Chemical flooding oilfield injection and production well plugging simulation and evaluation experimental device

Abstract

The utility model belongs to oilfield injection and production well plugging experiment technical field discloses a kind of chemical flooding oilfield injection and production well plugging simulation and plugging evaluation experimental device. Including: experimental wellbore, the lower part of experimental wellbore is integrally provided with support net disc, quartz sand layer and plugging layer are filled in experimental wellbore inside from support net disc upwards in sequence, and the lower part area of experimental wellbore located support net disc is equipped with water outlet pipe;Water outlet pipe and water injection control pipe are equipped in the upper part of plugging layer of experimental wellbore, and the top of experimental wellbore is detachably installed with compaction cover, and compaction cover includes the sealing cover for sealing the opening of the top of experimental wellbore, the working electric cylinder connected with sealing cover, and the detection disc for pressing plugging layer, and the output shaft of working electric cylinder passes through sealing cover and is detachably connected with detection disc. The chemical flooding oilfield injection and production well plugging simulation and plugging evaluation experimental device of the utility model realizes the compaction treatment to plugging material, and improves the authenticity of plugging model.

Description

Technical Field

[0001] This utility model relates to the field of experimental technology for unblocking injection and production wells in chemical flooding oilfields, specifically to an experimental device for simulating and evaluating the unblocking of injection and production wells in chemical flooding oilfields. Background Technology

[0002] In the development of chemical flooding oilfields, the problem of well blockage in injection and production wells has always been a key factor affecting oilfield production efficiency and economic benefits. In order to study effective unblocking methods and materials, an experimental device for simulating and evaluating well blockage in chemical flooding oilfields has been developed.

[0003] However, existing experimental setups have some shortcomings. Firstly, the plugging material is often loose and not compacted enough, leading to significant differences between the plugging model and actual well blockage conditions. This affects the accuracy and reliability of the experimental results, making it difficult to accurately reflect the performance of the unblocking material in practical applications. Secondly, during water injection experiments, existing setups are typically inconvenient for precise control and monitoring of the water injection rate and volume. This makes it difficult for researchers to accurately assess the unblocking effect and the applicability of the unblocking material under different water injection conditions, thus reducing the precision and practicality of the experiments.

[0004] Therefore, developing an experimental device for simulating and evaluating blockage in chemical flooding wells has become an urgent technical problem in this field. This device can effectively solve the above problems, achieve compaction of the blockage material, improve the realism of the blockage model, and conveniently control and detect the injection flow rate and volume. It is of great significance for improving the accuracy and effectiveness of blockage simulation and evaluation in chemical flooding wells. Utility Model Content

[0005] In order to achieve compaction of the plugging material and improve the realism of the plugging model, this utility model proposes an experimental device for simulating and evaluating plugging in injection and production wells in chemical flooding oilfields.

[0006] The experimental device for simulating and evaluating blockage in chemical flooding wells of this invention includes: an experimental wellbore; a supporting mesh is integrally installed in the lower part of the experimental wellbore; the interior of the experimental wellbore is filled with a quartz sand layer and a blockage layer sequentially from the supporting mesh upwards; a water outlet pipe is provided in the lower part of the experimental wellbore located on the supporting mesh; a drain valve and a water injection control pipe are provided in the upper part of the experimental wellbore located on the blockage layer; a compaction cover is detachably installed on the top of the experimental wellbore; the compaction cover includes a sealing cover for sealing the opening at the top of the experimental wellbore, a working electric cylinder connected to the sealing cover, and a detection disc for pressing against the blockage layer; the output shaft of the working electric cylinder passes through the sealing cover and is detachably connected to the detection disc.

[0007] Furthermore, the detection plate includes a piston plate, the upper end of which forms a connecting post that is detachably connected to the output shaft of the working electric cylinder. A pressure sensor is connected to the connecting post, and a sealing ring is embedded in the outer periphery of the piston plate. The sealing ring is in a sealed sliding connection with the inner wall of the experimental well.

[0008] Furthermore, the pressure sensor is threadedly connected to the connecting post, and the connecting post is threadedly connected to the output shaft.

[0009] Furthermore, the sealing cap includes a sealing cap body for sealing the end of the opening and a threaded ring connected to the lower end of the sealing cap body, the threaded ring being threadedly connected to the inner wall of the experimental well barrel.

[0010] Furthermore, the water injection control pipe includes a working water pump, one end of which is connected to a water injection hose, and the other end is connected to a connecting hose. The connecting hose is connected to a connector for communicating with the experimental well. A flow sensor and a flow velocity sensor are installed inside the connector.

[0011] Furthermore, flow sensors and velocity sensors are connected to both the front and rear sides of the connector.

