Shear cavitation separation integrated device for desorption of waste oil-based drilling mud sludge

Abstract

The application provides a shearing cavitation separation integrated device for desorption of waste oil-based drilling mud sludge, which comprises a static cylinder, an inner part of which is provided with a spacer rotating cylinder and a re-rotator; the rotating cylinder is driven to rotate by a motor; the static cylinder is sequentially provided with a communicating dispersion cavity, a cavitation cavity and a separation cavity; the outer wall of the rotating cylinder is provided with radially arranged scattering rods in the dispersion cavity, which scatters the slurry fluid by rotating; the cavitation cavity is provided with static teeth mounted on the inner wall of the static cylinder and dynamic teeth mounted on the outer wall of the rotating cylinder, the dynamic teeth and the static teeth are gap fitted, and the dynamic teeth rotate to shear the fluid to generate cavitation effect; the separation cavity is used for separating the fluid, so that the heavy phase sludge flows out from the bottom flow outlet of the static cylinder, and the light phase oil and water flow out from the overflow outlet of the static cylinder; the application does not rely on chemical separation reagent, and realizes reduction of environmental pollution, resource recovery and reduction of treatment cost.

Description

Technical Field

[0001] The invention relates to the technical field of harmless treatment of waste drilling mud, in particular to a shear cavitation separation integrated device for oil sludge desorption of waste oil-based drilling mud. Background Art

[0002] During the exploitation of oil fields, a large amount of waste oil-based drilling mud is generated, and the annual production volume often reaches more than 10,000 tons. How to harmlessly treat and recycle the oily sludge in waste oil-based drilling mud is receiving more and more attention from scientific research and the oil exploration and production industry.

[0003] Chinese patent CN115771989A discloses a harmless treatment device for waste oil-based drilling mud and its use method. The waste oil-based drilling mud is filtered through a filter assembly to remove large particles. A water jet is then intermittently rotated to dilute and flush the mud. The mixture of drilling mud and chemicals is then passed through a high-speed rotating centrifuge assembly to separate the solids and liquids in the mud. However, this separation method relies on chemical separation agents, increasing secondary processing costs.

[0004] Chinese patent CN221117278U discloses an oilfield drilling mud processing device. The device directs drilling mud into a dense mesh barrel, where it undergoes a centrifugal and dense mesh separation process, separating the mud and water within the oilfield drilling mud. However, this separation method is prone to clogging the dense mesh, increasing fluid flow resistance and impacting processing capacity.

[0005] Chinese patent CN220999478U discloses an oil removal device for drilling mud treatment. A motor drives an eccentric rotor to move the filter downward, filtering the oil-water mixture in the drilling mud. The mixture is then extracted through a telescopic connecting pipe, enabling drilling mud to be filtered at different heights. However, the device has a complex process flow and high operating and maintenance costs.

[0006] In summary, existing waste oil-based drilling mud oil-containing sludge separation devices have the following problems: First, the separation method relies on chemical separation agents, which increases secondary treatment costs and poses potential environmental hazards. Second, the devices are prone to clogging, which increases fluid flow resistance, affects the device's processing capacity, and reduces work efficiency. Third, the process flow is complex, increasing the device's operating and maintenance costs. Summary of the Invention

[0007] In order to solve the technical problems in the background technology, the present invention discloses an integrated shear cavitation separation device for desorption of waste oil-based drilling mud.

[0008] The present invention provides an integrated shear cavitation separation device for desorption of waste oil-based drilling mud, comprising:

[0009] The fixed static cylinder is arranged horizontally in its axial direction;

[0010] The rotating drum is arranged at one end of the static drum and is driven to rotate by a motor;

[0011] The re-rotator is fixedly arranged at the other end of the static cylinder, coaxially arranged with the rotating cylinder, and spaced apart from the rotating cylinder;

[0012] The static cylinder is provided with a dispersion chamber, a cavitation chamber and a separation chamber which are connected in sequence;

[0013] The outer wall of the drum is provided with radially arranged breaking rods in the dispersion chamber, which break up the mud fluid by rotating;

[0014] The cavitation chamber is provided with a stationary tooth mounted on the inner wall of the stationary cylinder and a moving tooth mounted on the outer wall of the rotating cylinder. The moving and stationary teeth are clearance-matched, and the rotating moving teeth shear the fluid to generate cavitation.

