A drilling fluid filter manifold

Abstract

The present application relates to the technical fields of drilling, and discloses a drilling fluid filter manifold, which comprises a liquid inlet pipe, a liquid inlet shunt valve, a multi-stage filter assembly, a liquid outlet manifold valve and a liquid outlet pipe which are sequentially connected, wherein the multi-stage filter assembly comprises a coarse filter pipe group and a fine filter pipe group; the coarse filter pipe group comprises a coarse filter liquid inlet electric control gate valve and a coarse filter liquid outlet electric control tee valve which are respectively connected with the liquid inlet shunt valve and the liquid outlet manifold valve; the independent coarse filter pipe group and the fine filter pipe group are arranged, and an electric control gate valve is used for switching; the system can flexibly select a coarse filter mode or a fine filter mode according to the impurity condition of the drilling fluid and the working condition requirement; the problem of single filter precision and poor adaptability of the traditional single-stage filter is effectively solved; the system is integrated with two cleaning modes of backwashing and ultrasonic cleaning; online cleaning can be completed without shutdown and disassembly; and efficient and automatic maintenance is realized.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically to a drilling fluid filtration manifold. Background Technology

[0002] A drilling manifold is a component used in oil and gas drilling, consisting of multiple pipes of varying lengths connected together. Drilling manifolds are typically used in wellbore cleaning processes, where high-pressure mud pumped from the mud pump is introduced into the well to clean the bottom, remove cuttings, and complete the drilling process. They can also be used in conjunction with other operations such as cementing.

[0003] Conventional filter manifolds still have the following problems during use:

[0004] 1. Traditional drilling fluid filtration systems mainly adopt a single-stage filtration mode, which has low processing efficiency and is difficult to adapt to the filtration requirements under different working conditions.

[0005] 2. Low filter residue processing efficiency; the solid filter residue after filtration often accumulates on the surface of the filter screen, causing blockage.

[0006] 3. Cleaning and maintenance are cumbersome, requiring machine shutdown and disassembly to complete the cleaning operation, and the cleaning is difficult and incomplete. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a drilling fluid filtration manifold, which mainly solves the problems of traditional drilling fluid filtration systems that primarily employ a single-stage filtration mode, resulting in low processing efficiency, difficulty in adapting to filtration requirements under different operating conditions, easy clogging of the filter screen surface, and difficulties in subsequent cleaning and maintenance.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A drilling fluid filtration manifold, comprising:

[0010] The inlet pipe, inlet diversion valve, multi-stage filtration assembly, outlet manifold valve and outlet pipe are connected in sequence. The multi-stage filtration assembly includes a coarse filter tube group and a fine filter tube group.

[0011] The coarse filter tube assembly includes a coarse filter inlet electrically controlled gate valve and a coarse filter outlet electrically controlled three-way valve, which are respectively connected to the inlet diversion valve and the outlet manifold valve. A coarse filter mechanism is connected between the coarse filter inlet electrically controlled gate valve and the coarse filter outlet electrically controlled three-way valve.

[0012] The fine filtration tube assembly includes a fine filtration inlet electrically controlled gate valve and a fine filtration outlet electrically controlled three-way valve, which are respectively connected to the inlet diversion valve and the outlet manifold valve. A fine filtration mechanism is connected between the fine filtration inlet electrically controlled gate valve and the fine filtration outlet electrically controlled three-way valve.

[0013] A backwashing pipe assembly is provided between the coarse filter outlet electrically controlled three-way valve and the fine filter outlet electrically controlled three-way valve to clean the coarse filter tube assembly and the fine filter tube assembly.

[0014] Furthermore, both the coarse filter tube assembly and the fine filter tube assembly include two fixed external filter pipes. One of the external filter pipes has an embedded groove inside, within which an internal filter pipe can be detachably installed. The end of the internal filter pipe is equipped with a filter element. The filter elements of the coarse filter tube assembly and the fine filter tube assembly have different filtration pore sizes. A lower collection port is provided at the bottom of the external filter tube, located below the end of the filter element. A lower collection pipe is welded into the lower collection port. A sealing head is detachably installed at the bottom end of the lower collection pipe via screws. Both the coarse filter tube assembly and the fine filter tube assembly are equipped with auxiliary cleaning and decontamination removal mechanisms.