[0012] Furthermore, the experimental device for simulating and evaluating blockage in injection and production wells of chemical flooding oilfields also includes a control cabinet. The control cabinet is equipped with a central processing unit, which is electrically connected to the working electric cylinder, pressure sensor, working water pump, flow sensor, and velocity sensor.

[0013] Furthermore, the plugging layer is a mixture of hydrolyzed polyacrylamide solution and quartz sand.

[0014] Furthermore, the experimental well casing is made of transparent stainless steel, and the supporting mesh is also made of stainless steel.

[0015] Furthermore, the drain valve is positioned lower than the water injection control pipe.

[0016] Compared with existing technologies, this utility model's experimental device for simulating and evaluating blockage in chemical flooding wells effectively compacts the blockage layer by using a compaction cap, a working electric cylinder, and a detection disc, improving the realism and reliability of the blockage model and making the experimental results closer to the actual blockage situation in oil wells. The inclusion of a water injection control pipe, along with flow and velocity sensors, allows for precise control and monitoring of the flow rate and velocity during water injection, improving the accuracy and repeatability of the experiment. The transparent stainless steel experimental well casing facilitates direct observation of internal changes during the experiment. The central processing unit in the control cabinet enables centralized control and data acquisition and processing of all components, improving the automation level and data management convenience of the experiment. Overall, this utility model's experimental device for simulating and evaluating blockage in chemical flooding wells effectively solves the problems of poor compaction of the blockage layer and insufficient water injection control precision in existing experimental devices, providing a more efficient and accurate experimental method for simulating and evaluating blockage in chemical flooding wells. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the experimental device for simulating and evaluating blockage in chemical flooding wells in oilfields according to an embodiment of the present invention.

[0018] Figure 2 for Figure 1 The diagram shows the structure of the compaction cap;

[0019] Figure 3 for Figure 2 The diagram shows the structure of the detection disc.

[0020] Figure 4 for Figure 1 The diagram shows the structure of the water injection control pipe.

[0021] In the diagram: 100-Experimental device for simulating and evaluating blockage in injection and production wells of chemical flooding oilfields; 1-Experimental wellbore; 2-Support mesh; 3-Quartz sand layer; 4-Blocking layer; 5-Outlet pipe; 6-Drain valve; 7-Injection control pipe; 71-Working water pump; 72-Injection hose; 73-Connecting hose; 74-Connector; 75-Flow sensor and velocity sensor; 8-Compactor cover; 81-Sealing cover body; 82-Threaded ring; 83-Working electric cylinder; 84-Detection disc; 841-Piston plate; 844-Connecting column; 842-Pressure sensor; 843-Sealing ring; 9-Control cabinet; 10-Buttons; 11-Display screen. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "top", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0024] refer to Figures 1 to 4 As shown, the experimental device 100 for simulating and evaluating blockage in chemical flooding wells of this utility model may include an experimental wellbore 1. A support mesh 2 is integrally provided in the lower part of the experimental wellbore 1. Quartz sand layer 3 and blockage layer 4 are sequentially filled from the support mesh 2 upwards inside the experimental wellbore 1. A water outlet pipe 5 is provided in the lower part of the experimental wellbore 1 located on the support mesh 2. A drain valve 6 and a water injection control pipe 7 are provided in the upper part of the experimental wellbore 1 located on the blockage layer 4. A compaction cover 8 is detachably installed on the top of the experimental wellbore 1. The compaction cover 8 includes a sealing cover for sealing the opening at the top of the experimental wellbore 1, a working electric cylinder 83 connected to the sealing cover, and a detection disc 84 for pressing the blockage layer 4. The output shaft of the working electric cylinder 83 passes through the sealing cover and is detachably connected to the detection disc 84.

[0025] The experimental device 100 for simulating and evaluating blockage in chemical flooding wells of this utility model simulates the physical structure of a real oil well by layering quartz sand layer 3 and blockage layer 4, combined with the supporting mesh 2. The water outlet pipe 5 and the drain valve 6 work together to regulate the liquid pressure in the experimental wellbore, the water injection control pipe 7 precisely controls the water injection conditions, the compaction cover 8 provides dynamic compaction function, and the working electric cylinder 83 and the detection disc 84 realize effective compaction of the blockage layer, improving the realism and reliability of the blockage model, making the experimental results closer to the actual blockage situation of the oil well, thereby improving the accuracy, reliability, simulation and operability of the experimental results as a whole.

