Oil drilling engineering drilling fluid screening apparatus

Abstract

This invention provides a drilling fluid screening device for oil drilling engineering, including a base, a squirrel-cage rotary drum, a drive structure, guide rollers, a wire mesh belt, and a suction assembly. A receiving groove is provided on the top of the base. The squirrel-cage rotary drum is rotatably mounted on the base. The drive structure drives the squirrel-cage rotary drum to rotate. Two guide rollers are provided, each rotatably mounted on the base. The wire mesh belt is annularly wound around the outer periphery of the squirrel-cage rotary drum and each guide roller, forming an extension end extending outside the receiving groove. The wire mesh belt forms a filtration section at the lower half of the squirrel-cage rotary drum for filtering the drilling fluid entering the drum. The suction assembly can extract the filtered drilling fluid from inside the squirrel-cage rotary drum. The drilling fluid screening device provided by this invention can continuously remove mud and sand impurities from the drilling fluid, ensuring the recycling of the drilling fluid, saving manpower and resources, and maintaining drilling efficiency.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment technology, specifically relating to a drilling fluid screening device for oil drilling engineering. Background Technology

[0002] Drilling fluid is a key working fluid that is circulated in drilling engineering. It plays a vital and multifunctional role throughout the drilling process and is an indispensable component for safe and efficient drilling.

[0003] In existing technologies, drilling fluids often carry sediment and impurities upon return, necessitating filtration equipment to prevent clogging during subsequent reuse. However, these filtration devices typically use fixed, often multiple, screens to remove sediment and impurities. While this method ensures filtration, the accumulation of sediment on the screens over time significantly reduces filtration efficiency, requiring shutdown for cleaning. Since filtration equipment is usually enclosed, disassembly is time-consuming and labor-intensive, impacting drilling efficiency. Summary of the Invention

[0004] This invention provides a drilling fluid screening device for oil drilling engineering, which aims to solve the problem of poor practicality of existing drilling fluid screening devices due to easy clogging after long-term use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a drilling fluid screening device for oil drilling engineering, comprising:

[0006] The base has a receiving groove on the top, which is used to introduce and hold the drilling fluid to be screened.

[0007] The rat cage rotating cylinder is rotatably mounted on the base, and its axis is set horizontally;

[0008] A drive structure, mounted on the base, is used to drive the rotating drum of the mouse cage to rotate;

[0009] Two guide rollers are provided, each of which is arranged parallel to and spaced apart from the rotating drum of the squirrel cage, and is rotatably mounted on the base;

[0010] The wire mesh belt is wound in a ring around the outer periphery of the squirrel cage drum and each of the guide rollers, and forms an extended end that extends to the outside of the receiving groove; the wire mesh belt forms a filter section at the lower half of the squirrel cage drum to filter the drilling fluid entering the squirrel cage drum; the wire mesh belt removes impurities attached to the outer surface as the squirrel cage drum rotates.

[0011] The suction assembly has a suction end that extends into the rat cage rotating drum, and the suction assembly is used to extract the filtered drilling fluid from inside the rat cage rotating drum.

[0012] The axes of the rat cage rotating drum and each of the guide rollers are all located on the same horizontal plane, and the diameter of the guide rollers is smaller than the outer diameter of the rat cage rotating drum.

[0013] The rat cage rotating cylinder includes:

[0014] Two rotating uprights are provided, which are arranged in parallel and spaced apart. Each rotating upright is provided with a transition shaft that is rotatably connected to the base.

[0015] Multiple connecting posts are provided, each of which is horizontally arranged and spaced annularly around the axis of the adapter shaft; each connecting post is connected to two rotating vertical plates at both ends; each connecting post is used for the wire mesh belt to be wound.