[0015] Based on the aforementioned scheme, the decontamination mechanism includes at least three external clamps installed on the outside of the filter outer pipe, and the top of the external clamps is provided with a piezoelectric ceramic transducer that contacts the filter outer pipe.

[0016] As a further embodiment of the present invention, the decontamination mechanism includes a side opening on one side of the lower collection pipe, a first inclined pipe welded into the side opening, a second inclined pipe installed at the end of the first inclined pipe via a protective electric control valve, an installation plate detachably installed at the end of the second inclined pipe via screws, a sliding rod inserted into the installation plate, a float fixedly connected to the bottom end of the sliding rod, and an installation port opened at the bottom of the first inclined pipe, an ultrasonic transducer fixedly connected to the installation port.

[0017] Furthermore, the ultrasonic transducer is inclined and located below the float.

[0018] Based on the aforementioned scheme, the inner circumference of the lower collection pipe is provided with an inner protrusion to block the collected filter residue. The inner protrusion has an annular structure and a semi-circular cross-section.

[0019] As a further embodiment of the present invention, the filter element is convex, and the convex shape is spherical or conical, preferably spherical.

[0020] Furthermore, the filter element is inclined, with the starting point of the inclined surface located at the center point of the filter element, and the whole is inclined downward with an inclination angle of 15°-45°. The lowest point of the inclined surface is connected to the cut edge of the lower collection port near the filter element.

[0021] Based on the aforementioned scheme, the outer wall of the end of the filter inner pipe is provided with three anti-foolproof key strips that cooperate with the groove. The three anti-foolproof key strips are arranged in an isosceles triangle, and the key strip located at the vertex of the isosceles triangle corresponds to the lowest point of the inclined plane.

[0022] As a further embodiment of the present invention, the backwashing pipe assembly includes a coarse filtration backwashing pipe and a fine filtration backwashing pipe that are respectively connected to the coarse filtration outlet electrically controlled three-way valve and the fine filtration outlet electrically controlled three-way valve. A backwashing electrically controlled three-way valve is installed between the coarse filtration backwashing pipe and the fine filtration backwashing pipe. A four-way pipe is installed on one of the ports of the backwashing electrically controlled three-way valve. The ends of the four-way pipe are, in sequence, a cleaning liquid port, a hot air port, and a clean water port.

[0023] Compared with the prior art, the present invention provides a drilling fluid filtration manifold, which has the following beneficial effects:

[0024] 1. By setting up independent coarse filter tube groups and fine filter tube groups and using an electrically controlled gate valve for switching, the system can flexibly select coarse or fine filtration mode according to the impurities of the drilling fluid and the working conditions, effectively solving the problems of single-stage filtration accuracy and poor adaptability of traditional single-stage filtration.

[0025] 2. The filter element of this invention adopts an innovative design with an outward convex shape or a downward sloping shape. By utilizing the principles of fluid mechanics and gravity, it changes the trajectory of particulate matter, making it easier for it to be intercepted and slide down to the collection port. This reduces the coverage of impurities on the filter screen surface, thereby delaying clogging and maintaining high filtration efficiency.

[0026] 3. The present invention, through the optimized lower collection pipe structure and the guiding design of the filter element, ensures that the filter residue can be efficiently collected and settled. The annular inner protrusion structure on the inner wall of the pipe can effectively prevent the backflow of the collected filter residue, thus ensuring the stability and reliability of the collection process.

[0027] 4. This invention integrates two cleaning modes, backwashing and ultrasonic cleaning, and can complete online cleaning without stopping the machine for disassembly. This greatly reduces maintenance time, labor intensity and operational risks, and achieves efficient and automated maintenance.

[0028] 5. This invention, through its unique "one-in-use, one-out-of-use" design concept, allows for the cleaning of the fine filtration unit during coarse filtration operations, or the cleaning of the coarse filtration unit during fine filtration operations, thus achieving parallel filtration and cleaning operations and ensuring the continuous and uninterrupted operation of the drilling fluid treatment system.

