Automatic sand cleaning device for drilling fluid circulation tank

Abstract

The utility model discloses an automatic sand cleaning device for a drilling fluid circulation tank, which comprises a circulation tank and a sand cleaning component, a tank bin for accommodating mixed liquid is arranged in the circulation tank, a sand settling tank communicated with the tank bin and used for solid deposition in the mixed liquid is arranged at the bottom of the circulation tank, and a pusher is arranged in the sand settling tank. The pushing device is used for pushing the deposited solid to one end of the circulating tank; the sand cleaning assembly comprises a first conveying pipe communicating with the sand settling tank, a first sand pump connected to the first conveying pipe and used for conveying the mixed liquid, and a sand remover communicating with the first conveying pipe and used for separating solids in the mixed liquid, and an overflow pipe communicating with the tank bin is arranged at the top of the sand remover. And solids in the mixed liquid can be cleaned and screened in time, so that rock debris precipitation of the drilling fluid circulation tank in the slurry circulation treatment process is prevented and solved, and the potential safety hazard that slag enters a limited space through manual slag removal can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling equipment, in particular to an automatic sand cleaning device for a drilling fluid circulation tank. Background Art

[0002] In oil and gas drilling operations, drilling fluid is used as a drilling medium. The main functions of drilling fluid are: cleaning the bottom of the well, carrying cuttings; cooling and lubricating the drill bit and drill string; balancing the formation pressure, etc. The circulation process of drilling fluid is: the liquid is injected into the wellbore from the wellhead through the drill pipe, and then sprayed out from the drill bit water hole, carrying the broken cuttings back to the ground through the annulus. The returned drilling fluid carries a large amount of cuttings. The harmful solid phase in the drilling fluid is removed by solid phase control equipment on the ground. Finally, the purified drilling fluid is pressurized by the mud pump and injected into the well, thus forming a cyclic process.

[0003] During the surface circulation treatment process, the drilling fluid flows in the circulation tank, and the phenomenon of rock cuttings precipitation occurs. With the increase of sand deposition, on the one hand, the effective volume of the tank will be reduced when the sand deposition is serious, and on the other hand, the tank needs to be cleaned after the well is completed to facilitate transportation to the next well site. However, the current on-site tank cleaning method mainly relies on manual entry into the bottom of the tank for operation, which is not only labor-intensive, but also has certain safety hazards.

[0004] Therefore, how to prevent and solve the rock cuttings precipitation in the drilling fluid circulation tank during the mud circulation treatment process and avoid the safety hazard of manual slag cleaning entering the confined space is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide an automatic sand cleaning device for a drilling fluid circulation tank, which can prevent and solve the rock debris precipitation in the drilling fluid circulation tank during the mud circulation treatment process and avoid the safety hazard of manual slag cleaning entering a confined space.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an automatic sand cleaning device for a drilling fluid circulation tank, comprising:

[0007] The circulation tank is provided with a tank bin for containing the mixed liquid, and a sand settling tank is provided at the bottom of the circulation tank, which is connected to the tank bin and used for solid sedimentation in the mixed liquid. A pusher is provided in the sand settling tank to push the deposited solids to one end of the circulation tank;

[0008] The sand cleaning component includes a first delivery pipe connected to the sand settling tank, a first sand pump connected to the first delivery pipe and used for mixed liquid delivery, and a desander connected to the first delivery pipe for separating solids in the mixed liquid. The top of the desander is provided with an overflow pipe connected to the tank bin.

[0009] Preferably, the circulation tank further comprises:

[0010] Base;

[0011] An inclined plate is arranged at an angle to the horizontal plane, and a lower end of the inclined plate is connected to the top of the grit chamber so that the solids in the mixed liquid slide along the inclined plate to the grit chamber;

[0012] Several side plates are connected to the inclined plates to form a tank bin.

[0013] Preferably, an anti-disturbance plate installed on the circulation tank is provided above the sand settling tank, and the anti-disturbance plate includes two baffles set at an angle, the higher ends of the two baffles are connected to each other, and a first gap exists between the lower end of the baffle and the inclined plate.

