Multi-working-condition adaptive drilling fluid tank-type purification device

Abstract

The present application relates to a kind of multi-working condition adaptation drilling fluid tank type purification device, and it is related to the technical field of drilling fluid processing;Including support frame, support frame is provided with purification tank, purification tank is inclined on support frame, rotatingly installed with purification cylinder in purification tank, the end of the higher purification tank is installed with the liquid inlet pipe that is communicated with the interior of purification cylinder, purification cylinder includes primary separation cylinder and secondary separation cylinder, cleaning mechanism for preventing adhesion and plugging screen hole is further provided in purification tank to primary separation cylinder and secondary separation cylinder for cleaning.This application can solve the following problems existing in the process of drilling fluid processing in prior art: by setting the inclined purification tank, auxiliary discharge by gravity, cooperate with the continuous rotation of purification cylinder, make the solid phase after screening automatically discharge to low end, avoid accumulation;And the way of high pressure nozzle and spiral scraper is combined, high frequency flushing and scraping are carried out to screen hole and cylinder wall, effectively prevent viscous material from plugging, ensure long-term operation.

Description

Technical Field

[0001] This invention relates to the technical field of drilling fluid treatment, and in particular to a multi-condition adaptable drilling fluid tank purification device. Background Technology

[0002] In various drilling projects such as oil and gas exploration and development, drilling fluid is recognized as the lifeblood of drilling operations. Its performance and stability directly determine drilling efficiency, construction safety and overall economy. During the circulation process, drilling fluid continuously carries a large amount of solid impurities such as rock cuttings, sand, barite particles and formation clay that are returned from the bottom of the well.

[0003] If these solid impurities are not purified in a timely and effective manner, they will continue to accumulate in the drilling fluid. This will not only cause abnormalities in key performance indicators such as rheology and filtration of the drilling fluid, weakening its core functions such as carrying cuttings, lubricating drill tools, balancing formation pressure, and cooling drill bits, but will also exacerbate the wear and failure of circulation system equipment such as pumps, manifolds, and drill bit nozzles, significantly increasing maintenance costs.

[0004] For example, Chinese Patent CN120361612A discloses a continuous purification and treatment device for drilling fluid waste, including a drill cuttings screening mechanism with a first solid material outlet, a second solid material outlet, and a liquid outlet. The inlet end of the drill cuttings discharge component is connected to the first solid material outlet, the inlet end of the extrusion dewatering mechanism is connected to the second solid material outlet, and the inlet end of the multi-stage drawer-type purification mechanism is connected to the liquid outlet. An adjustable material feeding mechanism is provided at the inlet end of the drill cuttings screening mechanism. This device effectively reduces equipment investment costs, improves the convenience of transportation, transfer, installation, and maintenance, and can remove solids and harmful substances from the waste fluid stage by stage, making the entire purification process continuous, improving purification efficiency, and rendering solids and harmful substances harmless according to needs, thus avoiding environmental pollution.

[0005] However, the aforementioned continuous purification and treatment device for drilling fluid waste has some shortcomings in actual use: 1. High-viscosity drilling fluid contains a large amount of polymers, colloids and fine solid phases. It has poor fluidity and strong adhesion and film-forming properties. When sieving, it is easy to form a dense liquid film on the screen hole and screen surface, causing wet sticking of the screen. Traditional knocking and vibration to clean the blockage can only remove loose dry material and is difficult to destroy the adhesion interface between viscous material and screen. The cleaning effect is poor and it is easy to damage the screen and cause fatigue failure.

[0006] 2. In the processing of oil-based drilling fluids or high-oil-content drill cuttings, if the temperature decreases or the oil oxidizes, viscous gel-like or waxy deposits may form. These substances have a strong affinity for metal surfaces and may be difficult to remove completely by mechanical scraping and vibration alone. Furthermore, in the aforementioned devices, the feed head and the side of the screening baffle cannot always maintain contact. Once the baffle adheres, the spiral pushing force of the screening baffle on the drill cuttings will weaken. The drill cuttings may not be efficiently conveyed to the discharge port, leading to material accumulation on the screen surface, thereby reducing screening efficiency and throughput.