[0015] The separation chamber is used to separate the fluids so that the heavy phase sludge flows out from the bottom flow outlet of the static cylinder and the light phase oil and water flows out from the overflow outlet of the static cylinder;

[0016] The mud fluid enters the dispersion chamber from the inlet of the static cylinder and forms a vortex under the action of the breaking rod; when the fluid enters the separation chamber, under the action of the vortex, the heavy phase sludge flows to the inner wall of the static cylinder and rotates along the wall to flow out of the bottom flow outlet, and the light phase oil and water flows in the opposite direction at the bottom flow outlet through the inner cavity of the re-cyclone and the inner cavity of the rotating cylinder in turn, and flows out from the overflow outlet.

[0017] After the mud fluid enters the dispersion chamber, large pieces of oily sludge will be broken up by the action of the breaking rod, thereby increasing the contact area of ​​the oily sludge and achieving the effect of pre-dispersion; and the mud fluid forms a vortex under the action of the rotation of the drum, which can increase the flow rate and improve the separation effect; when the mud fluid flows into the cavitation chamber, under the action of the relative rotation of the moving teeth and the static teeth, the mud fluid is sheared to produce cavitation, further breaking up large particles of oily sludge, increasing the contact area of ​​the shock waves and microjets generated by the collapse of cavitation bubbles with small particles of oily sludge, releasing the oil droplets wrapped in the sludge particles and the oil droplets attached to the sludge surface, and realizing the separation of sludge and oil and water; when the mud fluid flows into the separation chamber, under the action of the vortex, the heavy phase sludge with high density migrates to the inner wall of the static drum under the action of the vortex and rotates along the wall to flow out of the bottom flow outlet, and the light phase oil and water with low density migrates to the middle into the re-cyclone, and flows into the inner cavity of the drum along the inner cavity of the re-cyclone, and finally flows out from the overflow outlet, thereby realizing the separation of sludge and oil and water.

[0018] The beneficial effects of the above-mentioned arrangement are: 1. It solves the problem that oily sludge in waste oil-based drilling mud is difficult to separate; 2. It does not rely on chemical separation agents, thereby reducing environmental pollution, realizing resource recovery and reducing processing costs; 3. It has a simple structure and low production cost; 4. It operates smoothly without blockage, thereby improving work efficiency; 5. The process flow is simple, and the operation and maintenance costs are low; 6. Since the light-phase oil and water flowing into the inner cavity of the re-cyclone will still be mixed with the middle-phase sludge, the setting of the gap between the rotor and the re-cyclone not only prevents the rotor from being hindered by the re-cyclone during rotation, but also when the light-phase oil and water pass through this gap, the heavy-phase sludge will also flow into the separation chamber from this gap under the action of gravity, thereby further improving the separation effect.

[0019] Since the mud fluid tends to flow toward the motor after entering the dispersion chamber, thus causing equipment failure, a further improvement is made based on this: a protruding partition is provided on the inner wall of the static cylinder to separate the dispersion chamber and the overflow outlet, so that the mud fluid can flow from the dispersion chamber into the cavitation chamber in a directed manner.

[0020] The conventional breaking up bar is cylindrical and extends radially along the drum. It has a small contact area with the mud fluid, low crushing efficiency, and a low flow rate for driving the mud fluid to form a vortex. Based on this, further improvements are made in that one end of the breaking up bar is fixedly connected to the outer wall of the drum, and the other end extends axially toward the drum.

[0021] The specific structure of the overflow outlet is as follows: the partition is located at one end of the dispersion chamber close to the motor, and a bottom plate is provided at one end of the static cylinder close to the motor; the partition, the bottom plate, the inner wall of the static cylinder and the outer wall of the rotating cylinder constitute the overflow chamber; a flow hole is provided in the part of the rotating cylinder located in the overflow chamber; the flow hole connects the overflow chamber and the inner cavity of the rotating cylinder; the overflow outlet is provided on the outer wall of the static cylinder, so that the overflow chamber is connected with the outside of the static cylinder.

