An ultra-low density cementing quality evaluation method and related equipment

Abstract

The application relates to the technical field of cementing quality evaluation, and discloses an ultra-low-density cementing quality evaluation method and related equipment, which comprises the following steps: obtaining solid-liquid-gas properties of ultra-low-density cement; performing primary determination on the obtained solid-liquid-gas properties of the ultra-low-density cement to obtain a preliminary determination result; performing secondary determination on the preliminary determination result to obtain a final determination result; and performing ultra-low-density cementing quality evaluation according to the final determination result. The combination of the primary determination and the secondary determination forms a multi-level and multi-dimensional evaluation system, which can more comprehensively reflect the actual situation of the ultra-low-density cementing, so that the accuracy of the evaluation is improved.

Description

Technical Field

[0001] This invention relates to the field of cement cementing quality evaluation technology, specifically to a method and related equipment for evaluating the quality of ultra-low density cement cementing. Background Technology

[0002] During the tapping of potential in old oilfields, as development deepens, formation pressure gradients continuously decrease, leading to an increasing number of low-pressure, easily leaking areas. High-density conventional cement can cause formation fracturing and mud circulation loss, resulting in well control issues during drilling and cementing. Mud backflow can also contaminate or even block the formation. Furthermore, shallow oil reservoirs are mostly low-pressure, easily leaking areas, facing the same problems when using high-density conventional cement. These realities have spurred the development of low-density cement. This type of cement has a very low density, mostly between 1.0 and 1.5 g / cm³, and some even below 0.5 g / cm³, but high strength. Low-density cement cementing technology improves interlayer sealing. It not only protects freshwater layers but also prevents casing corrosion, and allows for complete consolidation of low-pressure, easily leaking formations. Low-density cement, with its excellent comprehensive cement slurry performance, has become an ideal material for weak formations, long cementing sections, and underbalanced cementing. It can replace conventional cement slurry and ordinary low-density cement slurry, making it an ideal cementing technology for low-pressure, easily leaking, low-permeability, and shallow gas and oil reservoirs. It can be applied to cementing shallow gas, low-pressure easily leaking, underbalanced drilling, deep well cementing, gas channeling prevention, horizontal wells, and directional wells.

[0003] Due to these advantages, low-density, high-strength cement is being used more and more widely, and major oil service companies are investing considerable financial and material resources in the development and promotion of new low-density cement. The application of low-density cement in overseas oilfields has been reported, and the ability to perform well logging operations with low-density cement is gradually becoming a technical threshold and is being widely included in oilfield service tenders. As the advantages of low-density cement are increasingly recognized by the market, its technological development and market expansion capabilities will be stronger, and oilfields will inevitably raise their technical requirements for cementing quality evaluation instruments.

[0004] Traditional acoustic cementing quality assessment instruments, such as variable amplitude density logging (CBL-VDL), sector acoustic amplitude logging (SBT, RBT), and ultrasonic pulse echo imaging logging, either have low frequencies and long source distances, resulting in low measurement accuracy, or high frequencies that provide sufficient measurement accuracy but are insufficient for shallow depths. Furthermore, the acoustic impedance of low-density cement (density below 1.8 g / cm³) is similar to that of downhole fluid media, making it difficult for conventional CBL-VDL, sector acoustic amplitude logging, and ultrasonic pulse echo imaging logging techniques to effectively assess the quality of low-density cement cement and distinguish it from the fluid media. Logging technology, exemplified by Schlumberger's IBC instrument, combines pulse echo and leakage Lamb wave measurement methods. It uses cross-plots of cement acoustic impedance and Lamb wave attenuation rate for joint evaluation. Ultrasonic pulse echo detection ensures high accuracy in circumferential measurement, casing radius measurement, and wall thickness measurement. Simultaneously, the instrument excites leakage Lamb waves, whose particle vibrations exhibit an elliptical trajectory along the wave propagation direction. The vibrations include both longitudinal vibrations parallel to the wave propagation direction and shear vibrations, demonstrating high sensitivity to low-density cement and facilitating the differentiation between low-density cement and liquid media. Furthermore, the instrument employs a rotating scanning method during operation, enabling 360-degree scanning imaging and evaluation of cementing quality around the well, meeting the requirements for high-precision quantitative cementing quality assessment.

