A assisted polymer sampler

Abstract

This invention relates to a assisted polymer sampler, comprising a media shell I equipped with a sliding cylinder and a media shell II equipped with a sampling piston and an assist spring, connected by a media shell connector to form media chamber I and media chamber II. Liquid guiding valves I and II, installed on both sides of the media shell connector, control liquid guiding holes I and II with different apertures within the media shell connector, which communicate with media chamber I and media chamber II respectively. The sampling piston is fixedly connected to a guide rod passing through the sliding cylinder, media shell connector, and assist spring. An exhaust and liquid filling valve is installed at the upper end of the sliding cylinder, which can slide up and down within media shell I. The lower end of media shell II can connect to a wellhead liquid guiding valve, and the sampling valve communicates with the sample chamber of media shell II. This invention ensures the normal operation of polymer injection well sampling, reduces mechanical shearing of the sample, improves sample accuracy and quality, reduces the height of the device, and facilitates operation, demonstrating significant practical benefits.

Description

Technical Field

[0001] This utility model relates to a sampling device for polymer injection wells in the petroleum industry, and in particular to an assisted polymer sampler. Background Technology

[0002] As oilfield development enters its mid-to-late stages, polymer injection becomes increasingly important. Polyacrylamide (hereinafter referred to as polymer) is a water-soluble high-molecular-weight polymer. Injecting polymers into water injection wells can improve the rheological properties of the displacing fluid, increase water drive efficiency, expand the swept volume, and thus enhance oil recovery. With the increasing number of polymer injection wells, each well and pump station requires frequent sampling and testing of the injected polymer. Analyzing the concentration and viscosity of the polymer solution ensures it meets the oil displacement design requirements; too low a polymer viscosity will reduce oil displacement efficiency, while too high a viscosity may clog formation pores.

[0003] Currently, the samplers used on-site experience mechanical shearing during the opening and closing process due to the sudden change in flow velocity caused by the high-speed flow of the polymer solution. This shearing action leads to a loss of polymer viscosity, interfering with the final test results. On-site personnel typically reduce the sampling speed to minimize shear loss. This method is time-consuming and labor-intensive, resulting in low sampling efficiency. Furthermore, it has the following drawbacks: 1. Because the existing samplers have a separate spring cylinder, the device is long and installed at a considerable height after the polymer injection well, making operation inconvenient and posing a risk of personnel falling while working at height.

[0004] 2. If the piston in the spring cylinder is not in position or malfunctions due to jamming, normal sampling cannot be performed. The frictional resistance at the sampling piston, spring cylinder piston, etc. is large, resulting in low sensitivity of the sampling piston. The sampling piston is prone to not being in position or jamming, and normal sampling cannot be performed. 3. The pressure in the spring cylinder and the sampling cylinder is prone to imbalance. The hydraulic oil cannot push the spring cylinder piston upward through the vertical through hole equipped with a check valve. The adjustment range is small, which affects the sampling accuracy and sampling speed.

[0005] In summary, sampling is time-consuming and results in significant viscosity loss, making it impossible to accurately reflect the injection status of the agent on site. It may even mislead technicians and affect the construction effect. Therefore, it is necessary to design a new type of sampler that can solve the above problems.

[0006] The following patented technologies related to polymer samplers have emerged: Authorization Announcement No. CN208089287U discloses a novel polymer sampler, mainly composed of a fluid pipeline, a fixed joint, a bend joint, a switch, a sampler tank, and a sample container. It achieves this by installing a larger-diameter bend joint at the fixed joint, based on the existing polymer sampler. The bend joint has a larger diameter and a certain degree of curvature, which on the one hand slows down the fluid entry velocity and reduces shear intensity; on the other hand, it eliminates turbulence and reduces fluid viscosity loss by changing the flow direction.

[0007] However, the above device still has a drawback: there are two switches on the sampler tank. The switch away from the bend joint controls the sample release speed and is connected to the sample bottle. When the switch controls the sample release speed, it still shears the sample, affecting the sampling accuracy.

