Petroleum drilling fluid filtering and recycling device

Abstract

The utility model discloses a petroleum drilling fluid filtering and recycling device which comprises a tank body and a tank cover, a liquid inlet pipe is arranged on the tank cover, a liquid outlet pipe is arranged at the bottom of the tank body, the petroleum drilling fluid filtering and recycling device further comprises a driving part, a rotating shaft, a first filtering assembly, a second filtering assembly and a third filtering assembly, one end of the rotating shaft is detachably connected with the power output end of the driving part, the first filtering assembly is movably installed at the liquid inlet pipe in a limited mode and is in transmission connection with the rotating shaft, the second filtering assembly is detachably installed on the rotating shaft, the third filtering assembly is arranged close to the liquid outlet pipe, and a brush is arranged on the second filtering assembly. By means of the first filtering assembly, large-size impurities in drilling fluid can be preliminarily filtered out, and the anti-blocking function is achieved; small-size impurities can be dynamically collected through the second filtering assembly, so that the filtering efficiency and effect are greatly improved; and the drilling fluid can be finely filtered through the third filtering assembly, so that the reliability of repeated use of the drilling fluid is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling engineering, in particular to an oil drilling fluid filtration and recovery device. Background Art

[0002] In the process of oil exploration and development, drilling operations are an essential part. As an important medium in the drilling process, drilling fluid undertakes key tasks such as cooling the drill bit, carrying drill cuttings, and maintaining the stability of the wellbore. As an important type of drilling fluid, oil-based drilling fluid has the advantages of high temperature resistance, salt and calcium erosion resistance, beneficial to wellbore stability, good lubricity, and little damage to oil and gas layers, and is widely used in the process of oil and gas exploitation. However, due to the high cost of drilling fluid, in order to save the exploitation cost, it is usually necessary to filter and recover it for reuse in actual exploitation and processing.

[0003] The applicant retrieved and obtained the following prior art. Specifically, the patent with the publication number CN220185068U discloses an oil drilling fluid filtration and recovery device, including a filtration tank. A liquid inlet pipe is provided at the top of the filtration tank. A first screen plate is provided inside the filtration tank. A scraper is provided on the surface of the first screen plate. Second screen plates are provided at both ends of the bottom of the first screen plate. A baffle is fixedly connected to the bottom of the second screen plate. An oil outlet pipe is connected to the bottom of the baffle. The oil outlet pipe penetrates through the filtration tank. The oil outlet pipe has a horizontal part, and a sealing pipe is sleeved outside the horizontal part. A coolant is provided between the sealing pipe and the oil outlet pipe. The device avoids the phenomenon of impurities accumulating on the surface of the first screen plate by the reciprocating movement of the push plate, ensuring the filtration effect of the drilling fluid.

[0004] As can be seen from the above patent, although the oil drilling fluid filtration and recovery device can avoid the phenomenon of impurities accumulating on the surface of the first screen plate and ensure the filtration effect of the drilling fluid, the filtration method it adopts is to pour the drilling fluid into the device and let it penetrate and filter by itself. This self-penetrating filtration method is simple, but the removal effect on fine particles is limited, making it inconvenient to quickly filter fine impurities in the drilling fluid, unable to ensure the filtration effect of the drilling fluid, and affecting subsequent reuse. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide an oil drilling fluid filtration and recovery device, aiming to solve the problem that the existing oil drilling fluid filtration and recovery device is inconvenient for quickly filtering fine impurities in the drilling fluid, unable to ensure the filtration effect of the drilling fluid, and affecting subsequent reuse.

[0006] To achieve the above object, the utility model provides an oil drilling fluid filtration and recovery device, which comprises a tank body and a tank cover. An inlet pipe is arranged on the tank cover, and an outlet pipe is arranged at the bottom of the tank body. The device further comprises a driving member, a rotating shaft, a first filtration assembly, a second filtration assembly and a third filtration assembly. The driving member is arranged on the tank cover. One end of the rotating shaft is detachably connected to the power output end of the driving member, and the other end of the rotating shaft extends into the tank body. The first filtration assembly is installed at the inlet pipe in a limited and movable manner and is in transmission connection with the rotating shaft. The second filtration assembly is detachably installed on the rotating shaft and can rotate relative to the tank body. The third filtration assembly is located in the tank body and is arranged close to the outlet pipe, and a brush for cleaning the third filtration assembly is arranged on the second filtration assembly.

