A screening and filtering device for waste drilling fluid in oil fields

Abstract

The invention discloses a screening and filtering device for waste drilling fluid in an oil field, and relates to the technical field of waste drilling fluid treatment. The device comprises a stirring cylinder, wherein a driving component is fixedly connected to the top of the stirring cylinder, a stirring blade is fixedly connected to the output shaft end of the driving component, the bottom end of the stirring blade is located inside the stirring cylinder, a liquid inlet bucket is fixedly connected to the top of the stirring cylinder, the liquid inlet bucket is communicated with the inside of the stirring cylinder, an auxiliary screening mechanism for intercepting large-grained impurities in the waste drilling fluid to prevent the stirring blade from being worn is arranged inside the liquid inlet bucket, the auxiliary screening mechanism comprises a fixed ring rotatably connected to the inner wall of an opening at the bottom of the liquid inlet bucket, a lifting rod is slidably connected through the inner wall of the fixed ring, and compared with the prior art, the clogging of the filter screen can be reduced, and the processing efficiency can be avoided. At the same time, frequent maintenance and replacement of the filter screen are not required, and the use cost is reduced, and large-grained impurities can be avoided from entering, rubbing against the stirring blade, and accelerating the wear thereof.

Description

Technical Field

[0001] The invention relates to the technical field of waste drilling fluid treatment, in particular to a screening and filtering device for waste drilling fluid in an oil field. Background Art

[0002] Waste drilling fluid treatment refers to the treatment of waste drilling fluid generated during oil and gas drilling to reduce its impact on the environment. Waste drilling fluid usually contains a variety of chemicals, such as heavy metals, organic compounds and solid particles. If not properly handled, it may cause pollution to the soil, water bodies and ecosystems.

[0003] However, the prior art still has the following defects when used in practice: for the screening treatment of waste drilling fluid, the commonly used equipment is a mixing tank. Since the waste drilling fluid contains solid particles, it is necessary to perform preliminary filtration before the waste drilling fluid enters the mixing tank. The existing mixing tank will be equipped with a filter for filtration, but the solid particles in the waste drilling fluid will accelerate the clogging of the screen or filter medium, affecting the processing efficiency, and even requiring frequent maintenance and replacement of the filter medium. In addition, the solid particles directly enter the mixing tank and will generate friction with the mixing blades, thereby accelerating the wear of the mixing blades and affecting the service life of the equipment.

[0004] In view of this, the present invention proposes an oilfield waste drilling fluid screening and filtering device to make up for and improve the deficiencies of the prior art. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an oilfield waste drilling fluid screening and filtering device to solve the technical problems raised in the above background technology.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a screening and filtering device for waste drilling fluid in an oil field, comprising a stirring cylinder, a driving component is fixedly connected to the top of the stirring cylinder, a stirring blade is fixedly connected to the output shaft end of the driving component, the bottom end of the stirring blade is located inside the stirring cylinder, a liquid inlet hopper is fixedly connected to the top of the stirring cylinder, the liquid inlet hopper is connected to the inside of the stirring cylinder, and an auxiliary screening mechanism is arranged inside the liquid inlet hopper for intercepting large particles of impurities in the waste drilling fluid to prevent wear of the stirring blade.

[0007] As a further improvement of the above scheme, the auxiliary screening mechanism includes a fixed ring rotatably connected to the inner wall of the bottom opening of the liquid inlet bucket, a lifting rod is slidably connected through the inner wall of the fixed ring, a screening cylinder is fixedly connected to the top of the lifting rod, the screening cylinder is rotatably matched with the inner wall of the top opening of the liquid inlet bucket, a first gear ring is fixedly connected to the bottom of the lifting rod, a support rod is fixedly connected to the inner wall of the bottom opening of the screening cylinder, a universal ball is inserted into the inner wall in the middle of the support rod, and a filter cover is fixedly connected to the bottom of the universal ball and below the support rod.

[0008] As a further improvement of the above solution, the cross-sectional profile of the filter cover is in the shape of a truncated cone, and the filter cover is narrow at the top and wide at the bottom.

[0009] As a further improvement of the above scheme, a support ring is fixedly connected to the inner wall of the top of the mixing cylinder and is located below the opening of the liquid inlet hopper. A fixed cylinder is fixedly connected inside the support ring. A filter bag is fixedly connected to the inner wall of the fixed cylinder. The filter bag is located directly below the bottom opening of the liquid inlet hopper. A screening rod is fixedly connected to the inner wall of the first gear ring, and the bottom end of the screening rod is located on the surface of the filter bag.

