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

Abstract

The application discloses a cement sheath self-healing capacity analysis method and device, and relates to the technical field of oil and gas exploration and development, wherein the device comprises: a cement sheath curing and joint forming module, a CT scanning module, a data processing module, a simulated casing internal pressure pressurizing system, a crude oil pressurizing pump and a gas cylinder; the cement sheath curing and joint forming module is internally provided with a double-layer simulated cement sheath; the simulated casing internal pressure pressurizing system is used in cooperation with the gas cylinder to perform joint forming treatment on the double-layer simulated cement sheath; the crude oil pressurizing pump is used in cooperation with the gas cylinder to perform self-healing curing test on the double-layer simulated cement sheath after the joint forming treatment; the CT scanning module is used to perform nondestructive scanning on the double-layer simulated cement sheath in the self-healing curing test process of the double-layer simulated cement sheath, and scanning data is transmitted to the data processing module; and the data processing module is used to determine a cement sheath self-healing capacity analysis result. The application can improve the reliability and rationality of the cement sheath self-healing capacity analysis result.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas exploration and development, and particularly relates to a method and device for analyzing self-healing ability of cement sheath. BACKGROUND

[0002] This section is intended to provide background or context to the embodiments of the application recited in the claims. The description herein does not constitute admission that the prior art is prior art nor does it constitute an admission of any description in this section as prior art to an application described herein and / or in another application also owned by the applicant of the present application.

[0003] With the exploitation of natural gas to deep strata, the problem of annular pressure is becoming more and more serious. Under the action of external force, the cement sheath of oil and gas well may be damaged, such as micro-gap or micro-crack, and if the damage continues to develop, it may lead to serious problems such as cement sheath failure. The cementing methods commonly used to solve such problems include the use of high mechanical performance elastic expansion cement slurry and self-healing cement slurry system with self-repairing performance. The elastic expansion cement slurry system is mainly used to cope with perforation and fracturing during well completion operation, and can effectively cope with the damage of cement stone caused by tension and compression, but once the cement stone is damaged, it cannot achieve self-repairing effect. The self-healing cement slurry system can solve the problem of oil and gas channeling caused by the damage of cement sheath 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 corresponding evaluation of self-healing ability of cement stone, and there is still no recognized analysis method for the evaluation of self-healing ability of cement.

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

[0005] (1) Mechanical property analysis method:

[0006] This method is to test the mechanical properties (including compressive strength, bending strength and tensile strength, and bonding strength, etc.) of the cement stone before damage (or before healing) and after healing and curing, and to compare and analyze the self-healing ability of the cement sheath. The test method includes: curing the cement stone test block under certain conditions, after curing for a certain time, preparing the sample, testing the compressive strength, bending strength and tensile strength of the sample, putting the damaged sample into the curing device for further curing, after curing for a certain time, testing the mechanical properties (such as compressive strength, bending strength and tensile strength) of the sample again, and monitoring the recovery of the mechanical properties of the cement sample at different curing times. The ratio of the mechanical property data before and after healing is usually taken as the healing index of the self-healing cement.

[0007] (2) Acoustic emission method:

[0008] The phenomenon of building stress to produce deformation or fracture, releasing strain energy in the form of elastic wave is called acoustic emission. Acoustic emission is a dynamic and passive monitoring technology, unlike ultrasonic technology which needs external energy. It can truly achieve online and real-time monitoring, quickly reflect the damage state and defect position of the material, greatly saving monitoring time and reducing cost. From the 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 of the component. Before and after the healing of concrete, the internal changes will be manifested in the macroscopic acoustic emission signal. The cracks that do not expand will not produce 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) Electrical conductivity method:

[0010] For example, a Chinese patent with the patent number CN104502419B discloses an evaluation device and method for the self-healing ability of self-healing cement. This method measures the electrical conductivity of the electrolyte solution in the through hole of the cement stone, calculates the percentage reduction of 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 electrical conductivity of the electrolyte solution in the through hole of the cement stone at different ages to reflect the change of 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 reduction of the cross-sectional area of the through hole after t time.

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

[0012] The permeability / flow rate change analysis method is currently the most widely accepted method for analyzing the self-healing ability of cement stone. This method uses a CT scanner to measure the pore size of the cement stone module after the experiment, and tests the permeability of the cement stone before and after self-healing; according to the change of permeability and pore size, the self-healing performance of the self-healing cement stone after being eroded by gas is analyzed. The mechanical property evaluation method cannot reflect the seepage flow of formation fluid in the microcracks of the cement ring, while the permeability determination method can directly reflect the seepage flow of fluid in the microcracks of the cement ring. The method of analyzing the healing of the cement ring in well cementing using the cement stone permeability method has been recognized in the field of well cementing, but there is no unified test method. The main test process of this method is as follows: under certain conditions, the cement stone test block is cured, the microcracks are simulated by different degrees of damage, and then the change trend of the permeability of the cement stone is continuously monitored on the cement stone permeability tester, and the response time of the self-healing material and the healing time of the microcracks of the cement stone are recorded.

