A kind of oilfield high-pressure polymer injection skid-mounted equipment

Abstract

The present application belongs to the technical field of oilfield polymer injection equipment, and particularly relates to an oilfield high-pressure polymer injection skid-mounted equipment, which comprises a container, a polymer injection pump arranged in the container, a liquid inlet pipeline connected to an input end of the polymer injection pump, and an injection pipeline connected to an output end of the polymer injection pump; a lubricating pump is further arranged in the container and connected to the polymer injection pump; a communication pipe is connected to the liquid inlet pipeline, another end of the communication pipe is connected to the injection pipeline, and a valve is arranged on the communication pipe; an electromagnetic flowmeter is arranged on the injection pipeline, and valves are arranged on both sides of the electromagnetic flowmeter; the present application effectively solves the problem of small space of an existing offshore oil platform, which affects oilfield recovery efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oilfield polymer injection equipment, and particularly relates to an oilfield high-pressure polymer injection skid-mounted equipment. BACKGROUND

[0002] Polymer flooding refers to a stimulation measure of injecting polymers into a formation to displace oil. Macroscopically, it mainly relies on increasing the viscosity of the displacement fluid and reducing the mobility ratio of the displacement fluid and the displaced fluid, thereby expanding the swept volume; microscopically, the polymer, due to its inherent viscoelasticity, produces a stretching effect on the oil film or oil droplets during the flow process, thereby increasing the carrying capacity and improving the micro-washing efficiency.

[0003] High-pressure polymer injection in oilfields is a technology for improving the recovery of crude oil in oilfield development, and the core thereof is to inject polymer solution into an oil layer through high pressure to optimize the oil displacement effect; the tertiary oil recovery technology for land oilfields is relatively mature at present, but the tertiary oil recovery for offshore oilfields is still in the exploratory development stage.

[0004] In the development and application process of the tertiary oil recovery in offshore heavy oil fields, the polymer injection and distribution station and the gap liquid distribution mode applied to land oilfields have problems such as large occupied area, long construction period, and complex operation and maintenance, which makes it difficult to be popularized and applied on offshore oil platforms, and restricts the improvement of the recovery rate of offshore oilfields; therefore, there is an urgent need for a skid-mounted design of the oilfield high-pressure polymer injection skid-mounted equipment, which is integrated, has small overall occupied area, and is convenient to move. SUMMARY

[0005] In view of the above problems, the present application provides an oilfield high-pressure polymer injection skid-mounted equipment to effectively solve the problem of small space on the offshore oil platform and affect the oilfield recovery rate.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: an oilfield high-pressure polymer injection skid-mounted equipment, comprising a container, an injection polymer pump is arranged in the container, an input end of the injection polymer pump is connected with a liquid inlet pipeline, and an output end of the injection polymer pump is connected with an injection pipeline; a lubricating pump is further arranged in the container and connected with the injection polymer pump; a communication pipe is connected to the liquid inlet pipeline, another end of the communication pipe is connected with the injection pipeline, and a valve is arranged on the communication pipe; an electromagnetic flowmeter is arranged on the injection pipeline, and valves are arranged on both sides of the electromagnetic flowmeter.

[0007] Further, pressure transmitters are arranged on the liquid inlet pipeline and the injection pipeline, the pressure transmitter arranged on the injection pipeline is arranged between the valve on one side of the electromagnetic flowmeter and the communication pipe; a sound-attenuating check valve is further arranged on the injection pipeline and arranged between the valve on the other side of the electromagnetic flowmeter and the electromagnetic flowmeter.

[0008] Further, the injection pump comprises a bottom plate connected with the container, and a transmission box is fixedly connected to the bottom plate; a pressure structure is arranged in the transmission box, and a plurality of pressurizing structures are arranged on one side of the pressure structure; a connecting structure is arranged between the pressure structure and the adjacent pressurizing structure and between the adjacent pressurizing structures, and a driving structure is further arranged in the transmission box, which can drive the plurality of connecting structures to act in sequence.

[0009] Further, a feeding pipe and a discharging pipe are fixedly connected to the transmission box, a lubricating pump is connected to the discharging pipe, a pressure pipe is further fixedly connected to the transmission box, and the pressure structure and the pressurizing structure are connected with the pressure pipe; a plurality of one-way pipes are connected to the feeding pipe and the discharging pipe, the other ends of the plurality of one-way pipes are communicated with the pressure pipe, and a one-way valve is arranged in each of the plurality of one-way pipes.