[0029] 6. The filter inner pipe of the present invention achieves quick and accurate alignment and installation through the design of groove and anti-foolproof key strip, and the two filter outer pipes are fixed by screws. This modular design makes filter element replacement, component cleaning or maintenance simple and quick.

[0030] 7. Key components of this invention, such as the filter element, are made of high-strength metal materials such as stainless steel and carbon steel, and can withstand the vibration caused by ultrasonic cleaning. The overall structure is robust, ensuring long-term stable operation of the system under high pressure and high load conditions in drilling projects.

[0031] 8. The entire process of this invention is controlled by electrically controlled gate valves and electrically controlled three-way valves, which realizes the automation and precise control of fluid path switching, backwashing and cleaning processes, reduces human operation errors, and improves the overall intelligence level and reliability of the system. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural schematic diagram of a drilling fluid filtration manifold proposed in this invention;

[0033] Figure 2 This invention proposes a drilling fluid filtration manifold. Figure 1 A schematic diagram of the rear structure;

[0034] Figure 3 This is a schematic diagram of a piezoelectric ceramic transducer and external clamp structure for a drilling fluid filtration manifold proposed in this invention.

[0035] Figure 4 This invention proposes a drilling fluid filtration manifold. Figure 3 A partial sectional view of the structure;

[0036] Figure 5 This is a schematic cross-sectional view of the lower collection pipe of a drilling fluid filtration manifold proposed in this invention.

[0037] Figure 6 This is a schematic diagram of the two-section structure of the inclined pipe of a drilling fluid filter manifold proposed in this invention;

[0038] Figure 7 This is a schematic diagram of a structural embodiment of the filter element of a drilling fluid filtration manifold proposed in this invention.

[0039] Figure 8 This is a schematic diagram of the second embodiment of the filter element of the drilling fluid filtration manifold proposed in this invention.

[0040] Figure 9 This is a schematic diagram of the third embodiment of the filter element of the drilling fluid filtration manifold proposed in this invention.

[0041] In the diagram: 1. Inlet pipe; 2. Outlet pipe; 3. Coarse filter assembly; 4. Fine filter assembly; 5. Backwashing assembly; 101. Inlet diverter valve; 201. Outlet manifold valve;

[0042] 301. Coarse filtration inlet electrically controlled gate valve; 302. Coarse filtration mechanism; 303. Coarse filtration outlet electrically controlled three-way valve;

[0043] 401. Electro-controlled gate valve for fine filtration inlet; 402. Fine filtration mechanism; 403. Electro-controlled three-way valve for fine filtration outlet;

[0044] 501. Fine filter backwash pipe; 502. Coarse filter backwash pipe; 503. Backwash electrically controlled three-way valve; 504. Cleaning fluid inlet; 505. Hot air inlet; 506. Clean water inlet;

[0045] 601. Piezoelectric ceramic transducer; 602. External clamp; 603. Side-inclined tube one; 604. Protective electric control valve; 605. Side-inclined tube two; 606. Side opening; 607. Float; 608. Sliding rod; 609. Mounting plate; 610. Ultrasonic transducer;

[0046] 701. External filter pipe; 702. Internal filter pipe; 703. Lower collection pipe; 704. Plug head; 705. Filter element; 706. Groove; 707. Lower collection port; 709. Inner protrusion. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] Please see Figures 1-9As shown, a drilling fluid filtration manifold includes: an inlet pipe 1, an inlet diverter valve 101, a multi-stage filtration assembly, an outlet manifold valve 201, and an outlet pipe 2 connected in sequence.

[0051] Currently, conventional filter manifolds have several obvious defects:

[0052] First, the filtration precision is limited and cannot simultaneously meet the requirements of coarse and fine filtration.

[0053] Secondly, the filter residue treatment efficiency is low, and the solid filter residue after filtration often accumulates on the surface of the filter screen, causing blockage.

[0054] Third, cleaning and maintenance are difficult, requiring the machine to be stopped and disassembled to complete the cleaning operation.

[0055] Therefore, a multi-stage filtration assembly is set up to meet the requirements of both coarse and fine filtration. The multi-stage filtration assembly includes coarse filter tube group 3 and fine filter tube group 4.

