Coal seam fracturing crack extension direction prediction method and device, medium and electronic equipment
By constructing the micro-stress field of the coal seam, predicting the extension direction of the coal seam fracturing, the problem of insufficient prediction accuracy in the prior art is solved, and the effectiveness of exploration and development is improved.
Patent Information
- Application Number
- CN202311760074.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-20
- Publication Date
- 2025-06-20
AI Technical Summary
The prior art is difficult to quickly and efficiently predict the extension direction of coal seam fracturing, which affects the effectiveness of coal seam exploration and development.
By obtaining the logging parameters of the target layer in the coal seam, a model of vertical thickness, top surface altitude and Young's modulus is constructed, the curvature model is fitted, and the micro-stress field is established, and the direction of extension of the fracturing is predicted.
The prediction accuracy of the extension direction of coal seam fracturing is improved, and a geological basis is provided for the selection of wells and layers and fracturing schemes in oil and gas fields.
Smart Images
Figure CN120180651A_ABST
Abstract
Description
Background Art
[0002] At present, the distribution law of the coal seam stress field plays a more important guiding role in the exploration and development of coal seams. The magnitude of the coal seam stress determines the geometric shape and scale of the artificial fractures formed during hydraulic fracturing. Therefore, how to quickly and efficiently predict the extension direction of the fracture is a technical problem to be solved urgently. Summary of the Invention
[0003] The purpose of this application is to provide a method, device, medium and electronic equipment for predicting the extension direction of coal seam fracture. This application can improve the accuracy of predicting the extension direction of the fracture.
[0004] Other characteristics and advantages of this application will become obvious through the following detailed description, or be learned partially through the practice of this application.
[0005] According to one aspect of the embodiments of this application, a method for predicting the extension direction of coal seam fracture is provided. The method is characterized in that the method includes: obtaining the vertical thickness, top surface elevation and Young's modulus corresponding to the target layer in the coal seam according to the well logging parameters obtained by actual measurement; respectively constructing a thickness model, a top surface structure model and a Young's modulus parameter field corresponding to the vertical thickness, the top surface elevation and the Young's modulus; constructing a curvature model, and the curvature model is constructed by the curvature parameters obtained by fitting the top surface structure model; constructing a micro stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field and the curvature model; predicting the extension direction of the fracture corresponding to the target layer based on the micro stress field.
[0006] In an embodiment of this application, based on the foregoing solution, constructing the Young's modulus parameter field includes: performing dynamic-static conversion on the Young's modulus and obtaining the static Young's modulus; constructing the Young's modulus parameter field according to the static Young's modulus.
[0007] In an embodiment of this application, based on the foregoing solution, the predicting the extension direction of the fracture corresponding to the target layer based on the micro stress field includes: determining the high stress area and the low stress area corresponding to the target layer according to the micro stress field; predicting the extension direction of the fracture corresponding to the target layer based on the high stress area and the low stress area.
[0008] In an embodiment of this application, based on the foregoing solution, according to the micro stress field, it is determined that the high stress area is distributed on the northwest side and the southeast side of the target layer, the low stress area is distributed on the southwest side and the northeast side of the target layer, and the extension direction of the fracture corresponding to the target layer is northeast.
[0009] In an embodiment of the present application, based on the foregoing solution, according to the micro-stress field, it is determined that the high-stress regions are distributed on the west side and the east side of the target layer, the low-stress regions are distributed on the south side and the north side of the target layer, and the extension direction of the hydraulic fracture corresponding to the target layer is northward.
[0010] In an embodiment of the present application, based on the foregoing solution, according to the micro-stress field, it is determined that the high-stress regions are distributed on the southwest side and the northeast side of the target layer, the low-stress regions are distributed on the northwest side and the southeast side of the target layer, and the extension direction of the hydraulic fracture corresponding to the target layer is northwestward.
[0011] In an embodiment of the present application, based on the foregoing solution, the micro-stress corresponding to the target layer is calculated by a micro-stress calculation formula, including:
[0012]
[0013] Wherein, σ represents the micro-stress; d represents the vertical thickness of the target layer; E represents the static Young's modulus of the target layer; R represents the radius of curvature; K represents the curvature.
