High-pressure polymer injection pry for oil exploitation

Abstract

The utility model relates to a high-pressure polymer injection pry for oil exploitation, and belongs to the technical field of oil well exploitation. Comprising a polymer input pipeline which is sequentially connected with a first flow meter, a low-shear flow regulating valve and a first check valve in the flowing direction of a polymer; a second flow meter, a water flow adjusting valve and a second check valve are sequentially connected to the water injection input pipeline in the water flow direction; an inlet of the mixture output pipeline is respectively communicated with an outlet of the polymer input pipeline and an outlet of the water injection input pipeline, and the mixture output pipeline is connected with a static mixer and a third check valve. According to the low-shear flow regulating valve, the shear force on the polymer mother liquor can be remarkably reduced, and it can be guaranteed that the polymer mother liquor has the high viscosity retention rate. The prefabricated pry is compact in structure, on-site intelligent control is facilitated, and manpower and site requirements are reduced.

Description

Technical Field

[0001] This application relates to the field of oil well development technology, and in particular to a high-pressure polymer injection skid for oil well development. Background Technology

[0002] As oil fields are developed, formation pressure continuously decreases, making it difficult to achieve high and stable production. Currently, polymer flooding is one of the main measures used in the development of ultra-high water-cut oil fields to improve oil recovery and increase recoverable reserves. By injecting a polymer solution of a certain concentration into the formation from the wellhead, the viscosity of the injected fluid is increased, improving the flow ratio between oil and water, thereby expanding the swept volume and improving oil recovery.

[0003] Existing problem: The polymer solution is a pseudoplastic fluid among non-Newtonian fluids. If subjected to shear force during flow, the polymer molecular chains break, disrupting the polymer structure and consequently reducing viscosity. This leads to a decrease in the viscosity of the injected fluid, with viscosity losses from preparation to injection well reaching up to 70%. Conventional valves cause viscosity losses exceeding 40%.

[0004] Polymer solution preparation equipment has a long construction period, occupies a large area, and cannot be reused. Traditional polymer solution preparation equipment has a low degree of automation, insufficient injection volume precision, and high labor intensity for personnel. Summary of the Invention

[0005] This application provides a high-pressure polymer injection skid for oil extraction to solve the problems in related technologies where the viscosity of the injected liquid decreases when subjected to shear force during the flow of polymer solution preparation equipment, and where the construction cycle of polymer solution preparation equipment is long, the area occupied is large, and it cannot be reused.

[0006] This application provides a high-pressure polymer injection skid for oil extraction, comprising:

[0007] A polymer inlet pipeline, wherein a first flow meter, a low shear flow regulating valve and a first check valve are sequentially connected along the flow direction of the polymer.

[0008] The water injection pipeline is connected in sequence with a second flow meter, a water flow regulating valve, and a second check valve along the water flow direction.

[0009] The mixture output pipeline has its inlet connected to the outlets of the polymer input pipeline and the water injection input pipeline, respectively, and is equipped with a static mixer and a third check valve.

[0010] In some embodiments, the system further includes a skid body, which is a rectangular frame structure formed by connecting profiles, and the polymer inlet pipe, water inlet pipe, and mixture outlet pipe are all fixedly connected to the skid body.

[0011] In some embodiments: the polymer input pipeline, the water injection input pipeline, and the mixture output pipeline are each provided in two sets, and one set of the polymer input pipeline, the water injection input pipeline, and the mixture output pipeline are interconnected to form a first polymer injection module;

[0012] Another set of polymer input pipelines, water input pipelines and mixture output pipelines are interconnected to form a second polymer injection module. The first polymer injection module and the second polymer injection module are symmetrically spaced within the skid body.

[0013] In some embodiments: the mixture output pipeline is connected to a sampler, the sampler including a sampling branch pipeline connected to the mixture output pipeline, a first valve connected to the sampling branch pipeline, a sampling chamber connected to the outlet of the sampling branch pipeline, and a second valve for discharging the sample connected to the sampling chamber.

