Repeating fracturing design method, device, storage medium and electronic equipment

Abstract

The application relates to the technical field of oil and gas field development, in particular to a repeated fracturing design method and device, a storage medium and an electronic equipment. The method comprises the following steps: obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data, wherein the natural fracture model can accurately represent the fracture morphology of the target reservoir; a three-dimensional heterogeneous geomechanics model of the target reservoir is established according to the natural fracture model, the rock mechanics parameters and the geological model, the three-dimensional heterogeneous geomechanics model has mechanical properties, so that primary fracturing simulation can be carried out, and a primary fracturing simulation result can be accurately obtained. The primary fracturing reservoir numerical simulation result is corrected according to the primary fracturing simulation result and the full well section production data, so that a present reservoir geostress field is obtained; and repeated fracturing design is carried out according to the present reservoir geostress field, so that the reliability of the repeated fracturing is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas field development, in particular to a repeated fracturing design method and device, a storage medium and an electronic equipment. BACKGROUND

[0002] Horizontal well staged fracturing has become a key technology for unconventional oil and gas field exploration and development, which can make the reservoir be used to a large extent in the early development stage. However, with the development of exploitation, the production after the initial fracturing decreases rapidly, showing the characteristics of low cumulative production of single well and low recovery degree. The remaining resources still need to be further tapped, and the application of repeated fracturing technology can effectively solve this problem. Therefore, this technology has become one of the key technologies in the oil and gas development industry in recent years.

[0003] Compared with the initial fracturing design, the repeated fracturing design not only involves the fracture morphology description of the initial fracturing, but also considers the production process of the initial fracturing. The whole design is more complex and difficult. At present, the repeated fracturing technology of horizontal well in China is not mature and is less applied. In the repeated fracturing design, the influence of the reservoir heterogeneity characteristics and the distribution of fault natural fractures cannot be considered, especially when the horizontal well is multi-stage fractured. Due to the influence of the initial fracturing, the heterogeneity of the reservoir in the plane and the vertical direction is more obvious. When the repeated fracturing design is carried out, the reservoir characteristics at different segment clusters are not considered, and differential design is not carried out accordingly, resulting in the problem of unreasonable repeated fracturing design. In addition, the existing repeated fracturing design does not consider the change of the reservoir stress field in the production process, and cannot effectively simulate the fracture propagation morphology of the repeated fracturing of the old fracture and the new fracture formed by the supplement hole, which is difficult to meet the design requirements of the repeated fracturing, and affects the reliability of the fracturing design. SUMMARY

[0004] In view of the above problems, the present application provides a repeated fracturing design method, device, storage medium and electronic equipment.

[0005] In the first aspect, the present application provides a repeated fracturing design method, which comprises:

[0006] obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0007] establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0008] carrying out initial fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial fracturing simulation result;

[0009] The initial fracturing simulation result and the whole well section production data are used to correct the initial fracturing reservoir numerical simulation result, so as to obtain a current reservoir geostress field; wherein, the initial fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model and the initial fracturing simulation result;

[0010] According to the current reservoir geostress field, a refracturing design is performed.

[0011] In the implementation process, the natural fracture modeling is first performed according to the seismic logging data of the target reservoir to obtain a natural fracture model, so as to ensure that the natural fracture model can accurately represent the fracture morphology of the target reservoir. Then, the rock mechanics parameters are obtained according to the seismic logging data of the target reservoir. Then, a three-dimensional heterogeneous geomechanical model is established according to the natural fracture model, the rock mechanics parameters and the geological model. The three-dimensional heterogeneous geomechanical model has mechanical properties. Therefore, after the initial fracturing simulation of the three-dimensional heterogeneous geomechanical model is performed, the initial fracturing simulation result can be accurately obtained. The initial fracturing reservoir numerical simulation result is accurately corrected based on the initial fracturing simulation result and the whole well section production data. Then, the refracturing design is performed according to the current reservoir geostress field, so as to ensure the reliability of the refracturing.

[0012] According to the embodiments of the present application, in the refracturing design method, the natural fracture model of the target reservoir is obtained according to the seismic logging data, which includes:

[0013] The fault occurrence parameters in the seismic logging data are obtained.

[0014] The natural fracture model of the target reservoir is established according to the fault occurrence parameters.

[0015] In the implementation process, since the natural fracture is often accompanied by fault development, the natural fracture model of the target reservoir can be established according to the fault occurrence parameters.

[0016] According to the embodiments of the present application, in the refracturing design method, the three-dimensional heterogeneous geomechanical model of the target reservoir is established according to the natural fracture model, the rock mechanics parameters and the geological model, which includes:

[0017] The relationship characteristics between the reservoir porosity of the target reservoir along the well trajectory direction and the rock mechanics parameters are obtained.

[0018] The three-dimensional rock mechanics attribute field of the target reservoir is constructed according to the relationship characteristics, the rock mechanics parameters and the geological model.

[0019] The geostress field of the target reservoir is calculated according to the natural fracture model and the three-dimensional rock mechanics attribute field.

[0020] The three-dimensional heterogeneous geomechanics model is established according to the three-dimensional rock mechanics attribute field and the in-situ stress field.

[0021] In the implementation process, the target reservoir is a three-dimensional data body, and the logging data is one-dimensional data along the well trajectory direction, so that the three-dimensional geomechanics field of the reservoir cannot be directly established. Therefore, the relationship characteristics of the reservoir porosity and the rock mechanics parameters along the well trajectory direction are obtained, the mechanical properties are given to the entire geologic model of the target reservoir according to the relationship characteristics, and the three-directional in-situ stress field of the target reservoir is calculated, so that the three-dimensional heterogeneous geomechanics model of the target reservoir can be established.

