Self-cleaning device for drilling fluid vibrating screen

Abstract

The utility model provides a self-cleaning device for a drilling fluid vibrating screen. The self-cleaning device comprises a track assembly arranged on a liquid inlet buffer tank and a vibrating screen base. The driving assembly is arranged on the rail assembly, a self-spraying pipe is arranged on the driving assembly, a vibrating screen used for fixing a screen mesh is arranged in the liquid inlet buffer tank, and the driving assembly is constructed to be capable of doing axial movement along the rail assembly, so that airflow sprayed out of the self-spraying pipe is allowed to wash the screen mesh.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas drilling, in particular to a self-cleaning device for a drilling fluid vibration screen. Background Art

[0002] During the oil drilling process, the drill bit cuts rock at the bottom of the well, generating a large amount of rock cuttings and waste solids at the bottom of the well and in the wellbore. Drilling fluid of a certain density and viscosity circulates from the surface to the bottom of the well, carrying the rock cuttings and other solids back to the surface. The fluid then passes through surface vibrating screens, desanders, desilters, medium-speed centrifuges, high-speed centrifuges, and other solid-liquid separation and solid-phase control equipment for step-by-step solid-liquid separation and purification. The fluid is then pumped back into the wellbore by a drilling pump for repeated use. The vibrating screen is the first stage of solid-liquid separation and control equipment for drilling fluid. During the drilling process, over 80% of the rock cuttings and other waste solids in the solid-liquid mixture returning from the bottom of the well and in the wellbore are separated by the drilling fluid vibrating screen, which then dehydrates and dries the cuttings and recycles the drilling fluid. This vibrating screen is the core and key to the entire drilling fluid circulation, purification, and solid-phase control system.

[0003] The vibrating screen mainly uses the screen to remove cuttings and other harmful solid particles in the drilling fluid. The processing capacity and processing capacity of the vibrating screen are also achieved through the screen. The mesh size of the screen determines the separation accuracy of the vibrating screen and the size of the solid-liquid separation capacity. Therefore, the vibrating screen is the core and key of the entire vibrating screen. The screening efficiency, life and reliability of the screen directly affect the performance and life of the drilling fluid vibrating screen, directly determine the continuous operation rate of the vibrating screen, and are directly the key to whether normal drilling can be guaranteed. Once the screen is damaged, drilling will inevitably be stopped and the vibrating screen will be shut down to replace the screen. Therefore, the life of the screen directly affects the continuity of the drilling process. In addition, a damaged screen will cause a large amount of unseparated cuttings and other harmful solids to enter the drilling fluid circulation purification and solid control system together with the unpurified drilling fluid, which has a very large adverse effect on subsequent equipment purification, wear and tear of wearing parts, service life, drilling speed, etc. Since the screen is a wearing part, the main cost of using the vibrating screen is the consumption of the screen, which accounts for a high proportion of the cost of drilling wearing parts. Therefore, the life of the screen and the cost of screen consumption directly affect the level of drilling costs.

[0004] At present, except for the rare mechanical failure of the vibrating screen box or the vibration motor failure, the vast majority of reasons for drilling suspension and vibrating screen shutdown during drilling are the decrease in vibrating screen processing capacity, insufficient solid-liquid separation capacity, decrease in solid-liquid separation accuracy, screen damage and "screen sticking and slurry running" phenomenon. As long as the "screen sticking and slurry running" phenomenon occurs, it will inevitably lead to drilling suspension and vibrating screen shutdown and the screen cleaning, cleaning or replacement of the screen with lower mesh and larger screen holes, which will lead to a decrease in the vibrating screen solid-liquid separation purification accuracy and the vibrating screen continuous operation rate; in addition, due to the slow migration speed of solid phase particles or the aggregation of particle clusters on the screen surface and a tendency to continue to grow, the screen is subjected to a "kneading effect" and excessive repeated friction, resulting in partial or complete damage to the screen and shortened service life. It is also required to clean and clean the screen in time.

