Indoor experiment evaluation device for shale oil well dynamic wax precipitation

Abstract

The utility model discloses an indoor experiment evaluation device for shale oil well dynamic wax precipitation, and belongs to the technical field of oil and gas exploitation. Comprising an injection unit which is connected with a mixing unit and is used for conveying experimental fluid to the mixing unit; the mixing unit is connected with the pipeline simulation unit and is used for mixing experimental fluid and inputting the mixed experimental fluid into the pipeline simulation unit; the pipeline simulation unit is connected with the pressure control unit and is used for simulating a fluid flowing environment in a shaft; the temperature control unit is arranged below the pipeline simulation unit, is connected with the data processing unit and is used for adjusting the temperature of the pipeline simulation unit; the monitoring unit is connected with the pipeline simulation unit and the data processing unit and is used for monitoring the temperature, pressure and wax precipitation state in the pipeline simulation unit; the data processing unit is connected with the temperature control unit and the monitoring unit and used for collecting and processing experimental data. The device simulates the temperature, pressure and fluid flowing state of a complex environment in a shaft, and dynamically researches the paraffin precipitation behavior and rule of an oil well.

Description

Technical Field

[0001] This utility model relates to an experimental evaluation device, and more particularly to an indoor experimental evaluation device for dynamic wax precipitation in shale oil wells, belonging to the technical field of oilfield experimental evaluation devices. Background Technology

[0002] During shale oil well production, dynamic changes in temperature and pressure within the wellbore, as well as fluid flow patterns, can lead to the precipitation and deposition of wax components in the crude oil, severely impacting production efficiency and increasing maintenance costs. Therefore, dynamic wax precipitation in crude oil is a significant engineering problem, and research into its mechanisms and influencing factors is crucial for optimizing oil well production and reducing maintenance costs. Crude oil wax precipitation is influenced by the following factors:

[0003] 1. Temperature Influence: When the temperature of crude oil drops below its wax precipitation point, wax begins to precipitate from the crude oil in a crystallizing form. As the temperature further decreases, the wax crystals gradually aggregate and grow, forming wax crystals that deposit on the surfaces of pipes and equipment. Furthermore, the wax precipitation characteristics of crude oil depend on its own temperature and the temperature difference between the crude oil and the pipe wall. When the crude oil is at its peak wax precipitation temperature, the wax deposition rate is relatively high.

[0004] 2. Pressure effect: Pressure changes also have a significant impact on wax precipitation. As pressure decreases, dissolved gases in crude oil will precipitate out, further affecting the formation and deposition of wax crystals.

[0005] 3. Fluid flow characteristics: The flow rate and flow regime of crude oil have a significant impact on the wax deposition process. Under laminar flow conditions, the amount of wax deposited is relatively large, while under turbulent flow conditions, the shearing effect is enhanced, and the wax deposition rate will decrease due to shear stripping.

[0006] 4. The Influence of Crude Oil Composition: The gums and asphaltenes in crude oil significantly affect the formation and deposition of wax crystals. As natural surfactants, gums and asphaltenes can act as nuclei for paraffin crystallization, influencing the size and aggregation morphology of the wax crystals. Furthermore, the higher the relative molecular mass of the wax in the crude oil, the more complex its structure, and the easier it is to form a wax crystal network structure.

[0007] 5. Influence of pipe wall properties: The roughness and material of the pipe wall also affect wax deposition. Rougher pipe walls provide more crystallization nuclei, leading to more wax deposition.

[0008] Wax deposition can clog pipes and equipment, increase fluid flow resistance, and reduce oil well productivity. For example, in the Bohai Oilfield, wax deposition has led to low well productivity and reduced electric pump efficiency, severely impacting oilfield development efficiency. Frequent wax removal operations increase maintenance costs and operation time. In-depth research into the wax precipitation mechanism can optimize the wax removal cycle and reduce maintenance costs. Accurate understanding of the wax precipitation mechanism helps develop more effective wax prevention technologies, such as chemical wax inhibitors, hot washing techniques, and mechanical wax removal. Wax deposition not only affects production efficiency but also damages wellbore structures, shortening the lifespan of oil wells. Optimizing wax prevention measures can reduce the use of chemical agents, lower environmental impact, and improve the economic efficiency of oil wells.

