A test system for a downhole casing hanging system

Abstract

The utility model discloses a kind of test systems of mud under casing suspension system, it is related to petroleum drilling engineering technical field.Test system includes: casing pedestal, including bottom plate, fixed in the center column of bottom plate upper, multiple guide plates are set in the outer periphery of center column, each guide plate is sequentially arranged around the outer periphery of center column;Simulation casing, its one end in axial direction is provided with multiple guide grooves, simulation casing is sleeved in the outside of center column, the outer periphery surface of center column supports simulation casing, each guide groove is respectively inserted in each guide plate downwards, the top surface of bottom plate supports the bottom surface of simulation casing.In test before, the bottom end of simulation casing is sleeved in the outside of casing pedestal, by center column in simulation casing inside provides certain radial constraint, and guide plate and guide groove insert joint cooperation to guide in casing process, bottom plate is axially limited to simulation casing, can prevent simulation casing deviation or deformation, improve the stability of simulation casing in test process.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling engineering technology, and in particular to a testing system for a mud casing suspension system. Background Technology

[0002] The mud casing suspension system is a critical downhole device in oil drilling engineering, used to ensure the stability and sealing of the wellbore. In practical applications, the mud casing suspension system needs to undergo rigorous performance testing to verify its performance and reliability under high pressure and high load conditions.

[0003] Currently, some performance tests for mud-sleeve suspension systems lack dedicated tooling for locating the simulated sleeve, which affects the stability of the simulated sleeve during testing and may lead to repeated testing due to inaccurate positioning, thus impacting overall testing efficiency.

[0004] Therefore, how to improve the stability of the simulated sleeve during the testing process is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a test system for a mud-sleeve suspension system that simulates the high stability of the sleeve during the test process.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A testing system for a mud-covered casing suspension system includes: a casing base, comprising a base plate, a central column fixed above the base plate, and multiple guide plates disposed on the outer periphery of the central column, the guide plates being arranged sequentially around the outer periphery of the central column; a simulated casing, having multiple guide grooves at one axial end, the simulated casing being sleeved on the outside of the central column, the outer peripheral surface of the central column supporting the simulated casing, each guide groove being inserted downwards into each of the guide plates, and the top surface of the base plate supporting the bottom surface of the simulated casing.

[0008] Preferably, the central column is cylindrical and is an annular body that runs through the axis.

[0009] Preferably, the central column includes an upper column and a lower column fixed below the upper column, the lower column being fixed above the base plate; the lower column protrudes radially outward relative to the upper column, so that an upward-facing stepped surface is formed between the upper column and the lower column; the guide plate is disposed on the outer periphery of the upper column and located above the stepped surface, and protrudes radially outward relative to the lower column; the base plate protrudes radially outward from the lower column.

[0010] Preferably, the outer circumferential surface of the upper column is provided with a slot, and one end of the guide plate in the radial direction is inserted and fixed in the slot.

[0011] Preferably, the guide plates are evenly arranged on the outside of the central column.

[0012] Preferably, the simulated sleeve includes an upper sleeve and a lower sleeve arranged sequentially along the axial direction. The guide groove is provided on the lower sleeve at one end away from the upper sleeve. A connecting ring is provided between the upper sleeve and the lower sleeve, and the connecting ring connects the upper sleeve and the lower sleeve respectively through a sealing ring. The inner circumferential surface of the connecting ring protrudes radially inward relative to the upper sleeve and the lower sleeve.

[0013] Preferably, it further includes: a loading device for loading the simulated sleeve; a pressure sensor, a strain gauge, and a displacement sensor respectively disposed on the simulated sleeve; and a control device electrically connected to the pressure sensor, the strain gauge, and the displacement sensor.

[0014] Preferably, the loading device includes: a hydraulic loading device for injecting hydraulic oil into the simulated sleeve to provide hydraulic pressure; and / or a mechanical loading device for applying an axial load to the simulated sleeve.

[0015] Preferably, the plurality of pressure sensors are evenly arranged along the axial direction of the simulated sleeve and are disposed on the inner circumferential surface of the simulated sleeve.

[0016] Preferably, the two displacement sensors are respectively disposed at the top and bottom of the simulated sleeve, and the displacement sensors are used to detect the axial or radial displacement of the simulated sleeve.