[0008] Authorization Announcement No.: CN103940635A discloses a piston-type polymer sampler for polymer injection wells, comprising a spring cylinder, a partition, and a sampling cylinder. The partition has a vertical through hole and a double L-shaped through hole inside. The vertical through hole communicates with the spring cylinder and the sampling cylinder and is equipped with a one-way valve. The double L-shaped through hole communicates with the spring cylinder, the sampling cylinder, and the outside. The vertical channel outlet communicating with the sampling cylinder is equipped with a flow-limiting screw, and the horizontal channel outlet communicating with the outside is equipped with a needle valve. The sampling cylinder contains a sampling cylinder piston and is driven by hydraulic oil. The lower end of the sampling cylinder is welded with a bottom cover. The vertical through hole of the bottom cover is threadedly connected to the well pipe ball valve, and the horizontal through hole on the side of the bottom cover is threadedly connected to the sampling pipe ball valve and the sampling pipe.

[0009] The advantages of the above-mentioned device are: compact structure, convenient operation, convenient and accurate sampling, and high detection accuracy. However, it still has the following defects: the sampling piston is indirectly driven by the spring, the frictional resistance of the sampling piston, spring cylinder piston, etc. is large, and the hydraulic resistance of the vertical through hole and double L-shaped through hole is large, resulting in low sensitivity of the sampling piston, and the sampling piston is prone to not being in place or getting stuck, making it impossible to sample normally; the speed at which the sample enters the sampling cylinder can only be adjusted by the double L-shaped through hole, and the adjustment range is small, which affects the sampling accuracy and sampling speed. Summary of the Invention

[0010] The purpose of this invention is to provide a assisted polymer sampler to address the problems of piston misalignment or jamming in existing polymer samplers, which prevents normal sampling and makes it difficult to adjust the sampling speed. This improved sampler features a compact structure, convenient sampling, high detection accuracy, and prevents sudden changes in liquid flow, effectively mitigating viscosity loss in the polymer solution caused by mechanical shearing. It also improves sampling efficiency and reduces the workload of employees.

[0011] The technical solution of this utility model is: a assisted polymer sampler, including a sampling valve and a sampling piston with a sampling tube, wherein: a medium shell one equipped with a slide cylinder and a medium shell two equipped with a sampling piston and an assisting spring are connected by a medium shell connector to form a medium cavity one and a medium cavity two; a liquid guiding valve one and a liquid guiding valve two installed on both sides of the medium shell connector can control liquid guiding holes one and two with different apertures in the medium shell connector and which are connected to the medium cavity one and the medium cavity two; the sampling piston is fixedly connected to a guide rod passing through the slide cylinder, the medium shell connector and the assisting spring; an exhaust and liquid filling valve is installed at the upper end of the slide cylinder that can slide up and down in the medium shell one; the lower end of the medium shell two can be connected to the wellhead liquid guiding valve, and the sampling valve is connected to the sample cavity of the medium shell two.

[0012] Preferably, the medium shell connector has a central hole and a liquid guide hole one and a liquid guide hole two are provided in the body outside the central hole, as well as assembly holes for liquid guide valve one and liquid guide valve two that communicate with liquid guide hole one and liquid guide hole two; threaded connecting sections are provided at both ends of the body outside the liquid guide hole one and liquid guide hole two to be threadedly connected to medium shell one and medium shell two, and a connector sealing ring one and a connector sealing ring two are provided at the connection between medium shell one and medium shell two and the medium shell connector.

[0013] Preferably, the first liquid guiding hole and the second liquid guiding hole are straight holes or L-shaped holes communicating with the first medium cavity and the second medium cavity; the medium shell connector is connected inside the first medium cavity and the second medium cavity.

[0014] Preferably, the exhaust and liquid filling valve consists of a plug and a safety valve, wherein the safety valve is installed inside the plug, and the plug is installed in the plug thread connection hole of the upper end cylinder of the slide; the safety valve is connected to the medium chamber.

[0015] Preferably, the medium shell is made of stainless steel; the slide is made of polytetrafluoroethylene.

