Dynamic paraffin removal and control experimental device

Abstract

According to the dynamic paraffin removal and inhibition experiment device, the container and a paraffin removal and inhibition agent in the container can rotate around the rotating axis by arranging the container on the rotating assembly, the connecting part, connected with the container, in the upper cover of the container rotates along with the container, and the main body part rotationally connected with the connecting part and the paraffin precipitation pipe installed on the main body part are static; the flow state of the paraffin remover and inhibitor in a shaft in production practice is simulated, so that the experimental state of the paraffin remover and inhibitor is matched with the actual use state, and the purpose of improving the accuracy of an indoor experimental evaluation result of the paraffin remover and inhibitor is achieved.

Description

Technical Field

[0001] The utility model relates to the field of experimental equipment, in particular to a dynamic wax cleaning and prevention experimental device. Background Art

[0002] Wellbore wax deposition is a common problem in the oil well production process. As waxy crude oil flows in the wellbore, wax deposition may occur as the temperature and pressure decrease. The wax deposited on the inner wall of the oil pipe causes the wellbore flow channel to narrow, reducing the oil well production. In severe cases, it may even cause the oil pipe to be blocked and the oil well to stop production.

[0003] Currently, there are various wellbore paraffin removal and prevention processes, among which chemical agents are widely used due to their wide adaptability, high efficiency, and simple operation. However, existing indoor evaluations of paraffin removal and prevention agents are mostly static experiments, that is, the experiments are conducted with the paraffin removal and prevention agent in a static state. In practice, paraffin removal and prevention agents are in a fluid state in the wellbore. This discrepancy between experimental and actual conditions makes the current indoor evaluation results of paraffin removal and prevention agents inaccurate. Utility Model Content

[0004] The utility model discloses a dynamic wax removal and prevention experimental device, which realizes indoor test evaluation of a wax removal and prevention agent in a flowing state.

[0005] To achieve the above-mentioned purpose, the utility model provides a dynamic wax removal and prevention experimental device, including a wax deposition tube and:

[0006] a rotating assembly, the rotating assembly rotating about a rotation axis;

[0007] a container, the container being mounted on the rotating assembly;

[0008] The container cover is used to seal the container. The container cover includes a main body and a connecting portion. The main body is coaxially arranged with the rotation axis. The wax-binding tube is connected to the main body and at least partially extends into the container. The connecting portion is used to be sealed with the container and is rotationally connected to the main body. In practice, the wax cleaning and preventative agent to be tested is placed in the container. The rotating assembly drives the container and the connecting portion to rotate, thereby driving the wax cleaning and preventative agent in the container to rotate. Due to the rotational connection between the main body and the connecting portion, the main body and the wax-binding tube thereon have a certain speed relative to the wax cleaning and preventative agent, thereby providing conditions for dynamic testing of the wax cleaning and preventative agent.

[0009] As an optional embodiment, the wax deposition tube is at least partially offset from the rotation axis. As can be seen from the above, the speed of the wax removal and prevention agent decreases from the edge of the container to the rotation axis. The eccentric setting of the wax deposition tube is conducive to obtaining experimental data at a higher flow rate of the wax removal and prevention agent.

[0010] As an optional embodiment, the waxing tube includes a root, a middle section and an end connected in sequence, the root is connected to the main body, the root is coaxially arranged with the rotation axis, and the end is arranged offset from the rotation axis. As can be seen from the above, if the waxing tube wants to obtain the performance of the wax cleaning and preventing agent at a higher flow rate, it needs to be set further away from the rotation axis. However, at the edge of the main body away from the rotation axis, bearings and other elements need to be set to form a rotational connection with the connecting part. Due to space limitations, it is difficult to directly install the waxing tube here. The form of the waxing tube in this embodiment can make the waxing tube part as far away from the rotation axis as possible without affecting the installation of the waxing tube.

[0011] As an optional embodiment, the wax-depositing tube is hollowed to form a cavity. The dynamic wax removal and prevention experimental device also includes a circulating water bath, which is connected to the cavity via the main body. The circulating water bath flows cold water into the wax-depositing tube to cool it down, promoting wax deposition on the surface of the wax-depositing tube. The performance of the wax removal and prevention agent is determined by weighing the deposited wax.