[0007] Preferably, through grooves are formed on the two opposite side walls of the inlet pipe, and flanges are formed on the rotating shaft at positions corresponding to the through grooves. The first filtration assembly comprises a first filter mesh plate and an elastic member. The first filter mesh plate is slidably installed in the through grooves, and both sides of the first filter mesh plate extend out of the through grooves. Wherein, one side of the filter mesh plate is used for abutting against the flange, a limiting plate is formed on the other side of the first filter mesh plate, and both ends of the elastic member are fixedly connected to the tank body and the limiting plate respectively.

[0008] Preferably, the second filtration assembly comprises a plurality of mounting frames, a second filter mesh plate and a filter element. The plurality of mounting frames are detachably installed on the rotating shaft. A second filter mesh plate is arranged on both sides of each of the plurality of mounting frames. The mounting frames and the two second filter mesh plates enclose a placement space for placing the filter element, and an opening for the filter element to extend into is formed between the tops of the two second filter mesh plates and the mounting frames.

[0009] Preferably, the filter element comprises a fiber layer and two clamping plates. The fiber layer is located between the two clamping plates. The two clamping plates are detachably connected by a plurality of locking members, and the plurality of locking members are arranged in a rectangular array relative to any one of the clamping plates.

[0010] Preferably, a handle is arranged on the top of any one of the clamping plates.

[0011] Preferably, the brush is detachably installed at the bottom of any one of the clamping plates.

[0012] Preferably, the third filtration assembly comprises a third filter mesh plate. A limiting step is formed on the inner wall of the tank body at a position close to the outlet pipe. The limiting step is used for placing the third filter mesh plate, and an annular protrusion for sleeving with the rotating shaft is arranged on the third filter mesh plate.

[0013] Preferably, a plurality of legs are evenly and spaced along the circumferential direction on the outer wall of the bottom of the tank body.

[0014] Advantageous effects:

[0015] 1. The oil drilling fluid filtration and recovery device of the present utility model preliminarily filters the drilling fluid through the first filtration component, effectively filtering out impurities such as large-volume stone slag, gravel, or soil blocks in the drilling fluid. It can also drive the first filtration component to move through the driving member and the rotating shaft, thereby preventing the first filtration component from being blocked and ensuring the filtration effect of the drilling fluid. The structural design is simple and reasonable.

[0016] 2. The oil drilling fluid filtration and recovery device of the present utility model can collect small-volume impurities in the drilling fluid through the second filtration component, realizing secondary dynamic filtration of the drilling fluid, and greatly improving the filtration efficiency and filtration effect of the present utility model on the drilling fluid.

[0017] 3. The oil drilling fluid filtration and recovery device of the present utility model can perform three times of fine filtration on the drilling fluid through the third filtration component, thereby filtering out fine impurities in the drilling fluid, further improving the filtration effect of the present utility model on the drilling fluid, and ensuring the reliability of the drilling fluid during subsequent repeated use.

[0018] 4. The oil drilling fluid filtration and recovery device of the present utility model can synchronously clean the filtration surface of the third filtration component through the brush, thereby not only realizing continuous cleaning of the third filtration component and ensuring the fine filtration effect of the third filtration component on the drilling fluid, but also reducing the frequency of cleaning and replacing the third filtration component by reducing the risk of blockage of the third filtration component, thereby reducing the maintenance cost. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of an oil drilling fluid filtration and recovery device according to an embodiment of the present utility model from a perspective;

[0021] Figure 2 is a top view of an oil drilling fluid filtration and recovery device according to an embodiment of the present utility model;

[0022] Figure 3 is Figure 2 a cross-sectional view taken at A-A in

[0023] Figure 4 is Figure 3 The partial enlarged view at position B in

[0024] Figure 5 is Figure 3 The partial enlarged view at position C in

[0025] Figure 6 is the schematic diagram of the partial structure of an oil drilling fluid filtration and recovery device according to an embodiment of the present utility model;

[0026] Figure 7 is the exploded view of the partial structure in an oil drilling fluid filtration and recovery device according to an embodiment of the present utility model.

