Oil exploitation device with gravel filtering function

Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to an oil exploitation device with a gravel filtering function. The oil exploitation device comprises a collecting frame, the inner bottom wall of the collecting frame is fixedly connected with a filtering cylinder through a supporting rod, the upper end of the filtering cylinder is fixedly communicated with two oil conveying pipes, and the two oil conveying pipes are both in butt joint with an oil pipeline; and the centrifugal separation mechanism is used for achieving separation of petroleum and gravel through the effect of centrifugal force, the centrifugal separation mechanism comprises filtering holes formed in the peripheral side wall of the filtering cylinder, and a rotational flow block is rotationally installed in the filtering cylinder. Through the arrangement of the centrifugal separation mechanism and the design that the upper portion of a rotational flow block is inclined and contracts inwards, mixed fluid is guided to form spirally-descending rotational flow, and petroleum is rapidly separated through filtering holes through centrifugal force; and by arranging the gravel conveying mechanism, a separation-conveying continuous operation chain is formed, and the blocking risk caused by gravel accumulation is thoroughly eliminated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil exploitation, and particularly relates to an oil exploitation device with a sand filtering function. BACKGROUND

[0002] The oil exploitation device refers to a general term of equipment and systems for completing a series of operations such as drilling, oil production, and gathering and transportation in the process of oil exploitation, and the core function thereof is to extract underground crude oil from a reservoir to the ground and to perform preliminary treatment and transportation.

[0003] In the process of oil exploitation, especially in the initial stage of oil well production or after the adoption of measures such as fracturing and acidification, sand (rock debris, silt and other solid particles) in the formation will be extracted together with the crude oil. If these sands are not filtered, they will produce strong friction on the inner wall of the oil pump, sucker rod and oil pipe, resulting in surface wear of the equipment, increased clearance, and even pump leakage, rod and pipe breakage and other faults, which greatly shorten the service life of the equipment.

[0004] However, the existing oil exploitation device still has the following technical problems in the process of filtering sand: 1. Filter holes are prone to blockage: although the traditional centrifugal filter device can realize solid-liquid separation, sand is prone to accumulate near the filter holes. For example, in the prior art, sand is often relied on gravity to slide off, and when the sand particle size distribution is uneven or the mud content is high, local blockage of the filter holes will occur, resulting in increased resistance to oil flow, frequent shutdown for cleaning, and serious impact on exploitation efficiency; 2. Low recovery rate of residual oil in sand: the traditional centrifugal separation can only realize preliminary separation of solid and liquid, and the residual oil in the sand cannot be effectively recovered, there is a lack of design for extruding and dewatering the sand, and the residual oil cannot be fully squeezed out by mechanical means, resulting in limited recovery rate and resource waste; 3. The cleaning mechanism of the existing filter device relies on an independent power source (such as a pneumatic pump or motor), increasing the energy consumption and cost of the equipment. SUMMARY

[0005] The purpose of the present application is to solve the problems in the background art, and to provide an oil exploitation device with a sand filtering function, which can separate sand and oil by centrifugal force and form a continuous operation chain of "separation-transportation".

[0006] To achieve the above purpose, the following technical scheme is adopted: An oil exploitation device with a sand filtering function, comprising: A collection frame, the inner bottom wall of the collection frame is fixedly connected with a filter cylinder through a support rod, the upper end of the filter cylinder is fixedly connected with two oil conveying pipes, and the two oil conveying pipes are in butt joint with an oil pipeline; The centrifugal separation mechanism is used for separating oil and sand by the action of centrifugal force, and comprises a filter hole formed in the peripheral wall of a filter cylinder, and a cyclone block rotatably arranged in the filter cylinder. The sand conveying mechanism is used for conveying the sand accumulated in the filter cylinder, avoiding sand accumulation and collecting the sand, and comprises a conveying channel fixedly connected to the center of the cyclone block, a conveying auger rotatably connected in the conveying channel, a bottom end of the shaft of the conveying auger rotatably connected to the inner bottom wall of the filter cylinder, the rotating direction of the conveying auger opposite to that of the cyclone block, an annular receiving frame fixedly connected to the upper end of the filter cylinder, the conveying channel extending to the position above the annular receiving frame, and the conveying channel rotatably connected to the inner wall of the annular receiving frame.

