Self-cleaning suction filter device for drilling pumps

Abstract

The self-cleaning suction filter device of the drilling pump comprises a filter cylinder body which is longitudinally arranged and sealed at upper and lower ends, a liquid inlet connecting end is communicated with the lower end of one side of the filter cylinder body, a liquid outlet connecting end is communicated with the upper end of the other side of the filter cylinder body opposite to the liquid inlet connecting end, a slurry outlet is formed in the bottom of the sidewall of the filter cylinder body, a negative pressure suction pipeline is communicated with the slurry outlet and the liquid outlet connecting end, a rotating shaft which is outwardly extended at the upper end and connected with a pneumatic actuator is arranged in the filter cylinder body in the axial direction, and a filter plate which is connected with a hard brush and has an edge abutting against the inner wall of the filter cylinder body is arranged on the sidewall of the rotating shaft. The filter plate in the filter cylinder body is driven to rotate by the pneumatic actuator, and the hard brush connected with the filter plate is used to clean the inner wall of the filter cylinder body. Meanwhile, the existing grouting pump is used, the negative pressure suction pipeline is newly added, and the slurry after deposition and filtration is cleaned by the negative pressure nozzle in the reverse suction process, so that the overall operation efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of drilling pumps and drilling fluid solids control circulation systems for land or marine drilling rigs, and specifically relates to a self-cleaning suction filter device for drilling pumps. Background Technology

[0002] During the use of oilfield drilling pumps, a solids control tank needs to be connected to the pump's suction line. However, the solids control tank typically accumulates various impurities during field use. Therefore, a filter device needs to be installed at the front end of the pump's suction line to prevent impurities from being drawn in during operation, which could damage the pump at various fluid contact points such as the cylinder, plunger, and cylinder liner under high pressure and high flow conditions. The filter device is connected to the pipeline using flanges or unions and employs a dense, porous filter plate structure. Due to the harsh operating conditions of the drilling pump and its insufficient suction capacity, the filter device can accumulate a large amount of filter residue in a short time. Currently, drilling pump sets are generally equipped with a priming pump to ensure suction efficiency, further shortening the effective working time of the filter device. Manual cleaning after pump shutdown is time-consuming and labor-intensive, reducing drilling efficiency. In a typical three-pump configuration, cleaning the filter device wastes a significant amount of manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to provide a self-cleaning suction filter device for drilling pumps, which solves the problems of inconvenient manual cleaning and filter residue disposal, and improves the drilling efficiency of drilling pumps and drilling rigs.

[0004] The technical solution adopted in this invention is: a self-cleaning suction filter device for drilling pumps, comprising a filter cylinder arranged longitudinally and sealed at both ends. A liquid inlet connection is connected to the lower end of one side of the filter cylinder, and a liquid outlet connection is connected to the upper end of the other side of the filter cylinder opposite to the liquid inlet connection. A slurry outlet is opened at the bottom end of the side wall of the filter cylinder. The slurry outlet and the liquid outlet connection are connected to a negative pressure adsorption pipeline. A rotating shaft extending outward from the upper end and connected to a pneumatic actuator is arranged axially inside the filter cylinder. A filter plate with its edge abutting against the inner wall of the filter cylinder and connected to a hard brush is arranged on the side wall of the rotating shaft.

[0005] The invention is further characterized in that,

[0006] The filter housing is sealed and fixed with a filter top cover at the upper end. A through hole is opened in the center of the filter top cover. A limiting cylinder is threaded into the through hole and sleeved on the outside of the rotating shaft. The inner wall of the limiting cylinder is provided with double sealing strips along the axial direction.

[0007] A cylindrical transition connection end is fixedly connected to the top of the filter cover above the corresponding limiting cylinder. The top of the rotating shaft extends upward into the transition connection end through the limiting cylinder. The pneumatic actuator is fixed above the top of the transition connection end. The output shaft of the pneumatic actuator extends downward into the transition connection end and is fixedly connected to the top of the rotating shaft.

[0008] A cylindrical stabilizer is fixed to the bottom of the inner wall of the filter body, directly opposite the rotating shaft.

[0009] The rigid brush is fixed to the edge of the filter plate by brush strips.

[0010] The negative pressure adsorption pipeline includes a priming pump whose inlet end is connected to the outlet end via a pipe. The outlet end of the priming pump is connected to a drilling pump via a pipe. A negative pressure nozzle is connected to the connecting pipe between the priming pump and the drilling pump via a branch pipe. The inlet end of the negative pressure nozzle is also connected to the slurry outlet via a pipe. The outlet end of the negative pressure nozzle is connected to a waste liquid tank or a vibrating screen.

[0011] The inlet connection is connected to the solids control tank via a pipe.