[0005] While logging technologies such as IBC have alleviated the challenges of evaluating low-density cement cement to some extent, they still have limitations in evaluating ultra-low-density cement (density below 1.5 g / cm³) cement, failing to accurately and reliably distinguish between solid and liquid media. These technologies utilize solid-liquid-gas (SLG) cross-plots, using cement acoustic impedance and Lamb wave attenuation rates to delineate different regions and differentiate the solid-liquid-gas properties of the post-casing medium, thus determining the quality of the post-casing cementing. For instruments from different manufacturers and with different casing sizes, the cross-plot boundaries may differ, but the basic principles and methods remain the same, and a solid-liquid-gas media distinction boundary exists on the cross-plot. However, the acoustic impedance of ultra-low-density cement is very close to or even equal to that of liquid media, resulting in overlapping areas on the cross-plot. In this case, the measured cement acoustic impedance and Lamb wave attenuation rate values ​​conform to both liquid and ultra-low-density cement (solid) characteristics, leading to unreliable solid-liquid-gas segmentation results and making it impossible to accurately evaluate the quality of ultra-low-density cement cement using existing technologies or methods.

[0006] Existing technologies have developed cementation quality evaluation methods for low-density and ultra-low-density cement by improving the cementation index evaluation standards and methods of conventional acoustic amplitude variable density (CBL-VDL) instruments and combining laboratory calibration results. However, no research has been conducted on methods for evaluating ultra-low-density cement using Lamb waves. Patent application CN110397434A discloses a cementation evaluation logging tool and method combining pulsed ultrasonic echo and leakage Lamb waves, but it lacks description of methods for evaluating ultra-low-density cement. Meanwhile, existing technologies have conducted research on the propagation response mechanism of ultrasonic pulse echo and Lamb waves for IBC-type instruments, established a relationship model between ultrasonic Lamb wave attenuation rate, vertical echo resonance efficiency, and acoustic impedance of the casing medium, constructed a solid-liquid-gas three-phase medium evaluation chart, developed IBC-type instruments, and conducted field applications. However, no corresponding research has been conducted on accurately distinguishing the solid-liquid medium properties in ultra-low-density cement cases. Summary of the Invention

[0007] The purpose of this invention is to provide a method and related equipment for evaluating the quality of ultra-low density cement cementing, so as to solve the technical problem of how to improve the accuracy of ultra-low density cement cementing quality evaluation in the prior art.

[0008] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a method for evaluating the quality of ultra-low density cement cementing, comprising: Obtain the solid-liquid-gas properties of ultra-low density cement; The solid, liquid and gas properties of the obtained ultra-low density cement were determined by a first-level assessment to obtain preliminary results. The preliminary judgment results are then subjected to a secondary judgment to obtain the final judgment result. The quality evaluation of ultra-low density cement cementing will be conducted based on the final judgment results.

[0009] Preferably, in the step of performing a first-level determination on the solid-liquid-gas properties of the obtained ultra-low density cement to obtain a preliminary determination result, the first-level determination process is as follows: The acoustic impedance value of cement measured using pulse echo; Set the cement acoustic impedance threshold; The measured cement acoustic impedance value is compared with the set cement acoustic impedance threshold to obtain the comparison result, and a preliminary judgment result is obtained based on the comparison result.

[0010] Furthermore, the comparison results include: when the measured cement acoustic impedance value is greater than the set cement acoustic impedance threshold, the judgment result is obtained by the intersection plot of the cement acoustic impedance measured by the pulse echo and the attenuation rate measured by the leakage Lamb wave; otherwise, a secondary judgment is performed.

[0011] Furthermore, in the step of obtaining the determination result by cross-plotting the cement acoustic impedance measured by pulse echo and the attenuation rate measured by leakage Lamb wave, the regions divided by the acoustic impedance and attenuation rate in the cross-plot can correspond to the solid-liquid-gas properties of ultra-low density cement, and the cementing quality of ultra-low density cement can be obtained based on the solid-liquid-gas properties of ultra-low density cement.