[0007] Preferably, the upper end of the filter cylinder is provided with a transmission mechanism for driving the cyclone block and the conveying auger to synchronously rotate in opposite directions, the transmission mechanism comprising an L-shaped mounting plate fixedly connected to the upper end of the filter cylinder, a driving shaft rotatably connected to the lower end of the L-shaped mounting plate, a first motor fixedly connected to the upper end of the L-shaped mounting plate for controlling the rotation of the driving shaft, a driving gear fixedly connected to the bottom end of the driving shaft, a transmission gear fixedly connected to the top end of the shaft of the conveying auger, and a transmission gear ring fixedly connected to the upper end of the conveying channel through two connecting rods, the transmission gear and the transmission gear ring meshing with the two sides of the driving gear, respectively.

[0008] Preferably, the inside of the filter cylinder is provided with a magnetic extrusion mechanism for periodically extruding and draining oil from the sand accumulated in the filter cylinder, the magnetic extrusion mechanism comprising a driving ring arranged in the filter cylinder, a plurality of first magnetic blocks fixedly connected to the driving ring in circumferential array, a plurality of extrusion springs arranged in circumferential array at the bottom end of the cyclone block, an annular extrusion plate fixedly connected to the bottom end of the extrusion springs, two extension rods fixedly connected to the upper end of the annular extrusion plate, the two extension rods extending above the cyclone block and fixedly connected to second magnetic blocks, the first magnetic blocks and the second magnetic blocks attracting each other, and a filter membrane fixedly connected to the bottom end of the filter cylinder for draining oil from the sand during extrusion.

[0009] Preferably, the magnetic attraction force between the first magnetic blocks and the second magnetic blocks is greater than the sum of the elastic force of the extrusion springs and the gravity of the annular extrusion plate and the extension rods.

[0010] Preferably, the upper end of the filter cartridge is provided with a self-driven cleaning mechanism for cleaning the filter holes while the magnetic extrusion mechanism is working, the self-driven cleaning mechanism comprises a connecting plate penetratingly connected to the filter cartridge through rotation, the part of the connecting plate extending into the filter cartridge is fixedly connected with a driving ring, the part of the connecting plate extending above the filter cartridge is fixedly connected with an incomplete gear, the first magnetic block on the driving ring will drive the driving ring to rotate by a certain amplitude under the action of magnetic force when the first magnetic block is opposite to the second magnetic block, a plurality of circumferentially arrayed tooth grooves are arranged on the incomplete gear, the upper end of the filter cartridge is fixedly connected with two air suction boxes, an annular air exhaust box is arranged on the lateral side of the filter cartridge, a plurality of circumferentially arrayed exhaust holes are formed in the side of the annular air exhaust box close to the filter cartridge, a gas conveying hose is fixedly and communicatively connected between the air suction box and the annular air exhaust box, an air inlet is formed in the outer wall of one side of the air suction box, a piston plate is sealingly and slidably connected in the air suction box, a push rod is fixedly connected to the side of the piston plate away from the gas conveying hose, the push rod penetrates and extends out of the air suction box and is fixedly connected with a toothed plate, the tooth grooves on the incomplete gear periodically mesh with the toothed plate, and a return spring is arranged between the piston plate and the inner wall of the air suction box.

[0011] Preferably, one-way valves are arranged in the air inlet and the gas conveying hose.

[0012] Preferably, U-shaped rods are arranged at the upper end and the lower end of the filter cartridge respectively for connecting the part of the filter cartridge divided by the connecting plate and the part of the filter cartridge divided by the filter membrane.

[0013] Preferably, two groups of symmetrical reciprocating movement mechanisms are arranged on the inner wall of the collecting frame for driving the annular air exhaust box to periodically vertically displace and comprehensively clean the filter holes, the reciprocating movement mechanism comprises two support blocks fixedly connected to the inner wall of the collecting frame, a reciprocating screw rod is rotationally connected between the two support blocks, a lifting block is slidably connected to the inner wall of the collecting frame in the vertical direction, the lifting block is threadedly connected to the reciprocating screw rod, the lifting block is fixedly connected with the annular air exhaust box, and the upper end of one of the support blocks is fixedly connected with a second motor for driving the reciprocating screw rod.

[0014] Compared with the prior art, the petroleum exploitation device with sand and stone filtering function has the following advantages: 1. The centrifugal separation mechanism is arranged, the mixed fluid is guided to form spiral downward flow through the inclined and inwardly converging design of the cyclone block, the centrifugal force makes the petroleum quickly pass through the filter holes and separate, and the sand and stone slide along the cylinder wall to the bottom, so that the sand and stone accumulation in the filter holes is avoided from the source, and frequent shutdown and cleaning are not needed.

