Drilling mud circulating equipment

Abstract

The invention provides drilling mud circulating equipment, and relates to the technical field of drilling. The drilling mud circulating equipment comprises a bracket and a coarse filtering assembly, the coarse filtering assembly comprises a pulp inlet pipeline, a pulp outlet pipeline and a plurality of filter pressing cylinders. And a plurality of slag discharging holes are formed in the disc surfaces of the two rotating discs. The two ends of the filter pressing cylinder are in sliding sealing connection with the disc surfaces of the two rotating discs respectively. And the plurality of slag discharge holes can be communicated with the plurality of filter pressing cylinders in a one-to-one correspondence manner. A filter pressing plate capable of sliding in a sealed mode is arranged in each filter pressing cylinder, and each filter pressing cylinder is divided into two grouting chambers through the corresponding filter pressing plate. A filter pressing hole is formed in the side wall of each grouting chamber, and each filter pressing hole is located outside the stroke range of the corresponding filter pressing plate. Each grout outlet pipeline can be communicated with the filter pressing holes in the corresponding grouting chamber, and each grouting chamber can be communicated with the grout inlet pipeline. According to the device, efficient separation treatment can be conducted on slurry, continuous filter pressing separation can be conducted on the slurry, and the requirements for continuous circulating treatment and utilization of the slurry in the drilling process are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling technology, in particular, to a drilling mud circulating device. BACKGROUND

[0002] In the process of resource drilling, the mud circulating system is crucial. Mud is not only used to cool the drill bit and carry cuttings out of the well, but also plays a role in stabilizing the well wall and balancing the formation pressure. The mud returned from the well mouth is mixed with a large amount of cuttings of different particle sizes, which must be subjected to effective solid-liquid separation treatment to recover clean mud and re-inject it into the well to achieve recycling and reduce discharge costs.

[0003] At present, the widely used technology for primary (coarse) filtration of mud is a vibrating screen or "shaking table" based on the principle of gravity separation. This type of equipment uses mechanical vibration or reciprocating motion to make mud flow on the screen or bed surface, and uses the difference in specific gravity between cuttings and liquid mud to separate and discharge larger particles of cuttings, while the mud is recovered through the filter screen. The traditional vibrating screen or "shaking table" using the principle of gravity separation has limited separation efficiency and processing capacity, and only uses the gravity of the mud itself for separation. Moreover, it has poor separation effect on fine particle cuttings and cuttings with density close to mud, resulting in a large amount of solid impurities in the recovered mud or a large amount of mud in the separated solids, causing waste.

[0004] To pursue higher separation efficiency, those skilled in the art would naturally consider introducing pressure filtration technology with stronger separation driving force. There are indeed various pressure filtration devices in the prior art, such as compartment filter presses and plate-and-frame filter presses commonly used in the mining and chemical industries. Such devices apply mechanical pressure to the slurry in a closed filter chamber to force the liquid to pass through the filter cloth and be discharged, resulting in a drier filter cake and cleaner filtrate.

[0005] However, the direct or simple modification of such traditional pressure filtration equipment and its application in the coarse filtration of drilling mud face profound and difficult technical contradictions: Contradiction between continuous operation and intermittent operation: the return of drilling mud is continuous, and after the mud is discharged for filtration treatment, it needs to be returned immediately for drilling work. The working cycle of the traditional pressure filter is strictly intermittent batch, which must first load the mud, then perform pressure filtration, and then unload the solid cake left after pressure filtration. In this way, a complete cycle is completed to start the pressure filtration of the next batch of mud. The above process increases the filtration time of the mud, and also cannot achieve continuous treatment of the mud to achieve recycling. SUMMARY

[0006] The drilling mud circulating device can efficiently separate and continuously filter mud, and can meet the requirements of continuous circulating treatment and utilization of mud in the drilling process.

[0007] Embodiments of the present application are implemented as follows: The drilling mud circulating device comprises a support, a coarse filtration assembly, a fine filtration assembly and a mud tank. The support; The coarse filtration assembly comprises an inlet pipe and an outlet pipe, and a plurality of filter cartridges are arranged in parallel on the support, each filter cartridge is located between the two rotating discs, and the two ends of the filter cartridge are in sliding sealing connection with the disc surfaces of the two rotating discs.