[0013] Overall, although various analysis methods have been established at present to analyze the self-healing ability of well cementing cement stone, these methods have many defects, such as:

[0014] (1) The prior art mainly analyzes the self-healing ability of single-layer cement sheath or single cement stone, but in actual application, single-layer cement sheath or single cement stone is not used alone, which leads to unreliable analysis results.

[0015] (2) The self-healing analysis method of the prior art relies on the changes of gas flow, permeability, electrical conductivity and mechanical properties to characterize the self-healing rate of the cement stone, and the changes of the above parameters can only describe the apparent self-healing effect of the cement stone, and the parameters are limited. Although the existing CT scanning method considers all changes of the pores and micro-cracks in the cement stone, it still lacks analysis of the volume changes of the internal micro annulus and micro-cracks in the self-healing process of the cement stone. SUMMARY

[0016] The embodiment of the present application also provides a cement stone self-healing ability analysis device for analyzing the self-healing ability of the cement stone in combination with the cement stone structure in actual application, analyzing the apparent characteristics and volume changes of the internal micro annulus and micro-cracks in the self-healing of the cement stone, and improving the reliability and rationality of the analysis results of the self-healing ability of the cement stone in well cementation. The device comprises a cement sheath curing and joint forming module, a CT scanning module, a data processing module, a simulated casing internal pressure pressurizing system, a crude oil pressurizing pump and a gas bottle. The cement sheath curing and joint forming module is internally provided with an inner layer simulated cement sheath and an outer layer simulated cement sheath.

[0017] The cement sheath curing and joint forming module is internally provided with an inner layer simulated cement sheath and an outer layer simulated cement sheath.

[0018] The simulated casing internal pressure pressurizing system cooperates with the gas bottle to perform joint forming treatment on the inner layer simulated cement sheath and the outer layer simulated cement sheath.

[0019] The crude oil pressurizing pump cooperates with the gas bottle to perform self-healing curing test on the inner layer simulated cement sheath and the outer layer simulated cement sheath after joint forming treatment.

[0020] The CT scanning module is used for non-destructive scanning of the inner layer simulated cement sheath and the outer layer simulated cement sheath during the self-healing curing test, and transmits the scanning data to the data processing module.

[0021] The data processing module is used for counting the flow data during the self-healing curing test of the inner layer simulated cement sheath and the outer layer simulated cement sheath, and performing three-dimensional reconstruction according to the scanning data sent by the CT scanning module. According to the three-dimensional reconstruction result and the flow data, the self-healing ability analysis result of the cement stone in well cementation is determined. The flow data is the flow data of the gas or crude oil flowing into 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.

[0022] The embodiment of the present application provides a cement sheath self-healing capacity analysis method, which is used for analyzing the cement sheath self-healing capacity in combination with the cement sheath structure in actual application, simultaneously analyzing the apparent characteristics and the volume changes of the internal micro annulus and micro cracks of the cement sheath self-healing, and improving the reliability and rationality of the cement sheath self-healing capacity analysis result.

[0023] 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 joint forming treatment by using a simulated casing internal pressure pressurizing system and a gas bottle, so that the inner layer simulated cement sheath and the outer layer simulated cement sheath with micro annulus and micro cracks are obtained.

[0024] The inner layer simulated cement sheath and the outer layer simulated cement sheath with micro annulus and micro cracks are subjected to self-healing curing test by using a crude oil pressurizing pump and a gas bottle, in the process of the self-healing curing test, image data of the inner layer simulated cement sheath and the outer layer simulated cement sheath are collected by using a CT scanning module, and flow data of the inner layer simulated cement sheath and the outer layer simulated cement sheath in the process of the self-healing curing test are counted.

[0025] After the self-healing curing test is completed, three-dimensional reconstruction is performed by using the image data, so that cement sheath three-dimensional reconstruction result data are obtained.

[0026] The first cement sheath self-healing capacity analysis result is determined according to the flow data of the inner layer simulated cement sheath and the outer layer simulated cement sheath in the process of the self-healing curing test.

[0027] The second cement sheath self-healing capacity analysis result is determined according to the cement sheath three-dimensional reconstruction result data.

[0028] The cement sheath self-healing capacity analysis result is determined according to the first cement sheath self-healing capacity analysis result and the second cement sheath self-healing capacity analysis result.

[0029] The embodiment of the present application also provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and the processor realizes the cement sheath self-healing capacity analysis method when executing the computer program.

[0030] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program realizes the cement sheath self-healing capacity analysis method when executed by a processor.

[0031] The embodiment of the present application also provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to realize the cement sheath self-healing capacity analysis method.