[0015] 2、The sand and stone conveying mechanism is arranged, the conveying auger and the cyclone block are driven to rotate in opposite directions, the sand and stone at the bottom is continuously conveyed upwards to the annular storage frame, a "separation-conveying" continuous operation chain is formed, and the blockage risk caused by sand and stone accumulation is completely eliminated.

[0016] 3、The transmission mechanism is arranged, a first motor is arranged, the centrifugal separation mechanism and the sand and stone conveying mechanism are driven to synchronously operate, an additional driving source is not needed, the purpose of energy saving and efficiency increasing is achieved.

[0017] 4、The magnetic extrusion mechanism is arranged, the magnetic attraction force of the first magnetic block and the second magnetic block is used to drive the annular extrusion plate to periodically extrude sand and stone, residual oil is discharged and recovered through the filter membrane, the oil recovery rate is improved, the extrusion action does not need an additional power source, and the mechanical energy of the rotation of the cyclone block and the magnetic attraction force are directly used for driving, so that the energy consumption of the device is reduced.

[0018] 5、The self-driven cleaning mechanism is arranged, when the magnetic extrusion mechanism works, the ring is driven to rotate to drive the incomplete gear to rotate, the toothed plate pushes the piston plate to generate reverse airflow impact, the filter hole backflushing cleaning can be realized without an independent power source, the structure is simplified, and the energy consumption is reduced.

[0019] 6、The reciprocating movement mechanism is arranged, in the filtering process, the second motor is started, the reciprocating screw rod is driven to rotate, the annular exhaust tank is driven to periodically move up and down along the filter cylinder body in the axial direction, the exhaust hole covers all filter hole regions, full-circumferential and multidimensional backflushing cleaning is realized, and local blockage is avoided. DRAWINGS

[0020] Figure 1 is a perspective structural schematic view of the present application; Figure 2 is a sectional view structural schematic view of the present application; Figure 3 is Figure 2 is an enlarged view of A in the figure; Figure 4 is a sectional view structural schematic view of the filter cylinder body in the present application; Figure 5 is Figure 4 is an enlarged view of B in the figure; Figure 6 is a sectional view structural schematic view of the self-driven cleaning mechanism in the present application.

[0021] In the figure: 1, collection frame; 11, filter cylinder body; 12, oil conveying pipe; 2, centrifugal separation mechanism; 21, filter hole; 22, cyclone block; 3, sand and stone conveying mechanism; 31, conveying channel; 32, conveying auger; 33, annular receiving frame; 4, transmission mechanism; 41, L-shaped mounting plate; 42, drive shaft; 43, first motor; 44, drive gear; 45, transmission gear; 46, transmission gear ring; 5, magnetic extrusion mechanism; 51, drive ring; 52, first magnetic block; 53, extrusion spring; 54, annular extrusion plate; 55, extension rod; 56, second magnetic block; 57, filter membrane; 6, self-driven cleaning mechanism; 61, connecting plate; 62, incomplete gear; 63, suction box; 64, annular exhaust box; 65, exhaust hole; 66, air hose; 67, piston plate; 68, push rod; 69, toothed plate; 610, return spring; 7, reciprocating movement mechanism; 71, support block; 72, reciprocating screw rod; 73, lifting block; 74, second motor. DETAILED DESCRIPTION

[0022] The following examples are for illustrative purposes only and are not intended to limit the scope of the present application.

[0023] Embodiment: Reference Figures 1 to 6 A petroleum exploitation device with sand and stone filtering function, comprising: The inner bottom wall of the collecting frame 1 is fixedly connected with a filter cylinder 11 through a support rod, the upper end of the filter cylinder 11 is fixedly connected with two oil conveying pipes 12, and the two oil conveying pipes 12 are in butt joint with a petroleum pipeline for introducing petroleum mixed fluid to be filtered; The centrifugal separation mechanism 2 is used for realizing the separation of petroleum and sand and stone by the action of centrifugal force, and comprises a filter hole 21 formed in the peripheral side wall of the filter cylinder 11, and a cyclone block 22 rotatably installed inside the filter cylinder 11, wherein the upper part of the cyclone block 22 is arranged to be inclined and inwardly contracted. Specifically, the filter hole 21 is a circular through hole with a hole diameter of 0.5-2mm, and the particle size of the rock debris is usually ≤2mm, so that the sand and stone can be filtered inside the filter cylinder 11.