[0008] In some embodiments of the present application, the fine filtration assembly is a centrifugal filter.

[0009] In some embodiments of the present application, the fine filtration assembly is a centrifugal filter.

[0010] In some embodiments of the present application, each rotating disc is connected with a driving motor, the driving motor is arranged on the support, and the driving motor is used to drive the corresponding rotating disc to rotate.

[0011] In some embodiments of the present application, the first control valve and the second control valve are both electromagnetic control valves, the first control valve and the second control valve are both connected with a control unit, and the control unit is connected with the driving motor.

[0012] In some embodiments of the present invention, each of the above-mentioned grouting chambers is provided with a pressure sensor, the pressure sensor being used to monitor the pressure in the grouting chamber, and each of the pressure sensors being connected to the control unit.

[0013] In some embodiments of the present invention, each of the above-mentioned slag discharge holes is connected to a discharge pipe, and the discharge pipe is located on the side away from the filter press cylinder.

[0014] In some embodiments of the present invention, each of the above-mentioned filter press cylinders is provided with limiting members at both ends, and the filter press plate can abut against the limiting members.

[0015] In some embodiments of the present invention, a degassing pipeline is further included, the inlet end of which is connected to the slurry outlet of the fine filter assembly, and a degasser is connected in series on the degassing pipeline.

[0016] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: 1. This invention divides a filter press cylinder into two grouting chambers using a filter plate. These grouting chambers also function as filter press chambers. During the loading process, slurry is continuously injected into one grouting chamber. Simultaneously, as the pressure increases, the slurry in the other grouting chamber is compressed. The slurry passes through the filter holes into the annular filtration chamber and is finally discharged into the slurry outlet pipe for subsequent recycling. After filtration, one grouting chamber is fully filled with new slurry, while the other grouting chamber forms a relatively dry filter cake. At this point, rotating the rotating disc aligns the corresponding discharge hole on the filter cake side with the end of the filter press cylinder. The filter cake in the corresponding grouting chamber is further compressed by the expansion of the slurry in the other grouting chamber and finally discharged through the discharge hole. After the filter cake is discharged, the rotating disc is rotated so that the disc surface continues to seal the end of the filter cylinder, forming an empty grouting chamber. New mud is continuously injected into this grouting chamber, and the mud that has been loaded into another grouting chamber will be filtered. This process is repeated to continuously separate the mud, so as to meet the needs of continuous circulation and utilization of mud during drilling.

[0017] 2. In the above process, the loading of the slurry and the filtration are carried out simultaneously. Therefore, the filtration time of the slurry can be greatly shortened, thereby improving the separation efficiency of the slurry. Simultaneously, after the slurry is injected into the injection chamber, the rotating disc is rotated to make the discharge hole coincide with and connect with the other injection chamber. At this time, the pressure on one side of the filter press plate will suddenly decrease, the pressure in the injection chamber where the slurry was injected will be released, and the filter cake in the other injection chamber will be automatically discharged. This can further replace manual or mechanical active discharge of the filter cake, further improving the filtration efficiency.

[0018] 3. By rotating two rotating discs periodically, multiple filter press cylinders are driven to switch positions synchronously, allowing them to cycle between "grouting / filtration" and "slag discharge" actions. This ensures that the "slag discharge" process, which must be performed intermittently, no longer affects the overall continuous process, and can further meet the needs of continuous circulation and utilization of drilling mud during the drilling process. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a three-dimensional cross-sectional structure according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a three-dimensional contour view in one direction of an embodiment of the present invention; Figure 4 This is a three-dimensional contour view of another embodiment of the present invention; Figure 5 This is a schematic diagram of the installation structure of the coarse filter component in an embodiment of the present invention; Figure 6 This is a plan view of an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation structure of the filter press cylinder in an embodiment of the present invention; Figure 8 This is a schematic diagram of the slag discharge hole in an embodiment of the present invention; Figure 9 This is a schematic diagram of the filter press cylinder in an embodiment of the present invention.

