A method and system for measuring parameters of a casing-cement sheath interface

Abstract

The present application belongs to the technical field of well repair operation, and relates to a parameter measurement method for resonant destruction of a casing-cement sheath, which comprises the following steps: acquiring the multi-order natural frequency of a casing system and a casing-cement ring system, the position of a resonant excitation point and the applied excitation acceleration; performing resonant loading on the casing system and the casing-cement ring system according to the multi-order natural frequency of the casing system and the casing-cement ring system, the position of the resonant excitation point and the applied excitation acceleration; evaluating the resonant loading effect, judging whether the interface separation of the casing-cement ring system occurs at the sheath, and outputting the resonant parameters of the casing-cement ring system. The method can realize effective resonance of the casing-cement ring system in actual well repair operation, realize reliable evaluation of the actual effect of the destruction degree of the cement ring after resonant excitation, and determine resonant technical parameters which can be directly used in actual well repair operation.

Description

Technical Field

[0001] The invention belongs to the technical field of well repair operations, and in particular relates to a parameter measurement method and system for resonance-damaged casing-cement sheath bonding surfaces. Background Art

[0002] During the well repair operation, in order to remove the lowered casing, it is necessary to destroy the bonding between the casing and the cement sheath outside the casing, or even break the cement sheath. Among the existing cement sheath breaking technologies, the following methods are generally used: (1) a special tool is lowered into the casing. After the tool expands, it transmits the expansion load to the cement sheath by squeezing the casing, thereby destroying the bonding structure; (2) a vibration tool is lowered into the casing, and a vibration load is applied to the cement sheath through the casing, thereby destroying the bonding structure. Method (1) can easily cause the casing to deform or even be crushed, making it difficult to remove the casing; the vibration parameters, especially the resonance parameters, of method (2) are difficult to obtain, and it is difficult to achieve casing resonance, and the cement sheath breaking effect is average. In other words, the above method does not determine the multi-order natural frequency of the casing, so it is likely that it is difficult to excite the coordinated vibration of the casing, and the vibration load transmission to the cement sheath is not obvious.

[0003] Furthermore, during actual operations, the outer cement sheath of the casing fits tightly against the casing during the cementing phase, limiting its vibration. Therefore, considering only the resonance of the casing is insufficient. It is necessary to consider the casing and cement sheath as a whole and calculate the multi-order natural frequencies (resonance frequencies) of this whole to provide data support for the resonance exciter. Summary of the Invention

[0004] In response to the above problems, the present invention adopts the following technical solution: a method for measuring parameters of the casing-cement sheath bonding surface caused by resonance damage, the method comprising the following steps:

[0005] The multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation accelerations of the casing system and the casing-cement sheath system are obtained respectively;

[0006] Resonant loading is applied to the casing system and the casing-cement sheath system according to their multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation accelerations.

[0007] Evaluate the resonance loading effect and determine whether interface separation of the casing-cement sheath system occurs at the cementing surface;

[0008] Output the resonance parameters of the casing-cement sheath system.

[0009] Furthermore, obtaining the multi-order natural frequencies, the positions of the excitation points, and the excitation accelerations of the casing system includes:

[0010] A finite element model of the casing is established based on the steel grade, length, inner diameter, and outer diameter of the casing. The multi-order natural frequencies of the casing system, the location of the resonant excitation point, and the applied excitation acceleration are obtained through finite element modal analysis and finite element calculation.

[0011] The parameters of the casing system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing system are measured by experimental method;

[0012] The multi-order natural frequencies of the casing system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing system.

[0013] Furthermore, obtaining the multi-order natural frequencies, the positions of the excitation points, and the excitation accelerations of the casing-cement sheath system includes:

[0014] A finite element model of the casing string and cement sheath is established based on the cement sheath wall thickness and the inner and outer diameters of the casing-cement sheath system. Finite element modal analysis is used to obtain the multi-order natural frequencies of the casing-cement sheath system, the locations of the resonant excitation points, and the applied excitation acceleration.

[0015] The parameters of the casing-cement sheath system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing-cement sheath system are measured by experimental method.

[0016] The multi-order natural frequencies of the casing-cement sheath system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing-cement sheath system.