[0007] Therefore, based on the above-mentioned viewpoints, it is of great significance to improve and perfect the drilling fluid waste purification and treatment device. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a multi-condition adaptable drilling fluid tank-type purification device, comprising a support frame, a purification tank mounted on the support frame, the purification tank being inclined on the support frame, a purification cylinder being rotatably installed inside the purification tank, and an inlet pipe connected to the inside of the purification cylinder being installed at the higher end of the purification tank. Waste drilling fluid generated during drilling will enter the purification cylinder through the inlet pipe for multi-stage purification and screening.

[0009] The purification tank includes a primary separation tank and a secondary separation tank. The purification tank is also equipped with a cleaning mechanism to clean the primary and secondary separation tanks and prevent them from sticking and clogging the screening holes.

[0010] Preferably, the secondary separation cylinder is rotatably installed inside the purification tank, and the primary separation cylinder is installed inside the secondary separation cylinder. Both the primary and secondary separation cylinders are provided with screening holes, and the liquid inlet pipe extends into the interior of the primary separation cylinder.

[0011] Preferably, the diameter of the screening holes on the primary separation cylinder is larger than the diameter of the screening holes on the secondary separation cylinder, which enables the screening and removal of solid impurities of different diameters in the drilling fluid.

[0012] Preferably, a mudguard is installed inside the primary separation tank and between the secondary separation tank, and the mudguard is tilted in the same direction as the purification tank.

[0013] Preferably, the liquid inlet pipe is located below the mudguard.

[0014] Preferably, a slag hopper connected to the lower end of the purification tank is installed therein. Multiple baffles are installed inside the slag hopper, which divide the space inside the slag hopper into multiple slag discharge chambers. The slag discharge chambers are connected to the primary separation cylinder and the secondary separation cylinder, respectively.

[0015] Preferably, the unclogging mechanism includes an extension tube, which is positioned above the purification tank along its length and extends into the interior of the purification tank. A cleaning tube is installed inside the extension tube, and multiple nozzles are equidistantly connected to the cleaning tube.

[0016] Preferably, the bottom of the purification tank is equipped with a collection tank that communicates with its interior. The filtered drilling fluid flows naturally into the collection tank for collection. A filter screen is installed at the connection between the collection tank and the purification tank. An overflow hole is opened at one end of the collection tank along its length.

[0017] Preferably, a spiral scraper is connected to the side wall of the secondary separation cylinder, and the spiral scraper can scrape off the filter material on the filter screen during the rotation of the secondary separation cylinder.

[0018] Preferably, the liquid collection tank is equipped with a guide plate installed at an angle.

[0019] In summary, this application includes at least one of the following beneficial technical effects: I. This invention uses an inclined purification tank to assist in discharge by gravity, and with the continuous rotation of the purification cylinder, the solid phase after screening is automatically discharged to the lower end, avoiding accumulation and achieving continuous and stable operation. Furthermore, it uses a combination of high-pressure nozzles and spiral scrapers to perform high-frequency flushing and scraping of the screening holes and cylinder walls, effectively preventing viscous materials from clogging the system and ensuring long-term operation.

[0020] Second, by setting up a mudguard, the present invention can receive the cleaned impurities and automatically discharge them along the inclined surface, while blocking the liquid inlet pipe, so that the liquid inlet channel and the slag discharge channel are arranged in a staggered manner, thus avoiding the contamination of the liquid inlet area by the scraped solid material.

[0021] Third, this invention removes residual fine suspended particles by setting a filter screen at the inlet of the collection tank for secondary interception, and then uses a guide plate to reduce the liquid flow rate to improve sedimentation efficiency. The overflow hole prioritizes the discharge of the supernatant, which significantly reduces the solid content of the collected liquid. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of the purification tank and liquid collection tank of the present invention.

