Device and method for measuring bonding strength of cement sheath interface of high-temperature and high-pressure well and thermal production well

Abstract

The invention provides a high-temperature and high-pressure well and thermal production well cement sheath interface bonding strength measuring device and method, and relates to the field of oil and gas field exploration and development. The system comprises a water heating kettle, a casing pressure and confining pressure control system, a first testing system, a second testing system and an acoustic variable-density logging system. The hydrothermal kettle comprises a kettle body; a stratum model is arranged in the kettle body, and a sleeve is arranged in the model; the model and the kettle body form a confining pressure cavity, and the sleeve and the model form an annular structure for forming a cement sheath; the first interface and the second interface are interfaces of the cement sheath, the sleeve and the model respectively; the casing pressure control system comprises a first pipeline and a second pipeline; the first pipeline is connected with the heater; the confining pressure control system comprises a third pipeline and a fourth pipeline; the first testing system comprises a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline; the pipeline is provided with a pressure gauge; the second test system comprises a first pressure sensor and a second pressure sensor; the logging system comprises an ultrasonic assembly and a sound wave variable density logging instrument. The problem that the cementation strength evolution of a well cementation cementation surface is not comprehensive under the conditions of high temperature and thermal production well circulation temperature is solved.

Description

Technical Field

[0001] The present application relates to the field of oil and gas field exploration and development, and particularly relates to a device and method for measuring the bonding strength of the cement sheath interface of high-temperature and high-pressure wells and thermal recovery wells. Background Art

[0002] The bonding strength of the cement sheath directly affects the sealing performance of cementing, the stability of the wellbore, and the smooth progress of downhole operations. Therefore, the bonding strength of the cement sheath is crucial for the life and wellhead safety of oil and gas wells. At the same time, the bonding strength of the cement sheath is closely related to the long-term safety and economic benefits of oil and gas wells. Therefore, it is particularly important to monitor the bonding strength of the cement sheath under different working conditions.

[0003] In the prior art, the tests mainly focus on normal-temperature wells. An evaluation device for the bonding strength of the cement sheath based on normal-temperature wells has been developed, and the tests on the bonding strength of the cement sheath under variable casing internal pressure conditions have been carried out, and the measurement results of the bonding strength experiment of the cementing bonding surface have been reported. However, the evolution of the bonding strength of the cementing bonding surface under high-temperature conditions and the cyclic temperature conditions of thermal recovery wells is not comprehensive enough. Summary of the Invention

[0004] The present application provides a device and method for measuring the bonding strength of the cement sheath interface of high-temperature and high-pressure wells and thermal recovery wells, so as to solve the technical problem that the prior art is not comprehensive enough in the evolution of the bonding strength of the cementing bonding surface under high-temperature conditions and the cyclic temperature conditions of thermal recovery wells.

[0005] In a first aspect, the present application provides a device for measuring the bonding strength of the cement sheath interface of high-temperature and high-pressure wells and thermal recovery wells, including:

[0006] A hydrothermal autoclave, a casing pressure control system, an external pressure control system, a first test system, a second test system, and an acoustic variable density logging system;

[0007] The hydrothermal autoclave includes a kettle body; a formation model is arranged in the kettle body, and a casing is arranged in the formation model;

[0008] A confining pressure chamber is formed between the formation model and the kettle body, and an annulus structure is formed between the casing and the formation model. The annulus structure is used to form a cement sheath; the first interface of the cementing bonding surface is the interface between the cement sheath and the casing, and the second interface of the cementing bonding surface is the interface between the cement sheath and the formation model;

[0009] The casing pressure control system includes a first pipeline and a second pipeline, and the first pipeline is connected to a heater; the first pipeline and the second pipeline are jointly used to adjust the pressure applied to the casing;

[0010] The confining pressure control system includes a third pipeline and a fourth pipeline; the third pipeline and the fourth pipeline are jointly used to adjust the pressure applied to the confining pressure chamber;

[0011] The first test system includes a fifth pipeline, a sixth pipeline, a seventh pipeline and an eighth pipeline; the fifth pipeline and the sixth pipeline are jointly used to adjust the pressure applied to the first interface of the cementing interface, and the seventh pipeline and the eighth pipeline are jointly used to adjust the pressure applied to the second interface of the cementing interface;

[0012] A pressure gauge is provided on each of the pipelines;

[0013] The second test system includes a first pressure sensor and a second pressure sensor; the first pressure sensor is used to monitor the pressure applied to the first interface of the cementing interface, and the second pressure sensor is used to monitor the pressure applied to the second interface of the cementing interface;

[0014] The acoustic variable density logging system includes an ultrasonic component and an acoustic variable density logging tool, which are jointly used to detect the amplitude of the first wave of the casing wave in the casing and judge the cementing condition of the cementing interface according to the amplitude.

[0015] In a possible design, a first constant speed and constant pressure pump and a first control valve are further provided on the first pipeline, and a second control valve is further provided on the second pipeline; the first pipeline is connected to the casing pressure gas storage tank through the heater, and the second pipeline is connected to the casing pressure gas storage tank.

[0016] In a possible design, a second constant speed and constant pressure pump and a third control valve are further provided on the third pipeline, and a fourth control valve is further provided on the fourth pipeline; the third pipeline is connected to the liquid injection tank, and the fourth pipeline is connected to the waste liquid tank.

[0017] In a possible design, a third constant speed and constant pressure pump and a fifth control valve are further provided on the fifth pipeline, and a sixth control valve is further provided on the sixth pipeline; the fifth pipeline is connected to the first gas injection tank, and the sixth pipeline is connected to the first waste gas tank.

[0018] In a possible design, a fourth constant speed and constant pressure pump and a seventh control valve are further provided on the seventh pipeline, and an eighth control valve is further provided on the eighth pipeline; the seventh pipeline is connected to the second gas injection tank, and the eighth pipeline is connected to the second waste gas tank.

[0019] In a possible design, one end of each of the first pipeline and the second pipeline passes through the kettle body and is placed in the casing pressure chamber, and the other end of each of the first pipeline and the second pipeline is connected to the casing pressure gas storage tank;

[0020] One end of each of the third pipeline and the fourth pipeline passes through the kettle body and is placed in the confining pressure chamber. The other end of the third pipeline is connected to the liquid injection tank, and the other end of the fourth pipeline is connected to the waste liquid tank;

[0021] One end of each of the fifth pipeline and the sixth pipeline passes through the kettle body and is placed in the annulus structure. The other end of the fifth pipeline is connected to the first gas injection tank, and the other end of the sixth pipeline is connected to the first waste gas tank;

[0022] One end of each of the seventh pipeline and the eighth pipeline passes through the kettle body and is placed in the annulus structure. The other end of the seventh pipeline is connected to the second gas injection tank, and the other end of the eighth pipeline is connected to the second waste gas tank.

[0023] In a possible design, the shape of the formation model is cylindrical; a wellbore is provided at the central position of the formation model, and the casing is arranged in the wellbore;

[0024] An ultrasonic component is provided at the central position of the casing, and the ultrasonic component is connected to a sonic variable density logging tool; wherein, the ultrasonic component and the sonic variable density logging tool are jointly used to measure the attenuation value and amplitude of the casing wave in the circumferential direction of the wellbore.

[0025] In a second aspect, the present application provides a method for measuring the bond strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well. The method is used for the device for measuring the bond strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well provided in the first aspect of the present application. The device includes: a hydrothermal kettle and a casing pressure control system; wherein, the hydrothermal kettle includes a kettle body, a formation model is arranged in the kettle body, and a casing is arranged in the formation model; the casing pressure control system includes a first pipeline, and the first pipeline is connected to a heater. An annulus structure is formed between the casing and the formation model, and the annulus structure is used to form a cement sheath; the first interface of the cementing bond surface is the interface between the cement sheath and the casing, and the second interface of the cementing bond surface is the interface between the cement sheath and the formation model. Then the method includes:

[0026] Adjust the temperature condition of the first pipeline through the heater, and test the hydraulic bond strength of the first interface of the cementing bond surface, the hydraulic bond strength of the second interface of the cementing bond surface, the mechanical bond strength of the first interface of the cementing bond surface, and the mechanical bond strength of the second interface of the cementing bond surface under different temperature conditions; wherein, the temperature conditions include high-temperature conditions and cyclic temperature conditions, and the high-temperature conditions are conditions higher than a preset temperature.

[0027] In a possible design, the device further includes a second test system. The first test system in the device further includes a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, and a pressure gauge provided on each pipeline. Wherein, the second test system includes a first pressure sensor and a second pressure sensor;

[0028] Adjusting the temperature condition of the first pipeline through the heater and testing the hydraulic bonding strength of the first interface of the cementing interface, the hydraulic bonding strength of the second interface of the cementing interface, the mechanical bonding strength of the first interface of the cementing interface, and the mechanical bonding strength of the second interface of the cementing interface under different temperature conditions includes:

[0029] Record the initial reading of the pressure gauge on the fifth pipeline, apply pressure to the fifth pipeline, stop applying pressure to the fifth pipeline when the reading of the pressure gauge on the sixth pipeline starts to increase, and when the reading of the pressure gauge on the sixth pipeline is equal to the reading of the pressure gauge on the fifth pipeline, obtain the hydraulic bonding strength of the first interface of the cementing interface at the preset temperature according to the difference between the reading of the pressure gauge on the sixth pipeline and the reading of the pressure gauge on the fifth pipeline when the last pressure increase value changes;

[0030] Record the initial reading of the pressure gauge on the seventh pipeline, apply pressure to the seventh pipeline, stop applying pressure to the seventh pipeline when the reading of the pressure gauge on the eighth pipeline starts to increase, and when the reading of the pressure gauge on the eighth pipeline is equal to the reading of the pressure gauge on the seventh pipeline, obtain the hydraulic bonding strength of the second interface of the cementing interface at the preset temperature according to the difference between the reading of the pressure gauge on the eighth pipeline and the reading of the pressure gauge on the seventh pipeline when the last pressure increase value changes;

[0031] Apply pressure to the casing and observe the value of the first pressure sensor in real time. When the cement sheath separates from the casing, obtain the mechanical bonding strength of the first interface of the cementing interface at the preset temperature according to the value of the first pressure sensor when the last pressure increase value changes;

[0032] Apply pressure to the cement sheath and observe the value of the second pressure sensor in real time. When the cement sheath separates from the formation model, obtain the mechanical bonding strength of the second interface of the cementing interface at the preset temperature according to the value of the second pressure sensor when the last pressure increase value changes;

[0033] Wherein, cement slurry is injected into the annulus structure to obtain the cement sheath; when determining the temperature preset value according to the high temperature condition, the curing temperature of the cement sheath is set as the temperature preset value; when determining the temperature preset value according to the circulating temperature condition, the temperature of the gas in the first pipeline is adjusted to the temperature preset value by the heater.

