Method and device for analyzing self-healing ability of well cementation cement stone

Abstract

The invention discloses a well cementation cement stone self-healing ability analysis method and device, and relates to the technical field of petroleum and natural gas exploration and development, and the device comprises a cement sheath maintenance crack-forming module, a CT scanning module, a data processing module, a simulation casing internal pressure pressurization system, a crude oil pressurization pump and a gas bottle; wherein a double-layer simulated cement sheath is arranged in the cement sheath maintenance crack-forming module; the simulation casing pipe internal pressure pressurization system is matched with the gas bottle to be used for carrying out crack forming treatment on the double-layer simulation cement sheath; the crude oil pressure pump is matched with the gas bottle to carry out self-healing maintenance test on the double-layer simulated cement sheath subjected to crack forming treatment; the CT scanning module is used for carrying out lossless scanning on the double-layer simulated cement sheath in the self-healing maintenance test process of the double-layer simulated cement sheath and transmitting scanning data to the data processing module; and the data processing module is used for determining the analysis result of the self-healing capability of the well cementation cement stone. The method can improve the reliability and rationality of the analysis result of the self-healing ability of the set cement.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration and development, and in particular to a method and a device for analyzing the self-healing ability of cementing stone. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] With the exploitation of natural gas in deep formations, the annulus pressure problem is becoming more and more serious. The cement ring of oil and gas well cementing may produce micro gaps or micro cracks under the action of external forces. If the damage continues to develop, it is likely to cause serious problems such as cement ring isolation failure. Common cementing methods used to solve such problems include the use of high mechanical elastic expansion cement slurry and self-healing cement slurry system with self-healing properties. The elastic expansion cement slurry system is mainly used to deal with perforation and fracturing during completion operations. It can effectively deal with cement stone damage caused by tension and compression, but once the cement stone is damaged, it cannot achieve the effect of self-repair; the self-healing cement slurry system can solve the oil and gas crossflow problem caused by cement ring damage through self-diagnosis and repair technology. After years of development, great progress has been made in the formulation of self-healing cement slurry at home and abroad, but there are still many defects in the evaluation of the corresponding cement stone self-healing ability, and there is still no recognized analytical method for the evaluation of cement self-healing ability.

[0004] The existing methods for analyzing the self-healing ability of cementing stone mainly include:

[0005] (1) Mechanical properties analysis method:

[0006] This method is to compare and analyze the self-healing ability of cementing cement by testing the mechanical properties (including compressive strength, flexural strength, tensile strength and bonding strength, etc.) of cement stone before destruction (or before healing) and after healing and curing. The test method includes: curing cement stone test blocks under certain conditions, preparing samples after a certain period of curing, testing the compressive strength, flexural strength and tensile strength of the samples, placing the samples that have been destroyed after the test in the curing device for continued curing, and then measuring the mechanical properties data such as compressive strength, flexural strength and tensile strength of the samples after curing for a period of time, and monitoring the recovery of the mechanical properties of cement samples with different curing times. Usually, the ratio of the mechanical properties data before and after healing is used as the healing index of self-healing cement.

[0007] (2) Acoustic emission method:

[0008] The phenomenon of releasing strain energy in the form of elastic waves when a structure is deformed or fractured by force is called acoustic emission. Acoustic emission is a dynamic, passive monitoring technology that does not require external energy like ultrasonic technology. It can truly achieve online, real-time monitoring, and can quickly reflect the damage state and defect location of the material, greatly saving monitoring time and reducing costs. According to research results at home and abroad, acoustic emission technology can effectively monitor the generation and expansion of concrete cracks, and is very sensitive to internal changes in components. Before and after concrete healing, due to internal changes in components, it will be manifested as different acoustic emission signals on a macro scale. Cracks that do not expand will not generate acoustic emission signals. The presence or absence of acoustic emission signals and the characteristic changes of the signals can be used to judge the self-healing effect of concrete and its damage evolution process.

[0009] (3) Conductivity method:

[0010] For example, the Chinese patent number CN104502419B discloses a device and method for evaluating the self-healing ability of self-healing cement. This method measures the conductivity of the electrolyte solution in the through-hole of the cement stone, calculates the percentage of reduction in the effective cross-sectional area of ​​the through-hole at the axial center of the cement stone, and quantitatively evaluates the self-healing ability of the cement stone; at the same time, this method can measure the conductivity of the electrolyte solution in the through-hole of the cement stone at different ages, reflect the change in the cross-sectional area of ​​the through-hole of the cement stone at different ages, and quantitatively monitor the self-healing process. The self-healing ability K of the cement stone is expressed as the percentage of the cross-sectional area of ​​the through-hole reduced after t time.

[0011] (4) Permeability / flow change analysis method:

[0012] The permeability / flow change analysis method is currently the most widely accepted method for analyzing the self-healing ability of cement paste. This method uses a CT scanner to measure the pore size of the cement paste module after the experiment, and tests the permeability of the cement paste before and after self-healing; the self-healing performance of the self-healing cement paste after gas erosion is analyzed based on the changes in permeability and pore size. The mechanical property evaluation method cannot reflect the seepage of formation fluids in the microcracks of the cement sheath, while the permeability measurement method can directly reflect the seepage of fluids in the microcracks of the cement sheath. The method of analyzing the healing of cement sheaths by cement paste permeability has been recognized in the cementing field, but there is no unified test method. The main test process of this method is: curing cement paste test blocks under certain conditions, simulating microcracks through different degrees of damage, and then continuously monitoring the permeability change trend of cement paste on the cement paste permeability meter, recording the response time of the self-healing material and the healing time of cement paste microcracks.