[0017] Furthermore, resonant loading of the casing system according to the multi-order natural frequencies of the casing system, the position of the resonant excitation point and the applied excitation acceleration includes:

[0018] According to the multi-order natural frequencies of the casing system, the positions of the resonance excitation points and the applied excitation acceleration, the different excitation point positions on the inner wall of the casing system are determined, and multiple excitation point positions are loaded individually or simultaneously to excite the casing system to resonance; when the resonance cycle reaches the specified number of cycles, the loading is stopped.

[0019] Furthermore, the loading conditions are set as follows: the loading acceleration is the same as the excitation acceleration applied to the casing system and is freely adjustable within the range of 0.5 to 10 g; the excitation frequency is the same as the multi-order natural frequency of the casing system or the casing-cement sheath system and is freely adjustable within the range of 1 to 3 orders; the resonance time is specified according to the number of cycles and is set within 104 ~10 5 Free adjustment within the cycle range.

[0020] Furthermore, resonant loading of the casing-cement sheath system according to the multi-order natural frequencies of the casing-cement sheath system, the position of the resonant excitation point, and the applied excitation acceleration includes:

[0021] Based on the multi-order natural frequencies of the casing-cement sheath system, the positions of the resonance excitation points, and the applied excitation acceleration, the different excitation point positions on the inner wall of the casing in the casing-cement sheath system, as well as the corresponding positions on the cement sheath end and outer wall, are determined. Loading is then applied simultaneously to multiple excitation point positions to stimulate the resonance of the casing-cement sheath system. Loading is stopped when the resonance cycle reaches the specified number of cycles.

[0022] Furthermore, the loading conditions are set as follows: the loading acceleration is the same as the excitation acceleration applied to the casing-cement sheath system and is freely adjustable within the range of 0.5 to 10 g; the excitation frequency is the same as the multi-order natural frequency of the casing-cement sheath system and is freely adjustable within the range of 1 to 3 orders; the resonance time is specified according to the number of cycles and is set within 10 4 ~10 5 Free adjustment within the cycle range.

[0023] Furthermore, the resonance loading effect is evaluated to determine whether interface separation of the casing-cement sheath system occurs at the cementing surface:

[0024] Detect the integrity of the casing-cement sheath system bonding surface and determine whether the casing-cement sheath system interface separation occurs on the bonding surface;

[0025] If interface separation occurs, pull out the casing and record the load at the time of pull-out;

[0026] If no interface separation occurs, the casing-cement sheath system and the casing system are subjected to resonance loading.

[0027] Furthermore, the resonance parameters of the output casing-cement sheath system include:

[0028] Output casing pull-out load and optimal excitation point position, optimal excitation acceleration, optimal excitation frequency and optimal cycle number of casing string-cement sheath system.

[0029] In addition, the present invention also proposes a parameter measurement system for resonance-damaged casing-cement sheath bonding surface, the system comprising an acquisition module, a resonance loading module, an evaluation module and an output module; wherein,

[0030] The acquisition module is used to respectively acquire the multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation acceleration of the casing system and the casing-cement sheath system;

[0031] The resonance loading module is used to resonate the casing system and the casing-cement sheath system according to their multi-order natural frequencies, the locations of the resonance excitation points, and the applied excitation acceleration.

[0032] The evaluation module is used to evaluate the resonance loading effect and determine whether interface separation of the casing-cement sheath system occurs at the cementing surface;

[0033] The output module is used to output the resonance parameters of the casing-cement sheath system.

[0034] The present invention regards the casing and cement sheath as an integral system and formulates resonance parameters on a system-by-system basis. It adopts a comprehensive measurement method using finite element modal analysis and measuring instruments such as an excitation hammer to determine the multi-order natural frequencies, excitation point positions, and excitation accelerations of the casing-cement sheath system. In the process of destroying the casing-cement sheath bonding surface through resonant loading, the vibration load is not transmitted by striking the inner wall of the casing with the amplitude generated by the resonance of the excitation device itself, but by achieving resonance of the casing-cement sheath system.

