Infill well fracturing design method, system, equipment and medium based on available area

Abstract

The present invention discloses a method, system, equipment and medium for designing infill well fracturing based on available areas, and belongs to the technical field of unconventional natural gas exploration and development. The method comprises the following steps: S1: establishing an infill well fracturing parameter design model for a target block; S2: simulating the production process of an implemented well network to obtain the pressure field before infill well fracturing; S3: carrying out four-dimensional stress dynamic calculation in the process of oil and gas reservoir exploitation to obtain stress evolution results, and updating relevant geological parameters in the model according to the stress evolution results; S4: identifying the available area of ​​the infill well in the updated infill well fracturing parameter design model; S5: classifying the fracturing sections of the infill well according to the available area of ​​the infill well, and designing differentiated fracturing construction parameters for each level of fracturing sections after classification. The present invention can carry out a more sophisticated differentiated fracturing design for infill wells, while improving the fracturing effect of infill wells and avoiding pressure channeling, thereby increasing the overall production capacity of the infill well group.

Description

Technical Field

[0001] The present invention relates to the technical field of unconventional natural gas exploration and development, and in particular to a method, system, equipment and medium for designing infill well fracturing based on a movable area. Background Art

[0002] In recent years, with the gradual reduction of conventional oil and gas resources, the development of unconventional oil and gas resources such as shale gas has gradually become an important part of the global energy supply. In China, after more than ten years of development, medium and deep shale gas resources represented by Changning shale gas are facing the challenges of rapid decline in gas wells and difficulty in stabilizing production. In order to improve recovery and economic benefits, infill well fracturing technology has become an important issue that needs to be solved urgently. This technology aims to achieve effective utilization of remaining reserves by adding new wellbores between the original development wells and fracturing the new wells.

[0003] The production of old wells leads to changes in the ground stress around the infill wells, which will have a significant impact on the fracture morphology and its expansion capacity. It is necessary to conduct in-depth research on it and improve the fracturing effect through fracturing optimization design. At present, the conventional fracturing design of infill wells mostly changes different fracturing construction parameters, conducts a large number of numerical simulations, compares the reservoir transformation volume under various construction parameter combinations, and obtains the optimized fracturing construction parameters of the infill wells. This type of method requires a lot of calculations, and the goal of maximizing the effective transformation volume of the reservoir in the infill wells only represents the improvement of the fracturing effect of the infill wells, and often fails to take into account the overall production capacity of the well group. Summary of the invention

[0004] In view of the above problems, the present invention aims to provide a method, system, equipment and medium for designing infill well fracturing based on the mobilizable area.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect, a method for designing an infill well fracturing based on an available area is provided, comprising the following steps:

[0007] S1: Establish a fracturing parameter design model for infill wells in the target block;

[0008] S2: simulating the production process of the implemented well pattern based on the infill well fracturing parameter design model to obtain the pressure field before the infill well fracturing;

[0009] S3: performing a four-dimensional stress dynamic calculation in the oil and gas reservoir exploitation process according to the pressure field, obtaining stress evolution results, and updating relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results;

[0010] S4: Identify the area of ​​the infill wells that can be mobilized in the updated infill well fracturing parameter design model;

[0011] S5: Classifying the fracturing sections of the infill wells according to the available area of ​​the infill wells, and designing differentiated fracturing construction parameters for the classified fracturing sections.

[0012] Preferably, in step S1, the infill well fracturing parameter design model includes a reservoir property model, a geomechanical model, a natural fracture model and a parent well pattern model.

[0013] Preferably, the reservoir physical property model includes porosity, permeability and saturation, the geomechanical model includes Young's modulus, Poisson's ratio, three-dimensional principal stress, stress direction and pore pressure, the natural fracture model includes fracture distribution, fracture size and fracture orientation, and the parent well network model includes parent well trajectory and fracture network simulation results.

