A drilling fluid filter manifold

Abstract

The present invention relates to the field of drilling technology, and in particular to a drilling fluid filtering manifold, comprising: a main pipeline, a shunt pipe, a telescopic mechanism and a filter screen, wherein the main pipeline is connected to one end of the shunt pipe, the end of the main pipeline is connected to a pump station, the main pipeline and the shunt pipe are both installed on a bottom plate, the other end of the shunt pipe is connected to a drain pipe, a telescopic mechanism is provided on the shunt pipe, the telescopic mechanism is connected to the filter screen, the filter screen is provided in the shunt pipe, and by providing the filter screen in the shunt pipe, solid particle impurities in the drilling fluid are filtered during the drilling fluid transportation process, thereby improving the cleaning effect of the drilling fluid entering the bottom of the well on the wellbore, and at the same time improving the quality of the drilled wellbore.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, and in particular to a drilling fluid filtering manifold. Background Art

[0002] Drilling manifold is a component used in oil and gas drilling. It is made up of multiple pipes of different lengths. Drilling manifold is usually used in the process of cleaning the wellbore. It can clean the bottom of the well and remove the cuttings by introducing the high-pressure mud discharged by the mud pump into the well to complete the drilling process. It can also cooperate with other operations such as cementing.

[0003] However, the prior art still has shortcomings. For example, patent number: CN201420655312.1 is a drilling manifold, which includes a shotcrete pipe, a return pipe and a throttling pipe. The shotcrete pipe is respectively connected to a density meter and a flow change valve, and the return pipe is connected to a return control valve. The device has a complex structure and cannot effectively handle solid particle impurities in the drilling fluid, thereby reducing the cleaning effect of the wellbore. Summary of the invention

[0004] The present invention provides a drilling fluid filtering manifold to solve the problem raised in the background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions: a drilling fluid filtration manifold, comprising: a main pipeline, a shunt pipe, a telescopic mechanism and a filter screen, wherein the main pipeline is connected to one end of the shunt pipe, the end of the main pipeline is connected to the pump station, the main pipeline and the shunt pipe are both installed on a bottom plate, the other end of the shunt pipe is connected to the drain pipe, a telescopic mechanism is arranged on the shunt pipe, the telescopic mechanism is connected to the filter screen, and the filter screen is arranged in the shunt pipe.

[0006] Preferably, the telescopic mechanism includes: a slider, a return spring and a sealing arc. A slot is provided on the diverter tube, a slider is slidably connected in the slot, an end of the slider is connected to the inner wall of the slot via a return spring, the return spring is arranged between the slider and the main pipe, the bottom end of the slider is connected to the top end of the filter screen via a sealing arc, the filter screen is slidably connected to the diverter tube, the sealing arc is slidably connected to the diverter tube, and the top of the sealing arc is sealed to the bottom end of the slot.

[0007] Preferably, both ends of the sealing arc are provided with chamfers.

[0008] Preferably, a plurality of lifting rings are provided on the top surface of the base plate.

[0009] Preferably, the bottom of the base plate is provided with a plurality of legs, the bottom surface of the legs is provided with the bottom end of a screw hole, the top end of the screw hole is provided on the top surface of the base plate, the inner thread of the screw hole is connected with a positioning drill pipe, and the conical bottom end of the positioning drill pipe is arranged below the legs.

[0010] Preferably, the side wall of the positioning drill pipe is provided with a plurality of drainage openings, and the drainage openings are arranged below the bottom plate.

[0011] Preferably, a plurality of reinforcing ribs are longitudinally arranged on the inner wall of the positioning drill tube.

[0012] Preferably, the diverter pipe is provided with two spherical cavities, the notch is arranged between the two spherical cavities, the two spherical cavities are connected by a backwash pipe, the bottom wall of the spherical cavity is rotatably connected with the bottom end of the ball valve, the ball valve is passed through to the top of the spherical cavity with a connecting plate, the connecting plate is provided with a rotating shaft, a guide hole is opened through the ball valve, the guide hole is coaxially arranged with the diverter pipe, the end of the backwash hole is opened on the side of the ball valve, the end of the backwash hole is arranged toward the inner wall of the diverter pipe, the other end of the backwash hole is connected to the guide hole, a driving rod is installed on the top of the slider, and both ends of the driving rod are rotatably connected to a rotating shaft.