[0032] The cement sheath self-healing capacity analysis device provided in the embodiment of the present application mainly comprises a cement sheath curing and joint forming module, a CT scanning module, a data processing module, a simulated casing internal pressure pressurizing system, a crude oil pressurizing pump and a gas cylinder, wherein the cement sheath curing and joint forming module is internally provided with double-layer cement sheaths, i.e., an inner simulated cement sheath and an outer simulated cement sheath, so that the self-healing capacity of a single-layer cement sheath can be analyzed, and the self-healing capacity of a multi-layer cement sheath can also be analyzed; meanwhile, the CT scanning module scans the cement sheath image data in the self-healing curing test, three-dimensional reconstruction is performed by using the image data, the effective micro-annulus and micro-crack volumes in the cement sheath at different time periods can be determined according to the three-dimensional reconstruction result, the flow data of the gas or crude oil flowing into one end of the inner simulated cement sheath and the outer simulated cement sheath and flowing out from the other end of the inner simulated cement sheath and the outer simulated cement sheath are combined, the volume change of the internal micro-annulus and micro-crack and the apparent characteristics of the cement sheath self-healing are simultaneously analyzed, the real self-healing response rate of the self-healing agent and the cement sheath self-healing rate are calculated, the cement sheath self-healing capacity analysis result is finally given, and the reliability and rationality of the cement sheath self-healing capacity analysis result are improved.

[0033] The embodiment of the present application provides a cement sheath self-healing capacity analysis method, which comprises the following steps: based on the cement sheath self-healing capacity analysis device in the embodiment of the present application, after curing the inner layer simulated cement sheath and the outer layer simulated cement sheath for a preset number of days, the inner layer simulated cement sheath and the outer layer simulated cement sheath are subjected to joint forming treatment, then the inner layer simulated cement sheath and the outer layer simulated cement sheath with micro annular spaces and micro cracks are subjected to self-healing curing test, in the process of the self-healing curing test, the CT scanning module is used to collect image data of the inner layer simulated cement sheath and the outer layer simulated cement sheath, and flow data of the inner layer simulated cement sheath and the outer layer simulated cement sheath in the process of the self-healing curing test is counted, and the cement sheath self-healing capacity is analyzed based on the image data and the flow data. In the embodiment of the present application, the flow data of the gas-liquid hole at the end of the cement sheath at different moments in the self-healing process is continuously counted to determine the first cement sheath self-healing capacity analysis result, and the image data collected by the CT scanning module is used for three-dimensional reconstruction to determine the second cement sheath self-healing capacity analysis result, finally, the first cement sheath self-healing capacity analysis result and the second cement sheath self-healing capacity analysis result are comprehensively analyzed, the volume change of the internal micro annular space and the micro crack and the apparent characteristics of the cement sheath 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 cement sheath self-healing capacity analysis result is given, so that the reliability and rationality of the cement sheath self-healing capacity analysis result are improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort. In the drawings:

[0035] Figure 1 It is a schematic diagram of the cement sheath self-healing capacity analysis device in the embodiment of the present application;

[0036] Figure 2 It is a schematic diagram of the cement sheath self-healing capacity analysis device in the embodiment of the present application;

[0037] Figure 3 It is a flowchart of the cement sheath self-healing capacity analysis method in the embodiment of the present application;

[0038] Figure 4 It is a schematic diagram of the computer device in the embodiment of the present application. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative 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 various analytical methods have been established to analyze the self-healing ability of cement stone, these methods have many shortcomings, such as the lack of analysis on the volume changes of internal micro-annulus and micro-cracks during the self-healing process of cement stone, and unreliable analytical results. Therefore, the applicant proposed a device and method for analyzing the self-healing ability of cement stone.

[0041] Figure 1 This is a schematic diagram of the self-healing ability analysis device for cement stone in an embodiment of the present invention, as shown below. Figure 1 As shown, the device includes: a cement ring curing and joint creation 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 cylinder (6); among which,

[0042] The cement ring curing and jointing module (1) is equipped with an inner simulated cement ring (16) and an outer simulated cement ring (18);

[0043] The simulated sleeve internal pressure pressurization system (4) works in conjunction with the gas cylinder (6) to perform crack-making treatment on the inner simulated cement ring (16) and the outer simulated cement ring (18);

[0044] The crude oil pressurizing pump (5) is used in conjunction with the gas cylinder (6) to conduct self-healing curing tests on the inner simulated cement ring (16) and the outer simulated cement ring (18) after the cracking treatment.

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

[0046] The data processing module (3) is used to collect the flow data during the self-healing maintenance test of the outer simulated cement ring (18) and the inner simulated cement ring (16), and to perform three-dimensional reconstruction based on the scan data sent by the CT scanning module (2). Based on the three-dimensional reconstruction results and the flow data, the self-healing ability analysis results of the cement stone are determined. The flow data is the flow data of gas or crude oil that is introduced into one end of the outer simulated cement ring (18) and the inner simulated cement ring (16) and then flows out of the other end of the outer simulated cement ring (18) and the inner simulated cement ring (16).