[0014] According to one aspect of the embodiments of the present application, there is provided a device for predicting the extension direction of a coal seam hydraulic fracture, characterized in that the device includes: an acquisition unit for acquiring the vertical thickness, the top elevation and the Young's modulus corresponding to the target layer in the coal seam according to the well logging parameters obtained by actual measurement; a first construction unit for respectively constructing a thickness model, a top surface structure model and a Young's modulus parameter field corresponding to the vertical thickness, the top elevation and the Young's modulus; a second construction unit for constructing a curvature model, the curvature model being constructed by the curvature parameters obtained by fitting the top surface structure model; a third construction unit for constructing a micro-stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field and the curvature model; and a prediction unit for predicting the extension direction of the hydraulic fracture corresponding to the target layer based on the micro-stress field.
[0015] According to one aspect of the embodiments of the present application, there is provided a computer-readable storage medium, on which a computer program is stored, the computer program including executable instructions, and when the executable instructions are executed by a processor, the method described in the above embodiments is implemented.
[0016] According to one aspect of the embodiments of the present application, there is provided an electronic device, including: one or more processors; a memory for storing executable instructions of the processor, and when the executable instructions are executed by the one or more processors, the one or more processors implement the method described in the above embodiments.
[0017] In the present application, first, logging parameters corresponding to the target layer are obtained. According to the logging parameters, the vertical thickness, top surface elevation, and Young's modulus corresponding to the target layer are obtained, and thus a thickness model, a top surface structure model, and a Young's modulus parameter field are respectively constructed. Then, based on the top surface structure model, the top surface structure trend surface in the target layer is fitted to obtain the curvature parameters corresponding to the target layer for constructing a curvature model. According to the thickness model, the top surface structure model, the Young's modulus parameter field, and the curvature model, a micro-stress field is constructed. Based on the constructed micro-stress field, the pressures corresponding to each position in the target layer are obtained, and thus the extension direction of the pressure fracture corresponding to the target layer is predicted.
[0018] Based on this, through the micro-stress field, the coal seam micro-stresses corresponding to each position in the target layer can be accurately calculated, so that the extension direction of the corresponding pressure fractures in the coal seam can be predicted according to the calculated micro-stresses, thereby providing a geological basis for well and layer selection in oil and gas field measures and optimizing the fracturing plan.
[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:
[0021] Figure 1 is a flowchart of a method for predicting the extension direction of a coal seam pressure fracture shown in an embodiment of the present application;
[0022] Figure 2 is a schematic diagram of the stress of the target layer shown in an embodiment of the present application;
[0023] Figure 3 is a thickness model shown in an embodiment of the present application;
[0024] Figure 4 is a top surface elevation model shown in an embodiment of the present application;
[0025] Figure 5 is a Young's modulus parameter field shown in an embodiment of the present application;
[0026] Figure 6 is a curvature model shown in an embodiment of the present application;
[0027] Figure 7is the micro-stress field shown according to the embodiments of the present application;
[0028] Figure 8 is the schematic diagram of the micro-stress distribution and the actual fracture extension shown according to the embodiments of the present application;
[0029] Figure 9 is the block diagram of the device for predicting the extension direction of the coal seam fracture shown according to the embodiments of the present application;
[0030] Figure 10 is the schematic diagram of the system structure of the electronic device shown according to the embodiments of the present application. Detailed Embodiments
[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art.
[0032] In addition, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present application. However, those skilled in the art will realize that the technical solutions of the present application can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present application.
[0033] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.
[0034] The flowcharts shown in the drawings are only illustrative and do not necessarily include all the contents and operations / steps, nor do they necessarily have to be executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.
[0035] It should be noted that: "a plurality of" mentioned herein refers to two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.