[0024] In view of the problem that sand is easy to accumulate at the filter hole and cause blockage in the prior art, the centrifugal separation mechanism 2 is arranged, and due to the structure that the cyclone block 22 is inclined and shrinks inward above, the petroleum mixed fluid can form a spiral downward cyclone when the cyclone block 22 rotates, so that the petroleum and sand mixed fluid are thrown to the inner wall of the filter cylinder 11 under the action of centrifugal force, the sand is filtered inside the filter cylinder 11 by the filter hole 21, and the petroleum enters the collection frame 1, thereby realizing preliminary separation. Since the petroleum and sand have a tendency to be close to the filter cylinder 11 under the action of centrifugal force, the filtering effect can be ensured, and the sand can move downward along the inner wall of the filter cylinder 11 under the action of gravity, and is not always accumulated at the filter hole 21, thereby effectively avoiding blockage of the sand at the filter hole 21.

[0025] The sand conveying mechanism 3 is used for conveying the sand accumulated in the filter cylinder 11, and has a collection effect on the sand while avoiding accumulation of the sand. The sand conveying mechanism 3 comprises a conveying channel 31 fixedly connected to the center position of the cyclone block 22, a conveying auger 32 rotationally connected in the conveying channel 31, the bottom end of the shaft center of the conveying auger 32 being rotationally connected to the inner bottom wall of the filter cylinder 11, the rotating direction of the conveying auger 32 being opposite to the rotating direction of the cyclone block 22, and an annular receiving frame 33 fixedly connected to the upper end of the filter cylinder 11. The conveying channel 31 extends to the position above the annular receiving frame 33, and is rotationally connected to the inner wall of the annular receiving frame 33.

[0026] Specifically, the pitch of the conveying auger 32 is 8-12 cm, the gap between the outer diameter of the helical blade and the inner wall of the conveying channel 31 is 1-2 mm, the blade thickness is 3-5 mm, the material is wear-resistant alloy steel, the narrow gap design prevents backflow of the sand, the wear-resistant material is suitable for conveying high-hardness rock debris, and the pitch parameter balances the conveying efficiency and energy consumption.

[0027] During the filtering process, the conveying auger 32 can be driven to rotate in the direction opposite to that of the cyclone block 22, so as to convey the sand accumulated at the bottom of the filter cylinder 11 upward along the conveying channel 31 and finally into the annular receiving frame 33 for collection. The reverse rotation design not only avoids conflict between the sand and the movement direction of the cyclone block 22, ensures smooth conveying, but also continuously conveys the sand to prevent the sand from being accumulated at the bottom of the filter cylinder 11 for a long time and causing blockage of the filter hole 21.

[0028] The upper end of the filter cylinder 11 is provided with a transmission mechanism 4 for driving the cyclone block 22 and the conveying auger 32 to rotate in opposite directions synchronously, the transmission mechanism 4 comprises an L-shaped mounting plate 41 fixedly connected to the upper end of the filter cylinder 11, the lower end of the L-shaped mounting plate 41 is rotatably connected with a drive shaft 42, the upper end of the L-shaped mounting plate 41 is fixedly connected with a first motor 43 for controlling the rotation of the drive shaft 42, the bottom end of the drive shaft 42 is fixedly connected with a drive gear 44, the top end of the shaft of the conveying auger 32 is fixedly connected with a transmission gear 45, the upper end of the conveying channel 31 is fixedly connected with a transmission gear ring 46 through two connecting rods, and the transmission gear 45 and the transmission gear ring 46 are respectively meshed with the two sides of the drive gear 44.

[0029] It is worth mentioning that during the filtration, the first motor 43 is started to drive the drive shaft 42 to rotate, and the cyclone block 22 (fixed with the transmission gear ring 46) and the conveying auger 32 (fixed with the transmission gear 45) are driven by the drive gear 44 to rotate in opposite directions synchronously, so that the centrifugal separation mechanism 2 and the sand conveying mechanism 3 can be operated synchronously without additional power source, thereby achieving the purpose of energy saving and efficiency increasing.

[0030] The inside of the filter cylinder 11 is provided with a magnetic extrusion mechanism 5 for periodically extruding and draining oil from the sand stored in the inside of the filter cylinder 11, the magnetic extrusion mechanism 5 comprises a drive ring 51 arranged in the inside of the filter cylinder 11, a plurality of first magnetic blocks 52 arranged in a circumferential array are fixedly connected to the drive ring 51, a plurality of extrusion springs 53 arranged in a circumferential array are arranged at the bottom end of the cyclone block 22, the bottom end of the extrusion spring 53 is fixedly connected with an annular extrusion plate 54, two extension rods 55 are fixedly connected to the upper end of the annular extrusion plate 54, the two extension rods 55 extend above the cyclone block 22 and are fixedly connected with second magnetic blocks 56, the first magnetic blocks 52 and the second magnetic blocks 56 are attracted to each other by opposite poles, a filter membrane 57 is fixedly connected to the bottom end of the filter cylinder 11 for draining oil from the sand during extrusion, and the filter membrane 57 allows oil to pass through but retains sand.

