Oil field polymer injection device

Abstract

The invention relates to the technical field of oilfield exploitation, in particular to an oilfield polymer injection device. The oil field polymer injection device comprises a raw material pressurization system which comprises at least one raw material pressurization cylinder, the raw material pressurization cylinder is internally provided with a first pressurization cavity, a pressurization piston and a second pressurization cavity, and the single-stroke time of the pressurization piston is longer than 9 seconds; the transmission connecting rod system comprises a plurality of rod units, and the pressurizing piston is connected with the plurality of rod units; the hydraulic system comprises a plurality of hydraulic pressure cylinders, each hydraulic pressure cylinder is internally provided with a left cavity, a hydraulic piston and a right cavity, the hydraulic pistons are in sealing sliding fit with the inner walls of the hydraulic pressure cylinders, the hydraulic system is connected with the transmission connecting rod system and provides power for the transmission connecting rod system, and the hydraulic pistons are connected with a plurality of rod units; the raw material supply system is configured to provide a polymer to the first pressurizing cavity and the second pressurizing cavity; the oil field polymer injection device can effectively reduce the shearing force borne by the polymer, and meanwhile the working scheme is more diversified.

Description

[0001] This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on December 4, 2023, with application number 202311648288.9 and application name “A Type of Oilfield Injection Device”, all contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the technical field of oilfield exploitation, and in particular to an oilfield polymer injection device. Background Art

[0003] In the middle and late stages of oilfield development, secondary oil recovery technology can no longer meet oil recovery requirements, and tertiary oil recovery technology is gradually being used, among which polymer flooding is currently the most widely used oil recovery technology. The quality of the polymer injection process is mainly determined by the properties of the polymer and the polymer injection pump, which is the key equipment for polymer flooding.

[0004] At present, plunger pumps are usually used as injection pumps. Plunger pumps achieve oil suction and discharge by changing the sealed working volume when the plunger reciprocates in the plunger hole. According to the arrangement direction of the plunger, it is divided into two categories: axial plunger pumps and radial plunger pumps. A radial plunger pump is a plunger pump in which the reciprocating direction of the piston or plunger is perpendicular to the drive shaft, and an axial plunger pump is a plunger pump in which the reciprocating direction of the piston or plunger is parallel to the center axis of the cylinder.

[0005] When the plunger pump is working, the cam on the injection pump camshaft and the plunger spring force the plunger to reciprocate up and down, thereby completing the oil pumping task. The oil pumping process can be divided into the following two stages, namely the oil inlet process and the oil outlet process. Oil inlet process: When the raised part of the cam moves from the near point to the far point, the plunger moves to the left, a vacuum is generated in the plunger chamber, the upper outlet spring ball valve is quickly closed under the action of the spring force, and the lower inlet spring ball valve is quickly opened under the action of the spring force. The liquid filled in the pipeline enters the plunger chamber through the lower inlet spring ball valve, and the plunger moves to the left stop point, and the oil inlet is completed. Oil return process: When the raised part of the cam moves from the far point to the near point, the plunger moves to the right, pressure is generated in the plunger chamber, the lower inlet spring ball valve is quickly closed under the action of the spring force, and the upper outlet spring ball valve is quickly opened under the action of the spring force. The liquid in the plunger chamber is pressurized and enters the external transmission pipeline through the upper outlet spring ball valve. The plunger moves to the right stop point and stops supplying oil. After that, the raised part of the cam moves from the near point to the far point, starting the next cycle. This working mode forms continuous oil supply after continuous movement.

[0006] However, the shear rate of the hydraulic end of a conventional plunger pump on the polymer is greater than 3%, which does not meet the polymer pressurization requirements. Summary of the invention

[0007] In order to solve the problems mentioned in the background technology, an embodiment of the present application provides an oilfield polymer injection device, which pressurizes the raw material liquid (polymer) through a raw material boosting cylinder. The raw material liquid (polymer) in the first boosting chamber or the second boosting chamber is squeezed once by the boosting piston and flows out of the raw material boosting cylinder, thereby effectively avoiding the influence of the mechanical strong shearing of the high-speed rotation of the existing pump on the destruction of the polymer structure. The spatial network structure of the raw material liquid (polymer) will not be destroyed, thereby ensuring the viscosity of the raw material liquid (polymer) and the oil recovery effect.

[0008] In order to achieve the above-mentioned purpose, the present application provides an oilfield polymer injection device, comprising:

[0009] A raw material boosting system, comprising at least one raw material boosting cylinder, wherein the raw material boosting cylinder has a first boosting chamber, a boosting piston and a second boosting chamber sequentially arranged along the axial direction, the boosting piston is in sealing and sliding cooperation with the inner wall of the raw material boosting cylinder, the single stroke time of the boosting piston is greater than 9 seconds, the raw material boosting cylinder is cylindrical, the diameter of the raw material boosting cylinder is greater than 300 mm, the length of the raw material boosting cylinder is greater than 3 times the diameter of the raw material boosting cylinder, and the speed of the boosting piston is 0.01 m / s-0.1 m / s;

[0010] A transmission connecting rod system, comprising a plurality of rod units, the boosting piston being connected to the plurality of rod units, and the transmission connecting rod system being configured to drive the boosting piston to reciprocate along the axial direction of the raw material boosting cylinder;

[0011] The hydraulic system includes a plurality of hydraulic booster cylinders, wherein the hydraulic booster cylinders have a left chamber, a hydraulic piston and a right chamber sequentially arranged along the axial direction, the hydraulic piston is in sealing and sliding cooperation with the inner wall of the hydraulic booster cylinder, the hydraulic system is connected to the transmission connecting rod system and provides power for the transmission connecting rod system, and the hydraulic piston is connected to a plurality of rod units;

[0012] a raw material supply system configured to supply polymer to the first pressurizing chamber and the second pressurizing chamber;

[0013] Among them, the structure of the hydraulic booster cylinder is the same as that of the raw material booster cylinder, and the size of the hydraulic booster cylinder and the raw material booster cylinder are the same;

[0014] The hydraulic boosting cylinders and the raw material boosting cylinders are arranged in at least one row. When the hydraulic boosting cylinders and the raw material boosting cylinders are arranged in one row, hydraulic boosting cylinders are respectively arranged on both sides of each raw material boosting cylinder.

[0015] In the above-mentioned oilfield polymer injection device, optionally, the hydraulic booster cylinders and the raw material booster cylinders are arranged in a row, and each raw material booster cylinder is coaxial with each hydraulic booster cylinder;

[0016] The axis of the rod unit is parallel to the axis of the raw material boosting cylinder, and each rod unit is respectively connected to each boosting piston and each hydraulic piston.

[0017] In the above-mentioned oilfield polymer injection device, optionally, the oilfield polymer injection device further includes a plurality of reversing valve groups, each raw material boosting cylinder and each hydraulic boosting cylinder is respectively provided with a corresponding reversing valve group.

[0018] The hydraulic system also includes a hydraulic oil supply pipeline and a hydraulic oil recovery pipeline. The left chamber and the right chamber are respectively connected to the corresponding reversing valve group and communicate with the hydraulic oil supply pipeline and the hydraulic oil recovery pipeline through the reversing valve group.

[0019] The first boost chamber and the second boost chamber are respectively connected to the corresponding reversing valve groups and communicate with the raw material supply system through the reversing valve groups to provide polymer to the outside.

[0020] In the above-mentioned oilfield polymer injection device, optionally, the oilfield polymer injection device further includes two steering switches, and each reversing valve group is electrically connected to the two steering switches respectively;

[0021] When the transmission link system moves to the first position, one of the steering switches transmits a signal to each reversing valve group, and when the transmission link system moves to the second position, the other steering switch transmits a signal to each reversing valve group.