[0010] Further, the pressure structure and the pressurizing structure each comprise a crankshaft rotatably connected with 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 with the cylinders.

[0011] Further, the connecting structure comprises a spline shaft connected with the driving shaft of the pressure structure and the driving shaft of the pressurizing structure, a spline barrel is slidably connected to the spline shaft; a driving clutch block is fixedly connected to the spline barrel, and a driven clutch block matched with the driving clutch block is further connected to the driving shaft of the pressurizing structure.

[0012] Further, a worm is rotatably connected to the transmission box, and a worm wheel is engaged with the worm; a crank is coaxially fixedly connected to the worm wheel, a connecting rod is rotatably connected to the crank, a traction barrel slidably connected with the transmission box is rotatably connected to the connecting rod, and the spline barrel is rotatably connected with the traction barrel.

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

[0014] Further, an adjusting motor is fixedly connected to the transmission box, and an adjusting screw is connected to the output end of the adjusting motor; a safety assembly is connected to the adjusting screw, a sliding block slidably connected with the transmission box is connected to the safety assembly, and the sliding block is fixedly connected with the rack.

[0015] Further, the safety assembly comprises a rotating drum screwed with the adjusting screw rod, the rotating drum is rotationally connected with the sliding block, a guide block is fixedly connected on the sliding block, a guide rod is slidably connected on the guide block, a plug-in block is fixedly connected on the guide rod, a plug-in slot matched with the plug-in block is arranged on the rotating drum, a top spring acting on the plug-in block is sleeved on the guide rod, the top spring is arranged between the guide block and the plug-in block, a driving block perpendicular to the movement direction of the guide rod is slidably connected on the guide block, a V-shaped slot is arranged on the driving block, a pin shaft matched with the V-shaped slot is arranged on the plug-in block, a pair of stop blocks are fixedly connected in the transmission box, and the pair of stop blocks are arranged at the two ends of the adjusting screw rod.

[0016] Compared with the prior art, the application has the advantages and beneficial effects that:

[0017] 1、The application has high integration, small overall land occupation, and convenient movement, and improves the application advantage in offshore oilfield application.

[0018] 2、The application can realize one pump with multiple cylinders (3 cylinders, 5 cylinders) free switching, mechanical control, can adapt to small displacement injection working condition, can adapt to large displacement injection working condition, and has wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the application;

[0020] Figure 2 It is a structural schematic view of the application;

[0021] Figure 3 It is a structural schematic view of the application;

[0022] Figure 4 It is a structural schematic view of the application;

[0023] Figure 5 It is a structural schematic view of the application;

[0024] Figure 6 It is a structural schematic view of the application;

[0025] Figure 7 It is a structural schematic view of the application;

[0026] Figure 8 It is a structural schematic view of the application;

[0027] Figure 9 This is a schematic diagram showing the engagement state of the rotating cylinder, plug-in block, guide block, and other structures in this invention.

[0028] In the diagram: 1. Control cabinet, 2. Polymer injection pump, 3. Pulse damper, 4. Pressure transmitter, 5. Electromagnetic flowmeter, 6. Connecting pipe, 7. Lubrication pump, 8. Base plate, 9. Polymer injection motor, 10. Transmission box, 11. Discharge flange, 12. Inlet flange, 13. Discharge pipe, 14. Inlet pipe, 15. Pressure pipe, 16. One-way pipe, 17. Cylinder, 18. Piston, 19. Crankshaft, 20. Connecting rod, 21. Adjusting motor, 22. Driving pulley, 23. Driven pulley, 24. 25. Adjusting screw, 26. Driving wheel, 27. Slider, 28. Rack, 29. Worm gear, 30. Worm wheel, 31. Crank, 32. Splined shaft, 33. Connecting rod, 34. Splined cylinder, 35. Traction cylinder, 36. Driving clutch block, 37. Driven clutch block, 38. Large bevel gear, 39. Small bevel gear, 40. Stop block, 41. Guide block, 42. Drive block, 43. V-groove, 44. Rotary cylinder, 45. Pin, 46. Insertion block, 47. Guide rod, 48. Top spring. Detailed Implementation

[0029] A skid-mounted high-pressure polymer injection equipment for oil fields, such as Figures 1-9 As shown, the system includes a container, inside which is installed a polymer injection pump 2. The input end of the polymer injection pump 2 is connected to an inlet pipeline, and the output end of the polymer injection pump 2 is connected to an injection pipeline. The inlet pipeline is connected to a curing tank, and the injection pipeline is connected to the wellhead. That is, through the polymer injection pump 2 inside the container, the polymer that has been cured in the curing tank is injected into the oil well through the injection pipeline. The container is also equipped with a lubrication pump 7, which is connected to the polymer injection pump 2. When the polymer injection pump 2 is running at low frequency, the lubrication pump 7 lubricates the polymer injection pump 2 to ensure its normal operation.