[0013] In general, although a variety of analytical methods have been established to analyze the self-healing ability of cementing stone, these methods have many defects, such as:

[0014] (1) The existing technologies mostly analyze the self-healing ability of a single-layer cement sheath or a single cement paste. However, in actual applications, a single-layer cement sheath or a single cement paste is not used alone, resulting in unreliable analysis results.

[0015] (2) The existing cement paste self-healing analysis methods all rely on the changes in parameters such as gas flow, permeability, conductivity, and mechanical properties to characterize the cement paste self-healing rate. The changes in the above parameters can only describe the cement paste self-healing effect superficially. The parameters are limited. Although the existing CT scanning method takes into account all the pores and microcracks changes inside the cement paste, it still lacks the analysis of the volume changes of the internal micro-annuli and micro-cracks during the cement paste self-healing process. Summary of the invention

[0016] The embodiment of the present invention also provides a cementing cement self-healing ability analysis device, which is used to analyze the cement self-healing ability of cement in combination with the cement structure in actual application, and analyze the apparent characteristics of cement self-healing and the volume changes of internal micro-annuli and micro-cracks, so as to improve the reliability and rationality of the cement self-healing ability analysis results. The device includes: a cement ring maintenance and cracking module, a CT scanning module, a data processing module, a simulated casing internal pressure pressurization system, a crude oil pressure pump, and a gas bottle; wherein,

[0017] The cement ring maintenance and joint making module is provided with an inner layer simulated cement ring and an outer layer simulated cement ring;

[0018] The simulated casing internal pressure pressurization system cooperates with the gas bottle to perform seam treatment on the inner layer simulated cement ring and the outer layer simulated cement ring;

[0019] The crude oil pressure pump and the gas bottle are used to perform self-healing maintenance tests on the inner layer simulated cement ring and the outer layer simulated cement ring after the seam treatment;

[0020] A CT scanning module is used to perform non-destructive scanning of the inner layer simulated cement ring and the outer layer simulated cement ring during the self-healing curing test of the inner layer simulated cement ring and the outer layer simulated cement ring, and transmit the scanning data to the data processing module;

[0021] The data processing module is used to collect flow data of the inner layer simulated cement sheath and the outer layer simulated cement sheath during the self-healing maintenance test, and to perform three-dimensional reconstruction according to the scanning data sent by the CT scanning module, and to determine the self-healing ability analysis result of the cementing cement stone according to the three-dimensional reconstruction result and the flow data; the flow data is the flow data of the gas or crude oil that passes into one end of the inner layer simulated cement sheath and the outer layer simulated cement sheath and then flows out of the other end of the inner layer simulated cement sheath and the outer layer simulated cement sheath.

[0022] The embodiment of the present invention provides a cementing cement self-healing ability analysis method, which is used to analyze the cement self-healing ability of cement in combination with the cement structure in practical applications, and simultaneously analyze the apparent characteristics of cement self-healing and the volume changes of internal micro-annuli and micro-cracks, so as to improve the reliability and rationality of the cement self-healing ability analysis results. The method uses the cementing cement self-healing ability analysis device in the embodiment of the present invention, and the method includes:

[0023] After the inner layer simulated cement ring and the outer layer simulated cement ring have been cured for a preset number of days, the inner layer simulated cement ring and the outer layer simulated cement ring are subjected to cracking treatment using the simulated casing internal pressure pressurization system and the gas bottle to obtain the inner layer simulated cement ring and the outer layer simulated cement ring with micro-annular gaps and micro-cracks;

[0024] A crude oil pressure pump and a gas bottle were used to conduct self-healing maintenance tests on the inner layer simulated cement sheath and the outer layer simulated cement sheath with micro-annular gaps and micro-cracks. During the self-healing maintenance test, the CT scanning module was used to collect image data of the inner layer simulated cement sheath and the outer layer simulated cement sheath, and the flow data of the inner layer simulated cement sheath and the outer layer simulated cement sheath during the self-healing maintenance test was counted.

[0025] After the self-healing curing test is completed, the image data is used to perform three-dimensional reconstruction to obtain cement ring three-dimensional reconstruction result data;

[0026] Determine the self-healing ability analysis result of the first cementing cement stone according to the flow rate data during the self-healing maintenance test of the inner layer simulated cement sheath and the outer layer simulated cement sheath;

[0027] According to the cement sheath 3D reconstruction result data, the analysis result of the self-healing ability of the second cementing cement stone is determined;

[0028] The self-healing ability analysis result of the cementing cement is determined according to the first self-healing ability analysis result of the cementing cement and the second self-healing ability analysis result of the cementing cement.

[0029] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for analyzing the self-healing ability of cementing stone when executing the computer program.

[0030] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned method for analyzing the self-healing ability of cementing stone is implemented.

[0031] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned method for analyzing the self-healing ability of cementing stone is implemented.

[0032] The embodiment of the present invention provides a cementing cement self-healing ability analysis device, which mainly includes: a cement ring maintenance and slit making module, a CT scanning module, a data processing module, a simulated casing internal pressure pressurization system, a crude oil pressure pump, and a gas bottle. The structure of the cement ring maintenance and slit making module is combined with the cement stone structure in actual application, and a double-layer cement ring is arranged inside: an inner layer simulated cement ring and an outer layer simulated cement ring. The self-healing ability of a single-layer cement ring can be analyzed, and the self-healing ability of a multi-layer cement ring can also be analyzed. At the same time, the CT scanning module scans the cement ring image data in the self-healing maintenance test, and uses the image data to perform Three-dimensional reconstruction. According to the results of three-dimensional reconstruction, the volumes of effective micro-annuli and micro-cracks inside the cement sheath at different periods can be determined. Combined with the statistical flow data of gas or crude oil entering one end of the inner layer simulated cement sheath and the outer layer simulated cement sheath and then flowing out of the other end of the inner layer simulated cement sheath and the outer layer simulated cement sheath, the volume changes of the internal micro-annuli and micro-cracks and the apparent characteristics of cement stone self-healing are analyzed at the same time, and the real self-healing response rate of the self-healing agent and the self-healing rate of the cement sheath are calculated. Finally, the self-healing ability analysis results of cementing cement stone are given, which improves the reliability and rationality of the self-healing ability analysis results of cementing cement stone.