[0010] As a further improvement of the above scheme, a second tooth ring is fixedly connected to the outer wall of the bottom end of the stirring blade, and the second tooth ring is meshingly matched with the first tooth ring. A support rod is fixedly connected to the bottom of the second tooth ring away from the stirring blade, and a support block is fixedly connected to the bottom of the first tooth ring, and the support rod and the support block are in abutment with each other.

[0011] As a further improvement of the above scheme, a screen tube is fixedly connected to the top of the mixing cylinder and located on the outside of the bottom end of the liquid inlet bucket. The end of the screen tube close to the liquid inlet bucket is connected to the interior of the liquid inlet bucket, and the end of the screen tube away from the liquid inlet bucket is fixedly connected to the outer wall of the mixing cylinder. The end of the screen tube away from the liquid inlet bucket is also connected to the interior of the mixing cylinder. A fine filter mesh is fixedly connected to the corner of the screen tube away from the liquid inlet bucket.

[0012] As a further improvement of the above scheme, an auxiliary dosing mechanism is also provided inside the mixing cylinder, and the auxiliary dosing mechanism includes a dosing cartridge fixedly connected to the top of the mixing cylinder, and the bottom inner wall of the dosing cartridge is rotatably connected to a drug discharging sleeve, and the bottom end of the drug discharging sleeve is arranged to penetrate the top inner wall of the rotating mixing cylinder, and the dosing cartridge is connected to the inside of the drug discharging sleeve, and the bottom of the drug discharging sleeve is symmetrically fixedly connected to two vertical rods, and a sealing ball is hinged between the inner walls of the bottom ends of the two vertical rods, and a torsion spring is sleeved inside the hinge of the sealing ball, and the top contour of the sealing ball is consistent with the bottom contour of the drug discharging sleeve, and the bottom of the sealing ball is fixedly connected to an arc plate.

[0013] As a further improvement of the above solution, a swing rod is fixedly connected to the bottom of the second gear ring, and the arc-shaped end of the swing rod away from the stirring blade is in abutment with the outer wall of the arc plate.

[0014] As a further improvement of the above scheme, a mixing blade is fixedly connected to the top of the medicine discharging sleeve, and the mixing blade is located inside the medicine adding sleeve. A third tooth ring is fixedly connected to the outer wall of the bottom end of the medicine discharging sleeve, and the third tooth ring is meshed with the second tooth ring.

[0015] As a further improvement of the above solution, three mixing leaves are evenly and fixedly connected to the top of the medicine discharging sleeve, and the heights of the three mixing leaves are all greater than the height of the medicine discharging sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) the filter cover can be used to perform preliminary filtering of the waste drilling fluid, and at the same time, the filter cover is in the shape of a truncated cone, so that larger particles intercepted in the waste drilling fluid, such as rock fragments and wood blocks, can slide down from high to low along the outer contour of the filter cover to the bottom area of ​​the liquid inlet bucket, and the bottom diameter of the liquid inlet bucket is smaller than the top diameter. The larger inclination of the inner contour is used to increase the sliding speed of the larger particles, so that they can slide quickly into the inside of the screen tube, which is convenient for collection and avoids the accumulation of larger particles in the bottom area of ​​the liquid inlet bucket.

[0017] Among them, the stirring blade is used to drive the second gear ring to rotate synchronously, and the second gear ring is meshed with the first gear ring, so that the first gear ring can rotate synchronously, and the first gear ring drives the lifting rod and the fixed ring to rotate on the inner wall of the bottom of the liquid inlet bucket, so that the filter cover can rotate synchronously. The rotation generates centrifugal force, and the larger particles can be separated from the surface of the filter cover by their own gravity, thereby reducing the occurrence of blockage, improving the permeability of the filter cover, and thus enhancing the filtering effect of the filter cover.