[0034] In a possible design, the device further includes a first upper kettle cover and a second upper kettle cover. The second upper kettle cover includes a concave structure. The first upper kettle cover is provided with a first injection port, a second injection port, a third injection port and a fourth injection port. The second upper kettle cover is provided with a fifth injection port and a sixth injection port.

[0035] Before obtaining the hydraulic bonding strength of the first interface of the cementing bonding surface at the obtained temperature preset value, the method further includes:

[0036] Install the first upper kettle cover, and connect the first pipeline, the third pipeline, the fifth pipeline and the seventh pipeline to the first upper kettle cover through the first injection port, the second injection port, the third injection port and the fourth injection port respectively.

[0037] Before obtaining the mechanical bonding strength of the first interface of the cementing bonding surface at the obtained temperature preset value, the method further includes:

[0038] Replace the first upper kettle cover with the second upper kettle cover, and connect the first pipeline and the third pipeline to the second upper kettle cover through the first injection port and the second injection port respectively.

[0039] The present application provides a device and method for measuring the cement sheath interface bonding strength of high-temperature and high-pressure wells and thermal recovery wells, including: a hydrothermal autoclave, a casing pressure control system, a confining pressure control system, a first test system, a second test system, and an acoustic variable density logging system; the hydrothermal autoclave includes a kettle body, a formation model is arranged inside the kettle body, and a casing is arranged inside the formation model; a confining pressure chamber is formed between the formation model and the kettle body, and an annulus structure is formed between the casing and the formation model, and the annulus structure is used to form a cement sheath; the first interface of the cementing bonding surface is the interface between the cement sheath and the casing, and the second interface of the cementing bonding surface is the interface between the cement sheath and the formation model; the casing pressure control system includes a first pipeline and a second pipeline, and the first pipeline is connected to a heater; the confining pressure control system includes a third pipeline and a fourth pipeline; the first test system includes a fifth pipeline, a sixth pipeline, a seventh pipeline, and an eighth pipeline; pressure gauges are arranged on all the pipelines; the second test system includes a first pressure sensor and a second pressure sensor; the acoustic variable density logging system includes an ultrasonic component and an acoustic variable density logging tool, which are jointly used to detect the amplitude of the first wave of the casing wave in the casing and judge the bonding condition of the cementing bonding surface according to the amplitude. Through the above structural design, the following technical effects are achieved: the first pipeline is connected to the heater, and the temperature of the high-temperature gas injected into the first pipeline is adjusted by using an electric heater, and the temperature on the first pipeline is observed. Considering the actual temperature change range of the wellbore in the thermal recovery well, the temperature of the casing is increased from the initial formation temperature to the corresponding temperature of the wellbore when injecting hot steam. Considering the actual shut-in time of the thermal recovery well, the final temperature of the wellbore after shut-in, and the number of cycles, the system temperature reduction gradient, the final temperature, and the number of cycles are set to simulate the steam huff and puff process of the thermal recovery well, so as to measure the bonding strength of the cementing bonding surface under multiple cyclic temperature conditions of the thermal recovery well, overcoming the problem that the existing equipment for measuring the bonding strength of the cementing surface in thermal recovery wells cannot continuously measure the mechanical or hydraulic bonding strength; according to the actual situation of high-temperature and high-pressure gas wells, the influence of different temperatures and pressures on the bonding strength of the cementing bonding surface is simulated, so that the bonding strength of the cementing bonding surface under high-temperature conditions can be measured; the first test system is used to measure the hydraulic bonding strength of the cementing bonding surface, and the second test system is used to measure the mechanical bonding strength of the cementing bonding surface. By replacing different test systems, when measuring the hydraulic bonding strength of the cementing bonding surface under different temperature and pressure conditions, the mechanical bonding strength of the cementing bonding surface can be measured, providing a basis for measuring the bonding strength of the cementing bonding surface and solving the problem that the existing performance testing equipment for the cementing bonding surface cannot meet the measurement of mechanical bonding strength under high-temperature and high-pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments in line with this application, and are used together with the description to explain the principles of this application.

[0042] Figure 1 Structural schematic of the device for measuring the bonding strength of the cement sheath interface between high-temperature and high-pressure wells and thermal recovery wells provided by the embodiments of this application Figure 1 ;

[0043] Figure 2 Structural schematic of the device for measuring the bonding strength of the cement sheath interface between high-temperature and high-pressure wells and thermal recovery wells provided by the embodiments of this application Figure 2 .

[0044] Reference numerals:

[0045] 100 - Hydrothermal autoclave; 110 - Autoclave body; 200 - Casing pressure control system; 210 - First pipeline; 2101 - First constant-speed and constant-pressure pump; 2102 - First control valve; 220 - Second pipeline; 2201 - Second control valve; 300 - Confining pressure control system; 310 - Third pipeline; 3101 - Second constant-speed and constant-pressure pump; 3102 - Third control valve; 320 - Fourth pipeline; 3201 - Fourth control valve; 400 - First test system; 410 - Fifth pipeline; 4101 - Third constant-speed and constant-pressure pump; 4102 - Fifth control valve; 420 - Sixth pipeline; 4201 - Sixth control valve; 430 - Seventh pipeline; 4301 - Fourth constant-speed and constant-pressure pump; 4302 - Seventh control valve; 440 - Eighth pipeline; 4401 - Eighth control valve; 500 - Second test system; 510 - First pressure sensor; 520 - Second pressure sensor; 600 - Acoustic variable density logging system; 610 - Ultrasonic component; 620 - Acoustic variable density logging tool; 710 - Formation model; 720 - Casing; 730 - Confining pressure chamber; 740 - Cement sheath; 750 - First interface of the cementing bonding surface; 760 - Second interface of the cementing bonding surface; 770 - Heater; 810 - Casing pressure gas storage tank; 820 - Liquid injection tank; 830 - Waste liquid tank; 840 - First gas injection tank; 850 - First waste gas tank; 860 - Second gas injection tank; 870 - Second waste gas tank; 880 - Confining pressure chamber; 910 - Universal testing machine; 920 - Hydraulic press; 930 - Upper cement sheath pressure sensor; 940 - Lower cement sheath force transfer member; 950 - Upper cement sheath force transfer member; 960 - Casing force transfer member; 970 - First upper autoclave cover; 980 - Second upper autoclave cover; 990 - Upper sealing ring; 991 - Lower sealing ring. Detailed implementation manners

[0046] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the embodiments of the present invention.

[0047] In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items with basically the same functions and roles. Those skilled in the art can understand that the terms "first" and "second" do not limit the quantity and execution order, and the terms "first" and "second" do not necessarily mean different. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more.

[0048] It should be noted that "when... " in the embodiments of the present application can be at the instant when a certain situation occurs, or within a period of time after a certain situation occurs. The embodiments of the present application do not make specific limitations on this. In addition, a device for measuring the cement sheath interface bonding strength between a high-temperature and high-pressure well and a thermal recovery well provided in the embodiments of the present application is only an example, and the device for measuring the cement sheath interface bonding strength between a high-temperature and high-pressure well and a thermal recovery well may also include more or less content.

[0049] First, corresponding explanations are made for the nouns involved in the embodiments of the present application:

[0050] Cement sheath interface bonding strength: The cement sheath interface bonding strength refers to the bonding strength between the interface where the cement sheath contacts the casing and the interface where the cement sheath contacts the simulated formation, including the hydraulic bonding strength and mechanical bonding strength at the interface where the cement sheath contacts the casing, and the hydraulic bonding strength and mechanical bonding strength at the interface where the cement sheath contacts the simulated formation.

[0051] The first interface of the cementing bond surface: The autoclave includes a kettle body, and a formation model is arranged inside the kettle body. A casing is arranged inside the formation model. An annulus structure is formed between the casing and the formation model. When measuring the bond strength of the cementing bond surface, cement slurry is injected into the annulus structure to obtain a cement sheath. The first interface of the cementing bond surface is the interface between the cement sheath and the casing.

[0052] The second interface of the cementing bond surface: The autoclave includes a kettle body, and a formation model is arranged inside the kettle body. A casing is arranged inside the formation model. An annulus structure is formed between the casing and the formation model. When measuring the bond strength of the cementing bond surface, cement slurry is injected into the annulus structure to obtain a cement sheath. The second interface of the cementing bond surface is the interface between the cement sheath and the formation model.

[0053] To clearly understand the technical solutions of the embodiments of the present application, the solutions of the prior art will be introduced in detail first.

[0054] The prior art mainly focuses on the testing of normal temperature wells. An evaluation device for the bond strength of the cement sheath based on normal temperature wells has been developed, and the testing of the bond strength of the cement sheath under variable casing internal pressure conditions has been carried out, and the relevant measurement results have been reported. However, the evolution of the bond strength of the cementing bond surface under high temperature conditions and the cyclic temperature conditions of thermal recovery wells is not comprehensive enough.