[0022] According to an embodiment of the present application, in the repeated fracturing design method, the rock mechanics parameters of the target reservoir are obtained according to the seismic logging data, including:

[0023] The dynamic rock mechanics parameters are calculated according to the seismic logging data.

[0024] The dynamic-static parameter conversion relationship is obtained, and the dynamic rock mechanics parameters are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0025] In the implementation process, the rock mechanics parameters obtained according to the seismic logging data are all dynamic mechanics parameters, and the mechanics parameters required for the in-situ stress field calculation and the fracture propagation calculation are all static rock mechanics parameters. Therefore, the dynamic-static parameter conversion relationship is obtained, and the dynamic rock mechanics parameters obtained according to the seismic logging data of the entire target reservoir are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0026] According to an embodiment of the present application, in the repeated fracturing design method, the three-dimensional heterogeneous geomechanics model is subjected to initial fracturing simulation to obtain initial fracturing simulation results, including:

[0027] The three-dimensional heterogeneous geomechanics model is subjected to finite element numerical simulation to obtain initial initial fracturing simulation results.

[0028] The fracturing results of the target reservoir after initial fracturing are obtained.

[0029] The initial initial fracturing simulation results are corrected according to the fracturing results to obtain initial fracturing simulation results.

[0030] In the implementation process, after the three-dimensional heterogeneous geomechanical model corresponding to the target reservoir is established, the finite element numerical simulation method can be used to obtain the initial primary fracturing simulation result. There is a difference between the initial primary fracturing simulation result and the actual primary fracturing result of the target reservoir. Therefore, the fracturing result after the primary fracturing of the target reservoir can be obtained, and the initial primary fracturing simulation result of the target reservoir is corrected according to the fracturing result after the primary fracturing of the target reservoir, so as to modify the local physical property and fracture parameter in the initial primary fracturing simulation result of the target reservoir, and ensure the accuracy of the obtained primary fracturing simulation result.

[0031] According to the embodiments of the present application, in the repeated fracturing design method, the primary fracturing simulation result and the full-well-section production data are used to correct the primary fracturing reservoir numerical simulation result to obtain the current reservoir geostress field, including:

[0032] The reservoir numerical simulation is carried out according to the primary fracturing simulation result to obtain a calculated production;

[0033] The calculated production is compared with the full-well-section production data to obtain the comparison result;

[0034] The reservoir numerical simulation model is modified according to the comparison result to obtain a modified reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geologic model, the natural fracture model and the primary fracturing simulation result;

[0035] The current formation pressure field of the reservoir is obtained by production history matching according to the modified reservoir numerical simulation model;

[0036] The geostress field of the target reservoir is obtained, and the current reservoir geostress field is obtained according to the geostress field and the current formation pressure field of the target reservoir.

[0037] In the implementation process, on the basis of the primary fracturing simulation result, the reservoir numerical simulation is carried out to calculate the production so far, and then the production history matching is carried out in combination with the full-well-section production data to modify the reservoir model, solve the pore pressure change around the fracture, and calculate the current reservoir geostress field based on the poroelasticity mechanics.

[0038] According to the embodiments of the present application, in the repeated fracturing design method, the current reservoir geostress field is used to carry out repeated fracturing design, including:

[0039] The repeated fracturing perforation cluster parameters are obtained according to the current reservoir geostress field;

[0040] The repeated fracturing crack propagation numerical simulation is carried out according to the repeated fracturing perforation cluster parameters to obtain a repeated fracturing simulation result.

[0041] Refracturing design is performed according to the refracturing simulation results.

[0042] During the above implementation process, the parameters of the refracturing perforation section cluster are obtained based on the current geostress field, and numerical simulation of refracturing crack propagation is carried out based on a three-dimensional heterogeneous geomechanical model to obtain refracturing simulation results. In this way, the fracturing construction process and parameters can be optimized based on the refracturing simulation results, forming a refracturing design that integrates geology and engineering.

[0043] In a second aspect, the present application provides a repeated fracturing design device, the device comprising:

[0044] A data processing module is used to obtain a geological model and seismic logging data of a target reservoir, and to obtain a natural fracture model and rock mechanics parameters of the target reservoir based on the seismic logging data;

[0045] a three-dimensional heterogeneous geomechanical model building module, configured to build a three-dimensional heterogeneous geomechanical model of the target reservoir based on the natural fracture model, the rock mechanics parameters, and the geological model;

[0046] A primary fracturing simulation module, configured to perform a primary fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain a primary fracturing simulation result;

[0047] a current reservoir stress field acquisition module, configured to correct the initial fracturing reservoir numerical simulation results based on the initial fracturing simulation results and the full-well production data to obtain the current reservoir in-situ stress field; wherein the initial fracturing reservoir numerical simulation results are obtained based on the geological model, the natural fracture model, and the initial fracturing simulation results;

[0048] The re-fracturing module is used to carry out re-fracturing design according to the current reservoir in-situ stress field.

[0049] According to an embodiment of the present application, optionally, in the above-mentioned refracturing design device, the data processing module includes:

[0050] a fault occurrence parameter acquisition unit, configured to acquire the fault occurrence parameters from the seismic logging data;

[0051] The natural fracture model establishing unit is used to establish a natural fracture model of the target reservoir according to the fault occurrence parameters.

[0052] According to an embodiment of the present application, optionally, in the above-mentioned refracturing design device, the three-dimensional heterogeneous geomechanical model establishment module includes:

[0053] The relationship characteristic acquisition unit is configured to acquire a relationship characteristic of reservoir porosity of the target reservoir along a well trajectory direction and the rock mechanics parameter;

[0054] The three-dimensional rock mechanics attribute field construction unit is configured to construct a three-dimensional rock mechanics attribute field of the target reservoir according to the relationship characteristic, the rock mechanics parameter, and the geological model;

[0055] The geostress field calculation unit of the target reservoir is configured to calculate a geostress field of the target reservoir according to the natural fracture model and the three-dimensional rock mechanics attribute field;

[0056] The three-dimensional heterogeneous geomechanics model establishment unit is configured to establish the three-dimensional heterogeneous geomechanics model according to the three-dimensional rock mechanics attribute field and the geostress field.