[0033] A method for analyzing the self-healing ability of cementing stone is provided in an embodiment of the present invention, comprising: based on the self-healing ability analyzing device of cementing stone in the embodiment of the present invention, after the inner layer simulated cement ring and the outer layer simulated cement ring are cured for a preset number of days, the inner layer simulated cement ring and the outer layer simulated cement ring are subjected to a seam-making treatment, and then the inner layer simulated cement ring and the outer layer simulated cement ring with micro-annular gaps and micro-cracks are subjected to a self-healing maintenance test, during the self-healing maintenance test, the image data of the inner layer simulated cement ring and the outer layer simulated cement ring are collected by using a CT scanning module, and the flow data of the outer layer simulated cement ring and the inner layer simulated cement ring during the self-healing maintenance test are counted, and the self-healing ability of cementing stone is analyzed based on the image data and the flow data. The embodiment of the present invention determines the first cementing cement self-healing ability analysis result by continuously counting the flow data of the gas and liquid outlet holes at the end of the cement ring at different times during the self-healing process, and simultaneously performs three-dimensional reconstruction on the image data collected by the CT scanning module to determine the second cementing cement self-healing ability analysis result. Finally, the first cementing cement self-healing ability analysis result and the second cementing cement self-healing ability analysis result are combined to achieve simultaneous analysis of the volume changes of internal micro-annuli and micro-cracks and the apparent characteristics of cement self-healing, calculate the true self-healing response rate of the self-healing agent and the cement ring self-healing rate, and finally give the cement self-healing ability analysis result of the cement, thereby improving the reliability and rationality of the cement self-healing ability analysis result of the cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 Schematic diagram of a device for analyzing the self-healing ability of cementing stone in an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of a cement ring maintenance and cracking module in a cement stone self-healing ability analysis device in an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the process of analyzing the self-healing ability of cementing stone in an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0040] The applicant found that although a variety of analysis methods have been established to analyze the self-healing ability of cement stone, these methods have many defects, such as the lack of analysis of the volume changes of internal micro-annuli and micro-cracks during the self-healing process of cement stone, unreliable analysis results, etc. For this reason, the applicant proposed a device and method for analyzing the self-healing ability of cement stone.

[0041] Figure 1 Schematic diagram of a self-healing ability analysis device for cementing stone in an embodiment of the present invention. Figure 1 As shown, the device comprises: a cement ring maintenance and seam making module (1), a CT scanning module (2), a data processing module (3), a simulated casing internal pressure pressurization system (4), a crude oil pressurization pump (5), and a gas bottle (6); wherein,

[0042] The cement ring curing and seam-making module (1) is provided with an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18);

[0043] The simulated casing internal pressure pressurizing system (4) cooperates with the gas bottle (6) to perform seam-making processing on the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18);

[0044] The crude oil pressure pump (5) cooperates with the gas bottle (6) to perform a self-healing maintenance test on the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) after the seam-making treatment;

[0045] A CT scanning module (2) is used to perform non-destructive scanning on the outer layer simulated cement ring (18) and the inner layer simulated cement ring (16) during the self-healing maintenance test of the outer layer simulated cement ring (18) and the inner layer simulated cement ring (16), and transmit the scanned data to the data processing module;

[0046] The data processing module (3) is used to collect flow data of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) during the self-healing maintenance test, and to perform three-dimensional reconstruction based on the scanning data sent by the CT scanning module (2), and to determine the self-healing ability analysis result of the cementing cement according to the three-dimensional reconstruction result and the flow data; the flow data is the flow data of the gas or crude oil that enters one end of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) and then flows out of the other end of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16).

[0047] Combination Figure 1 The device shown is a cementing cement self-healing ability analysis device in an embodiment of the present invention, which mainly comprises: a cement ring maintenance and seam making module (1), a CT scanning module (2), a data processing module (3), a simulated casing internal pressure pressurization system (4), a crude oil pressure pump (5), and a gas bottle (6). The structure of the cement ring maintenance and seam making module (1) is combined with the cement stone structure in actual application, and a double-layer cement ring is arranged inside: an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18). The self-healing ability of a single-layer cement ring can be analyzed, and the self-healing ability of a multi-layer cement ring can also be analyzed. At the same time, the CT scanning module (2) scans the cement ring image data in the self-healing maintenance test, and uses The image data is used for three-dimensional reconstruction. According to the three-dimensional reconstruction results, the effective micro-annulus and micro-crack volumes inside the cement sheath at different periods can be determined. Combined with the statistical flow data of gas or crude oil entering one end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) and then flowing out of the other end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18), the volume changes of the internal micro-annulus and micro-cracks and the apparent characteristics of cement stone self-healing are analyzed at the same time, the real self-healing response rate of the self-healing agent and the cement sheath self-healing rate are calculated, and finally the self-healing ability analysis results of cementing cement are given, thereby improving the reliability and rationality of the self-healing ability analysis results of cementing cement.

[0048] The following is a detailed introduction to the device and method for analyzing the self-healing ability of cementing stone in the embodiments of the present invention.