[0014] Preferably, step S2 further includes the steps of acquiring historical production data of the implemented well network, fitting the simulated production process using the historical production data, and adjusting the infill well fracturing parameter design model according to the fitting result.

[0015] Preferably, in step S4, the pressure drop threshold is used as the boundary to identify the boundaries of the two old wells closest to the infill well. The area between the two boundaries is the unmoved area, and the area of ​​the usable area of ​​the infill well is obtained based on the unmoved area.

[0016] Preferably, in step S5, the criteria for classifying the fracturing stages of the infill wells are as follows:

[0017] The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distances from the boundaries of the usable area on both sides are greater than or equal to 0.9 times the well spacing are regarded as Class I fracturing sections;

[0018] The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the mobilizable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class II fracturing sections;

[0019] The fracturing sections whose total length on both sides of the horizontal fracturing section is less than 0.5 times the well spacing of the parent well and whose distance difference from the boundary of the usable area on both sides is greater than or equal to 0.1 times the well spacing are regarded as Class III fracturing sections.

[0020] Preferably, in step S5, when designing differentiated fracturing construction parameters for each graded fracturing stage,

[0021] For Class I fracturing stages, differentiated fracturing construction parameter design is performed with the goal of maximizing the stimulation volume;

[0022] For Class II fracturing stages, temporary plugging is used to improve the transformation effect;

[0023] For Class III fracturing sections, differentiated fracturing construction parameter design is carried out mainly to prevent channeling.

[0024] In a second aspect, a system for designing an infill well fracturing based on an available area is also provided, comprising:

[0025] The infill well fracturing parameter design model building module is used to establish the infill well fracturing parameter design model of the target block;

[0026] A production process simulation module, used to simulate the production process of the implemented well pattern based on the infill well fracturing parameter design model, and obtain the pressure field before the infill well fracturing;

[0027] A four-dimensional stress dynamic calculation module is used to carry out four-dimensional stress dynamic calculation in the process of oil and gas reservoir exploitation according to the pressure field, obtain stress evolution results, and update relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results;

[0028] A module for calculating the area of ​​the infill well available for use, used to identify the area of ​​the infill well available for use in the updated infill well fracturing parameter design model;

[0029] The infill well fracturing construction parameter design module is used to classify the fracturing sections of the infill wells according to the mobilizable area of ​​the infill wells, and to design differentiated fracturing construction parameters for each graded fracturing section.

[0030] In a third aspect, an electronic device is also provided, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute any one of the above-mentioned methods for designing infill well fracturing based on an available area.

[0031] In a fourth aspect, a computer-readable storage medium is also provided, which stores a computer program, and when the computer program is executed by a processor, it implements any one of the above-mentioned methods for designing infill well fracturing based on an available area.

[0032] The beneficial effects of the present invention are:

[0033] The present invention can simulate and analyze the uneven transformation and utilization areas of shale gas wells that have been implemented, and carry out optimized design of infill well fracturing based on the remaining usable areas, thereby improving the fracturing effect of the infill wells while avoiding pressure channeling, thereby increasing the overall production capacity of the infill well group. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 is a pressure-horizontal stress difference cross-section diagram of a parent well in a vertical wellbore direction in a specific embodiment;

[0036] Figure 2 It is a comparison and verification diagram of the simulated fracture network and the monitoring results of the holographic electromagnetic method in a specific embodiment;

[0037] Figure 3 A pressure field diagram of an infill well before fracturing in a specific embodiment;

[0038] Figure 4 is an updated maximum horizontal principal stress distribution diagram in a specific embodiment;

[0039] Figure 5 A schematic diagram of a region that has been used in a specific embodiment;

[0040] Figure 6 It is a schematic diagram of the boundaries of the movable areas on both sides drawn according to the pressure drop in a specific embodiment;

[0041] Figure 7 This is a diagram of the pressure field at the end of production of a well group before and after optimization in a specific embodiment; the left side is before optimization, and the right side is after optimization;

[0042] Figure 8 is a comparison diagram of the cumulative gas production of a well group before and after optimization in a specific embodiment; Figure 8 (a) is a comparison chart of the cumulative gas production of each well. Figure 8 (b) is a comparison chart of the cumulative gas production of the well groups. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. The words "including" or "comprising" and the like used in the disclosure of the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0044] In a first aspect, the present invention provides a method for designing an infill well fracturing based on an available area, comprising the following steps:

[0045] S1: Establish a fracturing parameter design model for infill wells in the target block.