[0016] Preferably, the guide rod passes through the slide end cap installed in the upper body of the slide and the guide rod sealing ring II installed in the central hole of the medium shell connector, and the guide rod sealing ring I is provided between the end cap assembly hole in the upper body of the slide and the slide end cap.

[0017] Preferably, the lower shell of the second medium shell consists of a conical cavity and a straight-hole sample chamber with internal threads at the bottom. The internal threads at the bottom of the sample chamber can be threadedly connected to the wellhead fluid guide valve. The first and second fluid guide valves are needle valves.

[0018] Preferably, the lower piston body of the sampling piston is a cone shape that matches the cone-shaped cavity at the lower part of the medium shell, and the upper body is a cylinder. A piston ring sealing groove is provided in the outer circle of the cylinder of the sampling piston. A concave surface is provided between the upper end face of the sampling piston and the guide rod to form a spring seat, in which an assist spring can be seated.

[0019] Preferably, there is one or more piston ring sealing grooves, and piston rings are installed in the piston ring sealing grooves; the assist spring is installed outside the guide rod between the sampling piston and the medium shell connecting body.

[0020] Preferably, the lubricating medium added to the second medium cavity and the first medium cavity is soapy water, dish soap, or hydraulic oil; the upper end of the guide rod is equipped with a push-pull handle.

[0021] Compared with the prior art, the significant advantages of this utility model are as follows: 1. When the sampling piston is not in place or malfunctions due to jamming, this utility model uses a push-pull handle and guide rod to push and pull the sampling piston to move it, thus ensuring normal sampling.

[0022] 2. The assisting spring in this device is installed in the second medium shell, eliminating the need for a separate piston cylinder and significantly reducing the height of the device. The sampling piston can be directly driven through the guide rod and the assisting spring. The frictional resistance between the sampling piston and the second medium shell is small, making it simple and easy to unblock the sampling piston when it is not in place or malfunctions due to jamming.

[0023] 3. Because of its small length, this device is installed at a relatively low height in the polymer injection well, eliminating the need for climbing to work at heights, making it easy to operate and avoiding the risk of workers falling from heights.

[0024] 4. This device is equipped with two liquid guiding holes. The diameters of liquid guiding hole one and liquid guiding hole two are different. The large diameter and the small diameter are used together to reduce the resistance to the liquid flowing into the device and increase the sensitivity of the sampling piston. This can effectively avoid the sampling piston from being out of position or stuck, and ensure normal sampling.

[0025] 5. Using environmentally friendly liquids as lubricating media, such as soapy water or dish soap water, which do not pollute the environment, can be used as the lubricating media to control the movement speed of the sampling piston. This avoids the environmental pollution caused by leakage when hydraulic oil is used as the lubricating media, and can also reduce production costs.

[0026] 6. This device is equipped with an exhaust and liquid filling valve, which can maintain the pressure balance in medium chamber one and medium chamber two, ensuring the normal operation of the device; when the lubricating medium is depleted, it can be replenished into medium chamber one through the threaded connection hole of the exhaust and liquid filling valve.

[0027] 7. This device is equipped with two liquid guiding valves that communicate with the liquid guiding holes. The two liquid guiding valves control the two liquid guiding holes. The two liquid guiding holes, one large and one small, work together to increase the adjustment range of the flow rate of the lubricating medium in the first medium chamber and the second medium chamber, thus ensuring sampling accuracy and sampling speed.

[0028] 8. The preferred method is to use stainless steel for the medium housing and PTFE (polytetrafluoroethylene) for the slide, ensuring a natural seal between the medium housing and the slide. This results in a large sealing area and excellent sealing performance. The natural seal between the medium housing and the slide eliminates the need for a dedicated sealing ring, reduces frictional resistance, and prevents leakage caused by aging or damage to the sealing ring.

[0029] In summary, this invention ensures the normal operation of polymer injection well sampling, reduces mechanical shearing of the samples, improves sample accuracy and quality, reduces the height of the device, and facilitates operation, demonstrating significant practical benefits. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 yes Figure 1 A schematic diagram of the sampling piston.