[0016] One of the rotating plates has a through hole through which the suction assembly passes;

[0017] The driving structure includes:

[0018] The speed reducer is fixed on the base and is poweredly connected to another of the aforementioned adapter shafts;

[0019] A driver, connected to the reducer, is used to provide power to the reducer;

[0020] The suction assembly includes:

[0021] A horizontal tube, one end of which extends through the through hole into the rotating cylinder of the rat cage;

[0022] A vertical tube, with its top end connected to the horizontal tube and its bottom end extending downwards, the bottom end of which is the suction end;

[0023] A water pump is installed on the horizontal pipe;

[0024] The drilling fluid screening equipment for oil drilling engineering also includes a scraping structure, which is disposed on the receiving tank and close to the guide roller located outside the receiving tank. The scraping structure has a brush portion that extends upward and contacts the wire mesh belt.

[0025] The drilling fluid screening equipment for oil drilling engineering also includes an adjustment structure, which is disposed in the receiving tank. The adjustment structure divides the receiving tank into a filter tank and a buffer tank for placing the rat cage rotating drum. The adjustment structure is used to adjust the liquid level in the filter tank.

[0026] The filter tank has an inlet for introducing drilling fluid to be screened.

[0027] The adjustment structure includes:

[0028] Two fixed baffles are provided, both of which are vertically arranged and spaced apart; a sliding cavity with an open top is formed between the two fixed baffles.

[0029] A sliding baffle is slidably disposed within the sliding cavity;

[0030] A rotating shaft is located above the sliding baffle and is rotatably connected to the receiving groove; the rotation axis of the rotating shaft is arranged parallel to the rotation axis of the guide roller.

[0031] At least two traction ropes are provided, with each traction rope spaced apart on the rotating shaft; each traction rope is wound around the rotating shaft, and its free end is connected to the top of the sliding baffle.

[0032] The worm gear adjusting component is fixed to the outer wall of the receiving groove and connected to the rotating shaft.

[0033] In one possible implementation, both the filter tank and the buffer tank are provided with discharge ports at their bottoms.

[0034] In this implementation, a receiving tank is provided on the base to ensure the storage of drilling fluid returned from drilling. A squirrel-cage rotary drum is installed in the receiving tank, along with two guide rollers for the wire mesh belt to wind around. When combined, the wire mesh belt forms a dynamic filter section immersed in the drilling fluid, and also forms an extension end extending outside the receiving tank. The drilling fluid enters the squirrel-cage rotary drum from the receiving tank through the filter section under pressure differential. The wire mesh belt rotates under the drive of the squirrel-cage rotary drum, thus dynamically setting the filter section. During the filtration process, mud and impurities adhering to the outer surface of the wire mesh belt are carried away from the drilling fluid, and as the wire mesh belt is conveyed, these mud and impurities are discharged to the outside of the receiving tank at the extension end. This method prevents the gradual accumulation of mud and sand impurities in the containment tank, ensuring that as mud and sand impurities are continuously screened and filtered out of the drilling fluid, they are carried to the outside, guaranteeing the recycling of the drilling fluid, saving manpower and resources, and maintaining drilling efficiency. The suction component can extract the drilling fluid from the squirrel-cage rotary drum, allowing the treated drilling fluid to be used directly. Furthermore, the suction component ensures that the liquid level in the squirrel-cage rotary drum remains lower than the liquid level in the containment tank, thus guaranteeing the automatic filtration effect under pressure differential. Attached Figure Description

[0035] Figure 1 A schematic diagram of the drilling fluid screening equipment for oil drilling engineering provided in this embodiment of the invention. Figure 1 ;

[0036] Figure 2 A schematic diagram of the drilling fluid screening equipment for oil drilling engineering provided in this embodiment of the invention. Figure 2 (Hidden mesh tape)

[0037] Figure 3 This is a cross-sectional structural schematic diagram of a drilling fluid screening device for oil drilling engineering provided in an embodiment of the present invention;

[0038] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the drilling fluid screening equipment in an oil drilling project (with the wire mesh belt hidden).