[0026] In such Figure 2 and Figure 3In the preferred embodiment shown, the detection disk 84 may include a piston plate 841. The upper end of the piston plate 841 has a connecting post 844 detachably connected to the output shaft of the working electric cylinder 83. A pressure sensor 842 is connected to the connecting post 844. A sealing ring 843 is embedded in the outer periphery of the piston plate 841, and the sealing ring 843 is slidably connected to the inner wall of the experimental wellbore 1. In this embodiment, the pressure sensor 842 can monitor the compaction pressure in real time, ensuring that the compaction of the blockage layer is consistent with that of a real oil well; the sealing ring 843 slidably seals against the inner wall of the experimental wellbore 1, preventing liquid leakage, ensuring a stable experimental environment, and improving data reliability; the detachable connection between the connecting post 844 and the output shaft of the working electric cylinder 83 facilitates their installation, disassembly, and maintenance.

[0027] In a preferred embodiment, the pressure sensor 842 is threadedly connected to the connecting post 844, and the connecting post 844 is threadedly connected to the output shaft. This modular threaded connection design facilitates quick disassembly, replacement, or calibration of the pressure sensor 842, reducing maintenance costs while ensuring connection stability and signal transmission accuracy.

[0028] In such Figure 2 In the preferred embodiment shown, the sealing cap may include a sealing cap body 81 for sealing the end of the opening and a threaded ring 82 connected to the lower end of the sealing cap body 81. The threaded ring 82 is threadedly connected to the inner wall of the experimental well barrel 1. The threaded connection simplifies the installation and disassembly process of the sealing cap and the experimental well barrel 1, improving operational convenience; at the same time, the threaded fit enhances the sealing performance, preventing liquid or gas leakage during the experiment.

[0029] In such Figure 4 In the preferred embodiment shown, the water injection control pipe 7 may include a working water pump 71. One end of the working water pump 71 is connected to a water injection hose 72, and the other end is connected to a connecting hose 73. The connecting hose 73 is connected to a connector 74 for communication with the experimental well 1. A flow sensor and a flow velocity sensor 75 are installed inside the connector 74. The flow sensor and the flow velocity sensor 75 can monitor the water injection parameters in real time to ensure that the experimental conditions are accurate and controllable. The working water pump 71 and the connecting hose 73 work together to achieve stable water injection, improving the repeatability of the experiment and the comparability of the results.

[0030] In a preferred embodiment, flow sensors and velocity sensors 75 can be connected to both the front and rear sides of the connector 74. The symmetrical arrangement of the sensors on both sides can counteract the influence of water flow disturbances on unilateral measurements, reduce data deviation, and improve the balance and accuracy of flow and velocity detection.

[0031] In such Figure 1In the preferred embodiment shown, the chemical flooding well blockage simulation and unblocking evaluation experimental device 100 of this utility model may further include a control cabinet 9. The control cabinet 9 may contain a central processing unit (CPU), and may also be equipped with buttons 10 and a display screen 11. The CPU is electrically connected to the electric cylinder 83, pressure sensor 842, water pump 71, flow sensor, and velocity sensor 75. The CPU integrates control of compaction, water injection, and data acquisition processes, achieving fully automated experimental operation; real-time data feedback and display reduce human intervention errors, improving experimental efficiency and intelligence.

[0032] According to this invention, the plugging layer 4 can be a mixture of hydrolyzed polyacrylamide solution and quartz sand. The mixed material simulates the real plugging materials formed during the chemical flooding process in oilfields (such as polymer residues cemented with sand particles), enhancing the chemical simulation of the experiment and making the plugging evaluation closer to actual working conditions.

[0033] In a preferred embodiment, the experimental well shaft 1 can be made of transparent stainless steel, and the supporting mesh disk 2 can also be made of stainless steel. Stainless steel is corrosion-resistant and has high strength, ensuring the long-term stable operation of the experimental device; the transparent well shaft design facilitates direct observation of the internal blockage and unblocking process, enhancing the intuitiveness of the experiment.

[0034] In such Figure 1 In the preferred embodiment shown, the drain valve 6 is positioned lower than the water injection control pipe 7. The low-position drain valve 6 optimizes the water flow distribution within the experimental well, avoiding measurement errors caused by localized pressure buildup, while simultaneously accelerating the discharge of excess liquid and maintaining dynamic equilibrium in the experimental environment.

