Ground stress test fracturing section selection method and device, electronic equipment and storage medium

Abstract

The embodiment of the application discloses a method and device for selecting a ground stress test fracturing section, electronic equipment and a storage medium, and belongs to the technical field of engineering investigation and design. The method can solve the problem that the method for determining the ground stress fracturing section according to the integrity of a core is not accurate in the prior art. The method comprises the following steps: obtaining a surrounding rock potential resistivity curve of a borehole by performing a potential resistivity test on the borehole; and obtaining acoustic wave data of the borehole by performing an acoustic wave test on the borehole; and determining the ground stress test fracturing section based on the surrounding rock potential resistivity curve and the acoustic wave data.

Description

Technical Field

[0001] This application relates to the field of engineering survey and design technology, and in particular to a method, apparatus, electronic device and storage medium for selecting fracturing sections for geostress testing. Background Technology

[0002] In-situ stress is the initial stress existing in the Earth's crustal rock mass. All deformations occurring in the Earth's crust (such as folding and fracturing) are the result of in-situ stress. The most commonly used method for testing in-situ stress is hydraulic fracturing. Selecting a suitable fracturing section for in-situ stress testing is the basis for hydraulic fracturing to test in-situ stress.

[0003] Currently, the main method for determining the fracturing section for in-situ stress testing is to examine core samples or borehole logging tables, identifying locations with higher core integrity as the fracturing section for in-situ stress testing. However, this method has limitations. Core samples only provide a glimpse into a single borehole, and their integrity does not represent the integrity of the rock within a certain range along the borehole axis. Therefore, determining the fracturing section solely based on core integrity is not accurate enough. Summary of the Invention

[0004] This application provides a method, apparatus, electronic device, and storage medium for selecting fracturing sections in geostress testing, in order to solve the problem that the existing method for determining geostress fracturing sections based on the integrity of rock cores is not accurate enough.

[0005] A first aspect of this application provides a method for selecting a fracturing section for in-situ stress testing. The method includes: performing a potential resistivity test on a borehole to obtain a potential resistivity curve of the surrounding rock; performing an acoustic test on the borehole to obtain acoustic data of the borehole; and determining a fracturing section for in-situ stress testing based on the potential resistivity curve of the surrounding rock and the acoustic data.

[0006] Optionally, acoustic testing is performed on the borehole to obtain acoustic data of the borehole, including: acoustic velocity testing of the borehole to obtain an acoustic velocity curve of the borehole.

[0007] Optionally, acoustic testing is performed on the borehole to obtain acoustic data of the borehole, including: ultrasonic imaging testing of the borehole to obtain ultrasonic imaging data of the surrounding rock of the borehole.

[0008] Optionally, before determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, the method further includes: performing a borehole caliper test to obtain the borehole caliper curve; determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, including: determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve, acoustic data, and caliper curve.

[0009] Optionally, after determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, the method further includes: determining the complete core section of the borehole based on the borehole core or core logging table; and determining the final in-situ stress test fracturing section based on the complete core section and the in-situ stress test fracturing section.

[0010] A second aspect of this application provides a device for selecting fracturing sections for in-situ stress testing. The device includes a testing module and a determination module. The testing module is used to perform potential resistivity testing on a borehole to obtain the potential resistivity curve of the surrounding rock of the borehole, and to perform acoustic wave testing on the borehole to obtain acoustic wave data of the borehole. The determination module is used to determine the fracturing section for in-situ stress testing based on the potential resistivity curve of the surrounding rock and the acoustic wave data.

[0011] Optionally, this test module is specifically used to perform acoustic velocity testing on the borehole to obtain the acoustic velocity curve of the borehole.

[0012] Optionally, this test module is specifically used to perform ultrasonic imaging tests on the borehole to obtain ultrasonic imaging data of the surrounding rock of the borehole.

[0013] Optionally, the testing module is also used to perform a borehole caliper test before determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, so as to obtain the borehole caliper curve; the determination module is specifically used to determine the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve, acoustic data, and caliper curve.

[0014] Optionally, the determining module is also used to determine the complete core section of the borehole based on the core or core logging table after determining the fracturing section for in-situ stress testing based on the surrounding rock potential resistivity curve and acoustic data; and to determine the final fracturing section for in-situ stress testing based on the complete core section and the fracturing section for in-situ stress testing.