[0055] Therefore, how to design a cement sheath interface bond strength measurement device that can measure the bond strength of the cementing bond surface under high temperature conditions and the cyclic temperature conditions of thermal recovery wells is an urgent problem to be solved in the embodiments of the present application.

[0056] Therefore, in view of the above technical problems existing in the prior art, the embodiments of the present application provide a device and method for measuring the bond strength of the cement sheath interface of high temperature and high pressure wells and thermal recovery wells, which can be used in the field of oil and gas field exploration and development, and are intended to measure the bond strength of the cementing bond surface under high temperature conditions and the cyclic temperature conditions of thermal recovery wells.

[0057] The application scenarios of a device and method for measuring the bond strength of the cement sheath interface of high temperature and high pressure wells and thermal recovery wells provided by the embodiments of the present application will be introduced below. The following application scenarios are only examples, aiming to help those skilled in the art understand the technical content of the embodiments of the present application, but it does not mean that the embodiments of the present application cannot be used in other devices, systems, environments or scenarios.

[0058] 1) Oil and gas extraction: During the extraction of oil and gas, especially in deep wells and high temperature environments, the cement sheath is used to fix the wellbore and protect the pipeline. The bond strength between the cement sheath and the well wall directly affects the stability of cementing. The device provided by the embodiments of the present application can measure the bond strength between the cement sheath and the well wall, and then analyze the cementing effect, ensure the stability of the wellbore, avoid the collapse of the well wall or fluid leakage, and ensure the safety and efficiency of the oil and gas production process.

[0059] 2) Downhole operations in high-temperature environments: In some high-temperature environments such as deep wells, geothermal wells, or deep oil and gas wells, the downhole temperature can reach several hundred degrees Celsius. The bonding strength of the cement sheath may decrease as the temperature rises. Therefore, it is crucial to test its performance under high-temperature conditions. The device provided by the embodiments of the present application can simulate the high-temperature environment under actual working conditions, thereby providing accurate bonding strength data to help optimize the selection of cementing materials and construction plans.

[0060] 3) Cyclic temperature conditions in thermal recovery wells: In thermal recovery operations such as the extraction of thermal oil and gas and geothermal energy, the wellbore will experience cyclic temperature changes. Such temperature changes have a certain impact on the bonding strength between the cement sheath and the wellbore wall, which may lead to a decrease in the bonding strength and further affect the cementing quality. The device provided by the embodiments of the present application can analyze the change in the bonding strength of the cement sheath under simulated cyclic temperature change conditions, thereby ensuring the long-term stability in thermal recovery well operations.

[0061] 4) Cementing quality analysis and repair: After the cementing process is completed, the bonding strength of the downhole cement sheath may be affected by factors such as temperature changes and pressure. Regularly using the device provided by the embodiments of the present application can detect the bonding strength of the cement sheath, timely discover defects in the cementing quality, provide a basis for subsequent repair or enhancement measures, and ensure the safety and effectiveness of downhole operations.

[0062] The embodiments of the present application will be introduced below with reference to the accompanying drawings of the specification.

[0063] Figure 1 Structural schematic of the device for measuring the bonding strength at the interface of the cement sheath in high-temperature and high-pressure wells and thermal recovery wells provided by the embodiments of the present application Figure 1 , Figure 2 Structural schematic of the device for measuring the bonding strength at the interface of the cement sheath in high-temperature and high-pressure wells and thermal recovery wells provided by the embodiments of the present application Figure 2 , such as Figure 1 and Figure 2 shown, the embodiments of the present application provide a device for measuring the bonding strength at the interface of the cement sheath in high-temperature and high-pressure wells and thermal recovery wells.

[0064] It includes a hydrothermal autoclave 100, a casing pressure control system 200, a confining pressure control system 300, a first test system 400, and a second test system 500.

[0065] The hydrothermal autoclave 100 includes a kettle body 110; a formation model 710 is arranged inside the kettle body 110, and a casing 720 is arranged inside the formation model 710.

[0066] In this embodiment, the kettle body 110 includes a cylindrical structure kettle wall and a lower kettle bottom. A formation model 710 is arranged inside the kettle body 110, and a casing 720 is arranged inside the formation model 710.

[0067] An annulus pressure chamber 730 is formed between the formation model 710 and the kettle body 110, and an annulus structure is formed between the casing 720 and the formation model 710. The annulus structure is used to form a cement sheath 740. The first interface 750 of the cementing interface is the interface between the cement sheath 740 and the casing 720, and the second interface 760 of the cementing interface is the interface between the cement sheath 740 and the formation model 710.

[0068] In this embodiment, optionally, the outer wall of the formation model 710 is wrapped in a high-temperature resistant rubber sleeve, and the annulus pressure chamber 730 is formed between the high-temperature resistant rubber sleeve and the inner wall of the kettle body 110.

[0069] An annulus structure is formed between the casing 720 and the formation model 710. When measuring the cementing strength of the cementing interface, first, prepare the cement slurry for the experiment, and then inject the prepared cement slurry into the annulus structure to form the cement sheath 740. Among them, the interface between the cement sheath 740 and the casing 720 is the first interface 750 of the cementing interface, and the interface between the cement sheath 740 and the formation model 710 is the second interface 760 of the cementing interface.

[0070] The casing pressure control system 200 includes a first pipeline 210 and a second pipeline 220, and the first pipeline 210 is connected to the heater 770.

[0071] In this embodiment, the first pipeline 210 and the second pipeline 220 are jointly used to adjust the pressure applied to the casing 720.

[0072] Specifically, the casing pressure control system 200 is used to apply the internal pressure of the casing 720, including a first pipeline 210 and a second pipeline 220, and the first pipeline 210 is connected to the heater 770. Among them, the first pipeline 210 is the inlet pipeline of the casing pressure control system 200, and the second pipeline 220 is the outlet pipeline of the casing pressure control system 200. By injecting high-temperature and high-pressure gas into the first pipeline 210, the pressure applied to the casing 720 can be adjusted. Two casing pressure sensors are installed to monitor the internal pressure of the casing 720.

[0073] The first pipeline is connected to the heater. The temperature of the high-temperature gas injected into the first pipeline is adjusted by the electric heater. Observe the temperature on the first pipeline. Considering the actual temperature change range of the wellbore in the thermal recovery well, the temperature of the casing is increased from the initial formation temperature to the corresponding temperature of the wellbore when injecting thermal steam. Considering the actual soaking time of the thermal recovery well, the final temperature of the wellbore after soaking and the number of cycles, set the temperature reduction gradient, the final temperature and the number of cycles of the system, simulate the steam huff and puff process of the thermal recovery well, so as to measure the cementing strength of the cementing interface of the thermal recovery well under multiple cyclic temperature conditions, overcoming the problem that the existing equipment for measuring the strength of the cementing interface in thermal recovery wells cannot continuously measure the mechanical or hydraulic cementing strength.

[0074] The confining pressure control system 300 includes a third pipeline 310 and a fourth pipeline 320.

[0075] In this embodiment, the third pipeline 310 and the fourth pipeline 320 are jointly used to adjust the pressure applied to the confining pressure chamber 730.

[0076] Specifically, the confining pressure control system 300 for applying confining pressure includes a third pipeline 310 and a fourth pipeline 320. Among them, the third pipeline 310 is the inlet pipeline of the confining pressure control system 300, and the fourth pipeline 320 is the outlet pipeline of the confining pressure control system 300. By injecting high-pressure liquid into the third pipeline 310, the function of adjusting the pressure applied to the confining pressure chamber 730 can be achieved. Two confining pressure sensors are installed to monitor the pressure applied to the confining pressure chamber 730.

[0077] The first test system 400 includes a fifth pipeline 410, a sixth pipeline 420, a seventh pipeline 430, and an eighth pipeline 440.

[0078] In this embodiment, the fifth pipeline 410 and the sixth pipeline 420 are jointly used to adjust the pressure applied to the first interface 750 of the cementing interface, and the seventh pipeline 430 and the eighth pipeline 440 are jointly used to adjust the pressure applied to the second interface 760 of the cementing interface.

[0079] Specifically, the first test system 400 for measuring the hydraulic cementing strength of the cementing interface includes a fifth pipeline 410, a sixth pipeline 420, a seventh pipeline 430, and an eighth pipeline 440. Among them, the fifth pipeline 410 is the inlet pipeline of the first interface 750 of the cementing interface, the sixth pipeline 420 is the outlet pipeline of the first interface 750 of the cementing interface, the seventh pipeline 430 is the inlet pipeline of the second interface 760 of the cementing interface, and the eighth pipeline 440 is the outlet pipeline of the second interface 760 of the cementing interface. By injecting high-temperature and high-pressure gas into the fifth pipeline 410, the function of adjusting the pressure applied to the first interface 750 of the cementing interface can be achieved; by injecting high-temperature and high-pressure gas into the seventh pipeline 430, the function of adjusting the pressure applied to the second interface 760 of the cementing interface can be achieved. Two pressure sensors are installed to monitor the pressure applied to the first interface 750 of the cementing interface, and two pressure sensors are installed to monitor the pressure applied to the second interface 760 of the cementing interface. According to the actual situation of the high-temperature and high-pressure gas well, the influence of different temperatures and pressures on the cementing strength of the cementing interface is simulated, so as to measure the cementing strength of the cementing interface under high-temperature conditions.

[0080] Pressure gauges are provided on all the pipelines.

[0081] In this embodiment, specifically, pressure gauges are provided on the first pipeline 210, the second pipeline 220, the third pipeline 310, the fourth pipeline 320, the fifth pipeline 410, the sixth pipeline 420, the seventh pipeline 430, and the eighth pipeline 440. Each pressure gauge is used to measure the pressure value on the corresponding pipeline.

[0082] The second test system 500 includes a first pressure sensor 510 and a second pressure sensor 520.

