Well cementation cement sheath testing device and method

Abstract

The invention relates to a well cementation cement sheath testing device and method, and belongs to the technical field of well cementation, the device comprises a base, an outer sleeve, an inner sleeve, a first acoustic emission probe and a well cementation quality logging instrument; the bottom ends of the outer sleeve and the inner sleeve are connected with the base, a first annular space is formed between the outer sleeve and the inner sleeve, and the first annular space is used for accommodating a cement sheath to be tested; the first acoustic emission probe is connected with the base and located at the bottom of the first annular space; the well cementation quality logging instrument is fixed to the base and located in the inner sleeve. By means of the device, simulation testing can be conducted on the cement sheath to be tested, whether circumferential tensile failure and / or shear strength failure happens to the cement sheath to be tested or not is determined according to the acoustic emission signals detected by the first acoustic emission probe, and the cementing quality between the cement sheath to be tested and the casing pipe is monitored in real time through the well cementation quality logging instrument. The monitoring sensitivity is high, the reliability is high, and long-term on-line monitoring of the cement sheath failure simulation test can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of well cementing, and in particular to a well cementing cement ring testing device and method. Background Art

[0002] With the continuous growth of global energy demand and the increasing depletion of conventional oil and gas resources, the development of unconventional oil and gas resources has become an important development direction in the energy field. Unconventional oil and gas resources, such as shale oil and gas, tight oil and gas, etc., due to their low reservoir permeability and complex pore structure, require the use of horizontal wells and multi-stage fracturing production technology to improve the recovery rate of unconventional oil and gas resources. During the multi-stage fracturing process, the cement ring is an important barrier connecting the casing and the formation, and its integrity is directly related to the long-term stability and safety of the oil and gas well. However, due to the influence of various factors such as high-pressure fluid injection, formation stress changes, and cement ring material properties during the fracturing process, the cement ring or cementing interface is very easy to be damaged, forming micro-annulus or larger-scale cracks, leading to serious problems such as oil and gas crossflow, reduced fracturing effect, and environmental pollution.

[0003] The failure forms of cementing sheath include three categories: detachment of cementing interface caused by plastic deformation of cement sheath, circumferential tensile failure of cement sheath, and shear strength failure caused by excessive radial stress of cement sheath. In the prior art, the failure process of cement sheath is usually simulated by indoor experiments, and the morphology of cement sheath after being destroyed is directly observed to analyze the failure form of cement sheath. For example, if the cementing interface is peeled off, the casing is separated from the cement sheath; if the cement sheath fails in circumferential tensile failure, through cracks will be generated in the radial direction of the cement sheath; if the cement sheath fails in shear, multiple network cracks will be generated in the cement sheath. However, the direct observation method cannot analyze the tiny damage inside the cement sheath, has poor sensitivity, and needs to stop the experiment and take out the cement sheath sample for observation and analysis. The reliability of the results is poor and long-term online monitoring of periodic continuous experiments cannot be performed. Summary of the invention

[0004] In view of this, it is necessary to provide a cement ring testing device and method to solve the problems of poor sensitivity and reliability of the direct observation method in the prior art and inability to perform long-term online monitoring.

[0005] In order to solve the above problems, in a first aspect, the present invention provides a well cement sheath testing device, comprising: a base, an outer casing, an inner casing, a first acoustic emission probe and a cementing quality logging instrument; The bottom ends of the outer sleeve and the inner sleeve are connected to the base, and a first annular space is formed between the outer sleeve and the inner sleeve, and the first annular space is used to accommodate the cement ring to be tested; The first acoustic emission probe is connected to the base and is located at the bottom of the first annular space; The cementing quality logging instrument is fixed on the base and is located in the inner casing.

[0006] Optionally, it further comprises: a top seat and a second acoustic emission probe; the second acoustic emission probe is connected to the top seat; The top seat is used to cover the top ends of the outer sleeve and the inner sleeve; When the top seat is closed, the second acoustic emission probe is located at the top of the first annular space.

[0007] Optionally, the top seat includes a through hole, and the device further includes: a first flow guide pipe; When the top seat is closed, the through hole is located at the top end of the inner sleeve; The first flow guide pipe extends into the inner sleeve through the through hole.