[0014] Preferably, a grit tank is provided at one end of the grit trough connected to the first conveying pipe, and the bottom of the grit tank is lower than the bottom of the grit trough. The circulation tank is provided with a liquid inlet, a first liquid outlet and a second liquid outlet from high to low, and the second liquid outlet is used to connect the grit trough and the first conveying pipe.

[0015] Preferably, the first delivery pipe comprises:

[0016] The first tube body is connected to the second liquid outlet and the inlet of the first sand pump, and the first tube body is also provided with a first valve body for controlling the flow of the mixed liquid;

[0017] The second pipe body is connected to the outlet of the first sand pump and the inlet of the desander.

[0018] Preferably, a cleaning device is also included, which includes a second delivery pipe, a second sand pump, a third delivery pipe and a nozzle, the second delivery pipe is connected to the first liquid outlet and the inlet of the second sand pump, the second delivery pipe is provided with a second valve body for controlling the flow of the mixed liquid, the third delivery pipe is connected to the outlet and the liquid inlet of the second sand pump, and the nozzle is arranged in the tank and connected to the liquid inlet, so that the mixed liquid flowing from the liquid inlet to the nozzle is sprayed along the nozzle arranged on the nozzle.

[0019] Preferably, the sand settling tank is located in the middle of the bottom of the circulation tank, there are two inclined plates, which are respectively located on both sides of the sand settling tank, the liquid inlet and the nozzle correspond one to one and there are two of them, the two nozzles are respectively located above the two inclined plates, and the angle between the nozzle and the horizontal plane is consistent with the angle between the inclined plate and the horizontal plane.

[0020] Preferably, an agitator is provided in the circulation tank, and a detector is provided in the middle of the inclined plate.

[0021] Preferably, the sand settling trough is a U-shaped trough, and the pusher is arranged concentrically with the bottom arc of the U-shaped trough.

[0022] Preferably, it also includes a control module connected to the pusher, the first sand pump, the first valve body, the second sand pump, the second valve body, the detector, the desander and the detector;

[0023] When the detector detects that the solids reach the threshold, it sends a signal to the control module. The control module controls the pusher, the first sand pump, the first valve body and the desander to operate simultaneously for solid separation. The control module controls the second sand pump and the second valve body to operate simultaneously to extract the mixed liquid from the circulation tank to purge the inclined plate.

[0024] Compared with the above-mentioned background technology, the utility model provides an automatic sand cleaning device for a drilling fluid circulation tank, which includes a circulation tank and a sand cleaning component. A tank bin for accommodating a mixed liquid is provided inside the circulation tank, a sand settling tank connected to the tank bin and used for solid deposition in the mixed liquid is provided at the bottom of the circulation tank, and a pusher is provided in the sand settling tank to push the deposited solids to one end of the circulation tank; the sand cleaning component includes a first conveying pipe connected to the sand settling tank, a first sand pump connected to the first conveying pipe and used for conveying the mixed liquid, and a desander connected to the first conveying pipe for separating solids in the mixed liquid, and an overflow pipe connected to the tank bin is provided on the top of the desander.

[0025] Specifically, the drilling fluid carrying rock cuttings flows in the circulation tank, and the solids in the mixed liquid will be deposited under the action of centrifugation and gravity. A sand settling trough connected to the tank bin and used for the deposition of solids in the mixed liquid is provided at the bottom of the circulation tank. The pusher arranged in the sand settling trough can drive the deposited solids to one end of the circulation tank, and then the solids and part of the liquid are transported to the desander along the first conveying pipe by the first sand pump to separate the solids. The liquid can continue to flow into the circulation tank through the overflow pipe on the top of the desander for subsequent use. With this arrangement, the solids in the mixed liquid can be cleaned and screened in time, thereby preventing and solving the precipitation of rock cuttings in the drilling fluid circulation tank during the mud circulation treatment process, and avoiding the safety hazard of manual slag cleaning entering the confined space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0027] Figure 1 A front view of an automatic sand cleaning device for a drilling fluid circulation tank provided by an embodiment of the utility model;