[0036] The implementation details of the technical solution of the embodiments of the present application are elaborated in detail as follows:
[0037] According to one aspect of the present application, a method for predicting the extension direction of a coal seam hydraulic fracture is provided. Figure 1 FIG. is a flowchart of the method for predicting the extension direction of a coal seam hydraulic fracture shown in the embodiments of the present application. The method for predicting the extension direction of a coal seam hydraulic fracture can be executed by a device with computing and processing capabilities. The method for predicting the extension direction of a coal seam hydraulic fracture at least includes steps 110 to 150, which are introduced in detail as follows:
[0038] In step 110, according to the logging parameters obtained by actual measurement, the vertical thickness, top surface elevation, and Young's modulus corresponding to the target layer are acquired.
[0039] In the present application, referring to Figure 2 , FIG. 200 is a schematic diagram of the stress of the target layer shown in the embodiments of the present application. When there is no extrusion or tension in the horizontal direction at the target layer, the horizontal stress is zero. When the target layer is bent under force, the tensile strength at the top of the formation is enhanced, the compressive strength at the bottom of the formation is enhanced, and the upper and lower parts are respectively tensile and compressive forces, so there is no stress on the neutral plane. Based on this, the micro-stress field corresponding to the target layer can be obtained by the vertical thickness, top surface elevation, Young's modulus, and curvature of the coal seam. Among them, the curvature is the limit of the angle turned by the tangent on the unit arc, which can quantitatively describe the structural characteristics of the coal seam and judge the degree of structural deformation of the coal seam. The Young's modulus is the proportional coefficient between the elastic deformation degree and the stress when the coal seam is under force.
[0040] Continuing to refer to Figure 1 , in step 120, a thickness model, a top surface structure model, and a Young's modulus parameter field corresponding to the vertical thickness, the top surface elevation, and the Young's modulus are respectively constructed.
[0041] In the present application, referring to Figure 3 , FIG. 300 is a thickness model shown in the embodiments of the present application. Referring to Figure 4 , FIG. 400 is a top surface elevation model shown in the embodiments of the present application. Referring to Figure 5 , FIG. 500 is a Young's modulus parameter field shown in the embodiments of the present application.
[0042] In Figure 3 , according to the obtained vertical thickness, the thickness model is constructed. Through the thickness model, the reservoir thickness corresponding to the target layer can be known.
[0043] In Figure 4 , according to the obtained top surface elevation, the top surface elevation model is constructed. Through the top surface elevation model, the top surface elevation corresponding to the target layer can be known.
[0044] InFigure 5 Among them, according to the obtained Young's modulus, the Young's modulus parameter field is constructed. Through the Young's modulus parameter field, the Young's modulus corresponding to the target layer can be known.
[0045] Furthermore, when constructing the Young's modulus parameter field, the dynamic-static conversion of the Young's modulus is performed to obtain the static Young's modulus. According to the static Young's modulus, the Young's modulus parameter field is constructed.
[0046] Continue to refer to Figure 1 , in step 130, a curvature model is constructed, and the curvature model is constructed by the curvature parameters obtained by fitting the top surface structure model.
[0047] In this application, after constructing the top surface elevation model, based on the top surface structure model and combined with the top surface structure trend surface of the target layer, the curvature corresponding to the target layer can be fitted. According to the curvature, the curvature model corresponding to the target layer can be constructed. Refer to Figure 6 , which is the curvature model 600 shown according to the embodiment of this application.
[0048] Continue to refer to Figure 1 , in step 140, according to the thickness model, the top surface structure model, the Young's modulus parameter field and the curvature model, a micro-stress field is constructed.
[0049] In this application, refer to Figure 7 , which is the micro-stress field 700 shown according to the embodiment of this application. After constructing the micro-stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field and the curvature model, the micro-stress corresponding to each position in the target layer can be obtained through the micro-stress field.
[0050] Furthermore, in an embodiment of this application, the micro-stress corresponding to the target layer can be calculated by the following formula:
[0051]
[0052] Among them, σ represents the micro-stress; d represents the vertical thickness of the target layer; E represents the static Young's modulus of the target layer; R represents the radius of curvature; K represents the curvature.