[0017] The testing system for the mud casing suspension system provided by this utility model includes: a casing base, including a base plate, a central column fixed above the base plate, and multiple guide plates disposed on the outer periphery of the central column, with each guide plate arranged sequentially around the outer periphery of the central column; a simulated casing, which has multiple guide grooves at one end in the axial direction, the simulated casing being sleeved on the outside of the central column, the outer periphery of the central column supporting the simulated casing, each guide groove being inserted downwards into each guide plate, and the top surface of the base plate supporting the bottom surface of the simulated casing.

[0018] Before testing, the bottom end of the simulated sleeve is fitted onto the outside of the sleeve base. The central column provides a certain radial constraint inside the simulated sleeve. The guide plate and guide groove are inserted and fitted together to guide the simulated sleeve as it is fitted downward onto the outside of the central column. The base plate provides axial positioning and support for the simulated sleeve, which can prevent the simulated sleeve from shifting or deforming. This helps to improve the stability of the simulated sleeve during the testing process, thereby improving testing efficiency. In addition, this type of sleeve base has a simple structure and is easy to manufacture. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the assembly of the simulated sleeve and sleeve base in a specific embodiment provided by this utility model;

[0021] Figure 2 This is an axonometric view of the sleeve base in a specific embodiment provided by this utility model;

[0022] Figure 3 This is a front view of the sleeve base in a specific embodiment of the present invention;

[0023] Figure 4 This is a top view of the sleeve base in a specific embodiment of the present invention;

[0024] Figure 5 for Figure 4 Enlarged view of point C;

[0025] Figure 6 This is a structural diagram of the simulated sleeve provided in a specific embodiment of the present invention;

[0026] Figure 7 This is a top view of the simulated sleeve in a specific embodiment of the present invention;

[0027] Figure 8 for Figure 7 AA cross-section view;

[0028] Figure 9 for Figure 8 Enlarged view of point B;

[0029] Figure 10 This is a schematic diagram of the test system in a specific embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the test system provided in a specific embodiment of the present invention.

[0031] Figure label:

[0032] Simulation sleeve 1, guide groove 11, upper sleeve 12, lower sleeve 13, sealing ring 14, connecting ring 15;

[0033] Sleeve base 2, central column 21, upper column 211, lower column 212, stepped surface 213, base plate 22, guide plate 23;

[0034] Mechanical loading device 3;

[0035] Pressure sensor 4;

[0036] Strain gauge 5;

[0037] Displacement sensor 6;

[0038] 7. Hydraulic loading device. Detailed Implementation

[0039] 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.

[0040] The core of this invention is to provide a testing system for a mud-sleeve suspension system that simulates the high stability of the sleeve during the testing process.

[0041] For a specific embodiment of the testing system of the mud casing suspension system provided by this utility model, please refer to the following: Figures 1 to 11 It includes the sleeve base 2 and the simulated sleeve 1.

[0042] The sleeve base 2 includes a base plate 22, a central column 21 fixed above the base plate 22, and multiple guide plates 23 arranged around the outer periphery of the central column 21.

[0043] Multiple guide grooves 11 are provided at one end of the simulated sleeve 1 in the axial direction. The simulated sleeve 1 is sleeved on the outside of the central column 21. The outer circumferential surface of the central column 21 supports the simulated sleeve 1, and each guide groove 11 is inserted downward into each guide plate 23 respectively. The top surface of the bottom plate 22 supports the bottom surface of the simulated sleeve 1.

[0044] The simulated sleeve 1 is used to simulate the actual sleeve under test, such as a 30-inch sleeve, including its dimensions and material, to obtain the performance of this sleeve in applications. Specifically, the simulated sleeve 1 uses the same material as the actual sleeve under test it simulates, ensuring the representativeness of the test results. Regarding the dimensions of the simulated sleeve 1, its outer diameter can be the same as the sleeve under test. For example, if the sleeve under test is a 30-inch sleeve, the simulated sleeve 1 is 3 meters long, has the same outer diameter as the actual 30-inch sleeve, and a slightly thicker wall to enhance test safety.

[0045] At this time, before the test, the bottom end of the simulated sleeve 1 is fitted onto the outside of the sleeve base 2. The central column 21 provides a certain radial constraint inside the simulated sleeve 1. The guide plate 23 is inserted and engaged with the guide groove 11. During the process of the simulated sleeve 1 being fitted downward onto the outside of the central column 21, it provides guidance. The base plate 22 provides axial limit and support for the simulated sleeve 1. This allows the simulated sleeve 1 to remain vertical during the test, preventing displacement or deformation. This helps to improve the stability of the simulated sleeve 1 during the test, thereby improving the test efficiency. In addition, this sleeve base 2 has a simple structure and is easy to process.