[0031] Specifically, the magnetic attraction force between the first magnetic blocks 52 and the second magnetic blocks 56 is greater than the sum of the elastic force of the extrusion spring 53 and the gravity of the annular extrusion plate 54 and the extension rod 55.

[0032] Specifically, the first magnetic blocks 52 and the second magnetic blocks 56 are both neodymium-iron-boron permanent magnets, the surface magnetic induction intensity is ≥1.2T, the magnetic pole direction is perpendicular to the rotation plane of the cyclone block 22, and the N pole of the first magnetic block 52 is arranged opposite to the S pole of the second magnetic block 56, the strong magnet ensures sufficient magnetic attraction force, clearly defines the magnetic pole direction, avoids magnetic force cancellation, and ensures reliable extrusion action.

[0033] Specifically, the filter membrane 57 adopts a polypropylene microporous membrane with a pore size of 0.1-0.3μm and an oil resistance of ≥1000 hours (no swelling when immersed in crude oil). The membrane thickness is 0.5mm, and the edge is fixed to the bottom end of the filter cylinder 11 by ultrasonic welding. The micron-level pore size intercepts sand and gravel particles, the oil-resistant material ensures long-term use, and the welding process prevents liquid leakage.

[0034] In order to address the problem in the prior art that oil easily remains in sand and gravel, resulting in a reduced oil recovery rate, the present invention provides a magnetic extrusion mechanism 5. When the swirl block 22 rotates, the second magnetic block 56 periodically passes by the first magnetic block 52 on the drive ring 51. When the two are facing each other, the magnetic attraction force (greater than the sum of the elastic force of the extrusion spring 53 and the gravity of the components) pulls the extension rod 55 to drive the annular extrusion plate 54 upward, and the extrusion spring 53 is compressed; when the second magnetic block 56 and the first magnetic block 52 are misaligned, the extrusion spring 53 returns to its original position and pushes the annular extrusion plate 54 downward, periodically squeezing the sand and gravel, discharging the residual oil through the filter membrane 57, and improving the oil recovery rate.

[0035] A self-driven cleaning mechanism 6 is provided at the upper end of the filter cylinder 11 for cleaning the filter hole 21 while the magnetic extrusion mechanism 5 is working. The self-driven cleaning mechanism 6 includes a connecting plate 61 which is rotatably connected to the filter cylinder 11. The portion of the connecting plate 61 extending to the interior of the filter cylinder 11 is fixedly connected to the drive ring 51. The portion of the connecting plate 61 extending above the filter cylinder 11 is fixedly connected to an incomplete gear 62. When the first magnetic block 52 on the drive ring 51 is facing the second magnetic block 56, the drive ring 51 is driven as a whole to rotate to a certain extent under the action of magnetic attraction. The incomplete gear 62 is provided with a plurality of groups of teeth and grooves distributed in a circumferential array. The upper end of the filter cylinder 11 is fixedly connected to two An air suction box 63 is provided, and an annular exhaust box 64 is provided on the peripheral side of the filter cylinder 11. A plurality of exhaust holes 65 distributed in a circumferential array are provided on the side of the annular exhaust box 64 close to the filter cylinder 11. An air supply hose 66 is fixedly connected between the air suction box 63 and the annular exhaust box 64. An air inlet is provided on the outer wall of one side of the air suction box 63. A piston plate 67 is sealingly and slidingly connected inside the air suction box 63. A push rod 68 is fixedly connected to the side of the piston plate 67 away from the air supply hose 66. The push rod 68 extends through the outside of the air suction box 63 and is fixedly connected to a tooth plate 69. The teeth on the incomplete gear 62 periodically mesh with the tooth plate 69. A return spring 610 is provided between the piston plate 67 and the inner wall of the air suction box 63.

[0036] Specifically, one-way valves are provided in the air inlet and the air delivery hose 66 , and the provision of the one-way valves can ensure the one-way flow of the airflow.

[0037] Specifically, U-shaped rods are provided at the upper and lower ends of the filter cylinder 11 , respectively used to connect the portion of the filter cylinder 11 divided by the connecting plate 61 and the portion of the filter cylinder 11 divided by the filter membrane 57 .

