High-pressure polymer injection skid-mounted equipment for oil field

Abstract

The invention belongs to the technical field of oil field polymer injection equipment, and particularly relates to oil field high-pressure polymer injection skid-mounted equipment which comprises a container, a polymer injection pump is arranged in the container, the input end of the polymer injection pump is connected with a liquid inlet pipeline, and the output end of the polymer injection pump is connected with an injection pipeline; a lubricating pump is also arranged in the container and is connected with the polymer injection pump; a communicating pipe is connected to the liquid inlet pipeline, the other end of the communicating pipe is connected with the injection pipeline, and a valve is arranged on the communicating pipe; an electromagnetic flowmeter is arranged on the injection pipeline, and valves are arranged on the two sides of the electromagnetic flowmeter; the problems that an existing offshore oil production platform is small in space, and the oil field recovery ratio is affected are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield polymer injection equipment, and particularly relates to a high-pressure oilfield polymer injection skid-mounted equipment. Background Art

[0002] Polymer flooding is an enhanced oil recovery measure that involves injecting polymers into the formation for oil displacement. Macroscopically, it mainly relies on increasing the viscosity of the displacement fluid and reducing the mobility ratio between the displacement fluid and the displaced fluid, thereby expanding the swept volume. Microscopically, due to its inherent viscoelasticity, the polymer generates a stretching effect on the oil film or oil droplets during the flow process, increasing the carrying capacity and improving the microscopic oil washing efficiency.

[0003] High-pressure polymer injection in polymer oilfields is a technology for improving oil recovery in oilfield development. Its core is to inject polymer solution into the oil layer under high pressure to optimize the oil displacement effect. Currently, the tertiary oil recovery technology in onshore oilfields has been relatively mature, but the tertiary oil recovery in offshore oilfields is still in the exploratory development stage.

[0004] During the application process of tertiary oil recovery in offshore heavy oil oilfields, due to the special structure and limited available space of the oil production platform, the polymer injection and blending stations and intermittent liquid blending modes applied to onshore oilfields are difficult to be popularized and applied on offshore oil production platforms due to problems such as large floor area, long construction period, and complex operation and maintenance, which restricts the improvement of oil recovery in offshore oilfields. Therefore, there is an urgent need for a skid-mounted design with high integration, small overall floor area, and convenient movement for high-pressure oilfield polymer injection skid-mounted equipment. Summary of the Invention

[0005] In view of the above situation, to overcome the defects of the prior art, the present invention provides a high-pressure oilfield polymer injection skid-mounted equipment, effectively solving the problem that the small space of the existing offshore oil production platform affects the oil recovery rate.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A high-pressure oilfield polymer injection skid-mounted equipment, including a container. Inside the container, there is a polymer injection pump. The input end of the polymer injection pump is connected to a liquid inlet pipeline, and the output end of the polymer injection pump is connected to an injection pipeline. A lubricating pump is also provided inside the container, and the lubricating pump is connected to the polymer injection pump. A connecting pipe is connected to the liquid inlet pipeline, and the other end of the connecting pipe is connected to the injection pipeline. A valve is provided on the connecting pipe. An electromagnetic flowmeter is provided on the injection pipeline, and valves are provided on both sides of the electromagnetic flowmeter.

[0007] Further, pressure transmitters are provided on both the liquid inlet pipeline and the injection pipeline. The pressure transmitter on the injection pipeline is located between the valve on the side of the electromagnetic flowmeter and the connecting pipe. A silencing check valve is also provided on the injection pipeline, and the silencing check valve is located between the valve on the other side of the electromagnetic flowmeter and the electromagnetic flowmeter.

[0008] Furthermore, the polymer injection pump includes a bottom plate connected to the container, and a transmission box is fixedly connected to the bottom plate; a pressure structure is provided in the transmission box, and a plurality of pressurizing structures are provided on one side of the pressure structure; a connection structure is provided between the pressure structure and the adjacent pressurizing structures and between adjacent pressurizing structures, and a driving structure is also provided in the transmission box, and the driving structure can drive a plurality of the connection structures to act in sequence.