[0035] Compared with the existing technology, the method proposed in the present invention can achieve effective resonance of the casing-cement sheath system in actual well repair operations, and realize a reliable evaluation of the actual effect of the degree of cement sheath damage after resonance excitation, and formulate resonance technical parameters that can be directly used in actual on-site well repair operations, including the output casing pull-out load and the optimal excitation point position, optimal excitation acceleration, optimal excitation frequency and optimal cycle number of the casing string-cement sheath system.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 Schematic diagram of a parameter measurement method for resonance-damaged casing-cement sheath bonding surface;

[0039] Figure 2a 、 Figure 2b Schematic diagrams of casing cross section and casing-cement sheath cross section respectively;

[0040] Figure 3 Schematic diagram of a parameter measurement system for destroying the casing-cement sheath bonding surface. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] like Figure 1 As shown, a method for measuring parameters of a resonance-damaged casing-cement sheath bonding surface is provided, the method comprising the following steps: S1, respectively obtaining the multi-order natural frequencies, positions of resonance excitation points, and applied excitation accelerations of the casing system and the casing-cement sheath system; S2, resonantly loading the casing system and the casing-cement sheath system according to the multi-order natural frequencies, positions of resonance excitation points, and applied excitation accelerations of the casing system and the casing-cement sheath system; S3, evaluating the resonance loading effect, and determining whether interface separation of the casing-cement sheath system occurs on the bonding surface; and S4, outputting the resonance parameters of the casing-cement sheath system.

[0043] The method proposed in the present invention regards the casing and cement ring as a system, and determines the multi-order natural frequencies of the system through finite element modal analysis and convenient test methods to guide the working parameters of the high-frequency excitation tool. At the same time, the present invention also provides an evaluation method for the use effect of the cement surface resonance crushing technology in actual operations.

[0044] like Figure 2a The figure shows a schematic diagram of the cross section of the casing, where the z direction is the length direction of the tube and the xy directions are two directions perpendicular to each other in the tube section. Figure 2a Where 1, 2, 3, and 4 are nodes taken at the quarter arc of the casing cross section, and d0 and d1 are the inner and outer diameters of the casing respectively. Figure 2b The figure shows a schematic cross-sectional view of the casing-cement sheath system, where the z direction is the length direction and the xy directions are two directions perpendicular to each other in the cross section. Figure 2b 1', 2', 3', and 4' are nodes taken at the 1 / 4 arc of the casing-cement sheath cross section, and D0 and D1 are the inner diameter and outer diameter of the casing-cement sheath, respectively.

[0045] Specifically, obtaining the multi-order natural frequency, excitation point position and excitation acceleration of the casing system in step S1 includes the following steps: ①, determining the steel grade of the casing system, the length of the casing, and the inner diameter d0 and outer diameter d1 of the casing; ②, establishing a finite element model of the casing system, selecting a node every 1 / 4 arc according to symmetry, that is, Figure 2a The positions of points 1, 2, 3, and 4 in the figure are obtained by modal analysis and finite element calculation to obtain the rough multi-order natural frequencies (f1, f2...f n , n represents the order), and based on the results of the multi-order modes, calculate the resonant amplitude and resonant acceleration under different modal orders, analyze and determine the rough position of the resonant excitation point and the applied excitation acceleration a0; ③ Based on the rough multi-order natural frequencies of the casing system obtained by the finite element calculation in step ②, formulate the test parameters for the experimental method to determine the multi-order natural frequencies of the casing system. From the perspective of actual experiments, use instruments such as excitation hammers to determine the precise multi-order natural frequencies of the casing system. However, since the experimental method cannot obtain the position of the resonant excitation point and the magnitude of the applied excitation acceleration, it is necessary to input the precise multi-order natural frequencies obtained by the experimental method into the finite element simulation software again to calibrate the rough position of the resonant excitation point and the applied excitation acceleration a0 obtained by the finite element calculation, so as to obtain the precise position of the resonant excitation point and the applied excitation acceleration of the casing system.