[0015] A third aspect of this application provides an electronic device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the in-situ stress testing fracturing segment selection method as described in the first aspect.

[0016] A fourth aspect of this application provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the in-situ stress testing fracturing segment selection method as described in the first aspect.

[0017] A fifth aspect of this application provides a computer program product, wherein the computer program product includes a computer program or instructions, and when the computer program product is run on a processor, the processor executes the computer program or instructions to implement the steps of the in-situ stress testing fracturing section selection method as described in the first aspect.

[0018] A sixth aspect of this application provides a chip including a processor and a communication interface coupled to the processor. The processor is used to run programs or instructions to implement the in-situ stress testing fracturing section selection method as described in the first aspect.

[0019] The technical solution provided in this application has the following advantages compared with the prior art:

[0020] To address the aforementioned issues, this embodiment of the application obtains the surrounding rock potential resistivity curve by performing potential resistivity testing on the borehole; and obtains the borehole acoustic data by performing acoustic wave testing on the borehole; based on the surrounding rock potential resistivity curve and acoustic wave data, the in-situ stress testing fracturing section is determined. Because the potential resistivity of the surrounding rock can indirectly reflect the integrity of the surrounding rock within a certain range along the borehole axis, and the acoustic wave data of the borehole can also be used to further confirm the integrity of the surrounding rock, compared to core samples which only reflect the integrity of the surrounding rock at the borehole location, the in-situ stress testing fracturing section determined by combining the potential resistivity and acoustic wave data of the surrounding rock is more accurate, effective, and reliable. Furthermore, because it does not rely on core samples, it has greater versatility; potential resistivity testing and acoustic wave testing can be performed wherever there is a borehole. The testing is simple, has a high success rate, and can effectively improve the efficiency of selecting the in-situ stress testing fracturing section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments and the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and other drawings can be obtained based on these drawings.

[0022] Figure 1 One of the flowcharts for the method of selecting fracturing sections for in-situ stress testing provided in the embodiments of this application;

[0023] Figure 2 A second schematic flowchart illustrating the method for selecting fracturing sections for geostress testing provided in this application embodiment;

[0024] Figure 3 The third schematic flowchart of the method for selecting the fracturing section for in-situ stress testing provided in the embodiments of this application;

[0025] Figure 4 Schematic diagrams of potential resistivity curves, acoustic curves, and wellbore parameter curves provided in the embodiments of this application;

[0026] Figure 5 This is a schematic diagram of the ultrasound imaging test results provided in an embodiment of this application;

[0027] Figure 6 A structural block diagram of a fracturing section selection device for in-situ stress testing provided in this application embodiment;

[0028] Figure 7 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] Currently, the main method for determining the fracturing section in downhole stress testing is to examine core samples or borehole core logs. By observing the core samples or borehole core logs, the location of the complete core sample is identified as the fracturing section for stress testing within the borehole. However, this method has certain drawbacks and limitations: First, in actual stress testing, core samples are often stored in a centralized location, not near the borehole to be measured, leaving no core samples for testing personnel to examine upon arrival at the well site; second, the core logs for the entire borehole are often not yet compiled, resulting in a lack of data; finally, the core sample cannot represent the integrity of the rock within a certain range along the borehole axis, only providing a partial view of the borehole.

[0032] To address the aforementioned issues, this embodiment of the application obtains the surrounding rock potential resistivity curve by performing potential resistivity testing on the borehole; and obtains the borehole acoustic data by performing acoustic wave testing on the borehole; based on the surrounding rock potential resistivity curve and acoustic wave data, the in-situ stress testing fracturing section is determined. Because the potential resistivity of the surrounding rock can indirectly reflect the integrity of the surrounding rock within a certain range along the borehole axis, and the acoustic wave data of the borehole can also be used to further confirm the integrity of the surrounding rock, compared to core samples which only reflect the integrity of the surrounding rock at the borehole location, the in-situ stress testing fracturing section determined by combining the potential resistivity and acoustic wave data of the surrounding rock is more accurate, effective, and reliable. Furthermore, because it does not rely on core samples, it has greater versatility; potential resistivity testing and acoustic wave testing can be performed wherever there is a borehole. The testing is simple, has a high success rate, and can effectively improve the efficiency of selecting the in-situ stress testing fracturing section.