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Base; 11. Receiving tank; 111. Filter tank; 112. Buffer tank; 12. Inlet port; 13. Outlet port; 14. Circulation pipeline; 15. Circulation pump; 16. Support;

[0041] 20. Mouse cage rotating cylinder; 21. Rotating upright plate; 22. Connecting column; 23. Adapter shaft;

[0042] 30. Drive structure; 31. Reducer; 32. Driver;

[0043] 40. Guide rollers;

[0044] 50. Wire mesh belt; 51. Extended end; 52. Filter section;

[0045] 60. Suction assembly; 61. Horizontal pipe; 62. Vertical pipe; 63. Water pump;

[0046] 70. Scraping structure; 71. Movable plate; 72. Brush strip;

[0047] 80. Adjustment structure; 81. Fixed baffle; 82. Sliding baffle; 83. Rotating shaft; 84. Traction rope; 85. Worm gear adjusting component. Detailed Implementation

[0048] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0049] Please refer to the following: Figure 1 and Figure 2The drilling fluid screening equipment for oil drilling engineering provided by the present invention will now be described. The drilling fluid screening equipment for oil drilling engineering includes a base 10, a squirrel-cage rotating drum 20, a drive structure 30, guide rollers 40, a wire mesh belt 50, and a suction assembly 60. The top of the base 10 is provided with a receiving groove 11, which can be used to introduce and hold the drilling fluid to be screened. The squirrel-cage rotating drum 20 is rotatably mounted on the base 10, and its axis is horizontal. The drive structure 30 is mounted on the base 10 and can drive the squirrel-cage rotating drum 20 to rotate. Two guide rollers 40 are provided, each guide roller 40 being parallel and spaced apart from the squirrel-cage rotating drum 20, and both being rotatably mounted on the base 10. The wire mesh belt 50 is annularly wound around the outer periphery of the squirrel-cage rotating drum 20 and each guide roller 40, and forms an extension end 51 extending to the outside of the receiving groove 11. The wire mesh belt 50 forms a filter section 52 at the lower half of the squirrel cage drum 20 to filter the drilling fluid entering the squirrel cage drum 20. As the squirrel cage drum 20 rotates, the wire mesh belt 50 removes impurities adhering to its outer surface. The suction assembly 60 has a suction end extending into the squirrel cage drum 20, and the suction assembly 60 is capable of extracting the filtered drilling fluid from inside the squirrel cage drum 20.

[0050] The drilling fluid screening equipment for oil drilling engineering provided in this embodiment works on the following principle: During the drilling process, the drilling fluid returning to the bottom is fed into the receiving tank 11. After the level of the drilling fluid rises and comes into contact with the filter section 52, a pressure difference is formed inside and outside the filter section 52. The drilling fluid then passes through the filter section 52 and enters the squirrel cage drum 20, where it is filtered to remove mud and sand impurities. As the drive structure 30 drives the squirrel cage drum 20 to rotate continuously, the wire mesh belt 50 rotates around the squirrel cage drum 20 and each guide roller 40, thereby carrying away the mud and sand impurities attached to the wire mesh belt 50. At the same time, the mud and sand impurities are carried out of the receiving tank 11 through the protruding end 51 of the wire mesh belt 50. The suction assembly 60 can extract the processed drilling fluid through the suction end that extends into the squirrel cage drum 20 and reuse it in drilling.

