] The rotating shaft 61 is connected to the water inlet bin 11 in a transverse rotation manner. A plurality of blades 611 are provided on the rotating shaft 61, and the rotating shaft 61 passes through the water inlet bin 11. When the impact force of sewage entering the housing 1 is used to impact the blades 611 to drive the device to operate, the rotation of the filter barrel 3 can be monitored by a speed sensor. When the rotation speed of the filter barrel 3 is too fast, the rotation speed of the filter barrel 3 is reduced by reducing the flow rate of sewage entering the housing 1 to ensure that the filter barrel 3 can rotate at a normal speed. The design of this embodiment makes it unnecessary to use power components during the operation of the entire device. Only the height difference when sewage enters the device is used to drive the device to work. The use of the device is more energy-saving and environmentally friendly. In addition to the method of driving the rotating shaft 61 with blades 611, the driving motor can also be used to directly drive the rotating shaft 61 to rotate. However, in comparison, the method of driving with blades 611 is more energy-saving and environmentally friendly, and is adapted to the current needs of environmentally friendly production. In the actual production process, technicians in this field can flexibly select the specific driving method of the rotating shaft 61 according to the application environment of the product.

[0051] The transmission shaft 62 is connected in a transverse rotation in the connection port, and the output end of the rotating shaft 61 is connected to the transmission shaft 62 through a chain mechanism passing through the box body 1. The transmission shaft 62 is provided with a gear 621 meshing with the gear ring 31; specifically, the chain mechanism includes: a first sprocket, a second sprocket and a chain, the first sprocket is arranged on the rotating shaft 61, the second sprocket is arranged on the transmission shaft 62, and the chain is mounted on the first sprocket and the second sprocket.

[0052] As an alternative embodiment, a U-shaped baffle is provided on the surface of multiple blades 611, and the U-shaped baffle is used to form a water receiving trough with the blades 611. The inner wall of each water receiving trough is coated with an oleophobic coating. The setting of the oleophobic coating can prevent the oil sludge mixture in the untreated sewage from adhering to the water receiving trough, thereby affecting the normal rotation of the blades 611; the receiving trough can retain more sewage on the blades 611 in the early stage of sewage entering the device, so that the sewage can generate sufficient gravity to drive the rotating shaft 61 and the filter barrel 3 to rotate, thereby ensuring the continuity of the filter barrel 3 in treating the oil sludge and solid impurities.

[0053] As an alternative embodiment, cams 622 are provided on both sides of the gear 621 on the transmission shaft 62. The cams 622 are used to hit the filter barrel 3, so that impurities embedded in the filter holes of the filter barrel 3 or the sludge mixture adhered to the slag discharge plate 4 can fall off smoothly, and then the stubborn impurities embedded in the filter barrel 3 can be cleaned up to prevent the filter mesh from being blocked by sludge and other stubborn impurities.

[0054] As an alternative embodiment, the filter barrel 3 is made of stainless steel; the filter barrel 3 made of stainless steel has an overall light weight and strong structural rigidity, which makes the filter barrel 3 durable. At the same time, the overall side wall of the filter barrel 3 made of stainless steel is thinner and has a certain deformation ability. It can produce a certain deformation during the impact of the cam 622 to prevent the completely rigid filter barrel 3 from affecting the normal rotation of the cam 622, thereby affecting the normal operation of the entire device. The inner wall of the filter barrel 3 is coated with an oleophobic coating; the oleophobic coating is a coating applied to the metal surface to have an oleophobic effect, which is purchased on the market, for example; coating materials such as polytetrafluoroethylene and nano-silicon dioxide. The setting of the oleophobic coating can prevent the oil sludge mixture from adhering to the inner wall of the filter barrel 3 during the rotary filtration process of the filter barrel 3, and prevent the stubborn oil sludge from remaining and accumulating on the inner wall of the filter barrel 3 when the device is running for a long time, thereby affecting the normal filtering ability of the filter barrel 3.

[0055] As an alternative embodiment, a fixing ring is installed inside the filter barrel 3, and the fixing ring is located at the gear ring 31. The fixing ring fits with the inner ring of the gear ring 31, and the fixing ring can play a certain supporting role on the filter barrel 3, so that the gear ring 31 can be stably connected to the filter barrel 3, and the cross-section of the fixing ring is arc-shaped. Since the gear ring 31 is provided in the middle position of the filter barrel 3, the filter mesh cannot be set in the middle position of the filter barrel 3, and the middle position of the filter barrel 3 cannot be normally filtered. The cross-section of the fixing ring is set to be arc-shaped, so that during the rotation and filtering of the filter barrel 3, the sludge mixture and other impurities can move to both sides of the fixing ring, thereby avoiding the accumulation of sludge mixture due to the inability of the gear ring 31 to filter for a long time under the condition of use, thereby affecting the normal filtering ability of the filter barrel 3.