[0032] In the diagram: 1. Liquid guiding valve; 2. Sample chamber; 3. Sampling piston; 4. Assist spring; 5. Medium chamber 1; 6. Connecting body sealing ring 1; 7. Liquid guiding valve 1; 8. Liquid guiding hole 1; 9. Connecting body sealing ring 2; 10. Medium chamber 2; 11. Guide rod; 12. Exhaust and liquid filling valve; 13. Push-pull handle; 14. Slide cylinder end cap; 15. Guide rod sealing ring 1; 16. Medium shell 1; 17. Slide cylinder; 18. Liquid guiding hole 2; 19. Liquid guiding valve 2; 20. Guide rod sealing ring 2; 21. Medium shell connecting body; 22. Medium shell 2; 23. Spring seat; 24. Piston ring; 25. Sampling valve; 26. Sampling tube; 27. Wellhead polymer injection pipeline; 28. Piston ring sealing groove. Detailed Implementation

[0033] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," 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 utility model 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 utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] See Figures 1-2 A assisted polymer sampler includes a sampling valve 25 with a sampling tube 26 and a sampling piston 3. A media shell 16 with a slide cylinder 17 and a media shell 22 with the sampling piston 3 and an assist spring 4 are connected by a media shell connector 21 to form media cavities 1-5 and 2-10. Liquid guide valves 1-7 and 2-9 installed on both sides of the media shell connector 21 control liquid guide holes 1-8 and 2-18 with different apertures that communicate with media cavities 1-5 and 2-10. The sampling piston 3 is fixedly connected to a guide rod 11 that passes through the slide cylinder 17, the media shell connector 21, and the assist spring 4. An exhaust and liquid filling valve 12 is installed at the upper end of the slide cylinder 17, which can slide up and down in the media shell 16. The lower end of the media shell 22 can be connected to a wellhead liquid guide valve 1, and the sampling valve 25 communicates with the sample cavity 2 of the media shell 22.

[0037] In this invention, the liquid guiding holes 1-8 and 2-18 in the medium shell connector 21 have different diameters and are controlled by liquid guiding valves 1-7 and 2-19 respectively. This allows for sampling at three different flow rates during polymer sampling, based on the viscosity and properties of the sample, with minimal hydraulic resistance. This effectively mitigates the viscosity loss caused by mechanical shearing of the polymer solution due to sudden changes in flow rate in existing samplers, improving sampling efficiency and sample analysis accuracy. The three flow rates can be achieved through the following operations: 1) opening only the smallest diameter liquid guiding hole 1-8 or 2-18 via liquid guiding valve 1-7 or 2-19; ​​2) opening only the largest diameter liquid guiding hole 1-8 or 2-18 via liquid guiding valve 1-7 or 2-19; ​​3) simultaneously opening both liquid guiding holes 1-8 and 2-18 via liquid guiding valve 1-7 and 2-19.

[0038] This utility model has an exhaust and liquid filling valve 12 installed at the upper end of the slide cylinder 17, which can exhaust gas and add lubricating medium. The gas in the medium chamber 2 10 can be automatically discharged through the exhaust and liquid filling valve 12. When the medium chamber 1 5 lacks lubricating medium, it can be added at the connection of the valve and flow into the medium chamber 1 5 through the liquid guide hole 1 8 and the liquid guide hole 2 18 to lubricate the sampling piston 3.

[0039] If the sampling piston 3 gets stuck or fails to reach its lower position in the medium chamber 5, the guide rod 11 can be used to push the sampling piston 3 downward and pull it upward to assist it and ensure that the sampling work proceeds normally.

[0040] The assist spring 4 is installed in the medium chamber 5, eliminating the need for a separate spring cylinder. This saves assembly space, significantly reduces the manufacturing height of the sampler, and avoids safety hazards caused by personnel working at heights.