[0012] Preferably, in the step of performing a secondary judgment on the preliminary judgment result to obtain the final judgment result, the specific process of the secondary judgment is as follows: A simulation model of ultrasonic wave propagation in the leakage Lamb wave mode was constructed, which includes three sets of oblique emission transducers, a sleeve, a cement ring, and a formation. The interface between the outer wall of the casing and the inner wall of the cement sheath is defined as the first interface, and the interface between the outer wall of the cement sheath and the formation is defined as the second interface. The preliminary judgment results are input into the ultrasonic propagation simulation model of the leakage Lamb wave mode, and the final result is determined based on the number of echo packets obtained from the second interface.

[0013] Furthermore, in the step of inputting the preliminary judgment result data into the ultrasonic propagation simulation model of the leakage Lamb wave mode and determining the final result based on the number of echo packets obtained from the second interface, the final result is that when the number of echo packets obtained from the preliminary judgment result data input into the ultrasonic propagation simulation model of the leakage Lamb wave mode is greater than 1, the ultra-low density cement is a solid medium; otherwise, the ultra-low density cement is a liquid medium.

[0014] Furthermore, the quality of ultra-low density cement cementing is evaluated based on the final judgment results. When ultra-low density cement is a solid medium, the quality of ultra-low density cement cementing is qualified; when ultra-low density cement is a liquid medium, the quality of ultra-low density cement cementing is unqualified.

[0015] Secondly, the present invention also provides an ultra-low density cement cementing quality evaluation system, comprising: Solid-liquid-gas property acquisition module, used to acquire the solid-liquid-gas properties of ultra-low density cement; The first judgment module is used to perform a first-level judgment on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain a preliminary judgment result. The second judgment module is used to perform secondary judgment on the preliminary judgment results to obtain the final judgment result; The evaluation module is used to evaluate the quality of ultra-low density cement cementing based on the final judgment results.

[0016] Thirdly, the present invention also provides a mobile terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the ultra-low density cement cementing quality evaluation method described above.

[0017] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the ultra-low density cement cementing quality evaluation method described above.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a method for evaluating the quality of ultra-low density cement cementing. First, the solid-liquid-gas properties of the ultra-low density cement are obtained. By combining primary and secondary judgments, a multi-level, multi-dimensional evaluation system is formed, which can more comprehensively reflect the actual situation of ultra-low density cement cementing, thereby improving the accuracy of the evaluation. The cement acoustic impedance value measured using pulse-echo technology directly reflects the physical parameters of cement cementing quality. Data can be acquired quickly and accurately, avoiding data delays or errors that may exist in traditional methods. The leakage Lamb wave mode ultrasonic propagation simulation model can simulate the propagation process of ultrasonic waves in casing, cement sheath, and formation, especially the reflection and transmission behavior at different interfaces, which can more accurately reflect the propagation characteristics of ultrasonic waves in complex media, thereby improving the accuracy of the judgment. By observing the number of echo packets obtained at the second interface, the quality of cement cementing is judged, improving the accuracy of the judgment results.

[0019] Specifically, this invention utilizes the number of Lamb wave echoes at two interfaces to accurately distinguish the solid-liquid medium properties in the case of ultra-low density cement. It can also assist in judging the solid-liquid medium conditions after the casing of conventional low-density cement, fundamentally solving the problem of distinguishing the solid-liquid medium after the casing of low-density cement. Attached Figure Description