[0022] In the above-mentioned oilfield polymer injection device, optionally, the number of the raw material boosting cylinder is one, and a hydraulic boosting cylinder is respectively provided on both sides of the raw material boosting cylinder;

[0023] Alternatively, the number of the raw material boosting cylinder is one, and a plurality of hydraulic boosting cylinders are respectively arranged on both sides of the raw material boosting cylinder, and the number of the hydraulic boosting cylinders on both sides of the raw material boosting cylinder is the same;

[0024] Alternatively, there are multiple raw material boosting cylinders, the number of hydraulic boosting cylinders is one more than the number of raw material boosting cylinders, the raw material boosting cylinders and the hydraulic boosting cylinders are arranged alternately, and hydraulic boosting cylinders are provided on both sides of each raw material boosting cylinder.

[0025] In the above-mentioned oilfield polymer injection device, optionally, the raw material boosting cylinder is provided with a first raw material inlet and a first raw material outlet communicated with the first boosting chamber, and a second raw material inlet and a second raw material outlet connected with the second boosting chamber;

[0026] The raw material supply system is respectively connected with the first raw material inlet and the second raw material inlet to provide polymer to the first pressurizing chamber and the second pressurizing chamber.

[0027] In the above-mentioned oil field polymer injection device, it is optional that the first raw material inlet and the first raw material outlet are respectively opened along the radial direction of the raw material boosting cylinder and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder, and the second raw material inlet and the second raw material outlet are respectively opened along the radial direction of the raw material boosting cylinder and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder.

[0028] In the above-mentioned oil field polymer injection device, it is optional that the hydraulic system at least includes a hydraulic oil supply pipeline, a hydraulic oil recovery pipeline, two hydraulic booster cylinders and two reversing valve groups, the rod unit includes a connecting rod, the connecting rod and the two hydraulic booster cylinders are coaxially arranged, and the connecting rod is located between the two hydraulic booster cylinders, the two ends of the connecting rod are respectively sealed and pass through the hydraulic booster cylinders and are fixedly connected to the hydraulic piston, the hydraulic booster cylinders and the reversing valve groups are arranged one by one, the left chamber and the right chamber are respectively connected to the corresponding reversing valve groups and are connected to the hydraulic oil supply pipeline and the hydraulic oil recovery pipeline through the reversing valve groups.

[0029] In the above-mentioned oil field polymer injection device, optionally, the reversing valve group diverts the hydraulic oil sent into the pipeline alternately to the left chamber and the right chamber, and the reversing valve group also diverts the hydraulic oil in the right chamber and the hydraulic oil in the left chamber alternately to the hydraulic oil recovery pipeline.

[0030] In the above-mentioned oil field injection device, optionally, the axis of the hydraulic booster cylinder is parallel to the axis of the raw material booster cylinder, the transmission connecting rod system also includes a transmission rod, and the rod unit also includes a driving rod, the transmission rod is arranged perpendicular to the connecting rod and is fixedly connected to the connecting rod, the driving rod is arranged parallel to the connecting rod, one end of the driving rod is connected to the transmission rod, and the other end of the driving rod is sealed and passes through the raw material booster cylinder and is fixedly connected to the booster piston.

[0031] In the above-mentioned oil field polymer injection device, it is optional that the raw material boosting system includes at least two raw material boosting cylinders, the two raw material boosting cylinders constitute a raw material boosting cylinder group, the two raw material boosting cylinders are symmetrically arranged on both sides of the transmission rod, the axes of the two raw material boosting cylinders are perpendicular to the transmission rod, and the boosting pistons in each raw material boosting cylinder are connected to the transmission rod through a driving rod respectively.

[0032] In the above-mentioned oilfield polymer injection device, optionally, the raw material pressurization system includes two raw material pressurization cylinder groups, and the two raw material pressurization cylinder groups are arranged at intervals along the length direction of the transmission rod.

[0033] In the above-mentioned oil field polymer injection device, optionally, the hydraulic system also includes a hydraulic oil compressor, a hydraulic oil buffer tank, a hydraulic oil filter and a hydraulic oil air cooling device connected in series, the hydraulic oil compressor is connected to the hydraulic oil supply pipeline, and the hydraulic oil air cooling device is connected to the hydraulic oil recovery pipeline.

[0034] In the above-mentioned oilfield polymer injection device, optionally, the first raw material inlet and the second raw material inlet are respectively equipped with feed check valves that only allow polymer to enter, and the first raw material outlet and the second raw material outlet are respectively equipped with discharge check valves that only allow polymer to flow out.

[0035] In the above-mentioned oilfield polymer injection device, optionally, the raw material supply system comprises at least a polymer storage tank and a polymer delivery pipeline, and the polymer storage tank is connected to the first raw material inlet and the second raw material inlet through the polymer delivery pipeline.

[0036] The oilfield polymer injection device provided by the present application utilizes the first boosting chamber and the second boosting chamber of the raw material boosting cylinder to alternately boost the raw material liquid (polymer), which can ensure that the raw material liquid flows continuously and reliably after being boosted. The raw material boosting cylinder boosts the raw material liquid (polymer), and the raw material liquid (polymer) in the first boosting chamber or the second boosting chamber is squeezed by the boosting piston once and flows out of the raw material boosting cylinder. The process time of the raw material boosting cylinder once entering or exiting the liquid is relatively long, which effectively avoids the influence of the mechanical strong shearing of the high-speed rotation of the pump on the destruction of the polymer structure. In addition, the structure of the hydraulic boosting cylinder is the same as that of the raw material boosting cylinder and the size is the same. The corresponding boosting cylinder can be set as a hydraulic boosting cylinder or a raw material boosting cylinder as needed, which is suitable for high pressure, high flow rate, low pressure, and low flow rate conditions, and is suitable for different boosting requirements for polymers. The working scheme is more diversified, which is conducive to improving the versatility of the oilfield polymer injection device. The size of the raw material boosting cylinder can ensure the single stroke time of the boosting piston, and the raw material boosting cylinder has a relatively long time for entering and exiting the liquid once, which weakens the influence of the frequent turning of the boosting piston on the shearing of the polymer. The hydraulic piston and the booster piston are respectively connected to a plurality of rod units, so that the hydraulic piston and the booster piston are evenly stressed and are not easily deformed. When the hydraulic booster cylinder and the raw material booster cylinder are arranged in a row, a hydraulic booster cylinder is provided on both sides of each raw material booster cylinder, so that the transmission connecting rod system is stressed on both sides of the raw material booster cylinder, which is beneficial to improve the service life of the transmission connecting rod system.

[0037] In addition to the technical problems solved by the embodiments of the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the oil field injection device provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of an oilfield polymer injection device provided in an embodiment of the present application;

[0040] Figure 2 Schematic diagram of the arrangement of the first raw material boosting cylinder and the hydraulic boosting cylinder provided in the embodiment of the present application Figure 1 ;

[0041] Figure 3 Schematic diagram of the arrangement of the first raw material boosting cylinder and the hydraulic boosting cylinder provided in the embodiment of the present application Figure 2 ;

[0042] Figure 4 A schematic diagram of the arrangement of the second raw material boosting cylinder and the hydraulic boosting cylinder provided in the embodiment of the present application;

[0043] Figure 5 A schematic diagram of the arrangement of the third type of raw material boosting cylinder and the hydraulic boosting cylinder provided in the embodiment of the present application;

[0044] Figure 6 A partial structural schematic diagram of a hydraulic system provided in an embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of a raw material supply system provided in an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the connection between the drive rod, the booster piston and the hydraulic piston provided in an embodiment of the present application;

[0047] Fig. 9 A schematic diagram of the structure of another oilfield polymer injection device provided in an embodiment of the present application;

[0048] Fig.10 A schematic diagram of another hydraulic system provided in an embodiment of the present application;

[0049] Fig.11 A schematic diagram of a boosting system provided in an embodiment of the present application;