[0047] CombinationFigure 1 The cement sheath self-healing ability analysis device shown in the embodiment of the present application mainly comprises: a cement sheath curing and joint forming module (1), a CT scanning module (2), a data processing module (3), a simulated casing internal pressure pressurizing system (4), a crude oil pressurizing pump (5), a gas bottle (6), wherein the cement sheath curing and joint forming module (1) is combined with the structure of the cement sheath in actual application, and is internally provided with double-layer cement sheaths: an inner layer simulated cement sheath (16) and an outer layer simulated cement sheath (18), which can analyze the self-healing ability of single-layer cement sheaths and can also analyze the self-healing ability of multi-layer cement sheaths; at the same time, the CT scanning module (2) scans the cement sheath image data in the self-healing curing test, three-dimensional reconstruction is carried out by using the image data, the effective micro annulus and micro crack volume inside the cement sheath at different periods can be determined according to the three-dimensional reconstruction result, and the flow data of the gas or crude oil flowing into 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) is combined, at the same time, the volume change of the internal micro annulus and micro crack and the apparent characteristics of the cement sheath self-healing are analyzed, the real self-healing response rate of the self-healing agent and the cement sheath self-healing rate are calculated, and finally the cement sheath self-healing ability analysis result is given, thereby improving the reliability and rationality of the cement sheath self-healing ability analysis result.

[0048] The cement sheath self-healing ability analysis device and method in the embodiment of the present application will be described in detail below.

[0049] Figure 2 The cement sheath curing and joint forming module in the cement sheath self-healing ability analysis device in the embodiment of the present application is shown in the schematic diagram as shown in the figure, Figure 2 The cement sheath curing and joint forming module (1) can also comprise: 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), a simulated surrounding rock (19) and a heating resistance wire (111), a cement sheath end gas inlet liquid hole (115), a cement sheath end gas outlet liquid hole (116), and a cement sheath end gas outlet flow meter (119); wherein,

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

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

[0052] The outer layer of the inner simulated casing (15) is in turn an inner simulated cement ring (16), an outer simulated casing (17), an outer simulated cement ring (18), and a simulated surrounding rock (19), combined 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 inlet liquid hole (115) and a cement ring end gas outlet liquid hole (116), and a cement ring end gas outlet liquid flow meter (119) is connected to the cement ring end gas outlet liquid 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 wrapped around the outer layer of the outer kettle body (11).

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

[0056] In one embodiment, the upper temperature resistance limit of all components in the cement ring curing and joint forming module (1) reaches 260℃, and the upper pressure resistance limit reaches 200Mpa. For example, the upper temperature resistance limit of the outer temperature sensor (112) and the inner temperature sensor (120) reaches 260℃, and the upper pressure resistance limit reaches 200MPa. It should be noted that the difference between the simulated experiment and the actual temperature and pressure is often ignored in the prior art, but in this example, the high temperature and high pressure conditions of the actual operation are fully considered, and all components in the cement ring curing and joint forming module (1) are made of high-temperature and high-pressure resistant components, which improves the reliability and rationality of the simulated cement ring joint forming and cement stone self-healing capability analysis.

[0057] In one embodiment, 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 center positioning shaft (14) is provided with an internal pressure pressurizing hole (113) and an internal pressure exhaust hole (114), the simulated wellbore lower end cover (13) is provided with a cement sheath end air inlet liquid hole (115), and the pressurizing holes and exhaust holes are arranged at multiple positions, so that the cement sheath curing and joint forming are more in line with the actual situation.

[0058] In one embodiment, the outer kettle body (11) is provided with a support (110) at the bottom, so that the cement sheath curing and self-healing are stably carried out.

[0059] In one embodiment, the simulated surrounding rock (19) adopts steel pipes with different thicknesses to simulate surrounding rocks with different properties. It should be noted that the difference between the simulation experiment and the actual situation of the surrounding rock properties is often ignored in the prior art, but in this example, the simulated surrounding rock (19) is selected to be a steel pipe with different thicknesses to simulate surrounding rocks with different properties, thereby improving the reliability and rationality of the analysis of the cement sheath joint forming and cement sheath self-healing ability simulation.

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

[0061] The simulated cement sheath of the device and the actual wellbore cement sheath have the following relationship:

[0062]

[0063] In the formula: 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 sheath, mm;

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

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

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

[0068] Table 1 Actual wellbore cement sheath size

[0069]

[0070] Table 2 shows the simulated cement sheath size after being reduced by 0.35

[0071]

[0072] The example fully considers the service environment and space environment of the real cement sheath in the actual situation, and further improves the reliability and rationality of the analysis of the self-healing ability of the simulated cement sheath.

[0073] In one embodiment, referring to Figure 1 The cement sheath self-healing ability analysis device can further include a plurality of pressure gauges (7) and a plurality of fluid flow meters (8), and a four-way valve (9), wherein the pressure gauges (7) are used to test the pressure of the input gas or liquid in the inner simulated cement sheath (16) and the outer simulated cement sheath (18), and the fluid flow meters (8) are used to test the flow of the input gas or liquid in the inner simulated cement sheath (16) and the outer simulated cement sheath (18).

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

[0075] Further, the data processing module (3) performs three-dimensional reconstruction on the scanning data sent by the CT scanning module (2) through a pre-set program, specifically, three-dimensional reconstruction is performed on various types of pores and micro-cracks in the cement sheath, and finally the volume of invalid pores and micro-cracks in the cement sheath and the volume of effective micro-annulus and micro-cracks in the cement sheath at any moment are obtained.