[0014] In some embodiments: a piston is slidably and sealed within the sampling chamber, a guide rod is provided within the sampling chamber to connect to the piston, and a drive spring is sleeved on the guide rod to drive the piston to slide toward the sampling branch pipeline.

[0015] In some embodiments: the inlet of the mixture output pipeline is connected to the outlet of the polymer input pipeline and the water injection input pipeline respectively through a tee connector, the mixture output pipeline is provided with a dosing pipeline upstream of the static mixer, and a third valve is connected to the dosing pipeline.

[0016] In some embodiments: the polymer inlet line is located upstream of the first flow meter and is connected to a first pressure sensor and a fourth valve;

[0017] The water injection inlet pipeline is located upstream of the second flow meter and is connected to a second pressure sensor and a first pressure transmitter;

[0018] The mixture output pipeline is located downstream of the third check valve and is connected to a third pressure sensor, a second pressure transmitter, and a fifth valve.

[0019] In some embodiments: the low shear flow regulating valve is connected to a first electric actuator, and the water flow regulating valve is connected to a second electric actuator.

[0020] In some embodiments: the low shear flow regulating valve includes a cylindrical valve housing, and multiple valve sleeves are provided inside the valve housing and connected sequentially along the length of the valve housing, and a valve stem is slidably connected inside the valve sleeves;

[0021] Each of the valve sleeves is provided with a flange that is slidably and sealingly connected to the valve stem, and a valve cavity with an inner diameter larger than the outer diameter of the valve stem is formed between two adjacent flanges;

[0022] The valve stem is provided with a plurality of guide grooves on its outer periphery for connecting two adjacent valve chambers, and the plurality of guide grooves are arranged sequentially at intervals along the length direction of the valve stem.

[0023] In some embodiments, the angle between two adjacent guide grooves along the length of the valve stem is 90-270°, and two guide grooves are symmetrically provided at the same axial position of the valve stem.

[0024] The beneficial effects of the technical solution provided in this application include:

[0025] This application provides a high-pressure polymer injection skid for oil extraction. The high-pressure polymer injection skid is equipped with a polymer input pipeline, on which a first flow meter, a low-shear flow regulating valve, and a first check valve are sequentially connected along the polymer flow direction; a water injection pipeline, on which a second flow meter, a water flow regulating valve, and a second check valve are sequentially connected along the water flow direction; and a mixture output pipeline, whose inlet is connected to the outlets of both the polymer input pipeline and the water injection pipeline, and which is connected to a static mixer and a third check valve.

[0026] Therefore, the oil well using the high-pressure polymer injection skid of this application utilizes a polymer input pipeline to sequentially pass the polymer mother liquor through a first flow meter, a low-shear flow regulating valve, and a first check valve before entering the mixture output pipeline. A water input pipeline sequentially passes water through a second flow meter, a water flow regulating valve, and a second check valve before entering the mixture output pipeline. The polymer mother liquor, after passing through the low-shear flow regulating valve, precisely regulates its flow rate before entering the mixture output pipeline, where it is mixed with water in a static mixer to prepare the desired polymer target liquid, which is then injected into the oil well via pipeline.

[0027] The low-shear flow regulating valve of this application can significantly reduce the shear force on the polymer mother liquor, ensuring a high viscosity retention rate. A first flow meter provides real-time flow feedback to adjust the opening of the low-shear flow regulating valve, ensuring the actual flow rate meets requirements. A first check valve is installed at the outlet of the low-shear flow regulating valve to prevent backflow of the mixed medium, which could affect the polymer concentration before mixing and ensure the mixed medium meets design requirements. A second flow meter provides real-time flow feedback to adjust the water flow regulating valve, ensuring the actual flow rate meets requirements. A second check valve is installed at the outlet of the water flow regulating valve to prevent backflow of the mixed medium, which could affect the injection water quality and ensure the mixed medium meets design requirements. This application is prefabricated as a skid, with a compact structure, facilitating intelligent on-site control and reducing labor and space requirements. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural front view of an embodiment of this application;