[0005] Therefore, it is desired in the art to provide a self-cleaning device for a drilling fluid vibrating screen to solve the above technical problems. Utility Model Content

[0006] The purpose of the utility model is to propose a self-cleaning device for a drilling fluid vibrating screen, which adopts a pneumatic cleaning method, that is, the air flow ejected from the nozzle is used to assist the pneumatic pushing of the solid phase on the screen surface, which can not only improve the migration speed and migration efficiency of the solid phase on the screen surface, but also effectively solve the problem of "screen sticking and slurry leakage" of the drilling fluid vibrating screen at the oil drilling site, thereby significantly improving the service life of the drilling fluid vibrating screen and the continuous operation rate of the working state.

[0007] According to the utility model, a self-cleaning device for a drilling fluid vibrating screen is provided, comprising a track assembly provided on a liquid inlet buffer tank and a vibrating screen base;

[0008] A driving assembly is provided on the track assembly, and a self-spraying pipe is provided on the driving assembly.

[0009] Wherein, a vibrating screen for fixing the screen is provided in the liquid inlet buffer tank.

[0010] The drive assembly is configured to be able to move axially along the track assembly, thereby allowing the screen to be flushed by the air flow ejected from the nozzle.

[0011] In one embodiment, three spaced-apart through slots are provided along the circumference of the nozzle, wherein a first airflow direction formed by one of the through slots is perpendicular to the screen, and second airflow directions formed by the remaining two through slots each form an angle of 30 to 45° with the first airflow direction.

[0012] In one embodiment, the length of the through slot is not greater than the width of the screen.

[0013] In one embodiment, the track assembly is constructed in an L-shaped structure and includes a pair of bracket tracks arranged at intervals on the liquid inlet buffer tank, and a supporting channel steel provided between the bracket tracks and the vibrating screen base.

[0014] The driving assembly includes a first driving member and a second driving member respectively arranged on the two bracket rails, and the self-spraying pipe is arranged between the first driving member and the second driving member.

[0015] In one embodiment, the first driving member and the second driving member are both connected to the well site gas source through an air inlet pipe joint.

[0016] The air inlet pipe joint is configured to output airflow outward through the nozzle only when the air inlet pipe moves along the solid sand removal direction of the vibrating screen.

[0017] In one embodiment, the first driving member includes a reducer, a tractor arranged above the reducer, and a first wheel set arranged on both sides of the reducer, wherein the first wheel set is transmission-connected to the reducer via a first flat key.

[0018] In one embodiment, the first driving member further includes a first connecting rod longitudinally arranged below the reducer.

[0019] A first fixing groove is provided at the bottom of the first connecting rod, and the self-spraying pipe forms a sealed connection with the intake pipe joint through the first fixing groove.

[0020] In one embodiment, the second driving member includes a passive shaft, a second wheel set fixed to both ends of the passive shaft by bearings, and a sealing cover plate fixed to the outside of the second wheel set by bolts, wherein a plurality of oil cups for injecting grease into the bearings are provided on the sealing cover plate.

[0021] In one embodiment, the second driving member further includes a second connecting rod connected to the passive shaft sleeve via a second flat key, a second fixing groove is provided at the bottom of the second connecting rod, and the self-nozzle forms a sealed connection with the intake pipe joint through the second fixing groove.

[0022] In one embodiment, the self-cleaning device further includes a vibration motor connected to the vibrating screen, an explosion-proof variable frequency speed control cabinet connected to the first drive member and the vibration motor respectively, and a drilling fluid circulation tank arranged below the vibrating screen base.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] First, the present invention utilizes a pneumatic cleaning method, using airflow ejected from a nozzle to assist in the pneumatic displacement of solids on the screen surface. This not only increases the speed and efficiency of solids transport across the screen surface, but also effectively addresses the issue of "slurry leakage" on drilling fluid vibrating screens at oil drilling sites, significantly increasing the lifespan and continuous operation of the screens. Furthermore, the use of airflow to sweep away solid particles from the screen surface helps dry the cuttings, reduces their liquid content, facilitates their transport, prevents leakage, and eliminates potential environmental pollution.