[0083] In this embodiment, the first pressure sensor 510 is used to monitor the pressure applied to the first interface 750 of the cementing interface, and the second pressure sensor 520 is used to monitor the pressure applied to the second interface 760 of the cementing interface.

[0084] Specifically, the second test system 500 is used to measure the mechanical bonding strength of the cementing interface, including a first pressure sensor 510 and a second pressure sensor 520. Among them, the first pressure sensor 510 is a sensor for monitoring the pressure applied to the first interface 750 of the cementing interface, and the second pressure sensor 520 is a sensor for monitoring the pressure applied to the second interface 760 of the cementing interface.

[0085] Optionally, in this embodiment, the mechanical bonding strength of the cementing interface is measured by the second test system 500, a universal pressure testing machine 910, a hydraulic press 920, an upper cement ring pressure sensor 930, a lower cement ring force transfer member 940, an upper cement ring force transfer member 950, and a casing force transfer member 960.

[0086] The first test system is used to measure the hydraulic bonding strength of the cementing interface, and the second test system is used to measure the mechanical bonding strength of the cementing interface. By replacing different test systems, when measuring the hydraulic bonding strength of the cementing interface under different temperature and pressure conditions, the mechanical bonding strength of the cementing interface can be measured, providing a basis for measuring the bonding strength of the cementing interface, and solving the problem that the existing performance testing equipment for the cementing interface cannot meet the measurement of the mechanical bonding strength under high temperature and high pressure conditions.

[0087] Optionally, in this embodiment, the first test system 400 is connected to the first upper kettle cover 970, and the second test system 500 is connected to the second upper kettle cover 980. When measuring the bonding strength of the cement ring interface, an upper sealing ring 990 and a lower sealing ring 991 are also provided, both of which are used to seal off the first interface of the cementing interface and the second interface of the cementing interface to prevent gas invasion.

[0088] The acoustic variable density logging system 600 includes an ultrasonic component 610 and an acoustic variable density logging tool 620, which are jointly used to detect the first arrival amplitude of the casing wave in the casing 720 and judge the bonding condition of the cementing interface according to the amplitude.

[0089] In this embodiment, the ultrasonic component 610 is turned on, and the first wave amplitude of the casing wave in the casing 720 is measured in real time by using the acoustic variable density logging tool 620, and the cementing condition of the cementing interface is judged according to the amplitude.

[0090] The present application provides a device for measuring the cementing strength of the interface between the cement sheath of a high-temperature and high-pressure well and a thermal recovery well, including: a hydrothermal autoclave, a casing pressure control system, an confining pressure control system, a first test system, a second test system, and an acoustic variable density logging system; the hydrothermal autoclave includes a kettle body, in which a formation model is arranged, and a casing is arranged in the formation model; a confining pressure chamber is formed between the formation model and the kettle body, and an annulus structure is formed between the casing and the formation model, and the annulus structure is used to form a cement sheath. The first interface of the cementing interface is the interface between the cement sheath and the casing, and the second interface of the cementing interface is the interface between the cement sheath and the formation model; the casing pressure control system includes a first pipeline and a second pipeline, and the first pipeline is connected to a heater; the confining pressure control system includes a third pipeline and a fourth pipeline; the first test system includes a fifth pipeline, a sixth pipeline, a seventh pipeline, and an eighth pipeline; pressure gauges are arranged on the pipelines; the second test system includes a first pressure sensor and a second pressure sensor; the acoustic variable density logging system includes an ultrasonic component and an acoustic variable density logging tool, which are jointly used to detect the first wave amplitude of the casing wave in the casing and judge the cementing condition of the cementing interface according to the amplitude. Through the above structural design, the following technical effects are achieved: the first pipeline is connected to the heater, and the temperature of the high-temperature gas injected into the first pipeline is adjusted by using the electric heater, and the temperature on the first pipeline is observed. Considering the temperature change range of the actual thermal recovery wellbore, the temperature of the casing is increased from the initial formation temperature to the corresponding temperature of the wellbore when injecting hot steam. Considering the shut-in time of the actual thermal recovery well, the final temperature of the wellbore after shut-in, and the number of cycles, the temperature reduction gradient, the final temperature, and the number of cycles of the system are set to simulate the steam stimulation process of the thermal recovery well, so as to measure the cementing strength of the cementing interface of the thermal recovery well under multiple cyclic temperature conditions, overcoming the problem that the existing equipment for measuring the cementing strength of the thermal recovery well interface cannot continuously measure the mechanical or hydraulic cementing strength; according to the actual situation of high-temperature and high-pressure gas wells, the influence of different temperatures and pressures on the cementing strength of the cementing interface is simulated, so as to measure the cementing strength of the cementing interface under high-temperature conditions; the first test system is used to measure the hydraulic cementing strength of the cementing interface, and the second test system is used to measure the mechanical cementing strength of the cementing interface. By replacing different test systems, when measuring the hydraulic cementing strength of the cementing interface under different temperature and pressure conditions, the mechanical cementing strength of the cementing interface can be measured, providing a basis for measuring the cementing strength of the cementing interface and solving the problem that the existing performance test equipment for the cementing interface cannot meet the measurement of mechanical cementing strength under high-temperature and high-pressure conditions.

[0091] In a possible design, on the basis of the above embodiment, the embodiment of the present application provides a device for measuring the cementing strength of the interface between the cement sheath of a high-temperature and high-pressure well and a thermal recovery well.

[0092] The formation model 710 is cylindrical in shape; a wellbore is provided at the central position of the formation model 710, and the casing 720 is disposed in the wellbore.

[0093] In this embodiment, the formation model 710 has a cylindrical structure, a wellbore is provided in the center thereof, and the casing 720 is disposed in the wellbore.

[0094] An ultrasonic component 610 is provided at the central position of the casing 720, and the ultrasonic component 610 is connected to the acoustic variable density logging tool 620.

[0095] In this embodiment, the ultrasonic component 610 and the acoustic variable density logging tool 620 are used to measure the attenuation value and amplitude of the casing wave in the circumferential azimuth of the wellbore. The usage methods and effects of the ultrasonic component 610 and the acoustic variable density logging tool 620 in this embodiment are similar to those of the ultrasonic component 610 and the acoustic variable density logging tool 620 in the above embodiment, and will not be elaborated herein.

[0096] Based on the above embodiment, an apparatus for measuring the bonding strength of the cement sheath interface of a high-temperature and high-pressure well and a thermal recovery well is provided in an embodiment of the present application.

[0097] A first constant-speed and constant-pressure pump 2101 and a first control valve 2102 are further provided on the first pipeline 210, and a second control valve 2201 is further provided on the second pipeline 220; the first pipeline 210 is connected to the casing pressure gas storage tank 810 through the heater 770, and the second pipeline 220 is connected to the casing pressure gas storage tank 810.

[0098] In this embodiment, the first constant-speed and constant-pressure pump 2101 and the first control valve 2102 are a constant-speed and constant-pressure pump and a control valve provided on the first pipeline 210, and the second control valve 2201 is a control valve provided on the second pipeline 220. The first constant-speed and constant-pressure pump 2101 is used to maintain the stability of the gas flow rate and pressure introduced into the first pipeline 210. The advantage of such a setting is that the stable output of the system flow rate and pressure is achieved through the automatic adjustment of the pump, and it is not affected by the change of the external system demand; the first control valve 2102 is used to control the flow rate of the gas introduced into the first pipeline 210, and the second control valve 2201 is used to control the flow rate of the gas in the second pipeline 220. The advantage of such a setting is that the precise control of the gas flow rate is achieved through the control valve, and it can ensure that the gas flow rate in the pipeline meets the design requirements of the system; the casing pressure gas storage tank 810 is used to discharge high-temperature gas. The function and effect of the second control valve 2201 are similar to those of the first control valve 2102, and will not be elaborated herein.

[0099] Based on the above embodiment, an apparatus for measuring the bonding strength of the cement sheath interface of a high-temperature and high-pressure well and a thermal recovery well is provided in an embodiment of the present application.

[0100] A second constant-speed and constant-pressure pump 3101 and a third control valve 3102 are also provided on the third pipeline 310, and a fourth control valve 3201 is also provided on the fourth pipeline 320; the third pipeline 310 is connected to the liquid injection tank 820, and the fourth pipeline 320 is connected to the waste liquid tank 830.

[0101] In this embodiment, the second constant-speed and constant-pressure pump 3101 and the third control valve 3102 are a constant-speed and constant-pressure pump and a control valve provided on the third pipeline 310, and the fourth control valve 3201 is a control valve provided on the fourth pipeline 320. The second constant-speed and constant-pressure pump 3101 is used to maintain the stability of the liquid flow rate and pressure in the third pipeline 310, the third control valve 3102 is used to control the flow rate of the liquid introduced into the third pipeline 310, the fourth control valve 3201 is used to control the flow rate of the liquid in the fourth pipeline 320, the liquid injection tank 820 is used to discharge high-temperature liquid, and the waste liquid tank 830 is used to collect high-temperature liquid. The effects of the constant-speed and constant-pressure pump and the control valve in this embodiment are similar to those of the constant-speed and constant-pressure pump and the control valve in the above embodiment, and will not be elaborated here.

[0102] Based on the above embodiments, an embodiment of the present application provides a device for measuring the bonding strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well.

[0103] A third constant-speed and constant-pressure pump 4101 and a fifth control valve 4102 are also provided on the fifth pipeline 410, and a sixth control valve 4201 is also provided on the sixth pipeline 420; the fifth pipeline 410 is connected to the first gas injection tank 840, and the sixth pipeline 420 is connected to the first waste gas tank 850.