[0021] Icons: 1-Support; 2-Inlet pipe; 3-Outlet pipe; 4-Filter press cylinder; 5-Filter press plate; 6-Injection chamber; 7-Rotating disc; 8-Slag discharge hole; 9-Transition cylinder; 10-Annular filter chamber; 11-Filter press hole; 12-Outlet branch pipe; 13-Inlet branch pipe; 14-First control valve; 15-Second control valve; 16-Centrifugal filter; 17-Drive motor; 18-Outlet pipe; 19-Limiting component; 20-Degassing pipe; 22-Degasser; 23-Mud pump. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, "multiple" means at least two.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example Please refer to Figures 1-9 This embodiment provides a drilling mud circulation device, including a support frame 1 and a coarse filter assembly. The coarse filter assembly is mainly used to coarsely filter the drilling mud after completing one drilling cooling operation, so as to remove most of the solid impurities such as rock cuttings.

[0029] Specifically, the aforementioned coarse filtration assembly includes an inlet pipe 2, an outlet pipe 3, and multiple filter cylinders 4. Two rotating disks 7 are coaxially mounted on the support 1, and multiple slag discharge holes 8 are evenly spaced along the circumference of the disk surfaces of the two rotating disks 7. The multiple filter cylinders 4 are parallel to each other and fixedly mounted on the support 1. Each filter cylinder 4 is located between two rotating disks 7, and both ends of the filter cylinder 4 are slidably and sealingly connected to the disk surfaces of the two rotating disks 7 respectively. The multiple slag discharge holes 8 can communicate one-to-one with the multiple filter cylinders 4. Each filter cylinder 4 is equipped with a filter plate 5 that can slide and seal along the axis of the filter cylinder 4, dividing the filter cylinder 4 into two grouting chambers 6. Transition cylinders 9 are sealed and fitted at both ends of the filter cylinder 4, and each transition cylinder 9 forms an annular filtration cavity 10 with the filter cylinder 4. Each grouting chamber 6 has a filter hole 11 on its side wall, and each filter hole 11 communicates with its corresponding annular filtration cavity 10. Each annular filter chamber 10 is connected to a slurry outlet branch pipe 12, and each slurry outlet branch pipe 12 is connected to the inlet end of the slurry outlet pipeline 3. A second control valve 15 is connected in series on each slurry outlet branch pipe 12. Each grouting chamber 6 is connected to a slurry inlet branch pipe 13, and each slurry inlet branch pipe 13 is connected to the outlet end of the slurry inlet pipeline 2. A first control valve 14 is connected in series on each slurry inlet branch pipe 13. The connection between each slurry inlet branch pipe 13 and the grouting chamber 6 is located outside the stroke range of the filter press plate 5.

[0030] Specifically, in some embodiments of this example, each filter press hole 11 is also located outside the travel range of the filter press plate 5, which can prevent the filter press plate 5 from passing the filter press hole 11 and causing the filter press hole 11 to depressurize the grouting chamber 6 containing the injected mud.

[0031] In this embodiment, a filter press cylinder 4 is divided into two grouting chambers 6 by a filter press plate 5, which also serve as filter press chambers. Slurry is continuously injected into one of the grouting chambers 6 of the filter press cylinder 4 during the loading operation. Simultaneously, as the pressure increases, the slurry in the other grouting chamber 6 is compressed. The slurry enters the annular filter chamber 10 through the filter press holes 11 and finally flows along the slurry outlet branch pipe 12 into the slurry outlet pipeline 3 for subsequent recycling.

[0032] After the filter press is completed, one grouting chamber 6 is filled with new slurry, while the other grouting chamber 6 has formed a relatively dry filter cake through the filter press. At this time, the rotating disk 7 is rotated so that the corresponding slag discharge hole 8 on the filter cake side of the rotating disk 7 coincides with the end of the filter press cylinder 4. The filter cake in the corresponding grouting chamber 6 will continue to be squeezed by the expansion of the slurry in the other grouting chamber 6, and finally discharged along the slag discharge hole 8.