[0057] According to the embodiments of the present application, optionally, in the repeated fracturing design device, the data processing module comprises:

[0058] The dynamic rock mechanics parameter calculation unit is configured to calculate a dynamic rock mechanics parameter according to the seismic logging data;

[0059] The static rock mechanics parameter acquisition unit is configured to acquire a dynamic-static parameter conversion relationship, and convert the dynamic rock mechanics parameter into a static rock mechanics parameter according to the dynamic-static parameter conversion relationship.

[0060] According to the embodiments of the present application, optionally, in the repeated fracturing design device, the static rock mechanics parameter acquisition unit comprises:

[0061] The indoor rock mechanics experiment data acquisition subunit is configured to acquire a static rock mechanics parameter according to an indoor rock mechanics experiment test;

[0062] The dynamic-static parameter conversion relationship determination subunit is configured to determine the dynamic-static parameter conversion relationship according to the static rock mechanics parameter.

[0063] According to the embodiments of the present application, optionally, in the repeated fracturing design device, the initial fracturing simulation module comprises:

[0064] The initial simulation unit is configured to perform finite element numerical simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial initial fracturing simulation result;

[0065] The initial fracturing result acquisition unit is configured to acquire a fracturing result of the target reservoir after initial fracturing;

[0066] The initial fracturing simulation result acquisition unit is configured to correct the initial initial fracturing simulation result according to the fracturing result to obtain an initial fracturing simulation result.

[0067] According to the embodiments of the present application, optionally, in the repeated fracturing design device, the present reservoir stress field obtaining module comprises:

[0068] The reservoir numerical simulation unit is configured to perform reservoir numerical simulation according to the primary fracturing simulation result to obtain a calculated production;

[0069] The comparison unit is configured to compare the calculated production with the full well section production data to obtain the comparison result;

[0070] The correction unit is configured to correct the reservoir numerical simulation model according to the comparison result to obtain a corrected reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geological model, the natural fracture model and the primary fracturing simulation result;

[0071] The production history matching unit is configured to perform production history matching according to the corrected reservoir numerical simulation model to obtain the present reservoir formation pressure field;

[0072] The present reservoir stress field obtaining unit is configured to obtain the in-situ stress field of a target reservoir, and obtain the present reservoir stress field according to the in-situ stress field of the target reservoir and the present formation pressure field.

[0073] According to the embodiments of the present application, optionally, in the repeated fracturing design device, the repeated fracturing module comprises:

[0074] The repeated fracturing perforation cluster parameter obtaining unit is configured to obtain the repeated fracturing perforation cluster parameter according to the present reservoir stress field;

[0075] The repeated fracturing simulation result obtaining unit is configured to perform repeated fracturing fracture propagation numerical simulation according to the repeated fracturing perforation cluster parameter to obtain a repeated fracturing simulation result;

[0076] The repeated fracturing simulation unit is configured to perform repeated fracturing design according to the repeated fracturing simulation result.

[0077] In a third aspect, the present application provides a storage medium, which stores a computer program executable by one or more processors and can be used to implement the repeated fracturing design method as described above.

[0078] In a fourth aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to perform the repeated fracturing design method as described above.

[0079] Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

[0080] The present application provides a repeated fracturing design method, device, storage medium and electronic device, the method comprising: obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanical parameters of the target reservoir based on the seismic logging data; establishing a three-dimensional heterogeneous geomechanical model of the target reservoir based on the natural fracture model, the rock mechanical parameters and the geological model; performing an initial fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain an initial fracturing simulation result; correcting the initial fracturing reservoir numerical simulation result based on the initial fracturing simulation result and the full-well production data to obtain a current reservoir in-situ stress field; and performing repeated fracturing design based on the current reservoir in-situ stress field. First, natural fractures are modeled based on the seismic logging data of the target reservoir to obtain a natural fracture model to ensure that the natural fracture model can accurately represent the fracture morphology of the target reservoir. At the same time, rock mechanical parameters are obtained based on the seismic logging data of the target reservoir. Then, a three-dimensional heterogeneous geomechanical model is established based on the natural fracture model, rock mechanical parameters and geological model. The three-dimensional heterogeneous geomechanical model has mechanical properties, so after the initial fracturing simulation is performed on the three-dimensional heterogeneous geomechanical model, the initial fracturing simulation results can be accurately obtained. It is ensured that the initial fracturing reservoir numerical simulation results are accurately corrected based on the initial fracturing simulation results and the full-well production data, and then repeated fracturing design is performed according to the current reservoir stress field to ensure the reliability of repeated fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Hereinafter, the present application will be described in more detail based on embodiments with reference to the accompanying drawings.

[0082] Figure 1 A schematic flow chart of a repeated fracturing design method provided in Example 1 of the present application.

[0083] Figure 2 Another flow chart of a repeated fracturing design method provided in Example 6 of the present application.

[0084] Figure 3 For the embodiment of this application Seven A schematic diagram of a three-dimensional geological model of a target reservoir is provided.

[0085] Figure 4 For the embodiment of this application Seven The results of the initial fracturing simulation of a target reservoir and a schematic diagram of the current ground stress are provided.

[0086] Figure 5 For the embodiment of this application Seven A schematic diagram of repeated fracturing simulation results is provided.