[0049] Figure 2 FIG. 1 is a schematic diagram of a cement ring maintenance and cracking module in a cement stone self-healing ability analysis device according to an embodiment of the present invention. Figure 2 As shown, the cement ring curing and seaming module (1) may also include: an outer kettle body (11), a kettle cover (12), a simulated wellbore lower end cover (13), a central positioning shaft (14), an inner layer simulated casing (15), an outer layer simulated casing (17), simulated surrounding rock (19) and a heating resistance wire (111), a cement ring end gas and liquid inlet hole (115), a cement ring end gas and liquid outlet hole (116), and a cement ring end gas and liquid flow meter (119); wherein,

[0050] The outer kettle body (11) and the kettle cover (12) are connected by threads and metal cone seals to form a closed cavity. The kettle cover (12) is both a sealing end cover of the outer kettle body and an upper end cover of the simulated wellbore.

[0051] The kettle cover (12) and the lower end cover (13) of the simulated wellbore are hollowed out and matched with the central positioning shaft (14). The kettle cover (12), the lower end cover (13) of the simulated wellbore, the central positioning shaft (14), and the inner layer simulated casing (15) form a closed space, and the closed space simulates the internal pressure cavity of the casing;

[0052] The outer layers of the inner simulated casing (15) are sequentially inner simulated cement sheath (16), outer simulated casing (17), outer simulated cement sheath (18), and simulated surrounding rock (19). Figure 2 , the annular space between the inner simulated casing (15) and the outer simulated casing (17) is the inner simulated cement ring (16), and the annular space between the outer simulated casing (17) and the simulated surrounding rock (19) is the outer simulated cement ring (18);

[0053] The kettle cover (12) is provided with a cement ring end gas and liquid inlet hole (115) and a cement ring end gas and liquid outlet hole (116), and a cement ring end gas and liquid outlet flowmeter (119) is connected to the cement ring end gas and liquid outlet hole (116) outside the outer kettle body (11);

[0054] The heating resistance wire (111) is arranged on the outer layer of the outer kettle body (11), and the heating resistance wire (111) can be designed in the form of a heating sleeve and sleeved on the outer layer of the outer kettle body (11).

[0055] In one embodiment, the cement ring curing and seam forming module (1) may further include: an internal temperature sensor (120) and an external temperature sensor (112); wherein the internal temperature sensor (120) is arranged on the central positioning shaft (14), and the external temperature sensor (112) is arranged on the outer layer of the outer kettle body (11). During the cement ring curing and self-healing experimental test, the temperature is adjusted by the heating resistance wire (111) according to actual needs, and the internal and external temperatures of the cementing cement self-healing ability analysis device are detected in real time by the internal temperature sensor (120) and the external temperature sensor (112), which helps to improve the reliability and accuracy of the cementing cement self-healing ability analysis.

[0056] In one embodiment, the upper temperature limit of all components in the cement ring maintenance and seam making module (1) reaches 260°C, and the upper pressure limit reaches 200Mpa. For example, the upper temperature limit of the external temperature sensor (112) and the upper pressure limit of the internal temperature sensor (120) reach 260°C, and the upper pressure limit reaches 200MPa. It should be noted that the difference between the temperature and pressure of the simulation experiment and the actual situation is often ignored in the prior art, while the high temperature and high pressure of the actual operation are fully considered in this example. All components in the cement ring maintenance and seam making module (1) are high temperature resistant and high pressure resistant devices, which improves the reliability and rationality of the simulation of cement ring seam making and cement stone self-healing ability analysis.

[0057] In one embodiment, the kettle cover (12) is also provided with a confining pressure pressurization hole (117), a confining pressure exhaust hole (118) and an internal pressure exhaust hole (114); the central positioning shaft (14) is provided with an internal pressure pressurization hole (113) and an internal pressure exhaust hole (114); and a cement ring end gas inlet and liquid hole (115) is provided on the lower end cover (13) of the simulated wellbore. By providing pressurization holes and exhaust holes at multiple locations, cement ring maintenance and seam making are more practical.

[0058] In one embodiment, a support (110) is provided at the bottom of the outer kettle (11), so that the cementing cement stone curing and self-healing can be carried out stably.

[0059] In one embodiment, the simulated surrounding rock (19) uses steel pipes of different thicknesses, and simulates surrounding rocks of different properties by changing the thickness. It should be noted that the prior art often ignores the difference between the properties of the surrounding rocks in the simulation experiment and the actual situation. In this example, the simulated surrounding rock (19) is set to use steel pipes of different thicknesses to simulate surrounding rocks of different properties, thereby improving the reliability and rationality of the simulated cement ring cracking and cement stone self-healing ability analysis.

[0060] In one embodiment, the geometric dimensions of the inner simulated cement sheath (16) and the outer simulated cement sheath (18) are determined by scaling according to the actual wellbore geometric dimensions.

[0061] The relationship between the simulated cement ring of this device and the actual wellbore cement ring is as follows:

[0062]

[0063] Where: r 1模拟 is the inner radius of the simulated cement sheath, mm;

[0064] r 2模拟 is the outer radius of the simulated cement ring, mm;

[0065] r 1实际 is the actual wellbore cement ring inner radius, mm;

[0066] r 2实际 is the actual outer radius of the wellbore cement ring, mm.

[0067] Taking 215.9 mm as the original wellbore size of the actual wellbore as an example, the actual wellbore size under different wellbore expansion rates and the simulated cement sheath size after reduction based on a similarity ratio of 0.35 are shown in Tables 1 and 2. Table 1 is an illustration of the actual wellbore cement sheath size, and Table 2 is an illustration of the simulated cement sheath size after reduction based on a similarity ratio of 0.35.

[0068] Table 1 Actual wellbore cement sheath dimensions

[0069]

[0070] Table 2 Schematic diagram of simulated cement sheath size after reduction by similar ratio of 0.35

[0071]

[0072] This example fully considers the service environment and space environment of the real underground cementing cement sheath in actual situations, and further improves the reliability and rationality of the simulation of cement sheath fracture formation and cement stone self-healing ability analysis.