[0027] In the figure: 1 - tank body; 2 - tank cover; 3 - liquid inlet pipe; 4 - liquid outlet pipe; 5 - driving member; 6 - rotating shaft; 7 - brush; 8 - through groove; 9 - flange; 10 - first filter screen plate; 11 - elastic member; 12 - limiting plate; 13 - mounting rack; 14 - second filter screen plate; 15 - filter element; 16 - placement space; 17 - opening; 18 - fiber layer; 19 - clamping plate; 20 - handle; 21 - third filter screen plate; 22 - limiting step; 23 - support leg. Detailed implementation manners

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0030] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0032] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0034] Embodiment 1:

[0035] The present utility model provides an oil drilling fluid filtration and recovery device.

[0036] In an embodiment of the present utility model, an oil drilling fluid filtration and recovery device includes a tank body 1 and a tank cover 2. A liquid inlet pipe 3 is provided on the tank cover 2, and a liquid outlet pipe 4 is provided at the bottom of the tank body 1. It further includes a driving member 5, a rotating shaft 6, a first filtration component, a second filtration component, and a third filtration component. The driving member 5 is arranged on the tank cover 2. One end of the rotating shaft 6 is detachably connected to the power output end of the driving member 5, and the other end of the rotating shaft 6 extends into the tank body 1. The first filtration component is installed at the liquid inlet pipe 3 in a limited and movable manner and is in transmission connection with the rotating shaft 6. The second filtration component is detachably installed on the rotating shaft 6 and can rotate relative to the tank body 1. The third filtration component is located in the tank body 1 and is arranged close to the liquid outlet pipe 4, and a brush 7 for cleaning the third filtration component is provided on the second filtration component.

[0037] Specifically, as Figures 1 to 7As shown, in a petroleum drilling fluid filtering and recovery device of the utility model, the tank cover 2 is detachably mounted on the tank body 1 by means of threaded connection or the like. Since a liquid inlet pipe 3 is provided on the tank cover 2, drilling fluid can be transported into the tank body 1 through the liquid inlet pipe 3 to filter and recover the drilling fluid, and a liquid outlet pipe 4 is provided at the bottom of the tank body 1, through which the filtered drilling fluid can be output from the tank body 1 for reuse. Furthermore, since the tank cover 2 is provided with a driving member 5, the driving member 5 is a motor in the prior art (preferably a reduction motor), and one end of the rotating shaft 6 is detachably connected to the power output end of the driving member 5, and the other end of the rotating shaft 6 extends into the tank body 1, so that the rotating shaft 6 can rotate in the tank body 1 driven by the driving member 5; at the same time, when the drilling fluid enters the liquid inlet pipe 3, since the first filter component is installed at the liquid inlet pipe 3 in a limited and movable manner and is connected to the rotating shaft 6 in a transmission manner, the first filter component and the liquid inlet pipe 3 can be installed in a limited and movable manner by sliding engagement, that is, the first filter component is engaged in the liquid inlet pipe 3, and the first filter component can reciprocate relative to the liquid inlet pipe 3 driven by the driving member 5 and the rotating shaft 6, thereby not only the drilling fluid can be preliminarily filtered by the first filter component, and large volumes of impurities such as slag, gravel or soil in the drilling fluid can be effectively filtered out, but also the first filter component can be driven to move by the driving member 5 and the rotating shaft 6, thereby avoiding clogging of the first filter component and ensuring the filtering effect of the drilling fluid, and the structural design is simple and reasonable.