[0030] Figure 2 This is a top view of the structure of an embodiment of this application;

[0031] Figure 3 This is a left view of the structure of an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the sampler in an embodiment of this application;

[0033] Figure 5 This is a schematic diagram of the structure of the low shear flow regulating valve according to an embodiment of this application;

[0034] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0035] Figure label:

[0036] 10. Polymer inlet line; 11. First flow meter; 12. Low shear flow regulating valve; 13. First check valve; 14. First pressure sensor; 15. Fourth valve; 16. First electric controller;

[0037] 20. Water inlet pipeline; 21. Second flow meter; 22. Water flow regulating valve; 23. Second check valve; 24. Second electric controller; 25. Second pressure sensor; 26. First pressure transmitter;

[0038] 30. Mixture output pipeline; 31. Static mixer; 32. Third check valve; 33. T-connector; 34. Dosing pipeline; 35. Third valve; 36. Third pressure sensor; 37. Second pressure transmitter; 38. Fifth valve;

[0039] 40. Skid body; 50. First polymer injection module; 60. Second polymer injection module; 70. Sampler; 71. Sampling branch pipeline; 72. First valve; 73. Sampling chamber; 74. Piston; 75. Guide rod; 76. Second valve; 77. Drive spring;

[0040] 121. Valve body; 122. Valve sleeve; 123. Valve stem; 124. Flange; 125. Valve cavity; 126. Flow guide groove. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] This application provides a high-pressure polymer injection skid for oil extraction, which can solve the problems in related technologies where the viscosity of the injected liquid decreases when subjected to shear force during the flow of polymer solution preparation equipment, and where the construction cycle of polymer solution preparation equipment is long, the area occupied is large, and it cannot be reused.

[0043] See Figures 1 to 3 As shown in the figure, this application provides a high-pressure polymer injection skid for oil extraction, comprising:

[0044] A polymer inlet pipeline 10 is provided, on which a first flow meter 11, a low-shear flow regulating valve 12, and a first check valve 13 are sequentially connected along the flow direction of the polymer. The first flow meter 11 provides flow feedback and adjusts the opening of the low-shear flow regulating valve 12 in real time, thereby ensuring that the actual flow of the low-shear flow regulating valve 12 meets the requirements. A first check valve 13 is installed at the outlet of the low-shear flow regulating valve 12 to prevent backflow of the mixed medium, which would affect the concentration of the polymer before mixing and ensure that the mixed medium meets the design requirements.

[0045] Water injection pipeline 20, along the water flow direction, is connected in sequence to a second flow meter 21, a water flow regulating valve 22, and a second check valve 23. The second flow meter 21 provides feedback on the flow rate and adjusts the water flow regulating valve 22 in real time to ensure that the actual flow rate of the water flow regulating valve 22 meets the requirements. The second check valve 23 is installed at the outlet of the water flow regulating valve to prevent the backflow of the mixed medium, which would affect the quality of the injected water and ensure that the mixed medium meets the design requirements.

[0046] The mixture output pipeline 30 has its inlet connected to the outlets of the polymer input pipeline 10 and the water injection pipeline 20, respectively. A static mixer 31 and a third check valve 32 are connected to the mixture output pipeline 30. The polymer mother liquor, after passing through the low-shear flow regulating valve 12, precisely regulates its flow rate into the mixture output pipeline 30. In the static mixer 31, it is mixed with water to prepare the desired polymer target liquid, which is then injected into the oil well via pipeline. The third check valve 32 prevents the polymer target liquid in the mixture output pipeline 30 from flowing back.

[0047] In this embodiment of the oil well application, a high-pressure polymer injection skid is used to deliver polymer mother liquor via polymer input pipeline 10, which flows sequentially through a first flow meter 11, a low-shear flow regulating valve 12, and a first check valve 13 before entering the mixture output pipeline 30. Water input pipeline 20 delivers water sequentially through a second flow meter 21, a water flow regulating valve 22, and a second check valve 23 before entering the mixture output pipeline 30. The polymer mother liquor, after passing through the low-shear flow regulating valve 12, has its flow rate precisely regulated before entering the mixture output pipeline 30. In the static mixer 31, it is mixed with water to prepare a polymer target liquid of the desired concentration, which is then injected into the oil well via pipeline.