[0022] Since the swirling mud fluid moves along the outer wall of the static cylinder, in order to allow the mud fluid to stably enter the separation chamber, the structure of the separation chamber is set as follows: the outer wall of the re-swirler and the inner wall of the static cylinder constitute the separation chamber.

[0023] Because there's a gap between the rotor and the re-rotator, some of the slurry flowing out of the cavitation chamber directly enters the re-rotator cavity, affecting separation efficiency and quality. To address this issue, a further improvement is a bell-shaped structure at the end of the rotor near the re-rotator. This structure guides the slurry from the cavitation chamber outlet into the separation chamber, preventing it from directly entering the re-rotator cavity.

[0024] The heavy sludge contained in the light-phase oil and water entering the re-cyclone cavity is difficult to separate from the light-phase oil and water, and thus difficult to flow into the separation chamber through the gap between the drum and the re-cyclone. Based on this, a further improvement is to install a spiral guide plate at one end of the re-cyclone cavity near the underflow outlet. The guide plate is set up, and the light-phase oil and water containing a small amount of sludge is swirled and guided by the spiral guide plate. The residual heavy-phase sludge migrates to the inner wall of the re-cyclone and re-enters the separation chamber through the reserved gap, achieving re-separation and improving separation efficiency. The light-phase oil and water flows out through the overflow outlet, completing the sludge and oil-water separation function.

[0025] The structural setting of the inlet directly affects the flow rate of the mud fluid in the dispersion chamber. Based on this, further improvements are: the static cylinder is located in the dispersion chamber and is connected to a volute-shaped input pipe, one end of which is connected to the dispersion chamber and the other end is the inlet; the flow direction of the mud fluid at the connection between the input pipe and the static cylinder is the same as the rotation direction of the rotating cylinder.

[0026] The beneficial effects of the present invention are: 1. It solves the problem that oily sludge in waste oil-based drilling mud is difficult to separate; 2. It does not rely on chemical separation agents, thereby reducing environmental pollution, realizing resource recovery and reducing processing costs; 3. It has a simple structure and low production cost; 4. It runs smoothly and will not be blocked, thereby improving work efficiency; 5. The process flow is simple, and the operation and maintenance costs are low; 6. Since the light-phase oil and water flowing into the inner cavity of the re-rotator will still be mixed with the middle-phase sludge, the setting of the gap between the rotor and the re-rotator not only prevents the rotor from being hindered by the re-rotator when rotating, but also when the light-phase oil and water pass through this gap, the heavy-phase sludge will also flow into the separation chamber from this gap under the action of gravity, further improving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples.

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 is a top view of the present invention;

[0030] Figure 3 yes Figure 2 Cross-sectional view of AA;

[0031] Figure 4 yes Figure 2 Cross-sectional view of the middle BB;

[0032] In the figure: 1. Static cylinder; 2. Rotating cylinder; 3. Motor; 4. Re-rotator; 5. Dispersion chamber; 6. Cavitation chamber; 7. Separation chamber; 8. Breaking rod; 9. Static teeth; 10. Moving teeth; 11. Bottom flow outlet; 12. Overflow outlet; 13. Inlet; 14. Bottom plate; 15. Overflow chamber; 16. Flow hole; 17. Guide plate; 18. Inlet pipe; 19. Partition; 101. Left cylinder; 102. Middle cylinder; 103. Right cylinder. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0034] like Figure 1 and Figure 2 As shown, the present invention discloses a shear cavitation separation integrated device for desorption of waste oil-based drilling mud, comprising a fixed static cylinder 1, the axial direction of which is horizontally arranged. Figure 3 As shown in the front view, the static cylinder 1 comprises, from left to right, an integrally formed, coaxially arranged left cylinder 101, a middle cylinder 102, and a right cylinder 103. Both the left cylinder 101 and the right cylinder 103 are cylindrical, while the middle cylinder 102 is frustum-shaped, with its flared end connected to the left cylinder 101 and its constricted end connected to the right cylinder 103.

[0035] The static cylinder 1 is provided with a dispersion chamber 5, a cavitation chamber 6 and a separation chamber 7 which are connected in sequence.