[0025] Secondly, the present invention provides motive air only when the nozzle moves from the rear end of the vibrating screen toward the front end of the vibrating screen, discharging solid sand. No motive air is provided in the opposite direction, i.e., the direction opposite to the solid phase movement. This assists in pneumatically moving the solid phase on the screen surface. This results in higher cleaning efficiency and a higher degree of automation, eliminating the need for manual operation. This overcomes the labor-intensive nature of manual screen cleaning and the adverse effects of volatile toxic and hazardous solvents in the drilling fluid on human health. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in detail below with reference to the accompanying drawings, in which:

[0027] Figure 1 The structure of the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown;

[0028] Figure 1a for Figure 1 A partial view showing the structure of the nozzle;

[0029] Figure 1b for Figure 1a FF cross-sectional view;

[0030] Figure 2 for Figure 1 Left view of;

[0031] Figure 3 The structure of the track assembly in the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown;

[0032] Figure 3a for Figure 3 Right view;

[0033] Figure 3b for Figure 3 A top view of

[0034] Figure 4 The structure of the first driving member in the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown;

[0035] Figure 4a for Figure 4 Left view of;

[0036] Figure 4b for Figure 4 A top view of

[0037] Figure 5 The structure of the second driving member in the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown;

[0038] Figure 5a for Figure 5 Left view of;

[0039] Figure 5b for Figure 5 Top view of .

[0040] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0041] To make the technical solutions and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, and are not exhaustive. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0043] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components.

[0044] For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] The present invention will be further described below with reference to the accompanying drawings.

[0046] Figure 1The structure of the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown;

[0047] like Figure 1 As shown, the self-cleaning device for a drilling fluid vibrating screen according to the present invention mainly includes a track assembly 20, a drive assembly, and a self-spraying pipe 13. Preferably, the track assembly 20 is mainly installed on the liquid inlet buffer tank 11 and the vibrating screen base 12, while the drive assembly is installed on the track assembly 20, and the drive assembly is capable of axial reciprocating motion on the track assembly 20, which is beneficial for subsequent cleaning work; preferably, the self-spraying pipe 13 is set at the bottom of the drive assembly and can always spray air in the direction of the screen 141 (described below) to complete the self-cleaning work.

[0048] Figure 3 The structure of the track assembly 20 in the self-cleaning device for a drilling fluid vibrating screen according to the present invention is schematically shown; Figure 3a for Figure 3 Right view; Figure 3b for Figure 3 Top view of .

[0049] In one embodiment, Figures 3-3b As shown, the track assembly 20 is constructed in an L-shaped structure and includes a pair of bracket rails (i.e., the first bracket rail 211 and the second bracket rail 212 hereinafter) spaced apart and arranged on the liquid inlet buffer tank 11, and a support channel steel 22 provided between the bracket rails and the vibrating screen base 12. Preferably, the first end of the bracket rail is securely mounted on the liquid inlet buffer tank 11 via an upper fixing plate 201, while the second end of the bracket rail is securely connected to the support channel steel 22, and the bottom of the support channel steel 22 is securely mounted on the vibrating screen base 12 via a lower fixing plate 202.

[0050] It is worth noting that the upper fixing plate 201 and the liquid inlet buffer tank 11 and the lower fixing plate 202 and the vibrating screen base 12 are fixedly connected by 8 to 12 bolts to ensure the stability of the driving assembly.

[0051] Preferably, the support channel steel 22 is composed of two spaced apart steel plates, and both ends of the support channel steel 22 are welded to the lower fixing plate 202 and the bracket rail respectively, further improving the firmness and stability of the overall structure of the track assembly 20.