[0009] Currently, most existing wax precipitation experimental devices rely on static methods, which are insufficient to simulate the complex dynamic environment within wellbores. Specifically, they suffer from the following problems: 1. Insufficient dynamic environment simulation capabilities: They cannot reproduce temperature gradients, pressure gradients, and fluid flow states within the wellbore, leading to discrepancies between wax precipitation behavior research and actual operating conditions. 2. Lack of multi-physics coupling monitoring capabilities: They cannot perform real-time coordinated monitoring of temperature, pressure, fluid flow, and wax deposition processes, making it difficult to analyze the impact of multiple factors on wax precipitation. 3. Limitations in data acquisition and analysis: Static experiments often rely on post-experimental weighing or simple observations, failing to dynamically record the formation, migration, and deposition processes of wax crystals. Furthermore, the low accuracy of data acquisition results in a lack of reliable experimental data for the development of anti-wax technology. 4. Limited applicability: They are unable to simulate the wax precipitation behavior of multiphase fluids and cannot meet the research needs of conditions such as fracturing and flowback in shale oil wells.

[0010] Chinese invention patent application CN 112710575A discloses a simple evaluation device and method for evaluating the wax prevention rate of on-site wax-removing and anti-wax agents. This device involves pouring oil samples into multiple beakers, adding different types of wax-removing and anti-wax agents, stirring, and cooling. The effectiveness of the wax-removing and anti-wax agents is evaluated by observing the quality of wax deposition on the stirring blades. Its shortcomings are: 1. It mainly evaluates the effectiveness of wax-removing and anti-wax agents, and the experimental environment is relatively simple, simulating wax precipitation conditions only with beakers and a cooling box. It cannot dynamically simulate the complex environment inside the wellbore, including temperature gradients, pressure gradients, and fluid flow states, resulting in significant differences from actual working conditions. 2. This experimental device evaluates the wax prevention effect based on the quality of wax deposition on the stirring blades, leading to relatively limited data acquisition. 3. This device is mainly used to evaluate the effectiveness of wax-removing and anti-wax agents, resulting in a relatively narrow scope of application. 4. The experimental process is mainly a static experiment and cannot simulate the wax precipitation behavior of fluids under dynamic conditions.

[0011] In conclusion, in-depth research into the mechanism of dynamic wax precipitation in crude oil is of great significance for optimizing oil well production, reducing maintenance costs, and extending oil well life. Utility Model Content

[0012] Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, but such simplifications or omissions shall not be used to limit the scope of this utility model.

[0013] The purpose of this invention is to overcome the shortcomings of existing mechanical and chemical descaling methods and provide a laboratory experimental evaluation device for dynamic wax deposition in shale oil wells. This device can better understand the wax deposition mechanism and evaluate the effectiveness of anti-wax measures, and can dynamically simulate the wellbore environment.

[0014] To address the above technical problems, this utility model provides a laboratory experimental evaluation device for dynamic wax precipitation in shale oil wells, comprising an injection unit, a mixing unit, a pipeline simulation unit, a temperature control unit, a pressure control unit, a monitoring unit, and a data processing unit. The device is characterized in that: the injection unit is connected to the mixing unit and is used to deliver experimental fluid to the mixing unit; the mixing unit is connected to the pipeline simulation unit and is used to mix the experimental fluid before inputting it into the pipeline simulation unit; the pipeline simulation unit is connected to the pressure control unit and is used to simulate the fluid flow environment within the wellbore; the temperature control unit is located below the pipeline simulation unit and connected to the data processing unit, and is used to adjust the temperature of the pipeline simulation unit; the monitoring unit is connected to the pipeline simulation unit and the data processing unit, and is used to monitor the temperature, pressure, and wax precipitation status within the pipeline simulation unit; the data processing unit is connected to the temperature control unit and the monitoring unit, and is used to collect and process experimental data.

[0015] Furthermore, the injection unit includes a high-pressure injection pump, and the mixing unit includes a high-pressure mixer. The outlet of the high-pressure injection pump is connected to the inlet of the high-pressure mixer via a pipe for injecting experimental fluid into the high-pressure mixer.

[0016] Furthermore, the pipeline simulation unit includes an experimental pipeline simulation device. The inlet end of the experimental pipeline simulation device is connected to the mixing unit, and the outlet end is connected to the pressure control unit. The experimental pipeline simulation device is equipped with a pressure sensor and a thermocouple for monitoring the pressure and temperature inside the pipeline.