[0076] Meanwhile, the data processing module (3) obtains the flow data in the process of self-healing and curing test of the outer simulated cement sheath (18) and the inner simulated cement sheath (16) 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 sheath according to the flow data.

[0077] Finally, the data processing module (3) comprehensively outputs the final cement sheath self-healing ability analysis result by combining the three-dimensional reconstruction result and the flow data calculation result.

[0078] It should be noted that all components of the cement sheath self-healing ability analysis device in the embodiment of the present application are detachable and replaceable.

[0079] The embodiment of the present application further provides a cement sheath self-healing ability analysis method applied to the cement sheath self-healing ability analysis device in the embodiment of the present application, Figure 3 The flowchart of the cement sheath self-healing ability analysis method in the embodiment of the present application is shown in Figure 3 The method comprises the following steps:

[0080] Step 301, based on the self-healing ability analysis device of the cement stone, after the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) are cured for a preset number of days, the simulated casing internal pressure pressurizing system (4) and the gas bottle (6) are used to perform joint forming treatment on the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18), so as to obtain the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) with micro annulus and micro cracks;

[0081] Step 302, the crude oil pressurizing pump (5) and the gas bottle (6) are used to perform self-healing curing test on the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) with micro annulus and micro cracks, and in the process of 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) in the process of the self-healing curing test is counted;

[0082] Step 303, after the self-healing curing test is completed, three-dimensional reconstruction is performed on the image data to obtain cement sheath three-dimensional reconstruction result data;

[0083] Step 304, according to the flow data of the outer layer simulated cement sheath (18) and the inner layer simulated cement sheath (16) in the process of the self-healing curing test, a first self-healing ability analysis result of the cement stone is determined;

[0084] Step 305, according to the cement sheath three-dimensional reconstruction result data, a second self-healing ability analysis result of the cement stone is determined;

[0085] Step 306, 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, a self-healing ability analysis result of the cement stone is determined.

[0086] From Figure 3As shown in the flow, the cement sheath self-healing ability analysis method in the embodiment of the application comprises: based on the cement sheath self-healing ability analysis device in the embodiment of the application, after curing the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) for a preset number of days, the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) are subjected to joint forming treatment, and then the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) with micro annulus and micro cracks are subjected to self-healing curing test, in the process of 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) in the process of the self-healing curing test is counted, and the cement sheath self-healing ability is analyzed based on the image data and the flow data. In the embodiment of the application, the flow data of the cement sheath end gas-liquid hole (116) at different time in the self-healing process is continuously counted to determine the first cement sheath self-healing ability analysis result, and the image data collected by the CT scanning module is used for three-dimensional reconstruction to determine the second cement sheath self-healing ability analysis result, and finally the first cement sheath self-healing ability analysis result and the second cement sheath self-healing ability analysis result are comprehensively analyzed to realize the analysis of the volume change of the internal micro annulus and micro cracks and the apparent characteristics of the cement sheath self-healing, the real self-healing response rate of the self-healing agent and the cement sheath self-healing rate are calculated, and finally the cement sheath self-healing ability analysis result is given, thereby improving the reliability and rationality of the cement sheath self-healing ability analysis result.

[0087] The cement sheath self-healing ability analysis method in the embodiment of the application will be explained in detail below.

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

[0089] The second step is joint forming. The inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) are subjected to joint forming treatment by using the simulated casing internal pressure pressurizing system (4) and the gas bottle (6), and the inner layer simulated cement sheath (16) and the outer layer simulated cement sheath (18) with micro annulus and micro cracks are obtained.

[0090] Specifically, the cement ring end gas inlet liquid hole (115) is opened, 2-5 MPa nitrogen gas is introduced by using a gas cylinder (6) (at this time, a nitrogen cylinder), and the hydraulic pressure in the casing is increased by using the simulated casing internal pressure pressurizing system (4), specifically, experimental oil is filled, the pressurization rate is controlled at 0.5-5 MPa / min according to requirements, until the preset flow rate of nitrogen gas flow is detected at the cement ring end gas outlet liquid hole (116), and the pressure is maintained for a first preset time length, for example, 10 min, then pressure relief is performed by using the internal pressure vent hole 114, at this time, the joint forming is completed, and the inner layer simulated cement ring (16) and the outer layer simulated cement ring (18) with a micro annular gap and a micro crack are obtained.

[0091] The third step is self-healing maintenance and testing.

[0092] The static self-healing maintenance and testing and the dynamic self-healing maintenance and testing are provided in the embodiment of the present application.

