Self-healing ability analysis method and apparatus for well-cementing cement stone

Abstract

The present invention relates to the technical field of petroleum and natural gas exploration and development. Disclosed are a self-healing ability analysis method and apparatus for a well-cementing cement stone. The apparatus comprises: a cement sheath curing and crack-forming module, a CT scanning module, a data processing module, a simulated sleeve internal pressure pressurizing system, a crude oil pressurizing pump and a gas cylinder, wherein a double-layer simulated cement sheath is provided in the cement sheath curing and crack-forming module; the simulated sleeve internal pressure pressurizing system cooperates with the gas cylinder and is configured to perform crack-forming treatment on the double-layer simulated cement sheath; the crude oil pressurizing pump cooperates with the gas cylinder and is configured to perform a self-healing curing test on the double-layer simulated cement sheath, which has been subjected to the crack-forming treatment; the CT scanning module is configured to perform non-destructive scanning on the double-layer simulated cement sheath during the self-healing curing test of the double-layer simulated cement sheath, and transmit scanning data to the data processing module; and the data processing module is configured to determine a self-healing ability analysis result of a well-cementing cement stone. The present invention can improve the reliability and rationality of a self-healing ability analysis result of a cement stone.

Description

Method and device for analyzing self-healing ability of cement stone Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration and development, and in particular to a method and 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 that are recited in the claims. No statement herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. No statement herein is admitted to be prior art by virtue of its inclusion in this section.

[0004] With the development of natural gas in deeper formations, the problem of annular pressure is becoming increasingly serious. The cement sheath of oil and gas wells may develop micro-gaps or micro-cracks under the action of external forces. If the damage continues to develop, it is likely to lead to serious problems such as cement sheath failure. Common cementing methods used to solve this type of problem include the use of high-mechanical elastic expansion cement slurry and self-healing cement slurry systems 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. However, 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 sheath damage through self-diagnosis and repair technology. After years of development, both domestic and foreign countries have made great progress in the formulation of self-healing cement slurries. However, 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 evaluating the self-healing ability of cement.

[0005] The existing methods for analyzing the self-healing ability of cement stone are:

[0006] (1) Mechanical properties analysis method:

[0007] This method compares and analyzes the self-healing ability of cement paste by testing its mechanical properties (including compressive strength, flexural strength, tensile strength, and bond strength) before failure (or healing) and after healing and curing. The testing method involves curing cement paste specimens under certain conditions for a certain period of time, preparing samples, and testing the compressive, flexural, and tensile strengths of the samples. The damaged samples are then placed in a curing device for continued curing. After a period of curing, the compressive, flexural, and tensile strengths of the samples are then measured again to monitor the recovery of the mechanical properties of the cement samples at different curing times. The ratio of the mechanical property data before and after healing is typically used as the healing index for self-healing cement.

[0008] (2) Acoustic emission method:

[0009] Acoustic emission (AE) is the phenomenon in which a structure deforms or fractures under stress and releases strain energy in the form of elastic waves. It is a dynamic, passive monitoring technology that, unlike ultrasonic technology, requires external energy. It enables true online, real-time monitoring, quickly reflecting the material's damage state and defect location, significantly reducing monitoring time and costs. Based on research results both domestically and internationally, AE technology can effectively monitor the initiation and expansion of concrete cracks and is highly sensitive to internal changes in components. Changes within components before and after concrete healing manifest themselves as macroscopically different AE signals. Cracks that do not expand do not generate AE signals. The presence or absence of AE signals and their characteristic changes can be used to assess the concrete's self-healing effectiveness and damage evolution.

[0010] (3) Conductivity method:

[0011] For example, Chinese patent number CN104502419B discloses a device and method for evaluating the self-healing ability of self-healing cement. This method quantitatively evaluates the self-healing ability of cement by measuring the conductivity of the electrolyte solution in the cement pores and calculating the percentage reduction in the effective cross-sectional area of ​​the pores at the axial center of the cement pores. Furthermore, this method can quantitatively monitor the self-healing process by measuring the conductivity of the electrolyte solution in the pores of cement pores at different ages, reflecting the changes in the cross-sectional area of ​​the cement pores at different curing ages. The self-healing ability K of cement pores is expressed as the percentage reduction in the cross-sectional area of ​​the pores after a time t.

