Geothermal well drilling mud circulating device

Abstract

The utility model discloses a geothermal well drilling mud circulating device, and relates to the technical field of geothermal resource development. The vibrating screen comprises a base, a screen box is arranged on the upper surface of the base, a screen frame is fixedly installed between the lower inner walls of the screen box, a screen is fixedly arranged on the upper surface of the screen frame, pressing plates are symmetrically arranged on the upper surface of the screen, and two vibrating motors are fixedly installed in the middle of the screen box. A plurality of pressing devices are symmetrically and fixedly connected to the inner surface of the screen box, a main pressure pipe is fixedly installed on one side of the upper surface of the base, and a plurality of springs are fixedly connected between the bottom of the screen box and the upper surface of the base. The mud box assembly pretreats mud to prevent the screen from being blocked, the pressing device achieves rapid replacement of the screen, and the spray head has the back washing function and the mud circulation function.

Description

Technical Field

[0001] This utility model relates to the field of geothermal resource development technology, specifically to a geothermal well drilling mud circulation device. Background Technology

[0002] The geothermal well drilling mud circulation system is a core equipment system specifically designed for the processing and recycling of drilling mud during the geothermal resource development drilling process. The system consists of a mud preparation tank, a mud storage tank, a sedimentation tank, and a circulation tank, forming the basic circulation structure. During drilling, the mud reaches the bottom of the well through the drill string, cleans the wellbore, and then carries rock cuttings back to the surface. After purification and remixing, it is reused. The vibrating screen is one of the key pieces of equipment in the geothermal well drilling circulation system. It separates drill cuttings and liquids from the drilling fluid through the vibrating screen principle, which is crucial for the normal operation of the entire circulation system and the drilling efficiency.

[0003] Traditional geothermal well drilling mud circulation vibrating screen devices often face many technical bottlenecks: On the one hand, due to the characteristics of high temperature and high solid particle content (drill cuttings account for 20%-30%) in the mud generated during geothermal well drilling, ordinary screening equipment is difficult to achieve efficient solid-liquid separation. Large particle agglomerates in the mud are prone to clogging the screen, resulting in low screening efficiency and even interruption of drilling operations; on the other hand, the screen replacement and maintenance process of traditional devices is complicated, usually requiring multiple people to work together and taking up to several hours, which cannot meet the needs of high-frequency maintenance at the drilling site and greatly reduces the efficiency of operation. Utility Model Content

[0004] To address the issues of low screening efficiency, easy clogging, and inconvenient screen replacement in geothermal well drilling mud, this invention aims to provide a geothermal well drilling mud circulation device.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: a geothermal well drilling mud circulation device, comprising a base, a screen box provided on the upper surface of the base, a mesh frame fixedly installed between the lower inner walls of the screen box, a screen fixedly installed on the upper surface of the mesh frame, pressure plates symmetrically provided on the upper surface of the screen, two vibrating motors fixedly installed in the middle of the screen box, multiple pressing devices symmetrically fixedly connected to the inner surface of the screen box, the pressing devices working in conjunction with the pressure plates, an air-cooling frame fixedly connected to the upper surface of the screen box, the air-cooling frame being located above the two vibrating motors, a mud box assembly fixedly installed on one side of the upper surface of the screen box, a main pressure pipe fixedly installed on one side of the upper surface of the base, and multiple springs fixedly connected between the bottom of the screen box and the upper surface of the base.

[0006] Preferably, the mud box assembly includes a feed box located on the upper side of one side of the screen. The lower surface of the feed box is fixedly connected to the base. A feed inlet is provided at the upper end of the feed box. A stirring shaft is rotatably connected inside the feed box. A geared motor is fixedly installed on one side of the feed box. The output end of the geared motor is fixedly connected to one end of the stirring shaft. An inclined feeding plate is fixedly connected to the lower surface of the feed box.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0008] This invention utilizes an elastic vibration system consisting of springs and a vibrating motor to achieve efficient solid-liquid separation of mud through high-frequency vibration of the screen box. The spiral stirring blades and inclined feeding plate of the mud box assembly solve the problem of mud agglomeration clogging the screen, ensuring full utilization of the screening area. Furthermore, the handwheel and screw quick-release structure of the clamping device shortens screen replacement time, meeting the high-frequency maintenance requirements of drilling operations. A circulating backwashing system using main and auxiliary pressure pipes and nozzles enables mud reuse, while the air-cooled frame and fan motor heat dissipation design ensure continuous and stable operation of the device under high-temperature conditions. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a partial structural diagram of the present utility model.

[0012] Figure 3 This is a schematic diagram of the mud box assembly structure of this utility model.

[0013] Figure 4 This is a schematic diagram of the pressing device of this utility model.