[0053] Continue to refer to Figure 1 , in step 150, based on the micro-stress field, the extension direction of the pressure fracture corresponding to the target layer is predicted.
[0054] In this application, after obtaining the micro-stress field, the micro-stress corresponding to each position in the target layer can be determined according to the micro-stress field, so as to predict the extension direction of the pressure fracture in the target layer according to the distribution of the micro-stress.
[0055] In one embodiment of the present application, predicting the fracture extension direction corresponding to the target layer based on the micro stress field specifically includes steps 151 to 152:
[0056] Step 151: Determine the high stress area and the low stress area corresponding to the target layer according to the micro stress field.
[0057] Step 152: Predict the fracture extension direction corresponding to the target layer based on the high stress area and the low stress area.
[0058] In this embodiment, based on the micro stress field, the fracture extension direction in the target layer can be predicted. Among them, when predicting the fracture extension direction, since the fracture half-length corresponding to the coalbed methane well is generally less than 200 m. Therefore, a single-well micro stress field within a range of 200 m can be intercepted with the coalbed methane well in the target layer as the center. In addition, since the fracture as a whole extends towards the low stress area side, the fracture extension direction can be determined directionally through the stress magnitude distribution of the single-well micro stress field. Therefore, the fracture extension direction corresponding to the target layer can be predicted by determining the high stress area and the low stress area corresponding to the target layer.
[0059] Specifically, referring to Figure 8 , it is a schematic diagram 800 of the micro stress distribution and the actual fracture extension shown according to the embodiment of the present application. Referring to Figure 8 in Figure 8-1 , according to the micro stress field, it is determined that the high stress area is distributed on the northwest side and the southeast side of the target layer, the low stress area is distributed on the southwest side and the northeast side of the target layer, and the fracture extension direction corresponding to the target layer is northeast. In addition, continuing to refer to Figure 8 in Figure 8-1 , according to the actual fracture extension direction and the predicted fracture extension direction, the prediction coincidence degree can be calculated, so as to evaluate the accuracy of the predicted fracture extension direction. As in Figure 8-1 , the prediction coincidence degree corresponding to the actual fracture extension direction and the predicted fracture extension direction is 95%.
[0060] Furthermore, in another embodiment of the present application, referring to Figure 8 in Figure 8-2 , according to the micro stress field, it is determined that the high stress area is distributed on the west side and the east side of the target layer, the low stress area is distributed on the south side and the north side of the target layer, and the fracture extension direction corresponding to the target layer is north. In addition, continuing to refer to Figure 8 in Figure 8-2,Based on the actual fracture extension direction and the predicted fracture extension direction, the prediction coincidence degree can be calculated to evaluate the accuracy of the predicted fracture extension direction. For example, Figure 8-2 In it, the prediction coincidence degree corresponding to the actual fracture extension direction and the predicted fracture extension direction is 89%.
[0061] Furthermore, in another embodiment of the present application, referring to Figure 8 in Figure 8-3 , according to the micro stress field, it is determined that the high stress area is distributed on the southwest side and the northeast side of the target layer, the low stress area is distributed on the northwest side and the southeast side of the target layer, and the fracture extension direction corresponding to the target layer is northwest. Additionally, continuing to refer to Figure 8 in Figure 8-3 ,Based on the actual fracture extension direction and the predicted fracture extension direction, the prediction coincidence degree can be calculated to evaluate the accuracy of the predicted fracture extension direction. For example, Figure 8-3 In it, the prediction coincidence degree corresponding to the actual fracture extension direction and the predicted fracture extension direction is 92%.
[0062] The following introduces the device embodiments of the present application, which can be used to execute the coal seam fracture extension direction prediction method in the above embodiments of the present application. For the details not disclosed in the device embodiments of the present application, please refer to the embodiments of the coal seam fracture extension direction prediction method above of the present application.
[0063] Figure 9 It is a block diagram of a coal seam fracture extension direction prediction device shown according to an embodiment of the present application.