[0033] The electronic devices in this application embodiment can be mobile electronic devices or non-mobile electronic devices. Mobile electronic devices can be mobile phones, tablets, laptops, handheld computers, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc.; this application embodiment does not specifically limit them.

[0034] The execution subject of the geostress testing fracturing section selection method provided in this application embodiment can be the aforementioned electronic device, or it can be a functional module and / or functional entity in the electronic device that can realize the geostress testing fracturing section selection method. The specific implementation subject can be determined according to actual usage requirements, and this application embodiment does not limit it.

[0035] The method for selecting fracturing sections for geostress testing provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0036] like Figure 1 As shown in the figure, this application provides a method for selecting fracturing sections for in-situ stress testing. The following description uses an electronic device as the execution subject to illustrate the method for selecting fracturing sections for in-situ stress testing provided by this application. This method may include steps 101 to 103 as described below.

[0037] 101. Perform potential resistivity tests on the borehole to obtain the potential resistivity curve of the surrounding rock.

[0038] It is understood that performing potential resistivity testing on boreholes is called potential resistivity logging. Potential resistivity logging is a method of measuring the resistivity of the surrounding rock by using power supply electrodes and measuring electrodes arranged in different locations in the borehole. Potential resistivity logging includes methods such as conventional resistivity logging, lateral logging, and induction logging.

[0039] It is understandable that potential resistivity can indirectly reflect the integrity of the surrounding rock within a certain range along the borehole axis. The higher the potential resistivity and the smaller the range of change in potential resistivity, the more intact the surrounding rock and the smoother the borehole wall. Conversely, the lower the potential resistivity or the larger the range of change in potential resistivity, the worse the integrity of the surrounding rock and the more broken the borehole wall. Therefore, the potential resistivity curve can be used to determine the depth range of the relatively intact section of the surrounding rock in the borehole, and this depth range can be defined as the first fracturing section.

[0040] 102. Perform acoustic testing on the borehole to obtain acoustic data of the borehole.

[0041] It is understandable that acoustic data can also reflect the integrity of the surrounding rock.

[0042] Alternatively, the acoustic test can be an acoustic velocity test or an ultrasonic imaging test.

[0043] It is understandable that the second fracturing stage can be determined using acoustic data.

[0044] 103. Based on the surrounding rock potential resistivity curve and acoustic wave data, determine the in-situ stress test fracturing section.

[0045] It is understandable that by combining the first and second fracturing sections, the intersection of the first and second fracturing sections is taken as the fracturing section for in-situ stress testing. This not only demonstrates through potential resistivity testing that the surrounding rock of the selected fracturing section for in-situ stress testing is relatively intact and the borehole wall is smooth, but also further verifies through acoustic data that the fracturing section for in-situ stress testing determined by the intersection of the two is more accurate and reliable.

[0046] This is understandable, because if the surrounding rock in the borehole contains metallic minerals such as iron, gold, and copper, its resistivity is relatively low, which does not necessarily mean that the surrounding rock is relatively broken. Therefore, relying solely on potential resistivity to judge the integrity of the surrounding rock is sometimes not accurate enough. Thus, adding acoustic data as a basis for further judging the integrity of the surrounding rock more accurately determines the depth range of relatively intact sections of the surrounding rock in the borehole, thereby improving the accuracy of determining the fracturing section for in-situ stress testing.

[0047] Optionally, the length of the fracturing section in the geostress test is greater than or equal to the fracturing section threshold.

[0048] It is understandable that when using hydraulic fracturing to test in-situ stress, in order to increase the success rate and make the test results more accurate, the length of the fracturing section used for in-situ stress testing is limited, i.e., the fracturing section threshold. The fracturing section threshold can be determined according to actual engineering needs or based on historical experience, and this application does not impose specific limitations on it.

[0049] For example, in actual engineering, 3 meters is often selected as the threshold for the fracturing section. That is to say, the length of the fracturing section for in-situ stress testing should be greater than or equal to 3 meters.