[0093] The static self-healing maintenance and testing:

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

[0095] Then, the natural gas cylinder or the crude oil pressurizing pump (5) is used to inject natural gas or crude oil at a first preset pressure (for example, between 0.1-5 MPa) into the closed cavity in the cement ring maintenance and joint forming module (1), after maintaining for a first preset time length (for example, 1-5 min), the cement ring end gas outlet liquid hole (116) is closed first, and then the cement ring end gas inlet liquid hole (115) is closed, so that the natural gas or crude oil at the corresponding pressure is sealed in the simulated cement ring, and the maintenance is performed at a preset temperature and pressure for a third preset time length (for example, any time length of 4-24 h);

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

[0097] The dynamic self-healing maintenance and testing:

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

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

[0100] In the fourth step, the CT scanning module (2) is continuously used to collect image data of the inner simulated cement sheath (16) and the outer simulated cement sheath (18) during the third step, and the statistical flow rate data and the image data are obtained at the same time when the self-healing curing is completed. Then, according to the flow rate data and the image data, the final analysis result of the self-healing ability of the cement sheath is obtained, which can include the self-healing response rate of the self-healing agent, the self-healing rate of the cement sheath, and the self-healing effect quantification grade of the cement sheath, etc.

[0101] In the fifth step, the first analysis result of the self-healing ability of the cement sheath is determined according to the flow rate data during the self-healing curing test of the inner simulated cement sheath (16) and the outer simulated cement sheath (18).

[0102] According to the flow rate data during the self-healing curing test of the inner simulated cement sheath (16) and the outer simulated cement sheath (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 cement sheath at the initial time (t0), mL / min;

[0106] is the flow rate of the cement sheath at t1 (a certain time during the test), mL / min;

[0107] is the flow rate of the cement sheath at t2 (a time other than t1 during the test), mL / min.

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

[0109]

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

[0111] t0 is the initial time of the flow rate of the gas-liquid hole (116) at the end of the cement sheath, min;

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

[0113] In the sixth step, three-dimensional reconstruction is performed using the image data to obtain cement sheath three-dimensional reconstruction result data, and the second cement sheath self-healing ability analysis result is determined according to the cement sheath three-dimensional reconstruction result data.

[0114] In specific implementation, three-dimensional reconstruction is performed using the image data to obtain cement sheath three-dimensional reconstruction result data, and the total internal pore and microcrack volume of the cement sheath at any time (including t0, t1, t2, etc.) is determined according to the cement sheath three-dimensional reconstruction result data, and the self-healing agent self-healing response rate is calculated according to the following formula according to the total internal pore and microcrack volume of the cement sheath, which is denoted as the true self-healing agent self-healing response rate:

[0115]

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

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

[0118] is the total internal pore and microcrack volume of the cement sheath at t2 (a time other than t1 during the test), cm 3 ;

[0119] V 无效 is the internal pore and microcrack volume of the cement sheath that cannot form a natural gas flow channel, cm 3 .

[0120] In this example, the effective avoids the influence of the invalid pore and microcrack volume in the cement sheath that cannot form a natural gas flow channel on the self-healing effect of the cement sheath.

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

[0122]

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

[0124] t0 is the initial time of the flow of the gas-liquid hole (116) at the end of the cement sheath, min;

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

[0126] In the seventh step, the self-healing ability analysis result of the cement sheath is determined according to the self-healing ability analysis result of the first cement sheath and the self-healing ability analysis result of the second cement sheath.

[0127] Finally, the apparent self-healing agent self-healing response rate and the apparent cement sheath self-healing rate in the self-healing ability analysis result of the first cement sheath and the real self-healing agent self-healing response rate and the real cement sheath self-healing rate in the self-healing ability analysis result of the second cement sheath are compared and analyzed, and for the part with more deviation, retesting is performed, and when the overall trend of the self-healing ability analysis result of the first cement sheath and the self-healing ability analysis result of the second cement sheath is consistent, the self-healing ability analysis result of the cement sheath can be determined according to the self-healing ability analysis result of the first cement sheath and the self-healing ability analysis result of the second cement sheath, respectively.

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

[0129] Table 3 is a self-healing agent self-healing response rate quantitative analysis evaluation table.

[0130] Self-healing response rate a / (10 -3 min -1 )]]> Self-healing response effect 1.250-1.389 Very fast 1.111-1.250 Fast 0.972-1.111 Faster 0.833-0.972 General 0.556-0.833 Slower 0.278-0.556 Slow 0.000-0.278 Very slow

[0131] Table 4 is a cement sheath self-healing effect quantitative analysis evaluation table.

[0132] Table 4 is a cement sheath self-healing effect quantitative analysis evaluation table.

[0133] Cement stone self-healing rate (%) Cement stone self-healing effect 0-30 Poor 30-60 General 60-80 Better 80-90 Good 90-100 Excellent

[0134] Compared with the prior art, the embodiments of the present application have the following advantages and beneficial effects:

[0135] (1) The embodiment of the present application follows the geometric similarity principle of simulating the size of the simulated cement sheath in the wellbore and the size of the cement sheath in the actual wellbore (casing-cement sheath-formation combination), and uses different wall thickness steel pipes to simulate different properties of the surrounding rock, thereby improving the reliability and rationality of the cement sheath jointing, and realizing the integration of maintenance-jointing-testing-analysis design closer to the real downhole cement sheath service environment.