[0048] The low-shear flow regulating valve 12 of this application can significantly reduce the shear force on the polymer mother liquor, ensuring that the polymer mother liquor has a high viscosity retention rate. The first flow meter 11 provides feedback flow and adjusts the opening of the low-shear flow regulating valve 12 in real time, thereby ensuring that the actual flow of the low-shear flow regulating valve 12 meets the requirements. A first check valve 13 is provided at the outlet of the low-shear flow regulating valve 12 to prevent the backflow of the mixed medium, which would affect the concentration of the polymer before mixing and ensure that the medium meets the design requirements after mixing.

[0049] The second flow meter 21 provides feedback on the flow rate to real-time adjust the water flow regulating valve 22, ensuring that the actual flow rate of the water flow regulating valve 22 meets the requirements. A second check valve 23 is installed at the outlet of the water flow regulating valve 22 to prevent the mixed medium from flowing back and affecting the quality of the injected water, ensuring that the mixed medium meets the design requirements. The polymer inlet pipeline 10, the water injection inlet pipeline 20, and the mixture outlet pipeline 30 of this application can be prefabricated as a skid, with a compact structure, facilitating intelligent on-site control and reducing labor and site requirements.

[0050] In some alternative embodiments: see Figures 1 to 3 As shown in the figure, this application embodiment provides a high-pressure polymer injection skid for oil extraction. The high-pressure polymer injection skid for oil extraction also includes a skid body 40, which is a rectangular frame structure formed by connecting profiles. The polymer inlet pipe 10, the water inlet pipe 20, and the mixture outlet pipe 30 are all fixedly connected to the skid body 40.

[0051] The polymer inlet pipe 10, water inlet pipe 20, and mixture outlet pipe 30 are each provided in two sets. One set of polymer inlet pipe 10, water inlet pipe 20, and mixture outlet pipe 30 are interconnected to form a first polymer injection module 50. The other set of polymer inlet pipe 10, water inlet pipe 20, and mixture outlet pipe 30 are interconnected to form a second polymer injection module 60. The first polymer injection module 50 and the second polymer injection module 60 are symmetrically spaced within the skid body 40.

[0052] The first polymer injection module 50 and the second polymer injection module 60 can inject polymer target fluid into two oil wells separately or simultaneously, or they can inject polymer target fluid into one oil well together, which improves the flexibility and efficiency of using high-pressure polymer injection skids in oil development.

[0053] In some alternative embodiments: see Figure 4 As shown in the figure, this application embodiment provides a high-pressure polymer injection skid for oil extraction, wherein the mixture output pipeline 30 of the high-pressure polymer injection skid is connected to a sampler 70. The sampler 70 includes a sampling branch pipeline 71 connected to the mixture output pipeline 30, a first valve 72 connected to the sampling branch pipeline 71, a sampling chamber 73 connected to the outlet of the sampling branch pipeline 71, and a second valve 76 connected to the sampling chamber 73 for discharging the sample.

[0054] A piston 74 is slidably and sealed within the sampling chamber 73. A guide rod 75, connected to the piston 74, is located within the sampling chamber 73. A drive spring 77, which drives the piston 74 to slide towards the sampling branch pipe 71, is fitted onto the guide rod 75. When the first valve 72 is opened, the high-pressure polymer target liquid located in the mixture output pipe 30 enters the sampling chamber 73. The polymer target liquid drives the piston 74 within the sampling chamber 73 to slide away from the sampling branch pipe 71, compressing the drive spring 77 and storing energy.