[0038] In order to further avoid the filter hole 21 from being blocked, the self-driving cleaning mechanism 6 is arranged, when the second magnetic block 56 periodically passes through the first magnetic block 52, the magnetic attraction force can drive the driving ring 51 and the first magnetic block 52 to rotate by a certain amplitude as a whole, and the magnetic attraction force driving the driving ring 51 to rotate is sufficient to overcome the friction force when the tooth groove and the tooth plate 69 are engaged, and the elastic force of the reset spring 610, so that the driving ring 51 can rotate intermittently, and drive the incomplete gear 62 to rotate intermittently through the connecting plate 61, when the tooth groove and the tooth plate 69 are engaged, the push rod 68 pushes the piston plate 67 to compress the air in the air extraction tank 63, and the air flow in the air extraction tank 63 is sprayed out from the exhaust hole 65 through the air conveying hose 66, and the filter hole 21 is impacted in the opposite direction, so that the filter hole 21 is cleaned and the blocked impurities are removed; when the tooth groove is misaligned, the reset spring 610 pulls the piston plate 67 to reset, the air extraction tank 63 inhales the external air through the air inlet, and one cleaning cycle is completed, the power of the magnetic extrusion mechanism 5 can be used to drive the cleaning synchronously, without additional energy consumption, and the linkage of "extrusion oil discharge + filter hole cleaning" is realized.

[0039] Two groups of symmetrical reciprocating movement mechanisms 7 are arranged on the inner wall of the collection frame 1, which are used to drive the annular exhaust tank 64 to periodically vertically displace, so that the filter hole 21 is cleaned comprehensively, the reciprocating movement mechanism 7 comprises two support blocks 71 fixedly connected to the inner wall of the collection frame 1, a reciprocating screw rod 72 rotatably connected between the two support blocks 71, a lifting block 73 slidably connected to the inner wall of the collection frame 1 in the vertical direction, the lifting block 73 being threadedly connected to the reciprocating screw rod 72, and the lifting block 73 being fixedly connected with the annular exhaust tank 64, and the upper end of one of the support blocks 71 being fixedly connected with a second motor 74 for driving the reciprocating screw rod 72.

[0040] It should be noted that during the filtering process, the second motor 74 is started to drive the reciprocating screw rod 72 to rotate, and the annular exhaust tank 64 is periodically moved up and down along the axis of the filter cylinder body 11, so that the exhaust hole 65 covers the whole filter hole 21 area, and the reverse cleaning is realized in the whole circumferential direction and multidimensionally, so as to avoid local blockage.

[0041] The function principle of the present application can be described as follows: I. centrifugal separation principle 1. formation of rotational flow: when the mixed fluid of oil and sand enters the filter cylinder body 11 through the oil conveying pipe 12, the first motor 43 drives the driving shaft 42 to rotate, and drives the transmission gear ring 46 to rotate through the driving gear 44, so that the rotational flow block 22 rotates at high speed; the structure above the rotational flow block 22 is inclined and inwardly convergent, which guides the mixed fluid to form a spiral downward rotational flow, and the centrifugal force makes the oil and sand in the fluid be thrown to the inner wall of the filter cylinder body 11.

[0042] 2, preliminary separation: oil is smaller in density, through the filter hole 21 into the collection frame 1, complete the preliminary filtration; sandstone because of the larger density, along the inner wall of the filter cylinder 11 down to the bottom of the accumulation, to avoid blocking the filter hole 21.

[0043] II, sandstone conveying principle 1, reverse rotation design: drive gear 44 is engaged with transmission gear 45 at the same time, driving the conveying auger 32 and cyclone block 22 reverse rotation; cyclone block 22 clockwise rotation, conveying auger 32 counterclockwise rotation, the movement direction of the two is opposite, to avoid sandstone because of the cyclone block is thrown to the wall, to ensure smooth conveying.

[0044] 2, continuous conveying process: the spiral blade of the conveying auger 32 will filter cylinder 11 bottom of the sandstone along the conveying channel 31 up to the end of the ring-shaped collection frame 33 to achieve centralized collection.

[0045] The design of reverse rotation can form a continuous operation chain of "cyclone separation + directional conveying", to prevent sandstone from accumulating at the bottom and blocking the filter hole 21.