[0046] In some embodiments, the sleeve base 2 is made of alloy steel, specifically high-strength alloy steel, to ensure structural stability under high-pressure test conditions.

[0047] In some embodiments, such as Figures 1 to 4 As shown, the central column 21 is cylindrical to match the structure of the circular simulated sleeve 1, thereby improving positioning capability. The central column 21 is an axially continuous annular body to reduce material consumption and help reduce the weight of the sleeve base 2.

[0048] In some embodiments, such as Figure 1 and Figure 2 As shown, the central column 21 includes an upper column 211 and a lower column 212 fixed below the upper column 211. The lower column 212 is fixed above the base plate 22. The lower column 212 protrudes radially outward relative to the upper column 211, forming an upward-facing stepped surface 213 between the upper column 211 and the lower column 212. In this case, the lower column 212 serves to radially support the simulated sleeve 1. A guide plate 23 is located on the outer periphery of the upper column 211, above the stepped surface 213, and protrudes radially outward relative to the lower column 212 to ensure that the guide plate 23 can engage with the corresponding guide groove 11. The base plate 22 protrudes radially outward from the lower column 212. In this case, the guide plate 23 can also serve as a reinforcing rib between the upper column 211 and the lower column 212, resulting in high overall structural strength.

[0049] In some embodiments, to ensure smooth connection, the maximum outer diameter of the lower column 212 may be slightly smaller than the inner diameter of the simulated sleeve 1, ensuring both limiting capability and radial support and limiting capability. For example, the outer diameter of the lower column 212 may be smaller than the inner diameter of the simulated sleeve 1, with a difference between 0.5 and 1 cm.

[0050] In some embodiments, to improve connection stability, such as Figure 2 As shown, multiple guide plates 23 are evenly distributed on the outside of the central column 21. For example, there are three guide plates 23, which are evenly distributed on the outside of the central column 21, with adjacent guide plates 23 spaced 120° apart. In addition, on the inner wall of the simulated sleeve 1, guide grooves 11 are matched with each guide plate 23 so that they can be inserted one by one.

[0051] In some embodiments, to achieve the assembly of the guide plate 23, such as Figure 5 As shown, the outer circumferential surface of the upper column 211 is provided with a slot, and one end of the guide plate 23 is inserted and fixed in the slot in the radial direction, which facilitates assembly. In other embodiments, the guide plate 23 can be integrally formed on the central column 21.

[0052] In some embodiments, such as Figures 6 to 9 As shown, the simulated sleeve 1 includes an upper sleeve 12 and a lower sleeve 13 arranged sequentially along the axial direction. A guide groove 11 is provided on the lower sleeve 13 at one end away from the upper sleeve 12. A connecting ring 15 is provided between the upper sleeve 12 and the lower sleeve 13, and the connecting ring 15 is connected to the upper sleeve 12 and the lower sleeve 13 respectively through a sealing ring 14. The inner circumferential surface of the connecting ring 15 protrudes radially inward relative to the upper sleeve 12 and the lower sleeve 13, and can be used to assemble and connect with other sleeves. Optionally, the sealing ring 14 is a high-pressure resistant rubber sealing ring, and can be connected to the upper sleeve 12 or the lower sleeve 13 by cooperating with a metal clamp.

[0053] Furthermore, to simulate the pressure under actual working conditions, such as Figure 10 and Figure 11 As shown, the testing system also includes a loading device for loading the simulated sleeve 1, and a pressure sensor 4, a strain gauge 5 and a displacement sensor 6 respectively installed on the simulated sleeve 1. It also includes a control device that is electrically connected to the pressure sensor 4, the strain gauge 5 and the displacement sensor 6.

[0054] At this time, the loading device can load the simulated sleeve 1 according to the set requirements. The pressure sensor 4, strain gauge 5, and displacement sensor 6 can monitor the pressure, strain, and deformation of the simulated sleeve 1 in real time during the loading process. The data detected by the strain gauge 5 and displacement sensor 6 are transmitted to the control device. After being processed by the preset processing program in the control device, a detailed mechanical performance report is generated. This allows for a comprehensive analysis of the performance changes of the simulated sleeve 1 under selected working conditions. For example, the stacking test of the sleeve can be performed, and the pressure, load, and sealing performance tests under simulated actual working conditions can be performed.