[0046] In a specific embodiment, the infill well fracturing parameter design model includes a reservoir property model, a geomechanical model, a natural fracture model and a parent well pattern model. Optionally, the reservoir property model includes porosity, permeability and saturation, the geomechanical model includes Young's modulus, Poisson's ratio, three-dimensional principal stress, stress direction and pore pressure, the natural fracture model includes fracture distribution, fracture size and fracture orientation, and the parent well pattern model includes the parent well trajectory and the fracturing pattern simulation results.

[0047] The infill well fracturing parameter design model established in the above embodiment can take into account the impact of long-term exploitation of natural fractured reservoirs on infill well volume fracturing, and accurately describe the real state of the shale reservoir before infill well fracturing.

[0048] In a specific embodiment, when establishing the infill well fracturing parameter design model, a three-dimensional geological and geomechanical model is first established based on the reservoir physical properties and geomechanical parameters, and then natural fracture data is imported into the three-dimensional geological and geomechanical model, and the holographic electromagnetic monitoring results are used as constraints to simulate the parent well fracturing network.

[0049] S2: Based on the infill well fracturing parameter design model, the production process of the implemented well network is simulated to obtain the pressure field before the infill well fracturing.

[0050] In a specific embodiment, this step also includes the steps of obtaining historical production data of the implemented well network, fitting the simulated production process using the historical production data, and adjusting the infill well fracturing parameter design model according to the fitting results.

[0051] S3: Performing four-dimensional stress dynamic calculations during oil and gas reservoir exploitation according to the pressure field to obtain stress evolution results, and updating relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results.

[0052] It should be noted that the four-dimensional stress dynamic calculation uses a single medium seepage model and a finite element model to perform fluid-solid coupling to obtain the stress tensor and pore pressure distribution at each time step. This is an existing technology and the specific calculation method will not be repeated here.

[0053] In the present invention, the volume fracturing analysis of infill wells carried out based on four-dimensional dynamic geostress results can solve the problem of unclear understanding of complex fracture morphology in infill well fracturing.

[0054] S4: Identify the mobilizable area of ​​the infill wells in the updated infill well fracturing parameter design model.

[0055] In a specific embodiment, the pressure drop threshold is used as the boundary to identify the boundaries of the two old wells closest to the infill well. The area between the two boundaries is the unmoved area, and the area of ​​the usable area of ​​the infill well is obtained based on the unmoved area. It should be noted that the pressure drop threshold is determined by the pressure drop profile.

[0056] In a specific embodiment, the pressure-horizontal stress difference profile in the vertical wellbore direction of a parent well in a well group of a shale gas reservoir is as follows: Figure 1 As shown. Figure 1 It can be seen that the pressure drop is clearly divided into zones, with the largest pressure drop in the parent well fracture control area, the matrix unused area and the intermediate transition area. The pressure gradient in the intermediate transition area is extremely large and the stress changes dramatically. The horizontal stress direction is reversed. The crack expansion in this area is complex and uncontrollable (high risk of pressure channeling, etc.), so it is not identified as an unused area. Further, according to the pressure drop profile, it is determined that the pressure drop threshold described in this embodiment is 10%, that is, the area with a pressure drop amplitude of less than 10% is an unused area.

[0057] S5: Classifying the fracturing sections of the infill wells according to the available area of ​​the infill wells, and designing differentiated fracturing construction parameters for the classified fracturing sections.