[0136] (2) The cement stone self-healing capacity analysis device of the embodiment of the present application meets the actual high temperature and high pressure conditions of deep natural gas wells, and the temperature resistance upper limit of all components in the cement sheath maintenance and jointing module (1) reaches 260 DEG C, and the pressure resistance upper limit reaches 200 MPa.

[0137] (3) The cement stone self-healing capacity analysis device of the embodiment of the present application can analyze the self-healing capacity of single-layer cement sheath and the self-healing capacity of multi-layer cement sheath, thereby improving the analysis capability of simulating complex cement sheath structure.

[0138] (4) The embodiment of the present application combines the CT scanning method and the three-dimensional reconstruction image processing technology to characterize the volume change of the effective micro annulus and micro cracks (through micro cracks and micro gaps that can provide channels for natural gas channeling) in the self-healing process of the cement sheath, and gives the calculation method of the real 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 in the cement sheath that cannot form natural gas flow channels on the self-healing effect of the cement stone.

[0139] (5) The embodiment of the present application combines the analysis results of using flow data to analyze the self-healing capacity of the cement stone and the analysis results of using three-dimensional reconstruction technology, so that the analysis results of the self-healing capacity of the cement stone are more reliable.

[0140] Figure 4 The schematic diagram of the computer device in the embodiment of the present application is shown in FIG. Figure 4 The computer device 400 provided by the embodiment of the present application includes a processor 401, a memory 402, and a computer program 403 stored in the memory 402 and executable on the processor 401. The processor 401 executes the computer program 403 to realize the cement stone self-healing capacity analysis method described above.

[0141] The computer readable storage medium provided by the embodiment of the present application stores a computer program, and the computer program is executed by the processor to realize the cement stone self-healing capacity analysis method described above.

[0142] The embodiment of the present application further provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to realize the cement sheath self-healing capacity analysis method.

[0143] The embodiment of the present application provides a cement sheath self-healing capacity analysis device, which mainly comprises a cement sheath curing and joint forming module (1), a CT scanning module (2), a data processing module (3), a simulated casing internal pressure pressurizing system (4), a crude oil pressurizing pump (5) and a gas bottle (6), wherein the cement sheath curing and joint forming module (1) is combined with the cement sheath structure in actual application and is internally provided with double-layer cement sheaths, namely an inner simulated cement sheath (16) and an outer simulated cement sheath (18), so that the self-healing capacity of a single-layer cement sheath can be analyzed, and the self-healing capacity of a multi-layer cement sheath can also be analyzed; meanwhile, the CT scanning module (2) scans the cement sheath image data in the self-healing curing test, three-dimensional reconstruction is performed by using the image data, the effective micro-annulus and micro-crack volumes in the cement sheath at different periods can be determined according to the three-dimensional reconstruction result, the flow data of the gas or crude oil flowing into one end of the inner simulated cement sheath (16) and the outer simulated cement sheath (18) and flowing out of the other end of the inner simulated cement sheath (16) and the outer simulated cement sheath (18) are combined, the volume change of the internal micro-annulus and micro-crack and the apparent characteristics of the cement sheath 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 cement sheath self-healing capacity analysis result is given, so that the reliability and rationality of the cement sheath self-healing capacity analysis result are improved.

[0144] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product implemented on one or more computer usable storage media containing computer usable program codes (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.).

[0145] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams and the combination of the flows and / or blocks can be realized by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device for realizing the functions specified in the flowcharts and / or block diagrams. Figure 1 one flow or multiple flows and / or blocksFigure 1 means for performing the function specified in the block or blocks.

[0146] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a Figure 1 flow or flows and / or blocks Figure 1 means for performing the function specified in the block or blocks.

[0147] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 flow or flows and / or blocks Figure 1 steps of means for performing the function specified in the block or blocks.

[0148] The above specific embodiments are described to explain the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for analyzing the self-healing ability of cementing stone, characterized in that, include: The system includes a cement ring curing and joint creation 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 cylinder (6); among which, The cement ring curing and jointing module (1) is equipped with an inner simulated cement ring (16) and an outer simulated cement ring (18); The simulated sleeve internal pressure pressurization system (4) works in conjunction with the gas cylinder (6) to perform crack-making treatment on the inner simulated cement ring (16) and the outer simulated cement ring (18); The crude oil pressurizing pump (5) is used in conjunction with the gas cylinder (6) to conduct self-healing curing tests on the inner simulated cement ring (16) and the outer simulated cement ring (18) after the cracking treatment. The CT scanning module (2) is used to perform non-destructive scanning on the inner simulated cement ring (16) and the outer simulated cement ring (18) during the self-healing maintenance test of the inner simulated cement ring (16) and the outer simulated cement ring (18), and transmit the scan data to the data processing module (3). The data processing module (3) is used to collect the flow data during the self-healing maintenance test of the inner simulated cement ring (16) and the outer simulated cement ring (18), and to perform three-dimensional reconstruction based on the scan data sent by the CT scanning module (2). Based on the three-dimensional reconstruction results and the flow data, the self-healing ability analysis results of the cement stone are determined. The flow data is the flow data of gas or crude oil that is introduced into one end of the inner simulated cement ring (16) and the outer simulated cement ring (18) and then flows out of the other end of the inner simulated cement ring (16) and the outer simulated cement ring (18).