[0051] The drilling fluid screening equipment for oil drilling engineering provided in this embodiment, compared with the prior art, has a receiving tank 11 on the base 10 to ensure the storage of drilling fluid returned from drilling. A squirrel-cage rotary drum 20 is installed in the receiving tank 11, and two guide rollers 40 are installed in conjunction with the squirrel-cage rotary drum 20 for the wire mesh belt 50 to be wound around. When these three components are combined, the wire mesh belt 50 forms a dynamic filter section 52 immersed in the drilling fluid, and also forms an extension end 51 extending out of the receiving tank 11. The drilling fluid enters the squirrel-cage rotary drum 20 from the receiving tank 11 through the filter section 52 under pressure difference. The wire mesh belt 50 rotates under the drive of the squirrel-cage rotary drum 20, thus making the filter section 52 dynamically configured. During the filtration process, mud and sand impurities adhering to the outer surface of the wire mesh belt 50 are carried away from the drilling fluid, and as the wire mesh belt 50 is conveyed, these mud and sand impurities are discharged to the outside of the receiving tank 11 at the extension end 51. This method prevents the gradual accumulation of mud and sand impurities in the receiving tank 11, ensuring that as the drilling fluid is screened and filtered, the mud and sand impurities are continuously carried out to the outside, guaranteeing the recycling of the drilling fluid, saving manpower and resources, and ensuring drilling efficiency. The suction assembly 60 can extract the drilling fluid from the squirrel cage drum 20, allowing the treated drilling fluid to be used directly. Furthermore, the suction assembly 60 ensures that the liquid level in the squirrel cage drum 20 remains lower than the liquid level in the receiving tank 11, thus guaranteeing the automatic filtration effect under pressure differential.

[0052] In some embodiments, the aforementioned squirrel cage drum 20 and each guide roller 40 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 The axes of the squirrel cage rotating drum 20 and each guide roller 40 are all located on the same horizontal plane, and the diameter of the guide roller 40 is smaller than the outer diameter of the squirrel cage rotating drum 20.

[0053] The rotation axis of each guide roller 40 is on the same horizontal plane as the rotation axis of the squirrel cage drum 20, and the diameter of the guide roller 40 is smaller than the outer diameter of the squirrel cage drum 20. This ensures that after the wire mesh belt 50 is wrapped, an upward inclined surface is formed at the top, starting from the squirrel cage drum 20 and moving downward. This upward inclined surface allows a small amount of drilling fluid adhering to the wire mesh belt 50 to flow back into the receiving tank 11. It also prevents mud and sand impurities moving downward on the surface of the wire mesh belt 50 and being discharged to the outside of the receiving tank 11 through the protruding end 51 formed by the wire mesh belt 50.

[0054] In this embodiment, two guide rollers 40 are provided, one of which is located outside the receiving groove 11, and the other guide roller 40 is located close to the squirrel cage rotating drum 20. (See also...) Figure 3This structure ensures that the wire mesh belt 50 between the two guide rollers 40 forms a downward inclined surface that starts from the guide rollers 40 outside the receiving groove 11 and is set at an angle upward. This downward inclined surface can, to a certain extent, allow any mud and sand impurities remaining on the surface of the wire mesh belt 50 to fall into the receiving groove 11. Specifically, a small amount of drilling fluid falls from the upward inclined surface and directly onto the downward inclined surface, thereby removing the mud and sand impurities remaining on the downward inclined surface, ensuring the cleanliness of the wire mesh belt 50, and thus ensuring the filtration effect.

[0055] In addition, one of the guide rollers 40 is positioned close to the cage drum 20, which ensures an increased contact area between the wire mesh belt 50 and the cage drum 20, i.e., the area of ​​the filter section 52. This structure ensures that the wire mesh belt 50 covers the outer periphery of the lower half of the cage drum 20, thereby increasing the screening and filtration area and ensuring the screening and filtration speed.

[0056] In this embodiment, a bracket 16 can be provided on the base 10 for rotatably connecting the rat cage rotating cylinder 20 and each guide roller 40, as shown in the figure. Figure 2 .