[0018] Finally, through the contact between the support rod and the support block, the support rod will have a lifting effect on the support block, so that the first gear ring lifts the lifting rod to rise the height on the inner wall of the fixed ring. Through intermittent lifting, the first gear ring will reset under the action of gravity, so that the stability of use is improved. The oscillation effect produced by the lifting rod to lift the screening cylinder is conducive to unblocking the inside of the screening cylinder and avoiding blockage during the input of waste drilling fluid, thereby improving the passing performance of the screening cylinder. As the support rod and the screening cylinder are lifted synchronously, the universal ball will shake on the top of the support rod, and the universal ball is fixedly connected to the filter cover, which can achieve the purpose of multi-directional shaking of the filter cover and shake off larger particles adhering to the surface, thereby ensuring the clean effect of the filter cover. Compared with the existing technology, it can reduce the blockage of the filter screen and avoid affecting the processing efficiency. At the same time, there is no need for frequent maintenance and replacement of the filter screen, which reduces the cost of use and avoids the entry of large particles of impurities, friction with the stirring blades, and accelerated wear thereof.

[0019] (2) The filter bag can be used to perform secondary filtration on the waste drilling fluid after the initial filtration. The use of a denser mesh allows the finer particles and suspended matter in the waste drilling fluid to be intercepted, which is beneficial to better separation of solids and liquids in the waste drilling fluid. The first gear ring is used to rotate the sieve rod, so that the bottom end of the sieve rod makes a circular motion on the surface of the filter bag, which can disperse the fine particles and suspended matter on the surface of the filter bag and prevent the finer particles and suspended matter from agglomerating on the surface of the filter bag. The uniform distribution is conducive to the separation of solids and liquids, and at the same time, it prevents particles and suspended matter from affecting the normal filtration of the filter bag. In addition, the filter bag is detachable and can be replaced after a period of use. At the same time, it is convenient to uniformly handle the collected fine particles and suspended matter.

[0020] (3) By flipping the plugging ball between the two vertical poles, the plugging ball is separated from the drug outlet sleeve and a gap is generated, so that the bottom opening of the drug outlet sleeve can be converted from a closed state to an open state, so that the chemical agent stored in the drug adding cartridge flows out through the gap and is mixed into the filtered waste drilling fluid. Combined with the continuous stirring of the stirring blade, the chemical agent can be fully mixed with the waste drilling fluid, which is beneficial to improving the treatment effect of the waste drilling fluid. When the arc plate and the plugging ball are reset, the bottom opening of the drug outlet sleeve is re-sealed, so that the chemical agent no longer flows out. By utilizing the time interval between the opening and closing of the bottom opening of the drug outlet sleeve, a cyclic dosing method is adopted to reduce the amount of chemical agent added at a single time, making the amount of chemical agent added more scientific, reducing costs, and avoiding the introduction of new environmental problems, such as chemical agent residues and emissions.

[0021] Finally, the mixing blades rotate inside the dosing cylinder to stir the chemicals inside the dosing cylinder, avoiding local solidification of the chemicals, improving the fluidity of the chemicals, and facilitating the chemicals to flow smoothly into the mixing cylinder and mix with the waste drilling fluid.

[0022] (4) The large particles can be intercepted again by the fine filter mesh, so that the large particles are retained in the top area of ​​the screen tube, which is convenient for the staff to salvage and collect. The small amount of waste drilling fluid that flows into the screen tube is filtered and then flows back into the mixing tank. This can help the screen cylinder and the liquid inlet bucket share the flow of waste drilling fluid input, improve the stability of waste drilling fluid input, and at the same time improve the screening efficiency of waste drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is an internal cross-sectional view of the overall structure of the present invention.

[0025] Figure 3It is a schematic diagram of the three-dimensional structure of the auxiliary screening mechanism of the present invention.

[0026] Figure 4 It is a sectional view of the three-dimensional structure of the auxiliary screening mechanism of the present invention.

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the relevant components of the screening rod of the present invention.

[0028] Figure 6 It is a bottom view schematic diagram of the three-dimensional structure of the related components of the first gear ring of the present invention.

[0029] Figure 7 It is a sectional view of the three-dimensional structure of the auxiliary medicine adding mechanism of the present invention.

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the auxiliary dosing mechanism of the present invention.