[0058] In a specific embodiment, the criteria for fracturing stage classification of infill wells are as follows:

[0059] The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distances from the boundaries of the usable area on both sides are greater than or equal to 0.9 times the well spacing are regarded as Class I fracturing sections;

[0060] The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the mobilizable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class II fracturing sections;

[0061] The fracturing sections whose total length on both sides of the horizontal fracturing section is less than 0.5 times the well spacing of the parent well and whose distance difference from the boundary of the usable area on both sides is greater than or equal to 0.1 times the well spacing are regarded as Class III fracturing sections.

[0062] In a specific embodiment, when designing differentiated fracturing construction parameters for each graded fracturing stage,

[0063] For Class I fracturing stages, differentiated fracturing construction parameter design is performed with the goal of maximizing the stimulation volume;

[0064] For Class II fracturing stages, temporary plugging is used to improve the transformation effect;

[0065] For Class III fracturing sections, differentiated fracturing construction parameter design is carried out mainly to prevent channeling.

[0066] In a second aspect, the present invention further provides a system for designing an infill well fracturing based on an available area, comprising:

[0067] The infill well fracturing parameter design model building module is used to establish the infill well fracturing parameter design model of the target block;

[0068] A production process simulation module, used to simulate the production process of the implemented well pattern based on the infill well fracturing parameter design model, and obtain the pressure field before the infill well fracturing;

[0069] A four-dimensional stress dynamic calculation module is used to carry out four-dimensional stress dynamic calculation in the process of oil and gas reservoir exploitation according to the pressure field, obtain stress evolution results, and update relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results;

[0070] A module for calculating the area of ​​the infill well available for use, used to identify the area of ​​the infill well available for use in the updated infill well fracturing parameter design model;

[0071] The infill well fracturing construction parameter design module is used to classify the fracturing sections of the infill wells according to the mobilizable area of ​​the infill wells, and to design differentiated fracturing construction parameters for each graded fracturing section.

[0072] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute any one of the above-mentioned methods for designing infill well fracturing based on an available area.

[0073] In a fourth aspect, the present invention further provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements any one of the above-mentioned methods for designing infill well fracturing based on an available area.

[0074] In a specific embodiment, taking a certain medium-deep shale gas reservoir platform as an example, the infill well fracturing design method based on the movable area of ​​the present invention is used to carry out infill well fracturing design, which specifically includes the following steps:

[0075] (1) Establish a fracturing parameter design model for infill wells in the target area;

[0076] In this embodiment, a three-dimensional geological model of the well group area of ​​the platform H15 well group including physical properties and geomechanical parameters is established, and a well network of implemented parent well fracturing is constructed on the three-dimensional geological model of the well group area to obtain a design model of fracturing parameters for infilled wells. Specifically: a three-dimensional geological and geomechanical model is established based on the porosity, permeability, saturation, Young's modulus, Poisson's ratio, three-dimensional principal stress, stress direction and pore pressure of a single well in the H well group; a natural fracture model is established based on the distribution, size and orientation of the fractures, and a parent well fracturing well network model is established based on the parent well trajectory and the simulation results of the fracturing network; the simulation of the parent well fracturing network takes into account the prediction of natural fractures and the influence of fault zones, and is compared and fitted with the monitoring results of the holographic electromagnetic method. The fitting results are as follows: Figure 2 shown.

[0077] (2) Simulate the production process of the implemented well pattern and obtain the pressure field before fracturing of the infill wells;

[0078] In this embodiment, based on the H platform infill well fracturing parameter design model established in step (1), the production dynamic data of the implemented well network (including three mother wells H-1, H-2, and H-3) are fitted to simulate the pressure field before infill fracturing. The results are as follows: Figure 3 shown.