[0009] Furthermore, a feed pipe and a discharge pipe are fixedly connected to the transmission box, the lubricating pump is connected to the discharge pipe, and a pressure pipe is also fixedly connected in the transmission box; both the pressure structure and the pressurizing structure are connected to the pressure pipe; a plurality of one-way pipes are connected to both the feed pipe and the discharge pipe, the other ends of the plurality of one-way pipes are communicated with the pressure pipe, and one-way valves are provided in the plurality of one-way pipes.

[0010] Furthermore, both the pressure structure and the pressurizing structure include a crankshaft rotatably connected to the transmission box, and a connecting rod is rotatably connected to the crankshaft; a piston is rotatably connected to the connecting rod, a plurality of cylinders are fixedly connected to the pressure pipe, and the piston is slidably connected to the cylinder.

[0011] Furthermore, the connection structure includes a spline shaft connected to the drive shaft of the pressure structure and the drive shaft of the pressurizing structure, and a spline cylinder is slidably connected to the spline shaft; a main clutch block is fixedly connected to the spline cylinder, and a driven clutch block cooperating with the main clutch block is also connected to the drive shaft of the pressurizing structure.

[0012] Furthermore, a worm is rotatably connected in the transmission box, and a worm gear is engaged with the worm; the worm gear is coaxially fixedly connected with a crank, a connecting rod is rotatably connected to the crank, a traction cylinder slidably connected to the transmission box is rotatably connected to the connecting rod, and the spline cylinder is rotatably connected to the traction cylinder.

[0013] Furthermore, the driving structure includes a driving wheel rotatably connected to the transmission box, and a rack slidably connected in the transmission box meshes with a plurality of driving wheels respectively in sequence; the driving wheel is coaxially fixedly connected with a large bevel gear, and a small bevel gear coaxially fixedly connected with the worm is engaged with the large bevel gear.

[0014] Furthermore, an adjustment motor is fixedly connected in the transmission box, an output end of the adjustment motor is connected with an adjustment screw; a safety component is connected to the adjustment screw, a slider slidably connected to the transmission box is connected to the safety component, and the slider is fixedly connected to the rack.

[0015] Further, the safety component includes a rotating cylinder screwed to the adjusting screw rod, and the rotating cylinder is rotatably connected to the slider; a guiding block is fixedly connected to the slider, and a guiding rod is slidably connected to the guiding block; a plugging block is fixedly connected to the guiding rod, and a plugging groove cooperating with the plugging block is provided on the rotating cylinder; a top spring acting on the plugging block is sleeved on the guiding rod, and the top spring is arranged between the guiding block and the plugging block; a driving block perpendicular to the moving direction of the guiding rod is slidably connected to the guiding block, a V-shaped groove is provided on the driving block, and a pin shaft cooperating with the V-shaped groove is provided on the plugging block; a pair of stoppers are fixedly connected in the transmission box, and the pair of stoppers are respectively arranged at two ends of the adjusting screw rod.

[0016] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. When the present invention is in use, by integrating a polymer injection pump, a lubricating pump, various control cabinets, pipelines and valves in a container, the present application has a high degree of integration, a small overall floor area, and is convenient to move, improving the advantages of the present application in offshore oilfield applications.

[0017] 2. When the present invention is in use, through the settings of a pressure structure, a pressurizing structure, a connecting structure, a driving structure, etc. on the polymer injection pump, the polymer injection pump can realize free switching between multiple cylinders (3 cylinders, 5 cylinders) of one pump, and mechanical control enables the present application to not only adapt to small-displacement injection working conditions, but also adapt to large-displacement injection working conditions, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the polymer injection pump in the present invention; Figure 3 It is a schematic internal structure diagram of the polymer injection pump in the present invention; Figure 4 It is a top view of the internal structure of the polymer injection pump in the present invention; Figure 5 It is a schematic diagram of the cooperation state of structures such as the pressurizing structure, the connecting structure, and the driving structure in the present invention; Figure 6 It is a schematic diagram of the cooperation state of structures such as the pressurizing structure and the connecting structure in the present invention; Figure 7 It is a schematic diagram of the cooperation state of structures such as the slider, the rack, and the safety component in the present invention; Figure 8 It is a schematic structural diagram of the safety component in the present invention; Figure 9 It is a schematic diagram of the cooperation state of structures such as the rotating cylinder, the plugging block, and the guiding block in the present invention; In the figure: 1, control cabinet; 2, polymer injection pump; 3, pulsation damper; 4, pressure transmitter; 5, electromagnetic flowmeter; 6, connecting pipe; 7, lubricating pump; 8, bottom plate; 9, polymer injection motor; 10, transmission box; 11, discharge flange; 12, feed flange; 13, discharge pipe; 14, feed pipe; 15, pressure pipe; 16, check valve; 17, cylinder; 18, piston; 19, crankshaft; 20, connecting rod; 21, adjustment motor; 22, driving pulley; 23, driven pulley; 24, adjustment screw; 25, driving wheel; 26, slider; 27, rack; 28, worm; 29, worm gear; 30, crank; 31, spline shaft; 32, connecting rod; 33, spline barrel; 34, traction barrel; 35, driving clutch block; 36, driven clutch block; 37, large bevel gear; 38, small bevel gear; 39, stop block; 40, guide block; 41, driving block; 42, V-shaped groove; 43, rotating cylinder; 44, pin shaft; 45, plug-in block; 46, guide rod; 47, top spring. Detailed implementation manners