[0055] When a set volume of polymer target liquid sample is collected in sampling chamber 73, the first valve 72 is closed. Then the second valve 76 is opened, and the polymer target liquid sample in sampling chamber 73 is slid towards sampling branch pipe 71 by driving piston 74 driven by drive spring 77. After the polymer target liquid sample in sampling chamber 73 is discharged from the second valve 76, its viscosity is measured.

[0056] In some alternative embodiments: see Figure 1 As shown in the embodiment of this application, a high-pressure polymer injection skid is provided for oil extraction. The inlet of the mixture output pipeline 30 of the high-pressure polymer injection skid is connected to the outlet of the polymer input pipeline 10 and the outlet of the water injection pipeline 20 respectively through a tee connector 33. A dosing pipeline 34 is provided upstream of the static mixer 31 for the mixture output pipeline 30, and a third valve 35 is connected to the dosing pipeline 34.

[0057] In this embodiment, a dosing line 34 is provided upstream of the static mixer 31 in the mixture output line 30. This dosing line 34 has two sets, and each set is equipped with a third valve 35. The two sets of dosing lines 34 are used to add flocculant, etc., into the mixture output line 30, respectively. The third valve 35 is used to control the on / off state or flow rate of the dosing lines 34.

[0058] In some alternative embodiments: see Figure 1 As shown in the embodiment of this application, a high-pressure polymer injection skid for oil extraction is provided. The polymer input pipeline 10 of the high-pressure polymer injection skid for oil extraction is located upstream of the first flow meter 11 and is connected to a first pressure sensor 14 and a fourth valve 15. The first pressure sensor 14 is used to detect the pressure value of the polymer mother liquor entering the polymer input pipeline 10, and the fourth valve 15 is used to control the on / off position or flow rate of the polymer input pipeline 10 inlet.

[0059] The water inlet pipe 20 is located upstream of the second flow meter 21 and is connected to a second pressure sensor 25 and a first pressure transmitter 26. The second pressure sensor 25 and the first pressure transmitter 26 are used to detect the pressure value of the water flow entering the water inlet pipe 20. The first pressure transmitter 26 can be connected to a display instrument through a line, and the display instrument displays the pressure value of the water flow in the water inlet pipe 20.

[0060] The mixture output line 30, located downstream of the third check valve 32, is connected to a third pressure sensor 36, a second pressure transmitter 37, and a fifth valve 38. The third pressure sensor 36 and the second pressure transmitter 37 are used to detect the pressure value of the polymer target liquid in the mixture output line 30. The second pressure transmitter 37 can be connected to a display instrument via a line, which displays the pressure value of the polymer target liquid in the mixture output line 30. The fifth valve 38 can be used to control the on / off position or flow rate of the mixture output line 30 outlet.

[0061] In some alternative embodiments: see Figure 1 , Figure 5 and Figure 6 As shown in the illustration, this application provides a high-pressure polymer injection skid for oil well operations. The low-shear flow regulating valve 12 of the skid is connected to a first electric controller 16, and the water flow regulating valve 22 is connected to a second electric controller 24. The first electric controller 16 is used to automatically control the flow rate of the low-shear flow regulating valve 12, and the second electric controller 24 is used to automatically control the flow rate of the water flow regulating valve 22.

[0062] The low shear flow regulating valve 12 includes a cylindrical valve body 121. Multiple valve sleeves 122 are sequentially connected along the length of the valve body 121 within the valve body 121. A valve stem 123 is slidably connected within each valve sleeve 122. Each valve sleeve 122 has a flange 124 that is slidably and sealingly connected to the valve stem 123. A valve cavity 125 with an inner diameter larger than the outer diameter of the valve stem 123 is formed between two adjacent flanges 124.

[0063] Multiple guide grooves 126 are provided on the outer periphery of the valve stem 123 to connect two adjacent valve chambers 125. The multiple guide grooves 126 are arranged sequentially at intervals along the length of the valve stem 123. The circumferential angle between two adjacent guide grooves 126 along the length of the valve stem 123 is 90-270°, and two guide grooves 126 are symmetrically arranged at the same axial position of the valve stem 123. The shape of the guide grooves 126 is preferably, but not limited to, a "(" shape, "〔" shape, etc.