[0013] Preferably, a guide tube is installed on the shunt tube, the end of the guide tube is arranged toward the reset spring, and the other end of the guide tube is arranged toward the drain tube. A second spherical cavity is provided on the guide tube, and the bottom wall of the second spherical cavity is rotatably connected to the bottom end of the second ball valve. An unlocking hole is penetrated through the second ball valve, and the unlocking hole is arranged parallel to the shunt tube. An unlocking shaft of the second ball valve passing through the top surface of the second spherical cavity is equipped with a gear, the gear is meshed with a rack, and the rack is connected to the top of the slider.

[0014] Preferably, the bottom wall of the guide tube is rotatably connected to the bottom end of the crushing shaft, the side wall of the crushing shaft is equipped with a plurality of blades, the blades are placed in the guide tube, and the top end of the crushing shaft passes through the outside of the guide tube.

[0015] The beneficial effects of the present invention are as follows:

[0016] In the scheme of the present invention:

[0017] By setting a filter in the shunt pipe, solid particle impurities in the drilling fluid are filtered during the drilling fluid transportation process, thereby improving the cleaning effect of the drilling fluid entering the bottom of the well on the wellbore and improving the quality of the drilled wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 It is a cross-sectional view of the positioning drill pipe of the present invention;

[0020] Figure 3 It is a schematic diagram of the installation position of the telescopic mechanism of the present invention;

[0021] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0022] Figure 5It is a top cross-sectional view of a ball valve of the present invention;

[0023] Figure 6 A schematic diagram of the position of the sealing arc chamfer of the present invention;

[0024] Figure 7 This is a schematic diagram of the installation position of the second ball valve of the present invention;

[0025] Figure 8 is a top cross-sectional view of a second ball valve of the present invention;

[0026] Fig. 9 It is a schematic diagram of the installation position of the blade of the present invention;

[0027] Fig.10 This is a schematic diagram of the installation position of the crushing chamber of the present invention;

[0028] Fig.11 It is a schematic diagram of the auxiliary drive mechanism structure of the present invention.

[0029] Among them: main pipeline 1, diversion pipe 2, telescopic mechanism 3, filter screen 4, slider 5, reset spring 6, sealing arc 7, lifting ring 8, support foot 9, positioning drill pipe 10, reinforcing rib 11, spherical cavity 12, backwash pipe 13, ball valve 14, diversion hole 15, backwash hole 16, drive rod 17, guide pipe 18, second spherical cavity 19, second ball valve 20, unlocking hole 21, rack 22, crushing shaft 23, paddle 24, crushing cavity 25, second filter screen 26, crushing plate 27, pressure relief hole 28, second reset spring 29, inclined surface 30, auxiliary crushing plate 31, third reset spring 32, moving rod 33, auxiliary driving mechanism 34, second rack 35, auxiliary shaft 36, bevel gear 37, second bevel gear 38, special-shaped tooth 39. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] Example: Reference Figure 1-Figure 11 A drilling fluid filtering manifold comprises: a main pipeline 1, a shunt pipe 2, a telescopic mechanism 3 and a filter screen 4, wherein the main pipeline 1 is connected to one end of the shunt pipe 2, the end of the main pipeline 1 is connected to a pump station, the main pipeline 1 and the shunt pipe 2 are both installed on a bottom plate, the other end of the shunt pipe 2 is connected to a drain pipe, a telescopic mechanism 3 is provided on the shunt pipe 2, the telescopic mechanism 3 is connected to the filter screen 4, and the filter screen 4 is provided in the shunt pipe 2.

[0032] The principles and beneficial effects of the above scheme are:

[0033] The base plate is installed on the ground at the drilling site. The main pipeline 1 on the base plate is connected to the pump station. The drilling fluid is supplied to the main pipeline 1 through the pump station. The main pipeline 1 is connected to the shunt pipe 2 to form a manifold. The drilling fluid in the main pipeline 1 is input into the drainage pipe through the shunt pipe 2, and the drilling fluid is finally input into the wellbore through the drainage pipe. A telescopic mechanism 3 is provided on the shunt pipe 2. The telescopic mechanism 3 is connected to a filter 4. The filter 4 is installed in the shunt pipe 2. By arranging the filter 4 in the shunt pipe 2, solid particle impurities in the drilling fluid are filtered during the drilling fluid transportation process, thereby improving the cleaning effect of the drilling fluid entering the bottom of the well on the wellbore, and at the same time improving the quality of the drilled wellbore.