[0056] The coarse filter tube assembly 3 includes a coarse filter inlet electrically controlled gate valve 301 and a coarse filter outlet electrically controlled three-way valve 303, which are respectively connected to the inlet diversion valve 101 and the outlet manifold valve 201. A coarse filter mechanism 302 is connected between the coarse filter inlet electrically controlled gate valve 301 and the coarse filter outlet electrically controlled three-way valve 303.

[0057] The fine filter tube assembly 4 includes a fine filter inlet electrically controlled gate valve 401 and a fine filter outlet electrically controlled three-way valve 403, which are respectively connected to the inlet diversion valve 101 and the outlet manifold valve 201. A fine filter mechanism 402 is connected between the fine filter inlet electrically controlled gate valve 401 and the fine filter outlet electrically controlled three-way valve 403.

[0058] During coarse filtration, the coarse filtration inlet electrically controlled gate valve 301 and the coarse filtration outlet electrically controlled three-way valve 303 are opened, while the fine filtration inlet electrically controlled gate valve 401 and the fine filtration outlet electrically controlled three-way valve 403 are closed. At this time, the drilling fluid passes through the coarse filtration mechanism 302 and performs coarse filtration.

[0059] During fine filtration, the fine filtration inlet electrically controlled gate valve 401 and the fine filtration outlet electrically controlled three-way valve 403 are opened, while the coarse filtration inlet electrically controlled gate valve 301 and the coarse filtration outlet electrically controlled three-way valve 303 are closed. At this time, the drilling fluid passes through the fine filtration mechanism 402 and performs fine filtration.

[0060] During coarse filtration, the fine filtration unit 402 can be cleaned; during fine filtration, the coarse filtration unit 302 can be cleaned.

[0061] Both the coarse filter tube assembly 3 and the fine filter tube assembly 4 include two fixed external filter tubes 701. One of the external filter tubes 701 has a groove 706 inside, and an internal filter tube 702 is detachably installed in the groove 706. The end of the internal filter tube 702 is provided with a filter element 705. The filter pore size of the filter element 705 in the coarse filter tube assembly 3 and the fine filter tube assembly 4 is different. A lower collection port 707 is provided at the bottom of the external filter tube 701 and below the end of the filter element 705. A lower collection tube 703 is welded in the lower collection port 707. A plug head 704 is detachably installed at the bottom of the lower collection tube 703 by screws. Both the coarse filter tube assembly 3 and the fine filter tube assembly 4 are provided with a decontamination removal mechanism for auxiliary cleaning.

[0062] The filter residue collected by the lower collection pipe 703 is prone to backflow, so a structure is needed to block the filter residue. Specifically, the inner wall of the lower collection pipe 703 is provided with an inner protrusion 709 to block the collected filter residue. The inner protrusion 709 is an annular structure with a semi-circular cross section, thereby providing auxiliary restriction on the collected filter residue through the annular inner protrusion 709.

[0063] By inserting the inner filter pipe 702 into the groove 706, and then connecting the two outer filter pipes 701 and locking them with screws, the inner filter pipe 702 is installed and fixed. At this time, the filter element 705 at the end of the inner filter pipe 702 can effectively filter the drilling fluid entering from the inlet pipe 1, and the filtered filter residue falls from the lower collection port 707 into the lower collection pipe 703 for collection.

[0064] The choice of material for the 705 filter element is crucial to the filtration performance. High-strength metal materials such as stainless steel and carbon steel should be selected for use in high-pressure environments.

[0065] To improve the filter residue collection efficiency, multiple implementation methods can be adopted to achieve a higher filter residue collection efficiency.

[0066] Implementation method one (e.g.) Figure 7 As shown), filter element 705 is a flat type, and this is the standard setting.

[0067] Implementation Method Two (e.g.) Figure 8 As shown), filter element 705 is convex, and the convex shape is either spherical or conical, preferably spherical.

[0068] The outward-convex filter screen adopts an outward-convex curved surface or conical structure. When the fluid flows through the outward-convex surface, the flow direction is deflected. Due to inertia, the solid particles in the fluid tend to maintain their original direction of motion and are intercepted or bounced into the bottom cavity after colliding with the filter screen surface.