[0104] In this embodiment, the third constant-speed and constant-pressure pump 4101 and the fifth control valve 4102 are a constant-speed and constant-pressure pump and a control valve provided on the fifth pipeline 410, and the sixth control valve 4201 is a control valve provided on the sixth pipeline 420. The third constant-speed and constant-pressure pump 4101 is used to maintain the stability of the gas flow rate and pressure in the fifth pipeline 410, the fifth control valve 4102 is used to control the flow rate of the gas introduced into the fifth pipeline 410, the sixth control valve 4201 is used to control the flow rate of the gas in the sixth pipeline 420, the first gas injection tank 840 is used to discharge high-temperature gas, and the first waste gas tank 850 is used to collect high-temperature gas. The effects of the constant-speed and constant-pressure pump and the control valve in this embodiment are similar to those of the constant-speed and constant-pressure pump and the control valve in the above embodiment, and will not be elaborated here.

[0105] Based on the above embodiments, an embodiment of the present application provides a device for measuring the bonding strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well.

[0106] A fourth constant-speed and constant-pressure pump 4301 and a seventh control valve 4302 are further provided on the seventh pipeline 430, and an eighth control valve 4401 is further provided on the eighth pipeline 440; the seventh pipeline 430 is connected to the second gas injection tank 860, and the eighth pipeline 440 is connected to the second waste gas tank 870.

[0107] In this embodiment, the fourth constant-speed and constant-pressure pump 4301 and the seventh control valve 4302 are a constant-speed and constant-pressure pump and a control valve provided on the seventh pipeline 430, and the eighth control valve 4401 is a control valve provided on the eighth pipeline 440. The fourth constant-speed and constant-pressure pump 4301 is used to maintain the stability of the gas flow rate and pressure in the seventh pipeline 430, the seventh control valve 4302 is used to control the gas flow rate in the seventh pipeline 430, the eighth control valve 4401 is used to control the gas flow rate in the eighth pipeline 440, the second gas injection tank 860 is used to discharge high-temperature gas, and the second waste gas tank 870 is used to collect high-temperature gas. The effects of the constant-speed and constant-pressure pump and the control valve in this embodiment are similar to those of the constant-speed and constant-pressure pump and the control valve in the above embodiment, and will not be elaborated here.

[0108] Based on the above embodiments, an apparatus for measuring the bonding strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well is provided in an embodiment of the present application.

[0109] One end of each of the first pipeline 210 and the second pipeline 220 passes through the kettle body 110 and is placed in the casing pressure chamber 880, and the other end of each of the first pipeline 210 and the second pipeline 220 is connected to the casing pressure gas storage tank 810.

[0110] In this embodiment, a casing pressure flow outlet, an annulus pressure flow outlet, a first interface flow outlet of the cementing interface, a second interface flow outlet of the cementing interface, and a lower sealing ring are provided at the lower end of the kettle body 110. The casing pressure flow outlet is communicated with the casing pressure chamber 880, the annulus pressure flow outlet is communicated with the annulus pressure chamber 730, the first interface flow outlet of the cementing interface is communicated with the first interface 750 of the cementing interface, the second interface flow outlet of the cementing interface is communicated with the second interface 760 of the cementing interface, and the lower sealing ring is used to seal off the first interface and the second interface of the cementing interface to prevent gas invasion.

[0111] One end of the first pipeline 210 passes through the casing pressure injection port and extends into the kettle body 110 and is placed in the casing pressure chamber 880, and the other end of the first pipeline 210 is connected to the casing pressure gas storage tank 810; one end of the second pipeline 220 passes through the casing pressure flow outlet and extends into the kettle body 110 and is placed in the casing pressure chamber 880, and the other end of the second pipeline 220 is connected to the casing pressure gas storage tank 810.

[0112] One end of each of the third pipeline 310 and the fourth pipeline 320 passes through the kettle body 110 and is placed in the annulus pressure chamber 730. The other end of the third pipeline 310 is connected to the liquid injection tank 820, and the other end of the fourth pipeline 320 is connected to the waste liquid tank 830.

[0113] In this embodiment, one end of the third pipeline 310 penetrates through the confining pressure injection port and extends into the autoclave body 110, and is placed inside the confining pressure chamber 730. The other end of the third pipeline 310 is connected to the liquid injection tank 820. One end of the fourth pipeline 320 penetrates through the confining pressure flow outlet and extends into the autoclave body 110, and is placed inside the confining pressure chamber 730. The other end of the fourth pipeline 320 is connected to the waste liquid tank 830.

[0114] One end of each of the fifth pipeline 410 and the sixth pipeline 420 passes through the autoclave body 110 and is placed inside the annulus structure. The other end of the fifth pipeline 410 is connected to the first gas injection tank 840, and the other end of the sixth pipeline 420 is connected to the first waste gas tank 850.

[0115] In this embodiment, one end of the fifth pipeline 410 penetrates through the first interface injection port of the cement sheath of the well cementing interface and extends into the autoclave body 110, and is placed inside the annulus structure. The other end of the fifth pipeline 410 is connected to the first gas injection tank 840. One end of the sixth pipeline 420 penetrates through the first interface flow outlet of the cement sheath of the well cementing interface and extends into the autoclave body 110, and is placed inside the annulus structure. The other end of the sixth pipeline 420 is connected to the first waste gas tank 850.

[0116] One end of each of the seventh pipeline 430 and the eighth pipeline 440 passes through the autoclave body 110 and is placed inside the annulus structure. The other end of the seventh pipeline 430 is connected to the second gas injection tank 860, and the other end of the eighth pipeline 440 is connected to the second waste gas tank 870.

[0117] In this embodiment, one end of the seventh pipeline 430 penetrates through the second interface injection port of the cement sheath of the well cementing interface and extends into the autoclave body 110, and is placed inside the annulus structure. The other end of the seventh pipeline 430 is connected to the second gas injection tank 860. One end of the eighth pipeline 440 penetrates through the second interface flow outlet of the cement sheath of the well cementing interface and extends into the autoclave body 110, and is placed inside the annulus structure. The other end of the eighth pipeline 440 is connected to the second waste gas tank 870.

[0118] This embodiment provides a method for measuring the bonding strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well. This method is used for the device for measuring the bonding strength of the cement sheath interface between a high-temperature and high-pressure well and a thermal recovery well provided in the above embodiment. The device includes: a hydrothermal autoclave and a casing pressure control system. Among them, the hydrothermal autoclave includes an autoclave body, a formation model is arranged inside the autoclave body, and a casing is arranged inside the formation model. The casing pressure control system includes a first pipeline, the first pipeline is connected to a heater, an annulus structure is formed between the casing and the formation model, and the annulus structure is used to form a cement sheath. The first interface of the well cementing interface is the interface between the cement sheath and the casing, and the second interface of the well cementing interface is the interface between the cement sheath and the formation model. Then this method includes:

[0119] S101. Adjust the temperature condition of the first pipeline through a heater, and test the hydraulic bonding strength of the first interface of the cementing interface, the hydraulic bonding strength of the second interface of the cementing interface, the mechanical bonding strength of the first interface of the cementing interface, and the mechanical bonding strength of the second interface of the cementing interface under different temperature conditions.

[0120] In this embodiment, the temperature conditions include high-temperature conditions and cyclic temperature conditions. The high-temperature condition is a condition higher than the preset temperature.

[0121] Based on the above embodiment, an embodiment of the present application provides a method for measuring the bonding strength of the cement sheath interface of a high-temperature and high-pressure well and a thermal recovery well. The cement sheath interface bonding strength measuring device further includes a second test system. The first test system in the device further includes a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, and a pressure gauge provided on each pipeline; wherein, the second test system includes a first pressure sensor and a second pressure sensor.

[0122] Inject cement slurry into the annulus structure to obtain a cement sheath; when determining the temperature preset value according to the high-temperature condition, set the curing temperature of the cement sheath as the temperature preset value; when determining the temperature preset value according to the cyclic temperature condition, adjust the gas temperature in the first pipeline to the temperature preset value through a heater.

[0123] In this embodiment, prepare the cement slurry used in the experiment, and then inject the prepared cement slurry into the annulus structure to form a cement sheath.

[0124] After determining the temperature preset value according to the high-temperature condition, on the basis of conducting a normal-temperature test, further measure the bonding strength of the cementing interface of the high-temperature well at different temperatures. At this time, it is necessary to set the curing temperature of the cement sheath as the temperature preset value, that is, set the curing temperature of the cement sheath as the temperature of the required high-temperature well. Then S101 specifically includes the following steps:

[0125] S201. Record the initial reading of the pressure gauge on the fifth pipeline, apply pressure to the fifth pipeline, stop applying pressure to the fifth pipeline when the reading of the pressure gauge on the sixth pipeline starts to increase, and when the reading of the pressure gauge on the sixth pipeline is equal to the reading of the pressure gauge on the fifth pipeline, obtain the hydraulic bonding strength of the first interface of the cementing interface at the temperature preset value according to the difference between the reading of the pressure gauge on the sixth pipeline and the reading of the pressure gauge on the fifth pipeline when the last pressure increase value changes.

[0126] In this embodiment, S201 includes the following steps:

[0127] S2011. Open the fifth control valve and the sixth control valve, adjust the third constant-speed and constant-pressure pump, inject gas into the injection port of the first interface of the cementing interface through the fifth pipeline, and record the initial reading P of the pressure gauge on the fifth pipeline 1, combined with the reading of the pressure gauge on the fifth pipeline, the pressure of the gas in the fifth pipeline is increased successively by 0.5 MPa. After each increase in the gas pressure value, it is left standing for more than 10 minutes. The readings of the pressure gauges on the fifth pipeline and the sixth pipeline are observed in real time to obtain the pressure change at the first interface flow outlet of the cementing interface. When the reading of the pressure gauge on the sixth pipeline remains unchanged, it indicates that the first interface of the cementing interface can withstand the pressure difference between the inlet end and the outlet end.