[0031] The numbers in the figure are: 1, mixing cylinder; 2, driving component; 3, mixing blade; 301, liquid inlet bucket; 401, fixed ring; 402, lifting rod; 403, screening cylinder; 404, first gear ring; 405, support rod; 406, universal ball; 407, filter cover; 501, support sleeve; 502, fixed cylinder; 503, filter bag; 504, screening rod; 601, second gear ring; 602, support rod; 603, support block; 701, screening tube; 702, filter fine mesh; 801, drug adding cylinder; 802, drug discharging sleeve; 803, vertical rod; 804, blocking sphere; 805, arc plate; 806, swing rod; 901, mixing blade; 902, third gear ring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiments of the present invention: Please refer to Figures 1 to 8 As shown, a device for screening and filtering waste drilling fluid in an oil field comprises a stirring cylinder 1, a driving component 2 is fixedly connected to the top of the stirring cylinder 1, a stirring blade 3 is fixedly connected to the output shaft end of the driving component 2, the bottom end of the stirring blade 3 is located inside the stirring cylinder 1, a liquid inlet hopper 301 is fixedly connected to the top of the stirring cylinder 1, the liquid inlet hopper 301 is communicated with the inside of the stirring cylinder 1, and an auxiliary screening mechanism is arranged inside the liquid inlet hopper 301 for intercepting large particles of impurities in the waste drilling fluid to prevent the stirring blade 3 from being worn.

[0034] The auxiliary screening mechanism includes a fixed ring 401 rotatably connected to the inner wall of the bottom opening of the liquid inlet bucket 301, a lifting rod 402 is slidably connected to the inner wall of the fixed ring 401, a screening cylinder 403 is fixedly connected to the top of the lifting rod 402, the screening cylinder 403 is rotatably matched with the inner wall of the top opening of the liquid inlet bucket 301, a first gear ring 404 is fixedly connected to the bottom of the lifting rod 402, a support rod 405 is fixedly connected to the inner wall of the bottom opening of the screening cylinder 403, a universal ball 406 is inserted into the inner wall in the middle of the support rod 405, a filter cover 407 is fixedly connected to the bottom of the universal ball 406 and below the support rod 405, the cross-sectional contour shape of the filter cover 407 is a truncated cone, and the filter cover 407 is narrow at the top and wide at the bottom.

[0035] The filter cover 407 can be used to filter the waste drilling fluid initially, and the filter cover 407 is in the shape of a truncated cone, and is narrow at the top and wide at the bottom, so that the larger particles intercepted in the waste drilling fluid, such as rock fragments and wood blocks, can slide down from high to low along the outer contour of the filter cover 407 to the bottom of the liquid inlet bucket 301, and the bottom diameter of the liquid inlet bucket 301 is smaller than the top diameter. The larger inclination of the inner contour increases the sliding speed of the larger particles, which can quickly slide into the inside of the screening tube 701, which is convenient for collection and avoids the accumulation of larger particles in the bottom area of ​​the liquid inlet bucket 301. The screening cylinder is lifted by the lifting rod 402 403, the oscillation effect produced is conducive to clearing the inside of the screening cylinder 403, avoiding blockage during the input of waste drilling fluid, and improving the passing performance of the screening cylinder 403. As the support rod 405 and the screening cylinder 403 are lifted synchronously, the universal ball 406 will shake on the top of the support rod 405, and the universal ball 406 is fixedly connected to the filter cover 407, which can achieve the purpose of multi-directional shaking of the filter cover 407, and can shake off larger particles adhering to the surface, thereby ensuring the cleaning effect of the filter cover 407. Compared with the existing technology, it can reduce the blockage of the filter screen and avoid affecting the processing efficiency. At the same time, there is no need for frequent maintenance and replacement of the filter screen, thereby reducing the cost of use.

[0036] Preferably, a support ring 501 is fixedly connected to the inner wall of the top of the mixing tank 1 and is located below the opening of the liquid inlet hopper 301, a fixed cylinder 502 is fixedly connected inside the support ring 501, a filter bag 503 is fixedly connected to the inner wall of the fixed cylinder 502, the filter bag 503 is located directly below the bottom opening of the liquid inlet hopper 301, and a sieve rod 504 is fixedly connected to the inner wall of the first gear ring 404, and the bottom end of the sieve rod 504 is located on the surface of the filter bag 503.

[0037] Preferably, a second toothed ring 601 is fixedly connected to the outer wall of the bottom end of the stirring blade 3, and the second toothed ring 601 is meshed with the first toothed ring 404. A support rod 602 is fixedly connected to the bottom of the second toothed ring 601 away from the stirring blade 3, and a support block 603 is fixedly connected to the bottom of the first toothed ring 404, and the support rod 602 and the support block 603 are in contact with each other. A sieve tube 701 is fixedly connected to the top of the mixing cylinder 1 and located on the outside of the bottom end of the liquid inlet bucket 301. One end of the sieve tube 701 close to the liquid inlet bucket 301 is connected to the interior of the liquid inlet bucket 301, and one end of the sieve tube 701 away from the liquid inlet bucket 301 is fixedly connected to the outer wall of the mixing cylinder 1, and one end of the sieve tube 701 away from the liquid inlet bucket 301 is also connected to the interior of the mixing cylinder 1. A fine filter mesh 702 is fixedly connected to the corner of the sieve tube 701 away from the liquid inlet bucket 301.