[0028] Figure 2 A left side cross-sectional view of an automatic sand cleaning device for a drilling fluid circulation tank provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the structure of the circulation tank provided by the embodiment of the utility model;

[0030] Figure 4 A schematic diagram of the structure of the circulation tank provided by the embodiment of the utility model from another perspective;

[0031] Figure 5 A schematic diagram of the structure of a sand cleaning assembly and a cleaning device provided in an embodiment of the utility model;

[0032] Figure 6 This is a schematic structural diagram of a desander provided in an embodiment of the utility model.

[0033] in:

[0034] 1-circulation tank, 11-tank bin, 12-sand trough, 121-sand tank, 13-push device, 14-base, 15-inclined plate, 16-side plate, 17-liquid inlet, 18-first liquid outlet, 19-second liquid outlet;

[0035] 211-first pipe body, 212-first valve body, 213-second pipe body, 22-first sand pump, 23-de-sander, 231-cyclone, 232-vibrating screen box, 233-bracket, 24-overflow pipe;

[0036] 3- Anti-disturbance plate;

[0037] 41 - second delivery pipe, 411 - second valve body, 42 - second sand pump, 43 - third delivery pipe, 44 - nozzle;

[0038] 5- Agitator;

[0039] 6-Detector;

[0040] 7- Control module. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] In the description of the present invention, it should be understood that the terms "top", "bottom", "front" and "back" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0044] The utility model aims to provide an automatic sand cleaning device for a drilling fluid circulation tank, which can prevent and solve the rock debris precipitation in the drilling fluid circulation tank 1 during the mud circulation treatment process and avoid the safety hazard of manual slag cleaning entering the confined space.

[0045] See also Figures 1 to 4 To achieve the above-mentioned purpose, the utility model provides an automatic sand cleaning device for a drilling fluid circulation tank, comprising a circulation tank 1 and a sand cleaning component.

[0046] A tank bin 11 for accommodating the mixed liquid is provided inside the circulation tank 1. A grit trough 12 connected to the tank bin 11 and used for solid deposition in the mixed liquid is provided at the bottom of the circulation tank 1. A pusher 13 is provided in the grit trough 12. The pusher 13 is preferably a spiral pusher 13, that is, the pusher 13 drives the solid forward by rotating around its own axis. The grit trough 12 can adopt a U-shaped groove. The pusher 13 is concentrically arranged with the bottom arc of the U-shaped groove to push the deposited solid to one end of the circulation tank 1.

[0047] Among them, the circulation tank 1 also includes a base 14, an inclined plate 15 and a plurality of side plates 16. The inclined plate 15 is set at an angle with the horizontal plane. Preferably, the angle between the inclined plate 15 and the horizontal plane is 5 to 8 degrees, and the lower end of the inclined plate 15 is connected to the top of the sand settling tank 12. The connection method can be welded and sealed to ensure that the solids in the mixed liquid slide smoothly along the inclined plate 15 to the sand settling tank 12; the inclined plate 15 is connected to each other through a plurality of side plates 16 to form a tank bin 11. An agitator 5 is provided in the circulation tank 1. The agitator 5 can make the mixed liquid in the circulation tank 1 flow, increase the centrifugal process of the solid, and accelerate the deposition of the solid. A detector 6 is provided in the middle of the inclined plate 15. The detector 6 can detect the amount of solid deposition. The detector 6 can adopt a tuning fork type detector.

[0048] See also Figure 6The sand cleaning component includes a first conveying pipe connected to the sand settling tank 12, a first sand pump 22 connected to the first conveying pipe and used for conveying the mixed liquid, and a desander 23 connected to the first conveying pipe for separating solids in the mixed liquid. The top of the desander 23 is provided with an overflow pipe 24 connected to the tank bin 11. The desander 23 can adopt a cyclone desander, including a cyclone 231, a vibrating screen box 232 and a bracket 233. The overflow of the desander 23 returns to the circulation tank 1 through the overflow pipe 24, the bottom flow passes through the vibrating screen box 232 to screen out the rock cuttings and discard them, and the liquid passing through the vibrating screen box 232 enters the circulation tank 1 for recycling.