[0008] Optionally, the first flow guide pipe is used to inject water into the inner casing until the pressure in the inner casing is equal to the target pressure when the cement ring to be tested is placed in the first annular space for failure testing; wherein the target pressure is the pressure in the inner casing when the cement ring to be tested is subjected to a target Mises stress, obtained by analyzing according to the first finite element model; the first finite element model is constructed according to the cementing cement ring testing device; the target Mises stress is the maximum Mises stress borne by the cementing cement ring in actual working conditions, obtained by analyzing according to the second finite element model; the second finite element model is constructed according to the cementing cement ring in actual working conditions.

[0009] Optionally, an internal pressure pump and an internal pressure valve are provided on the first flow guide pipe.

[0010] Optionally, it further comprises: a cylinder wall and a second flow guide tube; the inner diameter of the cylinder wall is greater than the inner diameter of the outer sleeve; The bottom end of the cylinder wall is connected to the base; A second annular space is formed between the cylinder wall and the outer sleeve. The cylinder wall includes a through hole, and the second flow guide pipe extends into the second annular space through the through hole.

[0011] Optionally, a confining pressure pump and a confining pressure valve are provided on the second flow guide pipe.

[0012] Optionally, it also includes: a heating module; the heating module is located in the second annular space.

[0013] Optionally, the heating module is used to adjust the temperature in the first annular space according to a preset ambient temperature when the cement slurry to be tested is injected into the first annular space to form the cement ring to be tested; wherein the preset ambient temperature is the ambient temperature of the cement ring in actual working conditions.

[0014] In a second aspect, the present invention further provides a cementing ring testing method, which is applicable to any of the cementing ring testing devices described above; comprising: When the cement ring to be tested is placed in the first annular space for failure testing, the acoustic emission signal during the test is obtained by the first acoustic emission probe, and the logging value during the test is obtained by the cementing quality logging instrument; The test result of the cement sheath to be tested is determined according to the acoustic emission signal and the logging value.

[0015] The beneficial effects of the present invention are: The device of the present invention comprises: a base, an outer casing, an inner casing, a first acoustic emission probe and a cementing quality logging instrument; the bottom ends of the outer casing and the inner casing are connected to the base, a first annular space is formed between the outer casing and the inner casing, and the first annular space is used to accommodate a cement ring to be tested; the first acoustic emission probe is connected to the base and is located at the bottom of the first annular space; the cementing quality logging instrument is fixed on the base and is located in the inner casing.

[0016] Through the device of the present invention, a simulation test can be performed on the cement ring to be tested, and the acoustic emission signal during the test process can be obtained in real time through the first acoustic emission probe, and whether the cement ring to be tested has circumferential tensile failure and / or shear strength failure can be determined based on the acoustic emission signal. The cementing quality between the cement ring to be tested and the casing can be monitored in real time through the cementing quality logging instrument. Through the device of the present invention, the monitoring sensitivity is high, the reliability is high, and long-term online monitoring of the cement ring failure simulation test can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of an embodiment of a cement ring testing device provided by the present invention; Figure 2 A schematic diagram of a flow chart of an embodiment of a cement ring testing method provided by the present invention; 1-base; 2-outer casing; 3-inner casing; 4-first acoustic emission probe; 5-cementing quality logging instrument; 6-cement ring to be tested; 7-top seat; 8-second acoustic emission probe; 9-first flow guide pipe; 10-internal pressure valve; 11-internal pressure pump; 12-barrel wall; 13-second flow guide pipe; 14-confining pressure valve; 15-confining pressure pump; 16-heating module. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0020] The terms "first", "second", etc., involved in the embodiments of the present invention are used to distinguish similar objects, but are not used to describe a specific order or sequence, nor are they used to indicate or imply their relative importance or implicitly indicate the number of technical features indicated. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] Reference Figure 1 , showing a schematic structural diagram of an embodiment of a cementing sheath testing device provided by the present invention, the device comprises: a base 1, an outer casing 2, an inner casing 3, a first acoustic emission probe 4 and a cementing quality logging instrument 5; The bottom ends of the outer sleeve 2 and the inner sleeve 3 are connected to the base 1, and a first annular space is formed between the outer sleeve 2 and the inner sleeve 3, and the first annular space is used to accommodate the cement ring 6 to be tested; The first acoustic emission probe 4 is connected to the base 1 and is located at the bottom of the first annular space; The cementing quality logging instrument 5 is fixed on the base 1 and is located in the inner casing 3 .