[0038] Among them, the large particles can be intercepted again by the filter mesh 702, so that the large particles are retained in the top area of ​​the screen tube 701, which is convenient for the staff to salvage and collect. Through the interception of the filter mesh 702, a small amount of waste drilling fluid flowing into the screen tube 701 is filtered and then flows back into the mixing tank 1, which can help the screen cylinder 403 and the liquid inlet hopper 301 share the flow rate of the waste drilling fluid input, improve the stability of the waste drilling fluid input, and at the same time improve the screening efficiency of the waste drilling fluid.

[0039] Preferably, an auxiliary dosing mechanism is also provided inside the mixing cylinder 1, and the auxiliary dosing mechanism includes a dosing cartridge 801 fixedly connected to the top of the mixing cylinder 1, and a medicine discharging sleeve 802 is rotatably connected to the inner wall of the bottom of the dosing cartridge 801, and the bottom end of the medicine discharging sleeve 802 is arranged to penetrate the inner wall of the top of the rotating mixing cylinder 1, and the dosing cartridge 801 is connected to the inside of the medicine discharging sleeve 802, and the bottom of the medicine discharging sleeve 802 is symmetrically fixedly connected with two vertical rods 803, and a blocking ball 804 is hinged between the inner walls of the bottom ends of the two vertical rods 803, and a torsion spring is sleeved inside the hinge of the blocking ball 804, and the top contour of the blocking ball 804 is consistent with the bottom contour of the medicine discharging sleeve 802 The sealing sphere 804 is matched, and an arc plate 805 is fixedly connected to the bottom of the sealing sphere 804. A swing rod 806 is fixedly connected to the bottom of the second tooth ring 601. The arc-shaped end of the swing rod 806 away from the stirring blade 3 is in contact with the outer wall of the arc plate 805. A mixing leaf 901 is fixedly connected to the top of the medicine discharging sleeve 802. The mixing leaf 901 is located inside the medicine adding sleeve 801. A third tooth ring 902 is fixedly connected to the outer wall of the bottom end of the medicine discharging sleeve 802. The third tooth ring 902 is meshed with the second tooth ring 601. Three mixing leaves 901 are evenly fixedly connected to the top of the medicine discharging sleeve 802, and the heights of the three mixing leaves 901 are all greater than the height of the medicine discharging sleeve 802.

[0040] Among them, the blocking ball 804 is flipped between the two vertical rods 803 to separate the blocking ball 804 from the medicine discharging sleeve 802 and generate a gap, so that the bottom opening of the medicine discharging sleeve 802 can be converted from a closed state to an open state, so that the chemical agents stored in the medicine adding cartridge 801 can flow out through the gap and be mixed into the filtered waste drilling fluid. With the continuous stirring of the stirring blade 3, the chemical agents can be fully mixed with the waste drilling fluid. When the swing rod 806 does not conflict with the arc plate 805, the arc plate 805 and the blocking ball 804 are reset under the rebound action of the torsion spring, and the bottom opening of the medicine discharging sleeve 802 is re-sealed, so that the chemical agents no longer flow out. By utilizing the time interval between the opening and closing of the bottom opening of the medicine discharging sleeve 802 and adopting a cyclic dosing method, the single chemical dosage can be reduced, making the chemical dosage more scientific, reducing costs, and avoiding the introduction of new environmental problems, such as chemical residues and emissions.

[0041] The following are the complete usage steps and working principles of the above embodiment: in the initial state, the second tooth ring 601 is in a meshing state with the first tooth ring 404 and the third tooth ring 902, the support rod 602 and the support block 603 are in a non-contact state, the rocker arm 806 and the arc plate 805 are in a non-contact state, and the bottom opening of the medicine outlet sleeve 802 is in a blocked state by the blocking ball 804.