2. The apparatus as claimed in claim 1, characterized in that, The cement ring curing and joint-forming module (1) further includes: an outer vessel body (11), a vessel cover (12), a simulated wellbore lower end cover (13), a central positioning shaft (14), an inner simulated casing (15), an outer simulated casing (17), simulated surrounding rock (19), a heating resistance wire (111), a cement ring end air-liquid inlet hole (115), a cement ring end air-liquid outlet hole (116), and a cement ring end air-liquid flow meter (119); wherein, The outer vessel body (11) and the vessel cover (12) are connected by threads and a metal cone seal to form a closed cavity; The middle of the vessel cover (12) and the lower end cover (13) of the simulated well barrel is hollowed out and connected to the central positioning shaft (14). The vessel cover (12), the lower end cover (13) of the simulated well barrel, the central positioning shaft (14), and the inner simulated casing (15) form a closed space. The outer layer of the inner simulated casing (15) consists of the inner simulated cement ring (16), the outer simulated casing (17), the outer simulated cement ring (18), and the simulated surrounding rock (19). A gas-liquid inlet hole (115) and a gas-liquid outlet hole (116) are provided on the lid (12) of the cement ring. A gas-liquid outlet flow meter (119) of the cement ring is connected to the gas-liquid outlet hole (116) of the cement ring outside the outer body (11). The heating resistance wire (111) is disposed on the outer layer of the outer vessel body (11).

3. The apparatus as described in claim 2, characterized in that, The cement ring curing joint module (1) further includes: an inner temperature sensor (120) and an outer temperature sensor (112); wherein the inner temperature sensor (120) is set on the central positioning shaft (14) and the outer temperature sensor (112) is set on the outer layer of the outer vessel body (11).

4. The apparatus as described in claim 3, characterized in that, The upper temperature limit of the external temperature sensor (112) and the upper pressure limit of the internal temperature sensor (120) both reach 260℃ and 200MPa.

5. The apparatus as described in claim 2, characterized in that, The pressure-increasing hole (117), pressure-exhausting hole (118), and internal pressure exhaust hole (114) are also provided on the lid (12). The internal pressure-increasing hole (113) and internal pressure exhaust hole (114) are provided on the central positioning shaft (14). The lower end cover (13) of the simulated well barrel is provided with a gas-liquid inlet hole (115) at the end of the cement ring.

6. The apparatus as claimed in claim 2, characterized in that, A support (110) is provided at the bottom of the outer vessel body (11).

7. The apparatus as claimed in claim 2, characterized in that, The simulated surrounding rock (19) uses steel pipes of different thicknesses.

8. The apparatus as claimed in claim 2, characterized in that, The geometric dimensions of the inner simulated cement ring (16) and the outer simulated cement ring (18) are determined by scaling the actual wellbore geometry proportionally.

9. The apparatus as claimed in claim 2, characterized in that, The device also includes multiple pressure gauges (7), multiple fluid flow meters (8), and a four-way valve (9); wherein, the pressure gauges (7) are used to test the pressure of the gas or liquid input into the inner simulated cement ring (16) and the outer simulated cement ring (18), and the fluid flow meters (8) are used to test the flow rate of the gas or liquid input into the inner simulated cement ring (16) and the outer simulated cement ring (18).

10. The apparatus as claimed in 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 well cement stone self-healing ability analysis device according to any one of claims 1 to 10 includes: After the inner simulated cement ring (16) and the outer simulated cement ring (18) have been cured for a preset number of days, the inner simulated cement ring (16) and the outer simulated cement ring (18) are subjected to cracking treatment using the simulated sleeve internal pressure pressurization system (4) and gas cylinder (6) to obtain the inner simulated cement ring (16) and the outer simulated cement ring (18) with micro-annular gaps and micro-cracks. Self-healing curing tests were conducted on the inner simulated cement ring (16) and the outer simulated cement ring (18) with micro-annular gaps and micro-cracks using crude oil pressurization pump (5) and gas cylinder (6). During the self-healing curing test, image data of the inner simulated cement ring (16) and the outer simulated cement ring (18) were collected using CT scanning module (2), and the flow data of the inner simulated cement ring (16) and the outer simulated cement ring (18) during the self-healing curing test were statistically analyzed. After the self-healing curing test was completed, the image data was used to perform three-dimensional reconstruction to obtain the three-dimensional reconstruction result data of the cement ring. Based on the flow data during the self-healing curing test of the inner simulated cement sheath (16) and the outer simulated cement sheath (18), the analysis results of the self-healing ability of the first cement stone were determined. Based on the three-dimensional reconstruction results of the cement sheath, the analysis results of the self-healing ability of the second cement stone were determined; Based on the analysis results of the self-healing ability of the first and second cementing stones, the analysis results of the self-healing ability of the cementing stones are determined.

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, it implements the method of claim 11.

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

14. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of claim 11.

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