[0012] As an optional embodiment, an annular groove is provided on the outer wall of one end of the wax-forming tube, facing away from the main body, and is arranged circumferentially along the wax-forming tube. The annular groove is used to suspend wax balls. After the wax removal and prevention agent is added to the container, it will dissolve the wax balls at a certain rate. By weighing the remaining mass of the wax balls, the wax removal ability of the wax removal and prevention agent can be determined. The annular groove can fix the wax balls, making it easy to remove and weigh them, thereby improving the convenience of the experiment.

[0013] As an optional embodiment, the dynamic wax removal and prevention experimental device further includes a thermometer, one end of which is connected to the main body and the other end extends into the container. The thermometer is provided to help the operator control the experimental temperature.

[0014] As an optional embodiment, the dynamic wax removal and prevention experimental device further includes a compressed air source, which is connected to the interior of the container through the main body. The compressed air source is provided to help the operator control the experimental pressure.

[0015] As an optional embodiment, the dynamic wax removal and prevention experimental device further includes a heat preservation vessel, which is sleeved outside the container and connected to the container, and the driving member is connected to the heat preservation vessel. The heat preservation vessel is provided to maintain a stable temperature in the container.

[0016] As an optional embodiment, the rotating assembly includes a rotating tray and a drive member. The axis of the rotating tray serves as the rotation axis, and the container is mounted on the rotating tray. The drive member is used to drive the rotating tray to rotate about the rotation axis. Using the rotating tray to drive the container rotation rather than a fixed connection such as an axis connection provides greater flexibility and facilitates experimental operation.

[0017] As an optional embodiment, the dynamic wax cleaning and prevention experimental device also includes a frame, which includes a bracket and a mounting plate. The rotating tray is provided on one side of the mounting plate and is connected to the bracket. The driving member is provided on the other side of the mounting plate. The mounting plate is provided with a transmission shaft hole corresponding to the rotation axis. The driving member and the rotating tray are connected through the transmission shaft hole. The end of the bracket facing away from the mounting plate is connected to the main body. The bracket is connected to the main body, which can fix the main body instead of rotating with the container, thereby protecting the various components and pipelines connected to the main body.

[0018] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0019] The utility model provides a dynamic wax cleaning and prevention experimental device, which arranges a container on a rotating component so that the container and the wax cleaning and prevention agent therein can rotate around the rotation axis, and the connecting part connected to the container in the container cover follows the rotation, while the main body rotatably connected to the connecting part and the wax binding tube installed on the main body are stationary, so that the wax cleaning and prevention agent and the wax binding tube produce relative movement, simulating the flow state of the wax cleaning and prevention agent in the wellbore in production practice, making the experimental state of the wax cleaning and prevention agent consistent with the actual use state, and achieving the purpose of improving the accuracy of the indoor experimental evaluation results of the wax cleaning and prevention agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation of the embodiments of the present invention;

[0021] Figure 1 This is a schematic diagram of the dynamic wax cleaning and prevention experimental device in the present invention;

[0022] Figure 2 for Figure 1 Schematic diagram of the middle container, container cover and wax tube.

[0023] Description of Reference Numerals

[0024] Rotating assembly-1; rotating tray-11; driving member-12;

[0025] Container-2;

[0026] Container cover-3; main body-31; thermometer-311; connecting part-32;

[0027] Wax tube-4; root-41; middle section-42; end-43; annular groove-431; cavity-44;

[0028] Circulating water bath-5; water inlet pipe-51; water outlet pipe-52;

[0029] Compressed air source-6; air inlet valve-61; pressure gauge-62; exhaust valve-63;

[0030] Thermal container-7;

[0031] Frame-8; Mounting plate-81; Drive shaft hole-811; Bracket-82;

[0032] Rotation axis -9. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate positions or locations based on those shown in the accompanying drawings. These terms are intended primarily to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to specific positions, or to their construction or operation in a specific orientation.