[0020] Figure 1 This is a flowchart of the ultra-low density cement cementing quality evaluation method in an embodiment of the present invention; Figure 2 This is a flowchart of the first-level determination in an embodiment of the present invention; Figure 3 This is a flowchart of the secondary determination in an embodiment of the present invention; Figure 4 This is a diagram illustrating the solid-liquid-gas interaction in an embodiment of the present invention; Figure 5 This is a simulation model diagram of the leakage Lamb wave mode ultrasonic wave propagation in an embodiment of the present invention; Figure 6These are snapshots of the Lamb wave field in the case of free sleeve and ultra-low density cement in the embodiments of the present invention, wherein 6a is a snapshot of the Lamb wave field in the case of free sleeve; and 6b is a snapshot of the Lamb wave field in the case of ultra-low density cement. Figure 7 These are the Lamb wave reception waveforms at the far end in the case of free sleeve and ultra-low density cement in the embodiments of the present invention, where 7a is the Lamb wave reception waveform at the far end of the free sleeve; and 7b is the Lamb wave reception waveform at the far end in the case of ultra-low density cement. Figure 8 This is a schematic diagram of the principle structure of the ultra-low density cement cementing quality evaluation system in an embodiment of the present invention; In the diagram: 1. Solid-liquid-gas property acquisition module; 2. First judgment module; 3. Second judgment module; 4. Evaluation module. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide a method and related equipment for evaluating the quality of ultra-low density cement cementing, so as to solve the technical problem of how to improve the accuracy of ultra-low density cement cementing quality evaluation in the prior art.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: Example 1 See Figure 1 In one embodiment of the present invention, a method for evaluating the quality of ultra-low density cement cementing is provided, comprising the following steps: Step 1: Obtain the solid, liquid, and gas properties of ultra-low density cement; Step 2: Perform a first-level determination on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain preliminary determination results; Specifically, according to Figure 2 As shown, in the steps of obtaining preliminary results by first-level determination of the solid-liquid-gas properties of the obtained ultra-low density cement, the first-level determination process is as follows: S1, the acoustic impedance value of cement measured using pulse echo; S2, set the cement acoustic impedance threshold; S3. Compare the measured cement acoustic impedance value with the set cement acoustic impedance threshold to obtain the comparison result, and obtain the preliminary judgment result based on the comparison result.

[0024] Specifically, the comparison results include: when the measured cement acoustic impedance value is greater than the set cement acoustic impedance threshold, the judgment result is obtained by the intersection plot of the cement acoustic impedance measured by the pulse echo and the attenuation rate measured by the leakage Lamb wave; otherwise, a secondary judgment is performed.

[0025] In the step of obtaining the judgment result by cross-plotting the cement acoustic impedance measured by pulse echo and the attenuation rate measured by leakage Lamb wave, the regions divided by the acoustic impedance and attenuation rate in the cross-plot can correspond to the solid-liquid-gas properties of ultra-low density cement, and the cementing quality of ultra-low density cement can be obtained based on the solid-liquid-gas properties of ultra-low density cement.

[0026] Step 3: Perform a secondary judgment on the preliminary judgment result to obtain the final judgment result; Specifically, according to Figure 3 As shown, in the steps of performing a secondary judgment on the preliminary judgment result to obtain the final judgment result, the specific process of the secondary judgment is as follows: L1, construct a simulation model of ultrasonic wave propagation in the leakage Lamb wave mode, which includes three sets of oblique emission transducers, sleeve, cement ring and formation. L2, the interface between the outer wall of the casing and the inner wall of the cement sheath is defined as the first interface, and the interface between the outer wall of the cement sheath and the formation is defined as the second interface; L3 inputs the preliminary judgment result data into the ultrasonic propagation simulation model of the leakage Lamb wave mode, and determines the final result based on the number of echo packets obtained from the second interface.

[0027] Specifically, in the step of inputting the preliminary judgment result data into the ultrasonic propagation simulation model of the leakage Lamb wave mode, and determining the final result based on the number of echo packets obtained from the second interface, the final result is that when the number of echo packets obtained from the preliminary judgment result data input into the ultrasonic propagation simulation model of the leakage Lamb wave mode is greater than 1, the ultra-low density cement is a solid medium; otherwise, the ultra-low density cement is a liquid medium.

[0028] Step 4: Evaluate the quality of ultra-low density cement cementing based on the final judgment results.

[0029] Specifically, the quality of ultra-low density cement cementing is evaluated based on the final judgment results. When ultra-low density cement is a solid medium, the quality of ultra-low density cement cementing is qualified; when ultra-low density cement is a liquid medium, the quality of ultra-low density cement cementing is unqualified.