[0052] According to the utility model, if Figure 1As shown, the drive assembly includes a first drive member 30 and a second drive member 40. Preferably, the first drive member 30 is mounted on the first support rail 211 and forms a sliding connection therewith. Similarly, the second drive member 40 is mounted on the second support rail 212 and forms a sliding connection therewith. Preferably, the self-spraying pipe 13 is installed between the first and second drive members 30, 40 to facilitate subsequent self-cleaning operations.

[0053] Figure 4 The structure of the first driving member 30 in the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown; Figure 4a for Figure 4 Left view of; Figure 4b for Figure 4 A top view of

[0054] In one embodiment of the present invention, Figures 4-4b As shown, the first driving member 30 includes a reducer 31, a tractor 32 (i.e., a flameproof variable frequency speed regulation traction motor) disposed above the reducer 31, and first wheel sets 33 disposed on both sides of the reducer 31. Preferably, the first wheel sets 33 are in transmission connection with the output shaft of the reducer 31 via a first flat key 34, and the output shaft of the tractor 32 is connected to the reducer 31. Therefore, under the driving action of the tractor 32 and the reducer 31, the first wheel sets 33 will be able to perform axial reciprocating motion along the first bracket rail 211.

[0055] Preferably, if Figures 4-4b As shown, an axle head cover plate 331 is provided on the outside of the first wheel set 33, and the axle head cover plate 331 is fixed to the first wheel set 33 by a plurality of axle head bolts 331 to ensure the stability and firmness of the first wheel set 33 during axial movement.

[0056] In one embodiment, Figures 4-4b As shown, the first driving member 30 further includes a first connecting rod 35 disposed longitudinally below the reducer 31. Preferably, the first connecting rod 35 is fixedly connected to the reducer 31 via bolts, and a first fixing groove 36 is formed at the bottom of the first connecting rod 35. In the present invention, the nozzle 13 can form a sealed connection with the intake pipe joint 131 (described below) through the first fixing groove 36.

[0057] Figure 5 The structure of the second driving member 40 in the self-cleaning device for drilling fluid vibrating screen according to the present invention is schematically shown; Figure 5a for Figure 5 Left view of; Figure 5b for Figure 5 Top view of .

[0058] In one embodiment of the present invention, Figures 5-5b As shown, the second driving member 40 includes a driven shaft 41 and a second wheel set 43 mounted on both ends of the driven shaft 41. Preferably, the second wheel set 43 is connected to the driven shaft 41 via a bearing 42, and the second wheel set 43 is in sliding connection with the second support rail 212. Therefore, the second wheel set 43 can perform axial reciprocating motion along the first support rail 211 under the driving action of the first driving member 30.

[0059] In one embodiment, Figures 5-5b As shown, a sealing cover plate 44 is provided on the outside of the second wheel assembly 43 and is fixed to the second wheel assembly 43 via a plurality of cover plate bolts 441 to ensure the stability and firmness of the second wheel assembly 43 during axial movement. Preferably, a sealing gasket 442 is filled between the sealing cover plate 44 and the second wheel assembly 43 to improve the sealing performance of the bearing 42.

[0060] Preferably, if Figures 5-5b As shown, two to four oil cups 45 are provided on the outside of the sealing cover plate 44, so that grease can be injected into the bearing 42 through the oil cups to lubricate the bearing 42. Accordingly, an oil seal is also provided between the second wheel set 43 and the driven shaft 41 to further ensure that the second wheel set 43 can operate smoothly.

[0061] In one embodiment, Figures 5-5b As shown, the second driving member 40 further includes a second connecting rod 46 that is sleevedly connected to the driven shaft 41 via a second flat key 47. Preferably, the second connecting rod 46 is fixedly connected to the driven shaft 41 via bolts, and a second fixing groove 48 is defined at the bottom of the second connecting rod 46. In the present invention, the nozzle 13 can form a sealed connection with the intake pipe joint 132 via the second fixing groove 48.

[0062] In the present invention, both ends of the self-nozzle 13 are connected to the first connecting rod 35 and the second connecting rod 46 by keyways to ensure the firmness and stability between the self-nozzle 13 and the first driving member 30 and the second driving member 40 .