[0023] Casing is an important structural component used in oil and gas wells, water wells or other drilling projects to support the well wall, prevent wellbore collapse, isolate formation fluids and protect the integrity of the wellbore. In this device, the bottom ends of the outer casing 2 and the inner casing 3 can be connected to the base 1 of the device, and the connection method can be a fixed connection or a detachable connection. The inner diameter of the outer casing 2 is larger than the inner diameter of the inner casing 3, and the outer casing 2 can be trapped on the outside of the inner casing 3, so that a first annular space is formed between the outer casing 2 and the inner casing 3, and the first annular space is used to accommodate the cement ring 6 to be tested.

[0024] The cement sheath 6 to be tested can be made according to the material and preparation process of the cement sheath in actual working conditions.

[0025] An acoustic emission probe (AE probe) is a sensor used to detect acoustic emission signals released by a material or structure during a stress process. The first acoustic emission probe 4 can be an acoustic emission probe installed on the base 1 and located at the bottom of the first annular space. Specifically, the first annular space may include a layer of partitions. The first acoustic emission probe 4 is placed below the partition, and the cement ring 6 to be tested is placed above the partition. The first acoustic emission probe 4 below the partition may include one or more.

[0026] The cementing quality logging instrument 5 is a logging tool for evaluating the cementing quality of oil and gas wells. The cementing quality logging instrument 5 evaluates the bonding quality and distribution between the casing and the cement sheath by measuring the physical properties such as acoustic, electromagnetic or radioactive between the casing and the cement sheath. For example, the cementing quality logging instrument 5 can be a sonic logging instrument (CBL / VDL), an ultrasonic imaging logging instrument (USIT), a radioactive logging instrument (RBT), an electromagnetic logging instrument (EMAT), etc. The cementing quality logging instrument 5 can be fixed on the base 1 by a bracket.

[0027] When a failure test of the cement sheath is required, the cement sheath 6 to be tested can be placed in the first annular space. By applying pressure to the inner casing 3, an internal load is provided to the cement sheath 6 to be tested; by applying pressure to the outer casing 2, an external load is provided to the cement sheath 6 to be tested; and the ambient temperature of the device can also be controlled. The three are combined to perform a failure test on the cement sheath 6 to be tested. Failure testing refers to testing the failure condition, or the damage condition, of the cement sheath 6 to be tested under certain pressure and temperature conditions.

[0028] When the cement ring is tested for failure, the first acoustic emission probe 4 can be used to collect the acoustic emission signal of the cement ring 6 to be tested in the stress process in real time, and the average frequency value (AF value) and the ratio of the rise time to the amplitude voltage (RA value) of each acoustic emission signal are calculated. The calculated AF value and RA value are plotted in a two-dimensional coordinate system to form an AF-RA diagram. By observing the distribution characteristics of the data points in the AF-RA diagram, the circumferential tensile failure and shear strength failure of the cement ring 6 to be tested can be judged. At the same time, the bonding quality between the casing and the cement ring 6 to be tested can be judged by the detection value of the cementing quality logging instrument 5. For example, when the cementing quality logging instrument 5 is an acoustic wave logging instrument, if the bonding between the cement ring 6 to be tested and the casing is poor, the measured acoustic wave amplitude signal will be very strong, otherwise the acoustic wave amplitude signal will be weak, so that the cementing interface failure of the cement ring 6 to be tested can be analyzed.

[0029] Through the device of the present invention, the cement ring 6 to be tested can be simulated and tested, and the acoustic emission signal in the test process can be obtained in real time through the first acoustic emission probe 4, and whether the circumferential tensile failure and / or shear strength failure of the cement ring 6 to be tested occurs can be determined based on the acoustic emission signal. The cementing quality between the cement ring 6 to be tested and the casing can be monitored in real time through the cementing quality logging instrument 5. Through the device of the present invention, the monitoring sensitivity is high, the reliability is high, and long-term online monitoring of the cement ring failure simulation test can be realized.

[0030] In one embodiment, the device also includes: a top seat 7 and a second acoustic emission probe 8; the second acoustic emission probe 8 is connected to the top seat 7; the top seat 7 is used to cover the top ends of the outer sleeve 2 and the inner sleeve 3; when the top seat 7 is covered, the second acoustic emission probe 8 is located at the top of the first annular space.

[0031] The top seat 7 may be a flange. When the top seat 7 is closed, a sealed space may be formed between the base 1 - the inner casing 3 - the top seat 7, thereby facilitating pressurization in the sealed space to provide an internal load to the cement ring 6 to be tested.

[0032] The top seat 7 may also be connected to a second acoustic emission probe 8, so as to comprehensively detect the failure condition of the cement sheath 6 to be tested during the failure test process together with the first acoustic emission probe 4 on the base 1.