[0128] S2012. Continue to introduce gas into the fifth pipeline, pressurize the injection port of the first interface of the cementing interface according to the pressure increase value of 0.5 MPa each time, so that the pressure difference between the injection port of the first interface of the cementing interface and the first interface flow outlet of the cementing interface gradually increases. Observe the reading of the pressure gauge on the sixth pipeline in real time. When the reading of the pressure gauge on the sixth pipeline starts to increase, stop pressurizing the first interface of the cementing interface and leave it standing for observation for 10 minutes.

[0129] S2013. As the pressure difference between the injection port of the first interface of the cementing interface and the first interface flow outlet of the cementing interface continues to increase, when the value of the pressure gauge on the sixth pipeline suddenly increases to the value of the pressure gauge on the fifth pipeline, it indicates that the first interface of the cementing interface has debonded. Record the value Pi of the pressure gauge on the fifth pipeline when the last pressure increase value changed 1 and the value Po of the pressure gauge on the sixth pipeline 1 , calculate Po 1 and Pi 1 The difference between them is obtained to get the maximum sealing pressure difference that the first interface of the cementing interface can withstand when debonding, that is, the hydraulic bonding strength of the first interface of the cementing interface under high temperature conditions. At the same time, the logging results measured by the acoustic variable density logging tool are used to synchronously observe the debonding phenomenon between the casing and the cement sheath.

[0130] S202. Record the initial reading of the pressure gauge on the seventh pipeline, apply pressure to the seventh pipeline, and stop applying pressure to the seventh pipeline when the reading of the pressure gauge on the eighth pipeline starts to increase. When the reading of the pressure gauge on the eighth pipeline is equal to the reading of the pressure gauge on the seventh pipeline, the hydraulic bonding strength of the second interface of the cementing interface under the preset temperature value is obtained according to the difference between the reading of the pressure gauge on the eighth pipeline and the reading of the pressure gauge on the seventh pipeline when the last pressure increase value changed.

[0131] In this embodiment, S202 includes the following steps:

[0132] S2021. Open the seventh control valve and the eighth control valve, adjust the fourth constant speed and constant pressure pump, and use the seventh pipeline to inject gas into the injection port of the second interface of the cementing interface. Record the initial reading P of the pressure gauge on the seventh pipeline 2, combined with the reading of the pressure gauge on the seventh pipeline, the pressure of the gas in the seventh pipeline is increased by 0.5 MPa in sequence. After each increase in the gas pressure value, it is left standing for more than 10 minutes. The readings of the pressure gauge on the seventh pipeline and the pressure gauge on the eighth pipeline are observed in real time to obtain the pressure change at the flow outlet of the second interface of the cementing interface. When the reading of the pressure gauge on the eighth pipeline remains unchanged, it indicates that the second interface of the cementing interface can withstand the pressure difference between the inlet end and the outlet end.

[0133] S2022. Continue to introduce gas into the seventh pipeline, and pressurize the injection port of the second interface of the cementing interface according to the pressure increase value of 0.5 MPa each time, so that the pressure difference between the injection port of the second interface of the cementing interface and the flow outlet of the second interface of the cementing interface gradually increases. Observe the reading of the pressure gauge on the eighth pipeline in real time. When the reading of the pressure gauge on the eighth pipeline starts to increase, stop pressurizing the second interface of the cementing interface and observe it for 10 minutes while leaving it standing.

[0134] S2023. As the pressure difference between the injection port of the second interface of the cementing interface and the flow outlet of the second interface of the cementing interface continues to increase, when the reading of the pressure gauge on the eighth pipeline suddenly increases to the reading of the pressure gauge on the seventh pipeline, it indicates that the second interface of the cementing interface has debonded. Record the reading Pi of the pressure gauge on the seventh pipeline when the last pressure increase value changed 2 and the reading Po of the pressure gauge on the eighth pipeline 2 , calculate Po 2 and Pi 2 The difference between them is obtained to get the maximum sealing pressure difference that the second interface of the cementing interface can withstand when debonding, that is, the hydraulic bonding strength of the second interface of the cementing interface under high-temperature conditions is obtained. At the same time, the logging results measured by the acoustic variable density logging tool are used to synchronously observe the debonding phenomenon between the formation model and the cement sheath.

[0135] S203. Apply pressure to the casing and observe the value of the first pressure sensor in real time. When the cement sheath is separated from the casing, the mechanical bonding strength of the first interface of the cementing interface at the preset temperature value is obtained according to the value of the first pressure sensor when the last pressure increase value changed.

[0136] In this embodiment, S203 includes the following steps:

[0137] S2031. Turn on the universal pressure testing machine, adjust the pressure applied to the lower part of the cement sheath through the force transmission member installed at the lower part of the cement sheath, that is, the lower cement sheath force transmission member. Turn on the hydraulic press and apply the same pressure as the force transmission member installed at the lower part of the cement sheath through the force transmission member installed at the upper part of the cement sheath, that is, the upper cement sheath force transmission member, to prevent the cement sheath from sliding when measuring the mechanical bonding strength of the first interface of the cementing interface.

[0138] S2032. A force transmission member, i.e., a casing force transmission member, is installed at the lower part of the casing. The first pressure sensor is installed on this force transmission member. The reading of the first pressure sensor is used to gradually increase the pressure applied to the casing at a loading amplitude of 0.5 MPa, and the reading of the first pressure sensor is observed in real time to obtain the pressure change of the first interface of the cementing interface.

[0139] S2033. As the pressure on the first interface of the cementing interface continues to increase, when the casing moves away from the top of the cement sheath to the upper end, it indicates that the casing and the cement sheath have separated. Record the pressure applied when the last pressure increase value changes to obtain the mechanical bonding strength of the first interface of the cementing interface, that is, obtain the mechanical bonding strength of the first interface of the cementing interface under high-temperature conditions. At the same time, use the logging results obtained by measuring with an acoustic variable density logging tool to synchronously observe the separation phenomenon between the casing and the cement sheath.

[0140] Each system in this embodiment is connected to a computer.

[0141] S204. Apply pressure to the cement sheath and observe the value of the second pressure sensor in real time. When the cement sheath separates from the formation model, obtain the mechanical bonding strength of the second interface of the cementing interface at the preset temperature according to the value of the second pressure sensor when the last pressure increase value changes.

[0142] In this embodiment, S204 includes the following steps:

[0143] S2041. Turn off the hydraulic press and release the pressure applied to the upper end of the cement sheath.

[0144] S2042. Restart the universal testing machine. Through the force transmission member installed at the lower part of the cement sheath, combined with the reading of the second pressure sensor installed on this force transmission member, gradually increase the pressure applied to the cement sheath at a loading amplitude of 0.5 MPa, and observe the reading of the second pressure sensor in real time to obtain the pressure change of the second interface of the cementing interface.

[0145] S2043. As the pressure on the second interface of the cementing interface continues to increase, when the cement sheath moves away from the top of the formation model to the upper end, it indicates that the cement sheath and the formation model have separated. Record the pressure applied when the last pressure increase value changes to obtain the mechanical bonding strength of the second interface of the cementing interface, that is, obtain the mechanical bonding strength of the second interface of the cementing interface under high-temperature conditions. At the same time, use the logging results obtained by measuring with an acoustic variable density logging tool to synchronously observe the separation phenomenon between the cement sheath and the formation model.

[0146] After determining the temperature preset value according to the cyclic temperature conditions, the cementing bond strength of the cementing interface of the thermal recovery well under multiple cyclic temperature conditions is measured. After simulating the curing process of the cement sheath and determining the solidification state of the cement sheath, if the strength of the cement sheath no longer changes, the temperature of the high-temperature gas flowing out of the casing pressure storage tank is adjusted by an electric heater, and the reading of the temperature sensor on the first pipeline is observed. Considering the actual temperature change range of the thermal recovery wellbore, the casing temperature is increased from the initial formation temperature to the corresponding temperature of the wellbore when injecting hot steam. Considering the actual shut-in time of the thermal recovery well, the final temperature of the wellbore after shut-in and the number of cycles, the system temperature reduction gradient, the final temperature and the number of cycles are set. At the same time, a sonic variable density logging tool is used for measurement, and the strength change of the cement sheath is observed synchronously under the conditions of different temperature changes and the number of cycles. At this time, S101 includes S201, S202, S203 and S204. Among them, S201 includes S2011, S2012 and S2013, and finally the hydraulic bond strength of the first interface of the cementing interface under the set cyclic temperature conditions is obtained through S2013; S202 includes S2021, S2022 and S2023, and finally the hydraulic bond strength of the second interface of the cementing interface under the set cyclic temperature conditions is obtained through S2023; S203 includes S2031, S2032 and S2033, and finally the mechanical bond strength of the first interface of the cementing interface under the set cyclic temperature conditions is obtained through S2033; S204 includes S2041, S2042 and S2043, and finally the mechanical bond strength of the second interface of the cementing interface under the set cyclic temperature conditions is obtained through S2043. The contents of S201, S202, S203, S204, S2011, S2012, S2013, S2021, S2022, S2023, S2031, S2032, S2033, S2041, S2042 and S2043 have been specifically described above and will not be elaborated here.

[0147] A method for measuring the cement sheath interface bond strength of a high-temperature and high-pressure well and a thermal recovery well provided in this embodiment can implement the method for measuring the cement sheath interface bond strength of a high-temperature and high-pressure well and a thermal recovery well provided in the above embodiment, and its effect is the same as that of the method for measuring the cement sheath interface bond strength of a high-temperature and high-pressure well and a thermal recovery well provided in the above embodiment, which will not be elaborated here.

[0148] On the basis of the above embodiment, an embodiment of the present application provides a method for measuring the cement sheath interface bond strength of a high-temperature and high-pressure well and a thermal recovery well. The device for measuring the cement sheath interface bond strength of a high-temperature and high-pressure well and a thermal recovery well further includes a first upper kettle cover and a second upper kettle cover. The second upper kettle cover includes a concave structure. The first upper kettle cover is provided with a first injection port, a second injection port, a third injection port and a fourth injection port. The second upper kettle cover is provided with a fifth injection port and a sixth injection port.