[0012] Manual butterfly valves are installed on both the inlet and outlet pipes of the injection pump.

[0013] Pneumatic butterfly valves are installed on the inlet pipe of the drilling pump and the input end of the pneumatic actuator. Pneumatic ball valves are installed on the branch pipe connecting the negative pressure nozzle to the injection pump and the pipe connecting the negative pressure nozzle to the slurry outlet. The two pneumatic butterfly valves and the two pneumatic ball valves are all connected to the main control valve in the driller's room through pipelines. The main control valve is connected to an air source through pipelines.

[0014] The beneficial effects of the present invention are as follows: The drilling pump self-cleaning suction filter device of the present invention uses a pneumatic actuator to drive the filter plate inside the filter cylinder to rotate, so that its built-in hard brush cleans the inner wall of the filter cylinder; at the same time, by adding a negative pressure adsorption pipeline to the existing injection pump, a negative pressure nozzle is used to clean the sediment and slag after filtering during the reverse suction process, thereby improving the overall operating efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the self-cleaning suction filter device for drilling pumps of the present invention;

[0016] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0017] Figure 3 This is a schematic diagram of the structure of the filter plate in the self-cleaning suction filter device for drilling pumps of the present invention;

[0018] Figure 4 This is a schematic diagram of the conventional drilling pump injection, suction, and filtration process.

[0019] Figure 5 This is a schematic diagram of the self-cleaning suction filter device for drilling pumps of the present invention during self-cleaning.

[0020] Figure 6 This is a schematic diagram of the pneumatic control mechanism in the self-cleaning suction filter device for drilling pumps of the present invention.

[0021] In the diagram, 1. Rotating shaft, 2. Inlet connection, 3. Centralizer, 4. Slurry outlet, 5. Outlet connection, 6. Filter cylinder, 7. Filter top cover, 8. Transition connection, 9. Pneumatic actuator, 10. Limiting cylinder, 11. Double sealing strip, 12. Hard brush, 13. Brush pressure strip, 14. Filter plate, 15. Injection pump, 16. Drilling pump, 17. Negative pressure nozzle, 18. Waste liquid tank, 19. Vibrating screen, 20. Solids control tank, 21. Main control valve, 22. Manual butterfly valve I, 23. Manual butterfly valve II, 24. Manual butterfly valve III, 25. Manual butterfly valve IV, 26. Pneumatic butterfly valve I, 27. Pneumatic butterfly valve II, 28. Pneumatic ball valve I, 29. Pneumatic ball valve II, 30. Filter. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a self-cleaning suction filter device for drilling pumps, such as... Figures 1 to 3As shown, the filter includes a longitudinally arranged filter cylinder 6 sealed at both ends. A rotating shaft 1, extending outwards from its upper end and connected to a pneumatic actuator 9, is axially arranged inside the filter cylinder 6. A cylindrical stabilizer 3 is fixed to the bottom of the inner wall of the filter cylinder 6, directly opposite the rotating shaft 1. A filter plate 14, with its edge abutting against the inner wall of the filter cylinder 6 and connected to a rigid brush 12, is arranged on the side wall of the rotating shaft 1. The filter plate 14 has densely perforated holes with a diameter of approximately 8 mm. The rigid brush 12 is fixed to the edge of the filter plate 14 by brush pressure strips 13, ensuring both effective suction filtration and allowing the rigid brush 12 to clean the inner wall of the filter cylinder 6 during rotation. A filter top cover 7 is sealed and fixed to the upper end of the filter cylinder 6, using a flange with sealing strips to ensure overall airtightness. A through hole is opened in the center of the filter top cover 7, and a limiting cylinder 10, fitted around the rotating shaft 1, is threaded into the through hole. Double sealing strips 11 are arranged axially on the inner wall of the limiting cylinder 10. A cylindrical transition connection end 8 is fixedly connected to the top of the filter top cover 7, corresponding to the limiting cylinder 10. The filter top cover 7 and the lower part of the transition connection end 8 can be an integral structure. The top of the rotating shaft 1 extends upward into the transition connection end 8 through the limiting cylinder 10. The pneumatic actuator 9 is fixed above the top of the transition connection end 8. The output shaft of the pneumatic actuator 9 extends downward into the transition connection end 8 and is fixedly connected to the top of the rotating shaft 1. To ensure the effect, the pneumatic actuator 9 has a double cylinder structure to increase the rotation torque. The lower end of one side of the filter cylinder 6 is connected to the liquid inlet connection end 2, which is connected to the solids control tank 20 through a pipe. The upper end of the other side of the filter cylinder 6, opposite to the liquid inlet connection end 2, is connected to the liquid outlet connection end 5. The interface between the liquid outlet connection end 5 and the liquid inlet connection end 2 is a union or flange. A slurry outlet 4 is opened at the bottom of the side wall of the filter cylinder 6. The slurry outlet 4 and the liquid outlet connection end 5 are connected to a negative pressure adsorption pipeline.