[0033] In one embodiment, the top seat 7 includes a through hole, and the device further includes: a first flow guide tube 9; when the top seat 7 is covered, the through hole is located at the top end of the inner sleeve 3; the first flow guide tube 9 extends into the inner sleeve 3 through the through hole.

[0034] Fluid is injected into the inner casing through the first flow guide pipe 9, so that the pressure in the inner casing 3 can be increased to simulate the failure test environment of hydraulic fracturing.

[0035] In one embodiment, the first flow guide tube is used to inject fluid into the inner casing until the pressure in the inner casing is equal to the target pressure when the cement ring to be tested is placed in the first annular space for failure testing; wherein the target pressure is the pressure in the inner casing when the cement ring to be tested is subjected to the target Mises stress, obtained by analyzing according to the first finite element model; the first finite element model is constructed according to the cementing cement ring testing device; the target Mises stress is the maximum Mises stress borne by the cementing cement ring in actual working conditions, obtained by analyzing according to the second finite element model; the second finite element model is constructed according to the cementing cement ring in actual working conditions.

[0036] In one embodiment, the first flow guide tube 9 may include an internal pressure pump 11 and an internal pressure valve 10 , and the speed of fluid injection into the inner casing 3 may be controlled by controlling the internal pressure pump 11 and the internal pressure valve 10 .

[0037] In one embodiment, the device also includes: a cylinder wall 12 and a second flow guide tube 13; the inner diameter of the cylinder wall 12 is larger than the inner diameter of the outer sleeve 2; the bottom end of the cylinder wall 12 is connected to the base 1; a second annular space is formed between the cylinder wall 12 and the outer sleeve 2, and the cylinder wall 12 includes a through hole, and the second flow guide tube 13 extends into the second annular space through the through hole.

[0038] The cylinder wall 12 can be trapped on the outer side of the outer casing 2 to form a second annular space between the outer casing 2. When performing a failure test, fluid can be injected into the second annular space through the second flow guide pipe 13 to apply pressure to the outer casing 2, thereby applying an external load to the cement sheath 6 to be tested.

[0039] In one embodiment, the second flow guide pipe 13 may include a confining pressure pump 15 and a confining pressure valve 14 to control the speed at which the fluid is injected into the second annular space.

[0040] In one embodiment, the device further comprises: a heating module 16; the heating module 16 is located in the second annular space. The heating modules 16 can be evenly distributed in the second annular space to provide a certain temperature environment for the cement sheath 6 to be tested.

[0041] In one embodiment, the heating module is used to adjust the temperature in the first annular space according to a preset ambient temperature when the cement slurry to be tested is injected into the first annular space to form the cement ring to be tested; wherein the preset ambient temperature is the ambient temperature of the cement ring in the actual working condition.

[0042] Reference Figure 2 , shows a flow chart of an embodiment of a cementing ring testing method provided by the present invention, the method is applicable to any of the cementing ring testing devices mentioned above, and the method comprises: S201, when the cement ring 6 to be tested is placed in the first annular space for failure testing, an acoustic emission signal during the test is obtained by a first acoustic emission probe, and a logging value during the test is obtained by a cementing quality logging instrument 5; S202, determining the test result of the cement sheath 6 to be tested according to the acoustic emission signal and the logging value.

[0043] The execution subject of this embodiment may be a control device, which may be a computer, etc. The control device may be connected to the first acoustic emission probe 4, the second acoustic emission probe 8 and the cementing quality logging instrument 5 on the device, so as to control the opening and closing of the first acoustic emission probe 4, the second acoustic emission probe 8 and the cementing quality logging instrument 5, and obtain the acoustic emission signal and the logging value in the test process in real time, and determine the test result of the cement sheath 6 to be tested according to the acoustic emission signal and the logging value.

[0044] Through this embodiment, the cement ring 6 to be tested can be simulated and tested, and the acoustic emission signal in the test process can be obtained in real time through the first acoustic emission probe 4 and / or the second acoustic emission probe 8, and whether the circumferential tensile failure and / or shear strength failure of the cement ring 6 to be tested occurs can be determined based on the acoustic emission signal. The cementing quality between the cement ring 6 to be tested and the casing can be monitored in real time through the cementing quality logging instrument 5. The monitoring sensitivity and reliability are high, and long-term online monitoring of the cement ring failure simulation test can be realized.