[0050] Fig.12 A partial structural schematic diagram of a transmission connecting rod system provided in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 100. Oilfield polymer injection device;

[0053] 10. Raw material boosting system; 11. Raw material boosting cylinder; 111. First boosting chamber; 112. Boosting piston; 113. Second boosting chamber; 114. First raw material inlet; 115. First raw material outlet; 116. Second raw material inlet; 117. Second raw material outlet; 118. First piston ring; 1191. First liquid inlet and outlet; 1192. Second liquid inlet and outlet; 12. Feed check valve; 13. Discharge check valve;

[0054] 20. Transmission connecting rod system; 21. Transmission rod; 22. Rod unit; 221. Driving rod; 222. Connecting rod;

[0055] 30. Hydraulic system; 31. Hydraulic oil supply pipeline; 32. Hydraulic oil recovery pipeline; 34. Hydraulic booster cylinder; 341. Left chamber; 342. Hydraulic piston; 343. Right chamber; 344. Second piston ring; 345. Third inlet and outlet; 346. Fourth inlet and outlet; 35. Reversing valve group; 36. Hydraulic oil compressor; 37. Hydraulic oil buffer tank; 38. Hydraulic oil filter; 39. Hydraulic oil air cooling device;

[0056] 40. Raw material supply system; 41. Polymer storage tank; 42. Polymer delivery pipeline;

[0057] 51. First steering switch; 52. Second steering switch. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0061] The terms "first", "second" and "third" (if any) in the specification and claims of this application and the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0062] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0063] In the prior art, plunger pumps are usually used as injection pumps. Plunger pumps achieve oil suction and discharge by changing the sealed working volume when the plunger reciprocates in the plunger hole. When the plunger pump is working, under the action of the cam and the plunger spring, the plunger is forced to reciprocate up and down, thereby completing the oil pumping task. The oil pumping process can be divided into the following two stages. Oil inlet process: When the raised part of the cam moves from the near point to the far point, the plunger moves to the left, and a vacuum is generated in the plunger chamber. The upper liquid outlet spring ball valve is quickly closed under the action of the spring force, and the lower liquid inlet spring ball valve is quickly opened under the action of the spring force. The liquid filled in the pipeline enters the plunger chamber through the lower liquid inlet spring ball valve, and the plunger moves to the left stop point, and the oil inlet ends. Oil return process: When the raised part of the cam moves from the far point to the near point, the plunger moves to the right, pressure is generated in the plunger chamber, the lower inlet spring ball valve is quickly closed under the action of the spring force, and the upper outlet spring ball valve is quickly opened under the action of the spring force. The liquid in the plunger chamber is pressurized and enters the external transmission pipeline through the upper outlet spring ball valve. The plunger moves to the right stop point and stops supplying oil. After that, the raised part of the cam moves from the near point to the far point, starting the next cycle. This working mode forms continuous oil supply after continuous movement. However, the existing plunger pump uses a spring ball valve structure as a valve component. When the spring ball valve is opened, a spherical tangential microchannel is formed between the sphere and the cylindrical cavity, thereby realizing the entry and exit of the polymer. However, the spherical tangential microchannel will produce a shear force on the polymer. As the polymer flow rate increases, the shear force on the polymer becomes stronger, and it is impossible to achieve high-flow polymer pressurization; the valve cover of the spring ball valve adopts a porous structure. When the polymer flows through, the shear force of the porous structure on the polymer increases significantly, resulting in a decrease in the viscoelasticity of the polymer, affecting the oil displacement effect of the polymer; the plunger pump relies on the high-speed rotation of the cam to drive the plunger piston to circulate and reciprocate, and the piston drives the polymer in and out. The high-frequency reciprocating motion of the piston destroys the spatial network structure of the polymer, causing the polymer properties to change and reducing the oil displacement effect. The above reasons cause the shear rate of the hydraulic end of the conventional plunger pump to the polymer to be greater than 3%, which does not meet the polymer pressurization requirements.

[0064] After repeated thinking and verification, the inventor found that if the raw material booster cylinder is used to absorb and discharge the polymer, and the raw material booster cylinder is used to boost the polymer, the raw material booster cylinder is directly connected to the raw material supply system, and the booster piston in the raw material booster cylinder can achieve one of the two booster chambers of the raw material booster cylinder automatically absorbing the polymer when moving, and the other booster chamber automatically pressurizes the polymer and discharges the polymer. The booster piston is driven to move by the hydraulic system and the transmission connecting rod system to control the single stroke time of the booster piston. In this way, the large shear of the polymer caused by the spring ball valve can be avoided, and the influence of the mechanical strong shear caused by the high-speed rotation of the pump on the destruction of the polymer structure can be effectively avoided.

[0065] In view of this, the inventor has designed an oilfield polymer injection device, which absorbs polymers through a raw material boosting cylinder and discharges the polymers by boosting. The single stroke time of the boosting piston in the raw material boosting cylinder is greater than 9 seconds. The boosting piston is driven to move by a hydraulic system and a transmission connecting rod system, and polymers are supplied to the first boosting chamber and the second boosting chamber of the raw material boosting cylinder through a raw material supply system. Avoid a high shear rate on the polymer. In addition, the structure of the raw material boosting cylinder is the same as that of the hydraulic boosting cylinder of the hydraulic system. The corresponding boosting cylinder can be set as a hydraulic boosting cylinder or a raw material boosting cylinder as needed, which is suitable for different boosting requirements for polymers. The working scheme is more diversified, which is conducive to improving the versatility of the oilfield polymer injection device.

[0066] The technical solution of the oilfield polymer injection device provided in the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0067] Reference Figures 1 to 3 As shown, the oilfield polymer injection device 100 provided in the embodiment of the present application includes a raw material pressurizing system 10, a transmission connecting rod system 20, a hydraulic system 30 and a raw material supply system 40.

[0068] The raw material boosting system 10 includes at least one raw material boosting cylinder 11, and the raw material boosting cylinder 11 has a first boosting chamber 111, a boosting piston 112, and a second boosting chamber 113 arranged in sequence along the axial direction. The boosting piston 112 is sealed and slidably matched with the inner wall of the raw material boosting cylinder 11, and the single stroke time of the boosting piston 112 is greater than 9 seconds. The raw material boosting cylinder 11 is cylindrical, the diameter of the raw material boosting cylinder 11 is greater than 300mm, the length of the raw material boosting cylinder 11 is greater than 3 times the diameter of the raw material boosting cylinder 11, and the speed of the boosting piston 112 is 0.01m / s-0.1m / s.

[0069] The driving connecting rod system 20 includes a plurality of rod units 22 , and the boosting piston 112 is connected to the plurality of rod units 22 . The driving connecting rod system 20 is configured to drive the boosting piston 112 to reciprocate along the axial direction of the raw material boosting cylinder 11 .

[0070] The hydraulic system 30 includes a plurality of hydraulic booster cylinders 34, wherein the hydraulic booster cylinders 34 have a left chamber 341, a hydraulic piston 342, and a right chamber 343 sequentially arranged along the axial direction, and the hydraulic piston 342 is in sealing and sliding cooperation with the inner wall of the hydraulic booster cylinder 34. The hydraulic system 30 is connected to the transmission connecting rod system 20 and provides power for the transmission connecting rod system 20, and the hydraulic piston 342 is connected to the plurality of rod units 22.

[0071] The raw material supply system 40 is configured to supply polymer to the first pressurizing chamber 111 and the second pressurizing chamber 113 .

[0072] The structure of the hydraulic booster cylinder 34 is the same as that of the raw material booster cylinder 11, and the size of the hydraulic booster cylinder 34 is the same as that of the raw material booster cylinder 11. The hydraulic booster cylinder 34 and the raw material booster cylinder 11 are arranged in at least one row. When the hydraulic booster cylinder 34 and the raw material booster cylinder 11 are arranged in one row, a hydraulic booster cylinder 34 is provided on both sides of each raw material booster cylinder 11.