[0057] In some embodiments, the aforementioned rat cage rotating drum 20 can be adopted as follows: Figure 2 and Figure 3 The structure shown. See also Figure 2 and Figure 3 The rat cage rotating cylinder 20 includes rotating upright plates 21 and connecting columns 22. Two rotating upright plates 21 are provided, arranged parallel and spaced apart. Each rotating upright plate 21 has a connecting shaft 23 rotatably connected to the base 10. One of the rotating upright plates 21 has a through hole through which the suction assembly 60 passes. Multiple connecting columns 22 are provided, each horizontally arranged and spaced annularly around the axis of the connecting shaft 23. Both ends of each connecting column 22 are connected to two rotating upright plates 21 respectively. Each connecting column 22 is wound with a wire mesh belt 50.

[0058] The two rotating uprights 21 ensure the fixed connection of each connecting column 22. Simultaneously, the two rotating uprights 21 also ensure that the assembled rat cage rotating cylinder 20 can be rotatably connected to the base 10. Specifically, a bracket 16 for the rat cage rotating cylinder 20 to rotate and connect can be provided on the base 10, as shown in [reference needed]. Figure 1 and Figure 2 Multiple connecting posts 22 ensure the wrapping of the wire mesh belt 50, while also preventing the drilling fluid from being intercepted during its passage. The structure has high strength and can guarantee the transmission of power.

[0059] One of the adapter shafts 23 has a through hole, which allows the suction component 60 to pass through without directly interfering with the squirrel cage rotating drum 20. The other adapter shaft 23 is connected to the drive structure 30, which ensures that the squirrel cage rotating drum 20 can rotate stably under the drive of the drive structure 30.

[0060] In this embodiment, the rotating upright plate 21 can be a circular plate.

[0061] In some embodiments, the driving structure 30 described above may adopt the following... Figure 1 and Figure 4 The structure shown. See also Figure 1 and Figure 4 The drive structure 30 includes a reducer 31 and a driver 32. The reducer 31 is fixed on the base 10 and is poweredly connected to another adapter shaft 23. The driver 32 is connected to the reducer 31 and can provide power to the reducer 31.

[0062] The driver 32 can be a drive motor, while the reducer 31 can reduce the speed of the driver 32, thereby ensuring the smooth rotation of the squirrel cage drum 20 and ensuring the screening and filtration effect of the drilling fluid. The structure of the reducer 31 and the driver 32 is prior art and well known to those skilled in the art, and will not be described in detail here.

[0063] In some embodiments, the suction component 60 described above may employ, for example... Figure 2 and Figure 4 The structure shown. See also Figure 2 and Figure 4 The suction assembly 60 includes a horizontal pipe 61, a vertical pipe 62, and a water pump 63. One end of the horizontal pipe 61 extends into the rotating drum 20 of the rat cage through a through hole. The top end of the vertical pipe 62 is connected to the horizontal pipe 61, and the bottom end extends downward, with the bottom end of the vertical pipe 62 serving as the suction end. The water pump 63 is mounted on the horizontal pipe 61.

[0064] The horizontal pipe 61 can be extended into the squirrel cage drum 20 through the through hole, while the vertical pipe 62 can be extended downward to the bottom of the squirrel cage drum 20, thereby ensuring the extraction of drilling fluid in the squirrel cage drum 20, ensuring the formation of a liquid level difference between the squirrel cage drum 20 and the receiving tank 11, ensuring continuous filtration and screening of drilling fluid, and ensuring filtration and screening effect and efficiency.

[0065] The water pump 63 is installed on the horizontal pipe 61 to ensure the extraction of drilling fluid.

[0066] In this embodiment, one end of the horizontal pipe 61 can be directly connected to a flexible pipe to ensure the reuse of drilling fluid.

[0067] In some embodiments, see Figure 3The drilling fluid screening equipment for oil drilling engineering also includes a scraping structure 70, which is disposed on the receiving tank 11 and close to the guide roller 40 located on the outside of the receiving tank 11. The scraping structure 70 has a brush part that extends upward and contacts the wire mesh belt 50.

[0068] The brush section ensures that the mud and sand impurities remaining on the wire mesh belt 50 are cleaned, thus ensuring the cleanliness of the wire mesh belt 50 and the subsequent filtration and screening effect.