[0049] The drilling fluid carrying rock cuttings flows in the circulation tank 1, and the solids in the mixed liquid will be deposited under the action of centrifugation and gravity. A sand settling tank 12 connected to the tank bin 11 and used for the deposition of solids in the mixed liquid is provided at the bottom of the circulation tank 1. The pusher 13 provided in the sand settling tank 12 can drive the deposited solids to one end of the circulation tank 1, and then the solids and part of the liquid are transported to the desander 23 along the first conveying pipe by the first sand pump 22 to separate the solids. The liquid can continue to flow into the circulation tank 1 through the overflow pipe 24 at the top of the desander 23 for subsequent use. With such a configuration, the solids in the mixed liquid can be cleaned and screened in time, thereby preventing and solving the rock cuttings precipitation in the drilling fluid circulation tank 1 during the mud circulation treatment process, and avoiding the safety hazard of manual slag cleaning entering the confined space.

[0050] In this embodiment, an anti-disturbance plate 3 installed on the circulation tank 1 is provided above the sand settling tank 12. The length of the anti-disturbance plate 3 is equal to the inner length of the circulation tank 1. The setting of the anti-disturbance plate 3 can prevent the agitator 5 from stirring the mixed liquid and driving the deposited solids, thereby increasing the stability of the deposited solids.

[0051] The anti-disturbance plate 3 includes two baffles set at an angle, the two baffles are symmetrically arranged, and the higher ends of the two baffles are connected to each other. The projection of the anti-disturbance plate 3 on the horizontal plane can cover the entire sand settling trough 12 (the distance between the two opposite ends of the baffles of the anti-disturbance plate 3 is greater than the width of the upper opening of the sand settling trough 12), and there is a first gap between the lower end of the baffle and the inclined plate 15 to allow solids to fall into the sand settling trough 12 along the inclined plate 15. The angle between the baffle and the horizontal plane is preferably greater than 45°, and the distance of the first gap in the height direction is 20 to 30 mm.

[0052] A grit pool 121 is provided at one end of the grit trough 12 which is connected to the first conveying pipe, so that the solids driven by the pusher 13 can be moved to the grit pool 121 and then taken away by the first conveying pipe. The bottom of the grit pool 121 is lower than the bottom of the grit trough 12. The cross-sectional shape of the grit pool 121 can be an inverted trapezoid, that is, the side where the grit pool 121 connects to the grit trough 12 is an inclined surface, so that the solids can slide along the grit trough 12 to accumulate in the grit pool 121. The height of the grit pool 121 is 30 to 40 cm.

[0053] See also Figure 5 The circulation tank 1 is provided with a liquid inlet 17, a first liquid outlet 18 and a second liquid outlet 19 from high to low, and the second liquid outlet 19 is used to connect the sand settling tank 12 and the first delivery pipe. The first liquid outlet 18 is located above the sand settling tank 12, and the liquid inlet 17 is located above the inclined plate 15. The first delivery pipe includes a first tube body 211 and a second tube body 213. The first tube body 211 is connected to the second liquid outlet 19 and the inlet of the first sand pump 22. The first tube body 211 is also provided with a first valve body 212 for controlling the flow of the mixed liquid. The second tube body 213 is connected to the outlet of the first sand pump 22 and the inlet of the desander 23.

[0054] In another embodiment, a tee is installed on the second pipe body 213, and multiple circulation tanks 1 can be connected in parallel through flange connection, and the same desander 23 can be used to remove rock debris from the bottom of the tank. According to actual needs, multiple desanders 23 can also be connected in parallel to the same second pipe body 213 through flange connection for separating rock debris from the same circulation tank 1.