[0064] The output end of the first electric controller 16 is connected to the valve stem 123 and drives the valve stem 123 to slide back and forth in the valve sleeve 122. When the first electric controller 16 drives the multiple guide grooves 126 on the valve stem 123 to be located in the valve cavity 125, the valve stem 123 is sealed to the flange 124 to close the two adjacent valve cavities 125. At this time, the low shear flow regulating valve 12 is in the cut-off state.

[0065] When the first electric actuator 16 drives the multiple guide grooves 126 on the valve stem 123 to be located within the valve chamber 125 and the flange 124, a medium flow channel is formed between the multiple guide grooves 126 on the valve stem 123 and the flange 124, opening and connecting two adjacent valve chambers 125. At this time, the low shear flow regulating valve 12 is in the open state. By adjusting the axial position between the multiple guide grooves 126 and the valve chamber 125 and the flange 124, the cross-sectional size of the medium flow channel can be adjusted, thereby adjusting the flow rate of the low shear flow regulating valve 12.

[0066] Working principle

[0067] This application provides a high-pressure polymer injection skid for oil extraction. The high-pressure polymer injection skid for oil extraction is equipped with a polymer input pipeline 10, on which a first flow meter 11, a low-shear flow regulating valve 12, and a first check valve 13 are sequentially connected along the polymer flow direction; a water injection pipeline 20, on which a second flow meter 21, a water flow regulating valve 22, and a second check valve 23 are sequentially connected along the water flow direction; and a mixture output pipeline 30, whose inlet is connected to the outlets of the polymer input pipeline 10 and the water injection pipeline 20, respectively, and whose outlet is connected to a static mixer 31 and a third check valve 32.

[0068] Therefore, the oil well using the high-pressure polymer injection skid of this application utilizes a polymer input pipeline to sequentially flow the polymer mother liquor through a first flow meter 11, a low-shear flow regulating valve 12, and a first check valve 13 before entering the mixture output pipeline 30. A water injection pipeline 20 sequentially flows water through a second flow meter 21, a water flow regulating valve 22, and a second check valve 23 before entering the mixture output pipeline 30. The polymer mother liquor, after passing through the low-shear flow regulating valve 12, precisely regulates its flow rate before entering the mixture output pipeline 30. In the static mixer 31, it is mixed with water to prepare the desired polymer target liquid, which is then injected into the oil well via pipeline.

[0069] The low-shear flow regulating valve 12 of this application can significantly reduce the shear force on the polymer mother liquor, ensuring a high viscosity retention rate. The first flow meter 11 provides feedback flow to adjust the opening of the low-shear flow regulating valve 12 in real time, ensuring the actual flow rate of the valve meets requirements. A first check valve 13 is installed at the outlet of the low-shear flow regulating valve 12 to prevent backflow of the mixed medium, which could affect the concentration of the polymer before mixing and ensure that the mixed medium meets design requirements. The second flow meter 21 provides feedback flow to adjust the water flow regulating valve 22 in real time, ensuring the actual flow rate of the water flow regulating valve 22 meets requirements. A second check valve 23 is installed at the outlet of the water flow regulating valve 22 to prevent backflow of the mixed medium, which could affect the injection water quality and ensure that the mixed medium meets design requirements. This application is prefabricated on a skid, with a compact structure, facilitating intelligent on-site control and reducing labor and space requirements.

[0070] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0071] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high-pressure polymer injection skid for oil extraction, characterized in that, include: A polymer inlet pipe (10) is provided, on which a first flow meter (11), a low shear flow regulating valve (12) and a first check valve (13) are connected in sequence along the flow direction of the polymer. Water injection pipeline (20), on which a second flow meter (21), a water flow regulating valve (22), and a second check valve (23) are connected in sequence along the water flow direction; The mixture output pipeline (30) has its inlet connected to the outlets of the polymer input pipeline (10) and the water injection input pipeline (20), respectively. A static mixer (31) and a third check valve (32) are connected to the mixture output pipeline (30).