[0017] Furthermore, the experimental pipeline simulation device adopts a transparent high-pressure heat-resistant shell, with mounting holes on the inner wall for installing pressure sensors and thermocouples, and a heat-conducting contact surface on the outer wall for connecting with the segmented heating system.

[0018] Furthermore, the temperature control unit includes a segmented heating system, which is located at the bottom of the experimental pipeline simulation device and electrically connected to the data processing unit. The segmented heating system includes several heating modules distributed along the axial direction of the pipeline simulation unit, used for segmented temperature control of the experimental pipeline simulation device.

[0019] Furthermore, the pressure control unit includes a back pressure valve, a collection bottle, and a hand-cranked pressure pump. The back pressure valve is connected to the pipeline simulation unit, the collection bottle, and the hand-cranked pressure pump via pipes, and is used to control the pressure within the pipeline simulation unit and collect experimental fluid.

[0020] Furthermore, the monitoring unit includes a temperature monitoring system, a pressure monitoring system, and a wax precipitation monitoring system. The temperature monitoring system and the pressure monitoring system are installed inside the pipeline simulation unit, and the wax precipitation monitoring system is fixed above the pipeline simulation unit by a bracket. The temperature monitoring system, the pressure monitoring system, and the wax precipitation monitoring system are all electrically connected to the data processing unit.

[0021] Furthermore, the temperature monitoring system includes a thermocouple, and the pressure monitoring system includes a pressure sensor. Both the thermocouple and the pressure sensor are installed on the inner wall of the experimental pipeline simulation device and electrically connected to the data processing unit for real-time acquisition of temperature and pressure data.

[0022] Furthermore, the wax precipitation monitoring system includes an optical microscope and a high-definition camera. The optical microscope and the high-definition camera are aligned with the observation window of the experimental pipeline simulation device. The optical microscope and the high-definition camera are electrically connected to the data processing unit for real-time monitoring of the wax crystal formation and deposition process.

[0023] Furthermore, the data processing unit includes a data acquisition and control system, which integrates a real-time acquisition module for temperature, pressure, and wax precipitation data, and a visualization software module. The data acquisition and control system is electrically connected to the temperature control unit and the monitoring unit, respectively, to realize the real-time display and analysis of experimental parameters.

[0024] Compared with existing technologies, this invention achieves the following beneficial effects: 1. Through multi-unit collaboration, this device can accurately simulate the gradient change of wellbore temperature from high reservoir temperature to low wellbore temperature in the laboratory, thus realistically reflecting the wax precipitation behavior caused by fluid temperature drop. It can simulate the process of gradually decreasing wellbore pressure from formation pressure to wellhead pressure through a controllable high-pressure system, thereby studying the impact of pressure changes on wax precipitation. It can simulate the dynamic flow characteristics of fluids within the wellbore through adjustable flow rates and flow patterns such as laminar and turbulent flow, and study the influence of flow conditions on wax crystal formation, migration, and deposition, more closely resembling actual working conditions and realistically reproducing the dynamic wax precipitation process, providing a scientific basis for optimizing oil well production processes and implementing wax prevention measures.

[0025] 2. This device, through real-time monitoring and control of parameters such as temperature, pressure, flow rate, and wax deposition thickness, ensures the accuracy and reliability of experimental data, enhances the scientific nature and guiding significance of experimental results, and lays a data foundation for subsequent analysis and application. Real-time monitoring and precise control of multiple parameters such as temperature, pressure, flow rate, and wax deposition thickness enable a more comprehensive study of wax deposition behavior, providing stronger support for oil well production optimization and wax prevention technology development.

[0026] 3. The wax precipitation monitoring system of this device integrates an optical microscope and a camera system, which can directly observe the wax crystal formation and deposition process, facilitate the analysis of wax precipitation rules, provide an intuitive and visual means for in-depth research on the wax precipitation mechanism, and make up for the shortcomings of traditional devices in observing dynamic processes.