[0034] The telescopic mechanism 3 includes: a slider 5, a return spring 6 and a sealing arc 7. A slot is opened on the shunt pipe 2, and the slider 5 is slidably connected in the slot. The end of the slider 5 is connected to the inner wall of the slot through the return spring 6. The return spring 6 is arranged between the slider 5 and the main pipeline 1. The bottom end of the slider 5 is connected to the top of the filter screen 4 through the sealing arc 7. The filter screen 4 is slidably connected to the shunt pipe 2. The sealing arc 7 is slidably connected to the shunt pipe 2, and the top surface of the sealing arc 7 is sealed to the bottom end of the slot.

[0035] Both ends of the sealing arc 7 are provided with chamfers.

[0036] The principles and beneficial effects of the above scheme are:

[0037] When the drilling fluid enters the shunt pipe 2 through the main pipeline 1, due to the existence of the water hammer effect, the drilling fluid will have an impact on the manifold and the valves inside it. The bottom end of the slider 5 is connected to the top of the filter screen 4 through the sealing arc 7, the filter screen 4 is slidably connected to the shunt pipe 2, the slider 5 is slidably connected to the notch, and the slider 5 is connected to the inner wall of the notch through the reset spring 6. When the drilling fluid flows into the shunt pipe 2, the drilling fluid impacts the filter screen 4, so that the filter screen 4 moves along the shunt pipe 2 toward the discharge pipe, the reset spring 6 is stretched, and the filter screen 4 buffers the drilling fluid and absorbs the impact force generated by the instantaneous injection of the drilling fluid into the shunt pipe 2. After the pressure of the drilling fluid is balanced, the reset spring 6 is reset under the action of its elastic force, thereby improving the service life of the manifold. At the same time, the setting of the reset spring 6 can reduce the vibration of the manifold when the drilling fluid is injected;

[0038] Since the cross section of the sealing arc 7 is set to an arc shape, the sealing arc 7 is slidably connected to the shunt pipe 2, and the top surface of the sealing arc 7 seals the bottom end of the slot, so the sealing arc 7 can maintain the sealing of the slot while the shunt pipe 2 slides, preventing the drilling fluid from leaking;

[0039] Since both ends of the sealing arc 7 are provided with chamfers, the sealing arc 7 can clean the local inner wall of the shunt tube 2 when the shunt tube 2 moves. At the same time, the chamfer setting can prevent the sealing arc 7 from being stuck by the sedimentation layer formed by solid particle impurities on the inner wall of the shunt tube 2.

[0040] A plurality of lifting rings 8 are provided on the top surface of the base plate.

[0041] The principles and beneficial effects of the above scheme are:

[0042] A plurality of lifting rings 8 are installed on the top surface of the bottom plate to facilitate the lifting and movement of the manifold and the bottom plate as a whole by heavy equipment.

[0043] The bottom of the base plate is provided with a plurality of legs 9 , the bottom surface of the legs 9 is provided with the bottom end of a screw hole, the top end of the screw hole is provided on the top surface of the base plate, the inner thread of the screw hole is connected with a positioning drill pipe 10 , and the conical bottom end of the positioning drill pipe 10 is arranged below the legs 9 .

[0044] The principles and beneficial effects of the above scheme are:

[0045] A plurality of legs 9 are installed at the bottom of the base plate, and the legs 9 can provide stable support for the base plate on the ground at the drilling site; the bottom end of the legs 9 is provided with a bottom end of a screw hole, and the top end of the screw hole is provided on the top surface of the base plate, and a positioning drill pipe 10 is threadedly connected in the screw hole, and the positioning drill pipe 10 is threadedly connected in the screw hole, so that the conical bottom end of the positioning drill pipe 10 is drilled into the ground at the drilling site, and after the drilling is completed, the fixing of the base plate is terminated, and the conical bottom end of the positioning drill pipe 10 is set to drill into the ground at the drilling site, thereby further improving the stability of the base plate after installation;

[0046] Since the screw hole and the positioning drill pipe 10 are connected by threads, the difficulty of drilling the positioning drill pipe 10 into the ground is reduced, and the positioning drill pipe 10 is easy to disassemble.

[0047] The side wall of the positioning drill pipe 10 is provided with a plurality of drainage openings, and the drainage openings are arranged below the bottom plate.