[0045] In one embodiment, when the cementing cement ring testing device includes a top seat and a second acoustic emission probe, when the cement ring 6 to be tested is placed in the first annular space for failure testing, the acoustic emission signal during the test can be obtained by the first acoustic emission probe 4 and / or the second acoustic emission probe 8, and the logging value during the test can be obtained by the cementing quality logging instrument 5; then the test result of the cement ring 6 to be tested is determined based on the acoustic emission signal and the logging value.

[0046] In one embodiment, the method further includes: obtaining the ambient temperature of the cement ring in the actual working condition; when the cement slurry to be tested is injected into the first annular space to form the cement ring 6 to be tested, adjusting the temperature in the first annular space according to the above ambient temperature by the heating module 16.

[0047] Before the failure test is performed, the top seat 7 can be opened, and the configured cement slurry to be tested can be injected into the first annular space to a certain height. Then the top seat 7 is closed, and the heating module 16 is controlled to be turned on by the control device to simulate the formation temperature (the heating module 16 can be connected to the control device) until the cement slurry to be tested solidifies into the cement ring 6 to be tested.

[0048] In this embodiment, the formation process of cement sheath in actual working conditions can be simulated, so that the influence of cement sheath construction parameters on cement sheath failure can be studied.

[0049] In one embodiment, the method further includes: when performing a failure test on the cement ring 6 to be tested, injecting water into the inner casing 3 through the first flow guide pipe 9 to apply an internal load to the cement ring 6 to be tested, and / or, injecting water into the second annular space through the second flow guide pipe 13 to apply an external load to the cement ring 6 to be tested.

[0050] The control device can control the water injection condition in the inner casing 3 by controlling the internal pressure pump 11 and the internal pressure valve 10 , and can control the water injection condition in the second annular space by controlling the confining pressure pump 15 and the confining pressure valve 14 .

[0051] In one embodiment, the step of injecting water into the inner casing 3 through the first flow guide tube 9 may include: constructing a second finite element model based on the cementing cement ring in actual working conditions; analyzing and obtaining the maximum Mises stress (Mises stress) borne by the cementing cement ring in actual working conditions based on the second finite element model; constructing a first finite element model based on the cementing cement ring testing device; analyzing and obtaining the target pressure in the inner casing 3 when the cement ring 6 to be tested is subjected to the maximum Mises stress based on the first finite element model; and injecting water into the inner casing 3 through the first flow guide tube 9 until the pressure in the inner casing 3 is equal to the target pressure.

[0052] The control device can first obtain the wellbore structural parameters in the actual working conditions, and use the finite element software ABAQUS to build a two-dimensional finite element model (second finite element model) of the casing-cement ring-formation combination to calculate the maximum Mises stress S1 of the cement ring in the actual working conditions. When constructing the second finite element model, the formation boundary size must be greater than 5-6 times the wellbore radius. Therefore, the model size is taken as 3 m×3 m, and friction contact is set between the casing and the cement ring. The corresponding temperature and pressure loads are applied to the inner wall of the casing according to different working conditions. The normal displacement constraint is set on the outer boundary of the formation, and the ground stress load is applied using the predefined field method. Similarly, according to the structure and size of the cement ring test device, the first finite element model is established using the finite element software ABAQUS to calculate the maximum Mises stress S2 of the cement ring under different casing internal pressure conditions, and the casing internal pressure when S2 is equal to S1 is recorded as the target pressure P1.

[0053] During the test, the control device controls the water injection in the inner casing 3 by controlling the inner pressure pump and the inner pressure valve, and stops the water injection when the pressure in the inner casing 3 is equal to the target pressure P1.

[0054] In summary, the beneficial effects of the present invention include the following: (1) By combining acoustic emission technology and cementing quality acoustic amplitude logging, the failure mode of the cement sheath to be tested under different working conditions can be accurately monitored. By analyzing the acoustic emission signal (such as frequency and amplitude) and collecting cementing quality logging data in real time, the damage of the cement sheath body and cementing interface to be tested can be fully understood. This is more accurate than the traditional laboratory direct observation method and can provide richer failure information. Compared with the low sensitivity and poor reliability of traditional methods, the invention scheme can monitor the damage process of the cement sheath in real time and online, improving the precision and accuracy of the analysis.

[0055] (2) The traditional experimental method requires stopping the experiment and taking out cement samples for analysis, which cannot achieve continuous online monitoring. In contrast, the solution of the present invention realizes real-time online monitoring during the experiment by integrating the acoustic emission probe and the cementing quality logging instrument. This not only avoids experimental interruptions, but also enables periodic and continuous experimental analysis to ensure data continuity and non-destructiveness of the experiment. The real-time monitoring function enables the damage form of the cement sheath to be captured and analyzed in time during the experiment, greatly improving the experimental efficiency.