[0035] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0036] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; they can refer to direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0037] Example 1:

[0038] See also Figure 1 and Figure 2 The utility model provides a dynamic wax cleaning and prevention experimental device, comprising: a wax deposition tube 4, a rotating assembly 1, a container 2 and a container cover 3. The rotating assembly 1 rotates around the rotation axis 9. The container 2 is installed on the rotating assembly 1. The container cover 3 is used to seal the container 2, and the container cover 3 includes a main body 31 and a connecting part 32. The main body 31 is coaxially arranged with the rotation axis 9. The wax deposition tube 4 is connected to the main body 31 and at least partially extends into the container 2; the connecting part 32 is used to be sealed and connected to the container 2, and the connecting part 32 is rotatably connected to the main body 31. In practice, the wax cleaning and prevention agent to be tested is set in the container 2, and the rotating assembly 1 drives the container 2 and the connecting part 32 to rotate, thereby driving the wax cleaning and prevention agent in the container 2 to rotate. Due to the rotational connection between the main body 31 and the connecting part 32, the main body 31 and the wax deposition tube 4 thereon have a certain speed relative to the wax cleaning and prevention agent, thereby providing conditions for dynamic experiments on the wax cleaning and prevention agent. In addition, by adjusting the degree to which the wax tube 4 deviates from the rotation axis 9, the state of the wax cleaning and preventive agent when it impacts the wax tube 4 can also be changed. For example, when the wax tube 4 is set along the rotation axis 9, the wax cleaning and preventive agent flows around the wax tube 4 in the circumferential direction; and when the wax tube 4 deviates from the rotation axis 9, especially when the degree of deviation is large, the wax cleaning and preventive agent impacts the wax tube 4 radially along the wax tube 4. It can be seen that the dynamic wax cleaning and preventive experimental device of this embodiment can simulate various flow states of the wax cleaning and preventive agent, thereby more comprehensively and accurately evaluating the performance of the wax cleaning and preventive agent.

[0039] Preferably, a bearing is provided between the main body portion 31 and the connecting portion 32 .

[0040] Preferably, the material of container 2 and container cover 3 is stainless steel. In addition, container 2 can also use organic glass, so that the operator can observe the internal situation of container 2.

[0041] Preferably, the connection between the container 2 and the connection portion 32 in the container cover 3 is threaded. It should be noted that the steering principle of the rotating assembly is to promote a close fit between the container 2 and the container cover 3 during the rotation of the container 2. Figure 2 Taking the perspective as an example, when the thread uses a left-hand thread, the rotating component 1 should rotate clockwise.

[0042] Example 2:

[0043] A dynamic wax removal and prevention experimental device is provided. Based on Example 1, the wax deposition tube 4 is at least partially offset from the rotation axis 9. As can be seen from the foregoing, the velocity of the wax removal and prevention agent decreases from the edge of the container 2 toward the rotation axis 9. The eccentric placement of the wax deposition tube 4 facilitates obtaining experimental data at higher wax removal and prevention agent flow rates.

[0044] Optionally, the waxing tube 4 includes a root portion 41, a middle portion 42 and a terminal end 43 connected in sequence, the root portion 41 is connected to the main body 31, the root portion 41 is coaxially arranged with the rotation axis 9, and the terminal end 43 is arranged offset from the rotation axis 9. As can be seen from the above, in order to obtain the performance of clearing and preventing wax agents at higher flow rates, the waxing tube 4 needs to be set further away from the rotation axis 9. However, at the edge of the main body 31 away from the rotation axis 9, bearings and other elements need to be provided to form a rotational connection with the connecting portion 32. Due to space limitations, it is difficult to directly install the waxing tube 4 there. However, the form of the waxing tube 4 in this embodiment can make the waxing tube 4 part as far away from the rotation axis 9 as possible without affecting the installation of the waxing tube 4.

[0045] Optionally, the wax forming tube 4 is hollow and forms a cavity 44. The dynamic wax cleaning and prevention experimental device also includes a circulating water bath 5, which is connected to the cavity 44 through the main body 31. The circulating water bath 5 introduces cold water into the wax forming tube 4 to cool it down, promotes waxing on the surface of the wax forming tube 4, and judges the performance of the wax cleaning and prevention agent by weighing the weight of the wax. Exemplarily, the circulating water bath 5 is connected to the cavity 44 through an inlet pipe 51 and an outlet pipe 52. The inlet pipe 51 extends along the extension direction of the wax forming tube 4 to the end of the cavity 44 away from the main body 31, and the outlet pipe 52 is connected to the connection between the cavity 44 and the main body 31. Such a setting is conducive to the air in the cavity 44 and the water that has absorbed more heat to be discharged from the outlet pipe 52.