[0149] Before performing S201, it further includes:

[0150] Install the first upper kettle cover, and connect the first pipeline, the third pipeline, the fifth pipeline, and the seventh pipeline to the first upper kettle cover through the first injection port, the second injection port, the third injection port, and the fourth injection port respectively.

[0151] The first upper kettle cover is also provided with an upper sealing ring, which is used to seal the first interface of the cementing surface and the second interface of the cementing surface of the well, preventing gas invasion.

[0152] After performing S202 but before performing S203, it further includes:

[0153] Replace the first upper kettle cover with the second upper kettle cover, and connect the first pipeline and the third pipeline to the second upper kettle cover through the first injection port and the second injection port respectively.

[0154] In this embodiment, the first injection port is the casing pressure injection port, the second injection port is the confining pressure injection port, the third injection port is the first interface injection port of the cementing surface of the well, and the fourth injection port is the second interface injection port of the cementing surface of the well. The top end of the kettle body is fixedly connected to the first upper kettle cover or the second upper kettle cover by bolts. The first upper kettle cover is used when measuring the hydraulic bonding strength, and the second upper kettle cover is used when measuring the mechanical bonding strength. By replacing different upper kettle covers, when measuring the hydraulic bonding strength of the cementing surface of the well under different temperature and pressure conditions, the mechanical bonding strength can be measured without removing the cement ring, solving the problem that the existing performance testing equipment for the cementing surface of the well cannot meet the measurement of the mechanical bonding strength under high temperature and high pressure conditions.

[0155] The following is the specific measurement method for the bonding strength of the cementing surface of the well at normal temperature:

[0156] S301. Prepare a formation model, which is in a cylindrical structure with a wellbore centered inside.

[0157] S302. Wrap the formation model in a high-temperature-resistant rubber sleeve and place it in the kettle body of the hydrothermal kettle. Then place the casing in the wellbore of the formation model in the center, and finally place the ultrasonic component in the center of the casing.

[0158] S303. Prepare the cement slurry used in the experiment.

[0159] S304. Inject the prepared cement slurry into the annulus structure to form a cement ring. Among them, the first interface of the cementing surface of the well is the interface between the cement ring and the casing, and the second interface of the cementing surface of the well is the interface between the cement ring and the formation model. Use the first upper kettle cover to seal the top end of the kettle body of the hydrothermal kettle, and install the casing pressure control system, the confining pressure control system, the first test system, and the acoustic variable density logging system in sequence.

[0160] S305. Pressurize the casing pressure chamber, confining pressure chamber, and annulus structure respectively to ensure that the autoclave has good sealing performance.

[0161] S306. After the pressure test is completed, turn on the casing pressure control system, pump high-pressure gas into the casing pressure chamber to simulate the internal pressure of the casing and the ground temperature, apply confining pressure to the confining pressure chamber, and apply annulus pressure to the annulus structure to simulate the curing process of the cement sheath. The specific steps are as follows:

[0162] S3061. Open the third control valve and the fourth control valve, adjust the second constant-speed constant-pressure pump, and inject high-pressure liquid into the confining pressure chamber through the third pipeline to simulate the in-situ stress received by the formation model. Observe the reading of the pressure gauge on the third pipeline in real time. When the reading of the pressure gauge on the third pipeline reaches the preset confining pressure value, close the third control valve, the fourth control valve, and the second constant-speed constant-pressure pump, stop injecting high-pressure liquid into the confining pressure chamber, and maintain the confining pressure value of the formation model.

[0163] S3062. Open the first control valve and the second control valve, adjust the first constant-speed constant-pressure pump, and inject high-temperature and high-pressure gas into the casing pressure chamber through the first pipeline to simulate the internal pressure of the casing and the normal well temperature. Observe the reading of the pressure gauge on the first pipeline and the reading of the temperature sensor installed on the first pipeline in real time. When the reading of the pressure gauge on the first pipeline reaches the preset internal pressure value of the casing and the reading of the temperature sensor installed on the first pipeline reaches the preset normal temperature value, continuously circulate the high-pressure gas under the current temperature and pressure conditions to maintain the pressure and temperature values of the casing.

[0164] S3063. Open the fifth control valve and the sixth control valve, adjust the third constant-speed constant-pressure pump, and inject high-pressure gas into the annulus structure through the fifth pipeline to simulate the internal pressure of the annulus structure. Observe the reading of the pressure gauge on the sixth pipeline in real time. When the reading of the pressure gauge on the sixth pipeline reaches the preset annulus pressure value, close the fifth control valve and the sixth control valve, stop injecting high-pressure liquid into the annulus structure, and maintain the annulus pressure value for pressure holding.

[0165] S307. Wait for more than 48 hours. After the cement slurry has solidified, turn on the ultrasonic component, use the acoustic variable density logging tool to measure the attenuation of the casing wave in real time, judge the strength change of the cement sheath according to the attenuation of the casing wave, determine the solidification state of the cement sheath, and start the cement sheath sealing performance test experiment after the strength of the cement sheath no longer changes.

[0166] S308. Execute S2011, S2012, and S2013. What is obtained through S2013 is the hydraulic bonding strength of the first interface of the cementing bond surface under normal temperature conditions; after executing S2013, execute S2021, S2022, and S2023. What is obtained through S2023 is the hydraulic bonding strength of the second interface of the cementing bond surface under normal temperature conditions.

[0167] S309. Without installing the first test system, replace the second upper kettle cover and install the second test system, and repeat S301 - S307 to re - simulate the same temperature - pressure environment as that when measuring the hydraulic bonding strength under normal temperature conditions.

[0168] S310. Execute S2031, S2032 and S2033. What is obtained through S2033 is the mechanical bonding strength of the first interface of the cementing bonding surface under normal temperature conditions; execute S2041, S2042 and S2043. What is obtained through S2043 is the mechanical bonding strength of the second interface of the cementing bonding surface under normal temperature conditions.

[0169] The following is the specific measurement method for the bonding strength of the cementing bonding surface of high - temperature wells under different temperature conditions:

[0170] S401. Execute S301 - S307, but in S306, set the curing temperature of the cement sheath to the temperature of the required high - temperature well.

[0171] S402. Execute S2011, S2012 and S2013. What is obtained through S2013 is the hydraulic bonding strength of the first interface of the cementing bonding surface under high - temperature conditions; after executing S2013, execute S2021, S2022 and S2023. What is obtained through S2023 is the hydraulic bonding strength of the second interface of the cementing bonding surface under high - temperature conditions.

[0172] S403. Without installing the first test system, replace the second upper kettle cover and install the second test system, and repeat S301 - S307 to re - simulate the temperature - pressure environment of the required high - temperature well.

[0173] S404. Execute S2031, S2032 and S2033. What is obtained through S2033 is the mechanical bonding strength of the first interface of the cementing bonding surface under high - temperature conditions; execute S2041, S2042 and S2043. What is obtained through S2043 is the mechanical bonding strength of the second interface of the cementing bonding surface under high - temperature conditions.

[0174] The following is the specific measurement method for the bonding strength of the cementing bonding surface of thermal - recovery wells under the set cyclic temperature conditions:

[0175] S501. Execute S301 - S307, but in S3062, simulate the internal pressure of the thermal - recovery well casing and the initial temperature of the actual formation of the thermal - recovery well.

[0176] S502. After the strength of the cement sheath no longer changes, use an electric heater to adjust the temperature of the high-temperature gas flowing out of the casing pressure storage tank, observe the readings of the temperature sensors installed on the first pipeline, consider the actual temperature change range of the hot production wellbore, increase the casing temperature from the initial formation temperature to the corresponding temperature of the wellbore when injecting hot steam, consider the shut-in time of the actual hot production well, the final temperature of the wellbore after shut-in, and the number of cycles, set the system temperature reduction gradient, the final temperature, and the number of cycles. At the same time, use an acoustic variable density logging tool for measurement, and synchronously observe the change in the strength of the cement sheath under different temperature changes and numbers of cycles.

[0177] S503. Execute S2011, S2012, and S2013. What is obtained through S2013 is the hydraulic bonding strength of the first interface of the cementing bond surface under the set cyclic temperature conditions; after executing S2013, execute S2021, S2022, and S2023. What is obtained through S2023 is the hydraulic bonding strength of the second interface of the cementing bond surface under the set cyclic temperature conditions.

[0178] S504. Do not install the first test system, replace the second upper kettle cover and install the second test system, repeat the execution of S301 - S307, and re-simulate and measure the same temperature and pressure environment as when measuring the hydraulic bonding strength under the set cyclic temperature conditions.

[0179] S505. Execute S2031, S2032, and S2033. What is obtained through S2033 is the mechanical bonding strength of the first interface of the cementing bond surface under the set cyclic temperature conditions; execute S2041, S2042, and S2043. What is obtained through S2043 is the mechanical bonding strength of the second interface of the cementing bond surface under the set cyclic temperature conditions.

[0180] Combined with the acoustic variable density logging results during the measurement, the bonding strength of the cementing bond surface was accurately measured. At the same time, an acoustic variable density logging tool was used to synchronously observe the change in the bonding strength of the cement sheath, overcoming the problem that the existing equipment for measuring the strength of the bonding surface of hot production wells cannot continuously measure the mechanical or hydraulic bonding strength.