[0033] After the filter cake is discharged, the rotating disk 7 is rotated, causing its surface to seal the end of the filter cylinder 4 again, forming an empty grouting chamber 6. New mud is continuously injected into this grouting chamber 6, and the mud already loaded into the other grouting chamber 6 will then undergo filtration. This process is repeated in a cyclical manner, enabling continuous mud separation to meet the needs of continuous mud recycling and utilization during drilling operations.

[0034] In the above process, the slurry filling and filtration are carried out simultaneously, which can greatly shorten the slurry filtration time and thus improve the slurry separation efficiency.

[0035] Meanwhile, after the slurry is injected into the grouting chamber 6, the rotating disk 7 is rotated to make the slag discharge hole 8 overlap and connect with the other grouting chamber 6. At this time, the pressure on one side of the filter press plate 5 will suddenly decrease, the pressure in the grouting chamber 6 where the slurry is injected will be released, and the filter cake in the other grouting chamber 6 will be automatically discharged. This can further replace the manual or mechanical active discharge of the filter cake, and further improve the filter press efficiency.

[0036] During the above process, the periodic rotation of two rotating disks 7 drives multiple filter press cylinders 4 to switch positions synchronously, allowing them to cycle between the "grouting / filtration" and "slag removal" actions. In this way, the "slag removal" process, which originally had to be carried out intermittently, no longer affects the overall continuous process, and can further meet the needs of continuous circulation and utilization of drilling mud during the drilling process.

[0037] Furthermore, the aforementioned mud inlet pipe 2 is directly connected to the mud outlet channel of the drilling equipment. During drilling operations, the mud that needs to be filtered and separated from the well enters the mud inlet pipe 2. In the mud inlet pipe 2, the mud is distributed to various mud inlet branch pipes 13, and finally enters the corresponding injection chamber 6 along the mud inlet branch pipes 13. During the mud injection process in the injection chamber 6, the annular filter chamber 10 corresponding to the injection chamber 6 is not connected to its corresponding mud outlet branch pipe 12, preventing the mud from being directly discharged along the mud outlet branch pipe 12. Specifically, the second control valve 15 on the annular filter chamber 10 and its corresponding mud outlet branch pipe 12 is disconnected during the above process, thus ensuring that the annular filter chamber 10 is not connected to its corresponding mud outlet branch pipe 12. Similarly, during the above process, the first control valve 14 connected in series on the mud inlet pipe 2 corresponding to the injection chamber 6 is open, allowing mud to be continuously injected into the injection chamber 6.

[0038] The aforementioned slurry outlet pipe 3 is the main component for discharging the filtered mud. After filtration, the mud enters the corresponding annular filter chamber 10 through the filter holes 11, and finally enters the corresponding slurry outlet branch pipe 12, before being discharged into the slurry outlet pipe 3. The mud that has undergone coarse filtration in the slurry outlet pipe 3 will proceed to the next process. After further processing, the mud can be injected into the well as new usable mud. During the above process, the annular filter chamber 10 corresponding to the grouting chamber 6 performing the filtration process is connected to its corresponding slurry outlet branch pipe 12, so that the mud passing through the filter holes 11 during filtration can be directly discharged along the annular filter chamber 10. Specifically, the second control valve 15 connected in series on the slurry outlet pipe 3 corresponding to the annular filter chamber 10 is open, while the second control valve 15 connected in series on the slurry inlet pipe 2 corresponding to the grouting chamber 6 performing the filtration is closed.

[0039] In some embodiments of this example, the drilling mud circulation equipment further includes a fine filter assembly, the inlet of which is connected to the outlet of the mud outlet pipe 3. Specifically, the fine filter assembly is a centrifugal filter 16.

[0040] Centrifugal filter 16 utilizes the principle of centrifugal force to perform finer filtration on the coarsely filtered slurry discharged from the slurry outlet pipe 3. After the slurry enters the centrifugal filter 16, the powerful centrifugal force causes the different components in the slurry to separate according to their density differences. Denser solid particles are thrown to the outside of the filter and adhere to the filter wall, while less dense liquids and finer impurities flow out from the center of the filter through the pores in the filter wall.