[0019] An oilfield high-pressure polymer injection skid-mounted device, as Figures 1-9 shown, includes a container. Inside the container, there is a polymer injection pump 2. The input end of the polymer injection pump 2 is connected with a liquid inlet pipeline, and the output end of the polymer injection pump 2 is connected with an injection pipeline. The liquid inlet pipeline is connected with a ripening tank, and the injection pipeline is connected with a wellhead. That is, through the polymer injection pump 2 inside the container, the polymer ripened in the ripening tank is injected into the oil well through the injection pipeline. Inside the container, there is also a lubricating pump 7, and the lubricating pump 7 is connected with the polymer injection pump 2. When the polymer injection pump 2 operates at a low frequency, the lubricating pump 7 lubricates the polymer injection pump 2 to ensure the normal use of the polymer injection pump 2.

[0020] A connecting pipe 6 is connected to the liquid inlet pipeline, and the other end of the connecting pipe 6 is connected with the injection pipeline. A valve is provided on the connecting pipe 6. An electromagnetic flowmeter 5 is provided on the injection pipeline, and valves are provided on both sides of the electromagnetic flowmeter 5. The valve is preferably a plug valve. A pulsation damper 3 is also provided on the injection pipeline. The pulsation damper 3 is arranged between the polymer injection pump 2 and the connecting pipe 6 to eliminate the pressure pulsation (fluctuation) of the injection pipeline and make the pipeline pressure stable within a certain range.

[0021] Inside the container, there is also a variable frequency control cabinet 1. Inside the variable frequency control cabinet 1, there is a frequency converter for controlling the polymer injection pump 2 and the electromagnetic flowmeter 5. Inside the container, there is also a PLC control cabinet 1 for controlling the polymer ripening stage, making the ripening and polymer injection of the polymer linked, and improving the convenience of this application.

[0022] Further, pressure transmitters 4 are provided on both the liquid inlet pipeline and the injection pipeline. The pressure transmitter 4 on the injection pipeline is arranged between the valve on one side of the electromagnetic flowmeter 5 and the connecting pipe 6. A silencing check valve is also provided on the injection pipeline, and the silencing check valve is arranged between the valve on the other side of the electromagnetic flowmeter 5 and the electromagnetic flowmeter 5.

[0023] Further, the polymer injection pump 2 includes a bottom plate 8 connected to the container, and a transmission box 10 is fixedly connected to the bottom plate 8. A pressure structure is arranged in the transmission box 10, and a plurality of pressurizing structures are arranged on one side of the pressure structure. Connection structures are arranged between the pressure structure and the adjacent pressurizing structures and between adjacent pressurizing structures. A driving structure is also arranged in the transmission box 10, and the driving structure can drive the plurality of connection structures to act in sequence.

[0024] Through the settings of the pressure structure, pressurizing structure, connection structure, driving structure, etc. of the polymer injection pump 2, the polymer injection pump 2 can realize free switching between one pump with multiple cylinders (3 cylinders, 5 cylinders), and mechanical control, so that this application can not only adapt to small-displacement injection working conditions, but also adapt to large-displacement injection working conditions, and has a wide range of applications.