[0038] Furthermore, since the second filter assembly is detachably mounted on the rotating shaft 6 and can rotate relative to the tank body 1, the detachable connection between the second filter assembly and the rotating shaft 6 can be threaded, thereby facilitating the disassembly and maintenance of the second filter assembly. After the drilling fluid is initially filtered by the first filter assembly, the drilling fluid flows into the inner cavity of the tank body 1. At this time, the second filter assembly rotates relative to the tank body 1 under the drive of the driving member 5 and the rotating shaft 6, thereby being able to collect small volumes of impurities in the drilling fluid, thereby achieving secondary dynamic filtration of the drilling fluid, and greatly improving the filtration efficiency and filtration effect of the utility model on the drilling fluid. In addition, by arranging the third filter assembly at a position close to the liquid outlet pipe 4 in the tank body 1, the drilling fluid can be finely filtered three times, thereby filtering out fine impurities in the drilling fluid, further improving the filtration effect of the utility model on the drilling fluid, and ensuring the reliability of the drilling fluid during subsequent repeated use.

[0039] It can be understood that since the second filter assembly is provided with a brush 7, when the second filter assembly rotates under the drive of the driving member 5 and the rotating shaft 6, the filter surface of the third filter assembly can be cleaned synchronously by the brush 7, thereby not only achieving continuous cleaning of the third filter assembly and ensuring the fine filtering effect of the third filter assembly on the drilling fluid, but also reducing the risk of clogging of the third filter assembly to reduce the frequency of cleaning and replacing the third filter assembly, thereby reducing maintenance costs.

[0040] Compared with the prior art, an oil drilling fluid filtration and recovery device of the utility model can achieve efficient triple-stage filtration of the drilling fluid. That is, the first filtration component can initially filter out large-volume impurities in the drilling fluid and realize the anti-blocking function of the first filtration component through the rotating shaft 6; the second filtration component can dynamically collect small-volume impurities, greatly improving the filtration efficiency and effect; the third filtration component can finely filter the drilling fluid to ensure the reliability of the drilling fluid during subsequent use. In addition, the brush 7 can clean and maintain the filtration effect of the third filtration component on the drilling fluid, reducing the risk of blockage of the third filtration component and reducing the maintenance cost.

[0041] In an embodiment, through grooves 8 are formed on the tube walls on opposite sides of the liquid inlet pipe 3, and flanges 9 are formed at positions corresponding to the through grooves 8 on the rotating shaft 6. The first filtration component includes a first filter mesh plate 10 and an elastic member 11. The first filter mesh plate 10 is slidably installed in the through groove 8, and both sides of the first filter mesh plate 10 extend out of the through groove 8. Among them, one side of the filter mesh plate is used to abut against the flange 9, a limiting plate 12 is formed on the other side of the first filter mesh plate 10, and both ends of the elastic member 11 are fixedly connected to the tank body 1 and the limiting plate 12 respectively.

[0042] Specifically, as Figures 1 to 6 shown, since the through grooves 8 are formed on the tube walls on opposite sides of the liquid inlet pipe 3, the first filter mesh plate 10 in the first filtration component can be slidably installed in the through groove 8, and the structural design is simple and reasonable. When the driving member 5 drives the rotating shaft 6 to rotate, the flange 9 on the rotating shaft 6 abuts against one side of the first filter mesh plate 10, causing the first filter mesh plate 10 to move relative to the feed pipe in the through groove 8. At this time, the elastic member 11 undergoes compressive deformation; when the flange 9 is disengaged from abutting against the first filter mesh plate 10 under the continuous rotation of the rotating shaft 6, the elastic member 11 rebounds and rebounds the first filter mesh plate 10 in the direction close to the flange 9 until the limiting plate 12 abuts against the tube wall of the feed pipe. It can be seen that the first filter mesh plate 10 can reciprocally slide in the through groove 8 under the action of the flange 9 and the elastic member 11, so that the first filter mesh plate 10 has a relatively dynamic filtering surface, effectively preventing the first filter mesh plate 10 from being blocked by large-volume impurities, ensuring the continuity of filtration, and reducing the frequency of manual cleaning. In addition, the elastic member 11 can be selected as a spring in the prior art. The spring has the characteristics of compact structure, easy material selection, and large elastic deformation force, which is convenient for driving the first filter mesh plate 10 to move in the reverse direction.