[0055] In some embodiments, the loading device includes a hydraulic loading device 7 and a mechanical loading device 3. The hydraulic loading device 7 is used to inject hydraulic oil into the simulated sleeve 1 to provide hydraulic pressure, and the mechanical loading device 3 is used to apply an axial load to the simulated sleeve 1 to simulate the suspension load under actual working conditions.

[0056] In some embodiments, the mechanical loading device 3 can apply an axial load to the simulated casing 1 via a loading screw to simulate the actual casing's suspension load downhole. For example, the mechanical loading device 3 includes a top loading screw and a bottom loading screw. The top loading screw is connected to the top end of the simulated casing 1, and the bottom loading screw is connected to the bottom end of the simulated casing 1. By controlling the rotation direction and force of the top and bottom loading screws, axial forces of different magnitudes and directions can be applied to the simulated casing 1. This loading method can highly replicate the complex stress conditions of the simulated casing 1 during downhole operations caused by factors such as suspension weight, formation pressure, and its own gravity.

[0057] In some embodiments, a plurality of pressure sensors 4 are evenly arranged along the axial direction of the simulated sleeve 1, for example, six, and the pressure sensors 4 are located on the inner circumferential surface of the simulated sleeve 1. During pressure testing, the high-pressure pump in the hydraulic loading device 7 injects hydraulic oil into the simulated sleeve 1, gradually increasing the pressure to the set pressure value. The pressure sensors 4 can monitor the pressure in real time and transmit the data to the control device so that the operator can keep track of the pressure dynamics at any time.

[0058] In some embodiments, the simulated sleeve 1 is also connected to a safety valve, which automatically opens when the pressure exceeds a set safety threshold to quickly release excess hydraulic oil, thereby effectively preventing the simulated sleeve 1 from causing a safety accident due to overpressure.

[0059] In some embodiments, multiple strain gauges 5 may be provided and respectively installed at key locations on the outer wall of the simulated sleeve 1, such as the suspension connection, specifically the top of the sleeve, and / or the sealing surface inside the simulated sleeve 1 used to connect other sleeves, to monitor the strain of the sleeve.

[0060] In some embodiments, two displacement sensors 6 are respectively disposed at the top and bottom of the simulated sleeve 1. The displacement sensors 6 are used to detect the axial or radial displacement of the simulated sleeve 1. Since the simulated sleeve 1 may undergo a certain degree of axial expansion or compression deformation when subjected to axial load, and may also exhibit radial expansion or contraction, optionally, the displacement sensor 6 at the top can monitor the displacement change of the simulated sleeve 1 in the axial direction, while the displacement sensor 6 at the bottom can mainly be used to monitor the displacement change of the simulated sleeve 1 in the radial direction. The control device can analyze the deformation capacity and stability of the simulated sleeve 1 under axial load based on these displacement data measured by the displacement sensors 6 at the top and bottom.

[0061] In some embodiments, the data collected by the pressure sensor 4, strain gauge 5, and displacement sensor 6 can be transmitted to the control device via a data cable. The analysis software developed based on MATLAB or LabVIEW in the control device processes and analyzes the data to plot pressure-displacement curves, strain distribution diagrams, etc., and automatically evaluates the test results.

[0062] The testing system in this embodiment, based on the application of the casing base 2, can significantly reduce hidden costs such as repetitive operations, equipment wear and tear, and wasted time caused by positioning problems. It can achieve high precision, high stability, and high efficiency in testing, thereby reducing operating costs. The casing base 2 has versatility and high adaptability, and can be used in various marine environments and operating conditions without frequent equipment replacement or modification, thus improving economic efficiency and providing strong support for cost control in offshore oil exploration and development projects. The casing base 2, the simulated casing 1, the hydraulic loading device 7, the mechanical loading device 3, and the control device work together to form an integrated design, a complete and powerful testing system that can comprehensively simulate actual working conditions, accurately monitor the performance of the casing under various conditions, and ensure the accuracy and reliability of test data. The simulated casing 1 has a slightly thicker wall than the actual casing, which can improve testing safety. The hydraulic loading device 7 is equipped with a safety valve to prevent overpressure and ensure the safety and stability of the testing process.

[0063] The aforementioned test system for the mud-under casing suspension system can be applied to a test method for the mud-under casing suspension system. Specifically, it can be the test system provided in any of the above embodiments. The beneficial effects can be referred to in the above embodiments to evaluate the performance of different aspects of the mud-under casing suspension system. It can comprehensively simulate actual working conditions, and the test results have good accuracy and reliability, which can improve test efficiency.