[0030] according to Figure 4As shown, a cross-plot of two parameters—cement acoustic impedance measured using pulse echo and attenuation rate measured using leakage Lamb wave—is presented. Different regions defined by acoustic impedance and attenuation rate on the cross-plot correspond to the properties of the backfill medium, thus indicating the backfill cementing quality. For instruments from different manufacturers and for different casing sizes, the cross-plot may show differences in the solid-liquid-gas demarcation boundaries, but the basic principle remains the same. In the case of ultra-low density cement, there is an overlapping area with the liquid medium, such as... Figure 4 In region 1, the acoustic impedance and Lamb wave attenuation rate of the cement measured by the instrument at this time meet both the characteristics of liquid and ultra-low density cement (solid). Therefore, the final judgment result is obtained according to the secondary judgment.

[0031] In this embodiment Figure 5 This is a simulation model diagram of ultrasonic wave propagation in the leakage Lamb wave mode. Typically, it consists of one oblique transmitting transducer and two oblique receiving transducers with different source distances. The oblique angles are adjusted according to the wellbore environment. The first interface is the junction between the outer wall of the casing and the inner wall of the cement sheath, and the second interface is the junction between the outer wall of the cement sheath and the formation. The Lamb wave attenuation rate is calculated using the amplitude of the near- and far-end echo waveforms at one interface according to the corresponding formula.

[0032] This embodiment Figure 6 This is a snapshot of the Lamb wave field under the conditions of free casing and ultra-low density cement, in which, Figure 6 a is a free sleeve with an acoustic impedance of 1.5M ayl (water is behind the sleeve). Figure 6 b is a snapshot of the Lamb wave field in the case of ultra-low density cement.

[0033] This embodiment Figure 7 The figures show the Lamb wave received at the far end under the conditions of free casing and ultra-low density cement. Figure 7a shows the Lamb wave received at the far end under the free casing condition; Figure 7b shows the Lamb wave received at the far end under the ultra-low density cement condition. The calculation conditions are as follows: Sleeve: Density 7.8 g / cm³ 3 Longitudinal wave speed: 5900 m / s; transverse wave speed: 3200 m / s.

[0034] Water: density 1 g / cm³ 3 Longitudinal wave 1500m / s, sleeve thickness 10mm, cement ring thickness 20mm.

[0035] Ultra-low density cement: density 1g / cm³ 3 Longitudinal wave 1500 m / s, transverse wave 780 m / s, sleeve thickness 10 mm, cement ring thickness 20 mm.

[0036] Formation: Density 2.5 g / cm³ 3 Longitudinal wave speed: 4500 m / s; transverse wave speed: 2300 m / s.

[0037] according to Figure 6 and Figure 7 As shown, when the medium behind the free sleeve is liquid, the interface echo has only one PP mode. When the medium behind the sleeve is ultra-low density cement, the interface echo has four modes: PP, PS, SP and SS. However, in practice, three wave packets can usually be received.

[0038] When the acoustic impedance of the solid-liquid-gas interface is less than the set acoustic impedance threshold, for example, the acoustic impedance threshold is 2.5MRayl, that is, the overlapping area of ​​ultra-low density cement and liquid, the solid and liquid media are distinguished according to the number of echoes at the two interfaces in the Lamb wave waveform (preferably the far-end Lamb wave receiving waveform). If there is only one wave packet in the two interface echo, it is determined that the medium is liquid; if there is more than one wave packet in the two interface echo, it is determined that the medium is solid.

[0039] The quality of ultra-low density cement cementing is evaluated based on the final judgment results. When ultra-low density cement is a solid medium, the quality of ultra-low density cement cementing is qualified; when ultra-low density cement is a liquid medium, the quality of ultra-low density cement cementing is unqualified.

[0040] This embodiment provides a method for evaluating the quality of ultra-low density cement cementing, setting the ultra-low density cement parameters as follows: density 1 g / cm³. 3 The longitudinal wave speed is 1500 m / s, the transverse wave speed is 780 m / s, the casing thickness is 10 mm, and the cement sheath thickness is 20 mm. At this point, the acoustic impedance of the cement is 1.5 MRayl. Setting the cement acoustic impedance threshold to 2.5 MRayl, the preliminary judgment data is input into the leakage Lamb wave mode ultrasonic propagation simulation model. The number of Lamb wave echoes at the second interface is 3, which is greater than 1. Therefore, the ultra-low density cement is determined to be a solid medium, and the ultra-low density cement cementing quality is deemed qualified.