[0025] Further, as Figure 3 and Figure 4 shown, a feed pipe 14 and a discharge pipe 13 are fixedly connected to the transmission box 10. The lubricating pump 7 is connected to the discharge pipe 13. A pressure pipe 15 is also fixedly connected in the transmission box 10. The pressure structure and the pressurizing structure are both connected to the pressure pipe 15. A feed flange 12 is provided on the feed pipe 14, and a discharge flange 11 is provided on the discharge pipe 13. The feed pipe 14 is connected to the liquid inlet pipeline through the feed flange 12, and the discharge pipe 13 is connected to the injection pipeline through the discharge flange 11. A plurality of one-way pipes 16 are connected to both the feed pipe 14 and the discharge pipe 13. The other ends of the plurality of one-way pipes 16 are all communicated with the pressure pipe 15, and one-way valves are arranged in the plurality of one-way pipes 16. Under the action of the pressure structure and the pressurizing structure, through the setting of the one-way valves, the polymer in the feed pipe 14 flows into the pressure pipe 15 through the one-way pipes 16 and the one-way valves, and then flows into the discharge pipe 13 through the pressure pipe 15, one-way pipes 16 and one-way valves, and then flows into the injection pipeline.

[0026] Further, both the pressure structure and the pressurizing structure include a crankshaft 19 rotatably connected to the transmission case 10, and a connecting rod 20 is rotatably connected to the crankshaft 19; a piston 18 is rotatably connected to the connecting rod 20, and a plurality of cylinders 17 are fixedly connected to the pressure pipe 15, and the piston 18 is slidably connected to the cylinders 17; preferably, three sets of connecting rods 20 are connected to the crankshaft 19 of the pressure structure, and the three sets of connecting rods 20 are respectively connected to cylinders 17. When the crankshaft 19 of the pressure structure rotates, it is equivalent to a three-cylinder polymer injection pump 2 (small displacement); a polymer injection motor 9 is fixedly connected to the bottom plate 8, and the output end of the polymer injection motor 9 is connected to a driving pulley 22; a driving pulley 22 is fixedly connected to the crankshaft 19 of the pressure structure, and a belt for driving a driven pulley 23 to rotate is provided on the driving pulley 22.

[0027] When the pressure structure and the pressurizing structure are in use, start the polymer injection motor 9. The polymer injection motor 9 drives the crankshaft 19 on the pressure structure to rotate through the driving pulley 22, the belt, and the driven pulley 23, and the crankshaft 19 drives the crankshaft 19 of the pressurizing structure to rotate synchronously through the connection structure; the crankshaft 19 drives the piston 18 to slide along the cylinder 17 through the connecting rod 20, thereby realizing providing pressure for the pressure pipe 15 and realizing the polymer injection.

[0028] Further, as Figure 5 and Figure 6 shown, the connection structure includes a spline shaft 31 connected to the drive shafts of the pressure structure and the pressurizing structure. A spline cylinder 33 is slidably connected to the spline shaft 31; a driving clutch block 35 is fixedly connected to the spline cylinder 33, and a driven clutch block 36 that cooperates with the driving clutch block 35 is also connected to the drive shaft of the pressurizing structure; by sliding the spline cylinder 33 along the spline shaft 31, the separation and engagement of the driving clutch block 35 and the driven clutch block 36 are realized, and the separation and connection of the pressure structure and the pressurizing structure, as well as the separation and connection between adjacent pressurizing structures, are realized.

[0029] Further, a worm 28 is rotatably connected in the transmission case 10, and a worm gear 29 is engaged with the worm 28; the worm gear 29 is coaxially fixedly connected with a crank 30, a connecting rod 32 is rotatably connected to the crank 30, a traction cylinder 34 slidably connected to the transmission case 10 is rotatably connected to the connecting rod 32, and the spline cylinder 33 is rotatably connected to the traction cylinder 34.