[0073] In one embodiment, reference Figure 1 The cementing cement self-healing ability analysis device may also include a plurality of pressure gauges (7), a plurality of fluid flow meters (8), and a four-way valve (9); wherein the pressure gauge (7) is used to test the pressure of the gas or liquid input into the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18), and the fluid flow meter (8) is used to test the flow of the gas or liquid input into the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18).

[0074] In one embodiment, the gas cylinder (6) is a natural gas cylinder or a nitrogen cylinder, and the natural gas cylinder or the nitrogen cylinder can be replaced according to actual test requirements.

[0075] Furthermore, the data processing module (3) performs three-dimensional reconstruction on the scan data sent by the CT scanning module (2) through a pre-set program. Specifically, it performs three-dimensional reconstruction on various pores and microcracks inside the cement sheath, and finally obtains the volume of invalid pores and microcracks inside the cement sheath and the volume of effective micro-annular gaps and microcracks of the cement sheath at any time.

[0076] At the same time, the data processing module (3) obtains the flow data of the outer layer simulated cement ring (18) and the inner layer simulated cement ring (16) during the self-healing maintenance test through a pre-set program, and calculates the apparent self-healing response rate of the self-healing agent and the apparent cement ring self-healing rate based on the flow data.

[0077] Finally, the data processing module (3) combines the three-dimensional reconstruction results and the flow data calculation results to output the final analysis results of the self-healing ability of cementing stone.

[0078] It should be noted that all components of the self-healing ability analysis device for cementing stone in the embodiment of the present invention are disassembled and replaceable.

[0079] The embodiment of the present invention also provides a method for analyzing the self-healing ability of cementing stone, which is applied to the device for analyzing the self-healing ability of cementing stone in the embodiment of the present invention. Figure 3 FIG. 1 is a flow chart of a method for analyzing the self-healing ability of cementing stone in an embodiment of the present invention. Figure 3 As shown, the method includes:

[0080] Step 301: Based on the cement self-healing ability analysis device, after the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are cured for a preset number of days, the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are subjected to cracking treatment using a simulated casing internal pressure pressurization system (4) and a gas bottle (6), so as to obtain an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks;

[0081] Step 302: using a crude oil pressure pump (5) and a gas bottle (6) to perform a self-healing maintenance test on the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) with micro-annular gaps and micro-cracks. During the self-healing maintenance test, using a CT scanning module (2) to collect image data of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18), and at the same time, statistically analyzing the flow data of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) during the self-healing maintenance test.

[0082] Step 303: after the self-healing curing test is completed, the image data is used to perform three-dimensional reconstruction to obtain three-dimensional reconstruction result data of the cement ring;

[0083] Step 304, determining the self-healing ability analysis result of the first cementing cement according to the flow data during the self-healing maintenance test of the outer layer simulated cement ring (18) and the inner layer simulated cement ring (16);

[0084] Step 305: Determine the self-healing ability analysis result of the second cementing cement according to the three-dimensional reconstruction result data of the cement sheath;

[0085] Step 306: Determine a cementing cement self-healing ability analysis result according to the first cementing cement self-healing ability analysis result and the second cementing cement self-healing ability analysis result.

[0086] from Figure 3As can be seen from the flow chart, the method for analyzing the self-healing ability of cementing stone in the embodiment of the present invention comprises: based on the self-healing ability analyzing device for cementing stone in the embodiment of the present invention, after the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are cured for a preset number of days, the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are subjected to cracking treatment, and then the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks are subjected to self-healing curing test, and during the self-healing curing test, the image data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are collected by using the CT scanning module (2), and the flow data of the outer layer simulated cement ring (18) and the inner layer simulated cement ring (16) during the self-healing curing test are counted, and the self-healing ability analysis of cementing stone is performed based on the image data and the flow data. The embodiment of the present invention determines a first cementing cement self-healing ability analysis result by continuously counting flow data of the gas and liquid outlet hole (116) at the end of the cement ring at different moments during the self-healing process, and simultaneously performs three-dimensional reconstruction on image data collected by a CT scanning module to determine a second cementing cement self-healing ability analysis result. Finally, the first cementing cement self-healing ability analysis result and the second cementing cement self-healing ability analysis result are combined to achieve simultaneous analysis of the volume changes of internal micro-annuli and micro-cracks and the apparent characteristics of cement self-healing, calculate the true self-healing response rate of the self-healing agent and the cement ring self-healing rate, and finally give a cementing cement self-healing ability analysis result, thereby improving the reliability and rationality of the cementing cement self-healing ability analysis result.

[0087] The following is a detailed explanation of the self-healing ability analysis method of cementing stone in an embodiment of the present invention.

[0088] The first step is curing. The curing temperature is adjusted by a heating sleeve formed by a heating resistor wire (111) and a temperature control system formed by an inner temperature sensor (120) and an outer temperature sensor (112), and the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are cured to a set age. The set age can be set to 1 day, 3 days, 7 days, 15 days, 30 days, etc. according to experimental requirements.

[0089] The second step is to create seams. The inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are processed with seams by using the simulated casing internal pressure pressurization system (4) and the gas bottle (6) to obtain the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks.

[0090] Specifically, the gas inlet and liquid hole (115) at the end of the cement ring is opened, and 2-5 MPa nitrogen is introduced through a gas bottle (6) (in this case, a nitrogen bottle), and the hydraulic pressure is increased in the casing through a simulated casing internal pressure pressurization system (4), specifically, experimental oil is filled, and the pressurization rate is controlled at 0.5 MPa-5 MPa / min as needed, until a preset nitrogen flow rate is detected at the gas outlet and liquid hole (116) at the end of the cement ring. After maintaining the pressure for a first preset time, for example, 10 minutes, the pressure is released through the internal pressure exhaust hole 114. At this time, the seam creation is completed, and an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks are obtained.