[0042] When the device is in use, the staff connects the pipeline for conveying the waste drilling fluid with the screening cylinder 403, so that the waste drilling fluid to be filtered can flow into the mixing cylinder 1 through the screening cylinder 403, and uses the control panel to start the driving component 2, so that the driving component 2 rotates with the stirring blade 3, thereby stirring the waste drilling fluid in the mixing cylinder 1. When the waste drilling fluid enters the screening cylinder 403, it first falls on the surface of the filter cover 407, and the filter cover 407 can be used to perform a preliminary filtering effect on the waste drilling fluid. At the same time, the filter cover 407 is in the shape of a truncated cone, and is narrow at the top and wide at the bottom. The bottom height of the filter cover 407 is higher than the bottom area of ​​the liquid inlet bucket 301, so that larger particles intercepted in the waste drilling fluid, such as rock fragments and wood blocks, can flow through the filter cover 407. When the outer contour of the filter cover 407 slides from high to low to the bottom area of ​​the liquid inlet bucket 301, and the bottom diameter of the liquid inlet bucket 301 is smaller than the top diameter, the larger inclination of the inner contour is used to increase the sliding speed of larger particles, so that they can quickly slide into the inside of the sieve tube 701, which is convenient for collection and avoids the accumulation of larger particles in the bottom area of ​​the liquid inlet bucket 301. The stirring blade 3 is used to drive the second gear ring 601 to rotate synchronously, and the second gear ring 601 is meshed with the first gear ring 404, so that the first gear ring 404 can rotate synchronously. The first gear ring 404 drives the lifting rod 402 and the fixing ring 401 to rotate on the inner wall of the bottom of the liquid inlet bucket 301, so that the filter cover 407 can rotate synchronously. Since the rotation generates centrifugal force, the second gear ring 601 is meshed with the first gear ring 404, so that the first gear ring 404 can rotate synchronously. The gravity of the larger particles on the filter cover 407 allows the larger particles to break away from the surface of the filter cover 407, reducing the occurrence of clogging, improving the permeability of the filter cover 407, and further enhancing the filtering effect of the filter cover 407. When the second gear ring 601 rotates with the support rod 602, the end of the support rod 602 away from the second gear ring 601 will collide with the bottom of the support block 603. Since multiple support blocks 603 are arranged at the bottom of the first gear ring 404, and there is a height difference between the multiple support blocks 603 and the bottom of the first gear ring 404, and both ends of the multiple support blocks 603 are arc-shaped surfaces, after the support rod 602 successfully collide with the support block 603, the support rod 602 will lift the support block 603, thereby causing the first gear ring 404 to lift the lifting rod. 402 rises on the inner wall of the fixed ring 401 through intermittent lifting, and the first gear ring 404 will reset under the action of gravity, so that the stability of use is improved, and the sieving cylinder 403 is lifted by the lifting rod 402, and the oscillation effect generated is conducive to dredging the inside of the sieving cylinder 403, avoiding blockage during the input of waste drilling fluid, and improving the passing performance of the sieving cylinder 403. With the synchronous lifting of the support rod 405 and the sieving cylinder 403, the universal ball 406 will shake significantly on the top of the support rod 405, and the universal ball 406 is fixedly connected to the filter cover 407, so that the filter cover 407 can be shaken in multiple directions and large particles adhering to the surface can be shaken off. At the same time, the waste drilling fluid impacts the filter cover 407 from top to bottom,The filter cover 407 will also affect the dynamics of the universal ball 406, so that the filter cover 407 can shake continuously and significantly, thereby ensuring the cleaning effect of the filter cover 407. Compared with the existing technology, it can reduce the clogging of the filter screen and avoid affecting the processing efficiency. At the same time, it does not require frequent maintenance and replacement of the filter screen, thereby reducing the cost of use.

[0043] When the waste drilling fluid that has been initially filtered by the filter cover 407 falls vertically onto the surface of the filter bag 503 under the action of gravity, the filter bag 503 can be used to perform secondary filtration on the waste drilling fluid that has been initially filtered. A denser mesh is used to intercept finer particles and suspended matter in the waste drilling fluid, which is beneficial to better separation of solids and liquids in the waste drilling fluid. As finer particles and suspended matter accumulate on the surface of the filter bag 503, the first gear ring 404 is used to rotate the separation sieve rod 504, so that the separation The bottom end of the sieve rod 504 makes a circular motion on the surface of the filter bag 503, which can disperse the fine particles and suspended matter on the surface of the filter bag 503, prevent even finer particles and suspended matter from agglomerating on the surface of the filter bag 503, and make the distribution uniform, which is helpful for separating solids from liquids, and prevents particles and suspended matter from affecting the normal filtration of the filter bag 503. In addition, the filter bag 503 is detachable and can be replaced after a period of use, and it is also convenient for unified treatment of the collected fine particles and suspended matter.