[0046] Specifically, obtaining the multi-order natural frequencies, the positions of the resonance excitation points, and the applied excitation acceleration of the casing-cement sheath system in step S1 includes the following steps: ① obtaining the modal analysis results of the casing system, and using the modal analysis results of the casing system as a reference for evaluating the reliability of the data results after the modal analysis of the casing-cement sheath system; ② measuring the wall thickness of the cement sheath and the inner diameter D0 and outer diameter D1 of the casing-cement sheath system; ③ selecting a node for each 1 / 4 arc according to the relevant mechanical parameters of the cement sheath (including but not limited to density, elastic modulus, strength, etc.) according to symmetry, that is, Figure 2b The positions of points 1', 2', 3', and 4' in the model are obtained by modal analysis and finite element calculation to obtain the rough multi-order natural frequencies (F1, F2, ... F N, N represents the order), and based on the results of the multi-order modes, calculate the resonance amplitude and resonance acceleration under different modal orders, analyze and determine the position of the resonance excitation point and the applied excitation acceleration A0; ④, based on the rough multi-order natural frequencies of the casing-cement sheath system obtained by the finite element calculation in step ③, formulate the experimental parameters for determining the multi-order natural frequencies of the casing-cement sheath system by the experimental method, and from the actual experimental perspective, use instruments such as the excitation hammer to determine the precise multi-order natural frequencies of the casing-cement sheath system. However, since the experimental method cannot obtain the position of the resonance excitation point and the magnitude of the applied excitation acceleration, it is necessary to input the precise multi-order natural frequencies obtained by the experimental method into the finite element simulation software again, calibrate the rough position of the resonance excitation point and the applied excitation acceleration A0 obtained by the finite element calculation, and thus obtain the precise position of the resonance excitation point and the applied excitation acceleration of the casing-cement sheath system.

[0047] In the above step S1, the casing-cement sheath modal analysis step can be understood as follows: the casing-cement sheath system is a composite system based on the casing string and then adding the cement sheath. That is, the casing-cement sheath system is composed of a casing string model and a cement sheath model, and then the casing-cement sheath system is subjected to finite element modal analysis.

[0048] Specifically, the resonance loading of the casing system in step S2 includes the following steps: Figure 2a As shown, in the casing system, different excitation point positions (p1, p2, p3...) on the inner wall of the casing are loaded using medium-frequency or high-frequency excitation equipment. Here, individual loading or simultaneous loading of several positions can be freely selected. The proposed loading acceleration is the applied excitation acceleration a0 obtained in step S1. In the embodiment of the present invention, a0 can be freely selected in the range of 0.5 to 10g. The excitation frequency can refer to the resonance effect of the casing-cement sheath system and be selected as the multi-order natural frequency (f1 to f3) of the casing system or the multi-order natural frequency (F1 to F3) of the casing-cement sheath system, in order to stimulate the resonance of the casing system. The resonance time is selected to be the same as the resonance time of the casing-cement sheath system. After the resonance cycle reaches the specified number of cycles, the loading is stopped.

[0049] Specifically, the resonant loading of the casing-cement sheath system in step S2 includes the following steps: according to the results obtained by the finite element modal analysis in step S1, determining the different positions (P1, P2, P3...) of the excitation points on the inner wall of the casing in the casing string-cement sheath system, as well as the cement sheath end (P0) and the corresponding positions (P1', P2', P3'...) on the outer wall, such as Figure 2bAs shown, medium frequency or high frequency excitation equipment is used for loading. Here, multiple excitation equipment is generally placed at multiple positions such as P1, P2, P3, P1', P2', and P3' for simultaneous loading. The acceleration of the proposed loading is consistent with the applied excitation acceleration obtained by the finite element modal analysis in step S1, and the applied excitation acceleration is adjusted. In the embodiment of the present invention, it can be freely selected within the range of 0.5 to 10g. The excitation frequency is selected as the multi-order natural frequency of the casing string-cement ring system measured in step S1. In the embodiment of the present invention, it is generally selected as 1 to 3 orders. The casing string-cement ring system is stimulated to resonate, and the resonance time can be adjusted according to the number of resonance cycles. In the embodiment of the present invention, it can be adjusted within the range of 10 4 ~10 5 Freely select within the range, and stop loading after the resonance cycle reaches the specified cycle number;

[0050] Specifically, in step S3, evaluating the resonance loading effect and determining whether interface separation of the casing-cement sheath system occurs on the bonding surface includes the following steps: (1) detecting the integrity of the bonding surface of the casing-cement sheath system using ultrasound or other non-destructive testing equipment to determine whether interface separation of the casing-cement sheath occurs in a partial area of ​​the bonding surface; (2) when the integrity of the bonding surface is destroyed and the casing-cement sheath interface is separated, performing a casing extraction test using a shackle device or other equipment; if the casing can be extracted, recording the load at the time of extraction; if the casing cannot be extracted, repeating step S2.