[0048] The principles and beneficial effects of the above scheme are:

[0049] When the water content on the ground at the drilling site is high, the water on the bottom surface can enter the interior of the positioning drill pipe 10 through multiple drainage holes opened on the side wall of the positioning drill pipe 10. The water in the positioning drill pipe 10 can be pumped out by a pumping device to reduce the water content and further improve the stability of the base plate installation.

[0050] The inner wall of the positioning drill pipe 10 is longitudinally provided with a plurality of reinforcing ribs 11 .

[0051] The principles and beneficial effects of the above scheme are:

[0052] A plurality of reinforcing ribs 11 are longitudinally mounted on the inner wall of the positioning drill pipe 10 , thereby improving the stability and strength of the overall structure of the positioning drill pipe 10 .

[0053] The shunt pipe 2 is provided with two spherical cavities 12, and a notch is arranged between the two spherical cavities 12. The two spherical cavities 12 are connected by a backwash pipe 13. The bottom wall of the spherical cavity 12 is rotatably connected to the bottom end of a ball valve 14. The ball valve 14 passes through the top of the spherical cavity 12 and is equipped with a connecting plate. The connecting plate is equipped with a rotating shaft. A guide hole 15 is opened through the ball valve 14. The guide hole 15 is coaxially arranged with the shunt pipe 2. The end of the backwash hole 16 is opened on the side of the ball valve 14. The end of the backwash hole 16 is arranged toward the inner wall of the shunt pipe 2, and the other end of the backwash hole 16 is connected to the guide hole 15. A driving rod 17 is installed on the top of the slider 5, and both ends of the driving rod 17 are rotatably connected to a rotating shaft.

[0054] A guide tube 18 is installed on the shunt tube 2, and the end of the guide tube 18 is arranged toward the reset spring 6, and the other end of the guide tube 18 is arranged toward the drain pipe. A second spherical cavity 19 is provided on the guide tube 18, and the bottom wall of the second spherical cavity 19 is rotatably connected to the bottom end of a second ball valve 20. An unlocking hole 21 is penetrated through the second ball valve 20, and the unlocking hole 21 is arranged parallel to the shunt tube 2. The unlocking shaft of the second ball valve 20 that passes through the top surface of the second spherical cavity 19 is equipped with a gear, and the gear is meshed and connected with a rack 22, and the rack 22 is connected to the top of the slider 5.

[0055] The principles and beneficial effects of the above scheme are:

[0056] When drilling fluid is injected into the shunt pipe 2, the drilling fluid causes a certain impact on the filter screen 4, causing the filter screen 4 to move a certain distance along the shunt pipe 2 toward the discharge pipe, and the driving rod 17 moves a certain distance toward the discharge pipe. The driving rod 17 drives the rotating shaft connected thereto to move a certain distance, and the rotating shaft drives the ball valve 14 to rotate counterclockwise by a certain angle. The backwash hole 16 on the ball valve 14 rotates counterclockwise by a certain angle, and the backwash hole 16 and the guide hole 15 supply drilling fluid to the shunt pipe 2 at the same time. The reset spring 6 is provided to prevent the driving rod 17 from moving too far, resulting in a change in the flow direction of the drilling fluid in the shunt pipe 2, so that the filter screen 4 is in a filtering state toward the side of the main pipeline 1;

[0057] After one side of the filter screen 4 has been filtered for a period of time, the solid particle impurities in the drilling fluid cause clogging of the filter screen 4, and the pressure inside the shunt pipe 2 between the filter screen 4 and the main pipeline increases instantaneously. The filter screen 4 drives the slider 5 and the sealing arc 7 to move significantly toward the discharge pipe, and the slider 5 drives the driving rod 17 to move, and the driving rod 17 drives the two rotating shafts connected to it to move, and the two rotating shafts respectively drive a ball valve 14 to rotate counterclockwise, and the backwash hole 16 on one ball valve 14 is connected to the shunt pipe 2, and supplies drilling fluid to the backwash pipe 13 through the guide hole 15 connected to it, and the drilling fluid passes through the other ball valve 14. The guide hole 15 supplies drilling fluid to the backwash hole 16 connected thereto, and outputs the drilling fluid to the other side of the filter screen 4 to backwash the filter screen 4. Since the pressure on the filter screen 4 increases instantaneously, the solid particle impurities that are blocked can be quickly removed; while the drilling fluid is backwashing the filter screen 4, the solid particle impurities that are blocked on the filter screen 4 can also be broken into primary solid particles, reducing their particle size to meet the particle size of the solid particle impurities in the drilling fluid for flushing the wellbore, thereby improving the practicality of the device during operation; the primary solid particles are taken away by the flow of the backwash drilling fluid to prevent them from clogging the filter screen 4 again;