[0044] In addition, since the bottom of the liquid inlet hopper 301 is connected to the screening tube 701, the large particles intercepted by the filter cover 407 will fall into the screen tube 701. At the same time, a small amount of waste drilling fluid will flow into the screen tube 701, which can push the large particles in the screen tube 701 and make the large particles flow to the side of the filter mesh 702 to avoid blockage in the area below the liquid inlet hopper 301. The large particles can be intercepted again by the filter mesh 702, so that the large particles are left in the top area of ​​the screen tube 701, which is convenient for the staff to salvage and collect. The interception of the filter mesh 702 allows a small amount of waste drilling fluid that flows into the screen tube 701 to flow back into the mixing tank 1 after filtration, which can help the screening cylinder 403 and the liquid inlet hopper 301 share the flow of waste drilling fluid input, improve the stability of waste drilling fluid input, and improve the screening efficiency of waste drilling fluid.

[0045] In order to improve the treatment efficiency of the waste drilling fluid after filtration, chemical agents are selected to react with the waste drilling fluid. The chemical agents are usually flocculants, precipitants, and oxidants. The chemical agents are pre-added into the dosing cartridge 801, and then the second gear ring 601 is used to rotate the rocker 806. Each rotation will conflict with the arc plate 805, so that the arc plate 805 will flip in the pushing direction after being pushed by the arc end of the rocker 806, and at the same time squeeze the torsion spring inside the hinge. Since the top of the blocking ball 804 is consistent with the bottom contour of the medicine outlet sleeve 802, the blocking ball 804 can swing back and forth at the bottom of the medicine outlet sleeve 802, and the blocking ball 804 can completely block the bottom opening of the medicine outlet sleeve 802 when it is stationary. The blocking ball 804 is flipped between the two vertical rods 803 in the opposite direction of the arc plate 805, so that the blocking ball 804 04 is separated from the medicine discharging sleeve 802 and a gap is generated, so that the bottom opening of the medicine discharging sleeve 802 can be converted from a closed state to an open state, so that the chemical agents stored in the medicine adding cartridge 801 can flow out through the gap and be mixed into the filtered waste drilling fluid. Combined with the continuous stirring of the stirring blade 3, the chemical agents can be fully mixed with the waste drilling fluid. When the swing arm 806 does not conflict with the arc plate 805, the arc plate 805 and the blocking ball 804 are reset under the rebound action of the torsion spring, and the bottom opening of the medicine discharging sleeve 802 is blocked again, so that the chemical agents no longer flow out. By utilizing the time interval of the opening and closing of the bottom opening of the medicine discharging sleeve 802 and adopting a cyclic dosing method, the amount of chemical agents added at a single time can be reduced, making the amount of chemical agents added more scientific, reducing costs, and avoiding the introduction of new environmental problems, such as chemical residues and emissions.