[0046] III, magnetic extrusion oil discharge principle 1, magnetic linkage mechanism: when the cyclone block 22 rotates, the second magnetic block 56 at the bottom of the cyclone block periodically passes through the first magnetic block 52 on the drive ring 51 (the two are opposite poles); when the second magnetic block 56 is aligned with the first magnetic block 52, the magnetic attraction force is greater than the sum of the compression spring 53 elastic force and the weight of the ring-shaped extrusion plate 54 and other components, pulling the extension rod 55 to drive the ring-shaped extrusion plate 54 to move up, and the compression spring 53 is compressed; when they are misaligned, the compression spring 53 resets and pushes the ring-shaped extrusion plate 54 downward to extrude the sandstone.

[0047] 2, oil discharge and efficiency improvement: periodic extrusion makes the residual oil in the sandstone discharge through the filter membrane 57, backflow to the collection frame 1, improving the oil recovery rate, and the filter membrane 57 only allows liquid to pass through, retaining sandstone, achieving "solid-liquid secondary separation".

[0048] IV, self-driven filter hole cleaning principle 1, magnetic-mechanical linkage: the drive ring 51 is fixedly connected with the incomplete gear 62 through the connecting plate 61, when the second magnetic block 56 is magnetically attracted to the first magnetic block 52, the drive ring 51 is driven to rotate a small amount by the magnetic attraction force, and at the same time, the incomplete gear 62 is driven to rotate through the connecting plate 61.

[0049] 2. Air pulse recoil: when the tooth groove of the incomplete gear 62 meshes with the tooth plate 69, it pushes the push rod 68 to drive the piston plate 67 to compress the air in the air extraction tank 63, the air flow is sprayed out from the exhaust hole 65 of the annular exhaust tank 64 through the air conveying hose 66, so that the air around the filter cylinder body 11 has a tendency to flow to the inside of the filter cylinder body 11, thereby making the air flow impact the filter hole 21 in the opposite direction, and removing the attached impurities; when the tooth groove is misaligned, the return spring 610 pulls the piston plate 67 to reset, the air extraction tank 63 sucks in the external air through the one-way valve, and a cleaning cycle is completed.

[0050] 3. Full circumferential coverage: the reciprocating wire rod 72 is driven to rotate by the second motor 74, which drives the annular exhaust tank 64 to move up and down along the filter cylinder body 11 in the axial direction, so that the exhaust hole 65 covers all the filter hole 21 areas, realizing multi-dimensional and dead angle-free recoil cleaning.

[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An oil production device with sand and gravel filtering function, characterized in that: include: A collecting frame (1), wherein the inner bottom wall of the collecting frame (1) is fixedly connected to a filter cylinder (11) via a support rod, and the upper end of the filter cylinder (11) is fixedly connected to two oil pipelines (12), and the two oil pipelines (12) are both connected to the oil pipeline; A centrifugal separation mechanism (2) is used to separate oil from sand and gravel by centrifugal force, the centrifugal separation mechanism (2) comprising a filter hole (21) provided on the peripheral side wall of a filter cylinder (11), a swirl block (22) being rotatably mounted inside the filter cylinder (11), and the upper portion of the swirl block (22) being inclined and contracted inwardly; A sand and gravel conveying mechanism (3) is used to convey sand and gravel retained in the filter cylinder (11), thereby preventing sand and gravel from accumulating and collecting the sand and gravel. The sand and gravel conveying mechanism (3) comprises a conveying channel (31) fixedly connected to the center position of the swirl block (22). A conveying auger (32) is rotatably connected in the conveying channel (31). The bottom end of the axis of the conveying auger (32) is rotatably connected to the inner bottom wall of the filter cylinder (11). The rotation direction of the conveying auger (32) is opposite to the rotation direction of the swirl block (22). An annular receiving frame (33) is fixedly connected to the upper end of the filter cylinder (11). The conveying channel (31) extends to a position above the annular receiving frame (33), and the conveying channel (31) is rotatably connected to the inner wall of the annular receiving frame (33).

2. The oil production device with sand and gravel filtering function according to claim 1, characterized in that: The upper end of the filter cylinder (11) is provided with a transmission mechanism (4) for driving the swirl block (22) and the conveying auger (32) to rotate synchronously in opposite directions. The transmission mechanism (4) comprises an L-shaped mounting plate (41) fixedly connected to the upper end of the filter cylinder (11). The lower end of the L-shaped mounting plate (41) is rotatably connected to a drive shaft (42). The upper end of the L-shaped mounting plate (41) is fixedly connected to a first motor (43) for controlling the rotation of the drive shaft (42). The bottom end of the drive shaft (42) is fixedly connected to a drive gear (44). The top end of the axis of the conveying auger (32) is fixedly connected to a transmission gear (45). The upper end of the conveying channel (31) is fixedly connected to a transmission gear ring (46) via two connecting rods. The transmission gear (45) and the transmission gear ring (46) are respectively engaged with two sides of the drive gear (44).