[0058] At the same time, as the slider 5 moves toward the direction of the discharge pipe, the slider 5 drives the rack 22 at its top to move, and the rack 22 drives the gear meshing with it to rotate counterclockwise, and the gear drives the unlocking shaft and the unlocking hole 21 on the second ball valve 20 to rotate, so that the unlocking hole 21 is connected with the guide pipe 18, and the drilling fluid after backwashing enters the guide pipe 18 and enters the shunt pipe 2 through the other end of the guide pipe 18, so as to maintain the continuity of the drilling fluid supply;

[0059] After the drilling fluid backwashing, the filter screen 4, the slider 5 and the sealing arc 7 move rapidly toward the main pipeline 1 due to the removal of solid particle impurities, the impact of the drilling fluid backwashing and the elastic force of the reset spring 6. The slider 5 drives the driving rod 17 to reset, and the driving rod 17 drives the two rotating shafts connected to it to reset. The two rotating shafts respectively drive a ball valve 14 to rotate clockwise and reset. The guide holes 15 on the two ball valves 14 are connected to the shunt pipe 2 again. At the same time, the slider 5 drives the rack 22 to reset, and the rack 22 drives the second ball valve 20 to reset, and the unlocking hole 21 is closed to the guide pipe 18, which improves the ability of the device to work continuously, improves the automation effect of the device, and reduces the setting of the control device;

[0060] When the manifold is working in a high-temperature environment, the backwash pipe 13 and the guide pipe 18 increase the contact area between the shunt pipe 2 and the air. Therefore, the circulation of the drilling fluid through the shunt pipe 2, the backwash pipe 13 and the guide pipe 18 reduces the temperature of the drilling fluid, avoids the reduction of the fluidity of the drilling fluid, avoids the pressure drop of the drilling fluid during the supply process, and ensures that sufficient pressure can be provided for bottom hole cleaning; at the same time, it can prevent the substances in the drilling fluid from forming sediments after being exposed to high temperature or when there is a temperature difference between the wellbore and the bottom hole, thereby improving the cleaning effect of the wellbore.

[0061] The bottom wall of the guide tube 18 is rotatably connected to the bottom end of the crushing shaft 23 . The side wall of the crushing shaft 23 is equipped with a plurality of paddles 24 . The paddles 24 are placed in the guide tube 18 . The top end of the crushing shaft 23 passes through the outside of the guide tube 18 .

[0062] The principles and beneficial effects of the above scheme are:

[0063] When the guide pipe 18 guides the backwash drilling fluid, the backwash drilling fluid flows on the crushing shaft 23 to drive the blades 24 to rotate. The rotation of the blades 24 can break the primary solid particles in the backwash drilling fluid into secondary solid particles, further reducing their particle size, thereby improving the adaptability and adjustment ability of the device to the supply of drilling fluids of different qualities, and also increasing the flushing effect on the wellbore.

[0064] The guide tube 18 is provided with a crushing chamber 25, and the inner wall of the crushing chamber 25 facing the end of the guide tube 18 is coplanar with one end of the second filter screen 26. The other end of the second filter screen 26 is placed in the guide tube 18. The filter screen 4 is provided with a plurality of filter holes, and the second filter screen 26 is provided with a plurality of second filter holes, and the diameter of the filter holes is larger than the diameter of the second filter holes.

[0065] The principles and beneficial effects of the above scheme are:

[0066] By installing the second filter screen 26 in the guide pipe 18 , the second filter holes on the second filter screen 26 are smaller than the diameter of the filter holes, so that the primary solid particles remaining in the drilling fluid can be collected by the second filter screen 26 .