[0069] A key advantage of convex filters is their anti-clogging performance. Compared to traditional flat filters, the convex surface reduces the effective filtration area directly covered by impurities, allowing fluid to flow circumferentially along the curved surface, thus providing more pathways for impurities to migrate. Some studies even indicate that a well-designed convex structure can create micro-vortices on the filter surface, flushing out trapped particles and delaying pore clogging. Furthermore, convex shapes typically have higher mechanical strength, enabling them to withstand larger pressure differentials, making them suitable for high-pressure piping systems.

[0070] In terms of filter residue collection, the combination of the convex filter screen and the bottom cavity can achieve efficient directional transfer of impurities. The convex surface guides the fluid to converge at the lower collection port 707, and the particulate matter settles and accumulates under the action of gravity.

[0071] The hemispherical design facilitates uniform fluid distribution and is suitable for viscous fluids; the conical structure provides guidance, making it easier for the filter cake to slide into the collection area.

[0072] Implementation Method 3 (e.g.) Figure 9 As shown, filter element 705 is a sloping type, with the starting point of the sloping surface located at the center point of filter element 705. The entire surface is inclined downwards, and the lowest point of the sloping surface is connected to the cut edge of the lower collection port 707 near the side of filter element 705. The outer wall of the end of the filter inner pipe 702 is provided with three anti-foolproof key strips that cooperate with the groove 706. The three anti-foolproof key strips are arranged in an isosceles triangle, and the key strip located at the vertex of the isosceles triangle corresponds to the lowest point of the sloping surface. This allows for installation and use with the sloping filter element 705 to avoid non-standard installation positions.

[0073] This design emphasizes utilizing gravity to enhance the retention and guided collection of filter cake. As the fluid flows through the downward-sloping mesh, solid particles accelerate towards the mesh under gravity, increasing the probability of collision and retention. Simultaneously, the vertical component of the fluid velocity decreases, reducing impurity rebound or resuspension, thus facilitating particulate matter retention and collection.

[0074] A unique advantage of downward-sloping filters is their ability to prevent clogging. Because the mesh is tilted downwards, trapped impurities tend to slide down naturally under gravity, reducing their accumulation on the filter surface. Combined with a bottom recessed cavity design, the sliding impurities can directly enter the collection area, achieving efficient filter cake transfer.

[0075] Regarding filter cake collection, the downward-sloping filter screen and the lower collection port 707 work together to achieve continuous or semi-continuous cake discharge. The lower collection port 707 is located directly below the lower end of the inclined filter screen, directly receiving the sliding filter cake.

[0076] The tilt angle is a key design parameter for downward-sloping filters. An angle that is too small (e.g., <15°) may hinder impurities from sliding off, increasing the risk of clogging; an angle that is too large (e.g., >45°) may reduce the effective filtration area and increase system pressure drop. Therefore, the tilt angle needs to be between 15° and 45° and finely adjusted according to fluid characteristics and impurity properties.

[0077] To solve the problem of oil stains adhering to the inner wall of the pipe.

[0078] In one embodiment of the present invention, the decontamination mechanism includes at least three external clamps 602 installed on the outside of the filter outer pipe 701, and the top of the external clamps 602 is provided with a piezoelectric ceramic transducer 601 that contacts the filter outer pipe 701.

[0079] A piezoelectric ceramic transducer 601, attached to the outer wall of the filter pipe 701, converts high-frequency electrical signals into mechanical vibrations, which are then transmitted to the pipe wall. These vibrations are transmitted into the fluid inside the pipe, thereby generating the aforementioned cavitation and shearing effects.

[0080] Typically, external clamping or bundling methods are used, eliminating the need for drilling or cutting existing pipes, making installation simple. The piezoelectric ceramic transducer 601 needs to be used in conjunction with an ultrasonic generator. Although the outer filter pipe 701 is relatively thick, it may cause significant attenuation of sound wave transmission. Therefore, multiple sets of piezoelectric ceramic transducers 601 need to be installed.