[0073] Exemplarily, the booster piston 112 may be a round pancake-shaped structure, whose shape and size are matched with the raw material booster cylinder 11. During the movement of the booster piston 112, the volume of one of the first booster chamber 111 and the second booster chamber 113 increases, and a negative pressure is formed in the booster chamber. The raw material liquid (polymer) in the raw material supply system 40 is automatically sucked by the negative pressure, and the volume of the other of the first booster chamber 111 and the second booster chamber 113 decreases, and the raw material liquid (polymer) in the booster chamber is pressurized and discharged. It should be noted that the single stroke time of the booster piston 112 is greater than 9 seconds, that is, the process of the hydraulic booster cylinder 34 entering or exiting the liquid once is more than 9 seconds. Among them, a first annular groove can be set at the center of the outer edge of the booster piston 112, and a first piston ring 118 is installed in the first annular groove to prevent liquid or gas from flowing into each chamber in the raw material booster cylinder 11.

[0074] Exemplarily, the diameter of the raw material boosting cylinder 11 may be 350 mm, 500 mm or 800 mm, etc., which is not limited here. The size of the hydraulic boosting cylinder 34 is the same as that of the raw material boosting cylinder 11. It can be understood that the speed of the hydraulic piston 342 can be controlled by controlling the pressure difference of the hydraulic oil in the left chamber 341 and the right chamber 343 of the hydraulic boosting cylinder 34, thereby controlling the speed of the boosting piston 112.

[0075] Exemplarily, the hydraulic piston 342 may be a round pancake-shaped structure, and its shape and size are matched with the hydraulic booster cylinder 34. It is worth mentioning that one of the left chamber 341 and the right chamber 343 of the hydraulic booster cylinder 34 enters the hydraulic oil, and the other discharges the hydraulic oil. The hydraulic force of the hydraulic oil can drive the hydraulic piston 342 to slide relative to the hydraulic booster cylinder 34. The hydraulic piston 342 drives the transmission connecting rod system 20 to move during the sliding process, and the transmission connecting rod system 20 drives the booster piston 112 to slide relative to the raw material booster cylinder 11. Optionally, the number of hydraulic booster cylinders 34 is greater than the number of raw material booster cylinders 11, ensuring that the raw material liquid output by the raw material booster cylinder 11 has sufficient pressure. Among them, a second annular groove can be set at the center of the outer edge of the hydraulic piston 342, and a second piston ring 344 is installed in the second annular groove to prevent liquid or gas from flowing into each chamber in the hydraulic booster cylinder 34.

[0076] Exemplarily, the multiple rod units 22 connected to the hydraulic piston 342 are evenly arranged, and the multiple rod units 22 connected to the booster piston 112 are evenly arranged. It is worth mentioning that the booster piston 112 and the hydraulic piston 342 are respectively connected to multiple rod units 22, so that the booster piston 112 and the hydraulic piston 342 have multiple force points when moving, and then the booster piston 112 and the hydraulic piston 342 are more evenly stressed when moving, ensuring that the rod unit 22, the piston and the hydraulic end of the booster cylinder are evenly stressed. Compared with the booster piston 112 and the hydraulic piston 342 being connected to only one rod unit 22, the diameter of a single rod unit 22 can be reduced, and then the space occupied by the transmission connecting rod system 20 inside the raw material booster cylinder 11 and the hydraulic booster cylinder 34 can be reduced, and the utilization rate of the cavity inside the booster cylinder is increased.

[0077] When the hydraulic boosting cylinders 34 and the raw material boosting cylinders 11 are arranged in a row, each raw material boosting cylinder 11 is provided with a hydraulic boosting cylinder 34 on both sides in the axial direction.

[0078] The oilfield polymer injection device 100 provided in this embodiment uses a raw material boosting cylinder 11 to boost the polymer. The first boosting chamber 111 and the second boosting chamber 113 of the raw material boosting cylinder 11 work simultaneously. When the first boosting chamber 111 enters the raw material liquid (polymer), the second boosting chamber 113 boosts the raw material liquid for external transmission. The raw material liquid (polymer) in the second boosting chamber 113 is squeezed by the boosting piston 112 to obtain boosting and flows out from the second raw material outlet 117. The hydraulic piston 342 can be driven to reciprocate left and right at a uniform speed by the liquid phase force of the hydraulic oil, thereby making the boosting piston 112 reciprocate left and right at a uniform speed, and controlling the single stroke time of the boosting piston 112 to be greater than 9 seconds. Since the raw material liquid (polymer) is squeezed by the boosting piston 112 only once in the second boosting chamber 113 and then flows out from the second raw material outlet 117, the influence of the mechanical strong shear of the high-speed rotation of the existing pump on the destruction of the polymer structure is effectively avoided, and the spatial network structure of the raw material liquid (polymer) will not be destroyed, thereby ensuring the viscosity of the raw material liquid (polymer) and the oil displacement effect. After the boosting piston 112 moves to the rightmost end of the second boosting chamber 113, the boosting piston 112 moves in the opposite direction to boost the first boosting chamber 111, and the raw material liquid (polymer) enters the second boosting chamber 113. When the boosting piston 112 moves to the leftmost end of the first boosting chamber 111, the raw material liquid boosting circulation structure is formed. In this way, the raw material liquid (polymer) is boosted alternately by the first boosting chamber 111 and the second boosting chamber 113, which can ensure that the raw material liquid flows continuously and reliably after being boosted. The oilfield polymer injection device 100 provided in this embodiment has the characteristics of self-priming, large flow, high pump pressure, low frequency, weak shear, multiple forms and compact structure. In addition, the structure of the hydraulic booster cylinder 34 is the same as that of the raw material booster cylinder 11, and the hydraulic booster cylinder 34 is the same size as the raw material booster cylinder 11. The corresponding booster cylinder can be set to the hydraulic booster cylinder 34 or the raw material booster cylinder 11 as needed. By adjusting the booster cylinder, the oilfield polymer injection device can adapt to high pressure, high flow rate, low pressure, and low flow rate conditions, and is suitable for different pressurization requirements for polymers. When the arrangement of the booster cylinder is fixed, the working plan is more diversified, which is conducive to improving the versatility of the oilfield polymer injection device 100.

[0079] The size of the raw material boosting cylinder 11 can ensure the single stroke time of the boosting piston 112. Under the premise of ensuring that the raw material boosting cylinder 11 outputs a high raw material liquid pressure, the cavity of a single boosting cylinder is large and long, the stroke is increased, the number of strokes is reduced, the self-priming performance of the pump is improved, the raw material boosting cylinder 11 has a long time for liquid in and out at one time, and the influence of the frequent turning of the boosting piston 112 on polymer shear is weakened. The hydraulic piston 342 and the boosting piston 112 are respectively connected to multiple rod units 22, so that the hydraulic piston 342 and the boosting piston 112 are evenly stressed, and the hydraulic piston 342 and the boosting piston 112 are not easily deformed. The raw material boosting cylinder 11 and the hydraulic boosting cylinder 34 can be arranged in one row or in multiple rows, and the layout of the oilfield polymer injection device 100 is more flexible. When the hydraulic booster cylinder 34 and the raw material booster cylinder 11 are arranged in a row, a hydraulic booster cylinder 34 is provided on both sides of each raw material booster cylinder 11, so that the transmission connecting rod system 20 is subjected to force on both sides of the raw material booster cylinder 11, which is beneficial to improving the service life of the transmission connecting rod system 20.