[0087] Figure 6 For the embodiment of this application Seven A schematic diagram of the plane distribution of fractures in a primary fracturing simulation is provided.

[0088] Figure 7 For the embodiment of this application Seven A schematic diagram of fracture height distribution in a primary fracturing simulation is provided.

[0089] Figure 8 For the embodiment of this application Seven A schematic diagram of the current formation pressure calculation results is provided.

[0090] Figure 9 For the embodiment of this application Seven A schematic diagram of the results of a refracturing simulation is provided.

[0091] Figure 10 A structural schematic diagram of a repeated fracturing design device provided in Example 8 of the present application.

[0092] Figure 11 This is a connection block diagram of an electronic device provided in Example 10 of the present application.

[0093] In the drawings, like components are given like reference numerals, and the drawings are not drawn to scale. DETAILED DESCRIPTION

[0094] The following will describe the implementation methods of this application in detail with reference to the accompanying drawings and examples, so that the application can fully understand how technical means are used to solve technical problems and achieve corresponding technical effects, and implement them accordingly. The embodiments of this application and the various features therein can be combined with each other without conflict, and the resulting technical solutions are all within the scope of protection of this application.

[0095] Example One

[0096] See also Figure 1 , Figure 1 This is a flow chart of a repeated fracturing design method provided in Example 1 of the present application. The present application provides a repeated fracturing design method that can be applied to electronic devices such as computers or special equipment. When the repeated fracturing design method is applied to the electronic device, the following steps are performed.

[0097] Step S110: Acquire a geological model and seismic logging data of a target reservoir, and acquire a natural fracture model and rock mechanics parameters of the target reservoir based on the seismic logging data.

[0098] In the process of obtaining the natural fracture model of the target reservoir according to the seismic logging data, the attitude parameters of the faults in the seismic logging data can be obtained first; and then the natural fracture model of the target reservoir is established according to the attitude parameters of the faults.

[0099] The geological model includes basic physical parameters such as reservoir porosity, permeability, and oil and gas saturation, and further includes a fault model. For the natural fractures around the faults which often develop similar attitudes, the natural fracture modeling of the target reservoir can be performed according to the fault interpretation results in the seismic logging data, and the natural fracture model of the target reservoir is obtained, which can accurately represent the three-dimensional geological characteristics of the target reservoir. In addition, the rock mechanics parameters corresponding to the target reservoir can be calculated based on the logging data in the seismic logging data.

[0100] Step S120: establishing a three-dimensional heterogeneous geomechanical model of the target reservoir according to the natural fracture model, the rock mechanics parameters, and the geological model.

[0101] The logging data in the seismic logging data includes data such as shale content, acoustic wave, density, and porosity, and the rock mechanics dynamic parameters such as Young's modulus and Poisson's ratio of the target reservoir can be calculated according to the logging data. According to the rock mechanics parameters calculated above, a model with mechanical properties is established, that is, a three-dimensional heterogeneous mechanical model corresponding to the target reservoir.

[0102] Step S130: performing primary fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain a primary fracturing simulation result.

[0103] The finite element numerical simulation method is used to perform primary fracturing simulation on the three-dimensional heterogeneous geomechanical model. Mainly based on the field construction pump injection program, the numerical simulation of the fracture propagation of the horizontal well multi-section multi-cluster primary fracturing is carried out, and the initial primary fracturing simulation result obtained by performing primary fracturing simulation on the three-dimensional heterogeneous geomechanical model is corrected in combination with the fracturing result of the actual primary fracturing of the target reservoir, such as the field microseismic monitoring result of the target reservoir during the primary fracturing, so as to ensure that the accurate primary fracturing simulation result can be obtained.

[0104] Step S140: correcting the primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and the full-well-section production data to obtain a present reservoir geostress field.

[0105] The primary fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model, and the primary fracturing simulation result.

[0106] After obtaining the initial fracturing simulation result, the numerical simulation of the oil reservoir is carried out on the three-dimensional geological model, the production history fitting from the initial fracturing to the present is carried out based on the full well section production data, and then the oil reservoir mathematical model is corrected to obtain the present reservoir geostress field.

[0107] Step S150: According to the present reservoir geostress field, repeated fracturing design is carried out.

[0108] After obtaining the present reservoir geostress field, the repeated fracturing section can be optimized according to the evaluation results of the reservoir geology and engineering double sweet spots, and the repeated fracturing crack propagation numerical simulation is carried out, and then the fracturing construction process and parameters are optimized, forming the repeated fracturing design of geological engineering integration, and ensuring the reliability of repeated fracturing.

[0109] The fracturing result of fracturing the target reservoir includes the crack morphology.

[0110] In the above implementation process, according to the geological model of the target reservoir and the fault interpretation result in the seismic logging data, natural fracture modeling is first carried out to ensure that the natural fracture model can accurately represent the target reservoir. At the same time, rock mechanics parameters can also be obtained according to the logging data in the seismic logging data of the target reservoir, and then a model with mechanical properties is established according to the static rock mechanics parameters, that is, a three-dimensional heterogeneous mechanical model corresponding to the target reservoir. Then, the three-dimensional heterogeneous geological mechanical model is simulated for initial fracturing, and the initial fracturing simulation result is corrected based on the microseismic monitoring data of the three-dimensional heterogeneous mechanical model corresponding to the target reservoir, so that the initial fracturing simulation result can be accurately obtained. On the basis of obtaining the initial fracturing simulation result, the history fitting of the numerical simulation of the oil reservoir is carried out, and the present reservoir geostress field is obtained, and on this basis, repeated fracturing is carried out to ensure the reliability of repeated fracturing.