[0014] In the diagram: 11. Base; 12. Screen box; 13. Air-cooled frame; 14. Vibration motor; 15. Control box; 16. Mesh frame; 17. Screen; 18. Pressure plate; 19. Pressing device; 20. Mud box assembly; 21. Guide plate; 22. Main pressure pipe; 23. Spring; 24. Fan; 25. Secondary pressure pipe; 26. Nozzle; 27. Water pump; 28. Support plate; 29. ​​Screw; 30. Handwheel; 31. Pressing plate; 32. Anti-loosening nut; 33. Feed inlet; 34. Agitator shaft; 35. Agitator blade; 36. Gear motor; 37. Inclined discharge plate; 38. Feed box. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example: Figure 1-4 As shown, this utility model provides a geothermal well drilling mud circulation device, including a base 11. The upper surface of the base 11 is elastically connected to a screen box 12 via a spring 23. The elastic support of the spring 23 can reduce the vibration noise of the device and avoid structural fatigue caused by rigid connection. A mesh frame 16 is fixedly installed on the lower inner wall of the screen box 12, and a screen 17 is fixedly laid on the upper surface of the mesh frame 16. The screen 17 is fixed by a pressure plate 18 and a clamping device 19 symmetrically arranged inside the screen box 12. Rotating the handwheel 30 drives the screw 29 to press down the clamping plate 31, and the screen 17 is fastened to the mesh frame 16 by the pressure plate 18. The anti-loosening nut 32 and the washer lock the screw 29 to prevent vibration from loosening. When disassembling, the screw 29 is rotated in the opposite direction to realize the quick replacement of the screen 17, which is suitable for the high-frequency maintenance needs of the screen 17 in drilling operations. Two vibrating motors 14 are fixedly installed in the middle of the screen box 12 to drive the screen box 12 to vibrate at high frequency, so that the mud on the screen 17 is accelerated to separate solid and liquid under the action of vibration. The liquid passes through the screen 17 and falls into the mud pool below the base 11, while the solid particles are intercepted, completing the initial purification.

[0017] A mud box assembly 20, including a feed box 38 connected to a mud conveying pipeline, is fixedly installed on one side of the upper surface of the screen box 12. The lower surface of the feed box 38 is fixed to the base 11 and located above the screen 17, with the upper feed port 33 connected to an internally rotating stirring shaft 34. Spiral-shaped stirring blades 35 are fitted onto the outer surface of the stirring shaft 34 and are driven by a reduction motor 36 on one side of the feed box 38. After the mud carrying drill cuttings from the bottom of the well enters through the feed port 33, the stirring blades 35 break up the agglomerated mud, which is then evenly spread onto the screen 17 through the inclined discharge plate 37 fixed to the discharge port on the lower surface, avoiding local accumulation that would affect screening efficiency.

[0018] A main pressure pipe 22 is fixedly connected to the other side of the screen box 12, driven by a water pump 27 on one side of the base 11. Multiple secondary pressure pipes 25 are connected through the side of the main pressure pipe 22, and nozzles 26 are distributed on the outer surface of the secondary pressure pipes 25. The purified mud in the base 11 is sucked in by the water pump 27, diverted through the main pressure pipe 22 to the secondary pressure pipes 25, and sprayed out through the nozzles 26. On the one hand, it backwashes the screen 17 to remove drill cuttings clogging the mesh, and on the other hand, it delivers mud to the drilling area, forming a closed loop. In addition, an air-cooling frame 13 is fixedly connected to the upper surface of the screen box 12. Two fans 24 are fixed on the outer surface of the air-cooling frame 13 corresponding to the position of the vibration motor 14, which can force heat dissipation of the vibration motor 14 and prevent the motor from being damaged by overheating due to high-frequency vibration.

[0019] The clamping device 19 consists of a support plate 28 fixed to the inner wall of the screen box 12, a screw 29 threaded into the support plate 28, a handwheel 30 at the top of the screw 29, a clamping plate 31 at the bottom, and an anti-loosening nut 32 locked to the support plate 28 by a gasket. The clamping plate 31 abuts against the pressure plate 18 to achieve a stable installation of the screen 17. A guide plate 21 is fixed on one side of the base 11 to guide the mud flow out, and a control box 15 is installed on the other side. The control box 15 integrates electrical components and can intelligently adjust parameters such as the frequency of the vibrating motor 14 and the power of the water pump 27. At the same time, the mud box assembly 20, the main pressure pipe 22, the secondary pressure pipe 25, the air-cooled frame 13, and other components are integrated into the screen box 12 and fixedly supported by the base 11 to form a compact circulation system that adapts to the space requirements of geothermal well drilling scenarios.

[0020] Working principle: This device is located above the mud pit. Mud carrying drill cuttings from the bottom of the well enters the inlet 33 of the mud box assembly 20 via a conveying pipe. The reduction motor 36 is started, and its output shaft drives the stirring shaft 34 to rotate. The spirally distributed stirring blades 35 on the shaft rotate synchronously, stirring and dispersing the incoming mud and breaking up agglomerated particles. The pretreated mud slides evenly onto the surface of the screen 17 along the inclined feed plate 37 under gravity, preparing for screening.