[0067] A crushing plate 27 and an auxiliary crushing plate 31 are slidably connected in the crushing chamber 25, a plurality of pressure relief holes 28 are opened on the crushing plate 27, the crushing plate 27 and the guide tube 18 are staggered, one side of the crushing plate 27 is connected to the inner wall of one end of the crushing chamber 25 through a second return spring 29, the other side of the crushing plate 27 is provided with an inclined surface 30, and the inclined surface 30 is arranged toward the diverter pipe 2, the auxiliary crushing plate 31 and the guide tube 18 are staggered, one side of the auxiliary crushing plate 31 is connected to the inner wall of the other end of the crushing chamber 25 through a third return spring 32, the other side of the auxiliary crushing plate 31 is provided with a second inclined surface, the second inclined surface is in contact with the inclined surface 30, a second notch is opened on the crushing chamber 25, the crushing plate 27 and the second notch are slidably sealed, a moving rod 33 is installed at the top of the crushing plate 27, and the moving rod 33 is connected to the auxiliary driving mechanism 34.

[0068] The principles and beneficial effects of the above scheme are:

[0069] When residual primary solid particles remain on the second filter screen 26, the moving rod 33 is driven to reciprocate in the second notch, and the moving rod 33 cooperates with the second return spring 29 to drive the crushing plate 27 to reciprocate, grinding and crushing the primary solid particles on the second filter screen 26, and at the same time, the primary solid particles are discharged into the shunt pipe 2 connected to the other end of the guide pipe 18 through the flow of backwash drilling fluid;

[0070] Since the flow of the backwash drilling fluid is affected by the movement of the crushing plate 27, the direction of the backwash drilling fluid changes near the second filter screen 26. The change in the direction of the fluid causes some primary solid particles to be driven by the flow of the backwash drilling fluid to the inclined surface 30 of the crushing plate 27, and are pushed to the second inclined surface of the auxiliary crushing plate 31 through the inclined surface 30, and the primary solid particles are crushed by the extrusion of the second inclined surface and the inclined surface 30; since the auxiliary crushing plate 31 is connected to the end wall of the crushing chamber 25 through the third return spring 32, the auxiliary crushing plate 31 itself will vibrate after the second inclined surface contacts the inclined surface 30, and the vibration of the auxiliary crushing plate 31 will further destroy another part of the primary solid particles; at the same time, the utilization efficiency of the components in the device is fully improved;

[0071] Since the crushing plate 27 is provided with a plurality of pressure relief holes 28, it can ensure that the pressure in the guide pipe 18 is constant when the device is crushing primary solid particles, thereby avoiding the pressure increase in the part of the guide pipe 18 or in the crushing chamber 25, improving the safety of the device, and at the same time avoiding the crushing plate 27 from being stuck due to the pressure of the backwash drilling fluid on the crushing plate 27;

[0072] Due to the change in the direction of the backwash drilling fluid near the second filter screen 26 and the vibration generated by the reciprocating movement of the crushing plate 27, the residual solid particles in the pressure relief hole 28 and the second filter hole can be cleaned, thereby improving the cleanliness of the device, reducing the maintenance difficulty of the device, and reducing the number of device maintenance times.

[0073] The auxiliary driving mechanism 34 includes: a second rack 35, an auxiliary shaft 36, a bevel gear 37, a second bevel gear 38 and a special-shaped tooth 39. The top end of the crushing shaft 23 that passes through the guide tube 18 is equipped with a second bevel gear 38, and the second bevel gear 38 is meshed with the bevel gear 37. The bevel gear 37 and the special-shaped tooth 39 are installed on the auxiliary shaft 36. The auxiliary shaft 36 is rotatably connected to the crushing chamber 25. The side wall of the special-shaped tooth 39 equipped with the gear is meshed with the second rack 35. The second rack 35 is slidably connected to the crushing chamber 25, and the end of the second rack 35 is connected to the moving rod 33.

[0074] The principles and beneficial effects of the above scheme are:

[0075] When the crushing shaft 23 rotates, the crushing shaft 23 drives the second bevel gear 38 to rotate, the second bevel gear 38 drives the bevel gear 37 meshing with it to rotate, the bevel gear 37 drives the auxiliary shaft 36 to rotate, the special-shaped teeth 39 on the auxiliary shaft 36 are intermittently meshed with the second rack 35, and the second rack 35, the moving rod 33 and the crushing plate 27 realize reciprocating motion under the cooperation of the second return spring 29, which fully utilizes the kinetic energy generated when the backwash drilling fluid flows, reduces the setting of the power device, and simplifies the design of the mechanism;

[0076] Since the second rack 35 is slidably connected to the pulverizing chamber 25 , the stability of the second rack 35 during reciprocating motion is improved.