[0064] Referring to Figure 9 shown, according to a coal seam fracture extension direction prediction device 900 of an embodiment of the present application, the device 900 includes: an acquisition unit 901, configured to acquire the vertical thickness, top surface elevation, and Young's modulus corresponding to the target layer in the coal seam according to the actually measured logging parameters; a first construction unit 902, configured to respectively construct a thickness model, a top surface structure model, and a Young's modulus parameter field corresponding to the vertical thickness, the top surface elevation, and the Young's modulus; a second construction unit 903, configured to construct a curvature model, and the curvature model is constructed by using the curvature parameters obtained by fitting the top surface structure model; a third construction unit 904, configured to construct a micro stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field, and the curvature model; a prediction unit 905, configured to predict the fracture extension direction corresponding to the target layer based on the micro stress field.
[0065] As another aspect, the present application also provides a computer-readable storage medium, on which a program product capable of implementing the above methods in this specification is stored. In some possible implementation manners, various aspects of the present application can also be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to cause the terminal device to execute the steps according to various exemplary embodiments of the present application described in the above "Exemplary Method" section of this specification.
[0066] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which readable program code is carried. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable signal medium may also be any readable medium other than a readable storage medium, and this readable medium may send, propagate, or transmit a program used by or in conjunction with an instruction execution system, apparatus, or device.
[0067] The program code contained on the readable medium can be transmitted by any appropriate medium, including but not limited to wireless, wired, optical fiber cable, RF, etc., or any suitable combination of the above.
[0068] The program code for performing the operations of the present application can be written in any combination of one or more programming languages. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as an independent software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, by using an Internet service provider to connect through the Internet).
[0069] As another aspect, the present application also provides an electronic device capable of implementing the above method.
[0070] Those skilled in the art can understand that various aspects of the present application can be implemented as a system, a method, or a program product. Therefore, various aspects of the present application can be specifically implemented in the following forms, namely: a complete hardware implementation manner, a complete software implementation manner (including firmware, microcode, etc.), or an implementation manner combining hardware and software aspects, which can be collectively referred to as "circuit", "module", or "system" here.
[0071] Figure 10 FIG. 1 is a schematic diagram of the system structure of an electronic device according to an embodiment of the present application. The following will be described with reference to Figure 10 FIG. 2 to describe the electronic device 1000 according to this embodiment of the present application. Figure 10 The electronic device 1000 shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.
[0072] As Figure 10 shown, the electronic device 1000 is presented in the form of a general computing device. The components of the electronic device 1000 may include, but are not limited to: at least one of the above-mentioned processing units 1010, at least one of the above-mentioned storage units 1020, and a bus 1030 connecting different system components (including the storage unit 1020 and the processing unit 1010).
[0073] Among them, the storage unit stores program codes, and the program codes can be executed by the processing unit 1010, so that the processing unit 1010 executes the steps according to various exemplary embodiments of the present application described in the "Embodiment Method" section of the present specification.
[0074] The storage unit 1020 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 1021 and / or a cache storage unit 1022, and may further include a read-only storage unit (ROM) 1023.
[0075] The storage unit 1020 may further include a program / utility 1024 having a set (at least one) of program modules 1025. Such program modules 1025 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. The implementation of a network environment may be included in each or some combination of these examples.
[0076] The bus 1030 may represent one or more of several types of bus structures, including a storage unit bus or a storage unit controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any bus structure in a variety of bus structures.
[0077] The electronic device 1000 can also communicate with one or more external devices 1200 (such as a keyboard, a pointing device, a Bluetooth device, etc.), and can also communicate with one or more devices that enable a user to interact with the electronic device 1000, and / or communicate with any device that enables the electronic device 1000 to communicate with one or more other computing devices (such as a router, a modem, etc.). Such communication can be carried out through the input / output (I / O) interface 1050. Moreover, the electronic device 1000 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through the network adapter 1060. As shown in the figure, the network adapter 1060 communicates with other modules of the electronic device 1000 through the bus 1030. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 1000, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.