[0030] The inlet pipe is connected to a connecting pipe 6, the other end of which is connected to the injection pipe. A valve is provided on the connecting pipe 6. An electromagnetic flow meter 5 is provided on the injection pipe, and valves are provided on both sides of the electromagnetic flow meter 5. The valves are preferably plug valves. A pulse damper 3 is also provided on the injection pipe. The pulse damper 3 is located between the injection pump 2 and the connecting pipe 6 to eliminate pressure pulsation (fluctuation) in the injection pipe and stabilize the pipe pressure within a certain range.

[0031] The container is also equipped with a frequency converter control cabinet 1, which contains a frequency converter to control the polymer injection pump 2 and the electromagnetic flow meter 5; the container is also equipped with a PLC control cabinet 1 to control the polymer maturation stage, so that the polymer maturation and polymer injection are linked, thereby improving the convenience of this application.

[0032] Further, the liquid inlet pipeline and the injection pipeline are both provided with pressure transmitters 4, the pressure transmitter 4 on the injection pipeline is arranged between the valve on one side of the electromagnetic flowmeter 5 and the communication pipe 6; the injection pipeline is further provided with a sound-attenuating check valve, which is arranged between the valve on the other side of the electromagnetic flowmeter 5 and the electromagnetic flowmeter 5.

[0033] Further, the polymer injection pump 2 comprises a bottom plate 8 connected with the container, and the bottom plate 8 is fixedly connected with a transmission box 10; the transmission box 10 is provided with a pressure structure, one side of the pressure structure is provided with a plurality of pressurizing structures; the pressure structure and the adjacent pressurizing structures and the adjacent pressurizing structures are both provided with connecting structures, and the transmission box 10 is further provided with a driving structure, which can drive the plurality of connecting structures to act in sequence.

[0034] The polymer injection pump 2 can realize one pump with multiple cylinders (3 cylinders, 5 cylinders) free switching, mechanical control, and can not only adapt to small displacement injection working conditions, but also adapt to large displacement injection working conditions, so that the application range is wide.

[0035] Further, as shown in Figure 3 and Figure 4 , the transmission box 10 is fixedly connected with a feed pipe 14 and a discharge pipe 13, the lubricating pump 7 is connected with the discharge pipe 13, and the transmission box 10 is further fixedly connected with a pressure pipe 15, and the pressure structure and the pressurizing structure are both connected with the pressure pipe 15; the feed pipe 14 is provided with a feed flange 12, and the discharge pipe 13 is provided with a discharge flange 11; the feed pipe 14 is connected with the liquid inlet pipeline through the feed flange 12, and the discharge pipe 13 is connected with the injection pipeline through the discharge flange 11; the feed pipe 14 and the discharge pipe 13 are both connected with a plurality of one-way pipes 16, the other ends of the plurality of one-way pipes 16 are both communicated with the pressure pipe 15, and the plurality of one-way pipes 16 are both provided with one-way valves; under the action of the pressure structure and the pressurizing structure, the polymer in the feed pipe 14 flows into the pressure pipe 15 through the one-way pipe 16 and the one-way valve, and then flows into the discharge pipe 13 through the pressure pipe 15, the one-way pipe 16 and the one-way valve, and further flows into the injection pipeline.

[0036] Further, the pressure structure and the pressurizing structure both comprise a crankshaft 19 rotationally connected with the transmission box 10, the crankshaft 19 rotationally connecting a connecting rod 20; the connecting rod 20 rotationally connecting a piston 18, the pressure pipe 15 fixedly connecting a plurality of cylinders 17, the piston 18 slidingly connecting with the cylinder 17; preferably, the crankshaft 19 of the pressure structure connecting three sets of connecting rods 20, the three sets of connecting rods 20 connecting the cylinders 17 respectively, realizing that when the crankshaft 19 of the pressure structure rotates, it is equivalent to a three-cylinder injection pump 2 (small displacement); the bottom plate 8 fixedly connecting an injection motor 9, the output end of the injection motor 9 connecting a driving pulley 22; the crankshaft 19 of the pressure structure fixedly connecting the driving pulley 22, the driving pulley 22 being provided with a belt driving the driven pulley 23 to rotate.