[0021] The screen 17 is fixed by the clamping devices 19 on both sides of the inner wall of the multiple screen boxes 12. The operator rotates the handwheel 30 to make the screw 29 rotate and move downward in the support plate 28, which drives the clamping plate 31 to press down the pressure plate 18, thus fastening the screen 17 to the screen frame 16. By rotating the anti-loosening nut 32, the anti-loosening nut 32 and the washer are pushed upward against the lower surface of the support plate 28, thereby locking the screw 29 to prevent the screw 29 from loosening due to vibration. When it is necessary to disassemble the screen 17, the screw 29 is rotated in the opposite direction to make the clamping plate 31 disengage from the pressure plate 18. After removing the pressure plate 18, the screen 17 can be taken out.

[0022] After the mud falls onto the screen 17, two vibrating motors 14 are started, transmitting vibration force to the screen box 12, causing the screen box 12 and the screen 17 to vibrate at high frequency. During vibration, the mud liquid flows into the mud pool through the mesh of the screen 17, while solid particles are trapped on the surface of the screen 17, achieving solid-liquid separation. The mud in the pool is sucked in by the water pump 27, and diverted to the secondary pressure pipe 25 through the main pressure pipe 22. It is then sprayed out through the nozzle 26 on the pipe, which both backwashes the screen 17 to remove impurities clogging the mesh and transports mud into the pool, forming a circulation. At the same time, the fan 24 on the air-cooling frame 13 rotates, generating airflow to blow on the two vibrating motors 14 to prevent the vibrating motors 14 from overheating, thus achieving auxiliary cooling.

[0023] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A geothermal well drilling mud circulation device comprising a base (11) characterised in that: The upper surface of the base (11) is provided with a screen box (12), and a mesh frame (16) is fixedly installed between the lower inner walls of the screen box (12). A screen mesh (17) is fixedly installed on the upper surface of the mesh frame (16). A pressure plate (18) is symmetrically provided on the upper surface of the screen mesh (17). Two vibration motors (14) are fixedly installed in the middle of the screen box (12). Multiple pressing devices (19) are symmetrically fixedly connected to the inner surface of the screen box (12). The pressing device (19) works in conjunction with the pressure plate (18). An air-cooling frame (13) is fixedly connected to the upper surface of the screen box (12). The air-cooling frame (13) is located above the two vibration motors (14). A mud box assembly (20) is fixedly installed on one side of the upper surface of the screen box (12). A main pressure pipe (22) is fixedly installed on one side of the upper surface of the base (11). Multiple springs (23) are fixedly connected between the bottom of the screen box (12) and the upper surface of the base (11).

2. The geothermal well drilling mud circulating device of claim 1, wherein, The mud box assembly (20) includes a feed box (38), which is located on the upper side of the screen (17). The lower surface of the feed box (38) is fixedly connected to the base (11). The upper end of the feed box (38) is provided with a feed inlet (33). The inside of the feed box (38) is rotatably connected to a stirring shaft (34). A geared motor (36) is fixedly installed on one side of the feed box (38). The output end of the geared motor (36) is fixedly connected to one end of the stirring shaft (34). An inclined feeding plate (37) is fixedly connected to the lower surface of the feed box (38).

3. The geothermal well drilling mud circulating device of claim 1, wherein, The pressing device (19) includes a support plate (28), one side of which is fixedly connected to the inner surface of the sieve box (12). A screw (29) is threadedly inserted into one side of the support plate (28). A handwheel (30) is fixedly sleeved on the top of the screw (29). A pressing plate (31) is fixedly connected to the bottom of the screw (29). An anti-loosening nut (32) is threadedly sleeved on the outer surface of the lower end of the screw (29). The lower surface of the pressing plate (31) abuts against the upper surface of the pressure plate (18).

4. The geothermal well drilling mud circulating device of claim 1, wherein, A water pump (27) is fixedly installed on one side of the base (11). The output end of the water pump (27) is fixedly connected to one end of the main pressure pipe (22). Multiple secondary pressure pipes (25) are connected through one side of the main pressure pipe (22). Multiple nozzles (26) are fixedly connected to the outer surface of the multiple secondary pressure pipes (25). The input end of the water pump (27) is connected to the mud tank pipeline.

5. The geothermal well drilling mud circulating device of claim 1, wherein, Two fans (24) are fixedly connected to the outer surface of the air-cooled frame (13), and the positions of the two fans (24) correspond to the positions of the two vibration motors (14).

6. A geothermal well drilling mud circulating device as claimed in claim 2, wherein, The feed box (38) is connected to the mud conveying pipeline. The lower surface of the feed box (38) is provided with a discharge port, which is fixedly connected to the inclined discharge plate (37). Multiple stirring blades (35) are fixedly sleeved on the outer surface of the stirring shaft (34), and the multiple stirring blades (35) are distributed in a spiral shape.

7. The geothermal well drilling mud circulating device of claim 3, wherein, The anti-loose nut (32) is provided with a gasket between the support plate (28), and the upper end of the anti-loose nut (32) is fixedly abutted with the support plate (28) through the gasket.

8. The geothermal well drilling mud circulating device of claim 1, wherein, One side of the base (11) is fixedly connected with a flow guide plate (21), and the other side of the base (11) is fixedly installed with a control box (15).

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