[0111] In summary, the embodiment of the present application discloses a repeated fracturing design method, the method comprising: obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data; establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model; performing primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result; correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and full-well-section production data to obtain a present reservoir geostress field; and performing repeated fracturing design according to the present reservoir geostress field. According to the fault interpretation result in the seismic logging data of the target reservoir, natural fracture modeling is first performed to ensure that the natural fracture model can accurately represent the natural fracture morphology and distribution characteristics of the target reservoir. Meanwhile, the rock mechanics parameters can also be obtained according to the logging data in the seismic logging data of the target reservoir. Then, a three-dimensional heterogeneous mechanics model with mechanical properties is established according to the static rock mechanics parameters. After the three-dimensional heterogeneous geomechanics model is simulated for primary fracturing, the primary fracturing simulation result is corrected based on the microseismic monitoring data of the three-dimensional heterogeneous mechanics model corresponding to the target reservoir, so that the primary fracturing simulation result can be accurately obtained. On the basis of the primary fracturing simulation result, reservoir numerical simulation history matching is carried out to obtain a present reservoir geostress field. On this basis, repeated fracturing is performed to ensure the reliability of the repeated fracturing.

[0112] Example Two

[0113] On the basis of the first embodiment, the embodiment is described by a specific implementation case.

[0114] The repeated fracturing design method comprises:

[0115] obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0116] establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0117] performing primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result;

[0118] correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and full-well-section production data to obtain a present reservoir geostress field; wherein the primary fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model and the primary fracturing simulation result.

[0119] According to the present reservoir geostress field, a repeated fracturing design is performed.

[0120] The three-dimensional heterogeneous geomechanics model of the target reservoir is established according to the natural fracture model, the rock mechanics parameters and the geology model, and includes:

[0121] The relationship between the reservoir porosity of the target reservoir along the well trajectory direction and the rock mechanics parameters is obtained;

[0122] The three-dimensional rock mechanics attribute field of the target reservoir is constructed according to the relationship, the rock mechanics parameters and the geology model;

[0123] The geostress field of the target reservoir is calculated according to the natural fracture model and the three-dimensional rock mechanics attribute field;

[0124] The three-dimensional heterogeneous geomechanics model is established according to the three-dimensional rock mechanics attribute field and the geostress field.

[0125] In the first embodiment, when the three-dimensional heterogeneous geomechanics model of the target reservoir is established according to the natural fracture model, the rock mechanics parameters and the geology model, the Young's modulus, Poisson's ratio and other rock mechanics dynamic parameters of the target reservoir are calculated according to the logging data including shale content, acoustic wave, density, porosity and other data in the seismic logging data. Then, the model with mechanical properties is established according to the rock mechanics parameters calculated above, that is, the three-dimensional heterogeneous mechanical model corresponding to the target reservoir.

[0126] Since static mechanical parameters are needed when the model with mechanical properties is established according to the rock mechanics parameters, when the model with mechanical properties is established according to the rock mechanics dynamic parameters, the rock mechanics static parameters can be obtained according to the rock mechanics dynamic parameters first, and then the model with mechanical properties is established according to the rock mechanics static parameters.

[0127] When the rock mechanics parameters of the target reservoir are obtained according to the seismic logging data, the dynamic rock mechanics parameters can be calculated according to the seismic logging data first; then the dynamic-static parameter conversion relationship is obtained, and the rock mechanics dynamic parameters are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0128] In the above implementation process, since the rock mechanics parameters obtained according to the seismic logging data are dynamic mechanics parameters, and the mechanics parameters required by the stress field calculation and the fracture propagation calculation are static rock mechanics parameters. Therefore, the dynamic-static parameter conversion relationship can be obtained first, and then the dynamic rock mechanics parameters obtained according to the seismic logging data of the entire target reservoir are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0129] In the process of obtaining the dynamic-static parameter conversion relationship, the dynamic-static parameter conversion relationship determined in advance and stored in a storage space set in advance can be directly obtained. It can be understood that the well corresponding to the obtained dynamic-static parameter conversion relationship determined in advance is the same well or the same block as the target reservoir. At this time, the dynamic-static parameter conversion relationship of the well is directly obtained as the dynamic-static parameter conversion relationship corresponding to the target reservoir, under the condition that the dynamic-static parameter conversion relationship of the well is mastered in advance. In addition, the static rock mechanics parameters can be obtained according to the indoor rock mechanics experiment test first; and then the dynamic-static parameter conversion relationship is determined according to the static rock mechanics parameters. Since the indoor rock mechanics experiment can obtain the static rock mechanics parameters, the dynamic-static parameter conversion relationship can be determined by the static rock mechanics parameters obtained by the indoor rock mechanics experiment, so as to ensure that the dynamic rock mechanics parameters corresponding to the target reservoir can be accurately converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0130] After the natural fracture distribution of the target reservoir is modeled according to the fault interpretation result in the seismic logging data, the acoustic time difference, density logging and other basic data included in the logging data in the seismic logging data can be used to calculate the rock mechanics dynamic parameters such as Young's modulus and Poisson's ratio of the reservoir, in combination with the logging interpretation of shale content and porosity, and the dynamic-static parameter conversion relationship is determined with the aid of the static rock mechanics data measured by the indoor experiment, and all the rock mechanics parameters calculated from the logging data are converted into static parameters.

[0131] Since the target reservoir is a three-dimensional data body, and the logging data is only one-dimensional data along the well trajectory direction, it is impossible to directly establish a three-dimensional mechanics field of the reservoir. Therefore, the relationship characteristics of the reservoir porosity and rock mechanics parameters along the well trajectory direction need to be obtained first, the mechanical properties are given to the entire geological model of the target reservoir according to the relationship characteristics, the three-directional stress field of the target reservoir is calculated, and then the three-dimensional heterogeneous geomechanical model of the target reservoir is established.