[0012] (4) Permeability / flow rate change analysis method:

[0013] The permeability / flow rate 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 cement paste modules after the experiment and to test the permeability of the cement paste before and after self-healing. The changes in permeability and pore size are used to analyze the self-healing performance of the self-healing cement paste after gas erosion. Mechanical property evaluation methods cannot reflect the flow of formation fluids through microcracks in the cement sheath, while permeability measurement methods can directly reflect the flow of fluids through microcracks in the cement sheath. The use of cement paste permeability to analyze cement sheath healing has gained recognition in the cementing field, but a standardized testing method is still lacking. The main testing process of this method involves curing cement paste specimens under certain conditions, simulating microcracks through varying degrees of damage, and then continuously monitoring the permeability trend of the cement paste using a cement paste permeability meter. The response time of the self-healing material and the healing time of the cement paste microcracks are recorded.

[0014] In general, although a variety of analytical methods have been established to analyze the self-healing ability of cement stone, these methods have many defects, such as:

[0015] (1) Existing technologies mostly analyze the self-healing ability of a single cement sheath or a single cement stone. However, in actual applications, a single cement sheath or a single cement stone is not used alone, resulting in unreliable analysis results.

[0016] (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 changes in pores and microcracks inside the cement paste, it still lacks the analysis of the volume changes of the internal micro-annulus and microcracks during the cement paste self-healing process.

[0017] Summary of the Invention

[0018] The embodiment of the present invention also provides a cementing cement self-healing ability analysis device, which is used to analyze the self-healing ability of cement stone in combination with the cement stone structure in actual application, and simultaneously analyze the apparent characteristics of cement stone self-healing and the volume changes of internal micro-annulus and micro-cracks, thereby improving the reliability and rationality of the cementing 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,

[0019] The cement ring curing and cracking module is equipped with an inner layer simulated cement ring and an outer layer simulated cement ring;

[0020] The simulated casing internal pressure pressurization system is used in conjunction with the gas cylinder to create seams on the inner and outer simulated cement sheaths;

[0021] The crude oil pressure pump is used in conjunction with the gas cylinder to conduct self-healing maintenance tests on the inner and outer simulated cement sheaths after the cracking treatment.

[0022] A CT scanning module is used to perform non-destructive scanning of the inner layer simulated cement sheath and the outer layer simulated cement sheath during the self-healing curing test of the inner layer simulated cement sheath and the outer layer simulated cement sheath, and transmit the scan data to the data processing module;

[0023] A data processing module is configured to collect flow rate data during the self-healing curing test of the inner and outer simulated cement sheaths, perform three-dimensional reconstruction based on the scan data transmitted by the CT scanning module, and determine a result of an analysis of the self-healing ability of the cementing stone based on the three-dimensional reconstruction result and the flow rate data; the flow rate data being the flow rate data of gas or crude oil flowing into one end of the inner and outer simulated cement sheaths and out of the other end of the inner and outer simulated cement sheaths.

[0024] An embodiment of the present invention provides a method for analyzing the self-healing ability of cement stone. The method is used to analyze the self-healing ability of cement stone in combination with the structure of cement stone in actual application, and simultaneously analyzes the apparent characteristics of cement stone self-healing and the volume changes of internal micro-annuli and micro-cracks, thereby improving the reliability and rationality of the self-healing ability analysis results of cement stone. The method uses the self-healing ability analysis device of the embodiment of the present invention, and the method includes:

[0025] After the inner layer simulated cement sheath and the outer layer simulated cement sheath have been cured for a preset number of days, the inner layer simulated cement sheath and the outer layer simulated cement sheath are cracked using the simulated casing internal pressure pressurization system and the gas cylinder to obtain the inner layer simulated cement sheath and the outer layer simulated cement sheath with micro-annular gaps and micro-cracks;

[0026] A crude oil pressure pump and gas cylinder were used to conduct self-healing curing tests on the inner and outer simulated cement sheaths with micro-annular gaps and micro-cracks. During the self-healing curing tests, a CT scanning module was used to collect image data of the inner and outer simulated cement sheaths. Flow rate data during the self-healing curing tests was also collected.