[0030] When the active clutch block 35 needs to be separated from or engaged with the driven clutch block 36, the worm 28 is rotated. The worm 28 drives the crank 30 to rotate through the worm gear 29. The crank 30, the connecting rod 32, and the traction cylinder 34 form a crank-slider mechanism. The crank 30 drives the traction cylinder 34 to slide along the transmission case 10 through the connecting rod 32. The traction cylinder 34 drives the spline cylinder 33 to move linearly, and the spline cylinder 33 drives the active clutch block 35 to move linearly, so as to realize the separation or engagement between the active clutch block 35 and the driven clutch block 36. Through the self-locking characteristics of the worm 28 and the worm gear 29, the crank 30 is self-locked to improve the connection stability between the active clutch block 35 and the driven clutch block 36.

[0031] Further, the driving structure includes a driving wheel 25 rotatably connected to the transmission case 10. A rack 27 is slidably connected in the transmission case 10 and meshes with a plurality of driving wheels 25 in sequence. The driving wheel 25 is coaxially and fixedly connected with a large bevel gear 37. A small bevel gear 38 coaxially and fixedly connected with the worm 28 meshes with the large bevel gear 37. The transmission ratio of the large bevel gear 37 to the small bevel gear 38 is 2:1.

[0032] By sliding the rack 27 along the transmission case 10, the rack 27 meshes with a plurality of driving wheels 25 on the movement route of the rack 27 in sequence. When the rack 27 slides along the transmission case 10, the corresponding driving wheel 25 is driven to rotate. The driving wheel 25 drives the large bevel gear 37 to rotate, the large bevel gear 37 drives the small bevel gear 38 to rotate, and the small bevel gear 38 drives the worm 28 to rotate. By sliding the rack 27 along the transmission case 10, the sequential movement of a plurality of driving wheels 25 is realized, and a plurality of pressing structures are connected in sequence to improve the stability of the pressing structures.

[0033] Further, as Figure 5 、 7 shown in FIG. -9, an adjustment motor 21 is fixedly connected in the transmission case 10. The output end of the adjustment motor 21 is connected with an adjustment screw 24. A safety component is connected to the adjustment screw 24. A slider 26 slidably connected to the transmission case 10 is connected to the safety component. The slider 26 is fixedly connected with the rack 27. By driving the adjustment screw 24 to rotate through the adjustment motor 21, the adjustment screw 24 and the safety component cooperate to drive the slider 26 to slide along the transmission case 10, and the slider 26 drives the rack 27 to move.

[0034] Further, the safety component includes a rotating cylinder 43 screwed to the adjusting screw 24, and the rotating cylinder 43 is rotatably connected to the slider 26; a guiding block 40 is fixedly connected to the slider 26, and a guiding rod 46 is slidably connected to the guiding block 40; a plugging block 45 is fixedly connected to the guiding rod 46, and a plugging slot cooperating with the plugging block 45 is provided on the rotating cylinder 43; a top spring 47 acting on the plugging block 45 is sleeved on the guiding rod 46, and the top spring 47 is arranged between the guiding block 40 and the plugging block 45; a driving block 41 perpendicular to the moving direction of the guiding rod 46 is slidably connected to the guiding block 40, a V-shaped groove 42 is provided on the driving block 41, and a pin shaft 44 cooperating with the V-shaped groove 42 is provided on the plugging block 45; a pair of stop blocks 39 are fixedly connected in the transmission box 10, and the pair of stop blocks 39 are respectively arranged at two ends of the adjusting screw 24.

[0035] When the safety component is in use, as Figure 8 and Figure 9 shown in the schematic diagram of the connection state between the plugging block 45 and the plugging slot, under the action of the plugging block 45, the plugging slot, the guiding rod 46, and the guiding block 40, the rotating cylinder 43 and the slider 26 are relatively fixed; when the adjusting screw 24 rotates, since the rotating cylinder 43 is screwed to the adjusting screw 24, the adjusting screw 24 drives the rotating cylinder 43, the plugging block 45, the slider 26, etc. as a whole to slide along the transmission box 10; when the driving block 41 contacts the stop block 39, under the action of the stop block 39, the driving block 41 slides along the guiding block 40, and the driving block 41 cooperates with the pin shaft 44 on the plugging block 45 through the V-shaped groove 42 to drive the plugging block 45 to move away from the plugging slot until the plugging block 45 is separated from the plugging slot; when the adjusting screw 24 rotates, the rotating cylinder 43 can be driven to rotate synchronously, and the slider 26 remains stationary relative to the transmission box 10.