[0043] In one embodiment, the second filtering component includes a plurality of mounting brackets 13, a second filter mesh plate 14, and a filter element 15. The plurality of mounting brackets 13 are detachably mounted on the rotating shaft 6. A second filter mesh plate 14 is provided on both sides of the plurality of mounting brackets 13. The mounting brackets 13 and the two second filter mesh plates 14 enclose a placement space 16 for placing the filter element 15, and an opening 17 for the filter element 15 to extend into is formed between the tops of the two second filter mesh plates 14 and the mounting brackets 13.

[0044] Specifically, as Figure 7 shown, the detachable installation method of the rotating shaft 6 and the plurality of mounting brackets 13 can adopt threaded connection, which is convenient for disassembly and assembly and has a firm connection. Further, by providing second filter mesh plates 14 on both sides of the plurality of mounting brackets 13, the two filter mesh plates can enclose a placement space 16 for placing the filter element 15 with one mounting bracket 13, and the structural design is simple and reasonable. At the same time, when the rotating shaft 6 drives the mounting brackets 13 to rotate, the drilling fluid enters the placement space 16 through the second filter mesh plate 14 on one side of the mounting brackets 13. At this time, the filter element 15 in the placement space 16 can filter out small-volume impurities in the drilling fluid and collect them dynamically, and the drilling fluid after secondary filtration flows out through the second filter mesh plate 14 on the other side, thereby realizing the secondary filtration of the drilling fluid, improving the filtration effect of the drilling fluid, having a fast filtration efficiency, and being reliable in use. It can be understood that since an opening 17 for the filter element 15 to extend into is formed between the tops of the two second filter mesh plates 14 and the mounting brackets 13, it is convenient for the staff to disassemble, install or replace the filter element 15, and the operation is simple and convenient.

[0045] In one embodiment, specifically, as Figure 7 shown, the filter element 15 includes a fiber layer 18 and two clamping plates 19. The fiber layer 18 is located between the two clamping plates 19. The two clamping plates 19 are detachably connected by a plurality of locking members, and the plurality of locking members are arranged in a rectangular array relative to any one of the clamping plates 19, so as to firmly clamp the fiber layer 18 and ensure the filtering effect of the filter element 15 on small-volume impurities. It should be noted that the fiber layer 18 can be made of synthetic fibers (such as polyester fibers, polypropylene fibers) or natural fibers (such as cotton fibers, linen fibers, etc.), that is, these materials are made into fiber meshes or fiber pads, and the impurity particles in the drilling fluid are captured through the physical interception and adsorption effects between the fibers. In addition, the filter element 15 can also be made of porous adsorption materials (such as activated carbon, porous ceramics or molecular sieves, etc.).

[0046] In one embodiment, specifically, as Figure 7 shown, a handle 20 is provided on the top of any one of the clamping plates 19, so as to facilitate the staff to disassemble and install the filter element 15 and is conducive to the maintenance, cleaning or replacement of the filter element 15.

[0047] In one embodiment, specifically, as Figure 7As shown, a brush 7 is detachably installed at the bottom of any clamping plate 19, so as to improve the cleaning effect on the third filter assembly, ensure the filtering performance of the third filter assembly, and effectively prevent the third filter assembly from being blocked by impurities.

[0048] In one embodiment, the third filter assembly includes a third filter mesh plate 21. A limiting step 22 is formed on the inner wall of the tank body 1 near the liquid outlet pipe 4. The limiting step 22 is used to place the third filter mesh plate 21, and a ring-shaped protrusion for sleeving with the rotating shaft 6 is provided on the third filter mesh plate 21. Specifically, as Figures 1 to 7 shown, the circumferential limit of the third filter mesh plate 21 can be realized through the limiting step 22; at the same time, since a ring-shaped protrusion for sleeving with the rotating shaft 6 is provided on the third filter mesh plate 21, on the one hand, the other end of the rotating shaft 6 can be limited through the ring-shaped protrusion to improve the smoothness of the rotation of the rotating shaft 6, and on the other hand, the third filter mesh plate 21 can be axially limited through the rotating shaft 6, thereby ensuring the installation stability of the third filter mesh plate 21 on the limiting step 22.