[0050] To address the aforementioned issues, this embodiment of the application obtains the surrounding rock potential resistivity curve by performing potential resistivity testing on the borehole; and obtains the borehole acoustic data by performing acoustic wave testing on the borehole; based on the surrounding rock potential resistivity curve and acoustic wave data, the in-situ stress testing fracturing section is determined. Because the potential resistivity of the surrounding rock can indirectly reflect the integrity of the surrounding rock within a certain range along the borehole axis, and the acoustic wave data of the borehole can also be used to further confirm the integrity of the surrounding rock, compared to core samples which only reflect the integrity of the surrounding rock at the borehole location, the in-situ stress testing fracturing section determined by combining the potential resistivity and acoustic wave data of the surrounding rock is more accurate, effective, and reliable. Furthermore, because it does not rely on core samples, it has greater versatility; potential resistivity testing and acoustic wave testing can be performed wherever there is a borehole. The testing is simple, has a high success rate, and can effectively improve the efficiency of selecting the in-situ stress testing fracturing section.

[0051] For example, step 102 above can be implemented by step 102a below.

[0052] 102a. Perform acoustic velocity testing on the borehole to obtain the acoustic velocity curve of the borehole.

[0053] As can be understood, sonic velocity testing of boreholes is called sonic velocity logging, also known as sonic time-of-flight logging. It measures the longitudinal wave velocity in the sonic profile of the well, that is, the time required for the longitudinal wave in the sonic wave to propagate in the formation.

[0054] It is understandable that acoustic velocity can indirectly reflect the integrity of the surrounding rock within a certain range of the borehole axis. The larger the acoustic velocity value and the smaller the amplitude of the acoustic velocity variation, the more intact the surrounding rock and the smoother the borehole wall. Conversely, the smaller the acoustic velocity value or the larger the amplitude of the acoustic velocity variation, the poorer the integrity of the surrounding rock and the more fragmented the borehole wall. Therefore, the depth range of the relatively intact section of the surrounding rock in the borehole can be determined by the acoustic velocity curve, and this depth range is defined as the third fracturing section.

[0055] It can be understood that the third fracturing stage is the second fracturing stage in step 102 above.

[0056] It is understandable that the intersection of the first and third fracturing sections mentioned above is identified as the in-situ stress testing fracturing section. This is because the potential resistivity test shows that the surrounding rock of the selected in-situ stress testing fracturing section is relatively intact and the borehole wall is smooth. Furthermore, the sonic velocity test further confirms that the surrounding rock of this section is relatively intact and the borehole wall is relatively smooth. Therefore, the in-situ stress testing fracturing section determined in this way is more accurate and reliable.

[0057] For example, the first fracturing section determined by potential resistivity testing is a section with a depth of 50 to 60 meters in the borehole; the third fracturing section determined by sonic velocity testing is a section with a depth of 48 to 55 meters in the borehole; the intersection of the first fracturing section (50 to 60 meters) and the third fracturing section (48 to 55 meters) is 50 to 55 meters, so the finally determined fracturing section for in-situ stress testing is a section with a depth of 50 to 55 meters in the borehole.

[0058] In this embodiment, since acoustic velocity can also indirectly reflect the integrity of the surrounding rock within a certain range of the borehole axis, the intersection of the first fracturing segment determined by potential resistivity test and the second fracturing segment determined by acoustic velocity test is determined as the final in-situ stress test fracturing segment. The two are combined and mutually verified, and the determined in-situ stress test fracturing segment is more accurate.

[0059] Optionally, step 102 above can be implemented through step 102b below.

[0060] 102b. Perform ultrasonic imaging tests on the borehole to obtain ultrasonic imaging data of the surrounding rock of the borehole.

[0061] It is understandable that ultrasonic imaging testing (or ultrasonic television testing) uses the reflection characteristics of ultrasonic waves from the wellbore or casing inner wall to study the well profile.

[0062] It is understandable that ultrasonic imaging tests on the surrounding rock of the borehole can visualize the ultrasonic imaging data, which can intuitively reflect the surrounding rock of the borehole wall. The imaging image can clearly show the development of fractures in the surrounding rock, the changes in borehole diameter, and the integrity of the borehole wall. Therefore, ultrasonic imaging tests can determine the depth range of the relatively intact section of the surrounding rock in the borehole, and this depth range can be identified as the fourth fracturing section.

