Shearing, cavitation and separation integrated device for desorption of waste oil-based drilling mud oil sludge

Abstract

The invention provides a shearing, cavitation and separation integrated device for desorption of waste oil-based drilling mud oil sludge, which comprises a static cylinder in which a rotating cylinder and a rerotator are arranged at an interval; the drum is driven by a motor to rotate; a dispersion cavity, a cavitation cavity and a separation cavity which are communicated with one another are sequentially formed in the static cylinder; a radially arranged scattering rod is arranged at the part, located in the dispersing cavity, of the outer wall of the rotary drum, and the slurry fluid is scattered through rotation of the scattering rod; static teeth mounted on the inner wall of the static cylinder and movable teeth mounted on the outer wall of the rotating cylinder are arranged in the cavitation cavity, the movable teeth and the static teeth are in clearance fit, and the movable teeth rotate to shear fluid to generate a cavitation effect; the separation cavity is used for separating fluid, so that heavy-phase sludge flows out from an underflow outlet of the static cylinder, and light-phase oil water flows out from an overflow outlet of the static cylinder; the method does not depend on chemical separation agents, environmental pollution is reduced, resource recovery is achieved, and the treatment cost is reduced.

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] A large amount of waste oil-based drilling mud is generated during the exploitation of oil fields, and its annual production often reaches more than 10,000 tons. How to harmlessly treat and recycle the oil-containing sludge in the waste oil-based drilling mud has received 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 out of large particles by a filter assembly, and a water spray pipe is used to dilute and flush the waste oil-based drilling mud and pass the high-speed rotating centrifugal assembly to separate the solid and liquid in the drilling mud. However, this separation method relies on chemical separation agents, which increases the cost of secondary treatment.

[0004] Chinese patent CN221117278U discloses an oilfield drilling mud processing device, in which the oilfield drilling mud is introduced into a dense mesh barrel, and is separated and processed by a centrifugal cylinder and a dense mesh cylinder, thereby separating the mud and water in the oilfield drilling mud. However, the separation method of the device is prone to block the dense mesh, increase the fluid flow resistance, and affect the processing capacity.

[0005] Chinese patent CN220999478U discloses an oil removal device for drilling mud treatment, in which a motor drives an eccentric wheel to move the filter downward to filter the oil-water mixture in the drilling mud, and the oil-water mixture is extracted through a telescopic connecting pipe to filter the drilling mud at different heights. However, the process flow of the device is complicated and the operation and maintenance costs are high.

[0006] In summary, the existing waste oil-based drilling mud oil-containing sludge separation device has the following problems: First, the separation method relies on chemical separation agents, which increases the secondary treatment cost and causes potential harm to the environment. Second, the device is prone to clogging, which will increase the fluid flow resistance, affect the processing capacity of the device, and reduce work efficiency. Third, the process flow is complicated, which increases the operation and maintenance costs of the device. 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 dispersing 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 at the position located in the dispersion chamber, and the mud fluid is broken up by the rotation of the breaking rods;

[0014] The cavitation chamber is provided with a stationary tooth installed on the inner wall of the stationary cylinder and a moving tooth installed on the outer wall of the rotating cylinder. The moving tooth and the stationary tooth are matched with each other in clearance. The moving tooth rotates to 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 entrance 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 stationary teeth, the mud fluid is sheared to produce cavitation, further breaking up large particles of oily sludge, increasing the contact area between the shock wave and microjet generated by the collapse of the cavitation bubble and the small particles of oily sludge, releasing the oil droplets wrapped in the sludge particles and the oil droplets attached to the surface of the sludge, 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 stationary drum 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 inside of 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 manufacturing cost; 4. It runs 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 drum and the re-cyclone not only ensures that the rotation of the drum will not be hindered by the re-cyclone, 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 rod is a cylinder extending 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, a further improvement is that one end of the breaking rod 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: 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 opened 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 arranged 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] Since there is a gap between the drum and the re-rotator, part of the mud fluid will directly enter the inner cavity of the re-rotator when it flows out of the cavitation cavity, thereby affecting the separation effect and quality. Based on this, a further improvement is that the end of the drum close to the re-rotator is a bell-mouth structure. In this way, the bell-mouth structure guides the mud fluid at the outlet of the cavitation cavity and guides it into the separation cavity, thereby preventing the mud fluid flowing out of the cavitation cavity from directly entering the inner cavity of the re-rotator.

[0024] The heavy phase sludge contained in the light phase oil and water entering the inner cavity of the re-cyclone is difficult to separate from the light phase oil and water, and it is also difficult to flow into the separation chamber from the gap between the drum and the re-cyclone. Based on this, a further improvement is that a spiral guide plate is provided at one end of the inner cavity of the re-cyclone near the bottom flow outlet. With the setting of the guide plate, the light phase oil and water containing a small amount of sludge is swirled and guided by the spiral guide plate, and the residual heavy phase sludge migrates to the inner wall of the re-cyclone and re-enters the separation chamber through the reserved gap to achieve re-separation and improve separation efficiency; the light phase oil and water flows out from the overflow outlet to achieve 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 manufacturing cost; 4. It runs smoothly without blockage, thereby improving work efficiency; 5. It has a simple process flow and low operating and maintenance costs; 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 drum and the re-cyclone not only ensures that the rotation of the drum will not be hindered by the re-cyclone, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

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

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

[0030] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[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, input 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. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[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 a front view, the static cylinder 1 includes, from left to right, a left cylinder 101, a middle cylinder 102, and a right cylinder 103, which are integrally formed and coaxially arranged. The left cylinder 101 and the right cylinder 103 are both cylindrical, and the middle cylinder 102 is truncated cone-shaped, with its expanded end connected to the left cylinder 101 and its contracted end connected to the right cylinder 103.