[0036] A base plate 14 is provided at the left end of the stationary cylinder 1. The rotating cylinder 2 is coaxially inserted into the stationary cylinder 1 from the left end of the stationary cylinder 1. Its inner end is retracted into and located near the left cylinder 101. The outer end of the rotating cylinder 2 is located outside the left side of the stationary cylinder 1. The connection between the rotating cylinder 2 and the base plate 14 is achieved through a bearing for rotation and a mechanical seal for sealing.

[0037] The driving end of the motor 3 is connected to the left end of the drum 2 through a coupling, thereby driving the drum 2 to rotate.

[0038] The middle position of the left cylinder 101 is radially connected to a volute-shaped input pipe 18, as shown in FIG. Figure 4 As shown, one end of the inlet pipe 18 is connected to the stationary drum 1, and the other end is provided as an inlet 13 for the input of slurry fluid. A protruding partition 19 is installed inside the stationary drum 1, and the partition 19 is sealed to the rotating drum 2 via a sealing ring. Thus, the bottom plate 14, partition 19, the inner wall of the stationary drum 1, and the outer wall of the rotating drum 2 form a closed overflow chamber 15. An overflow outlet 12 is provided at the upper end of the stationary drum 1 located in the overflow chamber 15, connecting to the outside. The side arms of the rotating drum 2 located in the overflow chamber 15 are provided with multiple evenly distributed flow holes 16, connecting the overflow chamber 15 with the inner cavity of the rotating drum 2.

[0039] The area between the static cylinder 1 and the inlet pipe 18 axially forms a dispersion chamber 5. The outer wall of the dispersion chamber 5 is the inner wall of the static cylinder 1, the inner wall is the outer wall of the rotating cylinder 2, and the left side wall is a partition 19. Multiple breaking rods 8 are radially arranged on the outer wall of the rotating cylinder 2 located within the dispersion chamber 5. One end of the breaking rod 8 is fixedly connected to the outer wall of the rotating cylinder 2, and the other end extends axially toward the rotating cylinder 2. When the rotating cylinder 2 rotates, the breaking rods 8 drive the mud fluid to form a vortex and break up large pieces of oily sludge. In addition, to ensure that the mud fluid can form a stable vortex, the flow direction of the mud fluid at the connection between the inlet pipe 18 and the static cylinder 1 is the same as the rotation direction of the rotating cylinder 2.

[0040] After the slurry enters the dispersion chamber 5, the large pieces of oily sludge will be broken up by the breaking rod 8, thereby increasing the contact area of ​​the oily sludge and achieving the effect of pre-dispersion; and the slurry forms a vortex under the action of the rotation of the drum 2, which can increase the flow rate and improve the separation effect;

[0041] In this embodiment, the breaking rod 8 is Y-shaped. In other embodiments, the breaking rod 8 may also be T-shaped or L-shaped. It is also within the scope of protection of this application that the other end of the breaking rod 8 does not extend axially toward the drum 2, as long as it can break up large pieces of oily sludge and drive the mud fluid to form a vortex. For example, the breaking rod 8 may also be X-shaped.

[0042] In this embodiment, the breaking rods 8 are evenly distributed. In other embodiments, they can be arranged symmetrically, in a gradient arrangement, or in a spiral arrangement.

[0043] The right side of the inlet tube 18, the inner wall of the middle tube 102, and the outer wall of the rotating tube 2 form a cavitation chamber 6. The inner wall of the stationary tube 1 in the area of ​​the cavitation chamber 6 is provided with a plurality of protruding stationary teeth 9, and the outer wall of the rotating tube 2 in the area of ​​the cavitation chamber 6 is provided with a plurality of protruding dynamic teeth 10. The static teeth 9 are spaced apart, and the dynamic teeth 10 are spaced apart, with gaps between the static teeth 9 and the dynamic teeth 10. The tooth shape of the dynamic teeth 10 and the static teeth 9 can be, but is not limited to, rectangular teeth. It can also be cylindrical teeth, sector-shaped teeth with equal central angles, and trapezoidal teeth. The ratio of the circumferential thickness to the tooth height of the dynamic teeth 10 and the static teeth 9 is 0.5 to 1.5, the axial spacing is 0.25 to 2 times the axial thickness, the aspect ratio ranges from 5 to 8, and the ratio of the circumferential thickness to the tooth height is 0.5 to 1.5.