[0027] 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 sheath;

[0028] Determine the self-healing ability analysis results of the first cementing cement stone based on the flow rate data during the self-healing curing test of the inner layer simulated cement sheath and the outer layer simulated cement sheath;

[0029] According to the cement sheath 3D reconstruction result data, the self-healing ability analysis results of the second cementing cement stone are determined;

[0030] The self-healing ability analysis result of the cement stone is determined according to the first self-healing ability analysis result of the cement stone and the second self-healing ability analysis result of the cement stone.

[0031] 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. When the processor executes the computer program, the above-mentioned method for analyzing the self-healing ability of cement stone is implemented.

[0032] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for analyzing the self-healing ability of cement stone is implemented.

[0033] 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 computer program implements the above-mentioned method for analyzing the self-healing ability of cement stone.

[0034] An embodiment of the present invention provides a cementing cement self-healing ability analysis device, which mainly includes: a cement ring maintenance and seam 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 seam making module is combined with the cement stone structure in actual application, and a double-layer cement ring is provided inside: an inner layer simulated cement ring and an outer layer simulated cement ring. It can analyze the self-healing ability of a single-layer cement ring and the self-healing ability of a multi-layer cement ring; 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. Based on 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 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-annulus and micro-cracks and the apparent characteristics of cement stone self-healing are analyzed at the same time, and the true self-healing response rate of the self-healing agent and the cement sheath self-healing rate 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.

[0035] An embodiment of the present invention provides a method for analyzing the self-healing ability of cement stone, comprising: based on the self-healing ability analysis device of the cement stone in the embodiment of the present invention, after the inner layer simulated cement sheath and the outer layer simulated cement sheath are cured for a preset number of days, the inner layer simulated cement sheath and the outer layer simulated cement sheath are subjected to fracture treatment, and then the inner layer simulated cement sheath and the outer layer simulated cement sheath with micro-annular gaps and micro-cracks are subjected to a self-healing maintenance test. During the self-healing maintenance test, image data of the inner layer simulated cement sheath and the outer layer simulated cement sheath are collected using a CT scanning module, and flow data of the outer layer simulated cement sheath and the inner layer simulated cement sheath during the self-healing maintenance test are counted, and the self-healing ability of the cement stone is analyzed based on the image data and the flow data. The embodiment of the present invention determines a first cementing cement stone self-healing ability analysis result by continuously counting the flow data of the gas and liquid outlet holes at the end of the cement sheath at different moments during the self-healing process, and simultaneously determines a second cementing cement stone self-healing ability analysis result by performing three-dimensional reconstruction of the image data collected by the CT scanning module. Finally, the first cementing cement stone self-healing ability analysis result and the second cementing cement stone self-healing ability analysis result are combined to simultaneously analyze the volume changes of the internal micro-annulus and micro-cracks and the apparent characteristics of cement stone self-healing, calculate the true self-healing response rate of the self-healing agent and the cement sheath self-healing rate, and finally give the cement stone self-healing ability analysis result, thereby improving the reliability and rationality of the cement stone self-healing ability analysis result. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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 the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0037] FIG1 is a schematic diagram of a device for analyzing the self-healing ability of cement stone in an embodiment of the present invention;

[0038] FIG2 is a schematic diagram of a cement ring curing and cracking module in a cement stone self-healing ability analysis device according to an embodiment of the present invention;

[0039] FIG3 is a flow chart of a method for analyzing the self-healing ability of cement stone according to an embodiment of the present invention;

[0040] FIG4 is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to 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.

[0042] 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. Therefore, the applicant proposed a device and method for analyzing the self-healing ability of cement stone.