[0081] In the second embodiment of the present invention, the decontamination mechanism includes a side opening 606 on one side of the lower collection pipe 703. A first inclined pipe 603 is welded inside the side opening 606. A second inclined pipe 605 is installed at the end of the first inclined pipe 603 through a protective electric control valve 604. An installation plate 609 is detachably installed at the end of the second inclined pipe 605 by screws. A sliding rod 608 is inserted into the installation plate 609. A float 607 is fixed to the bottom end of the sliding rod 608 by bolts. An installation port is opened at the bottom of the first inclined pipe 603. An ultrasonic transducer 610 is fixed to the installation port by bolts. The ultrasonic transducer 610 is inclined and located below the float 607.

[0082] During cleaning, the protective solenoid valve 604 can be opened and the plug 704 installed. At this time, the cleaning fluid inside the filter outer pipe 701 enters the lower collection pipe 703 and overflows into the side-sloping pipe 605. The movement of the slide rod 608, driven by the float 607, indicates that the ultrasonic transducer 610 is fully immersed in the cleaning fluid. The ultrasonic transducer 610, in conjunction with the ultrasonic generator, generates a cavitation effect: the ultrasonic transducer 610 radiates high-frequency ultrasonic waves (typically above 20kHz) into the water. The alternating sound pressure of the sound waves creates countless tiny vacuum "cavitation bubbles" in the liquid. These cavitation bubbles grow during the negative pressure period and rapidly collapse during the positive pressure period, instantly generating extremely strong local high pressure and high-speed micro-jet. These impact forces act on the pipe wall, effectively impacting, peeling off, and pulverizing the attached scale, biofilm, or deposits. Furthermore, the propagation of ultrasonic waves in the liquid generates a powerful unidirectional force, thereby driving the liquid to form intense turbulence and circulation. This macroscopic flow helps to wash away loosened dirt particles, preventing them from redepositing, and allows fresh water to continuously flow through the cleaned area, improving overall cleaning effectiveness.

[0083] Although the energy of ultrasound gradually decreases when it propagates in water, the expected effect can still be achieved because the side-inclined tube 605 is close to the outer filter pipe 701 and its interior is filled with a continuous cleaning fluid.

[0084] In this invention, a backwashing pipe assembly 5 is provided between the coarse filtration outlet electrically controlled three-way valve 303 and the fine filtration outlet electrically controlled three-way valve 403 to clean the coarse filtration tube assembly 3 and the fine filtration tube assembly 4. The backwashing pipe assembly 5 includes a coarse filtration backwashing pipe 502 and a fine filtration backwashing pipe 501, which are respectively connected to the coarse filtration outlet electrically controlled three-way valve 303 and the fine filtration outlet electrically controlled three-way valve 403. A backwashing electrically controlled three-way valve 503 is installed between the coarse filtration backwashing pipe 502 and the fine filtration backwashing pipe 501. A four-way pipe is installed on one of the ports of the backwashing electrically controlled three-way valve 503. The ends of the four-way pipe are, in sequence, a cleaning liquid port 504, a hot air port 505, and a clean water port 506.

[0085] During coarse filtration, the fine filtration mechanism 402 can be cleaned. At this time, the plug 704 at the bottom of the fine filtration mechanism 402 is opened. Under the action of gravity, the drilling fluid inside the two external filtration pipes 701 and the filter residue collected by the lower collection pipe 703 are discharged from the bottom of the lower collection pipe 703. Then, the cleaning fluid port 504, the hot air port 505 and the clean water port 506 are connected to the fine filtration mechanism 402 through the fine filtration backwash pipe 501 and the fine filtration outlet liquid control three-way valve 403. The cleaning fluid port 504, the hot air port 505 and the clean water port 506 are respectively connected to the external cleaning fluid pipe, the external hot air pipe and the external clean water pipe.

[0086] At this time, the clean water from the external clean water pipe first enters the fine filtration mechanism 402 from the clean water pipe port 506 and performs backwashing. The backwashed clean water and filter residue are discharged from the bottom of the lower collection pipe 703.

[0087] After rinsing with clean water for a certain period of time, the sealing head 704 is reinstalled to close the lower collection pipe 703. At this time, the cleaning fluid in the external cleaning fluid pipe enters the fine filtration mechanism 402 from the cleaning fluid port 504 and is filled. Then, the inner wall of the pipe is cleaned by the cleaning mechanism, and the filter element 705 is further cleaned.