2. The high-pressure polymer injection skid for oil extraction as described in claim 1, characterized in that: It also includes a skid body (40), which is a rectangular frame structure formed by connecting profiles. The polymer input pipe (10), water input pipe (20) and mixture output pipe (30) are all fixedly connected to the skid body (40).

3. The high-pressure polymer injection skid for oil extraction as described in claim 2, characterized in that: The polymer input pipeline (10), water input pipeline (20) and mixture output pipeline (30) are each provided in two sets. One set of the polymer input pipeline (10), water input pipeline (20) and mixture output pipeline (30) is interconnected to form the first polymer injection module (50). Another set of polymer input pipes (10), water input pipes (20) and mixture output pipes (30) are interconnected to form a second polymer injection module (60). The first polymer injection module (50) and the second polymer injection module (60) are symmetrically spaced within the skid body (40).

4. A high-pressure polymer injection skid for oil extraction as described in any one of claims 1 to 3, characterized in that: The mixture output pipeline (30) is connected to a sampler (70), the sampler (70) includes a sampling branch pipeline (71) connected to the mixture output pipeline (30), a first valve (72) is connected to the sampling branch pipeline (71), the outlet of the sampling branch pipeline (71) is connected to a sampling chamber (73), and the sampling chamber (73) is connected to a second valve (76) for discharging the sample.

5. A high-pressure polymer injection skid for oil extraction as described in claim 4, characterized in that: A piston (74) is slidably and sealed inside the sampling chamber (73). A guide rod (75) is provided inside the sampling chamber (73) to connect the piston (74). A drive spring (77) is sleeved on the guide rod (75) to drive the piston (74) to slide in a direction close to the sampling branch pipe (71).

6. The high-pressure polymer injection skid for oil extraction as described in claim 1, characterized in that: The inlet of the mixture output pipeline (30) is connected to the outlet of the polymer input pipeline (10) and the water injection input pipeline (20) respectively through a three-way connector (33). The mixture output pipeline (30) is located upstream of the static mixer (31) and is provided with a dosing pipeline (34). A third valve (35) is connected to the dosing pipeline (34).

7. A high-pressure polymer injection skid for oil extraction as described in claim 1, characterized in that: The polymer inlet pipe (10) is located upstream of the first flow meter (11) and is connected to the first pressure sensor (14) and the fourth valve (15); The water injection inlet pipe (20) is located upstream of the second flow meter (21) and is connected to the second pressure sensor (25) and the first pressure transmitter (26); The mixture output pipeline (30) is located downstream of the third check valve (32) and is connected to the third pressure sensor (36), the second pressure transmitter (37) and the fifth valve (38).

8. A high-pressure polymer injection skid for oil extraction as described in claim 1, characterized in that: The low shear flow regulating valve (12) is connected to a first electric controller (16), and the water flow regulating valve (22) is connected to a second electric controller (24).

9. A high-pressure polymer injection skid for oil extraction as described in claim 1, characterized in that: The low shear flow regulating valve (12) includes a cylindrical valve body (121), and multiple valve sleeves (122) are provided inside the valve body (121) in sequence along the length direction of the valve body (121). A valve stem (123) is slidably connected inside the valve sleeves (122). Each of the valve sleeves (122) is provided with a flange (124) that is slidably and sealingly connected to the valve stem (123), and a valve cavity (125) with an inner diameter larger than the outer diameter of the valve stem (123) is formed between two adjacent flanges (124); The valve stem (123) is provided with a plurality of guide grooves (126) on its outer periphery for connecting two adjacent valve chambers (125), and the plurality of guide grooves (126) are arranged sequentially at intervals along the length direction of the valve stem (123).

10. A high-pressure polymer injection skid for oil extraction as described in claim 9, characterized in that: The angle between two adjacent guide grooves (126) along the length direction of the valve stem (123) is 90°-270°, and two guide grooves (126) are symmetrically provided at the same axial position of the valve stem (123).

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