[0041] The slurry, after undergoing 16 fine filtrations in a centrifugal filter, exhibits significantly improved purity and quality. This finely filtered slurry can then be transported through dedicated pipelines to the next processing stage, allowing for direct recycling.

[0042] Furthermore, in this embodiment, each of the aforementioned rotating disks 7 is connected to a drive motor 17, which is mounted on the support 1. The drive motor 17 is used to drive the corresponding rotating disk 7 to rotate. The drive motor 17 is used to drive the rotating disk 7 to rotate to a corresponding position. Through the precise control of the drive motor 17, the rotating disk 7 can rotate at a predetermined speed and direction. When the rotating disk 7 rotates to a specific position, it can make the slag discharge hole 8 connected to the rotating disk 7 accurately align with the corresponding filter cylinder 4.

[0043] Specifically, in this embodiment, the aforementioned rotating disks 7 are all rotatably mounted on the bracket 1 via rotating shafts. After the aforementioned drive motor 17 is mounted on the bracket 1, the rotation output end of the drive motor 17 is directly connected to one end of the rotating shaft via a coupling. In this way, the rotating shaft can be directly driven to rotate, thereby driving the rotating disks 7 to rotate.

[0044] Preferably, in this embodiment, the first control valve 14 and the second control valve 15 are both electromagnetic control valves, and both the first control valve 14 and the second control valve 15 are connected to a control unit, which is connected to the drive motor 17.

[0045] The aforementioned control unit can precisely regulate the first control valve 14 and the second control valve 15 according to the working status of the drive motor 17 and the operational requirements of the entire drilling mud circulation equipment. For example, when the drive motor 17 drives the rotating disk 7 to a specific position, and the discharge hole 8 is connected to the filter press cylinder 4, the control unit will control the first control valve 14 to open according to the set parameters, allowing the mud to flow smoothly into the filter press cylinder 4 for further filtration. After the mud filtration is completed, the control unit will control the second control valve 15 to open, discharging the filtered clear liquid from the equipment, while simultaneously controlling the first control valve 14 to close to prevent untreated mud from mixing in.

[0046] This coordinated control of the electromagnetic control valves and drive motor 17 by the control unit enables the orderly operation of each component of the drilling mud circulation equipment, greatly improving the automation level and processing efficiency. Furthermore, the electromagnetic control valves have a fast response speed and high control precision, accurately executing commands issued by the control unit in a short time, ensuring the stability and reliability of the mud treatment process. In addition, the control unit can intelligently adjust based on real-time operating data, such as dynamically adjusting the opening time and degree of the first control valve 14 and the second control valve 15, as well as the speed of the drive motor 17, based on factors like mud flow rate and impurity content, thus ensuring the equipment is always in optimal working condition.

[0047] Specifically, in this embodiment, each of the above-mentioned grouting chambers 6 is equipped with a pressure sensor (not shown in the figure). The pressure sensor is used to monitor the pressure in the grouting chamber 6, and each pressure sensor is connected to the control unit.

[0048] The control unit can receive pressure data from the pressure sensor and precisely regulate the grouting process according to a preset pressure range. For example, when a batch of slurry contains a large amount of solids such as rock fragments, during the filtration process, the filter plate 5 will filter out the slurry in a shorter stroke, resulting in more filter cake remaining in the grouting chamber 6. Therefore, the control unit can determine when the grouting work in the other grouting chamber 6 should stop by analyzing the pressure data from the pressure sensor according to a preset program. This allows for precise control of the pressure on the grouting side, achieving a better filtration effect.

[0049] Preferably, in this embodiment, each of the above-mentioned slag discharge holes 8 is connected to a discharge pipe 18, and the discharge pipe 18 is located on the side away from the filter press cylinder 4. The discharge pipe 18 mainly facilitates the discharge of the filter cake passing through the slag discharge holes 8.