[0132] In the method, when the rock mechanics parameters of the target reservoir are obtained according to the seismic logging data, first, dynamic rock mechanics parameters are calculated according to the seismic logging data, then a dynamic-static parameter conversion relationship is obtained, and the dynamic rock mechanics parameters are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship. Since the rock mechanics parameters obtained according to the seismic logging data are all dynamic mechanics parameters, and the mechanics parameters required by the calculation of the stress field and the calculation of the fracture propagation are all static rock mechanics parameters. Therefore, the dynamic-static parameter conversion relationship can be obtained first, and then the dynamic rock mechanics parameters obtained according to the seismic logging data of the whole target reservoir are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0133] Example Three

[0134] On the basis of Embodiment Two, this embodiment describes the method in Embodiment Two through a specific implementation case.

[0135] The repeated fracturing design method comprises:

[0136] obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0137] establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0138] performing a primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result;

[0139] correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and the full-well-section production data to obtain a present reservoir stress field; wherein the primary fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model and the primary fracturing simulation result;

[0140] performing repeated fracturing design according to the present reservoir stress field.

[0141] In the method, when the rock mechanics parameters of the target reservoir are obtained according to the seismic logging data, first, dynamic rock mechanics parameters are calculated according to the seismic logging data, then a dynamic-static parameter conversion relationship is obtained, and the dynamic rock mechanics parameters are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship. Since the rock mechanics parameters obtained according to the seismic logging data are all dynamic mechanics parameters, and the mechanics parameters required by the calculation of the stress field and the calculation of the fracture propagation are all static rock mechanics parameters. Therefore, the dynamic-static parameter conversion relationship can be obtained first, and then the dynamic rock mechanics parameters obtained according to the seismic logging data of the whole target reservoir are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0142] obtaining a relationship feature of reservoir porosity and the rock mechanics parameters of the target reservoir along a well trajectory direction;

[0143] constructing a three-dimensional rock mechanics attribute field of the target reservoir according to the relationship feature, the rock mechanics parameters and the geological model;

[0144] calculating a geo-stress field of the target reservoir according to the natural fracture model and the three-dimensional rock mechanics attribute field;

[0145] establishing the three-dimensional heterogeneous geomechanics model according to the three-dimensional rock mechanics attribute field and the geo-stress field.

[0146] In the implementation process, the target reservoir is a three-dimensional data body, and the logging data is one-dimensional data along the well trajectory direction, so that the three-dimensional mechanical field of the reservoir cannot be directly established. Therefore, the relationship characteristics of the reservoir porosity and the rock mechanics parameters along the well trajectory direction are acquired first, the mechanical properties are given to the entire geology model of the target reservoir according to the relationship characteristics, and the three-direction geo-stress field of the target reservoir is calculated, so as to ensure that the three-dimensional heterogeneous geomechanics model of the target reservoir can be established.

[0147] Example Four

[0148] On the basis of the first embodiment, the method in the first embodiment is described through a specific implementation case.

[0149] The repeated fracturing design method comprises:

[0150] acquiring a geology model and seismic logging data of a target reservoir, and acquiring a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0151] establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geology model;

[0152] performing primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result;

[0153] correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and the full-well-section production data to obtain a present reservoir geo-stress field; wherein the primary fracturing reservoir numerical simulation result is acquired according to the geology model, the natural fracture model and the primary fracturing simulation result;

[0154] performing repeated fracturing design according to the present reservoir geo-stress field.

[0155] The primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result comprises:

[0156] performing finite element numerical simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial primary fracturing simulation result;

[0157] acquiring a fracturing result of the target reservoir after primary fracturing;

[0158] The initial primary fracturing simulation result is corrected according to the fracturing result to obtain a primary fracturing simulation result.

[0159] After the three-dimensional heterogeneous geomechanics model corresponding to the target reservoir is established, an initial primary fracturing simulation result can be obtained by using a finite element numerical simulation method. There is a difference between the initial primary fracturing simulation result and the real primary fracturing result of the target reservoir. Therefore, the fracturing result after the primary fracturing of the target reservoir can be obtained. Therefore, the initial primary fracturing simulation result of the target reservoir can be corrected according to the fracturing result after the primary fracturing of the target reservoir, so as to correct the local physical property and fracture parameter in the initial primary fracturing simulation result of the target reservoir, so as to ensure the accuracy of the obtained primary fracturing simulation result.

[0160] Specifically, after the three-dimensional heterogeneous geomechanics model corresponding to the target reservoir is established, a horizontal well multi-stage multi-cluster primary fracturing fracture propagation numerical simulation can be carried out on the three-dimensional heterogeneous geomechanics model according to the pump injection program during the primary fracturing. There is a difference between the obtained primary fracturing simulation result and the real target reservoir fracturing simulation result. Therefore, the microseismic monitoring result of the primary fracturing of the target reservoir can be obtained, the local physical property and fracture parameter of the target reservoir are corrected, and the simulated simulation result in the primary fracturing simulation result is corrected, so as to ensure the accuracy of the obtained primary fracturing simulation result.

[0161] Example Five

[0162] On the basis of the first embodiment, the method in the first embodiment is described through a specific implementation case.

[0163] The repeated fracturing design method comprises:

[0164] Obtain a geological model and seismic logging data of a target reservoir, and obtain a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0165] Establish a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0166] Perform primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result;

[0167] Correct a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and the full well section production data to obtain a present reservoir geostress field; wherein the primary fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model and the primary fracturing simulation result;

[0168] According to the present reservoir geostress field, repeated fracturing design is performed.

[0169] The present reservoir geostress field is obtained according to the initial fracturing simulation result and the full-well-section production data.

[0170] The initial fracturing simulation result is obtained according to the initial fracturing simulation result and the full-well-section production data.