[0043] FIG1 is a schematic diagram of a cementing cement self-healing ability analysis device according to an embodiment of the present invention. As shown in FIG1 , the device comprises: a cement ring curing and cracking 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); wherein,

[0044] The cement ring curing and cracking module (1) is provided with an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18);

[0045] The simulated casing internal pressure pressurizing system (4) cooperates with the gas bottle (6) to perform seam-forming processing on the inner simulated cement ring (16) and the outer simulated cement ring (18);

[0046] 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 treatment;

[0047] The CT scanning module (2) is used to perform non-destructive scanning on the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) during the self-healing curing test of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16), and transmit the scanned data to the data processing module;

[0048] 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 stone based on 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 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).

[0049] In conjunction with the device shown in FIG1 , the self-healing ability analysis device for cementing cement in an embodiment of the present invention mainly comprises: a cement ring maintenance and cracking 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 cracking module (1) is combined with the cement stone structure in actual application, and a double-layer cement ring is provided 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. 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 the self-healing of the cement stone 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 the cementing cement stone are given, thereby improving the reliability and rationality of the self-healing ability analysis results of the cementing cement stone.

[0050] The following is a detailed introduction to the device and method for analyzing the self-healing ability of cement stone in the embodiments of the present invention.

[0051] FIG2 is a schematic diagram of a cement ring curing and cracking module in a cementing cement self-healing ability analysis device according to an embodiment of the present invention. As shown in FIG2 , the cement ring curing and cracking module (1) may further include: an outer kettle body (11), a kettle cover (12), a simulated wellbore lower end cover (13), a center 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 gas and liquid inlet hole (115) at the end of the cement ring, a gas and liquid outlet hole (116) at the end of the cement ring, and a gas and liquid flowmeter (119) at the end of the cement ring; wherein,

[0052] 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.

[0053] 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;

[0054] The outer layers of the inner simulated casing (15) are sequentially an inner simulated cement sheath (16), an outer simulated casing (17), an outer simulated cement sheath (18), and a simulated surrounding rock (19). Referring to FIG2 , the annular space between the inner simulated casing (15) and the outer simulated casing (17) is the inner simulated cement sheath (16), and the annular space between the outer simulated casing (17) and the simulated surrounding rock (19) is the outer simulated cement sheath (18).

[0055] 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);

[0056] 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 as a heating sleeve and sleeved on the outer layer of the outer kettle body (11).

[0057] 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 test process, 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.

[0058] In one embodiment, the upper temperature limit of all components in the cement ring curing and cracking module (1) reaches 260°C, and the upper pressure limit reaches 200 MPa. For example, the upper temperature limit of the external temperature sensor (112) and the upper pressure limit of the internal temperature sensor (120) both reach 260°C, and the upper pressure limit both reach 200 MPa. It should be noted that the prior art often ignores the difference between the temperature and pressure of the simulation experiment and the actual situation. In this example, the high temperature and high pressure conditions of the actual operation are fully considered. All components in the cement ring curing and cracking module (1) are high temperature resistant and high pressure resistant devices, which improves the reliability and rationality of the simulation of cement ring cracking and the analysis of the self-healing ability of cement stone.

[0059] In one embodiment, the kettle cover (12) is further 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 the lower end cover (13) of the simulated wellbore is provided with an air and liquid inlet hole (115) at the end of the cement ring. By providing pressurization holes and exhaust holes at multiple locations, cement ring maintenance and seam creation are made more practical.

[0060] In one embodiment, a support (110) is provided at the bottom of the outer kettle body (11), so that the cementing stone curing and self-healing can be carried out stably.

[0061] In one embodiment, the simulated surrounding rock (19) uses steel pipes of different thicknesses to simulate surrounding rocks of different properties by varying the thickness. It should be noted that the prior art often ignores the difference between the properties of the surrounding rock in the simulation experiment and in 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 sheath cracking and cement stone self-healing ability analysis.

[0062] 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.

[0063] The relationship between the simulated cement sheath of this device and the actual wellbore cement sheath is as follows:

[0064] Where: r 1模拟 is the inner radius of the simulated cement sheath, mm;

[0065] r 2模拟 is the outer radius of the simulated cement sheath, mm;

[0066] r 1实际 is the actual wellbore cement sheath inner radius, mm;

[0067] r 2实际 is the actual outer radius of the wellbore cement ring, mm.