[0037] When the pressure structure and the pressurizing structure are used, the injection motor 9 is started, the 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 and realizing injection of the polymer.

[0038] Further, as shown in Figure 5 and Figure 6 The connecting structure comprises a spline shaft 31 connected with the driving shaft of the pressure structure and the driving shaft of the pressurizing structure, the spline shaft 31 slidingly connecting a spline barrel 33; the spline barrel 33 fixedly connecting a driving clutch block 35, the driving shaft of the pressurizing structure further connecting a driven clutch block 36 matched with the driving clutch block 35; by sliding the spline barrel 33 along the spline shaft 31, the separation and meshing of the driving clutch block 35 and the driven clutch block 36 are realized, the separation and connection of the pressure structure and the pressurizing structure are realized, and the separation and connection between adjacent pressurizing structures are realized.

[0039] Further, the transmission box 10 rotationally connecting a worm 28, the worm 28 meshing with a worm wheel 29; the worm wheel 29 coaxially fixedly connecting a crank 30, the crank 30 rotationally connecting a connecting rod 32, the connecting rod 32 rotationally connecting a traction barrel 34 slidingly connected with the transmission box 10, the spline barrel 33 rotationally connecting with the traction barrel 34.

[0040] When the driving clutch block 35 needs to be separated 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 30 slider 26 mechanism, so that 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, and the spline cylinder 33 drives the driving clutch block 35 to move linearly, thereby realizing the separation or engagement of the driving 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 stability of the connection between the driving clutch block 35 and the driven clutch block 36.

[0041] Further, the driving structure includes a driving wheel 25 rotationally connected with the transmission box 10, and a rack 27 slidably connected in the transmission box 10 and sequentially engaged with a plurality of driving wheels 25 for transmission; the driving wheel 25 is coaxially fixed with a large bevel gear 37, the large bevel gear 37 is engaged with a small bevel gear 38 coaxially fixed with the worm 28, and the transmission ratio of the large bevel gear 37 and the small bevel gear 38 is 2:1.

[0042] By sliding the rack 27 along the transmission box 10, the rack 27 is sequentially engaged with a plurality of driving wheels 25 on the movement route of the rack 27; when the rack 27 slides along the transmission box 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 box 10, a plurality of driving wheels 25 are sequentially driven to move, and a plurality of pressurizing structures are sequentially connected to improve the stability of the pressurizing structure.

[0043] Further, as shown in Figure 5 , 7 -9, the transmission box 10 is fixedly connected with an adjusting motor 21, and the output end of the adjusting motor 21 is connected with an adjusting screw 24; the adjusting screw 24 is connected with a safety assembly, the safety assembly is connected with a sliding block 26 slidably connected with the transmission box 10, and the sliding block 26 is fixedly connected with the rack 27; the adjusting motor 21 drives the adjusting screw 24 to rotate, the adjusting screw 24 cooperates with the safety assembly to drive the sliding block 26 to slide along the transmission box 10, and the sliding block 26 drives the rack 27 to move.

[0044] Further, the safety assembly comprises a rotating drum 43 screwed with the adjusting screw rod 24, the rotating drum 43 is rotationally connected with the sliding block 26; the sliding block 26 is fixedly connected with a guide block 40, the guide block 40 is slidingly connected with a guide rod 46; the guide rod 46 is fixedly connected with a plug-in block 45, the rotating drum 43 is provided with a plug-in groove matched with the plug-in block 45; the guide rod 46 is sleeved with a compression spring 47 acting on the plug-in block 45, the compression spring 47 is arranged between the guide block 40 and the plug-in block 45; the guide block 40 is slidingly connected with a driving block 41 perpendicular to the movement direction of the guide rod 46, the driving block 41 is provided with a V-shaped groove 42, the plug-in block 45 is provided with a pin shaft 44 matched with the V-shaped groove 42; the transmission box 10 is fixedly connected with a pair of stop blocks 39, the pair of stop blocks 39 are respectively arranged at the two ends of the adjusting screw rod 24.