[0050] Preferably, in this embodiment, each of the above-mentioned filter press cylinders 4 is provided with limiting members 19 at both ends, and the filter press plate 5 can abut against the limiting members 19. The limiting members 19 are used to prevent the filter press plate 5 from detaching from the filter press cylinder 4.

[0051] In some embodiments of this example, the drilling mud circulation equipment further includes a degassing pipeline 20, the inlet end of which is connected to the mud outlet of the fine filter component, and a degasser 22 is connected in series on the degassing pipeline 20.

[0052] The deaerator 22 effectively removes gases from the drilling mud, ensuring its purity and quality. During mud circulation, the presence of gas can affect mud performance, thus adversely impacting drilling operations. Introducing the mud into the deaerator 22 through the deaerator pipeline 20 ensures that the mud entering subsequent stages does not contain excessive gas. The deaerator 22 described above is an existing structure and will not be further described here. For any unclear points, please refer to existing technology.

[0053] It should be noted that, in this embodiment, a mud pump 23 is connected in series on the aforementioned slurry inlet pipe 2. This mud pump 23 can deliver mud containing rock cuttings and other materials into the corresponding grouting chamber 6 at a certain pressure, ensuring sufficient pressure in the grouting chamber 6 during the feeding process. Furthermore, the aforementioned mud pump 23 is connected to a control unit, which can control the power and start / stop of the mud pump 23, thereby controlling whether the entire operation starts and stops, and controlling the initial pressure of the mud injected into the grouting chamber 6.

[0054] In operation, the mud pump 23 is first started. The control unit turns on the mud pump 23 according to preset parameters and adjusts it to a suitable power, so that the mud containing rock fragments and other materials is sent at a certain pressure through the mud inlet pipe 2 into the corresponding mud inlet branch, and finally enters the corresponding grouting chamber 6 along the mud inlet branch pipe 13. During the mud injection process in the grouting chamber 6, the annular filter chamber 10 corresponding to the mud injection chamber 6 is not connected to its corresponding grout outlet branch pipe 12 to prevent the mud from being directly discharged along the grout outlet branch pipe 12. Specifically, the control unit controls the second control valve 15 on the grout outlet branch pipe 12 corresponding to the annular filter chamber 10 to disconnect. Similarly, during the above process, the first control valve 14 connected in series on the mud inlet pipe 2 corresponding to the mud injection chamber 6 is open, allowing the mud to be continuously injected into the grouting chamber 6. While the mud is continuously injected into one of the grouting chambers 6 of a filter press 4 for loading operations, the mud in the other grouting chamber 6 is compressed as the pressure increases. The slurry enters the annular filter chamber 10 through the filter press hole 11, and finally flows into the slurry outlet pipe 3 along the slurry outlet branch pipe 12.

[0055] During the above process, it is necessary to ensure that both ends of the corresponding filter press cylinder 4 are sealed to the rotating disk 7, thereby ensuring that the two grouting chambers 6 are sealed in the axial direction. In this way, a relatively dry filter cake can be effectively formed in the corresponding grouting chamber 6 during the filtration process.

[0056] When one grouting chamber 6 completes the filter pressing and forms a filter cake, and the other grouting chamber 6 is filled with new slurry, the control unit will close both the first control valve 14 and the second control valve 15 corresponding to the filter press cylinder 4. Subsequently, the control unit controls the drive motor 17 to operate, and the rotating disk 7 rotates under the action of the drive motor 17. After the rotating disk 7 rotates, it aligns the grouting chamber 6 that forms the filter cake with the slag discharge hole 8 on the rotating disk 7. At this time, the filter cake in the corresponding grouting chamber 6 will continue to be squeezed under the expansion of the slurry in the other grouting chamber 6, ultimately causing the filter cake to be completely pushed out of the slag discharge hole 8.