[0063] The utility model is provided with an air inlet pipe joint 131 and an air inlet pipe joint 132 at both ends of the nozzle 13. Preferably, at any time, the well site air source or other air compressor can provide air of a certain pressure and flow rate to the two air inlet pipe joints, so that the two air inlet pipe joints can achieve the purpose of injecting gas separately or simultaneously.

[0064] Figure 2 for Figure 1 Left view of .

[0065] In this utility model, if Figure 1 and2 As shown, a vibrating screen 14 is provided in the liquid inlet buffer tank 11, and a screen 141 is fixedly mounted on the vibrating screen 14. Preferably, the first driving member 30 and the second driving member 40 are capable of axial movement along the track assembly 20, thereby driving the self-nozzle 13 to move synchronously, thereby ensuring that the airflow ejected from the self-nozzle 13 can smoothly discharge the solid phase on the screen 141 to achieve a cleaning effect.

[0066] The entire device of the present invention is actually installed on the liquid inlet buffer tank 11 and the vibrating screen base 12 that do not participate in the vibration. Although it can be hoisted and transported as an integrated whole with the vibrating screen, it does not participate in the vibration process of the vibrating screen 14, does not increase the weight of the vibrating screen 14, and does not affect the screening performance of the vibrating screen 14.

[0067] Figure 1a for Figure 1 A partial view showing the structure of the nozzle 13; Figure 1b for Figure 1a Cross-sectional view at FF.

[0068] In one embodiment, Figure 1a and 1b As shown, one to three through-slots are provided along the circumference of the nozzle 13. In this embodiment, three through-slots are used as an example, namely through-slot 101, through-slot 102, and through-slot 103. Preferably, the first airflow direction formed by through-slot 101 is directed downward, i.e., perpendicular to the direction of the screen 141; the second airflow directions formed by through-slots 102 and 103 each form an angle of 30 to 45 degrees with the first airflow direction formed by through-slot 101.

[0069] Therefore, the self-nozzle 13 can comprehensively spray and clean the screen 141 under the action of the airflow formed by the through groove, and under the action of the first driving member 30 and the second driving member 40, the self-nozzle 13 can move axially along the track assembly 20 to realize online real-time automatic cleaning, thereby preventing fine solid phases from clogging the vibrating screen mesh holes to increase the vibrating screen mesh penetration rate, thereby increasing the processing capacity of the vibrating screen 14.

[0070] Preferably, the length of the through slot is no greater than the width of the screen 141. Furthermore, the present invention can output airflow only when the vibrating screen 14 is moving in the direction of solid sand removal (no airflow is output in the opposite direction). This allows the airflow ejected from the nozzle 13 to assist in pneumatically moving the solids on the surface of the screen 141, thereby increasing the speed and efficiency of solid transport on the surface of the screen 141 and further improving the processing capacity of the vibrating screen.

[0071] Compared with the existing technology, the present invention adopts a pneumatic cleaning method, that is, the air flow ejected from the nozzle 13 is used to assist the pneumatic pushing of the solid phase on the surface of the screen 141. It can not only improve the migration speed and migration efficiency of the solid phase on the surface of the screen 141, but also effectively solve the problem of "screen sticking and slurry leakage" of the drilling fluid vibrating screen at the oil drilling site, thereby significantly improving the life of the drilling fluid vibrating screen and the continuous operation rate of the work, so as to ensure the smooth implementation of a safe, environmentally friendly, scientific and efficient drilling process.