[0035] A dispersing chamber 5 , a cavitation chamber 6 and a separation chamber 7 which are connected to each other are sequentially arranged in the static cylinder 1 .

[0036] The left end of the static cylinder 1 is provided with a bottom plate 14, the rotating cylinder 2 is coaxially inserted into the static cylinder 1 from the left end of the static cylinder 1, the inner end of the rotating cylinder 2 is retracted into the left cylinder 101 and is located near the left cylinder 101, and the outer end of the rotating cylinder 2 is located outside the left side of the static cylinder 1. The connection between the rotating cylinder 2 and the bottom plate 14 is rotatably connected by a bearing, and is sealed by a mechanical seal.

[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 part of the left cylinder 101 is radially connected to a volute-shaped input pipe 18. Figure 4 As shown, one end of the input pipe 18 is connected to the static cylinder 1, and the other end is set as an inlet 13 for inputting mud fluid. A protruding partition 19 is set in the static cylinder 1, and the partition 19 is sealed with the rotating cylinder 2 through a sealing ring, so that the bottom plate 14, the partition 19, the inner wall of the static cylinder 1 and the outer wall of the rotating cylinder 2 form a closed overflow chamber 15. An overflow outlet 12 connected to the outside is set at the upper end of the static cylinder 1 located in the overflow chamber 15, and a plurality of evenly distributed flow holes 16 are opened on the side arm of the rotating cylinder 2 located in the overflow chamber 15, so that the overflow chamber 15 is connected to the inner cavity of the rotating cylinder 2.

[0039] The area between the two axial sides of the static cylinder 1 and the input pipe 18 constitutes 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 wall is a partition 19. The outer wall of the rotating cylinder 2 located in the dispersion chamber 5 is radially provided with a plurality of breaking rods 8, 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 rod 8 drives the mud fluid to form a vortex and breaks up large pieces of oily sludge. In addition, in order to realize that the mud fluid can form a stable vortex, the flow direction of the mud fluid at the connection between the input pipe 18 and the static cylinder 1 is the same as the rotation direction of the rotating cylinder 2.

[0040] After the mud fluid enters the dispersion chamber 5, the large pieces of oily sludge will be broken 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;

[0041] In this embodiment, the breaking rod 8 is Y-shaped, and in other embodiments, the breaking rod 8 may also be T-shaped or L-shaped. It is also within the protection scope of the present 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 arranged. In other embodiments, they can also be arranged symmetrically, in a gradient arrangement, or in a spiral arrangement.

[0043] The right side of the input tube 18, the inner wall of the middle tube 102 and the outer wall of the rotating drum 2 form a cavitation chamber 6. The inner wall of the stationary drum 1 located in the cavitation chamber 6 area is provided with a plurality of protruding stationary teeth 9, and the outer wall of the rotating drum 2 located in the cavitation chamber 6 area is provided with a plurality of protruding moving teeth 10. The stationary teeth 9 are arranged at intervals, the moving teeth 10 are arranged at intervals, and there is a gap between the stationary teeth 9 and the moving teeth 10. The tooth shape of the moving teeth 10 and the stationary teeth 9 can be, but not limited to, rectangular teeth, and can also be cylindrical teeth, fan-shaped teeth with equal central angles, and trapezoidal teeth. The ratio of the circumferential thickness to the tooth height of the moving teeth 10 and the stationary 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 relatively.

[0045] When the moving teeth 10 make circular motion relative to the stationary teeth 9, the slurry fluid is sheared to generate cavitation, which further breaks up large particles of oily sludge, increases the contact area between the shock wave and micro jet generated by the collapse of cavitation bubbles and the small particles of oily sludge, releases the oil droplets wrapped inside the sludge particles and the oil droplets attached to the sludge surface, and realizes 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 through 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 surface 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 inside 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.

[0047] A spiral guide plate 17 is provided at one end of the inner cavity of the re-cyclone 4 near the bottom flow outlet 11. With the arrangement of the guide plate 17, the light phase oil-water containing a small amount of sludge is swirled and guided by the spiral guide plate 17, and the residual heavy phase sludge migrates to the inner wall of the re-cyclone 4 and re-enters the separation chamber 7 through the reserved gap to achieve re-separation and improve the separation efficiency; the light phase oil-water flows out from the overflow outlet 12, achieving 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. In this way, the bell-mouth structure guides the mud fluid at the outlet of the cavitation chamber 6 to 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 under the action of 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 mud fluid is sheared and cavitation is generated under the action of the relative rotation of the moving teeth 10 and the stationary teeth 9, 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 contact area of ​​small particles of oily sludge releases the oil droplets wrapped in the sludge particles and the oil droplets attached to the sludge surface, 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 inside 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 manufacturing cost; 4. It runs 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 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 ensures that the drum 2 will not be 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 into the separation chamber 7 from this gap under the action of gravity, thereby further improving the separation effect.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope 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 stationary drum (1) and is driven to rotate by a 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 moving tooth (10) mounted on the outer wall of the rotating cylinder (2); the moving tooth (10) and the stationary tooth (9) are clearance-matched, and the moving 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 mud 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 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 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 directional 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 plate (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 stationary cylinder (1) and the outer wall of the rotating cylinder (2) form an overflow chamber (15); A flow hole (16) is provided in the portion of the rotating drum (2) located in the overflow chamber (15); the flow 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 chamber (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-cyclone (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 stationary cylinder (1) is located at the dispersion chamber (5) and is connected to a volute-shaped input pipe (18), one end of which is in communication with 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 cylinder (1) is the same as the rotation direction of the rotating cylinder (2).

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