[0069] Specifically, the scraping structure 70 may include a movable plate 71, which is fixedly mounted on the side of the receiving groove 11 near the protruding end 51. The movable plate 71 is vertically arranged with its top end extending upward. Brush strips 72 are evenly arranged on the top end of the movable plate 71. These brush strips 72 are brush parts that are in continuous contact with the wire mesh belt 50.

[0070] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The drilling fluid screening equipment for oil drilling engineering also includes an adjustment structure 80, which is installed in the receiving tank 11. The adjustment structure 80 divides the receiving tank 11 into a filter tank 111 for placing the rat cage rotating drum 20 and a buffer tank 112. The adjustment structure 80 can adjust the liquid level in the filter tank 111.

[0071] The filter tank 111 has an inlet port 12 for introducing drilling fluid to be screened.

[0072] Since the filter section 52 is arc-shaped and has a certain height in the vertical direction, the factor determining the filtration efficiency is the difference in liquid level height inside and outside the filter section 52. The adjustment structure 80 can divide the receiving tank 11 into a filter tank 111 and a buffer tank 112. The adjustment structure 80 can adjust the liquid level height in the filter tank 111. When too much drilling fluid enters the filter tank 111, or the amount of liquid entering per unit time is greater than the amount of liquid discharged by the suction component 60, or the liquid level is higher than the set liquid level, the drilling fluid can be directly introduced into the buffer tank 112 to ensure a constant liquid level height in the filter tank 111, thereby ensuring a constant pressure difference inside and outside the filter section 52, and thus ensuring the filtration effect and filtration efficiency of the drilling fluid.

[0073] In this embodiment, it should be noted that a circulation pipeline 14 is provided between the filter tank 111 and the buffer tank 112, and a circulation pump 15 is provided on the circulation pipeline 14, which can guide the drilling fluid that has entered the buffer tank 112 back to the filter tank 111. (See also...) Figure 2 .

[0074] In some embodiments, the adjustment structure 80 described above may employ, for example... Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 The adjusting structure 80 includes a fixed baffle 81, a sliding baffle 82, a rotating shaft 83, traction ropes 84, and a worm gear adjusting component 85. Two fixed baffles 81 are provided, both vertically arranged and spaced apart. A sliding cavity with an open top is formed between the two fixed baffles 81. The sliding baffle 82 is slidably disposed in the sliding cavity. The rotating shaft 83 is located above the sliding baffle 82 and is rotatably connected to the receiving groove 11. The rotation axis of the rotating shaft 83 is parallel to the rotation axis of the guide roller 40. At least two traction ropes 84 are provided, each spaced apart on the rotating shaft 83. Each traction rope 84 is wound around the rotating shaft 83, with its free end connected to the top of the sliding baffle 82. The worm gear adjusting component 85 is fixed to the outer wall of the receiving groove 11 and connected to the rotating shaft 83.

[0075] The sliding cavity formed between the two fixed baffles 81 allows the sliding baffle 82 to slide and connect. The top position of the sliding baffle 82 can control and adjust the liquid level in the filtration chamber. The lifting and lowering adjustment of the sliding baffle 82 can be achieved by rotating the shaft 83 via the worm gear adjusting component 85. The shaft 83 drives the traction ropes 84. When the shaft 83 rotates and the traction ropes 84 wind around each other, the free ends of the traction ropes 84 pull the sliding baffle 82 upwards; when the shaft 83 rotates and releases the traction ropes 84, the free ends of the traction ropes 84 move downwards. Simultaneously, the sliding baffle 82 moves downwards under its own gravity.

[0076] Furthermore, the method of adjusting the rotating shaft 83 using the worm gear adjusting component 85 is self-locking and does not occupy the space above the receiving groove 11, thus avoiding interference with the wire mesh belt 50 and facilitating space utilization. The worm gear adjusting component 85 can adopt existing technology, and its specific internal structure is well known to those skilled in the art and will not be described in detail here.