[0072] The "slurry leakage phenomenon" is generally caused by some fine solid particles or highly viscous materials "embedded" or "blocking" the mesh of the vibrating screen during the solid-liquid separation process, or solid particles sandwiched between two layers of screen, or the solid particles or particle clusters separated by the vibrating screen fail to be transported from the surface of the vibrating screen to the sand discharge port in time, resulting in the accumulation of solid particles or particle clusters on the screen surface, or the slow solid phase migration speed and low sand discharge efficiency, which leads to the decrease of the liquid phase permeability of the vibrating screen and the "slurry leakage" phenomenon. Among them, the so-called "slurry leakage" is that on the one hand, part of the liquid phase or all of the liquid phase separated by the vibrating screen cannot flow from the screen holes into the drilling fluid circulation tank and is directly lost from the surface of the vibrating screen. On the other hand, the solid-liquid mixture containing a large amount of rock cuttings and drilling fluid returned from the bottom of the well and the wellbore is directly lost from the screen surface before solid-liquid separation and deep purification are carried out. This leads to the loss and waste of a large amount of drilling fluid, and even serious environmental pollution problems.

[0073] Preferably, the present invention can perform pneumatic cleaning on the screen 141 when the vibrating screen 14 is stopped and not working, and can also perform online pneumatic work on the screen 141 when the vibrating screen 14 is operating normally. It is worth noting that the present invention can also only provide power air when the nozzle 13 moves in the direction of solid sand removal from the rear end of the vibrating screen 14 to the front end of the vibrating screen 14, and no power air is provided in the opposite direction, that is, the opposite direction of solid phase movement, so as to assist the pneumatic pushing of the solid phase on the surface of the screen 141. Compared with the existing technology, the present invention has high cleaning efficiency and automation, does not require manual operation, and overcomes the problems of high labor intensity in manual cleaning of the screen and the volatilization of toxic and harmful solvents in the drilling fluid that have adverse effects on human health.

[0074] In addition, the utility model not only can solid phase such as rock debris, cement of screen 141 surface is removed, cleaned, cleaned, prevent solid phase from piling up on screen surface and produce the phenomenon of gathering into a mass, prevent rock debris or sticking to the " rubbing action " of screen 141, transition repeatedly rub and cause screen partial damage or all damage, shortened life problem, help to improve screen service life, also can remove the solid phase between multilayer screen 141 and jam, small solid phase or cement embedded in screen hole, ensure that the liquid phase flow channel of entering the well fluid buffer tank is unobstructed, help to improve the screen rate of vibration screen, thereby improve the processing capacity of vibration screen.

[0075] In addition, the air flow is used to blow the screen 141 surface rock debris solid phase particles, which is also helpful to improve the rock debris dryness, reduce the liquid content, facilitate the rock debris solid phase pulling operation, prevent the running, leaking and dripping phenomenon, and eliminate the environmental pollution hidden danger.

[0076] According to the utility model, the self-cleaning device for the well fluid vibrating screen also comprises a vibrating motor 15 connected with the vibrating screen 14, and a flameproof frequency conversion speed regulation control cabinet 16 connected with the first driving part 30 and the vibrating motor 15 respectively.

[0077] Preferably, the drilling fluid circulating tank 17 is arranged below the vibrating screen base 12. Since the utility model uses the gas flow formed by the gas to clean the screen 141, no liquid phase is generated, and thus the drilling fluid in the drilling fluid circulating tank 17 is not adversely affected.

[0078] Compared with the prior art, the utility model has the advantages that:

[0079] Firstly, the utility model adopts the pneumatic cleaning mode, that is, the gas flow sprayed by the self-spraying pipe 13 is used to assist the pneumatic movement of the solid phase on the surface of the screen 141, which can not only improve the movement speed and efficiency of the solid phase on the surface of the screen 141, but also effectively solve the problem of "screen clogging and slurry running" of the well fluid vibrating screen on the oil drilling site, thereby significantly improving the service life and continuous operation rate of the screen of the well fluid vibrating screen.

[0080] Secondly, the present invention provides motive air only when the nozzle 13 moves from the rear end of the vibrating screen 14 toward the front end of the vibrating screen 14, displacing solid sand. No motive air is provided in the opposite direction, i.e., the direction opposite to solid transport. This assists in pneumatically moving the solids on the surface of the screen 141. This results in a higher cleaning efficiency and a higher degree of automation, eliminating the need for manual operation. This overcomes the labor-intensive nature of manual screen cleaning and the adverse effects of volatile toxic and hazardous solvents in the drilling fluid on human health.