[0049] In one embodiment, specifically, as Figure 1 shown, a plurality of legs 23 are evenly and spaced along the circumferential direction on the outer wall of the bottom of the tank body 1, so as to support the tank body 1 at multiple points, improve the placement stability of the tank body 1, and the structural design is simple and reasonable.

[0050] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A petroleum drilling fluid filtering and recovery device, comprising a tank body (1) and a tank cover (2), wherein the tank cover (2) is provided with a liquid inlet pipe (3), and the bottom of the tank body (1) is provided with a liquid outlet pipe (4), characterized in that: The tank body (1) further comprises a driving member (5), a rotating shaft (6), a first filter assembly, a second filter assembly and a third filter assembly, wherein the driving member (5) is arranged on the tank cover (2), one end of the rotating shaft (6) is detachably connected to the power output end of the driving member (5), the other end of the rotating shaft (6) extends into the tank body (1), the first filter assembly is movably mounted on the liquid inlet pipe (3) and is transmission-connected to the rotating shaft (6), the second filter assembly is detachably mounted on the rotating shaft (6) and can rotate relative to the tank body (1), the third filter assembly is located in the tank body (1) and is arranged close to the liquid outlet pipe (4), and the second filter assembly is provided with a brush (7) for cleaning the third filter assembly.

2. The oil drilling fluid filtering and recovery device according to claim 1, characterized in that: The liquid inlet pipe (3) is provided with through grooves (8) on the opposite side walls thereof, and a flange (9) is formed on the rotating shaft (6) at a position corresponding to the through groove (8). The first filter assembly comprises a first filter screen plate (10) and an elastic member (11). The first filter screen plate (10) is slidably installed in the through groove (8), and both sides of the first filter screen plate (10) extend out of the through groove (8), wherein one side of the filter screen plate is used to abut against the flange (9), and a limiting plate (12) is formed on the other side of the first filter screen plate (10), and both ends of the elastic member (11) are fixedly connected to the tank body (1) and the limiting plate (12) respectively.

3. The oil drilling fluid filtering and recovery device according to claim 1, characterized in that: The second filter assembly comprises a plurality of mounting frames (13), a second filter screen plate (14) and a filter element (15); the plurality of mounting frames (13) are detachably mounted on the rotating shaft (6); a second filter screen plate (14) is disposed on both sides of the plurality of mounting frames (13); the mounting frames (13) and the two second filter screen plates (14) form a placement space (16) for placing the filter element (15); and an opening (17) for the filter element (15) to extend into is formed between the tops of the two second filter screen plates (14) and the mounting frames (13).

4. The oil drilling fluid filtering and recovery device according to claim 3, characterized in that: The filter element (15) comprises a fiber layer (18) and two clamping plates (19), wherein the fiber layer (18) is located between the two clamping plates (19), and the two clamping plates (19) are detachably connected via a plurality of locking members, and the plurality of locking members are arranged in a rectangular array relative to any of the clamping plates (19).

5. The oil drilling fluid filtering and recovery device according to claim 4, characterized in that: A handle (20) is provided on the top of any one of the clamping plates (19).

6. The oil drilling fluid filtering and recovery device according to claim 5, characterized in that: The brush (7) is detachably mounted on the bottom of any clamping plate (19).

7. The oil drilling fluid filtering and recovery device according to claim 1, characterized in that: The third filter assembly comprises a third filter screen plate (21); a limiting step (22) is formed on the inner wall of the tank body (1) near the liquid outlet pipe (4); the limiting step (22) is used to place the third filter screen plate (21); and the third filter screen plate (21) is provided with an annular protrusion for sleeve-engaging with the rotating shaft (6).

8. A petroleum drilling fluid filtering and recovery device according to any one of claims 1 to 7, characterized in that: A plurality of legs (23) are evenly and spaced apart on the outer wall of the bottom of the tank body (1) along its circumference.

Images