[0171] The calculated production is compared with the full-well-section production data to obtain the comparison result.

[0172] The reservoir numerical simulation model is corrected according to the comparison result, and the corrected reservoir numerical simulation model is obtained.

[0173] The present reservoir geostress field is obtained according to the present reservoir geostress field and the present formation pressure field.

[0174] The present reservoir geostress field is obtained according to the present reservoir geostress field and the present formation pressure field.

[0175] On the basis of the initial fracturing simulation result, reservoir numerical simulation is performed to calculate the production so far, and then production history matching is performed in combination with the full-well-section production data to correct the reservoir model, solve the pore pressure change around the fracture, and calculate the present reservoir geostress field based on poroelasticity.

[0176] As an implementation mode,

[0177] According to the present reservoir geostress field, repeated fracturing design is performed.

[0178] The repeated fracturing perforation cluster parameters are obtained according to the present reservoir geostress field.

[0179] The repeated fracturing simulation result is obtained by performing repeated fracturing fracture propagation numerical simulation according to the repeated fracturing perforation cluster parameters.

[0180] According to the repeated fracturing simulation result, repeated fracturing design is performed.

[0181] In the above implementation process, the repeated fracturing perforation cluster parameters are obtained on the basis of the present geostress field, and repeated fracturing fracture propagation numerical simulation is performed based on a three-dimensional heterogeneous geomechanics model to obtain a repeated fracturing simulation result, so as to optimize fracturing construction technology and parameters according to the repeated fracturing simulation result, and form a geology-engineering integrated repeated fracturing design.

[0182] Example Six

[0183] Please refer to Figure 2 , Figure 2 Another flowchart of a repeated fracturing design method provided in Embodiment Six of the present application.

[0184] On the basis of Embodiment One, the method in Embodiment One is illustrated through specific cases in the present embodiment.

[0185] A three-dimensional heterogeneous geomechanics model of the target reservoir can be established based on a Petrol geology model of the target reservoir, then combined with the fault interpretation results and logging data in the seismic logging data to obtain a natural fracture model and rock mechanics parameters of the target reservoir, and then based on the rock mechanics parameters, the natural fracture model of the target reservoir and the Petrol geology model to establish a three-dimensional heterogeneous geomechanics model of the target reservoir. On the basis of the three-dimensional heterogeneous geomechanics model, a multi-stage and multi-cluster fracture propagation simulation of the primary fracturing horizontal well is carried out, then based on the actual primary fracturing fracture morphology of the target reservoir, combined with the production dynamic situation, a reservoir numerical simulation is carried out, a single well production history matching is carried out on the simulation results, the change of the target reservoir geostress field since the production started is mastered, and under the current geostress field condition, a repeated fracturing fracture propagation simulation is carried out on the three-dimensional heterogeneous geomechanics model after the primary fracturing simulation, the repeated fracturing construction technology and parameters are optimized according to the simulation results, thereby forming a horizontal well repeated fracturing design method based on geology modeling, and further providing guidance for accurately developing secondary potential of old wells, increasing the target reservoir reconstruction volume, and further improving the single well productivity and recovery rate.

[0186] In the conventional method, the geologic model of the target reservoir established based on Petrol only contains basic attributes such as reservoir porosity, permeability, oil saturation, and lacks quantitative description of mechanical properties such as Young's modulus and ground stress, which makes it impossible to carry out numerical simulation of hydraulic fracture propagation. Therefore, based on the seismic data interpretation and reservoir description of the target reservoir, the distribution of faults and natural fractures can be finely modeled, and then the rock mechanics dynamic parameters such as Young's modulus and Poisson's ratio can be calculated by using the basic data such as sonic travel time and density logging in the logging data, combined with the logging interpretation of shale content and porosity, to obtain a three-dimensional heterogeneous geomechanical model. Among them, the static data of rock mechanics can be measured by laboratory experiments, and the conversion relationship between static and dynamic parameters can be determined according to the static data of rock mechanics and the dynamic parameters of rock mechanics, and all the dynamic parameters of rock mechanics calculated from the logging data are converted into static parameters of rock mechanics. In addition, since the target reservoir is a three-dimensional data body, and the logging data is only one-dimensional data along the well trajectory, it is impossible to directly establish a three-dimensional mechanical field of the reservoir, and it is necessary to first obtain the relationship characteristics of reservoir porosity and rock mechanics parameters along the well trajectory, and assign mechanical properties to the established geologic model according to the relationship characteristics, and calculate the three-directional ground stress field of the target reservoir, and then establish a three-dimensional heterogeneous geomechanical model of the target reservoir.

[0187] After the three-dimensional heterogeneous geomechanical model is established, the finite element numerical simulation method can be used to carry out numerical simulation of multi-stage and multi-cluster initial fracturing fracture propagation in horizontal wells according to the pump injection program of the target reservoir during the initial fracturing, and the initial initial fracturing simulation result is obtained. Then the initial initial fracturing simulation result is compared with the fracture morphology obtained by the field monitoring of the target reservoir during the actual initial fracturing of the target reservoir and the fracture morphology obtained by the fracturing microseismic monitoring data of the target reservoir, to correct the local physical properties and fracture parameters of the target reservoir, and to correct the initial fracturing simulation result. Then combined with the full well production data, the production history matching is carried out by using the reservoir numerical simulation method, the pore pressure change around the fracture is solved, and the present target reservoir stress field is calculated based on the poroelastic mechanics. On this basis, the repeated fracturing section can be optimized, and the repeated fracturing fracture propagation numerical simulation can be carried out based on the three-dimensional heterogeneous geomechanical model, the fracturing technology and parameters are optimized, and the integrated geologic engineering repeated fracturing design is formed.