[0024] like Figure 4 As shown, during conventional drilling pump injection and filtration, under normal operating conditions, injection pump 15 is open, manual butterfly valves I 22, II 23, and IV 25 are open, and manual butterfly valve III 24 is closed. Mud is drawn into conventional filter 30 from solids control tank 20, and then enters drilling pump 16 via injection pump 15 to ensure that the drilling pump can reach its most efficient state during normal injection (if the injection efficiency of drilling pump 16 is sufficient or injection pump 15 is under maintenance, injection pump 15, manual butterfly valves I 22 and II 23 are closed, and manual butterfly valves III 24 and IV 25 are open). However, when filter 30 is clogged, it is necessary to manually disassemble its filter plate for cleaning, and the bottom sludge also needs to be cleaned and discharged separately, which shortens the effective working time of the drilling pump and reduces drilling efficiency.

[0025] like Figure 5As shown, the negative pressure adsorption pipeline of the present invention includes a priming pump 15 whose inlet end is connected to the outlet end 5 via a pipe, and the outlet end of the priming pump 15 is connected to a drilling pump 16 via a pipe. Manual butterfly valve I 22 and manual butterfly valve II 23 are respectively installed on the inlet and outlet pipes of the priming pump 15. A Venturi-type negative pressure nozzle 17 is connected to the connecting pipe between the priming pump 15 and the drilling pump 16 via a branch pipe. One side of the inlet end of the negative pressure nozzle 17 is also connected to the slurry outlet 4 via a pipe, and the outlet end of the negative pressure nozzle 17 is connected to a waste liquid tank 18 or a vibrating screen 19. Pneumatic butterfly valve I26 (replacing the existing manual butterfly valve IV25 with pneumatic butterfly valve I26) and pneumatic butterfly valve II27 are respectively installed on the inlet pipe of drilling pump 16 and the input end of pneumatic actuator 9. Pneumatic ball valve I28 and pneumatic ball valve II29 are respectively installed on the branch pipe connecting negative pressure nozzle 17 to injection pump 15 and the pipe connecting negative pressure nozzle 17 to slurry outlet 4. The two pneumatic butterfly valves and the two pneumatic ball valves are all connected to the main control valve 21 in the driller's room through pipelines. The main control valve 21 is connected to an air source through pipelines.

[0026] During self-cleaning, the drilling pump 16 stops, the pneumatic actuator 9 actuates, and the filter plate 14 rotates with the rotating shaft 1. The inlet connection 2 can be connected to the solids control tank 20 for flushing with drilling fluid, or it can be connected to the clean water pipeline in the tank area for fine cleaning. The injection pump 15 draws in liquid from the inlet connection 2 and backwashes the filter plate 14, causing the filter residue to be flushed at high speed. Since the center of the outlet connection 5 is higher than the inlet connection 2, it has a self-settling effect. The discharged light slurry is discharged to the nozzle of the negative pressure nozzle 17 by the injection pump 15, while the heavy-density waste residue, waste slurry and other impurities settle at the bottom of the filter cylinder 6 by their own weight. At the same time, under the Venturi effect of the negative pressure nozzle 17, the heavy-density waste residue, waste slurry and other impurities are drawn into the negative pressure nozzle 17 through the slurry outlet 4 and carried away at high speed. Afterwards, the slurry is sent to the waste liquid tank 18 or re-enters the vibrating screen 19 for screening and treatment. During the above process, manual butterfly valve III 24 remains closed, pneumatic butterfly valve I 26 is closed, and manual butterfly valve I 22, manual butterfly valve II 23, pneumatic ball valve I 28, pneumatic ball valve II 29, and pneumatic butterfly valve II 27 are open. The pneumatic control mechanism operates as follows: Figure 6As shown, pneumatic ball valves I28 and II29 are both 3-inch ball valves, driven by a single-acting cylinder and a two-position three-way directional valve; pneumatic butterfly valves I26 and II27 are both driven by a two-position five-way directional valve. A main control valve 21 is set up for centralized control by the driller of the drilling rig. The air source is provided by the drilling rig's air source. Since the suction end of the drilling pump 16 is large (12 inches), double-acting cylinder valves can also be used at the inlet connection 2 and the outlet connection 5 to increase the cylinder thrust and meet the requirements of large size and high torque. After stopping drilling pump 16 (with injection pump 15 running continuously, manual butterfly valves I 22 and II 23 remaining open, and manual butterfly valve III 24 remaining closed), the main control valve 21 located in the driller's cabin is opened. At this time, each pneumatic control valve group reverses direction, air enters the cylinder, and the state of each actuator is switched. That is, pneumatic butterfly valve I 26 is closed, pneumatic ball valves I 28, II 29, and II 27 are opened, pneumatic actuator 9 is started to rotate, and the negative pressure adsorption pipeline connected to the injection pump 15 branch pipeline and the slurry outlet 4 is opened. After working for a certain period of cleaning, the driller closes the main control valve 21. Except for pneumatic butterfly valves I 26 and II 27 which are air intake controls, pneumatic ball valves I 28 and II 29 are operated by the air release function of their internal springs. The valves and actuators are reset to their original working state.