[0063] It can be understood that the fourth fracturing stage is the second fracturing stage in step 102 above.

[0064] It is understandable that the intersection of the first and fourth fracturing sections is identified as the in-situ stress testing fracturing section. This is because the potential resistivity test shows that the surrounding rock of the selected in-situ stress testing fracturing section is relatively intact and the borehole wall is smooth. Furthermore, the ultrasonic imaging test further confirms that the surrounding rock of this section is relatively intact and the borehole wall is relatively smooth. Therefore, the in-situ stress testing fracturing section determined in this way is more accurate and reliable.

[0065] For example, the first fracturing section determined by potential resistivity testing is a section with a depth of 50 to 60 meters in the borehole; the fourth fracturing section determined by ultrasonic imaging testing is a section with a depth of 48 to 55 meters in the borehole; the intersection of the first fracturing section (50 to 60 meters) and the fourth fracturing section (48 to 55 meters) is 50 to 55 meters, so the finally determined fracturing section for in-situ stress testing is a section with a depth of 50 to 55 meters in the borehole.

[0066] In this embodiment, because the images obtained by ultrasonic imaging tests on the borehole are visualized, the development of surrounding rock fractures, the change of borehole diameter, and the integrity of the borehole wall can be seen more intuitively. The intersection of the first fracturing segment determined by potential resistivity test and the fourth fracturing segment determined by ultrasonic imaging test is determined as the final in-situ stress test fracturing segment. The two are combined and mutually verified, and the determined in-situ stress test fracturing segment is more accurate and reliable.

[0067] Optionally, combined Figure 1 ,like Figure 2 As shown, step 102 above can be specifically implemented through steps 102c to 102d below.

[0068] 102c. Perform acoustic velocity testing on the borehole to obtain the acoustic velocity curve of the borehole.

[0069] 102d. Ultrasonic imaging tests were performed on the borehole to obtain ultrasonic imaging data of the surrounding rock.

[0070] It is understandable that the intersection of the first, third, and fourth fracturing sections is selected as the in-situ stress testing fracturing section. First, the potential resistivity test shows that the surrounding rock of the selected in-situ stress testing fracturing section is relatively intact and the borehole wall is smooth. Second, the acoustic velocity test shows that the surrounding rock of this section is relatively intact and the borehole wall is relatively smooth. Finally, the ultrasonic imaging test further confirms that the surrounding rock of this section is relatively intact and the borehole wall is relatively smooth. Therefore, the in-situ stress testing fracturing section determined in this way is more accurate and reliable.

[0071] For example, the first fracturing section determined by potential resistivity testing is a section with a depth of 50 to 60 meters in the borehole; the third fracturing section determined by acoustic velocity testing is a section with a depth of 52 to 58 meters in the borehole; and the fourth fracturing section determined by ultrasonic imaging testing is a section with a depth of 48 to 57 meters in the borehole. The intersection of the first fracturing section (50 to 60 meters), the third fracturing section (52 to 58 meters), and the fourth fracturing section (48 to 57 meters) is 52 to 57 meters. Therefore, the finally determined fracturing section for in-situ stress testing is a section with a depth of 52 to 57 meters in the borehole.

[0072] In this embodiment, the intersection of the first fracturing segment determined by potential resistivity testing, the third fracturing segment determined by acoustic velocity testing, and the fourth fracturing segment determined by ultrasonic imaging testing is used to determine the final in-situ stress testing fracturing segment. The three segments are combined and mutually verified, resulting in a more accurate and reliable in-situ stress testing fracturing segment.

[0073] Optionally, combined Figure 1 ,like Figure 3 As shown, before step 103 above, the method for selecting a fracturing section for geostress testing according to an embodiment of this application further includes step 104 below, and step 103 above can be implemented through step 105 below.

[0074] 104. Perform borehole caliper tests to obtain the borehole caliper curve.

[0075] It is understandable that wellbore testing refers to measuring the diameter of the borehole.

[0076] It is understandable that the size of the drilling tools used during the drilling process is known, so the overall borehole diameter is theoretically fixed. However, in actual drilling, the borehole diameter may change due to softer or fractured rock in some areas. Therefore, the borehole diameter curve can also reflect the integrity of the surrounding rock. In actual engineering, the packer (a tool used to isolate the fracturing section from other parts of the borehole) often breaks due to the increased borehole diameter during drilling. Selecting the depth range of the section with stable and appropriate borehole diameter values ​​and defining this depth range as the fifth fracturing section can improve the success rate of testing.