[0088] After ultrasonic cleaning for a certain period of time, open the plug 704 to allow the cleaning fluid and filter residue inside the pipe to be discharged from the bottom of the lower collection pipe 703. Then, clean water is used again for cleaning to avoid cleaning fluid residue. Then, hot air is blown through the water and the inner wall of the pipe is dried using an external hot air pipe to minimize the mixing and interference of different liquids inside the manifold. During fine filtration, the coarse filter mechanism 302 can be cleaned, and the cleaning process of the fine filter mechanism 402 described above can be repeated.

[0089] The present invention is used in the following steps:

[0090] S1: During coarse filtration, the coarse filtration inlet solenoid valve 301 and the coarse filtration outlet solenoid three-way valve 303 are opened, and the fine filtration inlet solenoid valve 401 and the fine filtration outlet solenoid three-way valve 403 are closed. At this time, the drilling fluid passes through the coarse filtration mechanism 302 and performs coarse filtration.

[0091] S2: During fine filtration, the fine filtration inlet solenoid valve 401 and the fine filtration outlet solenoid valve 403 are opened, while the coarse filtration inlet solenoid valve 301 and the coarse filtration outlet solenoid valve 303 are closed. At this time, the drilling fluid passes through the fine filtration mechanism 402 and performs fine filtration.

[0092] S3: The filter residue is filtered out through filter element 705 and collected through the lower collection pipe 703. Different filter elements 705 can be selected for filtration operations according to the actual construction conditions.

[0093] S4: During coarse filtration, the fine filtration mechanism 402 can be cleaned. At this time, the plug 704 at the bottom of the fine filtration mechanism 402 is opened. Under the action of gravity, the drilling fluid inside the two external filtration pipes 701 and the filter residue collected by the lower collection pipe 703 are discharged from the bottom of the lower collection pipe 703. Then, the cleaning fluid port 504, the hot air port 505 and the clean water port 506 are connected to the fine filtration mechanism 402 through the fine filtration backwash pipe 501 and the fine filtration outlet liquid control three-way valve 403. The cleaning fluid port 504, the hot air port 505 and the clean water port 506 are respectively connected to the external cleaning fluid pipe, the external hot air pipe and the external clean water pipe.

[0094] S5: At this time, the clean water from the external clean water pipe first enters the fine filter mechanism 402 from the clean water pipe port 506 and performs backwashing. The backwashed clean water and filter residue are discharged from the bottom of the lower collection pipe 703. After the clean water rinses for a certain period of time, the sealing head 704 is reinstalled to complete the closure of the lower collection pipe 703. At this time, the cleaning liquid in the external cleaning liquid pipe enters the fine filter mechanism 402 from the cleaning liquid pipe port 504 and is filled. Then, the inner wall of the pipe is cleaned by the cleaning mechanism, such as external cleaning (piezoelectric ceramic transducer 601), internal cleaning (ultrasonic transducer 610), or a combination of external and internal cleaning, so that the filter element 705 can be further cleaned.

[0095] S6: After ultrasonic cleaning for a certain period of time, open the plug 704 to allow the cleaning fluid and filter residue inside the pipe to be discharged from the bottom of the lower collection pipe 703. Then, clean water is used again for cleaning to avoid cleaning fluid residue. Then, external hot air pipes are used to blow hot air through the water and dry the inner wall of the pipe to minimize the mixing and interference of different liquids inside the manifold.