[0056] As an alternative embodiment, the rotation speed of the filter barrel 3 is 1r / min~3r / min. Under this rotation speed condition, during the rotation filtration of the filter barrel 3, the impurities in the filter barrel 3 will not stick to the inner wall of the filter barrel 3 due to the centrifugal force caused by the excessive rotation speed of the filter barrel 3, so that the sludge mixture and impurities can be smoothly removed by the slag discharge plate 4.

[0057] As an alternative embodiment, a water guide plate 7 is provided in the sewage bin 21, and the water guide plate 7 is T-shaped. The water guide plate 7 includes a water receiving portion and an extension portion which are perpendicular to each other. The water receiving portion is connected to the inner wall of the sewage bin 21, and the extension portion extends into the filter barrel 3. Both the water receiving portion and the extension portion are arc-shaped plates inclined downward toward the filter barrel 3. The setting of this type of water guide plate 7 can cause all sewage entering the sewage bin 21 to be filtered in the filter barrel 3, thereby preventing sewage from remaining in the sewage bin 21, causing accumulation of sludge mixture and other impurities, and further affecting the normal rotation of the filter barrel 3, so that the filtering work cannot be carried out smoothly.

[0058] As an alternative embodiment, a support platform is provided at the bottom of the inner cavity of the filter bin 22, and the filter barrel 3 is rotatably connected to the support platform. The support platform can support the filter barrel 3, and the setting of the support platform can cooperate with the partition 2 to jointly ensure that the rotation of the filter barrel 3 is more stable, so that the equipment can operate stably for a long time, and ensure that the filter barrel 3 can continuously and stably clean the sludge and impurities in the sewage, and the water outlet is located on the side of the support platform away from the partition 2. A strip through groove is provided at the bottom of the support platform, and the strip through groove is fitted with the bottom of the filter bin 22. The strip through groove extends toward the water outlet to form a trough body for filtered water to pass through. The bottom of the inner cavity of the filter bin 22 is an inclined surface inclined toward the water outlet. The setting of the inclined surface can facilitate the water filtered by the device to gather at the water outlet, and then facilitate the filtered water to be smoothly and completely discharged from the box 1.

[0059] Working principle and usage of this embodiment:

[0060] The present invention provides a device for filtering wastewater produced from injection wells in oil field development. When the device is in use, the wastewater produced from the injection wells enters the wastewater filtering device from the water inlet. The wastewater entering the device first falls on the blades 611, and the rotating shaft 61 is driven to rotate under the action of the gravity of the wastewater. The wastewater produced from the injection wells enters the filter barrel 3 through the water guide plate 7. Since the side wall of the filter barrel 3 is provided with filter mesh holes, the wastewater is filtered through the filter mesh holes, and the wastewater without impurities and sludge is finally discharged from the water outlet provided on the box body 1, and part of the wastewater containing impurities is still retained in the filter barrel 3. During the rotation process, the rotating shaft 61 drives the transmission shaft 62 to The transmission shaft 62 drives the filter barrel 3 to rotate through the gear 621 and the gear ring 31 arranged on the filter barrel 3. When the filter barrel 3 rotates, the multiple slag plates 4 arranged on the inner wall of the filter barrel 3 will be driven to move. The multiple slag plates 4 can move in the sewage containing impurities in the filter barrel 3, and then the solid impurities and sludge mixture in the sewage are removed from the sewage, and the impurities are carried along with the filter barrel 3 to rotate, so that the sewage can smoothly pass through the filter mesh holes on the filter barrel 3. During the rotation of the slag plates 4, since the slag plates 4 are provided with multiple leakage holes, a large amount of water in the impurities removed is discharged from the leakage holes, and then falls back into the filter barrel 3, and part of it is retained between the slag plates 4 and the side plates. The slag guide plate 5 is a kind of slag guide plate that is used for filtering the slag of the filter barrel 3. The slag guide plate 5 is a kind of slag guide plate that is used for filtering the slag of the filter barrel 3. The slag guide plate 5 is a kind of slag guide plate that is used for filtering the slag of the filter barrel 3. The slag guide plate 5 is a kind of slag guide plate that is used for filtering the slag of the filter barrel 3. The slag guide plate 5 is a kind of slag guide plate that is used for filtering the slag of the filter barrel 3. The impurities on the plate 4 can completely fall onto the slag guide plate 5, and the impurities stuck in the filter mesh in the filter barrel 3 can also fall onto the slag guide plate 5 to ensure the filtering effect of the filter barrel 3. When the sewage enters the box body 1, the sewage enters the sewage tank 21 and impacts the water receiving plate. Since the sewage is separated by the blades 611, the sewage intermittently passes through the water receiving plate to generate downward pressure on the spring rod. Since the two ends of the spring rod are respectively hinged to the sewage tank 21 and the slag guide plate 5, the spring rod is intermittently deflected downward by the pressure, which drives the slag guide plate 5 to vibrate, and finally various types of impurities on the slag guide plate 5 can be smoothly discharged out of the box body 1.