[0080] In one embodiment, Figure 1-Figure 5 As shown, the hydraulic booster cylinder 34 and the raw material booster cylinder 11 are arranged in a row, and each raw material booster cylinder 11 is coaxial with each hydraulic booster cylinder 34. The axis of the rod unit 22 is parallel to the axis of the raw material booster cylinder 11, and each rod unit 22 is connected to each booster piston 112 and each hydraulic piston 342 respectively.

[0081] When the hydraulic boosting cylinder 34 and the raw material boosting cylinder 11 are arranged in a row, the rod unit 22 may include only one rod body. The number and distribution of the rod units 22 may be determined according to the cavity diameter of the boosting chamber, the external output pressure, etc., and are not limited to them. For example, two adjacent boosting cylinders may be close to each other to reduce the space occupied by multiple raw material boosting cylinders 11 and multiple hydraulic boosting cylinders 34. Figure 1-Figure 5 It is shown that the rod unit 22 penetrates through the adjacent side walls of two booster cylinders and is sealedly connected to the corresponding booster cylinders.

[0082] Exemplarily, each boosting piston 112 and each hydraulic piston 342 may be fixed to the rod unit 22 by welding, key connection, or threaded connection, etc., which is not limited here.

[0083] In this embodiment, each rod unit 22 is respectively connected to each boosting piston 112 and each hydraulic piston 342, which is conducive to simplifying the structure of the transmission connecting rod system 20 and facilitating the layout of the oilfield polymer injection device 100. When multiple boosting cylinders are coaxially arranged, the staff can connect the boosting cylinders to the raw material supply system 40 or the hydraulic pipeline as needed, so that the staff can set the boosting cylinders as raw material boosting cylinders 11 or hydraulic boosting cylinders 34 as needed.

[0084] In a specific embodiment, Figure 1-Figure 5As shown, the oilfield polymer injection device 100 also includes a plurality of reversing valve groups 35, and each raw material boosting cylinder 11 and each hydraulic boosting cylinder 34 are respectively provided with a corresponding reversing valve group 35. The hydraulic system 30 also includes a hydraulic oil supply pipeline 31 and a hydraulic oil recovery pipeline 32, and the left chamber 341 and the right chamber 343 are respectively connected to the corresponding reversing valve group 35 and communicated with the hydraulic oil supply pipeline 31 and the hydraulic oil recovery pipeline 32 through the reversing valve group 35. The first boosting chamber 111 and the second boosting chamber 113 are respectively connected to the corresponding reversing valve group 35 and communicated with the raw material supply system 40 through the reversing valve group 35 and provide polymer to the outside.

[0085] The number of the boost cylinders is the same as the number of the reversing valve groups 35, and each boost cylinder is connected to a corresponding reversing valve group 35. Schematically, the reversing valve group 35 can be a two-position four-way reversing valve group.

[0086] like Figure 1 and Figure 2 As shown, the raw material boosting cylinder 11 is provided with a first liquid inlet and outlet 1191 and a second liquid inlet and outlet 1192, which can be respectively provided at the top of the raw material boosting cylinder 11, the first liquid inlet and outlet 1191 is connected to the first boosting chamber 111, and the second liquid inlet and outlet 1192 is connected to the second boosting chamber 113. By controlling the state of the reversing valve group 35 on the raw material boosting cylinder 11, the first boosting chamber 111 can be connected to the raw material supply system 40, and the raw material liquid in the second boosting chamber 113 can be discharged; by controlling the state of the reversing valve group 35 on the raw material boosting cylinder 11, the second boosting chamber 113 can be connected to the raw material supply system 40, and the raw material liquid in the first boosting chamber 111 can be discharged. Among them, the state of the reversing valve group 35 can be adjusted by supplying power to the reversing valve group 35 or stopping the power supply to the reversing valve group 35.

[0087] Figure 1 and Figure 2It is shown that the hydraulic booster cylinder 34 is provided with a third liquid inlet and outlet 345 and a fourth liquid inlet and outlet 346, which can be respectively provided at the top of the hydraulic booster cylinder 34, the third liquid inlet and outlet 345 is in communication with the left chamber 341, and the fourth liquid inlet and outlet 346 is in communication with the right chamber 343. By controlling the state of the reversing valve group 35 on the hydraulic booster cylinder 34, the left chamber 341 can be in communication with the hydraulic oil supply pipeline 31, and the right chamber 343 can be in communication with the hydraulic oil recovery pipeline 32; by controlling the state of the reversing valve group 35 on the hydraulic booster cylinder 34, the right chamber 343 can also be in communication with the hydraulic oil supply pipeline 31, and the left chamber 341 can be in communication with the hydraulic oil recovery pipeline 32. The hydraulic oil is alternately directed to the left chamber 341 and the right chamber 343 of the hydraulic booster cylinder 34 through the reversing valve group 35 connected to the hydraulic booster cylinder 34, and the hydraulic oil in the right chamber 343 and the left chamber 341 are alternately discharged. This process realizes the reciprocating thrust of the hydraulic piston 342 by the liquid phase force of the hydraulic oil.

[0088] In this structure, the hydraulic oil can be alternately directed to the left chamber 341 and the right chamber 343 of the hydraulic booster cylinder 34 through the reversing valve group 35 on the hydraulic booster cylinder 34, and the hydraulic oil in the right chamber 343 and the left chamber 341 can be alternately discharged at the same time. This process realizes the hydraulic oil liquid phase force to reciprocate the hydraulic piston 342. The first booster chamber 111 and the second booster chamber 113 of the booster cylinder body of the device of the present invention work simultaneously. The first booster chamber 111 and the second booster chamber 113 are driven to reciprocate left and right by the booster piston 112. Through the action of the reversing valve group 35, when one booster chamber relies on negative pressure to enter the liquid, the other booster chamber pressurizes the raw material liquid for external transmission, realizing the synchronous operation of pressurization external transmission and negative pressure entry, the output flow unevenness is close to 0, the useless stroke is eliminated, the structure is compact, the booster piston 112 works more efficiently, the output pressure is stable, the pulsation is reduced, and the flow is continuous.

[0089] like Figure 1-Figure 3 As shown, the oilfield polymer injection device 100 also includes two steering switches, and each reversing valve group 35 is electrically connected to the two steering switches. When the transmission connecting rod system 20 moves to the first position, one of the steering switches transmits a signal to each reversing valve group 35, and when the transmission connecting rod system 20 moves to the second position, the other steering switch transmits a signal to each reversing valve group 35.

[0090] Schematically, the two steering switches are respectively a first steering switch 51 and a second steering switch 52. The steering switch can be installed on the side wall of the raw material boosting cylinder 11 or the hydraulic boosting cylinder 34, and the two steering switches can be installed on two boosting cylinders respectively or on the same boosting cylinder, which is not limited here.

[0091] For example, Figure 1-Figure 3As shown, when a hydraulic booster cylinder 34 is provided on the left and right sides of the raw material booster cylinder 11, respectively, the first steering switch 51 can be installed on the left side wall of the left hydraulic booster cylinder 34, and the second steering switch 52 can be installed on the right side wall of the right hydraulic booster cylinder 34. When the booster piston 112 in the raw material booster cylinder 11 is transmitted to the right, the electromagnetic of each reversing valve group 35 is not in effect, and the high-pressure hydraulic oil can enter the left chamber 341 of each hydraulic booster cylinder 34 through the hydraulic oil delivery pipeline 31. The hydraulic pressure drives the hydraulic piston 342 to move to the right, and the low-pressure hydraulic oil in the right chamber 343 of the hydraulic booster cylinder 34 is discharged from the hydraulic booster cylinder 34 through the hydraulic oil recovery pipeline 32. The driving force is transmitted to the booster piston 112 through the transmission connecting rod system 20. The booster piston 11 2 moves to the right, pressurizing the raw material liquid in the second pressurizing chamber 113 of the raw material pressurizing cylinder 11 and transmitting it outward, while the first pressurizing chamber 111 forms a negative pressure, automatically sucking in the raw material liquid; when the hydraulic piston 342 in the right hydraulic pressurizing cylinder 34 moves to the second steering switch 52, the hydraulic piston 342 squeezes the second steering switch 52, and the second steering switch 52 acts to transmit a signal to each reversing valve group 35, so that each reversing valve group 35 electromagnetically starts to work, completing the inlet and outlet liquid reversal of the three pressurizing cylinders. When the raw material pressurizing system 10 is transmitted to the left, the hydraulic piston 342 in the left hydraulic pressurizing cylinder 34 moves to the first steering switch 51 and squeezes the first steering switch 51, and the first steering switch 51 acts to transmit a signal to each reversing valve group 35, so that each reversing valve group 35 electromagnetically stops working, and a reciprocating pressurizing stroke process ends.