[0044] In this embodiment, the movable teeth 10 and the stationary teeth 9 are staggered, but in other embodiments they may be arranged relative to each other.

[0045] When the movable teeth 10 make circular motion relative to the stationary teeth 9, they shear the slurry fluid to generate cavitation, further breaking up large particles of oily sludge, increasing the contact area between the shock waves and microjets generated by the collapse of cavitation bubbles and the small particles of oily sludge, releasing the oil droplets wrapped in the sludge particles and the oil droplets attached to the sludge surface, and achieving the separation of sludge and oil-water;

[0046] The flared end of the re-cyclone 4 is fixedly connected to the inner wall of the middle cylinder 102 via four rotationally symmetrical fixing rods. A separation chamber 7 is formed between the re-cyclone 4 and the inner wall of the middle cylinder 102. When the mud fluid flows into the separation chamber 7, under the action of the cyclone, the heavy phase sludge with high density migrates to the inner wall of the static cylinder 1 and rotates along the wall to flow out of the bottom flow outlet 11, while the light phase oil and water with low density migrates to the middle and enters the interior of the re-cyclone 4. It flows along the inner cavity of the re-cyclone 4 into the inner cavity of the rotating cylinder 2 and finally flows out from the overflow outlet 12, thereby achieving the separation of sludge and oil and water.

[0047] A spiral guide plate 17 is installed at one end of the recyclone 4's inner chamber, near the underflow outlet 11. This allows the light phase oil-water containing a small amount of sludge to swirl and flow through the spiral guide plate 17. The remaining heavy phase sludge migrates to the inner wall of the recyclone 4 and re-enters the separation chamber 7 through the reserved gap, achieving re-separation and improving separation efficiency. The light phase oil-water flows out through the overflow outlet 12, completing the sludge and oil-water separation function.

[0048] The end of the drum 2 near the re-rotator 4 is in a bell-mouth structure. This configuration guides the mud fluid at the outlet of the cavitation chamber 6 into the separation chamber 7, thereby preventing the mud fluid flowing out of the cavitation chamber 6 from directly entering the inner cavity of the re-rotator 4.

[0049] After the mud fluid enters the dispersion chamber 5, the large pieces of oily sludge will be broken up by the breaking rod 8, thereby increasing the contact area of ​​the oily sludge and achieving the effect of pre-dispersion; and the mud fluid forms a vortex under the action of the rotation of the drum 2, which can increase the flow rate and improve the separation effect; after the mud fluid enters the cavitation chamber 6, the relative rotation of the moving teeth 10 and the static teeth 9 shears the mud fluid to produce cavitation, further breaking up the large particles of oily sludge, increasing the shock wave and micro jet generated by the collapse of the cavitation bubble and the separation effect. The contact area of ​​small particles of oily sludge releases the oil droplets wrapped in the sludge particles and the oil droplets attached to the surface of the sludge, thereby realizing the separation of sludge and oil and water; when the mud fluid flows into the separation chamber 7, under the action of the cyclone, the heavy phase sludge with high density migrates to the inner wall of the static cylinder 1 and rotates along the wall to flow out of the bottom flow outlet 11, and the light phase oil and water with low density migrates to the middle and enters the interior of the re-cyclone 4, and flows into the inner cavity of the rotating cylinder 2 along the inner cavity of the re-cyclone 4, and finally flows out from the overflow outlet 12, thereby realizing the separation of sludge and oil and water.

[0050] Compared with the prior art, the beneficial effects of this embodiment are: 1. It solves the problem that oily sludge in waste oil-based drilling mud is difficult to separate; 2. It does not rely on chemical separation agents, thereby reducing environmental pollution, realizing resource recovery and reducing processing costs; 3. It has a simple structure and low production cost; 4. It runs smoothly and will not be blocked, thereby improving work efficiency; 5. The process flow is simple, and the operation and maintenance costs are low; 6. Since the light phase oil and water flowing into the inner cavity of the re-cyclone 4 will still be mixed with the middle phase sludge, the setting of the gap between the drum 2 and the re-cyclone 4 not only prevents the drum 2 from being hindered by the re-cyclone 4 when rotating, but also when the light phase oil and water pass through this gap, the heavy phase sludge will also flow from this gap into the separation chamber 7 under the action of gravity, further improving the separation effect.