[0035] The working principle and process of the chemical flooding oilfield injection-production well blockage simulation and unblocking evaluation experimental device 100 according to this utility model embodiment are described in detail below: During the unblocking experiment, firstly, a quartz sand layer 3 is filled on the support mesh 2, then the sealing cover body 81 is rotated and installed, and the working electric cylinder 83 drives the piston plate 841 to descend. Under the pressure detected by the pressure sensor 842, the quartz sand layer 3 is compacted. After compaction, the blockage layer 4 is filled again to complete the establishment of the oilfield injection-production well blockage model. Subsequently, chemical unblocking material is injected into the experimental wellbore 1 for static unblocking. After static unblocking, the water injection hose 72 is placed in water and the working water pump 71 is driven to work with the connecting hose 73 and the connector 74 to inject water into the experimental wellbore 1. At the same time, the flow sensor and velocity sensor 75 inside the connector 74 detect the flow rate and flow data of the injected water and transmit the data to the central processing unit in the control cabinet 9 for processing and display. During the water injection process, the drain valve 6 is opened to release excess water. The effectiveness of the unblocking material is evaluated by observing whether the injected water can penetrate the blockage layer 4 and the quartz sand layer 3.

[0036] In summary, the experimental device 100 for simulating and evaluating blockage in chemical flooding wells in oilfields, provided by this utility model, effectively solves the problems of poor compaction of the blockage layer and insufficient water injection control precision in the prior art through the synergistic effect of its components. It provides a more accurate and reliable experimental means for simulating and evaluating blockage in chemical flooding wells in oilfields, and has significant practical value and prospects for widespread application.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An experimental device for simulating and evaluating blockage in injection-production wells of chemically enhanced oilfields, characterized in that, The device includes: an experimental well casing, wherein a supporting mesh is integrally installed in the lower part of the experimental well casing; the interior of the experimental well casing is filled with a quartz sand layer and a blocking layer sequentially from the supporting mesh onwards; a water outlet pipe is provided in the lower region of the experimental well casing located on the supporting mesh; a drain valve and a water injection control pipe are provided in the upper part of the experimental well casing located on the blocking layer; a compaction cover is detachably installed on the top of the experimental well casing; the compaction cover includes a sealing cover for sealing the opening at the top of the experimental well casing, a working electric cylinder connected to the sealing cover, and a detection disc for pressing against the blocking layer; the output shaft of the working electric cylinder passes through the sealing cover and is detachably connected to the detection disc.

2. The experimental apparatus for simulating and evaluating blockage in chemical flooding injection-production wells according to claim 1, characterized in that, The detection plate includes a piston plate, and a connecting post is formed at the upper end of the piston plate that is detachably connected to the output shaft of the working electric cylinder. A pressure sensor is connected to the connecting post. A sealing ring is embedded in the outer periphery of the piston plate, and the sealing ring is slidably connected to the inner wall of the experimental well.

3. The experimental apparatus for simulating and evaluating blockage in chemical flooding injection-production wells according to claim 2, characterized in that, The pressure sensor is threadedly connected to the connecting post, and the connecting post is threadedly connected to the output shaft.

4. The experimental apparatus for simulating and evaluating blockage in injection-production wells of chemically enhanced oilfields according to any one of claims 1 to 3, characterized in that, The sealing cap includes a sealing cap body for sealing the end of the opening and a threaded ring connected to the lower end of the sealing cap body, the threaded ring being threadedly connected to the inner wall of the experimental well.

5. The experimental apparatus for simulating and evaluating blockage in chemical flooding injection-production wells according to claim 2, characterized in that, The water injection control pipe includes a working water pump, one end of which is connected to a water injection hose and the other end to a connecting hose. The connecting hose is connected to a connector for communicating with the experimental well. A flow sensor and a flow velocity sensor are installed inside the connector.

6. The experimental apparatus for simulating and evaluating blockage in chemical flooding injection-production wells according to claim 5, characterized in that, The flow sensor and velocity sensor are connected to both the front and rear sides of the inside of the connector.

7. The experimental apparatus for simulating and evaluating blockage in chemical flooding injection-production wells according to claim 5, characterized in that, The experimental device for simulating and evaluating blockage in injection and production wells of chemical flooding oilfields also includes a control cabinet. The control cabinet is equipped with a central processing unit, which is electrically connected to the working electric cylinder, the pressure sensor, the working water pump, the flow sensor, and the velocity sensor.

8. The experimental apparatus for simulating and evaluating blockage in injection-production wells of chemically enhanced oilfields according to any one of claims 1 to 3, characterized in that, The plugging layer is a mixture of hydrolyzed polyacrylamide solution and quartz sand.

9. The experimental apparatus for simulating and evaluating blockage in injection-production wells of chemically enhanced oilfields according to any one of claims 1 to 3, characterized in that, The experimental well shaft is made of transparent stainless steel, and the supporting mesh is made of stainless steel.

10. The experimental apparatus for simulating and evaluating blockage in injection-production wells of chemically enhanced oilfields according to any one of claims 1 to 3, characterized in that, The drain valve is positioned lower than the water injection control pipe.

Images