[0096] S7: During fine filtration, the coarse filtration unit 302 can be cleaned by repeating the cleaning process of the fine filtration unit 402 described above.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A drilling fluid filtration manifold, characterized in that, include: The inlet pipe (1), the inlet diversion valve (101), the multi-stage filtration assembly, the outlet manifold valve (201) and the outlet pipe (2) are connected in sequence. The multi-stage filtration assembly includes a coarse filter tube group (3) and a fine filter tube group (4). The coarse filter assembly (3) includes a coarse filter inlet electrically controlled gate valve (301) and a coarse filter outlet electrically controlled three-way valve (303) that are respectively connected to the inlet diversion valve (101) and the outlet manifold valve (201). A coarse filter mechanism (302) is connected between the coarse filter inlet electrically controlled gate valve (301) and the coarse filter outlet electrically controlled three-way valve (303). The fine filtration tube assembly (4) includes a fine filtration inlet electrically controlled gate valve (401) and a fine filtration outlet electrically controlled three-way valve (403) that are respectively connected to the inlet diversion valve (101) and the outlet manifold valve (201). A fine filtration mechanism (402) is connected between the fine filtration inlet electrically controlled gate valve (401) and the fine filtration outlet electrically controlled three-way valve (403). A backwashing tube assembly (5) is provided between the coarse filter outlet electrically controlled three-way valve (303) and the fine filter outlet electrically controlled three-way valve (403) to clean the coarse filter tube assembly (3) and the fine filter tube assembly (4). Both the coarse filter tube assembly (3) and the fine filter tube assembly (4) include two fixed external filter tubes (701). One of the external filter tubes (701) has a groove (706) inside. An internal filter tube (702) is detachably installed in the groove (706). A filter element (705) is provided at the end of the internal filter tube (702). The filter pores of the filter element (705) of the coarse filter tube assembly (3) and the fine filter tube assembly (4) are different. A lower collection port (707) is provided at the bottom of the external filter tube (701) and below the end of the filter element (705). A lower collection tube (703) is welded in the lower collection port (707). A sealing head (704) is detachably installed at the bottom of the lower collection tube (703) by screws. Both the coarse filter tube assembly (3) and the fine filter tube assembly (4) are provided with a cleaning mechanism.

2. The drilling fluid filter manifold according to claim 1, characterized in that, The decontamination mechanism includes at least three external clamps (602) installed on the outside of the filter outer pipe (701), and the top of the external clamps (602) is provided with a piezoelectric ceramic transducer (601) that contacts the filter outer pipe (701).

3. A drilling fluid filtration manifold according to claim 1, characterized in that, The decontamination mechanism includes a side opening (606) on one side of the lower collection pipe (703), a side inclined tube (603) is welded inside the side opening (606), a side inclined tube (605) is installed at the end of the side inclined tube (603) through a protective electric control valve (604), an installation plate (609) is detachably installed at the end of the side inclined tube (605) through screws, a slide rod (608) is inserted inside the installation plate (609), a float (607) is fixedly connected to the bottom end of the slide rod (608), and an installation port is opened at the bottom of the side inclined tube (603), an ultrasonic transducer (610) is fixedly connected inside the installation port.

4. A drilling fluid filter manifold according to claim 3, characterized in that, The ultrasonic transducer (610) is inclined and located below the float (607).

5. A drilling fluid filter manifold according to claim 1, characterized in that, The inner circumferential wall of the lower collection pipe (703) is provided with an inner protrusion (709) to block the collected filter residue. The inner protrusion (709) is an annular structure with a semi-circular cross section.

6. A drilling fluid filtration manifold according to claim 1, characterized in that, The filter element (705) is convex, and the convex shape is either spherical or conical.

7. A drilling fluid filter manifold according to claim 1, characterized in that, The filter element (705) is inclined, with the starting point of the inclined surface located at the center point of the filter element (705). The entire surface is inclined downwards at an angle of 15°-45°. The lowest point of the inclined surface is connected to the cut edge of the lower collection port (707) on the side close to the filter element (705).

8. A drilling fluid filter manifold according to claim 7, characterized in that, The outer wall of the end of the filter inner pipe (702) is provided with three anti-foolproof key strips that cooperate with the groove (706). The three anti-foolproof key strips are arranged in an isosceles triangle, and the key strip located at the vertex of the isosceles triangle corresponds to the lowest point of the inclined plane.

9. A drilling fluid filter manifold according to claim 1, characterized in that, The backwashing pipe assembly (5) includes a coarse filtration backwashing pipe (502) and a fine filtration backwashing pipe (501) that are respectively connected to the coarse filtration outlet electrically controlled three-way valve (303) and the fine filtration outlet electrically controlled three-way valve (403). A backwashing electrically controlled three-way valve (503) is installed between the coarse filtration backwashing pipe (502) and the fine filtration backwashing pipe (501). A four-way pipe is installed on one of the ports of the backwashing electrically controlled three-way valve (503). The ends of the four-way pipe are, in sequence, a cleaning liquid port (504), a hot air port (505), and a clean water port (506).

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