[0081] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art may easily make changes or modifications within the scope disclosed herein, and such changes or modifications shall be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A self-cleaning device for a drilling fluid vibrating screen, characterized in that: include: A track assembly (20) provided on the liquid inlet buffer tank (11) and the vibrating screen base (12); A driving assembly is provided on the track assembly, wherein a self-spraying pipe (13) is provided on the driving assembly. Wherein, a vibrating screen (14) for fixing a screen (141) is provided in the liquid inlet buffer tank (11). The driving assembly is configured to be able to move axially along the track assembly, thereby allowing the air flow ejected from the nozzle (13) to flush the screen (141).

2. The self-cleaning device for drilling fluid vibrating screen according to claim 1, characterized in that: Three spaced-apart through slots are provided along the circumference of the nozzle (13), wherein a first airflow direction formed by one of the through slots is perpendicular to the screen (141), and second airflow directions formed by the remaining two through slots each form an angle of 30 to 45 degrees with the first airflow direction.

3. The self-cleaning device for drilling fluid vibrating screen according to claim 2, characterized in that: The length of the through slot is no greater than the width of the screen (141).

4. The self-cleaning device for drilling fluid vibrating screen according to claim 3, characterized in that: The track assembly is constructed in an L-shaped structure and comprises a pair of bracket tracks arranged at intervals on the liquid inlet buffer tank (11), and a supporting channel steel (22) arranged between the bracket tracks and the vibrating screen base (12). The driving assembly comprises a first driving member (30) and a second driving member (40) respectively arranged on the two bracket rails, and the self-spraying pipe (13) is arranged between the first driving member (30) and the second driving member (40).

5. The self-cleaning device for drilling fluid vibrating screen according to claim 4, characterized in that: The first driving member (30) and the second driving member (40) are both connected to the well site gas source through an air inlet pipe joint. The air inlet pipe joint is configured to output airflow outward through the self-nozzle (13) only when the vibrating screen (14) moves in the solid phase sand discharge transport direction.

6. The self-cleaning device for drilling fluid vibrating screen according to claim 5, characterized in that: The first driving member (30) includes a reducer (31), a tractor (32) arranged above the reducer (31), and a first wheel set (33) arranged on both sides of the reducer (31), wherein the first wheel set (33) is transmission-connected to the reducer (31) via a first flat key (34).

7. The self-cleaning device for drilling fluid vibrating screen according to claim 6, characterized in that: The first driving member (30) further includes a first connecting rod (35) longitudinally arranged below the reducer (31). A first fixing groove (36) is provided at the bottom of the first connecting rod (35), and the self-nozzle (13) forms a sealed connection with the intake pipe joint through the first fixing groove (36).

8. The self-cleaning device for drilling fluid vibrating screen according to claim 5, characterized in that: The second driving member (40) includes a driven shaft (41), a second wheel set (43) fixed to both ends of the driven shaft (41) through bearings (42), and a sealing cover plate (44) fixed to the outside of the second wheel set (43) through bolts, wherein a plurality of oil cups (45) for injecting grease into the bearings (42) are provided on the sealing cover plate (44).

9. The self-cleaning device for drilling fluid vibrating screen according to claim 8, characterized in that: The second driving member (40) further comprises a second connecting rod (46) which is sleeve-connected to the driven shaft (41) via a second flat key (47); a second fixing groove (48) is provided at the bottom of the second connecting rod (46); and the self-nozzle (13) forms a sealed connection with the intake pipe joint via the second fixing groove (48).

10. The self-cleaning device for drilling fluid vibrating screen according to claim 4, characterized in that: The self-cleaning device further comprises a vibration motor (15) connected to the vibrating screen (14), a flameproof variable frequency speed control cabinet (16) connected to the first drive member (30) and the vibration motor (15), and a drilling fluid circulation tank (17) arranged below the vibrating screen base (12).

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