[0079] (3) Carry out four-dimensional stress dynamic calculation during oil and gas reservoir exploitation to obtain stress evolution results, and update relevant geological parameters in the infill well fracturing parameter design model, where the updated maximum horizontal principal stress distribution is as follows: Figure 4 As shown;

[0080] (4) Identify the usable area of ​​the infill wells in the updated infill well fracturing parameter design model;

[0081] In this embodiment, the produced area of ​​the infill well group is identified and mapped with a pressure drop of 10% as the boundary. The results are as follows: Figure 5 As shown in the figure, the available area size on the left and right sides of the infill well is as follows: Figure 6 shown.

[0082] (5) Classifying the fracturing sections of the infill wells according to the available areas of the infill wells, and designing differentiated fracturing construction parameters for the classified fracturing sections.

[0083] In this example, taking the H platform as an example, the distance between H-1 well and H-2 well is 400 m, the infill well HJ is located between the two wells, and the H3 well is located on the right side of the H2 well. Keeping the total construction scale of the infill well unchanged, the fracturing stage is staggered with the parent well, and the segmentation results are as follows:

[0084] For Class I fracturing sections, the total length of the horizontal fracturing section that can be used on both sides is greater than 0.5 times the well spacing of the parent well (i.e., 200 m), and the distance between both sides and the boundary of the usable area is greater than 0.9 times the well spacing (90 m);

[0085] For the Class II fracturing section, the total length of the mobilizable section on both sides is greater than 0.5 times the well spacing of the parent well, but the difference in distance between the two sides and the boundary of the mobilizable area is greater than 0.1 times the well spacing (20 m);

[0086] For the Class III fracturing section, the total length of the mobilizable section on both sides is less than 0.5 times the well spacing of the parent well, and the difference in distance between the two sides and the boundary of the mobilizable area is greater than 0.1 times the well spacing (20 m).

[0087] Differentiated optimization designs are carried out for different types of fracturing stages: The movable areas on both sides of the Type I fracturing stage are large, with the goal of maximizing the stimulation volume. Eight clusters of perforations are used, and the fluid intensity is 27-30m 3 / m; The movable areas on both sides of the Class II fracturing stage are quite different, and there is a certain risk of pressure channeling. 10 clusters of perforations are used, and the fluid intensity is 22-25m 3 / m, combined with temporary plugging to improve the transformation effect; the transformation area of ​​Class III fracturing section is limited, and the risk of channeling is high, so temporary plugging is required to prevent channeling. 11 cluster perforations are used, and the liquid intensity is not more than 21m 3 / m, and make differential adjustments according to the size of the available area. The pressure distribution of the well group at the end of production after HJ fracturing of the infill wells before and after optimization is as follows: Figure 7 As shown in Figure 2, the cumulative gas production of each well in the well group is compared. Figure 8 As shown. Figure 8 It can be seen that compared with the original plan, the optimized plan not only increases the HJ gas production of the infill well, but also restores the production capacity of the parent well, thereby improving the overall gas production of the well group.

[0088] In summary, the present invention can identify the mobilizable area of ​​the infill wells and carry out a more sophisticated differentiated fracturing design for the infill wells, thereby improving the fracturing effect of the infill wells while avoiding fracturing channeling, thereby increasing the overall production capacity of the infill well group. Compared with the prior art, the present invention is a significant improvement.

[0089] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for designing infill well fracturing based on an available area, characterized in that: The following steps are involved: S1: Establish a fracturing parameter design model for infill wells in the target block; S2: simulating the production process of the implemented well pattern based on the infill well fracturing parameter design model to obtain the pressure field before the infill well fracturing; S3: performing a four-dimensional stress dynamic calculation in the oil and gas reservoir exploitation process according to the pressure field, obtaining stress evolution results, and updating relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results; S4: Identify the area of ​​the infill wells that can be mobilized in the updated infill well fracturing parameter design model; S5: Classifying the fracturing sections of the infill wells according to the available area of ​​the infill wells, and designing differentiated fracturing construction parameters for the classified fracturing sections; The standards for fracturing stage classification for infill wells are as follows: The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distances from the boundaries of the usable area on both sides are greater than or equal to 0.9 times the well spacing are regarded as Class I fracturing sections; The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the mobilizable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class II fracturing sections; The fracturing sections whose total length on both sides of the horizontal fracturing section is less than 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the usable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class III fracturing sections; When designing differentiated fracturing construction parameters for each level of fracturing, For Class I fracturing stages, differentiated fracturing construction parameter design is performed with the goal of maximizing the stimulation volume; For Class II fracturing stages, temporary plugging is used to improve the transformation effect; For Class III fracturing sections, differentiated fracturing construction parameter design is carried out mainly to prevent channeling.