[0051] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A shear cavitation separation integrated device for desorption of waste oil-based drilling mud, characterized in that: include: The fixed static cylinder (1) is arranged horizontally in its axial direction; The rotating drum (2) is arranged at one end of the static drum (1) and is driven to rotate by the motor (3); The re-rotator (4) is fixedly arranged at the other end of the static cylinder (1), is coaxially arranged with the rotating cylinder (2), and is spaced apart from the rotating cylinder (2); The static cylinder (1) is provided with a dispersion chamber (5), a cavitation chamber (6) and a separation chamber (7) which are connected in sequence; The outer wall of the drum (2) is provided with a radially arranged breaking rod (8) at a position located in the dispersion chamber (5), and the mud fluid is broken up by the rotation of the breaking rod; The cavitation chamber (6) is provided with a stationary tooth (9) mounted on the inner wall of the stationary cylinder (1) and a movable tooth (10) mounted on the outer wall of the rotating cylinder (2). The movable tooth (10) and the stationary tooth (9) are clearance-matched, and the movable tooth (10) rotates and shears the fluid to generate cavitation. The separation chamber (7) is used to separate fluids, so that heavy phase sludge flows out from the bottom flow outlet (11) of the static cylinder (1), and light phase oil and water flows out from the overflow outlet (12) of the static cylinder (1); The slurry fluid enters the dispersion chamber (5) from the inlet (13) of the static cylinder (1) and forms a vortex under the action of the breaking rod (8); when the fluid enters the separation chamber (7), under the action of the vortex, the heavy phase sludge flows toward the inner wall of the static cylinder (1) and rotates along the wall to flow out of the bottom flow outlet (11), and the light phase oil and water flows in the opposite direction at the bottom flow outlet (11) through the inner cavity of the re-cyclone (4) and the inner cavity of the rotating cylinder (2) in turn, and flows out from the overflow outlet (12).

2. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 1, characterized in that: The inner wall of the static cylinder (1) is provided with a protruding partition (19) to separate the dispersion chamber (5) and the overflow outlet (12), so that the mud fluid flows from the dispersion chamber (5) into the cavitation chamber (6) in a directionally controlled manner.

3. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 1, characterized in that: One end of the breaking rod (8) is fixedly connected to the outer wall of the rotating drum (2), and the other end extends axially toward the rotating drum (2).

4. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 2, characterized in that: The partition (19) is located at one end of the dispersion chamber (5) close to the motor (3), and a bottom plate (14) is provided at one end of the static cylinder (1) close to the motor (3); The partition plate (19), the bottom plate (14), the inner wall of the static cylinder (1) and the outer wall of the rotating cylinder (2) form an overflow chamber (15); The portion of the rotating drum (2) located in the overflow chamber (15) is provided with a circulation hole (16); the circulation hole (16) communicates with the overflow chamber (15) and the inner cavity of the rotating drum (2); The overflow outlet (12) is arranged on the outer wall of the static cylinder (1), so that the overflow cavity (15) is in communication with the outside of the static cylinder (1).

5. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 2, characterized in that: The outer wall of the re-rotator (4) and the inner wall of the static cylinder (1) form a separation chamber (7).

6. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 5, characterized in that: The end of the rotating drum (2) close to the re-rotator (4) is in a bell-mouth structure.

7. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 6, characterized in that: A spiral guide plate (17) is provided at one end of the inner cavity of the re-swirler (4) close to the bottom flow outlet (11).

8. The integrated shear cavitation separation device for desorption of waste oil-based drilling mud according to claim 1, characterized in that: The static cylinder (1) is located at the dispersion chamber (5) and is connected to a volute-shaped input pipe (18), one end of which is connected to the dispersion chamber (5) and the other end of which is the inlet (13); The flow direction of the mud fluid at the connection between the input pipe (18) and the static drum (1) is the same as the rotation direction of the rotating drum (2).

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