[0041] In summary, this embodiment provides a method for evaluating the quality of ultra-low density cement cementing. First, the solid-liquid-gas properties of the ultra-low density cement are obtained. By combining primary and secondary judgments, a multi-level, multi-dimensional evaluation system is formed, which can more comprehensively reflect the actual situation of ultra-low density cement cementing, thereby improving the accuracy of the evaluation. The cement acoustic impedance value measured using pulse-echo technology directly reflects the physical parameters of cement cementing quality. This allows for rapid and accurate data acquisition, avoiding data delays or errors that may exist in traditional methods. The leakage Lamb wave mode ultrasonic propagation simulation model can simulate the propagation process of ultrasonic waves in the casing, cement sheath, and formation, especially the reflection and transmission behavior at different interfaces, which can more accurately reflect the propagation characteristics of ultrasonic waves in complex media, thereby improving the accuracy of the judgment. By observing the number of echo packets obtained at the second interface, the quality of cement cementing is judged, further improving the accuracy of the judgment results.

[0042] Example 2 according to Figure 8 As shown, the present invention also provides an ultra-low density cement cementing quality evaluation system, comprising: Solid-liquid-gas property acquisition module 1 is used to acquire the solid-liquid-gas properties of ultra-low density cement; The first judgment module 2 is used to perform a first-level judgment on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain a preliminary judgment result. The second judgment module 3 is used to perform secondary judgment on the preliminary judgment result to obtain the final judgment result; Evaluation module 4 is used to evaluate the quality of ultra-low density cement cementing based on the final judgment results.

[0043] Example 3 The present invention also provides a mobile terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, such as an ultra-low density cement cementing quality evaluation program.

[0044] When the processor executes the computer program, it implements the steps of the above-described ultra-low density cement cementing quality evaluation method, for example: Obtain the solid-liquid-gas properties of ultra-low density cement; The solid, liquid and gas properties of the obtained ultra-low density cement were determined by a first-level assessment to obtain preliminary results. The preliminary judgment results are then subjected to a secondary judgment to obtain the final judgment result. The quality evaluation of ultra-low density cement cementing will be conducted based on the final judgment results.

[0045] Alternatively, when the processor executes the computer program, it implements the functions of each module in the above system, for example: Solid-liquid-gas property acquisition module 1 is used to acquire the solid-liquid-gas properties of ultra-low density cement; The first judgment module 2 is used to perform a first-level judgment on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain a preliminary judgment result. The second judgment module 3 is used to perform secondary judgment on the preliminary judgment result to obtain the final judgment result; Evaluation module 4 is used to evaluate the quality of ultra-low density cement cementing based on the final judgment results.

[0046] For example, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the mobile terminal.

[0047] For example, the computer program can be divided into a solid-liquid-gas property acquisition module 1, a first determination module 2, a second determination module 3, and an evaluation module 4; The specific functions of each module are as follows: Solid-liquid-gas property acquisition module 1 is used to acquire the solid-liquid-gas properties of ultra-low density cement; The first judgment module 2 is used to perform a first-level judgment on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain a preliminary judgment result. The second judgment module 3 is used to perform secondary judgment on the preliminary judgment result to obtain the final judgment result; Evaluation module 4 is used to evaluate the quality of ultra-low density cement cementing based on the final judgment results.

[0048] The mobile terminal can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The mobile terminal may include, but is not limited to, a processor and memory.

[0049] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the mobile terminal, connecting various parts of the mobile terminal via various interfaces and lines.

[0050] The memory can be used to store the computer program and / or module. The processor implements various functions of the mobile terminal by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0051] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function (such as sound playback, image playback, etc.); the data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, SmartMediaCards (SMC), Secure Digital (SD) cards, FlashCards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0052] Example 4 The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method for evaluating the quality of ultra-low density cement cementing.

[0053] If the modules / units integrated in the mobile terminal are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0054] Based on this understanding, all or part of the processes in the above method can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-described aggregated reinforcement learning resource scheduling method. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate form.