[0056] (3) It can comprehensively consider the influence of multiple factors on cement sheath failure, such as wellbore temperature, construction parameters, and mechanical properties of cement sheath, thereby providing a comprehensive failure analysis model. Under complex working conditions such as fracturing operations and carbon dioxide storage, the failure mechanism of cement sheath may change due to different factors, and traditional analysis methods are often difficult to cover all complex situations. The present invention, by combining experimental simulation and numerical analysis, can provide accurate failure form analysis for different working conditions, providing more targeted guidance for on-site design and construction.

[0057] (4) By accurately analyzing the failure mode of cement sheath, the present invention can help engineers better understand the behavior of cement sheath under different operating conditions. According to the type and degree of damage to the cement sheath, engineers can adjust the construction parameters, optimize the cementing design, and improve the strength and sealing of the cement sheath. This can not only improve the cementing quality and fracturing effect, but also reduce environmental pollution and wellbore safety risks, thereby improving the success rate of operations such as unconventional oil and gas production and carbon dioxide storage.

[0058] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A cement ring testing device, characterized in that: include: Base, outer casing, inner casing, first acoustic emission probe and cementing quality logging tool; The bottom ends of the outer sleeve and the inner sleeve are connected to the base, and a first annular space is formed between the outer sleeve and the inner sleeve, and the first annular space is used to accommodate the cement ring to be tested; The first acoustic emission probe is connected to the base and is located at the bottom of the first annular space; The cementing quality logging instrument is fixed on the base and is located in the inner casing.

2. The cement ring testing device according to claim 1, characterized in that: Also includes: A top seat and a second acoustic emission probe; The second acoustic emission probe is connected to the top seat; The top seat is used to cover the top ends of the outer sleeve and the inner sleeve; When the top seat is closed, the second acoustic emission probe is located at the top of the first annular space.

3. The cement ring testing device according to claim 2, characterized in that: The top seat includes a through hole, and the device further includes: a first flow guide pipe; When the top seat is closed, the through hole is located at the top end of the inner sleeve; The first flow guide pipe extends into the inner sleeve through the through hole.

4. The cement ring testing device according to claim 3, characterized in that: The first flow guide tube is used to inject fluid into the inner casing until the pressure in the inner casing is equal to the target pressure when the cement ring to be tested is placed in the first annular space for failure testing; wherein the target pressure is the pressure in the inner casing when the cement ring to be tested is subjected to the target Mises stress, obtained by analyzing according to the first finite element model; the first finite element model is constructed according to the cementing cement ring testing device; the target Mises stress is the maximum Mises stress borne by the cementing cement ring in actual working conditions, obtained by analyzing according to the second finite element model; the second finite element model is constructed according to the cementing cement ring in actual working conditions.

5. The cement ring testing device according to claim 3, characterized in that: The first flow guiding pipe is provided with an internal pressure pump and an internal pressure valve.

6. The cement ring testing device according to claim 1, characterized in that: Also includes: A cylinder wall and a second flow guide tube; the inner diameter of the cylinder wall is greater than the inner diameter of the outer sleeve; The bottom end of the cylinder wall is connected to the base; A second annular space is formed between the cylinder wall and the outer sleeve. The cylinder wall includes a through hole, and the second flow guide pipe extends into the second annular space through the through hole.

7. The cement ring testing device according to claim 6, characterized in that: The second flow guide pipe is provided with a confining pressure pump and a confining pressure valve.

8. The cement ring testing device according to claim 6, characterized in that: Also includes: Heating module; the heating module is located in the second annular space.

9. The cement ring testing device according to claim 8, characterized in that: The heating module is used to adjust the temperature in the first annular space according to a preset ambient temperature when the cement slurry to be tested is injected into the first annular space to form the cement ring to be tested; wherein the preset ambient temperature is the ambient temperature of the cement ring in actual working conditions.

10. A cement ring testing method, characterized in that: A cement ring testing device suitable for use in any one of claims 1 to 9; comprising: When the cement ring to be tested is placed in the first annular space for failure testing, the acoustic emission signal during the test is obtained by the first acoustic emission probe, and the logging value during the test is obtained by the cementing quality logging instrument; The test result of the cement sheath to be tested is determined according to the acoustic emission signal and the logging value.

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