[0041] Based on the above embodiment one, the present invention also has the following embodiments: In a preferred embodiment: the medium shell connector 21 has a central hole, and a liquid guide hole 18 and a liquid guide hole 28 are provided in the body outside the central hole, as well as assembly holes for liquid guide valve 1 7 and liquid guide valve 2 19 communicating with the liquid guide hole 1 8 and liquid guide hole 2 18; threaded connecting sections are provided at both ends of the body outside the liquid guide hole 1 8 and liquid guide hole 2 18 to be threadedly connected to the medium shell 1 16 and the medium shell 2 22, and a connector sealing ring 1 6 and a connector sealing ring 2 9 are provided at the connection between the medium shell 1 16 and the medium shell 2 22 and the medium shell connector 21.

[0042] In a preferred embodiment: the first liquid guide hole 8 and the second liquid guide hole 18 are straight holes or L-shaped holes communicating with the first medium cavity 5 and the second medium cavity 10; the medium shell connector 21 is connected inside the first medium cavity 5 and the second medium cavity 10, and can be used as the upper limit for the sampling piston 3.

[0043] In a preferred embodiment, the venting and liquid-adding valve 12 consists of a plug and a safety valve. The safety valve is installed inside the plug, and the plug is installed in the threaded connection hole of the upper cylinder of the slide cylinder 17. The safety valve is connected to the second medium chamber 10. When it is necessary to add lubricating medium into this sampler, the plug in the venting and liquid-adding valve 12 is removed, and the plug and safety valve are removed together from the threaded connection hole in the slide cylinder 17. Lubricating medium is then added through this threaded connection hole. When there is gas in the second medium chamber 10, the gas filling the second medium chamber 10 can be automatically discharged through the safety valve, ensuring the normal operation of the sampling work.

[0044] In a preferred embodiment: the medium shell 16 is made of stainless steel; the slide 17 is made of polytetrafluoroethylene (PTFE). The medium shell 16 and the slide 17 form a natural seal, eliminating the need for a dedicated sealing ring. This results in low frictional resistance, a large sealing area, resistance to deformation, and excellent sealing performance. It avoids the aging damage and leakage issues that can easily occur when using sealing rings.

[0045] In a preferred embodiment, the guide rod 11 passes through the slide end cap 14 installed in the upper body of the slide cylinder 17 and the guide rod sealing ring 20 installed in the center hole of the medium shell connector 21. A guide rod sealing ring 15 is provided between the end cap assembly hole in the upper body of the slide cylinder 17 and the slide end cap 14 to ensure a seal between the guide rod 11 and the end cap 14.

[0046] In a preferred embodiment: the lower shell of the second medium shell 22 is composed of a conical cavity and a straight-hole sample chamber 2 with internal threads at the bottom. The internal threads at the bottom of the sample chamber 2 can be threadedly connected to the wellhead fluid guide valve 1; the first fluid guide valve 7 and the second fluid guide valve 19 are needle valves.

[0047] In a preferred embodiment: the lower piston body of the sampling piston 3 is a cone-shaped body that matches the cone-shaped cavity at the lower part of the medium shell 22, and the upper body is a cylinder. A piston ring sealing groove 28 is provided in the outer circle of the cylinder of the sampling piston 3. A concave surface is provided between the upper end face of the sampling piston 3 and the guide rod 11 to form a spring seat 23, in which the assist spring 4 can be seated.

[0048] In a preferred embodiment, the piston ring sealing groove 28 is provided in one or more locations, and a piston ring 24 is installed in the piston ring sealing groove 28; the assist spring 4 is installed outside the guide rod 11 between the sampling piston 3 and the medium shell connecting body 21. The conical body at the lower part of the sampling piston 3 and the piston ring 24 can ensure the sealing performance of this sampler. The sampling piston 3 is directly driven by the assist spring 4, and the frictional resistance between the sampling piston 3 and the medium cavity 5 is small.