[0046] Optionally, an annular groove 431 is provided at one end of the wax forming tube 4 away from the main body 31. The annular groove 431 is arranged along the circumference of the wax forming tube 4. The annular groove 431 is used to suspend wax balls. After the wax removing and preventing agent is added to the container 2, it will dissolve the wax balls at a certain rate. By weighing the remaining mass of the wax balls, the wax removing ability of the wax removing and preventing agent can be judged. The annular groove 431 can fix the wax balls, making it easy to remove and weigh the wax balls, which is conducive to improving the convenience of the experiment.

[0047] Optionally, the dynamic wax removal and prevention experimental device further comprises a thermometer 311, one end of the thermometer 311 is connected to the main body 31, and the other end extends into the container 2. The thermometer 311 is provided to help the operator control the experimental temperature.

[0048] Optionally, the dynamic wax cleaning and prevention experimental device also includes a compressed air source 6, which is connected to the interior of the container 2 through the main body 31; optionally, the compressed air source 6 is connected to the interior of the container 2 through an air inlet provided on the main body 31. The compressed air source 6 is provided to help the operator control the experimental pressure. In addition, the pipeline system connecting the compressed air source 6 and the main body 31 should include an air inlet valve 61, a pressure gauge 62, and an exhaust valve 63 for unloading pressure. For example, the compressed air source 6 can be an air compressor, a nitrogen cylinder, etc., which is not limited in this embodiment.

[0049] Preferably, a sealing element or sealing structure should be provided between the main body 31 and the connecting portion 32 to prevent gas from escaping from the gap between the main body 31 and the connecting portion 32 and causing the container 2 to be unable to reach or maintain the desired pressure.

[0050] Optionally, the dynamic wax cleaning and prevention experimental device further comprises a heat preservation vessel 7, which is sleeved on the outside of the container 2 and connected to the container 2, and the driving member 12 is connected to the heat preservation vessel 7. The heat preservation vessel 7 is provided to keep the temperature in the container 2 stable.

[0051] Optionally, the rotating assembly 1 includes a rotating tray 11 and a driving member 12. The axis of the rotating tray 11 serves as the rotating axis 9, and the container 2 is mounted on the rotating tray 11. The driving member 12 is used to drive the rotating tray 11 to rotate about the rotating axis 9. Using the rotating tray 11 rather than a fixed connection such as an axial connection to drive the container 2 to rotate provides greater flexibility and facilitates experimental operation. The driving member 12 can be an asynchronous motor or a servo motor, etc. In practice, the speed gear requirements of the rotating tray 11 should be considered, and this is not limited in this embodiment.

[0052] Optionally, the dynamic wax cleaning and prevention experimental device further includes a frame 8, which includes a bracket 82 and a mounting plate 81. A rotating tray 11 is provided on one side of the mounting plate 81 and is connected to the bracket 82. A driving member 12 is provided on the other side of the mounting plate 81. A transmission shaft hole 811 is provided on the mounting plate 81 corresponding to the rotation axis 9. The driving member 12 is connected to the rotating tray 11 through the transmission shaft hole 811. The end of the bracket 82 facing away from the mounting plate 81 is connected to the main body 31. The bracket 82 is connected to the main body 31, and can fix the main body 31 instead of rotating with the container 2, thereby protecting the various components and pipelines connected to the main body 31.

[0053] The following describes in detail the operation process of the dynamic wax removal and anti-wax experiment of the dynamic wax removal and anti-wax experimental device of the present application:

[0054] It should be noted that for ease of understanding, the following content numbers and lists the operating procedures of the dynamic wax removal and anti-wax experimental device. However, the following steps do not mean that the dynamic wax removal and anti-wax experimental device of this application must be used in a strict order. In practice, the following steps can be configured, combined, or split according to actual needs.

[0055] Dynamic wax removal experiment:

[0056] S1: Place a weighed wax ball in the container 2 and tie it to the annular groove 431 using the string attached to the wax ball.

[0057] S2: Add enough wax remover and wax preventer to submerge the wax balls into the container 2. The wax remover and wax preventer are pre-adjusted to the experimental temperature. Install the container cover 3 and connect the compressed air source 6.

[0058] S3: Start the compressed air source 6 to increase the pressure in the container 2 so that the pressure is higher than the saturated vapor pressure of the paraffin removal and prevention agent under the experimental temperature conditions;

[0059] S4: Start the rotating assembly 1 to rotate the container 2 for a predetermined time;

[0060] S5: After the pressure in container 2 is released, the wax ball is taken out;

[0061] S6: After the wax balls are naturally dried, they are weighed and the wax dissolving rate of the wax remover and wax inhibitor is calculated based on the mass loss of the wax balls before and after the experiment.