[0064] In a specific embodiment of this testing method, the following is included:

[0065] S1: The bottom end of the simulated sleeve 1 is connected to the sleeve base 2.

[0066] During the process of connecting the bottom end of the simulated sleeve 1 to the sleeve base 2, the bottom surface of the sleeve base 2 is fixed on the test platform, for example, by bolting, and the verticality error of the central column 21 is ensured to be less than 0.1%. The simulated sleeve 1 is vertically installed inside the central column 21, and a sealing device can be set between the sleeve base 2 and the simulated sleeve 1 to ensure that there is no leakage in the hydraulic pipeline.

[0067] After the simulated sleeve 1 is installed on the sleeve base 2, the pressure sensor 4, strain gauge 5 and displacement sensor 6 installed on the simulated sleeve 1 can be calibrated to ensure the accuracy of data acquisition.

[0068] After the simulated sleeve 1 is installed on the sleeve base 2, the simulated sleeve 1 is connected to the hydraulic loading device 7 and the mechanical loading device 3, and the sealing or stability of the connection is checked.

[0069] S2: Conduct stress testing. Stress testing specifically includes:

[0070] S21: Control the hydraulic loading device 7 to supply hydraulic oil to the simulated sleeve 1, starting from 0MPa and gradually loading, increasing the pressure by the same amount each time to enter different pressure stages, until the preset limit pressure value is reached, and maintaining the same loading time in each pressure stage.

[0071] In some embodiments, the same pressure is increased each time, by 10 MPa, and the loading time is 10 minutes.

[0072] S22: At each pressure stage, acquire data from pressure sensor 4, strain gauge 5, and displacement sensor 6 on the simulated sleeve 1.

[0073] Based on the data obtained from pressure sensor 4, strain gauge 5, and displacement sensor 6, pressure-strain curves and pressure-displacement curves can be plotted. Combined with the inspection of whether there is leakage or deformation on the surface of the simulated sleeve 1, the observation results can be recorded.

[0074] By analyzing the pressure data from pressure sensor 4, the internal pressure changes of the simulated sleeve 1 can be determined to see if they are within the preset requirements. Specifically, if the pressure is stable and there is no pressure drop, it indicates that the sealing performance is good, and the simulated sleeve 1 has no risk of leakage under the selected pressure.

[0075] Specifically, data from displacement sensor 6 is used to analyze whether the axial and radial displacements of the simulated sleeve 1 are within the allowable range. Data from strain gauge 5 is used to plot a strain distribution diagram to analyze the plastic deformation of the simulated sleeve 1. If both strain and displacement are within the allowable range, the deformation of the simulated sleeve 1 meets the requirements, the pressure test is passed, and this simulated sleeve 1 can withstand the set hydraulic pressure.

[0076] Furthermore, before, after, or simultaneously with the stress test, the S3 load test is performed. The load test specifically includes the following steps:

[0077] S31: Control the mechanical loading device to apply axial load, starting from 0kN, increasing the same load each time to enter different load stages until the preset limit load value is reached, and maintaining the same detection time in each load stage.

[0078] For example, each time the same load is increased by 100kN, the ultimate load value is 500kN, and the detection time is 5 minutes.

[0079] Based on the data from pressure sensor 4, strain gauge 5, and displacement sensor 6, the ability of the simulated sleeve 1 to withstand axial loads can be determined.

[0080] Furthermore, it also includes: conducting load testing concurrently with stress testing for comprehensive testing, specifically including:

[0081] S41: Control the hydraulic loading device 7 to provide the first ultimate hydraulic pressure to the simulated sleeve 1, and at the same time control the mechanical loading device to apply the first ultimate axial load to the simulated sleeve 1.

[0082] At this time, applying the ultimate hydraulic pressure and axial load to the simulated casing 1 simultaneously can simulate extreme working conditions.

[0083] S42: Acquire data from pressure sensor 4, strain gauge 5, and displacement sensor 6 on the simulated sleeve 1.

[0084] At this point, based on the acquired data, the sealing performance, strain distribution, and displacement of the simulated sleeve 1 can be continuously monitored, the data recorded and analyzed, and the overall performance of the simulated sleeve 1 evaluated based on the test results. If the internal pressure of the simulated sleeve 1 reaches the preset limit value and there is no leakage, it is considered to have qualified sealing performance; if the displacement of the simulated sleeve 1 is within the design allowable range, it is considered to have qualified mechanical performance; and if the sleeve does not show significant deformation or failure under extreme working conditions, it is considered to have qualified overall performance.