2. The method for designing infill well fracturing based on the movable area according to claim 1, characterized in that: In step S1, the infill well fracturing parameter design model includes a reservoir property model, a geomechanical model, a natural fracture model and a parent well pattern model.

3. The method for designing infill well fracturing based on the movable area according to claim 2, characterized in that: The reservoir physical property model includes porosity, permeability and saturation, the geomechanical model includes Young's modulus, Poisson's ratio, three-dimensional principal stress, stress direction and pore pressure, the natural fracture model includes fracture distribution, fracture size and fracture orientation, and the parent well network model includes parent well trajectory and fracture network simulation results.

4. The method for designing infill well fracturing based on the movable area according to claim 1, characterized in that: Step S2 also includes the steps of acquiring historical production data of the implemented well network, fitting the simulated production process using the historical production data, and adjusting the infill well fracturing parameter design model according to the fitting results.

5. The method for designing infill well fracturing based on the movable area according to claim 1, characterized in that: In step S4, the pressure drop threshold is used as the boundary to identify the boundaries of the two old wells closest to the infill well. The area between the two boundaries is the unmoved area, and the area of ​​the usable area of ​​the infill well is obtained based on the unmoved area.

6. A fracturing design system for infill wells based on available areas, characterized in that: include: The infill well fracturing parameter design model building module is used to establish the infill well fracturing parameter design model of the target block; A production process simulation module, used to simulate the production process of the implemented well pattern based on the infill well fracturing parameter design model, and obtain the pressure field before the infill well fracturing; A four-dimensional stress dynamic calculation module is used to carry out four-dimensional stress dynamic calculation in the process of oil and gas reservoir exploitation according to the pressure field, obtain stress evolution results, and update relevant geological parameters in the infill well fracturing parameter design model according to the stress evolution results; A module for calculating the area of ​​the infill well available for use, used to identify the area of ​​the infill well available for use in the updated infill well fracturing parameter design model; A module for designing fracturing construction parameters for infill wells, which classifies the fracturing sections of infill wells according to the available area of ​​the infill wells, and designs differentiated fracturing construction parameters for each level of fracturing sections after classification; The standards for fracturing stage classification for infill wells are as follows: The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distances from the boundaries of the usable area on both sides are greater than or equal to 0.9 times the well spacing are regarded as Class I fracturing sections; The fracturing sections whose total length on both sides of the horizontal fracturing section is greater than or equal to 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the mobilizable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class II fracturing sections; The fracturing sections whose total length on both sides of the horizontal fracturing section is less than 0.5 times the well spacing of the parent well, and whose distance difference from the boundary of the mobilizable area on both sides is greater than or equal to 0.1 times the well spacing, are regarded as Class III fracturing sections; When designing differentiated fracturing construction parameters for each level of fracturing, For Class I fracturing stages, differentiated fracturing construction parameter design is performed with the goal of maximizing the stimulation volume; For Class II fracturing stages, temporary plugging is used to improve the transformation effect; For Class III fracturing sections, differentiated fracturing construction parameter design is carried out mainly to prevent channeling.

7. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute a method for designing infill well fracturing based on an available area as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: It stores a computer program, which, when executed by a processor, implements a method for designing infill well fracturing based on an available area as described in any one of claims 1 to 5.

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