[0077] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A drilling fluid filtration manifold, characterized in that: include: A main pipeline (1), a shunt pipe (2), a telescopic mechanism (3) and a filter (4), wherein the main pipeline (1) is connected to one end of the shunt pipe (2), the end of the main pipeline (1) is connected to a pump station, the main pipeline (1) and the shunt pipe (2) are both mounted on a bottom plate, the other end of the shunt pipe (2) is connected to a drain pipe, the shunt pipe (2) is provided with a telescopic mechanism (3), the telescopic mechanism (3) is connected to the filter (4), and the filter (4) is arranged in the shunt pipe (2); The telescopic mechanism (3) comprises: a slider (5), a return spring (6) and a sealing arc (7); a slot is formed on the diverter pipe (2); the slider (5) is slidably connected in the slot; the end of the slider (5) is connected to the inner wall of the slot via the return spring (6); the return spring (6) is arranged between the slider (5) and the main pipe (1); the bottom end of the slider (5) is connected to the top end of the filter screen (4) via the sealing arc (7); the filter screen (4) is slidably connected to the diverter pipe (2); the sealing arc (7) is slidably connected to the diverter pipe (2); the top surface of the sealing arc (7) is sealed against the bottom end of the slot; The diverter pipe (2) is provided with two spherical cavities (12), a notch is arranged between the two spherical cavities (12), the two spherical cavities (12) are connected by a backwash pipe (13), the bottom wall of the spherical cavity (12) is rotatably connected to the bottom end of a ball valve (14), the ball valve (14) is passed through to the top of the spherical cavity (12) and a connecting plate is installed, the connecting plate is equipped with a rotating shaft, a guide hole (15) is opened through the ball valve (14), the guide hole (15) is coaxially arranged with the diverter pipe (2), the end of the backwash hole (16) is opened on the side of the ball valve (14), the end of the backwash hole (16) is arranged toward the inner wall of the diverter pipe (2), the other end of the backwash hole (16) is connected to the guide hole (15), a driving rod (17) is installed at the top of the slider (5), and the two ends of the driving rod (17) are respectively rotatably connected to a rotating shaft; The shunt pipe (2) is provided with a guide pipe (18), the end of the guide pipe (18) is arranged toward the reset spring (6), and the other end of the guide pipe (18) is arranged toward the discharge pipe. The guide pipe (18) is provided with a second spherical cavity (19), the bottom wall of the second spherical cavity (19) is rotatably connected to the bottom end of a second ball valve (20), an unlocking hole (21) is penetrated through the second ball valve (20), the unlocking hole (21) is arranged parallel to the shunt pipe (2), and an unlocking shaft of the second ball valve (20) extending from the top surface of the second spherical cavity (19) is provided with a gear, the gear is meshed with a rack (22), and the rack (22) is connected to the top end of the slider (5).

2. A drilling fluid filtration manifold according to claim 1, characterized in that: Both ends of the sealing arc (7) are provided with chamfers.

3. The drilling fluid filtration manifold according to claim 1, characterized in that: The top surface of the base plate is provided with a plurality of lifting rings (8).

4. A drilling fluid filtration manifold according to claim 3, characterized in that: The bottom of the base plate is provided with a plurality of supporting feet (9), the bottom surface of the supporting feet (9) is provided with the bottom end of a screw hole, the top end of the screw hole is provided on the top surface of the base plate, a positioning drill pipe (10) is threadedly connected to the inner thread of the screw hole, and the conical bottom end of the positioning drill pipe (10) is arranged below the supporting feet (9).

5. A drilling fluid filtration manifold according to claim 4, characterized in that: The side wall of the positioning drill pipe (10) is provided with a plurality of drainage openings, and the drainage openings are arranged below the bottom plate.

6. A drilling fluid filtration manifold according to claim 5, characterized in that: The inner wall of the positioning drill pipe (10) is longitudinally provided with a plurality of reinforcing ribs (11).

7. The drilling fluid filtration manifold according to claim 1, characterized in that: The bottom wall of the guide tube (18) is rotatably connected to the bottom end of the crushing shaft (23); a plurality of paddles (24) are mounted on the side wall of the crushing shaft (23); the paddles (24) are disposed in the guide tube (18); and the top end of the crushing shaft (23) extends out of the guide tube (18).

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