[0027] Through the above-described method, the drilling pump self-cleaning suction filter device of the present invention uses a pneumatic actuator 9 to drive the filter plate 14 inside the filter cylinder 6 to rotate, causing its built-in hard brush 12 to clean the inner wall of the filter cylinder 6; simultaneously, by adding a negative pressure adsorption pipeline to the existing injection pump 15, a negative pressure nozzle is used to clean the sediment and slag after filtering during the reverse suction process, improving the overall operating efficiency. In addition, the use of pneumatic actuators allows for rapid execution of actions, meets explosion-proof environment requirements, and has low configuration costs; the filter cylinder 6 and filter top cover 7 are designed to be detachable, meeting the requirements for quick assembly and disassembly.

Claims

1. A self-cleaning suction filter device for drilling pumps, characterized in that, The filter includes a filter cylinder (6) arranged longitudinally and sealed at both ends. A rotating shaft (1) with its upper end extending outward and connected to a pneumatic actuator (9) is arranged axially inside the filter cylinder (6). A filter plate (14) with its edge abutting against the inner wall of the filter cylinder (6) and connected to a hard brush (12) is arranged on the side wall of the rotating shaft (1). A filter top cover (7) is sealed and fixed at the upper end of the filter cylinder (6). A through hole is opened in the center of the filter top cover (7), and a limiting cylinder (10) sleeved outside the rotating shaft (1) is threaded into the through hole. The inner wall of the limiting cylinder (10) is along... A double sealing strip (11) is provided axially. A cylindrical transition connection end (8) is fixedly connected above the top of the filter top cover (7) to the limiting cylinder (10). The top of the rotating shaft (1) extends upward into the transition connection end (8) through the limiting cylinder (10). The pneumatic actuator (9) is fixed above the top of the transition connection end (8). The output shaft of the pneumatic actuator (9) extends downward into the transition connection end (8) and is fixedly connected to the top of the rotating shaft (1). The lower end of one side of the filter cylinder (6) is connected to the liquid inlet connection end (2). The flow path of the filter cylinder (6) is connected to the liquid inlet connection end (2). The filter cylinder (6) has an outlet connection (5) on the upper side of the other side. The filter cylinder (6) has a slurry outlet (4) at the bottom of the side wall. The slurry outlet (4) and the outlet connection (5) are connected to a negative pressure adsorption pipeline. The negative pressure adsorption pipeline includes a priming pump (15) whose inlet end is connected to the outlet connection (5) through a pipe. The inlet and outlet pipes of the priming pump (15) are equipped with manual butterfly valves. The outlet end of the priming pump (15) is connected to the drilling pump (16) through a pipe. The inlet pipe of the drilling pump (16) and the pneumatic actuator (9) are connected to the drilling pump (16). Pneumatic butterfly valves are installed at the input end. A negative pressure nozzle (17) is connected to the pipeline connecting the injection pump (15) and the drilling pump (16) through a branch pipeline. The inlet end of the negative pressure nozzle (17) is also connected to the slurry outlet (4) through a pipeline. Pneumatic ball valves are installed on the branch pipeline connecting the negative pressure nozzle (17) and the injection pump (15) and the pipeline connecting the negative pressure nozzle (17) and the slurry outlet (4). The two pneumatic butterfly valves and the two pneumatic ball valves are connected to the main control valve (21) in the driller's room through pipelines. An air source is connected to the main control valve (21) through a pipeline.

2. The drilling pump self-cleaning suction filter device as described in claim 1, characterized in that, A cylindrical stabilizer (3) is fixed to the bottom of the inner wall of the filter cylinder (6) facing the rotating shaft (1).

3. The drilling pump self-cleaning suction filter device as described in claim 1, characterized in that, The hard brush (12) is fixed to the edge of the filter plate (14) by the brush pressure strip (13).

4. The drilling pump self-cleaning suction filter device as described in claim 1, characterized in that, The outlet end of the negative pressure nozzle (17) is connected to a waste liquid tank (18) or a vibrating screen (19).

5. The drilling pump self-cleaning suction filter device as described in claim 1, characterized in that, The liquid inlet connection (2) is connected to the solids control tank (20) through a pipe.

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