[0078] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or can be implemented by the way of software in combination with necessary hardware. Therefore, the technical solutions according to the embodiments of the present application can be embodied in the form of a software product, and the software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present application.
[0079] In addition, the above drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, rather than for limiting purposes. It is easy to understand that the processes shown in the above drawings do not indicate or limit the time sequence of these processes. Additionally, it is also easy to understand that these processes can be executed synchronously or asynchronously in, for example, multiple modules.
[0080] It should be understood that the present application is not limited to the exact structures that have been described and shown in the drawings above, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.
Claims
1. A method for predicting the propagation direction of coal seam hydraulic fractures, characterized in that, The method includes: Obtaining the vertical thickness, top surface elevation, and Young's modulus corresponding to the target layer in the coal seam according to the logging parameters obtained from actual measurement; Respectively constructing a thickness model, a top surface structure model, and a Young's modulus parameter field corresponding to the vertical thickness, the top surface elevation, and the Young's modulus; Constructing a curvature model, where the curvature model is constructed by the curvature parameters obtained by fitting the top surface structure model; Constructing a micro-stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field, and the curvature model; Predicting the extension direction of the hydraulic fracture corresponding to the target layer based on the micro-stress field.
2. The method according to claim 1, characterized in that, Constructing the Young's modulus parameter field includes: Performing dynamic-static conversion on the Young's modulus and obtaining the static Young's modulus; Constructing the Young's modulus parameter field according to the static Young's modulus.
3. The method according to claim 1, characterized in that, The predicting the extension direction of the hydraulic fracture corresponding to the target layer based on the micro-stress field includes: Determining the high-stress area and the low-stress area corresponding to the target layer according to the micro-stress field; Predicting the extension direction of the hydraulic fracture corresponding to the target layer based on the high-stress area and the low-stress area.
4. The method according to claim 3, characterized in that, According to the micro-stress field, it is determined that the high-stress area is distributed on the northwest side and the southeast side of the target layer, the low-stress area is distributed on the southwest side and the northeast side of the target layer, and the extension direction of the hydraulic fracture corresponding to the target layer is northeastward.
5. The method according to claim 3, characterized in that, According to the micro-stress field, it is determined that the high-stress area is distributed on the west side and the east side of the target layer, the low-stress area is distributed on the south side and the north side of the target layer, and the extension direction of the hydraulic fracture corresponding to the target layer is northward.
6. The method according to claim 3, characterized in that, According to the micro-stress field, it is determined that the high-stress area is distributed on the southwest side and the northeast side of the target layer, the low-stress area is distributed on the northwest side and the southeast side of the target layer, and the extension direction of the hydraulic fracture corresponding to the target layer is northwestward.
7. The method according to claim 1, characterized in that, Calculating the micro-stress corresponding to the target layer through a micro-stress calculation formula, including: where σ represents the micro-stress; d represents the vertical thickness of the target layer; E represents the static Young's modulus of the target layer; R represents the radius of curvature; K represents the curvature.
8. A device for predicting the propagation direction of coal seam hydraulic fractures, characterized in that, The device includes: An obtaining unit, configured to obtain the vertical thickness, top surface elevation, and Young's modulus corresponding to the target layer in the coal seam according to the logging parameters obtained from actual measurement; A first construction unit, configured to respectively construct a thickness model, a top surface structure model, and a Young's modulus parameter field corresponding to the vertical thickness, the top surface elevation, and the Young's modulus; A second construction unit, configured to construct a curvature model, where the curvature model is constructed by the curvature parameters obtained by fitting the top surface structure model; A third construction unit, configured to construct a micro-stress field according to the thickness model, the top surface structure model, the Young's modulus parameter field, and the curvature model; A predicting unit, configured to predict the extension direction of the hydraulic fracture corresponding to the target layer based on the micro-stress field.
9. A computer-readable storage medium, characterized in that, At least one program code is stored in the computer-readable storage medium, and the at least one program code is loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.
10. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, and at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by the method according to any one of claims 1 to 7.