[0091] Step 3: Self-healing maintenance and testing.

[0092] The embodiments of the present invention provide static self-healing maintenance and testing, and dynamic self-healing maintenance and testing.

[0093] Static self-healing maintenance and testing:

[0094] After the pressure relief is completed, the flow rate of the natural gas or crude oil at the gas and liquid outlet hole (116) at the end of the cement ring is recorded as the flow rate of the natural gas or crude oil at the gas and liquid outlet hole (116) at the end of the cement ring at the initial time (t0);

[0095] Then, using a natural gas bottle or a crude oil pressure pump (5), natural gas or crude oil at a first preset pressure (for example, between 0.1 and 5 MPa) is injected into the closed cavity of the cement ring curing and seaming module (1), and after maintaining the first preset time (for example, 1 to 5 minutes), the gas outlet hole (116) at the end of the cement ring is first closed, and then the gas inlet hole (115) at the end of the cement ring is closed to ensure that the natural gas or crude oil at the corresponding pressure is sealed in the simulated cement ring, and the cement ring is cured at a preset temperature and pressure for a third preset time (for example, any time of 4 to 24 hours);

[0096] Afterwards, the gas-liquid inlet hole (115) and the gas-liquid outlet hole (116) at the end of the cement ring are opened in sequence, so that natural gas or crude oil of the same pressure can flow into the simulated cement ring, and the flow rate of the natural gas or crude oil at the gas-liquid outlet hole (116) at the end of the cement ring at any time point (t1) is recorded.

[0097] Dynamic self-healing maintenance and testing:

[0098] After the pressure relief is completed, the flow rate of the natural gas or crude oil at the gas and liquid outlet hole (116) at the end of the cement ring is recorded as the flow rate of the natural gas or crude oil at the gas and liquid outlet hole (116) at the end of the cement ring at the initial time (t0);

[0099] Then, a natural gas bottle or a crude oil pressure pump (5) is used to inject natural gas or crude oil of a first preset pressure (for example, between 0.1 and 5 MPa) into the closed cavity in the cement ring curing and seaming module (1), and the natural gas or crude oil of the corresponding pressure is kept sealed in the simulated cement ring. The gas inlet and liquid hole (115) at the end of the cement ring and the gas outlet and liquid hole (116) at the end of the cement ring are continuously opened. The cement ring is cured at a preset temperature and pressure for a third preset time (for example, any time of 4 to 24 hours), and the flow rate of the natural gas or crude oil at the gas outlet and liquid hole (116) at the end of the cement ring at any time point (t1) is recorded.

[0100] Step 4: During the process of step 3, the image data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are continuously collected by using the CT scanning module (2). When the self-healing maintenance is completed, the statistical flow data and image data are obtained at the same time. Afterwards, the final self-healing ability analysis result of the cementing cement is obtained based on the flow data and the image data. The self-healing ability analysis result of the cementing cement may include the self-healing response rate of the self-healing agent, the self-healing rate of the cement ring, and the quantitative level of the self-healing effect of the cementing cement.

[0101] Step 5: Determine the self-healing ability analysis result of the first cementing cement according to the flow rate data during the self-healing maintenance test of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18).

[0102] According to the flow data during the self-healing curing test of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18), the self-healing response rate of the self-healing agent is calculated according to the following formula, which is recorded as the apparent self-healing response rate of the self-healing agent:

[0103]

[0104] In the formula, α 表观 (t) is the apparent self-healing response rate of the self-healing agent, 10 -3 min -1 ;

[0105] is the flow rate of the gas and liquid outlet hole (116) at the end of the cement ring at the initial time (time t0), mL / min;

[0106] is the flow rate of the gas and liquid outlet hole (116) at the end of the cement sheath at time t1 (a certain time during the test), mL / min;

[0107] is the flow rate of the gas and liquid outlet hole (116) at the end of the cement sheath at time t2 (a time other than time t1 during the test), mL / min.

[0108] According to the apparent self-healing response rate of the self-healing agent, the cement sheath self-healing rate is calculated according to the following formula, which is recorded as the apparent cement sheath self-healing rate:

[0109]

[0110] Where η 表观 is the self-healing rate of cement sheath, dimensionless (%);

[0111] t0 is the initial time when the flow rate appears at the gas and liquid outlet hole (116) at the end of the cement ring, min;

[0112] t 终 It is the termination time of the self-healing test of cement sheath when encountering oil or gas, min.

[0113] Step 6: Perform three-dimensional reconstruction using the image data to obtain three-dimensional reconstruction result data of the cement ring, and determine the analysis result of the self-healing ability of the second cementing cement stone based on the three-dimensional reconstruction result data of the cement ring.

[0114] In the specific implementation, the image data is used for three-dimensional reconstruction to obtain the three-dimensional reconstruction result data of the cement sheath. According to the three-dimensional reconstruction result data of the cement sheath, the total pores and microcracks volume inside the cement sheath at any time (including t0, t1, t2, etc.) are determined. According to the total pores and microcracks volume inside the cement sheath, the self-healing response rate of the self-healing agent is calculated according to the following formula, which is recorded as the true self-healing response rate of the self-healing agent:

[0115]

[0116] In the formula, is the total pore and microcrack volume inside the cement sheath at the initial time (t0), cm 3 ;

[0117] is the total pore and microcrack volume inside the cement sheath at time t1 (a certain moment during the test), cm 3 ;

[0118] is the total pore and microcrack volume inside the cement sheath at time t2 (except time t1 during the test), cm 3 ;

[0119] V 无效 is the volume of invalid pores and microcracks inside the cement sheath, cm 3 .