[0077] Optionally, the aperture size is greater than or equal to the aperture threshold.

[0078] It is understandable that when using hydraulic fracturing to test in-situ stress, in order to increase the success rate and make the test results more accurate, the diameter of the borehole used for testing is limited, i.e., a borehole diameter threshold. The borehole diameter threshold can be determined according to the actual engineering project, related to the depth of the borehole, or determined based on historical experience. This application does not impose specific limitations on this threshold.

[0079] For example, in actual engineering, 75mm is often selected as the borehole diameter threshold, that is, the diameter of the borehole required for ground stress testing is greater than or equal to 75mm.

[0080] 105. Based on the surrounding rock potential resistivity curve, acoustic data, and aperture curve, determine the fracturing section for in-situ stress testing.

[0081] It is understandable that the intersection of the first, second, and fifth fracturing sections is selected as the in-situ stress testing fracturing section. First, the potential resistivity test shows that the surrounding rock of the selected in-situ stress testing fracturing section is relatively intact and the borehole wall is smooth. Second, the acoustic wave test shows that the surrounding rock of this section is relatively intact and the borehole wall is relatively smooth. Finally, the well diameter test further shows that the surrounding rock of this section is relatively intact and the well diameter does not change much. Therefore, the in-situ stress testing fracturing section determined in this way is more accurate and reliable.

[0082] For example, the first fracturing section determined by potential resistivity testing is a section with a depth of 50 to 60 meters in the borehole; the third fracturing section determined by acoustic velocity testing is a section with a depth of 52 to 58 meters in the borehole; the fourth fracturing section determined by ultrasonic imaging testing is a section with a depth of 48 to 59 meters in the borehole; and the fifth fracturing section determined by borehole caliper testing is a section with a depth of 48 to 57 meters in the borehole. The intersection of the first fracturing section (50 to 60 meters), the third fracturing section (52 to 58 meters), the fourth fracturing section (48 to 59 meters), and the fifth fracturing section (48 to 57 meters) is 52 to 57 meters. Therefore, the finally determined fracturing section determined by in-situ stress testing is the section with a depth of 52 to 57 meters in the borehole.

[0083] For example, such as Figure 4 As shown, curve 401 represents the potential resistivity curve of the surrounding rock. It can be seen that between a depth of 304 meters and 314 meters, the potential resistivity of the surrounding rock is relatively low, with a large range of values, indicating that the surrounding rock in this section is relatively fragmented. Between a depth of 314 meters and 319 meters, the potential resistivity of the surrounding rock is relatively high, with a smaller range of values, indicating that the surrounding rock in this section is relatively intact. This section is identified as the first fracturing section. Curve 402 represents the wellbore diameter curve. Between a depth of 304 meters and 312 meters, the wellbore diameter value is unstable, with abrupt changes, indicating that the surrounding rock in this section is relatively fragmented. Between a depth of 312 meters and 320 meters, the wellbore diameter value is stable, indicating that the surrounding rock in this section is relatively intact and the well wall is smooth. This section is identified as the fifth fracturing section. Curve 403 is the acoustic velocity curve. The acoustic velocity varies significantly between 304 and 315 meters in depth, indicating that the surrounding rock in this section is relatively fragmented. Conversely, the acoustic velocity is higher and varies less between 315 and 320 meters in depth, indicating that the surrounding rock in this section is relatively intact and the wellbore wall is smooth. This section is identified as the third fracturing stage. Figure 5As shown, column 501 is a reflection amplitude map obtained from ultrasonic imaging. The wavy lines in the reflection amplitude map depict the surrounding rock fractures, representing the fracture development and attitude. The reflection amplitude map shows that at a depth of 309 to 313 meters, the surrounding rock fractures are well-developed, joints are severely cut, and the well diameter changes abruptly, indicating that the surrounding rock in this section is relatively fragmented with numerous fractures. At a depth of 313 to 317 meters, bedrock fractures are not well-developed, and the well diameter is stable, indicating that the surrounding rock in this section is relatively intact with a smooth well wall. This section is identified as the fourth fracturing section. Column 502 is a 3D simulation of the borehole. The slices in the image are simulated fracture slices, which visually represent the orientation, dip, and dip angle of the fractures in the reflection amplitude map. More slices indicate more surrounding rock fractures. The 3D simulation of the borehole reflects the same fracture development and attitude as the reflection amplitude map. Based on the combined potential resistivity curve, wellbore curve, acoustic velocity curve, and ultrasonic imaging test data, the intersection of the first, third, fourth, and fifth fracturing sections was determined as the final fracturing section for in-situ stress testing, i.e., the borehole depth is between 314 and 317 meters, the surrounding rock integrity is relatively good, and the well wall is smooth.