[0045] The safety assembly is used as shown in Figure 8 and Figure 9 The plug-in block 45 is connected with the plug-in groove, and the rotating drum 43 and the sliding block 26 are relatively fixed under the action of the plug-in block 45, the plug-in groove, the guide rod 46 and the guide block 40; when the adjusting screw rod 24 rotates, the adjusting screw rod 24 drives the rotating drum 43, the plug-in block 45 and the sliding block 26 to slide along the transmission box 10 as a whole due to the screw connection between the rotating drum 43 and the adjusting screw rod 24; when the driving block 41 contacts the stop block 39, the driving block 41 slides along the guide block 40 under the action of the stop block 39, the driving block 41 drives the plug-in block 45 to move away from the plug-in groove by matching the pin shaft 44 on the plug-in block 45 with the V-shaped groove 42, until the plug-in block 45 is separated from the plug-in groove; the adjusting screw rod 24 can drive the rotating drum 43 to rotate synchronously when the adjusting screw rod 24 rotates, so that the sliding block 26 remains stationary relative to the transmission box 10.

[0046] As described above, the safety assembly can avoid the sliding block 26 from continuously sliding along the transmission box 10 under the action of the adjusting screw rod 24 until colliding with the bearing seat supported by the adjusting screw rod 24, thereby preventing damage to the sliding block 26 and the adjusting screw rod 24 and improving the stability of the application.

[0047] As shown in Figures 1 to 9 , the working process of the application will be explained in detail.

[0048] In use, the injection polymer pump 2 in the container injects the polymer matured in the maturation tank into the oil well through the injection pipeline; specifically, the driving structure is operated according to the required displacement of the injection polymer pump 2, so that the driving structure drives the connecting mechanism in sequence, the pressure structure is connected with the pressure structure, and the adjacent pressure structures are connected to change the displacement of the injection polymer pump 2; as shown in Figures 3-5 , at this time, the injection polymer pump 2 has the maximum displacement, that is, the pressure structure is connected with the pressure structure, and the adjacent pressure structures are connected with each other.

[0049] When it is necessary to reduce the displacement of the polymer injection pump 2, the adjusting motor 21 is started, and the adjusting motor 21 drives the adjusting screw 24 to rotate; the adjusting screw 24 cooperates with the safety assembly to drive the sliding block 26 to slide along the transmission box 10, and the sliding block 26 drives the rack 27 to move; the rack 27 is in meshing transmission with a plurality of driving wheels 25 along the movement route of the rack 27 in sequence, and the rack 27 drives the driving wheels 25 to rotate; the driving wheels 25 drive the large bevel gears 37 to rotate, the large bevel gears 37 drive the small bevel gears 38 to rotate, and the small bevel gears 38 drive the worm gears 28 to rotate; the worm gears 28 drive the cranks 30 to rotate through the worm wheels 29, and since the cranks 30, the connecting rods 32 and the traction cylinders 34 constitute the crank 30 sliding block 26 mechanism, the cranks 30 drive the traction cylinders 34 to slide along the transmission box 10 through the connecting rods 32, the traction cylinders 34 drive the spline cylinders 33 to move linearly, the spline cylinders 33 drive the driving and driven clutch blocks 35 to move linearly, and the separation of the driving and driven clutch blocks 35 is realized; the rack 27 continuously slides along the gear box, and then the pressurizing structures are separated from each other, and the pressurizing structures are separated from the pressure structure, and then the displacement of the polymer injection pump 2 is reduced.

[0050] When the polymer is injected, the polymer injection motor 9 is started, 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 synchronously drives the crankshaft 19 of the pressurizing structure through the connecting structure; the crankshaft 19 drives the piston 18 to slide along the cylinder 17 through the connecting rod 20, and then the pressure is provided for the pressure pipe 15; through the setting of the one-way valve, the polymer in the feeding pipe 14 flows into the pressure pipe 15 through the one-way pipe 16 and the one-way valve, and then flows into the discharging pipe 13 through the pressure pipe 15, the one-way pipe 16 and the one-way valve, and then flows into the injection pipeline, and the polymer injection is realized.