[0025] Figure 3 This is the present invention. Figure 2 A schematic diagram of the structure at point A in the middle.

[0026] Figure 4 This is a schematic diagram showing the position of the mudguard of the present invention.

[0027] Figure 5 This is a schematic diagram of the slag hopper and circular valve of the present invention.

[0028] Figure 6This is a schematic diagram of the structure of the present invention that drives the secondary separation cylinder to rotate.

[0029] In the diagram, 1. Support frame; 10. Purification tank; 11. Inlet pipe; 12. Purification cylinder; 120. Primary separation cylinder; 121. Secondary separation cylinder; 13. Screening hole; 2. Unblocking mechanism; 20. Extension pipe; 21. Cleaning pipe; 22. Nozzle; 30. Collection tank; 31. Filter screen; 32. Overflow hole; 40. Mud baffle; 41. Fixing plate; 50. Slag hopper; 51. Baffle plate; 52. Slag discharge bin; 53. Circular valve; 6. Spiral scraper; 7. Guide plate; 80. Driven gear ring; 81. Drive gear. Detailed Implementation

[0030] The following combination Figures 1-6 The embodiments of the present invention will be described in detail below.

[0031] This application discloses a multi-condition adaptable drilling fluid tank purification device. This invention is mainly applied in the drilling fluid treatment process, effectively avoiding material accumulation and pipeline blockage. Specifically, the synergistic effect of the inclined purification tank and the rotating purification cylinder utilizes gravity-assisted slag discharge, and a blockage-clearing mechanism performs high-pressure flushing of the screening holes, ensuring timely discharge of solid materials during continuous operation without adhesion or blockage. Furthermore, this invention solves the problems of insufficient screening accuracy and incomplete cleaning in traditional equipment. It achieves step-by-step filtration through nested coarse and fine two-stage separation cylinders, combined with mudguard partitioning and secondary sedimentation in the collection tank, significantly improving solid-liquid separation effect and treatment efficiency.

[0032] Reference Figure 1 , Figure 2 and Figure 4 As shown, a multi-condition adaptable drilling fluid tank purification device includes a support frame 1, on which a purification tank 10 is mounted. The purification tank 10 is inclined on the support frame 1, so that a height difference is formed between the high and low ends of the purification tank 10. With the aid of gravity, the material flows. A purification cylinder 12 is rotatably installed inside the purification tank 10. An inlet pipe 11 connected to the inside of the purification cylinder 12 is installed at the higher end of the purification tank 10. Waste drilling fluid generated during drilling will enter the purification cylinder 12 through the inlet pipe 11 for multi-stage purification and screening.

[0033] The purification cylinder 12 is driven to rotate continuously inside the purification tank 10 and dynamically screen the incoming waste drilling fluid. The higher end of the purification tank 10 is equipped with an inlet pipe 11 that communicates with the inside of the purification cylinder 12. The waste drilling fluid generated during the drilling process will directly enter the purification cylinder 12 through the inlet pipe 11 for multi-stage purification and screening.

[0034] The inclined structure of the purification tank 10, combined with the rotation of the purification cylinder 12, allows the screened solid material to be automatically discharged to the lower end of the purification tank 10 under the action of gravity, thereby avoiding material accumulation and realizing continuous operation.

[0035] The purification cylinder 12 includes a primary separation cylinder 120 and a secondary separation cylinder 121. The secondary separation cylinder 121 is rotatably disposed inside the purification tank 10, and the primary separation cylinder 120 is fixedly disposed inside the secondary separation cylinder 121. When the secondary separation cylinder 121 rotates, it will cause the primary separation cylinder 120 to rotate synchronously. The two form a nested structure and divide the internal space into two-stage filtration areas in the radial direction. Screening holes 13 are opened on both the primary separation cylinder 120 and the secondary separation cylinder 121. The liquid inlet pipe 11 extends into the interior of the primary separation cylinder 120, and the waste drilling fluid directly enters the central area of ​​the primary separation cylinder 120 for initial filtration.