[0120] In this case, the influence of the invalid pores and microcracks inside the cement sheath that cannot form natural gas flow channels on the self-healing effect of cement paste was effectively avoided.

[0121] According to the self-healing response rate of the real self-healing agent, the cement sheath self-healing rate is calculated according to the following formula, which is recorded as the real cement sheath self-healing rate:

[0122]

[0123] Where η 真实 is the self-healing rate of cement sheath, dimensionless (%);

[0124] t0 is the initial time when the flow rate appears at the gas and liquid outlet hole (116) at the end of the cement ring, min;

[0125] t 终 It is the termination time of the self-healing evaluation experiment of cement sheath encountering oil or gas, min.

[0126] Step 7: Determine the self-healing ability analysis result of the cementing cement according to the first self-healing ability analysis result of the cementing cement and the second self-healing ability analysis result of the cementing cement.

[0127] Finally, the apparent self-healing agent self-healing response rate and the apparent cement ring self-healing rate in the first cementing cement stone self-healing ability analysis result, and the real self-healing agent self-healing response rate and the real cement ring self-healing rate in the second cementing cement stone self-healing ability analysis result are comprehensively analyzed to compare the results. For the parts with more deviations, re-tests are carried out. When the overall trends of the first cementing cement stone self-healing ability analysis results and the second cementing cement stone self-healing ability analysis results are consistent, the cementing cement stone self-healing ability analysis results can be determined according to the first cementing cement stone self-healing ability analysis results and the second cementing cement stone self-healing ability analysis results.

[0128] Table 3 is a quantitative analysis and evaluation table of the self-healing response rate of the self-healing agent.

[0129] Table 3 Quantitative analysis and evaluation table of self-healing response rate of self-healing agent

[0130] <![CDATA[Self-healing response rate α / (10 -3 min -1 )]]> Self-healing response effect 1.250-1.389 Very fast 1.111-1.250 quick 0.972-1.111 Faster 0.833-0.972 generally 0.556-0.833 Slow 0.278-0.556 slow 0.000-0.278 Very slow

[0131] Table 4 is a quantitative analysis and evaluation table of the self-healing effect of cement paste.

[0132] Table 4 Quantitative analysis and evaluation table of cement paste self-healing effect

[0133] Cement paste self-healing rate / (%) Self-healing effect of cement stone 0-30 Poor 30-60 generally 60-80 better 80-90 good 90-100 excellent

[0134] In summary, compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0135] (1) The embodiment of the present invention follows the principle of geometric similarity between the size of the simulated cement ring in the simulated wellbore and the size of the cement ring in the actual wellbore (casing-cement ring-wellbore surrounding rock combination), and uses steel pipes of different wall thicknesses to simulate surrounding rocks of different properties, thereby improving the reliability and rationality of cement ring slitting, and then realizing a maintenance-slitting-testing-analysis integrated design that is closer to the actual downhole cementing cement ring service environment.

[0136] (2) The cement self-healing ability analysis device of the embodiment of the present invention meets the actual high temperature and high pressure conditions of deep natural gas wells. The upper temperature limit of all components in the cement ring maintenance and seam making module (1) reaches 260°C, and the upper pressure limit reaches 200MPa.

[0137] (3) The self-healing ability analysis device for cementing cement according to the embodiment of the present invention can analyze the self-healing ability of both single-layer cement sheath and multi-layer cement sheath, thereby improving the analysis capability of simulating complex structures of cement sheath.

[0138] (4) The embodiment of the present invention combines the CT scanning method with the three-dimensional reconstruction image processing technology to characterize the volume changes of effective micro-annulus and micro-cracks (through micro-cracks and micro-gaps that can provide channels for natural gas to flow) during the self-healing process of the cement sheath, and provides a method for calculating the self-healing response rate of the real self-healing agent and the real cement sheath self-healing rate. This method can effectively avoid the influence of the volume of invalid pores and micro-cracks inside the cement sheath that cannot form natural gas circulation channels on the self-healing effect of cement stone.

[0139] (5) The embodiment of the present invention combines the analysis results of the self-healing ability of cementing stone using flow data and the analysis results using three-dimensional reconstruction technology, making the analysis results of the self-healing ability of cementing stone more reliable.

[0140] Figure 4 Schematic diagram of a computer device in an embodiment of the present invention. Figure 4 As shown, an embodiment of the present invention further provides a computer device 400, including a processor 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401, wherein the processor 401 implements the above-mentioned cementing cement self-healing ability analysis method when executing the computer program 403.

[0141] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned method for analyzing the self-healing ability of cementing stone is implemented.

[0142] An embodiment of the present invention further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the above-mentioned method for analyzing the self-healing ability of cementing stone is implemented.

[0143] The embodiment of the present invention provides a cementing cement self-healing ability analysis device, which mainly comprises: a cement ring maintenance and seam making module (1), a CT scanning module (2), a data processing module (3), a simulated casing internal pressure pressurization system (4), a crude oil pressurization pump (5), and a gas bottle (6). The structure of the cement ring maintenance and seam making module (1) is combined with the cement stone structure in actual application, and a double-layer cement ring is arranged inside: an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18). The self-healing ability of a single-layer cement ring can be analyzed, and the self-healing ability of a multi-layer cement ring can also be analyzed. At the same time, the CT scanning module (2) scans the cement ring image data in the self-healing maintenance test, and uses The image data is used for three-dimensional reconstruction. According to the three-dimensional reconstruction results, the effective micro-annulus and micro-crack volumes inside the cement sheath at different periods can be determined. Combined with the statistical flow data of gas or crude oil entering one end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) and then flowing out of the other end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18), the volume changes of the internal micro-annulus and micro-cracks and the apparent characteristics of cement stone self-healing are analyzed at the same time, the real self-healing response rate of the self-healing agent and the cement sheath self-healing rate are calculated, and finally the self-healing ability analysis results of cementing cement are given, thereby improving the reliability and rationality of the self-healing ability analysis results of cementing cement.