[0051] Specifically, outputting the resonance parameters of the casing-cement sheath system in step S4 involves the following steps: Based on the casing withdrawal load recorded in step S3, combined with steps S1 and S2, the resonance parameters for this specific casing specification are determined. These parameters include the optimal excitation point location, optimal excitation acceleration, optimal excitation frequency, and optimal cycle number for the casing string-cement sheath system. After fine-tuning and expansion, these resonance parameters can be directly applied in actual on-site well intervention operations.

[0052] In addition, the present invention also proposes a parameter measurement system for resonance damage of casing-cement sheath bonding surface, such as Figure 3 As shown, the system includes an acquisition module, a resonance loading module, an evaluation module and an output module; wherein the acquisition module is used to respectively acquire the multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation acceleration of the casing system and the casing-cement sheath system; the resonance loading module is used to resonantly load the casing system and the casing-cement sheath system according to the multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation acceleration of the casing system and the casing-cement sheath system; the evaluation module is used to evaluate the resonance loading effect and determine whether interface separation of the casing-cement sheath system occurs on the bonding surface; and the output module is used to output the resonance parameters of the casing-cement sheath system.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for measuring parameters of the casing-cement sheath bonding surface by resonance damage, characterized in that: The method comprises the following steps: The multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation accelerations of the casing system and the casing-cement sheath system are obtained respectively; Resonant loading is applied to the casing system and the casing-cement sheath system according to their multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation accelerations. Evaluate the resonance loading effect and determine whether interface separation of the casing-cement sheath system occurs at the cementing surface; Output the resonance parameters of the casing-cement sheath system; Obtaining the multi-order natural frequencies, excitation point locations, and excitation accelerations of the casing system includes: A finite element model of the casing is established based on the steel grade, length, inner diameter, and outer diameter of the casing. The multi-order natural frequencies of the casing system, the location of the resonant excitation point, and the applied excitation acceleration are obtained through finite element modal analysis and finite element calculation. The parameters of the casing system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing system are measured by experimental method; The multi-order natural frequencies of the casing system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing system; Obtaining the multi-order natural frequencies, excitation point locations, and excitation accelerations of the casing-cement sheath system includes: A finite element model of the casing string and cement sheath is established based on the cement sheath wall thickness and the inner and outer diameters of the casing-cement sheath system. Finite element modal analysis is used to obtain the multi-order natural frequencies of the casing-cement sheath system, the locations of the resonant excitation points, and the applied excitation acceleration. The parameters of the casing-cement sheath system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing-cement sheath system are measured by experimental method. The multi-order natural frequencies of the casing-cement sheath system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing-cement sheath system; The resonant loading of the casing-cement sheath system according to the multi-order natural frequencies of the casing-cement sheath system, the position of the resonant excitation point, and the applied excitation acceleration includes: Based on the multi-order natural frequencies of the casing-cement sheath system, the locations of the resonance excitation points, and the applied excitation acceleration, the different excitation points on the inner wall of the casing in the casing-cement sheath system, as well as the corresponding locations on the cement sheath end and outer wall, are determined. Loading is then applied simultaneously to multiple excitation points to stimulate the resonance of the casing-cement sheath system. When the resonance cycle reaches the specified number of cycles, loading is stopped. The loading conditions are set as follows: the loading acceleration is the same as the excitation acceleration applied to the casing-cement sheath system and is freely adjustable within the range of 0.5-10g; the excitation frequency is the same as the multi-order natural frequency of the casing-cement sheath system and is freely adjustable within the range of 1-3 orders; the resonance time is specified according to the cycle number and is set within 10 4 ~10 5 Free adjustment within the cycle range.

2. The method according to claim 1, characterized in that The resonant loading of the casing system according to the multi-order natural frequencies of the casing system, the position of the resonant excitation point and the applied excitation acceleration includes: According to the multi-order natural frequencies of the casing system, the positions of the resonance excitation points and the applied excitation acceleration, the different excitation point positions on the inner wall of the casing system are determined, and multiple excitation point positions are loaded individually or simultaneously to excite the casing system to resonance; when the resonance cycle reaches the specified number of cycles, the loading is stopped.