[0036] One end of the inlet pipe 11 located inside the purification tank 10 is connected to a fixing plate 41. The fixing plate 41 is rotatably connected to the primary separation cylinder 120, so that the fixing plate 41 and the end of the primary separation cylinder 120 form a relative rotational engagement. During the rotation of the primary separation cylinder 120, the fixing plate 41 remains stationary while the primary separation cylinder 120 rotates around its axis, thereby ensuring the continuous and stable conveying function of the inlet pipe 11. At the same time, the fixing plate 41 blocks the higher side of the primary separation cylinder 120, ensuring that solid materials or drilling fluid will not splash back from the opening at the higher end to the outside of the purification tank 10 or contaminate the installation area of ​​the inlet pipe 11.

[0037] The purification tank 10 is also equipped with a cleaning mechanism 2 to clean the primary separation cylinder 120 and the secondary separation cylinder 121 to prevent them from sticking and clogging the screening holes 13. During the rotation of the purification cylinder 12, it continuously scrapes off the viscous solid material adhering to the edge of the screening holes 13 and the cylinder wall.

[0038] Reference Figure 4 The diagram shows a structural schematic of solid particles being intercepted in stages. Specifically, the diameter of the screening holes 13 on the primary separation cylinder 120 is larger than that on the secondary separation cylinder 121, enabling the screening and removal of solid impurities of different diameters in the drilling fluid. The screening holes 13 of different diameters achieve step-by-step filtration from coarse to fine. The rotating purification cylinder 12 causes the waste drilling fluid to tumble inside the cylinder and pass through the various levels of screens in sequence, causing solid particles to be intercepted in stages, while the liquid phase and fine particles penetrate the screens and fall to the bottom of the purification tank 10 to complete the separation.

[0039] Reference Figure 4The diagram shows a structural schematic for receiving and conveying the cleaned solid particles. Specifically, a mudguard 40 is installed between the primary separation cylinder 120 and the secondary separation cylinder 121. The mudguard 40 consists of a wide plate located inside the primary separation cylinder 120 and two narrow plates between the primary and secondary separation cylinders 120 and 121. The wide and narrow plates are on the same plane, forming a platform for conveying the cleaned impurities. The mudguard 40 is fixedly connected to a fixed plate 41. The primary separation cylinder 120 and the secondary separation cylinder 121... When rotating, the mudguard 40 does not rotate. The mudguard 40 is tilted in the same direction as the purification tank 10. The impurities scraped off by the unblocking mechanism 2 fall directly onto the mudguard 40 under the action of gravity. The mudguard 40 receives the solid impurities after cleaning from the outer wall of the primary separation cylinder 120 and the outer wall of the secondary separation cylinder 121, and separates the impurities from the liquid phase material that has been screened in the purification tank 10, thereby preventing secondary pollution. The tilted mudguard 40 causes the impurities to automatically slide and flow out to the lower end under the action of gravity.

[0040] Reference Figure 2 and Figure 6 The diagram shows the structural layout of the inlet pipe 11. Specifically, the inlet pipe 11 is positioned below the mudguard 40. The mudguard 40 shields the inlet pipe 11, preventing impurities scraped off by the cleaning mechanism 2 and solid materials sliding along the mudguard 40 from falling directly or adhering to the outer wall of the inlet pipe 11. The area above the mudguard 40 is used to receive the cleaned impurities and facilitate directional slag discharge. The area below the mudguard 40 is used to arrange the inlet pipe 11 and provide an independent channel for the entry of waste drilling fluid. The inlet pipe 11 and the mudguard 40 are arranged in a staggered manner to ensure that the inlet process and the slag discharge process do not interfere with each other.