Claims

1. An oilfield high-pressure polymer injection skid-mounted device, comprising a container, a polymer injection pump (2) is arranged in the container, a liquid inlet pipeline is connected to an input end of the polymer injection pump (2), and an injection pipeline is connected to an output end of the polymer injection pump (2); characterized in that: The container is also provided with a lubricating pump (7) connected with the injection pump (2); the liquid inlet pipeline is connected with a communication pipe (6), one end of the communication pipe (6) is connected with the injection pipeline, and the communication pipe (6) is provided with a valve; the injection pipeline is provided with an electromagnetic flowmeter (5), and the electromagnetic flowmeter (5) is provided with a valve on both sides. The injection pump (2) comprises a bottom plate (8) connected with the container, and the bottom plate (8) is fixedly connected with a transmission box (10); the transmission box (10) is provided with a pressure structure, and a plurality of pressurizing structures are arranged on one side of the pressure structure; the pressure structure and the adjacent pressurizing structures and the adjacent pressurizing structures are provided with connecting structures, and the transmission box (10) is also provided with a driving structure, and the driving structure can drive the plurality of connecting structures to act in sequence. The connecting structure comprises a spline shaft (31) connected with the driving shaft of the pressure structure and the driving shaft of the pressurizing structure, and the spline shaft (31) is slidably connected with a spline barrel (33); the spline barrel (33) is fixedly connected with a driving clutch block (35), and the driving shaft of the pressurizing structure is also connected with a driven clutch block (36) matched with the driving clutch block (35). The transmission box (10) is rotatably connected with a worm (28), and the worm (28) is meshed with a worm wheel (29); the worm wheel (29) is coaxially fixedly connected with a crank (30), the crank (30) is rotatably connected with a connecting rod (32), the connecting rod (32) is rotatably connected with a traction barrel (34) slidably connected with the transmission box (10), and the spline barrel (33) is rotatably connected with the traction barrel (34). The driving structure comprises a driving wheel (25) rotatably connected with the transmission box (10), and a rack (27) slidably connected in the transmission box (10) is meshed with a plurality of driving wheels (25) in sequence; the driving wheel (25) is coaxially fixedly connected with a large bevel gear (37), and the large bevel gear (37) is meshed with a small bevel gear (38) coaxially fixed with the worm (28); The transmission box (10) is fixedly connected with an adjusting motor (21), and an output end of the adjusting motor (21) is connected with an adjusting screw (24); the adjusting screw (24) is connected with a safety assembly, the safety assembly is connected with a sliding block (26) slidably connected with the transmission box (10), and the sliding block (26) is fixedly connected with the rack (27).

2. The oilfield high pressure polymer injection skid of claim 1, wherein: The liquid inlet pipeline and the injection pipeline are both provided with a pressure transmitter (4), the pressure transmitter (4) on the injection pipeline is arranged between the valve on one side of the electromagnetic flowmeter (5) and the communication pipe (6); the injection pipeline is also provided with a sound-absorbing check valve, and the sound-absorbing 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 of claim 1, wherein: The transmission case (10) is fixed with a feeding pipe (14) and a discharging pipe (13), the lubricating pump (7) is connected with the discharging pipe (13), the transmission case (10) is further fixed with a pressure pipe (15), the pressure structure and the pressurizing structure are connected with the pressure pipe (15); the feeding pipe (14) and the discharging pipe (13) are connected with a plurality of one-way pipes (16), the other ends of the plurality of one-way pipes (16) are communicated with the pressure pipe (15), and the plurality of one-way pipes (16) are provided with one-way valves.

4. The oilfield high pressure polymer injection skid of claim 3, wherein: The pressure structure and the pressurizing structure both comprise a crankshaft (19) rotatably connected with the transmission case (10), and a connecting rod (20) rotatably connected with the crankshaft (19); the connecting rod (20) is rotatably connected with a piston (18), the pressure pipe (15) is fixed with a plurality of cylinders (17), and the piston (18) is slidably connected with the cylinders (17).

5. The oilfield high pressure polymer injection skid of claim 1, wherein: The safety assembly comprises a rotating drum (43) screwed with the adjusting screw rod (24), and the rotating drum (43) is rotatably connected with a sliding block (26); the sliding block (26) is fixed with a guide block (40), and the guide block (40) is slidably connected with a guide rod (46); the guide rod (46) is fixed with a plug-in block (45), and the rotating drum (43) is provided with a plug-in groove matched with the plug-in block (45); the guide rod (46) is sleeved with a compression spring (47) acting on the plug-in block (45), and the compression spring (47) is arranged between the guide block (40) and the plug-in block (45); the guide block (40) is slidably connected with a driving block (41) perpendicular to the movement direction of the guide rod (46), the driving block (41) is provided with a V-shaped groove (42), and the plug-in block (45) is provided with a pin shaft (44) matched with the V-shaped groove (42); the transmission case (10) is fixed with a pair of stop blocks (39), and the pair of stop blocks (39) are arranged at the two ends of the adjusting screw rod (24) respectively.

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