[0092] In this embodiment, two steering switches are provided, and the states of the two steering switches can control the states of the reversing valve groups 35 to achieve automatic suction of the raw material liquid and automatic pressurized external transmission.

[0093] In one possible implementation, Figure 1-Figure 3 As shown, the number of the raw material boosting cylinder 11 is one, and a hydraulic boosting cylinder 34 is respectively arranged on both sides of the raw material boosting cylinder 11 .

[0094] Figure 1-Figure 3 As shown, the oilfield polymer injection device 100 uses two hydraulic booster cylinders 34 and one raw material booster cylinder 11, which is a two-cylinder one-action form. At this time, the oilfield polymer injection device 100 is suitable for working conditions where the output flow rate and pressure requirements are not high. The flow rate range of the raw material liquid output by the raw material booster cylinder 11 can be 2.5m 3 / h-25m 3 / h.

[0095] In another possible implementation, Figure 4 As shown, the number of the raw material boosting cylinder 11 is one, and a plurality of hydraulic boosting cylinders 34 are respectively arranged on both sides of the raw material boosting cylinder 11, and the number of the hydraulic boosting cylinders 34 on both sides of the raw material boosting cylinder 11 is the same.

[0096] The number of hydraulic booster cylinders 34 on both sides of the raw material booster cylinder 11 is not limited, and those skilled in the art can set it according to the external output pressure required by the raw material booster cylinder 11, for example Figure 4 As shown in FIG. 1 , two hydraulic boosting cylinders 34 may be provided on both sides of the raw material boosting cylinder 11 . Figure 4 It is shown that the oilfield polymer injection device 100 adopts four hydraulic booster cylinders 34 and one raw material booster cylinder 11, which is a four-cylinder single-acting type, suitable for working conditions with higher pressure. One raw material booster cylinder 11 is driven by multiple hydraulic booster cylinders 34, so that the raw material booster cylinder 11 can provide a higher external output pressure.

[0097] It is worth mentioning that the number of hydraulic booster cylinders 34 on both sides of the raw material booster cylinder 11 is the same, which can ensure that the force on both sides of the rod unit 22 is uniform, which is beneficial to improving the service life of the transmission connecting rod system 20.

[0098] In another possible implementation, Figure 5 As shown, there are multiple raw material boosting cylinders 11, and the number of hydraulic boosting cylinders 34 is one more than the number of raw material boosting cylinders 11. The raw material boosting cylinders 11 and the hydraulic boosting cylinders 34 are arranged alternately, and hydraulic boosting cylinders 34 are provided on both sides of each raw material boosting cylinder 11.

[0099] like Figure 5 As shown, the oilfield polymer injection device 100 can use three hydraulic booster cylinders 34 and two raw material booster cylinders 11, which is a three-cylinder two-action form. The oilfield polymer injection device 100 is suitable for working conditions with a large flow rate. In this embodiment, there is no restriction on the number of hydraulic booster cylinders 34 and raw material booster cylinders 11, that is, the oilfield polymer injection device 100 can use n hydraulic booster cylinders 34 and n-1 raw material booster cylinders 11, which is an n-cylinder n-1 action form. The multiple booster cylinders are hydraulic booster cylinder 34, raw material booster cylinder 11, hydraulic booster cylinder 34, raw material booster cylinder 11, hydraulic booster cylinder 34 from left to right, and the hydraulic booster cylinder 34 and the raw material booster cylinder 11 are arranged in a combination form with intervals.

[0100] In this structure, the number of raw material boosting cylinders 11 is large, which can provide a higher external flow rate. The external flow rate range of the raw material liquid of the three-cylinder two-action oil field injection device 100 can be 5m 3 / h-50m 3 The staggered arrangement of the raw material boosting cylinder 11 and the hydraulic boosting cylinder 34 can make the rod unit 22 evenly stressed in its length direction, reduce the stress concentration of the rod unit 22, and increase the service life of the transmission connecting rod system 20.

[0101] In other embodiments, the oilfield polymer injection device 100 can be in the form of n-cylinder-nk action, that is, the oilfield polymer injection device 100 can use n raw material boosting cylinders 11 and nk hydraulic boosting cylinders 34, and the number of hydraulic boosting cylinders 34 does not exceed the number of raw material boosting cylinders 11. By setting the number of raw material boosting cylinders 11 and hydraulic boosting cylinders 34 respectively, the oilfield polymer injection device 100 can be suitable for a variety of flow rates and pressure ranges, and can meet the polymer boosting requirements of high pressure, high flow rate, low pressure, and low flow rate.

[0102] like Figure 9-12 As shown, in one embodiment, the raw material boosting cylinder 11 is provided with a first raw material inlet 114 and a first raw material outlet 115 connected to the first boosting chamber 111, and a second raw material inlet 116 and a second raw material outlet 117 connected to the second boosting chamber 113. The raw material supply system 40 is connected to the first raw material inlet 114 and the second raw material inlet 116, respectively, to provide polymer to the first boosting chamber 111 and the second boosting chamber 113.

[0103] The oilfield polymer injection device 100 provided in this embodiment uses a raw material boosting cylinder 11 to boost the polymer. The first boosting chamber 111 and the second boosting chamber 113 of the raw material boosting cylinder 11 work simultaneously. When the raw material liquid (polymer) enters the first boosting chamber 111, the second boosting chamber 113 boosts the raw material liquid for external transmission. The raw material liquid (polymer) in the second boosting chamber 113 is squeezed by the boosting piston 112 to obtain boosted pressure and flows out from the second raw material outlet 117. Since the raw material liquid (polymer) is squeezed by the boosting piston 112 only once in the second boosting chamber 113 and then flows out from the second raw material outlet 117, the mechanical strong shearing of the existing pump at high speed on the polymer structure is effectively avoided. The spatial network structure of the raw material liquid (polymer) will not be damaged, thereby ensuring the viscosity of the raw material liquid (polymer) and the oil displacement effect; after the boosting piston 112 moves to the rightmost end of the second boosting chamber, the boosting piston 112 moves in the opposite direction to pressurize the first boosting chamber 111, and the raw material liquid (polymer) enters the second boosting chamber. When the boosting piston 112 moves to the leftmost end of the first boosting chamber 111, the raw material liquid is pressurized in a circulation structure once. In this way, the raw material liquid (polymer) is pressurized alternately by the first boosting chamber 111 and the second boosting chamber 113, which can ensure that the raw material liquid flows continuously and reliably after being pressurized, and is adaptable to high pressure, high flow rate, low pressure, and low flow rate conditions.

[0104] In an optional embodiment of the present application, the first raw material inlet 114 and the first raw material outlet 115 are respectively opened along the radial direction of the raw material boosting cylinder 11 and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder 11, and the second raw material inlet 116 and the second raw material outlet 117 are respectively opened along the radial direction of the raw material boosting cylinder 11 and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder 11.

[0105] In an optional embodiment of the present application, the raw material booster cylinder 11 is cylindrical and has a large volume, and a liquid inlet or outlet process takes more than 20 seconds, further avoiding the influence of mechanical strong shearing caused by high-speed rotation of the pump on the destruction of the polymer structure.