[0041] Reference Figure 5 The diagram shows a structural schematic for the separate collection of different solid particles and cleaned impurities. Specifically, a slag hopper 50 connected to the lower end of the purification tank 10 is installed. Multiple baffles 51 are installed inside the slag hopper 50, which divides the space inside the slag hopper 50 into multiple slag discharge chambers 52. The slag discharge chambers 52 are connected to the primary separation cylinder 120 and the secondary separation cylinder 121, respectively. The baffles 51 are arranged vertically along the inclined direction of the slag hopper 50 so that each slag discharge chamber 52 is independent and does not cross-contaminate with each other. Each slag discharge chamber 52 has an independent discharge port at its bottom so that it can be discharged separately or collected centrally according to the working conditions.

[0042] A circular valve 53 is also installed at the lower end of the purification tank 10. During the impurity separation process, the circular valve 53 is in a closed state to seal the inside of the purification tank 10 and prevent the drilling fluid from flowing out directly. This ensures that the screening operation in the purification tank 10 is carried out stably in a closed environment and avoids the premature discharge of drilling fluid that has not been fully separated.

[0043] During the cleaning process, the circular valve 53 is opened, allowing the solid material to flow towards the slag hopper 50 and be discharged in stages through each slag discharge bin 52, driven by the combined action of gravity flow, high-pressure injection of the unblocking mechanism 2, and pushing action of the spiral scraper 6.

[0044] Reference Figure 2 and Figure 3 The diagram shows a structural schematic for cleaning the primary separation cylinder 120 and the secondary separation cylinder 121. Specifically, the unblocking mechanism 2 includes an extension pipe 20, which is positioned above the purification tank 10 along its length and extends into the tank. The extension pipe 20 is connected to an external water pipe, allowing the external water source to continuously supply cleaning medium to the cleaning pipe 21. The cleaning pipe 21 is installed inside the extension pipe 20, and multiple nozzles 22 are equidistantly connected to the cleaning pipe 21. The nozzles 22 face the outer wall of the secondary separation cylinder 121 and are high-pressure nozzles. The cleaning medium is sprayed in the form of a high-pressure jet onto the cylinder walls and screening holes 13 of the primary and secondary separation cylinders 120 and 121. The high-pressure water curtain sprayed by the high-pressure nozzles 22 directly impacts the viscous solid material blocked in the screening holes 13, thereby dispersing the material and peeling it off the cylinder wall.

[0045] Reference Figure 2 and Figure 3 The diagram shows a structure for further collection and sedimentation of the pre-filtered drilling fluid. Specifically, the bottom of the purification tank 10 is equipped with a collection tank 30 connected to its interior. The filtered drilling fluid flows naturally into the collection tank 30 for collection under gravity, allowing the purified liquid phase material to be centrally stored for subsequent reuse or discharge. A filter screen 31 is installed at the connection between the collection tank 30 and the purification tank 10. The filter screen 31 filters the fluid before it enters the collection tank 30. The drilling fluid undergoes secondary interception to further remove residual fine suspended particles, thereby improving the cleanliness of the collected fluid. An overflow hole 32 is provided at one end of the length direction of the collection tank 30. Heavier solid particles in the drilling fluid settle to the bottom of the collection tank 30 under the action of gravity, while the lighter supernatant accumulates on the upper layer of the collection tank 30. The clean drilling fluid can flow out from the overflow hole 32, realizing the priority discharge of the supernatant, which significantly reduces the solid content of the overflowing drilling fluid, thereby meeting the cleanliness requirements for reuse or external discharge.