[0144] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0145] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0146] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0147] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0148] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for analyzing the self-healing ability of cementing stone, characterized in that: include: Cement ring maintenance joint making module (1), CT scanning module (2), data processing module (3), simulated casing internal pressure pressurization system (4), crude oil pressurization pump (5), gas bottle (6); wherein, The cement ring curing and seam-making module (1) is provided with an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18); The simulated casing internal pressure pressurizing system (4) cooperates with the gas bottle (6) to perform seam-making processing on the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18); The crude oil pressure pump (5) cooperates with the gas bottle (6) to perform a self-healing maintenance test on the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) after the seam-making treatment; A CT scanning module (2) is used to perform non-destructive scanning on the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) during the self-healing maintenance test of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18), and transmit the scanned data to the data processing module (3); The data processing module (3) is used to collect flow data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) during the self-healing maintenance test, and to perform three-dimensional reconstruction based on the scanning data sent by the CT scanning module (2), and to determine the self-healing ability analysis result of the cementing cement according to the three-dimensional reconstruction result and the flow data; the flow data is the flow data of gas or crude oil that enters one end of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) and then flows out of the other end of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18).

2. The device according to claim 1, characterized in that The cement ring maintenance and seam making module (1) further comprises: an outer kettle body (11), a kettle cover (12), a simulated wellbore lower end cover (13), a central positioning shaft (14), an inner layer simulated casing (15), an outer layer simulated casing (17), simulated surrounding rock (19), a heating resistance wire (111), a cement ring end gas and liquid inlet hole (115), a cement ring end gas and liquid outlet hole (116), and a cement ring end gas and liquid outlet flowmeter (119); wherein, The outer kettle body (11) and the kettle cover (12) are connected by threads and metal cone seals to form a closed cavity; The kettle cover (12) and the lower end cover (13) of the simulated wellbore are hollowed out and matched with the central positioning shaft (14); the kettle cover (12), the lower end cover (13) of the simulated wellbore, the central positioning shaft (14), and the inner layer simulated casing (15) form a closed space; the outer layer of the inner layer simulated casing (15) is sequentially composed of an inner layer simulated cement ring (16), an outer layer simulated casing (17), an outer layer simulated cement ring (18), and simulated surrounding rock (19); The kettle cover (12) is provided with a cement ring end gas and liquid inlet hole (115) and a cement ring end gas and liquid outlet hole (116), and a cement ring end gas and liquid outlet flowmeter (119) is connected to the cement ring end gas and liquid outlet hole (116) outside the outer kettle body (11); The heating resistance wire (111) is arranged on the outer layer of the outer kettle body (11).

3. The device according to claim 2, characterized in that The cement ring curing and seam-making module (1) further comprises: an internal temperature sensor (120) and an external temperature sensor (112); wherein the internal temperature sensor (120) is arranged on the central positioning shaft (14), and the external temperature sensor (112) is arranged on the outer layer of the outer kettle body (11).

4. The device according to claim 3, characterized in that The upper temperature limits of the external temperature sensor (112) and the internal temperature sensor (120) both reach 260°C, and the upper pressure limits both reach 200 MPa.

5. The device according to claim 2, characterized in that The kettle cover (12) is also provided with a confining pressure pressurizing hole (117), a confining pressure exhaust hole (118) and an internal pressure exhaust hole (114); the central positioning shaft (14) is provided with an internal pressure pressurizing hole (113) and an internal pressure exhaust hole (114); and the lower end cover (13) of the simulated wellbore is provided with a cement ring end gas and liquid inlet hole (115).

6. The device according to claim 2, characterized in that A support (110) is provided at the bottom of the outer kettle body (11).

7. The device according to claim 2, characterized in that The simulated surrounding rock (19) is made of steel pipes with different thicknesses.

8. The device according to claim 2, characterized in that The geometric dimensions of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are determined by scaling in proportion to the actual wellbore geometric dimensions.

9. The device according to claim 2, characterized in that The device further comprises a plurality of pressure gauges (7), a plurality of fluid flow meters (8), and a cross-connect (9); wherein the pressure gauges (7) are used to test the pressure of the gas or liquid input into the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18), and the fluid flow meters (8) are used to test the flow of the gas or liquid input into the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18).

10. The device according to claim 1, characterized in that The gas cylinder (6) is a natural gas cylinder or a nitrogen cylinder.

11. A method for analyzing the self-healing ability of cementing stone, characterized in that: The self-healing ability analysis device for cementing stone used in any one of claims 1 to 10 comprises: After the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) have been cured for a preset number of days, the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are subjected to cracking treatment using a simulated casing internal pressure pressurization system (4) and a gas bottle (6) to obtain an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks; A self-healing maintenance test is performed on an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks using a crude oil pressure pump (5) and a gas bottle (6). During the self-healing maintenance test, image data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are collected using a CT scanning module (2), and flow data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) during the self-healing maintenance test is simultaneously counted; After the self-healing curing test is completed, the image data is used to perform three-dimensional reconstruction to obtain cement ring three-dimensional reconstruction result data; Determine the self-healing ability analysis result of the first cementing cement according to the flow rate data during the self-healing maintenance test of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18); According to the cement sheath 3D reconstruction result data, the analysis result of the self-healing ability of the second cementing cement stone is determined; The self-healing ability analysis result of the cementing cement is determined according to the first self-healing ability analysis result of the cementing cement and the second self-healing ability analysis result of the cementing cement.

12. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method of claim 11 is implemented.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method of claim 11 is implemented.

14. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to claim 11 is implemented.

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