[0084] In this embodiment, the intersection of the first fracturing segment determined by potential resistivity testing, the third fracturing segment determined by acoustic velocity testing, the fourth fracturing segment determined by ultrasonic imaging testing, and the fifth fracturing segment determined by wellbore testing is taken as the final in-situ stress testing fracturing segment. The combination of the four segments verifies each other, which improves the success rate of the test and makes the determined in-situ stress testing fracturing segment more accurate and reliable.

[0085] Optionally, after step 103 above, the method for selecting a fracturing section for geostress testing according to an embodiment of this application further includes steps 106 and 107 below.

[0086] 106. Based on the borehole core or core logging table, determine the complete section of the borehole core.

[0087] It is understandable that the core sample from the borehole refers to the columnar rock mass extracted from the borehole during the drilling process. The integrity of the core sample can reflect the integrity of the surrounding rock in the corresponding borehole. Therefore, the depth range of the borehole corresponding to the section with better core sample integrity can be determined as the sixth fracturing section.

[0088] It is understandable that the core logging table records parameters related to the core, such as the core's integrity, fracture orientation, and color.

[0089] 107. Based on the intact core section and the in-situ stress test fracturing section, determine the final in-situ stress test fracturing section.

[0090] It is understandable that the intersection of the in-situ stress test fracturing section determined in steps 101 to 105 above and the sixth fracturing section is determined as the final in-situ stress test fracturing section. Through mutual verification by potential resistivity test, sonic velocity test, ultrasonic imaging test, well diameter test, and core or core logging table, it is concluded that the selected in-situ stress test fracturing section has relatively intact surrounding rock and smooth borehole wall. Therefore, the in-situ stress test fracturing section determined in this way is more accurate and reliable.

[0091] For example, the in-situ stress test fracturing section determined by steps 101 to 105 above is a section with a depth of 52 meters to 57 meters in the borehole; the sixth fracturing section determined by the core or core logging table is a section with a depth of 53 meters to 60 meters in the borehole; the intersection of the two is taken, and the finally determined in-situ stress test fracturing section is a section with a depth of 53 meters to 57 meters.

[0092] In this embodiment, the sixth fracturing segment determined by the rock core or rock core logging table and the in-situ stress test fracturing segment determined by steps 101 to 105 above are intersected to determine the final in-situ stress test fracturing segment. Taking all factors into account and verifying each other, the determined in-situ stress test fracturing segment is more accurate and reliable.

[0093] Figure 6 This is a structural block diagram of a fracturing section selection device for in-situ stress testing, as shown in an embodiment of this application. Figure 6 As shown, it includes: a test module 601 and a determination module 602; the test module 601 is used to perform potential resistivity testing on the borehole to obtain the potential resistivity curve of the surrounding rock of the borehole; and to perform acoustic wave testing on the borehole to obtain acoustic wave data of the borehole; the determination module 602 is used to determine the in-situ stress test fracturing section based on the potential resistivity curve of the surrounding rock and the acoustic wave data.

[0094] Optionally, the test module 601 is specifically used for drilling to perform acoustic velocity testing and obtain the acoustic velocity curve of the borehole.

[0095] Optionally, the test module 601 is specifically used to perform ultrasonic imaging tests on the borehole to obtain ultrasonic imaging data of the surrounding rock of the borehole.

[0096] Optionally, the testing module 601 is also used to perform a borehole diameter test before determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, to obtain the borehole diameter curve; the determining module 602 is specifically used to determine the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve, acoustic data, and the diameter curve.