[0027] 4. Not only is it applicable to wax precipitation studies of various fluids such as crude oil, fracturing fluid, and multiphase fluids, supporting the simulation of the effects of different fluids and their interactions on wax deposition; it can also be used to simulate the effects of mixing, cooling, and pressure changes during fracturing fluid flowback on wax precipitation, providing experimental support for the development and optimization of chemical wax inhibitors, hot washing techniques, and mechanical wax removal technologies. Furthermore, it can simulate wax precipitation behavior under different wellbore conditions, providing more comprehensive support for oil well production process optimization and wax prevention technology design, and providing experimental basis for wellbore structure design, thermal control equipment layout, and fracturing fluid flowback process optimization. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0029] Figure 1 This is a schematic diagram of the structure of the indoor experimental evaluation device for dynamic wax precipitation in shale oil wells according to this utility model;

[0030] Figure 2 A cross-sectional view of the experimental pipe provided for an embodiment of this utility model;

[0031] Figure 3 Connection diagram of the data acquisition and control system provided in the embodiments of this utility model;

[0032] In the diagram: 1. High-pressure injection pump; 2. High-pressure mixer; 3. Segmented heating system; 4. Experimental pipeline simulation device; 5. Pressure monitoring system; 6. Temperature monitoring system; 7. Wax precipitation monitoring system; 8. Back pressure valve; 9. Collection bottle; 10. Hand-cranked pressure pump; 11. Data acquisition and control system. Detailed Implementation

[0033] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] Example

[0036] like Figures 1 to 3 As shown, the present invention provides an indoor experimental evaluation device for dynamic wax precipitation in shale oil wells, comprising an injection unit, a mixing unit, a pipeline simulation unit, a temperature control unit, a pressure control unit, a monitoring unit, and a data processing unit. The injection unit is connected to the mixing unit and is used to deliver experimental fluid to the mixing unit. The mixing unit is connected to the pipeline simulation unit and is used to mix the experimental fluid before inputting it into the pipeline simulation unit. The pipeline simulation unit is connected to the pressure control unit and is used to simulate the fluid flow environment inside the wellbore. The temperature control unit is located below the pipeline simulation unit and is connected to the data processing unit, and is used to adjust the temperature of the pipeline simulation unit. The monitoring unit is connected to the pipeline simulation unit and the data processing unit, and is used to monitor the temperature, pressure, and wax precipitation status inside the pipeline simulation unit. The data processing unit is connected to the temperature control unit and the monitoring unit, and is used to collect and process experimental data.

[0037] In the above description, the injection unit includes a high-pressure injection pump 1, and the mixing unit includes a high-pressure mixer 2. The outlet of the high-pressure injection pump 1 is connected to the inlet of the high-pressure mixer 2 via a pipeline for injecting experimental fluid into the high-pressure mixer 2. The pipeline simulation unit includes an experimental pipeline simulation device 4. The outlet of the high-pressure mixer 2 is connected to the inlet of the experimental pipeline simulation device 4, and the outlet of the experimental pipeline simulation device 4 is connected to a pressure control unit. The experimental pipeline simulation device 4 is equipped with a pressure sensor and a thermocouple for monitoring the pressure and temperature within the pipeline.

[0038] Among them, the experimental pipeline simulation device 4 is made of transparent high-pressure heat-resistant material, with mounting holes for installing pressure sensors and thermocouples on the inner wall, and a heat-conducting contact surface for connecting to the segmented heating system 3 on the outer wall.

[0039] The temperature control unit includes a segmented heating system 3, which is located at the bottom of the experimental pipeline simulation device 4 and electrically connected to the data processing unit. The segmented heating system 3 comprises several heating modules distributed axially along the pipeline simulation unit, used for segmented temperature control of the experimental pipeline simulation device 4. The pressure control unit includes a back pressure valve 8, a collection bottle 9, and a hand-cranked pressure pump 10. The back pressure valve 8 is connected to the pipeline simulation unit, the collection bottle 9, and the hand-cranked pressure pump 10 via pipes, used to control the pressure within the pipeline simulation unit and collect experimental fluid. The monitoring unit includes a temperature monitoring system 6, a pressure monitoring system 5, and a wax precipitation monitoring system 7. The temperature monitoring system 6 and pressure monitoring system 5 are located inside the pipeline simulation unit, while the wax precipitation monitoring system 7 is fixed above the pipeline simulation unit by a bracket. All three systems are electrically connected to the data processing unit. The temperature monitoring system 6 includes a thermocouple, and the pressure monitoring system 5 includes a pressure sensor. Both the thermocouple and pressure sensor are installed on the inner wall of the experimental pipeline simulation device 4 and electrically connected to the data processing unit for real-time acquisition of temperature and pressure data. The wax precipitation monitoring system 7 includes an optical microscope and a high-definition camera. The optical microscope and the high-definition camera are aligned with the observation window of the experimental pipeline simulation device 4. The optical microscope and the high-definition camera are electrically connected to the data processing unit for real-time monitoring of the wax crystal formation and deposition process.