[0046] In addition, the second tooth ring 601 rotates synchronously with the third tooth ring 902, so that the third tooth ring 902 will rotate synchronously with the medicine discharging sleeve 802, so that the medicine discharging sleeve 802 can rotate inside the medicine adding barrel 801 with the mixing blade 901, thereby stirring the chemical agents inside the medicine adding barrel 801, avoiding local solidification of the chemical agents, improving the fluidity of the chemical agents, and at the same time facilitating the chemical agents to flow smoothly into the mixing cylinder 1 and mix with the waste drilling fluid.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for screening and filtering waste drilling fluid in an oil field, comprising a stirring cylinder (1), a driving component (2) being fixedly connected to the top of the stirring cylinder (1), a stirring blade (3) being fixedly connected to the output shaft end of the driving component (2), the bottom end of the stirring blade (3) being located inside the stirring cylinder (1), characterized in that: A liquid inlet hopper (301) is fixedly connected to the top of the mixing cylinder (1), and the liquid inlet hopper (301) is communicated with the inside of the mixing cylinder (1). An auxiliary screening mechanism is arranged inside the liquid inlet hopper (301) for intercepting large particles of impurities in the waste drilling fluid to prevent the mixing blades (3) from being worn; the auxiliary screening mechanism comprises a fixed ring (401) rotatably connected to the inner wall of the bottom opening of the liquid inlet hopper (301), and a lifting rod (402) is slidably connected to the inner wall of the fixed ring (401), and the lifting rod (402) is slidably connected to the inner wall of the fixed ring (401). 02) A screening cylinder (403) is fixedly connected to the top, the screening cylinder (403) is rotatably matched with the inner wall of the top opening of the liquid inlet hopper (301), a first gear ring (404) is fixedly connected to the bottom of the lifting rod (402), a support rod (405) is fixedly connected to the inner wall of the bottom opening of the screening cylinder (403), a universal ball (406) is inserted into the inner wall at the middle of the support rod (405), and a filter cover (407) is fixedly connected to the bottom of the universal ball (406) and located below the support rod (405); A second toothed ring (601) is fixedly connected to the outer wall of the bottom end of the stirring blade (3), the second toothed ring (601) meshes with the first toothed ring (404), a support rod (602) is fixedly connected to the bottom of the second toothed ring (601) away from the stirring blade (3), a support block (603) is fixedly connected to the bottom of the first toothed ring (404), and the support rod (602) and the support block (603) are in contact with each other; An auxiliary dosing mechanism is also provided inside the mixing cylinder (1), and the auxiliary dosing mechanism comprises a dosing barrel (801) fixedly connected to the top of the mixing cylinder (1); a medicine discharging sleeve (802) is rotatably connected to the inner wall of the bottom of the dosing barrel (801); the bottom end of the medicine discharging sleeve (802) is arranged to penetrate the inner wall of the top of the rotating mixing cylinder (1); the dosing barrel (801) is connected to the inside of the medicine discharging sleeve (802); two vertical rods (803) are symmetrically fixedly connected to the bottom of the medicine discharging sleeve (802); a blocking ball (804) is hinged between the inner walls of the bottom ends of the two vertical rods (803); a torsion spring is sleeved inside the hinge of the blocking ball (804); the top contour of the blocking ball (804) matches the bottom contour of the medicine discharging sleeve (802); and the bottom of the blocking ball (804) is fixedly connected to an arc plate (805).

2. The oilfield waste drilling fluid screening and filtering device according to claim 1, characterized in that: The cross-sectional profile of the filter cover (407) is in the shape of a truncated cone, and the filter cover (407) is narrow at the top and wide at the bottom.

3. The oilfield waste drilling fluid screening and filtering device according to claim 1, characterized in that: A support collar (501) is fixedly connected to the inner wall of the top of the mixing cylinder (1) and is located below the opening of the liquid inlet hopper (301); a fixed cylinder (502) is fixedly connected inside the support collar (501); a filter bag (503) is fixedly connected to the inner wall of the fixed cylinder (502); the filter bag (503) is located directly below the bottom opening of the liquid inlet hopper (301); a screening rod (504) is fixedly connected to the inner wall of the first toothed ring (404); and the bottom end of the screening rod (504) is located on the surface of the filter bag (503).

4. The oilfield waste drilling fluid screening and filtering device according to claim 1, characterized in that: A sieve pipe (701) is fixedly connected to the top of the mixing tank (1) and located outside the bottom end of the liquid inlet bucket (301); one end of the sieve pipe (701) close to the liquid inlet bucket (301) is connected to the interior of the liquid inlet bucket (301); one end of the sieve pipe (701) away from the liquid inlet bucket (301) is fixedly connected to the outer wall of the mixing tank (1); one end of the sieve pipe (701) away from the liquid inlet bucket (301) is also connected to the interior of the mixing tank (1); a filter fine mesh (702) is fixedly connected to the corner of the sieve pipe (701) away from the liquid inlet bucket (301).

5. The oilfield waste drilling fluid screening and filtering device according to claim 4, characterized in that: A swing rod (806) is fixedly connected to the bottom of the second gear ring (601), and the arc-shaped end portion of the swing rod (806) away from the stirring blade (3) is in contact with the outer wall of the arc-shaped plate (805).

6. The oilfield waste drilling fluid screening and filtering device according to claim 1, characterized in that: The top of the medicine discharging sleeve (802) is fixedly connected with a mixing blade (901), and the mixing blade (901) is located inside the medicine adding sleeve (801). The outer wall of the bottom end of the medicine discharging sleeve (802) is fixedly connected with a third toothed ring (902), and the third toothed ring (902) is meshed with the second toothed ring (601).

7. The device for screening and filtering waste drilling fluid in oilfield according to claim 6, characterized in that: Three mixing leaves (901) are evenly and fixedly connected to the top of the medicine discharging sleeve (802), and the heights of the three mixing leaves (901) are all greater than the height of the medicine discharging sleeve (802).

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