[0106] In an optional embodiment of the present application, the raw material pressurizing system 10 includes a plurality of raw material pressurizing cylinders 11 connected in parallel, which further increases the flow rate of the pressurized polymer.

[0107] In an optional embodiment of the present application, the hydraulic system 30 at least includes a hydraulic oil supply pipeline 31, a hydraulic oil recovery pipeline 32, two hydraulic booster cylinders 34 and two reversing valve groups 35, and the rod unit 22 includes a connecting rod 222. The connecting rod 222 and the two hydraulic booster cylinders 34 are coaxially arranged, and the connecting rod 222 is located between the two hydraulic booster cylinders 34. Both ends of the connecting rod 222 are respectively sealed to penetrate the hydraulic booster cylinders 34 and are fixedly connected to the hydraulic piston 342. The hydraulic booster cylinders 34 and the reversing valve groups 35 are arranged one by one, and the left chamber 341 and the right chamber 343 are respectively connected to the corresponding reversing valve groups 35 and communicate with the hydraulic oil supply pipeline 31 and the hydraulic oil recovery pipeline 32 through the reversing valve groups 35.

[0108] In another possible implementation, there are multiple connecting rods 222 , the axial direction of each connecting rod 222 is parallel to the axial direction of the hydraulic booster cylinder 34 , and both ends of each connecting rod 222 are fixedly connected to the two hydraulic pistons 342 .

[0109] In an optional example of this embodiment, the reversing valve group 35 diverts the hydraulic oil in the hydraulic oil supply pipeline 31 alternately to the left chamber 341 and the right chamber 343, and the reversing valve group 35 also diverts the hydraulic oil in the right chamber 343 and the hydraulic oil in the left chamber 341 alternately to the hydraulic oil recovery pipeline 32.

[0110] Specifically, the high-pressure hydraulic oil from the hydraulic oil supply pipeline 31 passes through the two hydraulic reversing valve groups 35 and enters the right chambers 343 of the two hydraulic booster cylinders 34 respectively. The pressure increase in the right chamber 343 pushes the hydraulic piston 342 to move leftward and compresses the left chamber 341. The hydraulic oils of the two left chambers 341 respectively enter the hydraulic oil recovery pipeline 32 through the two reversing valve groups 35. When the hydraulic piston 342 moves to the leftmost side of the left chamber 341, the reversing valve group 35 is reversed to The high-pressure hydraulic oil sent from the hydraulic oil into the pipeline 31 passes through two hydraulic reversing valve groups 35 and enters the left chambers 341 of the two hydraulic booster cylinders 34 respectively. The increased pressure in the left chamber 341 pushes the hydraulic piston 342 to move rightward and thus compresses the right chamber 343. The hydraulic oil in the two right chambers 343 enters the hydraulic oil recovery pipeline 32 respectively through the two reversing valve groups 35. In the above process, the two hydraulic pistons 342 move left and right synchronously, thereby driving the connecting rod 222 to move left and right.

[0111] In an optional example of this embodiment, the axis of the hydraulic booster cylinder 34 is parallel to the axis of the raw material booster cylinder 11, the transmission connecting rod system 20 also includes a transmission rod 21, and the rod unit 22 also includes a driving rod 221. The transmission rod 21 is arranged perpendicular to the connecting rod 222 and is fixedly connected to the connecting rod 222. The driving rod 221 is arranged parallel to the connecting rod 222. One end of the driving rod 221 is connected to the transmission rod 21, and the other end of the driving rod 221 is sealed and passes through the raw material booster cylinder 11 and is fixedly connected to the booster piston 112.

[0112] Optionally, the number of the driving rods 221 may be multiple, and the same booster piston 112 may be fixedly connected to multiple driving rods 221. When the number of the connecting rods 222 and the driving rods 221 are multiple, the multiple connecting rods 222 may be connected to the first connecting member, the multiple driving rods 221 may be connected to the second connecting member, and the transmission rod 21 is connected to the first connecting member and the second connecting member respectively.

[0113] With the above structure, the transmission rod 21 moves left and right synchronously with the connecting rod 222, and the driving rod 221 connected to the transmission rod 21 also moves left and right, thereby driving the boosting piston 112 to move left and right, thereby boosting the raw material liquid (polymer).

[0114] In an optional example, the raw material boosting system 10 includes at least two raw material boosting cylinders 11, the two raw material boosting cylinders 11 form a raw material boosting cylinder group, the two raw material boosting cylinders 11 are symmetrically arranged on both sides of the transmission rod 21, the axes of the two raw material boosting cylinders 11 are perpendicular to the transmission rod 21, and the boosting pistons 112 in each raw material boosting cylinder 11 are connected to the transmission rod 21 through the driving rod 221. The two raw material boosting cylinders 11 are symmetrically arranged on both sides of the transmission rod 21, so that the transmission rod 21 can be balanced in force, ensuring that the transmission connecting rod system 20 and the hydraulic system 30 can operate smoothly.

[0115] In an optional example, the raw material pressurizing system 10 includes two raw material pressurizing cylinder groups, and the two raw material pressurizing cylinder groups are arranged at intervals along the length direction of the transmission rod 21.

[0116] In an optional example of this embodiment, Figure 1 , Figure 6 and Fig.10 As shown, the hydraulic system 30 further includes a hydraulic oil compressor 36, a hydraulic oil buffer tank 37, a hydraulic oil filter 38 and a hydraulic oil air cooling device 39 which are sequentially connected in series. The hydraulic oil compressor 36 is connected to the hydraulic oil supply pipeline 31, and the hydraulic oil air cooling device 39 is connected to the hydraulic oil recovery pipeline 32. The hydraulic oil air cooling device 39 is used to cool down the hydraulic oil flowing out of the hydraulic booster cylinder 34. The cooled low-pressure hydraulic oil enters the hydraulic oil filter 38, and the filtered low-pressure hydraulic oil enters the hydraulic oil buffer tank 37. Then, the low-pressure hydraulic oil enters the hydraulic oil compressor 36 to be pressurized into high-pressure hydraulic oil, and finally, the high-pressure hydraulic oil enters the hydraulic booster cylinder 34.

[0117] In an optional embodiment of the present application, a feed check valve 12 that only allows polymer to enter is installed at the first raw material inlet 114 and the second raw material inlet 116, respectively, and a discharge check valve 13 that only allows polymer to flow out is installed at the first raw material outlet 115 and the second raw material outlet 117, respectively.

[0118] In an optional embodiment of the present application, the raw material supply system 40 includes at least a polymer storage tank 41 and a polymer delivery pipeline 42 , and the polymer storage tank 41 is connected to the first raw material inlet 114 and the second raw material inlet 116 through the polymer delivery pipeline 42 .

[0119] In an optional embodiment of the present application, each pipeline in the raw material boosting system 10, each pipeline in the hydraulic system 30, and each pipeline in the raw material supply system 40 are connected by flanges, which is convenient for installation and maintenance and provides the possibility for serial connection of multiple sets of oil field injection devices 100.