[0068] Taking the original wellbore size of 215.9 mm 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 shows the actual wellbore cement sheath size, and Table 2 shows the simulated cement sheath size after reduction based on a similarity ratio of 0.35.

[0069] Table 1 Actual wellbore cement sheath dimensions

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

[0071] This example fully considers the service environment and spatial environment of the actual downhole cement sheath in actual conditions, further improving the reliability and rationality of the simulated cement sheath fracture formation and cement stone self-healing ability analysis.

[0072] In one embodiment, referring to FIG1 , the cementing cement self-healing ability analysis device may further 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 sheath (16) and the outer layer simulated cement sheath (18), and the fluid flow meter (8) is used to test the flow rate of the gas or liquid input into the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18).

[0073] In one embodiment, the gas cylinder (6) is a natural gas cylinder or a nitrogen cylinder, and the natural gas cylinder or nitrogen cylinder can be replaced according to actual test requirements.

[0074] 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 microannular gaps and microcracks of the cement sheath at any time.

[0075] 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 self-healing rate of the cement ring based on the flow data.

[0076] Finally, the data processing module (3) integrates the three-dimensional reconstruction results and the flow data calculation results to output the final cementing cement self-healing ability analysis results.

[0077] It should be noted that all components of the self-healing ability analysis device for well cementing stone in the embodiment of the present invention are disassembled and replaceable.

[0078] The present invention also provides a method for analyzing the self-healing ability of cement stone, which is applied to the self-healing ability analysis device of cement stone in the present invention. FIG3 is a flow chart of the method for analyzing the self-healing ability of cement stone in the present invention. As shown in FIG3, the method includes:

[0079] Step 301: Based on the cementing 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 a cracking treatment using a simulated casing internal pressure pressurization system (4) and a gas bottle (6), thereby obtaining an inner layer simulated cement ring (16) and an outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks;

[0080] Step 302: Using a crude oil pressure pump (5) and a gas bottle (6), a self-healing curing test is performed 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 curing test, the CT scanning module (2) is used to collect image data of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18), and flow data of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) during the self-healing curing test is collected.

[0081] 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 sheath;

[0082] Step 304: determining 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 outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16);

[0083] 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;

[0084] Step 306: Determine a cementing cement self-healing ability analysis result based on the first cementing cement self-healing ability analysis result and the second cementing cement self-healing ability analysis result.

[0085] As can be seen from the process shown in FIG3 , the self-healing ability analysis method of cementing stone in the embodiment of the present invention comprises: based on the self-healing ability analysis device of 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 a 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 a 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 using a 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 sheath at different moments in 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 sheath self-healing rate, and finally provide a cementing cement self-healing ability analysis result, thereby improving the reliability and rationality of the cementing cement self-healing ability analysis result.

[0086] The following is a detailed explanation of the method for analyzing the self-healing ability of cement stone according to an embodiment of the present invention.

[0087] The first step is curing. The curing temperature is adjusted by a heating jacket formed by a heating resistance wire (111) and a temperature control system formed by an inner temperature sensor (120) and an outer temperature sensor (112). 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.

[0088] The second step is to create cracks. The inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) are cracked by using the simulated casing internal pressure pressurization system (4) and the gas bottle (6), so as to obtain the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) with micro-annular gaps and micro-cracks.

[0089] Specifically, the gas inlet 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 the simulated casing internal pressure pressurization system (4), specifically, the 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 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.

[0090] Step 3: Self-healing maintenance and testing.

[0091] The embodiments of the present invention provide static self-healing maintenance and testing, and dynamic self-healing maintenance and testing.

[0092] Static self-healing maintenance and testing:

[0093] 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 sheath 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 sheath at the initial time (t0);

[0094] Then, using a natural gas bottle or crude oil pressure pump (5), natural gas or crude oil at a first preset pressure (e.g., between 0.1 and 5 MPa) is injected into the closed cavity of the cement sheath curing and seaming module (1). After maintaining the pressure for a first preset time (e.g., 1 to 5 minutes), the gas outlet and liquid outlet holes (116) at the end of the cement sheath are first closed, and then the gas inlet and liquid holes (115) at the end of the cement sheath are closed to ensure that the natural gas or crude oil at the corresponding pressure is sealed in the simulated cement sheath. The cement sheath is then cured at a preset temperature and pressure for a third preset time (e.g., any time of 4 to 24 hours).