3. The oil production device with sand and gravel filtering function according to claim 1, characterized in that: A magnetic squeezing mechanism (5) is provided inside the filter cylinder (11) for periodically squeezing and draining the sand and gravel retained inside the filter cylinder (11). The magnetic squeezing mechanism (5) comprises a driving ring (51) provided inside the filter cylinder (11). A plurality of first magnetic blocks (52) distributed in a circumferential array are fixedly connected to the driving ring (51). A plurality of squeezing springs (53) distributed in a circumferential array are provided at the bottom end of the swirl block (22). The bottom end of the squeezing spring (53) is fixedly connected to an annular squeezing plate (54). The upper end of the annular squeezing plate (54) is fixedly connected to two extension rods (55). The two extension rods (55) extend above the swirl block (22) and are fixedly connected to a second magnetic block (56). The first magnetic block (52) and the second magnetic block (56) attract each other with opposite poles. A filter membrane (57) is fixedly connected to the bottom end of the filter cylinder (11) for draining the oil therein when squeezing the sand and gravel.

4. The oil production device with sand and gravel filtering function according to claim 3, characterized in that: The magnetic attraction force between the first magnetic block (52) and the second magnetic block (56) is greater than the sum of the elastic force of the extrusion spring (53) and the gravity of the annular extrusion plate (54) and the extension rod (55).

5. The oil production device with sand and gravel filtering function according to claim 3, characterized in that: The upper end of the filter cylinder (11) is provided with a self-driven cleaning mechanism (6) for cleaning the filter hole (21) while the magnetic extrusion mechanism (5) is working. The self-driven cleaning mechanism (6) includes a connecting plate (61) that is rotatably connected to the filter cylinder (11). The portion of the connecting plate (61) extending to the inside of the filter cylinder (11) is fixedly connected to the drive ring (51). The portion of the connecting plate (61) extending above the filter cylinder (11) is fixedly connected to an incomplete gear (62). When the first magnetic block (52) on the drive ring (51) is facing the second magnetic block (56), it will drive the drive ring (51) as a whole to rotate to a certain extent under the action of magnetic attraction. The incomplete gear (62) is provided with multiple groups of tooth grooves distributed in a circumferential array. The upper end of the filter cylinder (11) is fixedly connected to two air extraction boxes (6 3), an annular exhaust box (64) is provided on the circumferential side of the filter cylinder (11), and a plurality of exhaust holes (65) distributed in a circumferential array are provided on the side of the annular exhaust box (64) close to the filter cylinder (11), and a gas hose (66) is fixedly connected between the air pumping box (63) and the annular exhaust box (64), and an air inlet is provided on the outer wall of one side of the air pumping box (63), and a piston plate (67) is sealed and slidably connected in the air pumping box (63), and a push rod (68) is fixedly connected to the side of the piston plate (67) away from the gas hose (66), and the push rod (68) extends through the outside of the air pumping box (63) and is fixedly connected to a tooth plate (69), and the tooth grooves on the incomplete gear (62) periodically engage with the tooth plate (69), and a return spring (610) is provided between the piston plate (67) and the inner wall of the air pumping box (63).

6. The oil production device with sand and gravel filtering function according to claim 5, characterized in that: One-way valves are provided in the air inlet and the air delivery hose (66).

7. The oil production device with sand and gravel filtering function according to claim 5, characterized in that: The upper end and the lower end of the filter cylinder (11) are both provided with U-shaped rods, which are used to connect the portion of the filter cylinder (11) divided by the connecting plate (61) and the portion of the filter cylinder (11) divided by the filter membrane (57), respectively.

8. The oil production device with sand and gravel filtering function according to claim 5, characterized in that: Two groups of symmetrically distributed reciprocating mechanisms (7) are provided on the inner wall of the collection frame (1) for driving the annular exhaust box (64) to perform periodic vertical displacement to achieve comprehensive cleaning of the filter hole (21). The reciprocating mechanism (7) includes two support blocks (71) fixedly connected to the inner wall of the collection frame (1), a reciprocating screw (72) is rotatably connected between the two support blocks (71), a lifting block (73) is slidably connected to the inner wall of the collection frame (1) along the vertical direction, the lifting block (73) is threadedly connected to the reciprocating screw (72), the lifting block (73) is fixedly connected to the annular exhaust box (64), and a second motor (74) for driving the reciprocating screw (72) is fixedly connected to the upper end of one of the support blocks (71).

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