[0040] The data processing unit includes a data acquisition and control system 11. This system integrates real-time acquisition modules for temperature, pressure, and wax precipitation data, as well as visualization software modules. The data acquisition and control system 11 is electrically connected to the temperature control unit and the monitoring unit, respectively, to achieve real-time display and analysis of experimental parameters. Specific data processing includes:

[0041] The amount of wax deposited is calculated based on either the gravimetric method or the thickness measurement method. The formula for calculating the amount of wax deposited using the gravimetric method is as follows:

[0042] Δm=m 初始 -m 最终 (1)

[0043] In the formula, Δm is the mass of wax deposition, in grams; m 初始 The initial mass of the inner wall of the pipe before the experiment is expressed in grams (g); m 最终 This represents the total mass of the pipe's inner wall after the experiment, expressed in grams.

[0044] The formula for calculating the wax deposition amount using the thickness measurement method is:

[0045]

[0046] m 蜡 =ρ 蜡 ·A·Δh (3)

[0047] In the formula, Δh is the average wax deposition thickness, in mm; h i The thickness of the wax layer measured at the i-th measurement is in mm; n is the number of measurement points; m 蜡 The mass of the wax deposition is expressed in grams (g); ρ 蜡 The density of wax is generally 0.85–0.95 g / cm³. 3 A represents the deposition area on the inner wall of the pipe, in cm².

[0048] Additionally, if it is necessary to analyze the wax deposition rate per unit time, it needs to be calculated in conjunction with the experimental duration:

[0049]

[0050] Among them, R 蜡 t represents the wax deposition rate, in g / cm²·h; t represents the experimental duration, in h.

[0051] The wax deposition thickness on the inner wall of the experimental pipe was measured in real time using a high-definition camera and optical microscope in the wax precipitation monitoring system 7. The average thickness was then calculated according to formula (2), and the wax deposition mass was calculated according to formula (3) by combining the wax density and deposition area. After the experiment, the pipe was disassembled and weighed to verify the consistency of the deposition data.

[0052] In summary, the aforementioned indoor experimental evaluation device for dynamic wax precipitation in shale oil wells operates on the following principle: A high-pressure injection pump 1 injects simulated fluid into the experimental pipeline. As the fluid flows through the pipeline, a temperature gradient is created by a segmented heating system 3, and a pressure gradient is created by a pressure control system, simulating the actual production environment within the wellbore. A wax precipitation monitoring system 7 records the dynamic changes in wax precipitation in real time, and the results are output through a data acquisition and control system 11 for analyzing wax precipitation patterns and influencing factors.

[0053] The specific process is as follows: First, based on the actual temperature distribution of the target oil well, the experimental pipeline of the simulated wellbore is heated or cooled in sections using the segmented heating system 3 to construct a temperature gradient similar to that inside the wellbore. Second, the fluid flow rate is set through the flow control device to make the crude oil from the shale oil well flow in the simulated wellbore, thereby simulating the fluid flow behavior in actual production. Subsequently, the temperature monitoring system 6 and the pressure monitoring system 5 are activated to monitor the changes in various parameters in real time. At the same time, the formation and deposition process of wax crystals are observed in real time at a frame-per-second observation frequency using an optical microscope and a high-definition camera. After the experimental time is met, the experiment is ended according to the operating procedure. First, the crude oil in the pipeline is drained, and then the experimental pipeline simulation device 4 is disassembled to perform wax observation, cleaning, filtration, weighing, and other operations. Finally, the experimental pipeline is cleaned with diesel fuel to complete the entire experimental process.

[0054] Therefore, by adopting the above-mentioned indoor experimental evaluation device for dynamic wax precipitation in shale oil wells, the simulation of the dynamic environment of the shale oil wellbore and the real-time monitoring of the wax precipitation process were realized. This solved the problem that traditional static experiments could not couple multi-physics field effects, enabling dynamic research on the wax precipitation behavior and laws of oil wells, and significantly improving the engineering practicality of wax precipitation research.