[0095] Afterwards, the gas and liquid inlet hole (115) and the gas and liquid outlet hole (116) at the end of the cement sheath are opened in sequence, so that natural gas or crude oil of the same pressure is passed into the simulated cement sheath, and the flow rate of the natural gas or crude oil at the gas and liquid outlet hole (116) at the end of the cement sheath at any time point (t1) is recorded.

[0096] Dynamic self-healing maintenance and testing:

[0097] 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 sheath 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 sheath at the initial time (t0);

[0098] Then, a natural gas bottle or 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 of the cement sheath curing and seaming module (1), and the natural gas or crude oil at the corresponding pressure is kept sealed in the simulated cement sheath. The cement sheath end gas inlet hole (115) and the cement sheath end gas outlet hole (116) are continuously opened, and curing is carried out 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 cement sheath end gas outlet hole (116) at any time point (t1) is recorded.

[0099] Step 4: During the process of step 3, the CT scanning module (2) is continuously used to collect image data of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18). When the self-healing curing is completed, statistical flow data and image data are simultaneously obtained. Afterwards, the final cementing cement self-healing ability analysis results are obtained based on the flow data and image data. The cementing cement self-healing ability analysis results may include the self-healing response rate of the self-healing agent, the cement ring self-healing rate, and the quantitative level of the cementing cement self-healing effect.

[0100] Step 5: 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 ring (16) and the outer layer simulated cement ring (18).

[0101] Based on the flow rate 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:

[0102] Where, α 表观 (t) is the apparent self-healing response rate of the self-healing agent, 10 -3 min -1 ;

[0103] is the flow rate of the gas and liquid outlet hole (116) at the end of the cement sheath at the initial time (time t0), mL / min;

[0104] 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;

[0105] 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.

[0106] According to the apparent self-healing response rate of the self-healing agent, the self-healing rate of the cement sheath is calculated according to the following formula, which is recorded as the apparent self-healing rate of the cement sheath:

[0107] Where η 表观 is the self-healing rate of cement sheath, dimensionless (%);

[0108] 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;

[0109] t 终 The end time of the self-healing test of cement sheath in contact with oil or gas, min.

[0110] Step 6: Perform three-dimensional reconstruction using the image data to obtain three-dimensional reconstruction result data of the cement sheath, and determine the self-healing ability analysis result of the second cementing cement stone based on the three-dimensional reconstruction result data of the cement sheath.

[0111] In specific implementation, the image data is used for three-dimensional reconstruction to obtain the three-dimensional reconstruction result data of the cement sheath. Based on the three-dimensional reconstruction result data of the cement sheath, the total pore volume and microcrack volume inside the cement sheath at any time (including time t0, t1, t2, etc.) are determined. Based on the total pore volume and microcrack 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:

[0112] Where, is the total pore and microcrack volume inside the cement sheath at the initial time (t0), cm 3 ;

[0113] is the total pore and microcrack volume inside the cement sheath at time t1 (a certain moment during the test), cm 3 ;

[0114] is the total pore and microcrack volume inside the cement sheath at time t2 (except time t1 during the test), cm 3 ;

[0115] V 无效 is the volume of invalid pores and micro cracks inside the cement sheath, cm 3 .

[0116] 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 stone was effectively avoided.

[0117] According to the self-healing response rate of the real self-healing agent, the self-healing rate of the cement sheath is calculated according to the following formula, which is recorded as the real self-healing rate of the cement sheath:

[0118] Where η 真实 is the self-healing rate of cement sheath, dimensionless (%);

[0119] 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;

[0120] t 终 The termination time of the self-healing evaluation test of cement sheath in contact with oil or gas, min.

[0121] Step 7: Determine the self-healing ability analysis result of the cementing cement stone according to the first self-healing ability analysis result of the cementing cement stone and the second self-healing ability analysis result of the cementing cement stone.