[0120] In other embodiments, when the raw material boosting cylinder 11 is only provided with the first liquid inlet and outlet 1191 and the second liquid inlet and outlet 1192, the polymer storage tank 41 can be connected to the first liquid inlet and outlet 1191 and the second liquid inlet and outlet 1192 through the polymer delivery pipeline 42 via the corresponding reversing valve group 35.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An oilfield polymer injection device, characterized in that: include: A raw material boosting system, comprising at least one raw material boosting cylinder, wherein the raw material boosting cylinder has a first boosting chamber, a boosting piston and a second boosting chamber sequentially arranged along the axial direction, the boosting piston is in sealing and sliding cooperation with the inner wall of the raw material boosting cylinder, the single stroke time of the boosting piston is greater than 9 seconds, the raw material boosting cylinder is cylindrical, the diameter of the raw material boosting cylinder is greater than 300 mm, the length of the raw material boosting cylinder is greater than 3 times the diameter of the raw material boosting cylinder, and the speed of the boosting piston is 0.01 m / s-0.1 m / s; A transmission connecting rod system, comprising a plurality of rod units, the boosting piston being connected to the plurality of rod units, and the transmission connecting rod system being configured to drive the boosting piston to reciprocate along the axial direction of the raw material boosting cylinder; A hydraulic system, comprising a plurality of hydraulic booster cylinders, wherein the hydraulic booster cylinders have a left chamber, a hydraulic piston and a right chamber sequentially arranged along the axial direction, the hydraulic piston is in sealing and sliding cooperation with the inner wall of the hydraulic booster cylinder, the hydraulic system is connected to the transmission connecting rod system and provides power for the transmission connecting rod system, and the hydraulic piston is connected to a plurality of the rod units; a raw material supply system configured to supply polymer to the first pressurizing chamber and the second pressurizing chamber; The structure of the hydraulic booster cylinder is the same as that of the raw material booster cylinder, and the size of the hydraulic booster cylinder is the same as that of the raw material booster cylinder; The hydraulic boosting cylinders and the raw material boosting cylinders are arranged in at least one row. When the hydraulic boosting cylinders and the raw material boosting cylinders are arranged in one row, the hydraulic boosting cylinders are respectively arranged on both sides of each raw material boosting cylinder.

2. The oilfield polymer injection device according to claim 1, characterized in that: The hydraulic boosting cylinders and the raw material boosting cylinders are arranged in a row, and each of the raw material boosting cylinders is coaxial with each of the hydraulic boosting cylinders; The axis of the rod unit is parallel to the axis of the raw material boosting cylinder, and each of the rod units is respectively connected to each of the boosting pistons and each of the hydraulic pistons.

3. The oil field polymer injection device according to claim 2, characterized in that: The oilfield polymer injection device also includes a plurality of reversing valve groups, each of the raw material boosting cylinders and each of the hydraulic boosting cylinders is respectively arranged corresponding to one of the reversing valve groups. The hydraulic system further includes a hydraulic oil supply pipeline and a hydraulic oil recovery pipeline, the left chamber and the right chamber are respectively connected to the corresponding reversing valve group and are in communication with the hydraulic oil supply pipeline and the hydraulic oil recovery pipeline through the reversing valve group; The first boost chamber and the second boost chamber are respectively connected to the corresponding reversing valve group and communicate with the raw material supply system through the reversing valve group to provide polymer to the outside.

4. The oilfield polymer injection device according to claim 3, characterized in that: The oilfield polymer injection device also includes two steering switches, and each of the reversing valve groups is electrically connected to the two steering switches respectively; When the transmission link system moves to the first position, one of the steering switches transmits a signal to each of the reversing valve groups. When the transmission link system moves to the second position, another steering switch transmits a signal to each of the reversing valve groups.

5. The oilfield polymer injection device according to claim 2, characterized in that: The number of the raw material boosting cylinder is one, and one hydraulic boosting cylinder is respectively arranged on both sides of the raw material boosting cylinder; Alternatively, the number of the raw material boosting cylinder is one, and a plurality of the hydraulic boosting cylinders are respectively arranged on both sides of the raw material boosting cylinder, and the number of the hydraulic boosting cylinders on both sides of the raw material boosting cylinder is the same; Alternatively, there are multiple raw material boosting cylinders, the number of the hydraulic boosting cylinders is one more than the number of the raw material boosting cylinders, the raw material boosting cylinders and the hydraulic boosting cylinders are arranged alternately, and the hydraulic boosting cylinders are provided on both sides of each of the raw material boosting cylinders.

6. The oilfield polymer injection device according to claim 1, characterized in that: The raw material boosting cylinder is provided with a first raw material inlet and a first raw material outlet communicated with the first boosting chamber, and a second raw material inlet and a second raw material outlet connected with the second boosting chamber; The raw material supply system is respectively connected to the first raw material inlet and the second raw material inlet to provide polymer to the first pressurizing chamber and the second pressurizing chamber.

7. The oilfield polymer injection device according to claim 6, characterized in that: The first raw material inlet and the first raw material outlet are respectively opened along the radial direction of the raw material boosting cylinder and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder. The second raw material inlet and the second raw material outlet are respectively opened along the radial direction of the raw material boosting cylinder and are symmetrically arranged on both sides of the axis of the raw material boosting cylinder.

8. The oilfield polymer injection device according to claim 6, characterized in that: The hydraulic system at least includes a hydraulic oil supply pipeline, a hydraulic oil recovery pipeline, two hydraulic booster cylinders and two reversing valve groups. The rod unit includes a connecting rod. The connecting rod and the two hydraulic booster cylinders are coaxially arranged, and the connecting rod is located between the two hydraulic booster cylinders. Both ends of the connecting rod are respectively sealed and pass through the hydraulic booster cylinders and are fixedly connected to the hydraulic pistons. The hydraulic booster cylinders and the reversing valve groups are arranged in a one-to-one correspondence. The left chamber and the right chamber are respectively connected to the corresponding reversing valve groups and are communicated with the hydraulic oil supply pipeline and the hydraulic oil recovery pipeline through the reversing valve groups.

9. The oilfield polymer injection device according to claim 8, characterized in that: The reversing valve group guides the hydraulic oil sent into the pipeline alternately to the left chamber and the right chamber, and the reversing valve group also guides the hydraulic oil in the right chamber and the hydraulic oil in the left chamber alternately to the hydraulic oil recovery pipeline.

10. The oilfield polymer injection device according to claim 8, characterized in that: The axis of the hydraulic booster cylinder is parallel to the axis of the raw material booster cylinder, the transmission connecting rod system also includes a transmission rod, and the rod unit also includes a driving rod. The transmission rod is arranged perpendicular to the connecting rod and is fixedly connected to the connecting rod, and the driving rod is arranged parallel to the connecting rod. One end of the driving rod is connected to the transmission rod, and the other end of the driving rod is sealed and passes through the raw material booster cylinder and is fixedly connected to the booster piston.

11. The oilfield polymer injection device according to claim 10, characterized in that: The raw material boosting system includes at least two raw material boosting cylinders, the two raw material boosting cylinders form a raw material boosting cylinder group, the two raw material boosting cylinders are symmetrically arranged on both sides of the transmission rod, the axes of the two raw material boosting cylinders are perpendicular to the transmission rod, and the boosting pistons in each raw material boosting cylinder are connected to the transmission rod through the driving rod respectively.

12. The oilfield polymer injection device according to claim 11, characterized in that: The raw material pressurizing system comprises two raw material pressurizing cylinder groups, and the two raw material pressurizing cylinder groups are arranged at intervals along the length direction of the transmission rod.

13. The oil field polymer injection device according to claim 3 or 8, characterized in that: The hydraulic system also includes a hydraulic oil compressor, a hydraulic oil buffer tank, a hydraulic oil filter and a hydraulic oil air cooling device which are sequentially connected in series. The hydraulic oil compressor is connected to the hydraulic oil supply pipeline, and the hydraulic oil air cooling device is connected to the hydraulic oil recovery pipeline.

14. The oil field polymer injection device according to claim 6, characterized in that: The first raw material inlet and the second raw material inlet are respectively installed with a feed check valve that only allows the polymer to enter, and the first raw material outlet and the second raw material outlet are respectively installed with a discharge check valve that only allows the polymer to flow out.

15. The oil field polymer injection device according to claim 6, characterized in that: The raw material supply system at least includes a polymer storage tank and a polymer delivery pipeline. The polymer storage tank is connected to the first raw material inlet and the second raw material inlet through the polymer delivery pipe.

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