[0061] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, but not to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions for implementing the present invention, and should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for filtering wastewater produced from an injection well in oil field development, comprising a housing (1), characterized in that Also includes: A filter barrel (3) is horizontally arranged in the box body (1), the filter barrel (3) is provided with filter mesh holes in its circumference, the filter barrel (3) has an open end, a through hole is provided on a side of the filter barrel (3) away from the open end, and the filter barrel (3) is used to contain sewage; A plurality of slag discharge plates (4) are arranged on the inner wall of the filter barrel (3) along the length direction of the filter barrel (3), and the plurality of slag discharge plates (4) are inclined in the same clockwise or counterclockwise direction toward the inner wall of the filter barrel (3); A slag guide plate (5) is arranged in the filter barrel (3), one end of the slag guide plate (5) passes through the through hole and extends to the outside of the box body (1), so that impurities on the slag guide plate (5) are discharged outside the box body (1); A driving member (6) connected to the filter barrel (3) and used to drive the filter barrel (3) to rotate around the horizontal central axis of the filter barrel (3); As the filter barrel (3) rotates, when the slag discharge plate (4) moves to a horizontal position, the longitudinal projection of the slag discharge plate (4) away from the inner wall of the filter barrel (3) is located on the slag guide plate (5), so that impurities on the slag discharge plate (4) fall onto the slag guide plate (5).

2. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 1, characterized in that: A mounting ring (32) is provided at the opening of the filter barrel (3), one end of each of the slag discharge plates (4) is connected to the mounting ring (32), and the other end of each of the slag discharge plates (4) is connected to the inner wall of the filter barrel (3) away from the opening, multiple slag discharge plates (4) are provided with leakage holes, and the inner wall of the filter barrel (3) is provided with multiple side plates, the multiple side plates correspond to the multiple slag discharge plates (4) one by one, the side plates are fixedly connected to the slag discharge plates (4), and the angle between the side plates and the slag discharge plates (4) is acute.

3. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 1, characterized in that: A partition (2) is longitudinally arranged in the box body (1) for dividing the box body (1) into a sewage bin (21) and a filter bin (22); a water inlet is arranged at the top of the sewage bin (21); a water outlet is arranged on the side wall of the filter bin (22); a slag discharge port is arranged on the side wall of the filter bin (22) opposite to the partition (2); a mounting port is arranged on the partition (2); the filter barrel (3) is rotatably connected in the mounting port; the slag guide plate (5) is overlapped on the slag discharge port; a spring rod is hinged on the side wall of the sewage bin (21); a movable rod end of the spring rod is hinged to the slag guide plate (5); and a water receiving plate is arranged on the spring rod.

4. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 1, characterized in that: The filter barrel (3) is made of stainless steel, and an oleophobic coating is coated on the inner wall of the filter barrel (3).

5. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 3, characterized in that: The slag guide plate (5) is an arc-shaped plate, and the slag guide plate (5) is arranged at the middle position of the filter barrel (3). A baffle is provided on one side of the slag guide plate (5) close to the opening of the filter barrel (3).

6. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 3, characterized in that: A water inlet bin (11) is provided at the top water inlet of the sewage bin (21); a gear ring (31) is mounted on the filter barrel (3); and the driving member (6) comprises: a rotating shaft (61) and a transmission shaft (62); the rotating shaft (61) is connected to the water inlet bin (11) in a transversely rotatable manner; a plurality of blades (611) are provided on the rotating shaft (61); and the rotating shaft (61) passes through the water inlet bin (11); the transmission shaft (62) is connected to the connecting port in a transversely rotatable manner; the output end of the rotating shaft (61) is connected to the transmission shaft (62) via a chain mechanism passing through the housing (1); and a gear (621) meshing with the gear ring (31) is provided on the transmission shaft (62).

7. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 5, characterized in that: Cams (622) are provided on both sides of the gear (621) on the transmission shaft (62), and the cams (622) are used to strike the filter barrel (3).

8. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 5, characterized in that: A fixing ring is sleeved inside the filter barrel (3), the fixing ring is located at the gear ring (31), and the cross section of the fixing ring is arc-shaped.

9. The device for filtering produced wastewater from an oilfield development water injection well as claimed in claim 1, characterized in that: The rotation speed of the filter barrel (3) is 1 r / min to 3 r / min.

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