[0049] In a preferred embodiment, the lubricating medium added to the second medium chamber 10 and the first medium chamber 5 is soapy water, dish soap solution, or hydraulic oil; the upper end of the guide rod 11 is equipped with a push-pull handle 13, making it convenient and quick to operate the sampling piston 3. This sampler uses soapy water, dish soap solution, or hydraulic oil as the medium to control the movement speed of the sampling piston 3. Soapy water or dish soap solution is preferred among the above lubricating media to avoid environmental pollution caused by leakage when using hydraulic oil as the medium, and also to reduce operating costs.

[0050] The method of using this utility model is as follows: 1. Installation of the sampler and addition of lubricating medium; Connect the sampler to the wellhead injection pipeline 27 via the wellhead liquid guide valve 1 through a threaded connection; Close the wellhead liquid guide valve 1, sampling valve 25, liquid guide valve one 7 and liquid guide valve two 19, remove the venting and liquid adding valve 12, and then inject soapy water or detergent water into the medium chamber two 10 through the threaded connection hole where the venting and liquid adding valve 12 is installed; Adjust and open the liquid guide valve one 7 and the liquid guide valve two 19 so that the lubricating medium enters the medium chamber one 5 through the liquid guide hole one 8 and the liquid guide hole two 18; After the lubricating medium is added, install and close the venting and liquid adding valve 12, and at the same time close the liquid guide valve one 7 and the liquid guide valve two 19.

[0051] Sampling operation: Open the wellhead liquid guide valve 1. Due to the incompressible nature of the liquid volume of the lubricating medium in the medium chamber 5 and above the sampling piston 3, the polymer solution from the wellhead polymer injection line 27 cannot enter the sample chamber 2 temporarily.

[0052] First, slowly open the smaller orifice guide valve, then adjust the opening of the larger orifice guide valve. For example, if the orifice of guide valve 18 is small, open it slowly; if the orifice of guide valve 29 is large, adjust the opening speed. The flow rate of the adjusted opening is greater than the flow rate of the slow opening. This prevents the lubricating medium in medium chamber 20 from rapidly entering medium chamber 15, which would cause the sampling piston 3 to move rapidly upward, resulting in high-speed flow of the polymer solution under a large pressure difference and shearing of the polymer solution. The lubricating medium in medium chamber 20 enters medium chamber 15 at a reasonable flow rate, and the polymer solution enters sample chamber 2 slowly through wellhead guide valve 1. At this time, under the pressure in the wellhead injection line 27, the polymer solution generates an upward force pushing the sampling piston 3, compressing the assist spring 4, and the polymer solution begins to enter the space below the sampling piston 3 in medium chamber 15.

[0053] Since the diameters of liquid guide hole 18 and liquid guide hole 28 are different, the polymer solution is usually allowed to enter the medium chamber 20 by adjusting the opening of the liquid guide valve 29 with the larger diameter.

[0054] During this process, the sampling piston 3, guide rod 11 and slide cylinder 17 slide upward; if there is gas in the upper medium chamber 10, it can be discharged through the safety valve in the exhaust and liquid filling valve 12, and part of the polymer solution enters the medium chamber 5 at the lower part of the sampling piston 3.

[0055] As the polymer solution in the medium cavity 5 increases, when the sampling piston 3 moves upward to the position of the medium connector 21 in the medium cavity 5, the sampling piston 3 can no longer move upward, indicating that the sampling quantity has reached the target.

[0056] At this time, close the wellhead fluid guide valve 1 and open the sampling valve 25. The polymer sample fluid in medium chamber 1 5 flows out through the sampling tube 26 under the action of the assist spring 4. As the polymer sample fluid is discharged and the assist spring 4 acts, the sampling piston 3 moves downward and gradually resets. The lubricating medium in medium chamber 2 10 flows back to medium chamber 1 5 through fluid guide hole 1 8 and fluid guide hole 2 18. If the sampling piston 3 does not fully reset, it can be reset by pressing the push-pull handle 13.

[0057] 5. If the sampling piston 3 is at the bottom of the medium cavity 5, that is, when the cone-shaped body at the bottom of the sampling piston 3 is in a "locked" state with the inner surface of the cone-shaped cavity at the bottom of the medium cavity 5, it proves that the polymer sample has completely flowed out. Close the sampling valve 25, close the liquid guide valve 7 and the liquid guide valve 19, and the sampling ends.