[0036] In summary, through the setting of the safety component, it is possible to prevent the slider 26 from continuously sliding along the transmission box 10 under the action of the adjusting screw 24 until it collides with the bearing seat supporting the adjusting screw 24, causing damage to the slider 26 and the adjusting screw 24, and improving the stability of the application.

[0037] As Figures 1 to 9 shown, the working process of the present invention will be specifically explained below.

[0038] When the present invention is in use, the polymerized injection pump 2 in the container injects the polymer that has been polymerized in the aging tank into the oil well through the injection pipeline; specifically, according to the required displacement of the polymerized injection pump 2, the driving structure is operated, so that the driving structure drives the connecting mechanism in sequence, so that the pressurizing structure is connected to the pressure structure, and the adjacent pressurizing structures are connected to each other to change the displacement of the polymerized injection pump 2; as Figures 3-5 shown, at this time, the polymerized injection pump 2 is at the maximum displacement, that is, the pressurizing structure is connected to the pressure structure, and the adjacent pressurizing structures are connected to each other.

[0039] When it is necessary to reduce the displacement of the polymer injection pump 2, start the adjustment motor 21. The adjustment motor 21 drives the adjustment screw 24 to rotate. The adjustment screw 24 cooperates with the safety component to drive the slider 26 to slide along the transmission box 10. The slider 26 drives the rack 27 to move. The rack 27 meshes and drives with a plurality of driving wheels 25 in the movement route of the rack 27 in sequence. The rack 27 drives the driving wheel 25 to rotate. The driving wheel 25 drives the large bevel gear 37 to rotate. The large bevel gear 37 drives the small bevel gear 38 to rotate. The small bevel gear 38 drives the worm 28 to rotate. The worm 28 drives the crank 30 to rotate through the worm gear 29. Since the crank 30, the connecting rod 32, and the traction cylinder 34 form a crank-slider mechanism, the crank 30 drives the traction cylinder 34 to slide along the transmission box 10 through the connecting rod 32. The traction cylinder 34 drives the spline cylinder 33 to move linearly. The spline cylinder 33 drives the active clutch block 35 to move linearly, realizing the separation of the active clutch block 35 and the driven clutch block 36. Make the rack 27 continuously slide along the gear box, and then separate between the pressurizing structures and between the pressurizing structure and the pressure structure, thereby realizing the reduction of the displacement of the polymer injection pump 2.

[0040] During polymer injection, start the polymer injection motor 9. The polymer injection motor 9 drives the crankshaft 19 on the pressure structure to rotate through the driving pulley 22, the belt, and the driven pulley 23. The crankshaft 19 drives the crankshaft 19 of the pressurizing structure to rotate synchronously through the connecting structure. The crankshaft 19 drives the piston 18 to slide along the cylinder 17 through the connecting rod 20, thereby realizing providing pressure for the pressure pipe 15. Through the setting of the check valve, the polymer in the feed pipe 14 flows into the pressure pipe 15 through the one-way pipe 16 and the check valve, and then flows into the discharge pipe 13 through the pressure pipe 15, the one-way pipe 16, and the check valve, and then flows into the injection pipeline, realizing the polymer injection.

Claims

1. A high-pressure polymer injection skid-mounted device for oil fields, comprising a container, wherein a polymer injection pump (2) is arranged inside the container, an inlet liquid pipeline is connected to the input end of the polymer injection pump (2), and an injection pipeline is connected to the output end of the polymer injection pump (2); characterized in that: A lubricating pump (7) is also provided inside the container, and the lubricating pump (7) is connected to the polymer injection pump (2); a connecting pipe (6) is connected to the liquid inlet pipeline, the other end of the connecting pipe (6) is connected to the injection pipeline, and a valve is provided on the connecting pipe (6); an electromagnetic flowmeter (5) is provided on the injection pipeline, and valves are provided on both sides of the electromagnetic flowmeter (5).

2. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 1, characterized in that: Pressure transmitters (4) are provided on both the liquid inlet pipeline and the injection pipeline. The pressure transmitter (4) on the injection pipeline is arranged between the valve on one side of the electromagnetic flowmeter (5) and the connecting pipe (6); a silencing check valve is also provided on the injection pipeline, and the silencing check valve is arranged between the valve on the other side of the electromagnetic flowmeter (5) and the electromagnetic flowmeter (5).

3. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 1, characterized in that: The polymer injection pump (2) includes a bottom plate (8) connected to the container, and a transmission box (10) is fixedly connected to the bottom plate (8); a pressure structure is provided inside the transmission box (10), and a plurality of pressurizing structures are provided on one side of the pressure structure; a connecting structure is provided between the pressure structure and the adjacent pressurizing structure, and between adjacent pressurizing structures. A driving structure is also provided inside the transmission box (10), and the driving structure can drive the plurality of connecting structures to act in sequence.

4. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 3, wherein: A feed pipe (14) and a discharge pipe (13) are fixedly connected to the transmission box (10), the lubricating pump (7) is connected to the discharge pipe (13), and a pressure pipe (15) is also fixedly connected inside the transmission box (10). The pressure structure and the pressurizing structure are both connected to the pressure pipe (15); a plurality of one-way pipes (16) are connected to both the feed pipe (14) and the discharge pipe (13), the other ends of the plurality of one-way pipes (16) are all communicated with the pressure pipe (15), and one-way valves are provided inside the plurality of one-way pipes (16).

5. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 4, characterized in that: Both the pressure structure and the pressurizing structure include a crankshaft (19) rotatably connected to the transmission box (10), and a connecting rod (20) is rotatably connected to the crankshaft (19); a piston (18) is rotatably connected to the connecting rod (20), and a plurality of cylinders (17) are fixedly connected to the pressure pipe (15), and the piston (18) is slidably connected to the cylinder (17).

6. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 3, characterized in that: The connecting structure includes a spline shaft (31) connected to the drive shafts of the pressure structure and the pressurizing structure. A spline cylinder (33) is slidably connected to the spline shaft (31); a main clutch block (35) is fixedly connected to the spline cylinder (33), and a driven clutch block (36) cooperating with the main clutch block (35) is also connected to the drive shaft of the pressurizing structure.

7. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 6, characterized in that: A worm (28) is rotatably connected inside the transmission box (10), and a worm gear (29) is engaged with the worm (28); a crank (30) is coaxially fixedly connected to the worm gear (29), a connecting rod (32) is rotatably connected to the crank (30), a traction cylinder (34) slidably connected to the transmission box (10) is rotatably connected to the connecting rod (32), and the spline cylinder (33) is rotatably connected to the traction cylinder (34).

8. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 7, characterized in that: The driving structure includes a driving wheel (25) rotatably connected to a transmission case (10), and a rack (27) is slidably connected in the transmission case (10) and meshes with a plurality of driving wheels (25) in sequence; a large bevel gear (37) is coaxially and fixedly connected to the driving wheel (25), and a small bevel gear (38) coaxially and fixedly connected to a worm (28) meshes with the large bevel gear (37).

9. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 8, characterized in that: An adjustment motor (21) is fixedly connected in the transmission case (10), and an output end of the adjustment motor (21) is connected to an adjustment screw rod (24); a safety component is connected to the adjustment screw rod (24), a slider (26) slidably connected to the transmission case (10) is connected to the safety component, and the slider (26) is fixedly connected to the rack (27).

10. The oilfield high-pressure polymer injection skid-mounted equipment according to claim 9, characterized in that: The safety component includes a rotating cylinder (43) screwed to the adjustment screw rod (24), and the rotating cylinder (43) is rotatably connected to the slider (26); a guiding block (40) is fixedly connected to the slider (26), and a guiding rod (46) is slidably connected to the guiding block (40); a plugging block (45) is fixedly connected to the guiding rod (46), and a plugging groove cooperating with the plugging block (45) is arranged on the rotating cylinder (43); a top spring (47) acting on the plugging block (45) is sleeved on the guiding rod (46), and the top spring (47) is arranged between the guiding block (40) and the plugging block (45); a driving block (41) perpendicular to the moving direction of the guiding rod (46) is slidably connected to the guiding block (40), a V-shaped groove (42) is arranged on the driving block (41), and a pin shaft (44) cooperating with the V-shaped groove (42) is arranged on the plugging block (45); a pair of stop blocks (39) are fixedly connected in the transmission case (10), and the pair of stop blocks (39) are respectively arranged at two ends of the adjustment screw rod (24).

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