[0097] Optionally, the determining module 602 is further configured to, after determining the in-situ stress test fracturing section based on the surrounding rock potential resistivity curve and acoustic data, determine the complete core section of the borehole based on the core or core logging table; and determine the final in-situ stress test fracturing section based on the complete core section and the in-situ stress test fracturing section.

[0098] It should be noted that the above-mentioned in-situ stress testing fracturing section selection device can be the electronic device in the above method embodiment of this application, or it can be a functional module and / or functional entity in the electronic device that can realize the function of the device embodiment. This application embodiment does not limit it.

[0099] In this embodiment, each module can implement the in-situ stress testing fracturing section selection method provided in the above method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0100] This application embodiment also provides an electronic device, which may include: a processor 701, a memory 702, and a program or instructions stored in the memory 702 and executable on the processor 701. When the program or instructions are executed by the processor 701, they can implement the various processes of the in-situ stress testing fracturing section selection method provided in the above method embodiment, and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0101] This application provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the in-situ stress testing fracturing section selection method provided in the above-described method embodiments and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0102] This application also provides a computer program product, which includes a computer program or instructions. When the computer program product is run on a processor, the processor executes the computer program or instructions to implement the various processes of the in-situ stress testing fracturing section selection method provided in the above method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0103] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above-described embodiment of the method for selecting fracturing sections for geostress testing, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0104] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, servers, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0106] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0108] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0109] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for selecting fracturing sections for in-situ stress testing, characterized in that, The method includes: Potential resistivity tests were performed on the borehole to obtain the surrounding rock potential resistivity curve of the borehole; The borehole is subjected to acoustic wave testing to obtain acoustic wave data of the borehole; wherein, the acoustic wave testing includes acoustic wave velocity testing, which is used to measure the longitudinal wave velocity in the acoustic wave of the well profile. Based on the surrounding rock potential resistivity curve and the acoustic wave data, a ground stress test fracturing segment is determined; wherein, the ground stress test fracturing segment is obtained by taking the intersection of the first fracturing segment determined by the surrounding rock potential resistivity curve and the second fracturing segment determined by the acoustic wave data.

2. The method according to claim 1, characterized in that, The step of performing acoustic testing on the borehole to obtain acoustic data of the borehole includes: The borehole was subjected to acoustic velocity testing to obtain the acoustic velocity curve of the borehole.

3. The method according to claim 1 or 2, characterized in that, The step of performing acoustic testing on the borehole to obtain acoustic data of the borehole includes: Ultrasonic imaging tests were performed on the borehole to obtain ultrasonic imaging data of the surrounding rock.

4. The method according to claim 1 or 2, characterized in that, After determining the in-situ stress testing fracturing section based on the surrounding rock potential resistivity curve and the acoustic data, the method further includes: Based on the core samples or core logging tables from the borehole, determine the complete core segments of the borehole; Based on the complete core section and the in-situ stress test fracturing section, the final in-situ stress test fracturing section is determined.

5. A device for selecting fracturing sections for in-situ stress testing, characterized in that, The device includes: a testing module and a determination module; The testing module is used to perform potential resistivity testing on the borehole to obtain the surrounding rock potential resistivity curve of the borehole; and to perform acoustic wave testing on the borehole to obtain acoustic wave data of the borehole; wherein, the acoustic wave testing includes acoustic wave velocity testing, which is used to measure the longitudinal wave velocity in the acoustic wave of the well profile. The determining module is used to determine the in-situ stress test fracturing segment based on the surrounding rock potential resistivity curve and the acoustic wave data; wherein the in-situ stress test fracturing segment is obtained by taking the intersection of the first fracturing segment determined by the surrounding rock potential resistivity curve and the second fracturing segment determined by the acoustic wave data.

6. The apparatus according to claim 5, characterized in that, The test module is specifically used for: The borehole was subjected to acoustic velocity testing to obtain the acoustic velocity curve of the borehole.

7. The apparatus according to claim 5 or 6, characterized in that, The test module is specifically used for: Ultrasonic imaging tests were performed on the borehole to obtain ultrasonic imaging data of the surrounding rock.

8. An electronic device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the geostress testing fracturing segment selection method as described in any one of claims 1 to 4.

9. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the geostress testing fracturing segment selection method as described in any one of claims 1 to 4.

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