[0058] By adjusting the flow rate of the polymer solution entering the sampler using the first liquid guide valve 7 and the second liquid guide valve 19, the flow rate of the polymer solution becomes more stable, effectively mitigating the side effects of mechanical shearing on the solution.

[0059] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A assisted polymer sampler, comprising a sampling valve with a sampling tube and a sampling piston, characterized in that, Medium shell 1, equipped with a sliding cylinder, and medium shell 2, equipped with a sampling piston and a booster spring, are connected by a medium shell connector to form medium cavity 1 and medium cavity 2. Liquid guide valve 1 and liquid guide valve 2, installed on both sides of the medium shell connector, can control liquid guide holes 1 and 2 with different orifice diameters in the medium shell connector and are connected to medium cavity 1 and medium cavity 2. The sampling piston is fixedly connected to a guide rod that passes through the sliding cylinder, the medium shell connector, and the booster spring. An exhaust and liquid filling valve is installed at the upper end of the sliding cylinder, which can slide up and down in medium shell 1. The lower end of medium shell 2 can be connected to the wellhead liquid guide valve, and the sampling valve is connected to the sample cavity of medium shell 2.

2. The assisted polymer sampler as described in claim 1, characterized in that, The medium shell connector is provided with a central hole and liquid guide hole one and liquid guide hole two are provided in the body outside the central hole, as well as assembly holes for liquid guide valve one and liquid guide valve two that communicate with liquid guide hole one and liquid guide hole two; threaded connecting sections are provided at both ends of the body outside liquid guide hole one and liquid guide hole two to be threadedly connected to medium shell one and medium shell two, and connector sealing ring one and connector sealing ring two are provided at the connection between medium shell one and medium shell two and the medium shell connector.

3. A assisted polymer sampler as described in claim 1 or 2, characterized in that, The first and second liquid guiding holes are straight holes or L-shaped holes that communicate with the first and second media cavities; the media shell connector is connected inside the first and second media cavities.

4. The assisted polymer sampler as described in claim 1, characterized in that, The exhaust and liquid filling valve consists of a plug and a safety valve. The safety valve is installed inside the plug, and the plug is installed in the threaded connection hole of the upper end of the slide cylinder. The safety valve is connected to the medium chamber.

5. The assisted polymer sampler as described in claim 2, characterized in that, The medium shell is made of stainless steel; the slide is made of polytetrafluoroethylene.

6. The assisted polymer sampler as described in claim 2, characterized in that, The guide rod passes through the slide end cap installed in the upper body of the slide and the guide rod sealing ring II installed in the center hole of the medium shell connector. The guide rod sealing ring I is provided between the end cap assembly hole in the upper body of the slide and the slide end cap.

7. The assisted polymer sampler as described in claim 2, characterized in that, The lower shell of the second medium shell consists of a conical cavity and a straight-hole sample chamber with internal threads at the bottom. The internal threads at the bottom of the sample chamber can be threaded to the wellhead fluid guide valve. The first and second fluid guide valves are needle valves.

8. The assisted polymer sampler as described in claim 7, characterized in that, The lower piston body of the sampling piston is a cone shape that matches the cone-shaped cavity at the lower part of the medium shell, and the upper body is a cylinder. A piston ring sealing groove is provided in the outer circle of the cylinder of the sampling piston. A concave surface is provided between the upper end face of the sampling piston and the guide rod to form a spring seat, in which an assist spring can be seated.

9. The assisted polymer sampler as described in claim 8, characterized in that, The piston ring sealing groove is provided in one or more places, and a piston ring is installed in the piston ring sealing groove; the assist spring is installed outside the guide rod between the sampling piston and the medium shell connecting body.

10. The assisted polymer sampler as described in claim 3, characterized in that, The lubricating medium added to the second and first media chambers is soapy water, dish soap, or hydraulic oil; the upper end of the guide rod is equipped with a push-pull handle.

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