[0055] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A device for shale oil well dynamic wax precipitation chamber experiment evaluation, characterized in that, The device comprises an injection unit, a mixing unit, a pipeline simulation unit, a temperature control unit, a pressure control unit, a monitoring unit, and a data processing unit. Its features include: the injection unit being connected to the mixing unit for supplying experimental fluid to the mixing unit; the mixing unit being connected to the pipeline simulation unit for mixing the experimental fluid and then inputting it into the pipeline simulation unit; the pipeline simulation unit being connected to the pressure control unit for simulating the fluid flow environment within a wellbore; the temperature control unit being located below the pipeline simulation unit and connected to the data processing unit for regulating the temperature of the pipeline simulation unit; the monitoring unit being connected to both the pipeline simulation unit and the data processing unit for monitoring the temperature, pressure, and wax precipitation state within the pipeline simulation unit; and the data processing unit being connected to both the temperature control unit and the monitoring unit for collecting and processing experimental data.

2. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 1, characterized in that: The injection unit includes a high-pressure injection pump, and the mixing unit includes a high-pressure mixer. The outlet of the high-pressure injection pump is connected to the inlet of the high-pressure mixer via a pipe for injecting experimental fluid into the high-pressure mixer.

3. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 1, characterized in that: The pipeline simulation unit includes an experimental pipeline simulation device. The inlet end of the experimental pipeline simulation device is connected to the mixing unit, and the outlet end is connected to the pressure control unit. The experimental pipeline simulation device is equipped with a pressure sensor and a thermocouple for monitoring the pressure and temperature inside the pipeline.

4. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 3, characterized in that: The experimental pipeline simulation device adopts a transparent high-pressure heat-resistant shell, with mounting holes on the inner wall for installing pressure sensors and thermocouples, and a heat-conducting contact surface on the outer wall for connecting with the segmented heating system.

5. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 1, characterized in that: The temperature control unit includes a segmented heating system, which is located at the bottom of the experimental pipeline simulation device and electrically connected to the data processing unit. The segmented heating system includes several heating modules distributed along the axial direction of the pipeline simulation unit, used for segmented temperature control of the experimental pipeline simulation device.

6. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 1, characterized in that: The pressure control unit includes a back pressure valve, a collection bottle, and a hand-cranked pressure pump. The back pressure valve is connected to the pipeline simulation unit, the collection bottle, and the hand-cranked pressure pump via pipes, and is used to control the pressure in the pipeline simulation unit and collect experimental fluid.

7. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 1, characterized in that: The monitoring unit includes a temperature monitoring system, a pressure monitoring system, and a wax precipitation monitoring system. The temperature monitoring system and the pressure monitoring system are located inside the pipeline simulation unit, and the wax precipitation monitoring system is fixed above the pipeline simulation unit by a bracket. The temperature monitoring system, the pressure monitoring system, and the wax precipitation monitoring system are all electrically connected to the data processing unit.

8. The indoor experimental evaluation device for dynamic wax precipitation in shale oil wells according to claim 7, characterized in that: The temperature monitoring system includes a thermocouple, and the pressure monitoring system includes a pressure sensor. Both the thermocouple and the pressure sensor are installed on the inner wall of the experimental pipeline simulation device and electrically connected to the data processing unit for real-time acquisition of temperature and pressure data.

9. The apparatus for shale oil well dynamic wax precipitation chamber experiment evaluation according to claim 7, characterized in that: The wax precipitation monitoring system includes an optical microscope and a high-definition camera. The optical microscope and the high-definition camera are aligned with the observation window of the experimental pipeline simulation device. The optical microscope and the high-definition camera are electrically connected to the data processing unit for real-time monitoring of the wax crystal formation and deposition process.

10. The device for shale oil well dynamic wax precipitation chamber experiment evaluation according to any one of claims 1 to 9, characterized in that: The data processing unit comprises a data acquisition and control system, wherein the data acquisition and control system is integrated with a real-time acquisition module of temperature, pressure and wax precipitation data and a visualization software module; the data acquisition and control system is electrically connected with the temperature control unit and the monitoring unit respectively, so as to realize real-time display and analysis of experimental parameters.

Images