[0046] Reference Figure 2The diagram shows the structure for cleaning the purification tank 10 and the filter screen 31. Specifically, a spiral scraper 6 is connected to the side wall of the secondary separation cylinder 121, extending to the upper surface of the filter screen 31. During the rotation of the secondary separation cylinder 121, the spiral scraper 6 scrapes off the filter material on the filter screen 31. As the spiral scraper 6 rotates, its spiral edge continuously sweeps across the surface of the filter screen 31, peeling off the solid filter material trapped on the filter screen 31. While scraping off the filter material, the spiral scraper 6 also cleans it using the nozzle 22. The material then falls into the mudguard area with the water flow, achieving coordinated discharge with the impurities scraped off from the primary separation cylinder 120 and the secondary separation cylinder 121.

[0047] Reference Figure 2 The diagram shows a structure for reducing the turbulence velocity during drilling fluid collection. Specifically, a guide plate 7 is installed at an angle inside the collection tank 30. The guide plate 7 extends downwards from the end of the collection tank 30 near the purification tank 10 to the end away from the purification tank 10, forming a guiding slope inside the collection tank 30. After the drilling fluid flows into the collection tank 30 from the bottom of the purification tank 10, it first falls on the guide plate 7 and then slowly flows downwards along the surface of the guide plate 7, effectively reducing the flow velocity of the drilling fluid, reducing the turbulence of the drilling fluid entering the collection tank 30, and improving the sedimentation efficiency inside the collection tank 30.

[0048] Reference Figure 6 The diagram shows the structure of the secondary separation cylinder 121. Specifically, the secondary separation cylinder 121 is controlled to rotate by a driving component, which includes a driven gear ring 80 installed at one end of the secondary separation cylinder 121, and a driving gear 81 that meshes with the driven gear ring 80 is rotatably installed inside the purification tank 10.

[0049] The drive gear 81 is driven to rotate by a motor installed on the purification tank 10, which in turn drives the driven gear ring 80 to rotate. The meshing transmission method of the drive gear 81 and the driven gear ring 80 is adapted to the inclined spatial structure inside the purification tank 10, and the driving force is evenly transmitted to the secondary separation cylinder 121. The rotation speed of the secondary separation cylinder 121 can be adjusted according to the needs of multiple working conditions, thereby adjusting the rotation speed to meet the treatment requirements of waste drilling fluid with different viscosities and solid phase contents.

[0050] The faster the rotation speed, the more revolutions the primary separation cylinder 120 and the secondary separation cylinder 121 make per unit time. The cleaning frequency of the high-pressure nozzle 22 on each area of ​​the cylinder wall increases accordingly, so that each screening hole 13 is flushed by high-pressure jets multiple times in a shorter time interval, which is more effective for cleaning impurities with greater viscosity.

[0051] During operation: First, the waste drilling fluid enters the central area of ​​the primary separation cylinder 120 through the inlet pipe 11. Then, the purification cylinder 12 rotates. The primary separation cylinder 120 coarsely screens large particles, and the secondary separation cylinder 121 finely screens small particles. The solid phase is intercepted in stages, and the liquid phase and fine particles fall to the bottom of the tank.

[0052] Step 2: When it is necessary to clean the primary separation cylinder 120 and the secondary separation cylinder 121, the unblocking mechanism 2 continuously sprays cleaning medium through the high-pressure nozzle 22 to flush the screening hole 13 and the cylinder wall, peel off viscous materials, scrape off impurities and let them fall to the mud baffle 40, slide along the inclined surface to the bottom and be discharged. The mud baffle 40 also isolates the liquid inlet pipe 11 to avoid interference between liquid inlet and slag discharge.

[0053] Step 3: The bottom of the purification tank 10 is equipped with a slag hopper 50, and the internal partition 51 divides it into multiple slag discharge chambers 52, which are connected to the primary separation cylinder 120 and the secondary separation cylinder 121 respectively to achieve graded slag discharge. The circular valve 53 controls the timing of slag discharge. After opening, the solid phase is concentratedly discharged under gravity, high-pressure injection and the push of the spiral scraper 6.