[0057] After the filter cake is discharged, the control unit controls the drive motor 17 to operate, causing the drive motor 17 to rotate the rotating disk 7. This causes the corresponding slag discharge hole 8 to misalign, resetting and sealing the grouting chamber 6. Subsequently, the first control valve 14 corresponding to the reset grouting chamber 6 can be opened to inject new mud into it; simultaneously, the second control valve 15 corresponding to the other grouting chamber 6 is opened, and the mud in the other grouting chamber 6 begins to be pressure filtered. By repeating the above steps, the grouting, pressure filtration, and slag discharge processes are cyclically carried out through the alternating action of the rotating disk 7, thereby achieving uninterrupted mud separation and supporting continuous drilling operations.

[0058] In the above process, each movement of the two rotating disks 7 precisely links the multiple filter press cylinders 4 together. The periodic rotation of the two rotating disks 7 drives the multiple filter press cylinders 4 to synchronously switch positions, cycling between the "grouting / filtering station" and the "slag discharge station." In this way, the "slag discharge" process, which originally had to be performed intermittently, no longer affects the overall continuous process. Thus, the multiple filter press cylinders 4 are arranged circumferentially, and the control unit coordinates the opening and closing sequence of each control valve, ensuring that each filter press cylinder 4 is in a different working stage, thereby achieving a quasi-continuous output of filtrate and filter cake.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drilling mud circulation device, characterized in that, include: support; The coarse filtration assembly includes an inlet pipe, an outlet pipe, and multiple filter cylinders. Two rotating disks are coaxially mounted on a support frame. Multiple discharge holes are evenly spaced circumferentially on the surfaces of the two rotating disks. The filter cylinders are parallel to each other and fixedly mounted on the support frame. Each filter cylinder is located between two rotating disks, and both ends of each filter cylinder are slidably and sealingly connected to the surfaces of the two rotating disks. The discharge holes are connected to each filter cylinder in a one-to-one correspondence. Each filter cylinder contains a filter plate that can slide and seal along its axial direction, dividing the filter cylinder into two injection chambers. The two ends of the filter cylinder... Each of the sealing sleeves is equipped with a transition cylinder, and each transition cylinder forms an annular filtration chamber with the filter press cylinder. Each grouting chamber has a filter press hole on its side wall, and each filter press hole is connected to its corresponding annular filtration chamber. Each annular filtration chamber is connected to a slurry outlet branch pipe, and each slurry outlet branch pipe is connected to the inlet end of the slurry outlet pipeline. A second control valve is connected in series with each slurry outlet branch pipe. Each grouting chamber is connected to a slurry inlet branch pipe, and each slurry inlet branch pipe is connected to the outlet end of the slurry inlet pipeline. A first control valve is connected in series with each slurry inlet branch pipe. The connection point between each slurry inlet branch pipe and the grouting chamber is located outside the stroke range of the filter press plate.

2. The drilling mud circulation equipment according to claim 1, characterized in that, It also includes a fine filter assembly, the inlet of which is connected to the outlet of the slurry outlet pipe.

3. The drilling mud circulation equipment according to claim 2, characterized in that, The fine filtration component is a centrifugal filter.

4. The drilling mud circulation equipment according to claim 1, characterized in that, Each of the rotating disks is connected to a drive motor, which is mounted on the bracket and is used to drive the corresponding rotating disk to rotate.

5. The drilling mud circulation equipment according to claim 4, characterized in that, Both the first control valve and the second control valve are electromagnetic control valves, and both the first control valve and the second control valve are connected to a control unit, which is connected to the drive motor.

6. The drilling mud circulation equipment according to claim 5, characterized in that, Each of the grouting chambers is equipped with a pressure sensor, which is used to monitor the pressure inside the grouting chamber. Each pressure sensor is connected to the control unit.

7. The drilling mud circulation equipment according to claim 1, characterized in that, Each of the slag discharge holes is connected to a discharge pipe, which is located on the side away from the filter press cylinder.

8. The drilling mud circulation equipment according to claim 1, characterized in that, Each of the filter press cylinders is provided with limiting members at both ends, and the filter press plate can abut against the limiting members.

9. The drilling mud circulation equipment according to claim 3, characterized in that, It also includes a degassing pipeline, the inlet of which is connected to the slurry outlet of the fine filter assembly, and a degasser is connected in series on the degassing pipeline.

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