[0085] The testing method in this application embodiment can sequentially perform pressure testing, load testing, and comprehensive testing to achieve phased testing. Each phase has clear loading steps, stabilization time, data collection, and judgment criteria, progressing step by step to comprehensively evaluate the sealing performance, mechanical performance, and overall performance of the sleeve suspension system. This effectively identifies potential problems and provides a scientific basis for system optimization. By combining multi-dimensional data such as pressure, strain, and displacement, curves are plotted and analyzed using professional software to comprehensively judge system performance, ensuring a comprehensive and accurate evaluation. This avoids the one-sidedness of single-index evaluation, improves the credibility and reference value of test results, and enables multi-dimensional performance evaluation.

[0086] It should be noted that when an element is referred to as "fixing" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as "connecting" another element, it can be directly connected to the other element or there may be an intervening element. Furthermore, in the description of this utility model, unless otherwise stated, "multiple," "multiple roots," and "multiple groups" mean two or more.

[0087] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0088] 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.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] The above provides a detailed description of the testing system for the mud casing suspension system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A testing system for a mud-covered casing suspension system, characterized in that, include: The sleeve base (2) includes a base plate (22), a central column (21) fixed above the base plate (22), and a plurality of guide plates (23) disposed on the outer periphery of the central column (21), wherein each guide plate (23) is arranged sequentially around the outer periphery of the central column (21); The simulated sleeve (1) has multiple guide grooves (11) at one end in the axial direction. The simulated sleeve (1) is sleeved on the outside of the central column (21). The outer circumferential surface of the central column (21) supports the simulated sleeve (1). Each guide groove (11) is inserted downward into each guide plate (23). The top surface of the bottom plate (22) supports the bottom surface of the simulated sleeve (1).

2. The testing system according to claim 1, characterized in that, The central column (21) is cylindrical and is an annular body that runs through the axis.

3. The testing system according to claim 1, characterized in that, The central column (21) includes an upper column (211) and a lower column (212) fixed below the upper column (211). The lower column (212) is fixed above the base plate (22). The lower column (212) protrudes radially outward relative to the upper column (211) to form an upward-facing stepped surface (213) between the upper column (211) and the lower column (212). The guide plate (23) is located on the outer periphery of the upper column (211) and above the stepped surface (213), and protrudes radially outward relative to the lower column (212). The base plate (22) protrudes radially outward from the lower column (212).

4. The testing system according to claim 3, characterized in that, The outer circumferential surface of the upper column (211) is provided with a slot, and one end of the guide plate (23) is inserted and fixed in the slot in the radial direction.

5. The testing system according to claim 1, characterized in that, Multiple guide plates (23) are evenly arranged on the outside of the central column (21).

6. The testing system according to claim 1, characterized in that, The simulated sleeve (1) includes an upper sleeve (12) and a lower sleeve (13) arranged sequentially along the axial direction. The guide groove (11) is provided on the lower sleeve (13) at one end away from the upper sleeve (12). A connecting ring (15) is provided between the upper sleeve (12) and the lower sleeve (13), and the connecting ring (15) connects the upper sleeve (12) and the lower sleeve (13) respectively through a sealing ring (14). The inner circumferential surface of the connecting ring (15) protrudes radially inward relative to the upper sleeve (12) and the lower sleeve (13).

7. The testing system according to claim 1, characterized in that, Also includes: A loading device is used to load the simulated sleeve (1); Pressure sensor (4), strain gauge (5) and displacement sensor (6) are respectively installed on the simulated sleeve (1). The control device is electrically connected to the pressure sensor (4), the strain gauge (5), and the displacement sensor (6).

8. The testing system according to claim 7, characterized in that, The loading device includes: a hydraulic loading device (7) for injecting hydraulic oil into the simulated sleeve (1) to provide hydraulic pressure; and / or a mechanical loading device (3) for applying an axial load to the simulated sleeve (1).

9. The testing system according to claim 7, characterized in that, Multiple pressure sensors (4) are evenly arranged along the axial direction of the simulated sleeve (1) and are located on the inner circumferential surface of the simulated sleeve (1).

10. The testing system according to claim 7, characterized in that, Two displacement sensors (6) are respectively located at the top and bottom of the simulated sleeve (1), and the displacement sensors (6) are used to detect the axial or radial displacement of the simulated sleeve (1).

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