[0054] Step 4: The bottom of the purification tank 10 is connected to the collection tank 30. After filtration, the drilling fluid flows in. The collection tank 30 is equipped with a filter screen 31 for secondary interception. The guide plate 7 reduces the flow rate and promotes sedimentation. The overflow hole 32 prioritizes the discharge of the supernatant, realizing the clean collection and reuse of the liquid phase.

[0055] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-condition adaptable drilling fluid tank-type purification device, comprising a support frame (1), on which a purification tank (10) is disposed, characterized in that: The purification tank (10) is inclined on the support frame (1). The purification cylinder (12) is rotatably installed inside the purification tank (10). The higher end of the purification tank (10) is equipped with an inlet pipe (11) that communicates with the inside of the purification cylinder (12). The waste drilling fluid generated during the drilling process will enter the purification cylinder (12) through the inlet pipe (11) for multi-stage purification and screening. The purification cylinder (12) includes a primary separation cylinder (120) and a secondary separation cylinder (121). The purification tank (10) is also equipped with a cleaning mechanism (2) to clean the primary separation cylinder (120) and the secondary separation cylinder (121) to prevent them from sticking and clogging the screening holes (13).

2. The multi-condition adaptable drilling fluid tank purification device according to claim 1, characterized in that: The secondary separation cylinder (121) is rotatably installed inside the purification tank (10), and the primary separation cylinder (120) is installed inside the secondary separation cylinder (121). Both the primary separation cylinder (120) and the secondary separation cylinder (121) are provided with screening holes (13), and the liquid inlet pipe (11) extends into the interior of the primary separation cylinder (120).

3. The multi-condition adaptable drilling fluid tank purification device according to claim 2, characterized in that: The diameter of the screening holes (13) on the primary separation cylinder (120) is larger than the diameter of the screening holes (13) on the secondary separation cylinder (121), which can screen and remove solid impurities of different diameters in the drilling fluid.

4. The multi-condition adaptable drilling fluid tank purification device according to claim 1, characterized in that: A mudguard (40) is installed between the interior of the primary separation cylinder (120) and the secondary separation cylinder (121), and the mudguard (40) is inclined in the same direction as the purification tank (10).

5. A multi-condition adaptable drilling fluid tank purification device according to claim 4, characterized in that: The liquid inlet pipe (11) is located below the mudguard (40).

6. The multi-condition adaptable drilling fluid tank purification device according to claim 1, characterized in that: The lower end of the purification tank (10) is equipped with a slag hopper (50) that communicates with its interior. Multiple partitions (51) are installed inside the slag hopper (50). The partitions (51) divide the space inside the slag hopper (50) into multiple slag discharge chambers (52). The slag discharge chambers (52) are respectively connected to the primary separation cylinder (120) and the secondary separation cylinder (121).

7. The multi-condition adaptable drilling fluid tank purification device according to claim 1, characterized in that: The unblocking mechanism (2) includes an extension tube (20), which is located above the purification tank (10) along the length of the purification tank (10) and extends into the purification tank (10). A cleaning tube (21) is installed inside the extension tube (20), and multiple nozzles (22) are connected at equal intervals on the cleaning tube (21).

8. The multi-condition adaptable drilling fluid tank purification device according to claim 1, characterized in that: The bottom of the purification tank (10) is provided with a liquid collection tank (30) that communicates with its interior. The filtered drilling fluid flows naturally into the liquid collection tank (30) for collection. A filter screen (31) is installed at the connection between the liquid collection tank (30) and the purification tank (10). An overflow hole (32) is opened at one end of the liquid collection tank (30) in the length direction.

9. A multi-condition adaptable drilling fluid tank purification device according to claim 8, characterized in that: A spiral scraper (6) is connected to the side wall of the secondary separation cylinder (121). During the rotation of the secondary separation cylinder (121), the spiral scraper (6) can scrape off the filter material on the filter screen (31).

10. A multi-condition adaptable drilling fluid tank purification device according to claim 8, characterized in that: The liquid collection tank (30) is equipped with a guide plate (7) installed at an angle.

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