[0055] The automatic sand cleaning device of the drilling fluid circulation tank 1 also includes a cleaning device, which includes a second delivery pipe 41, a second sand pump 42, a third delivery pipe 43 and a nozzle 44. The second delivery pipe 41 is connected to the first liquid outlet 18 and the inlet of the second sand pump 42. The second delivery pipe 41 is provided with a second valve body 411 for controlling the flow of the mixed liquid. The third delivery pipe 43 is connected to the outlet of the second sand pump 42 and the liquid inlet 17. The nozzle 44 is arranged in the tank bin 11 and is connected to the liquid inlet 17. The nozzle 44 is a circular pipe, and the outer wall of the pipe of the nozzle 44 is provided with a circular hole nozzle. The aperture of the nozzle is preferably 5 to 8 mm, so that the mixed liquid flowing into the nozzle 44 along the liquid inlet 17 is sprayed along the nozzle arranged on the nozzle 44.

[0056] It should be noted that there are multiple nozzles, and preferably they are evenly arranged along the extension direction of the nozzle 44. The first sand pump 22 and the second sand pump 42 are centrifugal sand pumps. The types of the first sand pump 22 and the second sand pump 42 can also be adjusted according to actual conditions as long as the above purpose can be achieved.

[0057] In this embodiment, the sand settling tank 12 is located in the middle of the bottom of the circulation tank 1, there are two inclined plates 15, and they are respectively located on both sides of the sand settling tank 12, there are two liquid inlets 17 and two nozzles 44, and they correspond one to one. The two nozzles 44 are respectively located above the two inclined plates 15, and the spraying direction of the nozzle is the center of the circulation tank 1, and the angle between the nozzle and the horizontal plane is consistent with the angle between the inclined plate 15 and the horizontal plane, which is convenient for cleaning the inclined plate 15.

[0058] In addition, the automatic sand cleaning device of the drilling fluid circulation tank 1 also includes a control module 7 connected to the pusher 13, the first sand pump 22, the first valve body 212, the second sand pump 42, the second valve body 411, the detector 6, the desander 23 and the detector 6.

[0059] When the detector 6 detects that the solid reaches the threshold, it transmits a signal to the control module 7. The control module 7 controls the pusher 13, the first sand pump 22, the first valve body 212 and the desander 23 to operate simultaneously for solid separation. In addition, the control module 7 can also control the second sand pump 42 and the second valve body 411 to operate simultaneously to extract the mixed liquid from the circulation tank 1 to purge the inclined plate 15. After detecting that there is no sand deposition and working for a certain period of time, the control module 7 automatically controls the pusher 13, the first sand pump 22, the first valve body 212 and the desander 23 to stop working. The time from detecting that there is no sand deposition to stopping working is preferably about 10 minutes.

[0060] Among them, during the mud circulation treatment process, the control module 7 can set the automatic sand cleaning process of the relevant circulation tank 1 according to the order in which the sand deposition detection reaches the threshold value. For example, the automatic sand cleaning process of the relevant circulation tank 1 can also be set in a certain order.

[0061] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. An automatic sand cleaning device for a drilling fluid circulation tank, characterized in that: include: A circulation tank (1) is provided with a tank bin (11) for containing a mixed liquid inside, a grit trough (12) is provided at the bottom of the circulation tank (1) and is connected to the tank bin (11) and is used for solids in the mixed liquid to be deposited, and a pusher (13) is provided in the grit trough (12) to push the deposited solids to one end of the circulation tank (1); A sand cleaning component comprises a first delivery pipe connected to the sand settling tank (12), a first sand pump (22) connected to the first delivery pipe and used for delivering a mixed liquid, and a desander (23) connected to the first delivery pipe and used for separating solids in the mixed liquid, wherein an overflow pipe (24) connected to the tank (11) is provided on the top of the desander (23).