[0062] Dynamic anti-wax experiment:

[0063] The mass of the wax tube 4 itself is known:

[0064] S1: Add waxy crude oil and paraffin remover and paraffin preventer in proportion to container 2. The waxy crude oil and paraffin remover and paraffin preventer are adjusted to the experimental temperature in advance. Install the container cover 3 and connect the compressed air source 6.

[0065] S2: Start the compressed air source 6 to increase the pressure of the container 2 so that the pressure is higher than the saturated vapor pressure of the paraffin removal and prevention agent at the test temperature;

[0066] S3: The circulating water bath 5 passes cooling water into the cavity 44 to reduce the temperature of the waxing tube 4;

[0067] S4: Start the rotating component 1 to make the container 2 start to rotate for a predetermined time;

[0068] S5: Container 2 is depressurized and wax tube 4 is removed;

[0069] S6: After the wax-coated tube 4 is naturally dried, its mass is weighed, and the difference between the mass and the mass of the wax-coated tube 4 itself is calculated to obtain the wax deposition amount.

[0070] It can be seen that the dynamic wax removal and wax prevention experimental device of the present invention can complete wax removal measurement and wax deposition measurement, which is beneficial to saving experimental time and space, improving experimental efficiency, and can quickly complete oil product detection and wax removal and prevention agent testing at the engineering site.

[0071] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0072] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A dynamic wax removal and prevention experimental device, comprising a wax tube, characterized in that: Also includes: a rotating assembly, the rotating assembly rotating about a rotation axis; a container, the container being mounted on the rotating assembly; The container cover is used to seal the container, and the container cover includes a main body and a connecting part. The main body is coaxially arranged with the rotation axis, and the wax tube is connected to the main body and at least partially extends into the container; the connecting part is used to be sealed and connected to the container, and the connecting part is rotatably connected to the main body.

2. A dynamic wax removal and prevention experimental device according to claim 1, characterized in that: The wax-binding tube is at least partially disposed away from the rotation axis.

3. A dynamic wax removal and prevention experimental device according to claim 2, characterized in that: The wax-binding tube includes a root portion, a middle portion, and a terminal portion that are connected in sequence. The root portion is connected to the main body portion, the root portion is coaxially arranged with the rotation axis, and the terminal portion is arranged offset from the rotation axis.

4. A dynamic wax removal and prevention experimental device according to claim 2, characterized in that: The wax-binding tube is hollow to form a cavity; The dynamic wax cleaning and prevention experimental device further comprises a circulating water bath, which is connected to the cavity through the main body.

5. A dynamic wax removal and prevention experimental device according to claim 2, characterized in that: An annular groove is provided on the outer wall of one end of the wax-binding tube away from the main body, and the annular groove is arranged along the circumference of the wax-binding tube.

6. A dynamic wax removal and prevention experimental device according to claim 2, characterized in that: The dynamic wax removal and prevention experimental device further comprises a thermometer, one end of which is connected to the main body and the other end of which extends into the container.

7. A dynamic wax removal and prevention experimental device according to claim 1, characterized in that: The dynamic wax cleaning and prevention experimental device further includes a compressed air source, which is connected to the interior of the container through the main body.

8. A dynamic wax removal and prevention experimental device according to claim 1, characterized in that: The dynamic wax cleaning and prevention experimental device further comprises a heat-insulating vessel, which is sleeved on the outside of the container and connected to the container, and the rotating assembly is connected to the heat-insulating vessel.

9. A dynamic wax removal and prevention experimental device according to any one of claims 1 to 8, characterized in that: The rotating assembly includes a rotating tray and a driving member. The axis of the rotating tray serves as the rotating axis, and the container is mounted on the rotating tray. The driving member is used to drive the rotating tray to rotate around the rotating axis.

10. A dynamic wax removal and prevention experimental device according to claim 9, characterized in that: The dynamic wax cleaning and prevention experimental device also includes a frame, which includes a bracket and a mounting plate. The rotating tray is provided on one side of the mounting plate and is connected to the bracket. The driving member is provided on the other side of the mounting plate. A transmission shaft hole is provided on the mounting plate corresponding to the rotation axis, and the driving member is connected to the rotating tray through the transmission shaft hole; the end of the bracket facing away from the mounting plate is connected to the main body.

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