[0122] Finally, the apparent self-healing agent self-healing response rate and the apparent cement sheath self-healing rate in the first cementing cement stone self-healing ability analysis results are comprehensively compared with the true self-healing agent self-healing response rate and the true cement sheath self-healing rate in the second cementing cement stone self-healing ability analysis results, and a comparative analysis is performed on the parts with more deviations. The test is re-performed. 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 based on the first cementing cement stone self-healing ability analysis results and the second cementing cement stone self-healing ability analysis results respectively.

[0123] Table 3 is a quantitative analysis and evaluation table of the self-healing response rate of the self-healing agent.

[0124] Table 3 Quantitative analysis and evaluation table of self-healing response rate of self-healing agents

[0125] Table 4 is a quantitative analysis and evaluation table of the self-healing effect of cement stone.

[0126] Table 4 Quantitative analysis and evaluation of cement stone self-healing effect

[0127] In summary, compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0128] (1) The embodiment of the present invention follows the principle of geometric similarity between the size of the simulated cement sheath in the simulated wellbore and the size of the cement sheath in the actual wellbore (casing-cement sheath-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 sheath slitting, and then realizing a maintenance-slitting-testing-analysis integrated design that is closer to the actual downhole cementing cement sheath service environment.

[0129] (2) The self-healing ability analysis device of cementing cement in 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 curing and cracking module (1) reaches 260°C, and the upper pressure limit reaches 200MPa.

[0130] (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 cement sheath structures.

[0131] (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-annuli and microcracks (through microcracks and microgaps 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 microcracks inside the cement sheath that cannot form natural gas flow channels on the self-healing effect of cement stone.

[0132] (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.

[0133] FIG4 is a schematic diagram of a computer device according to an embodiment of the present invention. As shown in FIG4 , the embodiment of the present invention further provides a computer device 400, comprising a processor 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program 403, the above-mentioned method for analyzing the self-healing ability of cement stone is implemented.

[0134] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for analyzing the self-healing ability of cement stone is implemented.

[0135] 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 computer program implements the above-mentioned method for analyzing the self-healing ability of cement stone.

[0136] The embodiment of the present invention provides a cementing cement self-healing ability analysis device, which mainly comprises: a cement ring maintenance and cracking 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 cracking module (1) is combined with the cement stone structure in actual application, and a double-layer cement ring is provided 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 the self-healing ability of the cement ring is analyzed. 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 the cement stone are given, thereby improving the reliability and rationality of the self-healing ability analysis results of the cement stone.

[0137] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, 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 magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0138] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes 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 produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0139] These computer program instructions may also be stored in a computer-readable memory that can direct 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 a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0140] 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, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0141] 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 invention is applied to a cementing cement self-healing ability analysis device, which 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: 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 simulate the cement ring of the inner layer after the seam treatment. (16), the outer layer simulated cement ring (18) is subjected to self-healing curing test; 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 sheath (16) and the outer layer simulated cement sheath (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 the gas or crude oil that enters one end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) and then flows out of the other end of the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18); The self-healing ability analysis method of cementing cement stone includes: 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. The method for analyzing the self-healing ability of cementing stone according to claim 11, characterized in that: The cement ring maintenance and seam-making module (1) of the cementing cement self-healing ability analysis device also includes: 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 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).

13. The method for analyzing the self-healing ability of cementing stone according to claim 12, characterized in that: The cement ring maintenance and seam-making module (1) of the well cementing cement self-healing ability analysis device 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).

14. The method for analyzing the self-healing ability of cementing stone according to claim 13, characterized in that: The upper temperature limits of the external temperature sensor (112) and the internal temperature sensor (120) of the well cementing cement self-healing ability analysis device both reach 260° C., and the upper pressure limits both reach 200 MPa.

15. The method for analyzing the self-healing ability of cementing stone according to claim 12, characterized in that: The simulated surrounding rock (19) of the well cementing cement self-healing ability analysis device adopts steel pipes of different thicknesses.

16. The method for analyzing the self-healing ability of cement paste according to claim 12, characterized in that: The geometric dimensions of the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) of the well cementing cement self-healing ability analysis device are determined by scaling in proportion to the actual wellbore geometric dimensions.

17. 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.

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