[0181] So far, the technical solutions of the embodiments of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the embodiments of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for measuring the bonding strength of cement sheath interface in high temperature and high pressure wells and thermal recovery wells, characterized in that: include: A hydrothermal kettle (100), a casing pressure control system (200), a confining pressure control system (300), a first test system (400), a second test system (500), and an acoustic variable density logging system (600); The hydrothermal kettle (100) comprises a kettle body (110); a formation model (710) is arranged in the kettle body (110), and a casing (720) is arranged in the formation model (710); A confining pressure cavity (730) is formed between the formation model (710) and the kettle body (110), and an annular structure is formed between the casing (720) and the formation model (710), and the annular structure is used to form a cement ring (740); a first cementing surface interface (750) is an interface between the cement ring (740) and the casing (720), and a second cementing surface interface (760) is an interface between the cement ring (740) and the formation model (710); The casing pressure control system (200) comprises a first pipeline (210) and a second pipeline (220), wherein the first pipeline (210) is connected to a heater (770); the first pipeline (210) and the second pipeline (220) are used together to adjust the pressure applied to the casing (720); The confining pressure control system (300) comprises a third pipeline (310) and a fourth pipeline (320); the third pipeline (310) and the fourth pipeline (320) are used together to adjust the pressure applied to the confining pressure chamber (730); The first test system (400) comprises a fifth pipeline (410), a sixth pipeline (420), a seventh pipeline (430) and an eighth pipeline (440); the fifth pipeline (410) and the sixth pipeline (420) are used together to adjust the pressure applied to the first interface (750) of the cementing surface, and the seventh pipeline (430) and the eighth pipeline (440) are used together to adjust the pressure applied to the second interface (760) of the cementing surface; Each of the pipelines is provided with a pressure gauge; The second test system (500) comprises a first pressure sensor (510) and a second pressure sensor (520); the first pressure sensor (510) is used to monitor the pressure applied to the first interface (750) of the cementing surface, and the second pressure sensor (520) is used to monitor the pressure applied to the second interface (760) of the cementing surface; The acoustic variable density logging system (600) comprises an ultrasonic component (610) and an acoustic variable density logging instrument (620), which are used together to detect the amplitude of the casing head wave inside the casing (720) and to judge the bonding condition of the cementing surface according to the amplitude.

2. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 1 is characterized in that: The first pipeline (210) is also provided with a first constant speed constant pressure pump (2101) and a first control valve (2102), and the second pipeline (220) is also provided with a second control valve (2201); the first pipeline (210) is connected to the jacket pressure gas storage tank (810) via the heater (770), and the second pipeline (220) is connected to the jacket pressure gas storage tank (810).

3. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 2 is characterized in that: The third pipeline (310) is also provided with a second constant speed constant pressure pump (3101) and a third control valve (3102), and the fourth pipeline (320) is also provided with a fourth control valve (3201); the third pipeline (310) is connected to the liquid injection tank (820), and the fourth pipeline (320) is connected to the waste liquid tank (830).

4. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 3 is characterized in that: The fifth pipeline (410) is also provided with a third constant speed constant pressure pump (4101) and a fifth control valve (4102), and the sixth pipeline (420) is also provided with a sixth control valve (4201); the fifth pipeline (410) is connected to the first gas injection tank (840), and the sixth pipeline (420) is connected to the first waste gas tank (850).

5. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 4 is characterized in that: The seventh pipeline (430) is also provided with a fourth constant speed constant pressure pump (4301) and a seventh control valve (4302), and the eighth pipeline (440) is also provided with an eighth control valve (4401); the seventh pipeline (430) is connected to the second gas injection tank (860), and the eighth pipeline (440) is connected to the second exhaust gas tank (870).

6. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 5, characterized in that: One end of each of the first pipeline (210) and the second pipeline (220) passes through the kettle body (110) and is placed in the jacket pressure chamber (880), and the other end of each of the first pipeline (210) and the second pipeline (220) is connected to the jacket pressure gas storage tank (810); One end of each of the third pipe (310) and the fourth pipe (320) passes through the kettle body (110) and is placed in the confining pressure chamber (730); the other end of the third pipe (310) is connected to the liquid injection tank (820); and the other end of the fourth pipe (320) is connected to the waste liquid tank (830); One end of each of the fifth pipeline (410) and the sixth pipeline (420) passes through the kettle body (110) and is placed in the annular structure, the other end of the fifth pipeline (410) is connected to the first gas injection tank (840), and the other end of the sixth pipeline (420) is connected to the first waste gas tank (850); One end of each of the seventh pipeline (430) and the eighth pipeline (440) passes through the kettle body (110) and is placed in the annular structure; the other end of the seventh pipeline (430) is connected to the second gas injection tank (860); and the other end of the eighth pipeline (440) is connected to the second waste gas tank (870).

7. The device for measuring the interface bonding strength of cement sheath of high temperature and high pressure wells and thermal recovery wells according to claim 1 is characterized in that: The formation model (710) is cylindrical in shape; a wellbore is arranged at the center of the formation model (710), and the casing (720) is arranged in the wellbore; An ultrasonic component (610) is arranged at the center of the casing (720), and the ultrasonic component (610) is connected to an acoustic variable density logging instrument (620); wherein the ultrasonic component (610) and the acoustic variable density logging instrument (620) are used together to measure the attenuation value and amplitude of the casing wave in the circumferential azimuth of the wellbore.

8. A method for measuring the bonding strength of cement sheath interface in high temperature and high pressure wells and thermal recovery wells, characterized in that: The method is used for a device for measuring the bonding strength of cement sheath interface of a high-temperature and high-pressure well and a thermal recovery well as described in any one of claims 1 to 7, wherein the device comprises: a hydrothermal kettle and a casing pressure control system; wherein the hydrothermal kettle comprises a kettle body, a formation model is arranged in the kettle body, and a casing is arranged in the formation model; the casing pressure control system comprises a first pipeline, the first pipeline is connected to a heater, an annulus structure is formed between the casing and the formation model, and the annulus structure is used to form a cement ring; the first interface of the cementing surface is the interface between the cement ring and the casing, and the second interface of the cementing surface is the interface between the cement ring and the formation model, and the method comprises: The temperature condition of the first pipeline is adjusted by the heater, and the hydraulic bonding strength of the first interface of the cementing surface, the hydraulic bonding strength of the second interface of the cementing surface, the mechanical bonding strength of the first interface of the cementing surface, and the mechanical bonding strength of the second interface of the cementing surface are tested under different temperature conditions; wherein the temperature condition includes a high temperature condition and a circulating temperature condition, and the high temperature condition is a condition higher than a preset temperature.

9. The method for measuring the bonding strength of cement sheath interface of high temperature and high pressure wells and thermal recovery wells according to claim 8, characterized in that: The device further comprises a second test system, wherein the first test system in the device further comprises a fifth pipeline, a sixth pipeline, a seventh pipeline, an eighth pipeline, and a pressure gauge arranged on each of the pipelines; wherein the second test system comprises a first pressure sensor and a second pressure sensor; The step of adjusting the temperature of the first pipe by the heater and testing the hydraulic bonding strength of the first interface of the cementing surface, the hydraulic bonding strength of the second interface of the cementing surface, the mechanical bonding strength of the first interface of the cementing surface, and the mechanical bonding strength of the second interface of the cementing surface under different temperature conditions includes: Record the initial reading of the pressure gauge on the fifth pipeline, apply pressure to the fifth pipeline, and when the reading of the pressure gauge on the sixth pipeline begins to increase, stop applying pressure to the fifth pipeline, and when the reading of the pressure gauge on the sixth pipeline is equal to the reading of the pressure gauge on the fifth pipeline, obtain the hydraulic bonding strength of the first interface of the cementing surface under the preset temperature value according to the difference between the reading of the pressure gauge on the sixth pipeline and the reading of the pressure gauge on the fifth pipeline when the last pressure increase value changes; Record the initial reading of the pressure gauge on the seventh pipeline, apply pressure to the seventh pipeline, and when the reading of the pressure gauge on the eighth pipeline begins to increase, stop applying pressure to the seventh pipeline, and when the reading of the pressure gauge on the eighth pipeline is equal to the reading of the pressure gauge on the seventh pipeline, obtain the hydraulic bonding strength of the second interface of the cementing surface under the preset temperature value according to the difference between the reading of the pressure gauge on the eighth pipeline and the reading of the pressure gauge on the seventh pipeline when the last pressure increase value changes; Applying pressure to the casing, observing the value of the first pressure sensor in real time, and when the cement ring is separated from the casing, obtaining the mechanical bonding strength of the first interface of the cementing surface under a preset temperature value according to the value of the first pressure sensor when the last pressurization value changes; Applying pressure to the cement sheath, observing the value of the second pressure sensor in real time, and when the cement sheath is separated from the formation model, obtaining the mechanical bonding strength of the second interface of the cementing surface under a preset temperature value according to the value of the second pressure sensor when the last pressurization value changes; Among them, cement slurry is injected into the annulus structure to obtain the cement ring; when the temperature preset value is determined according to the high temperature condition, the curing temperature of the cement ring is set to the temperature preset value; when the temperature preset value is determined according to the circulation temperature condition, the gas temperature in the first pipeline is adjusted to the temperature preset value by the heater.

10. The method for measuring the bonding strength of cement sheath interface of high temperature and high pressure wells and thermal recovery wells according to claim 9, characterized in that: The device further comprises a first upper kettle cover and a second upper kettle cover, wherein the second upper kettle cover comprises a concave structure, the first upper kettle cover is provided with a first injection port, a second injection port, a third injection port and a fourth injection port, and the second upper kettle cover is provided with a fifth injection port and a sixth injection port; Before obtaining the hydraulic bonding strength of the first interface of the cementing surface at the preset temperature value, the method further includes: Install the first upper kettle cover, and connect the first pipeline, the third pipeline, the fifth pipeline and the seventh pipeline to the first upper kettle cover through the first injection port, the second injection port, the third injection port and the fourth injection port respectively; Before obtaining the mechanical bonding strength of the first interface of the cementing surface at the preset temperature value, the method further includes: The first upper kettle cover is replaced with the second upper kettle cover, and the first pipeline and the third pipeline are connected to the second upper kettle cover through the first injection port and the second injection port respectively.

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