2. The automatic sand cleaning device for drilling fluid circulation tank according to claim 1 is characterized in that: The circulation tank (1) further comprises: Base (14); An inclined plate (15) is arranged at an angle to a horizontal plane, and a lower end of the inclined plate (15) is connected to the top of the grit chamber (12), so that solids in the mixed liquid slide along the inclined plate (15) to the grit chamber (12); A plurality of side plates (16) are connected to the inclined plate (15) to form the tank bin (11).

3. The automatic sand cleaning device for drilling fluid circulation tank according to claim 2 is characterized in that: An anti-disturbance plate (3) mounted on the circulation tank (1) is provided above the sand settling tank (12), the anti-disturbance plate (3) comprising two baffles arranged at an angle, the higher ends of the two baffles being connected to each other, and a first gap being present between the lower end of the baffle and the inclined plate (15).

4. The automatic sand cleaning device for drilling fluid circulation tank according to claim 2 is characterized in that: A grit chamber (121) is provided at one end of the grit chamber (12) that is connected to the first delivery pipe, and the bottom of the grit chamber (121) is lower than the bottom of the grit chamber (12). The circulation tank (1) is provided with a liquid inlet (17), a first liquid outlet (18) and a second liquid outlet (19) from top to bottom, and the second liquid outlet (19) is used to connect the grit chamber (12) and the first delivery pipe.

5. The automatic sand cleaning device for drilling fluid circulation tank according to claim 4 is characterized in that: The first delivery pipe comprises: A first tube body (211) is connected to the second liquid outlet (19) and the inlet of the first sand pump (22); the first tube body (211) is also provided with a first valve body (212) for controlling the flow of the mixed liquid; The second pipe body (213) is connected to the outlet of the first sand pump (22) and the inlet of the desander (23).

6. The automatic sand cleaning device for drilling fluid circulation tank according to claim 5 is characterized in that: The cleaning device also includes a cleaning device, which includes a second delivery pipe (41), a second sand pump (42), a third delivery pipe (43) and a nozzle (44); the second delivery pipe (41) is connected to the first liquid outlet (18) and the inlet of the second sand pump (42); the second delivery pipe (41) is provided with a second valve body (411) for controlling the flow of the mixed liquid; the third delivery pipe (43) is connected to the outlet of the second sand pump (42) and the liquid inlet (17); the nozzle (44) is arranged in the tank (11) and is connected to the liquid inlet (17), so that the mixed liquid flowing along the liquid inlet (17) to the nozzle (44) is sprayed out along the nozzle arranged on the nozzle (44).

7. The automatic sand cleaning device for drilling fluid circulation tank according to claim 6 is characterized in that: The sand settling tank (12) is located in the middle of the bottom of the circulation tank (1), there are two inclined plates (15), which are respectively located on both sides of the sand settling tank (12), the liquid inlet (17) and the nozzle (44) correspond to each other one by one and there are two of them, the two nozzles (44) are respectively located above the two inclined plates (15), and the angle between the nozzle and the horizontal plane is consistent with the angle between the inclined plate (15) and the horizontal plane.

8. The automatic sand cleaning device for drilling fluid circulation tank according to claim 6 is characterized in that: A stirrer (5) is provided in the circulation tank (1), and a detector (6) is provided in the middle of the inclined plate (15).

9. The automatic sand cleaning device for drilling fluid circulation tank according to claim 1, characterized in that: The sand settling trough (12) is a U-shaped trough, and the pusher (13) is arranged concentrically with the bottom arc of the U-shaped trough.

10. The automatic sand cleaning device for drilling fluid circulation tank according to claim 8, characterized in that: It also includes a control module (7) connected to the pusher (13), the first sand pump (22), the first valve body (212), the second sand pump (42), the second valve body (411), the detector (6), the desander (23) and the detector (6); When the detector (6) detects that the solids have reached a threshold value, it transmits a signal to the control module (7), and the control module (7) controls the pusher (13), the first sand pump (22), the first valve body (212) and the desander (23) to operate simultaneously for solids separation, and the control module (7) controls the second sand pump (42) and the second valve body (411) to operate simultaneously to extract mixed liquid from the circulation tank (1) to purge the inclined plate (15).

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