[0055] The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0056] It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the quality of ultra-low density cement cementing, characterized in that, include: Obtain the solid-liquid-gas properties of ultra-low density cement; The solid, liquid and gas properties of the obtained ultra-low density cement were determined by a first-level assessment to obtain preliminary results. The preliminary judgment results are then subjected to a secondary judgment to obtain the final judgment result. The quality evaluation of ultra-low density cement cementing will be conducted based on the final judgment results.

2. The method for evaluating the quality of ultra-low density cement cementing according to claim 1, characterized in that, In the step of obtaining a preliminary determination result by performing a first-level determination of the solid, liquid, and gas properties of the obtained ultra-low density cement, the first-level determination process is as follows: The acoustic impedance value of cement measured using pulse echo; Set the cement acoustic impedance threshold; The measured cement acoustic impedance value is compared with the set cement acoustic impedance threshold to obtain the comparison result, and a preliminary judgment result is obtained based on the comparison result.

3. The method for evaluating the quality of ultra-low density cement cementing according to claim 2, characterized in that, The comparison results include the following: when the measured cement acoustic impedance value is greater than the set cement acoustic impedance threshold, the judgment result is obtained by the intersection of the cement acoustic impedance measured by the pulse echo and the attenuation rate measured by the leakage Lamb wave; otherwise, a secondary judgment is performed.

4. The method for evaluating the quality of ultra-low density cement cementing according to claim 3, characterized in that, In the step of obtaining the determination result by intersecting the cement acoustic impedance measured by pulse echo and the attenuation rate measured by leakage Lamb wave, the regions divided by the acoustic impedance and attenuation rate in the intersecting chart can correspond to the solid-liquid-gas properties of ultra-low density cement, and the cementing quality of ultra-low density cement can be obtained based on the solid-liquid-gas properties of ultra-low density cement.

5. The method for evaluating the quality of ultra-low density cement cementing according to claim 1, characterized in that, The specific process of the secondary judgment in obtaining the final judgment result from the preliminary judgment result is as follows: A simulation model of ultrasonic wave propagation in the leakage Lamb wave mode was constructed, which includes three sets of oblique emission transducers, a sleeve, a cement ring, and a formation. The interface between the outer wall of the casing and the inner wall of the cement sheath is defined as the first interface, and the interface between the outer wall of the cement sheath and the formation is defined as the second interface. The preliminary judgment results are input into the ultrasonic propagation simulation model of the leakage Lamb wave mode, and the final result is determined based on the number of echo packets obtained from the second interface.

6. The method for evaluating the quality of ultra-low density cement cementing according to claim 5, characterized in that, In the step of inputting the preliminary judgment result data into the leakage Lamb wave mode ultrasonic propagation simulation model and determining the final result based on the number of echo packets obtained from the second interface, the final result is that when the number of echo packets obtained from the preliminary judgment result data input into the leakage Lamb wave mode ultrasonic propagation simulation model is greater than 1, the ultra-low density cement is a solid medium; otherwise, the ultra-low density cement is a liquid medium.

7. The method for evaluating the quality of ultra-low density cement cementing according to claim 6, characterized in that, The quality evaluation of ultra-low density cement cementing is based on the final judgment result. When the ultra-low density cement is a solid medium, the quality of ultra-low density cement cementing is qualified; when the ultra-low density cement is a liquid medium, the quality of ultra-low density cement cementing is unqualified.

8. A quality evaluation system for ultra-low density cement cementing, characterized in that, include: Solid-liquid-gas property acquisition module, used to acquire the solid-liquid-gas properties of ultra-low density cement; The first judgment module is used to perform a first-level judgment on the solid, liquid and gas properties of the obtained ultra-low density cement to obtain a preliminary judgment result. The second judgment module is used to perform secondary judgment on the preliminary judgment results to obtain the final judgment result; The evaluation module is used to evaluate the quality of ultra-low density cement cementing based on the final judgment results.

9. A mobile terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the ultra-low density cement cementing quality evaluation method as described in any one of claims 1-7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the ultra-low density cement cementing quality evaluation method as described in any one of claims 1-7.

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