[0077] In some embodiments, the filter tank 111 may be as follows: Figure 1 The structure shown. See also Figure 1 Both the filter tank 111 and the buffer tank 112 are equipped with discharge ports 13 at the bottom. The discharge ports 13 can ensure that the residual mud and sand impurities inside are cleaned and discharged after the drilling work is completed.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A drilling fluid screening device for oil drilling engineering, characterized in that, include: The base has a receiving groove on the top, which is used to introduce and hold the drilling fluid to be screened. The rat cage rotating cylinder is rotatably mounted on the base, and its axis is horizontal. A drive structure, mounted on the base, is used to drive the rotating drum of the mouse cage to rotate; Two guide rollers are provided, each of which is arranged parallel to and spaced apart from the rotating drum of the squirrel cage, and is rotatably mounted on the base; The wire mesh belt is wound in a ring around the outer periphery of the squirrel cage drum and each of the guide rollers, and forms an extended end that extends to the outside of the receiving groove; the wire mesh belt forms a filter section at the lower half of the squirrel cage drum to filter the drilling fluid entering the squirrel cage drum; the wire mesh belt removes impurities attached to the outer surface as the squirrel cage drum rotates. The suction assembly has a suction end that extends into the rat cage rotating drum, and the suction assembly is used to extract the filtered drilling fluid from inside the rat cage rotating drum. The axes of the rat cage rotating drum and each of the guide rollers are all located on the same horizontal plane, and the diameter of the guide rollers is smaller than the outer diameter of the rat cage rotating drum. The rat cage rotating cylinder includes: Two rotating uprights are provided, which are arranged in parallel and spaced apart. Each rotating upright is provided with a transition shaft that is rotatably connected to the base. Multiple connecting posts are provided, each of which is horizontally arranged and spaced annularly around the axis of the adapter shaft; each connecting post is connected to two rotating vertical plates at both ends; each connecting post is used for the wire mesh belt to be wound. One of the rotating plates has a through hole through which the suction assembly passes; The driving structure includes: The speed reducer is fixed on the base and is poweredly connected to another of the aforementioned adapter shafts; A driver, connected to the reducer, is used to provide power to the reducer; The suction assembly includes: A horizontal tube, one end of which extends through the through hole into the rotating cylinder of the rat cage; A vertical tube, with its top end connected to the horizontal tube and its bottom end extending downwards, the bottom end of which is the suction end; A water pump is installed on the horizontal pipe; The drilling fluid screening equipment for oil drilling engineering also includes a scraping structure, which is disposed on the receiving tank and close to the guide roller located outside the receiving tank. The scraping structure has a brush portion that extends upward and contacts the wire mesh belt. The drilling fluid screening equipment for oil drilling engineering also includes an adjustment structure, which is disposed in the receiving tank. The adjustment structure divides the receiving tank into a filter tank and a buffer tank for placing the rat cage rotating drum. The adjustment structure is used to adjust the liquid level in the filter tank. The filter tank has an inlet for introducing drilling fluid to be screened. The adjustment structure includes: Two fixed baffles are provided, both of which are vertically arranged and spaced apart; a sliding cavity with an open top is formed between the two fixed baffles. A sliding baffle is slidably disposed within the sliding cavity; A rotating shaft is located above the sliding baffle and is rotatably connected to the receiving groove; the rotation axis of the rotating shaft is parallel to the rotation axis of the guide roller. At least two traction ropes are provided, with each traction rope spaced apart on the rotating shaft; each traction rope is wound around the rotating shaft, and its free end is connected to the top of the sliding baffle. The worm gear adjusting component is fixed to the outer wall of the receiving groove and connected to the rotating shaft.

2. The drilling fluid screening equipment for oil drilling engineering as described in claim 1, characterized in that, Both the filter tank and the buffer tank are equipped with discharge ports at the bottom.

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