3. The method according to claim 2, characterized in that The loading conditions are set as follows: the loading acceleration is the same as the excitation acceleration applied to the casing system and is freely adjustable within the range of 0.5 to 10 g; the excitation frequency is the same as the multi-order natural frequency of the casing system or the casing-cement sheath system and is freely adjustable within the range of 1 to 3 orders; the resonance time is specified according to the number of cycles and is set within 10 4 ~10 5 Free adjustment within the cycle range.

4. The method according to claim 1, wherein The resonance loading effect is evaluated to determine whether interface separation of the casing-cement sheath system occurs at the cementing surface: Detect the integrity of the casing-cement sheath system bonding surface and determine whether the casing-cement sheath system interface separation occurs on the bonding surface; If interface separation occurs, pull out the casing and record the load at the time of pull-out; If no interface separation occurs, the casing-cement sheath system and the casing system are subjected to resonance loading.

5. The method according to claim 4, characterized in that The resonance parameters of the output casing-cement ring system include: Output casing pull-out load and optimal excitation point position, optimal excitation acceleration, optimal excitation frequency and optimal cycle number of casing string-cement sheath system.

6. A parameter measurement system for resonance-damaged casing-cement sheath bonding surface, characterized in that: The system includes an acquisition module, a resonance loading module, an evaluation module and an output module; wherein, The acquisition module is used to respectively acquire the multi-order natural frequencies, the positions of the resonance excitation points and the applied excitation acceleration of the casing system and the casing-cement sheath system; The resonance loading module is used to resonate the casing system and the casing-cement sheath system according to their multi-order natural frequencies, the locations of the resonance excitation points, and the applied excitation acceleration. The evaluation module is used to evaluate the resonance loading effect and determine whether interface separation of the casing-cement sheath system occurs at the cementing surface; The output module is used to output the resonance parameters of the casing-cement sheath system; Obtaining the multi-order natural frequencies, excitation point locations, and excitation accelerations of the casing system includes: A finite element model of the casing is established based on the steel grade, length, inner diameter, and outer diameter of the casing. The multi-order natural frequencies of the casing system, the location of the resonant excitation point, and the applied excitation acceleration are obtained through finite element modal analysis and finite element calculation. The parameters of the casing system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing system are measured by experimental method; The multi-order natural frequencies of the casing system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing system; Obtaining the multi-order natural frequencies, excitation point locations, and excitation accelerations of the casing-cement sheath system includes: A finite element model of the casing string and cement sheath is established based on the cement sheath wall thickness and the inner and outer diameters of the casing-cement sheath system. Finite element modal analysis is used to obtain the multi-order natural frequencies of the casing-cement sheath system, the locations of the resonant excitation points, and the applied excitation acceleration. The parameters of the casing-cement sheath system are set based on the multi-order natural frequencies obtained by finite element calculation, and the multi-order natural frequencies of the casing-cement sheath system are measured by experimental method. The multi-order natural frequencies of the casing-cement sheath system measured by the experimental method are input into the finite element simulation software again to calibrate the position of the resonance excitation point and the applied excitation acceleration obtained by the finite element calculation, thereby obtaining the precise position of the resonance excitation point and the applied excitation acceleration of the casing-cement sheath system; The resonant loading of the casing-cement sheath system according to the multi-order natural frequencies of the casing-cement sheath system, the position of the resonant excitation point, and the applied excitation acceleration includes: Based on the multi-order natural frequencies of the casing-cement sheath system, the locations of the resonance excitation points, and the applied excitation acceleration, the different excitation points on the inner wall of the casing in the casing-cement sheath system, as well as the corresponding locations on the cement sheath end and outer wall, are determined. Loading is then applied simultaneously to multiple excitation points to stimulate the resonance of the casing-cement sheath system. When the resonance cycle reaches the specified number of cycles, loading is stopped. The loading conditions are set as follows: the loading acceleration is the same as the excitation acceleration applied to the casing-cement sheath system and is freely adjustable within the range of 0.5-10g; the excitation frequency is the same as the multi-order natural frequency of the casing-cement sheath system and is freely adjustable within the range of 1-3 orders; the resonance time is specified according to the cycle number and is set within 10 4 ~10 5 Free adjustment within the cycle range.

Images