[0188] The three-dimensional heterogeneous geomechanical model can clearly describe the changes in formation pressure and three-dimensional geostress in the target reservoir after the initial fracturing, clarify the production and drainage area of ​​the target reservoir, and ensure that the reservoir that was not effectively mobilized by the initial fracturing can be accurately transformed. Based on this three-dimensional heterogeneous geomechanical model after the initial fracturing simulation, the refracturing process parameters can be further optimized, and differentiated designs can be carried out for the heavily pressurized old fractures and the new fracture sections with perforation repair, thereby forming a horizontal well refracturing design plan for each section, providing a reliable basis for horizontal well refracturing transformation.

[0189] Example Seven

[0190] Based on the sixth embodiment, this embodiment illustrates the method in the sixth embodiment through a specific implementation case.

[0191] Please see Figure 3 , Figure 3 For the embodiment of this application Seven A schematic diagram of a target reservoir 3D geological model is provided. Seismic logging data for the target reservoir, including fault interpretation results and well logging data, is used to finely characterize the faults in the geological model. Furthermore, since faults often develop symbiotic fracture zones with consistent strike and dip around them, natural fractures are established in the areas surrounding the faults in the geological model based on a log-normal distribution. Furthermore, based on the fracture occurrence described by the geology, natural fractures are characterized where they develop in the local reservoir, completing the natural fracture modeling of the entire target reservoir.

[0192] According to the elastic wave theory, the dynamic Poisson's ratio and dynamic Young's modulus of reservoir rock mechanics can be calculated based on the P-wave time difference, density and other data obtained from well logging, as well as the porosity and mud content parameters obtained from well logging interpretation.

[0193]

[0194]

[0195] Where, v d is the dynamic Poisson's ratio, dimensionless; E d is the dynamic Young's modulus, GPa; AC is the longitudinal wave time difference, μs / m; TS is the shear wave time difference, μs / m, which is mainly calculated through the longitudinal wave time difference, volume density and mud content; DEN is the rock density g / cm3.

[0196] In the dynamic and static conversion of the rock mechanics dynamic parameters calculated above, the discontinuous static parameter test data points obtained from the indoor rock mechanics experiment can be regressed and analyzed with the dynamic mechanical parameters calculated from the logging data, so as to obtain the rock mechanics parameter conversion expression, and the dynamic parameters calculated from the logging can be inverted by using the expression, so as to obtain the continuous static rock mechanics parameters in the vertical direction.

[0197] The rock mass in the reservoir is mainly subjected to three directions of the main ground stress, i.e. the vertical ground stress, the horizontal maximum ground stress and the horizontal minimum ground stress. The vertical ground stress is mainly caused by the weight of the overlying rock mass, and the horizontal ground stress is not only related to the vertical ground stress, but also affected by the geological structure movement and the formation pressure. Therefore, the three-directional ground stress field of the target reservoir can be calculated according to the following calculation formula:

[0198]

[0199] In the formula, σ v is the overburden pressure, MPa; ΔD i is the thickness of the i-th section of the formation, m; ρ i is the average bulk density of the i-th section of the density logging curve, g / cm3.

[0200] The horizontal minimum ground stress calculation formula is:

[0201]

[0202] The horizontal maximum ground stress calculation formula is:

[0203]

[0204] In the formula, σ h and σ H are the horizontal minimum and maximum ground stresses, MPa; v is the static Poisson's ratio, dimensionless; P P is the formation pore pressure, MPa; α is the effective stress coefficient; S Th and S TH are the additional terms of the tectonic stress, MPa, which is a constant in a region and does not change with the depth of the target reservoir.

[0205] After the initial fracturing simulation of the three-dimensional heterogeneous geomechanical model, the fracture toughness can be introduced as the criterion for the fracture propagation based on the hydraulic fracturing fluid mass conservation equation, flow equation and rock deformation equation to simulate the fracture propagation of the multi-stage and multi-cluster fracturing of the horizontal well. Meanwhile, the critical stress analysis criterion can be used to consider the relationship between the pore pressure and the ground stress acting on the fracture surface, and the fracture orientation and the failure strength to simulate the failure behavior of the natural fracture when the hydraulic fracture and the natural fracture interfere to form the initial fracturing simulation result. The initial fracturing simulation result can be corrected according to the field microseismic monitoring data to correct the basic physical property parameters such as the reservoir filtration coefficient. Please refer to Figure 4 , Figure 4 The initial fracturing simulation result of the target reservoir and the present-day ground stress schematic diagram provided by the embodiment of the present application Seven can be seen from Figure 4 that near the fault and in the area where the natural fractures develop, the hydraulic fractures after fracturing often interfere with the natural fractures to form complex fracture and branch fracture; and in the area where the natural fractures do not develop, the simple fractures with double wings are often formed after fracturing.

[0206] When the production history matching is performed on the corrected simulation result according to the full well section production data, the flow of the fluid in the fracture and the matrix can be simulated based on the mass conservation equation, Darcy flow equation and fluid state equation with the help of the discrete fracture network model, wherein the three-dimensional finite element method of the triangle can be used to simulate the flow of the fluid in the fracture, and the full-discrete multi-dimensional Kriging finite element method can be used to simulate the flow of the fluid in the matrix to carry out the reservoir numerical simulation, match the oil well production history and obtain the present-day formation pressure distribution.

[0207] As can be seen from the horizontal minimum ground stress calculation formula and the horizontal maximum ground stress calculation formula, when the formation pressure changes, the horizontal minimum ground stress and the horizontal maximum ground stress will change, and the present-day horizontal minimum ground stress and the horizontal maximum ground stress can be obtained according to the horizontal minimum ground stress calculation formula and the horizontal maximum ground stress calculation formula.

[0208]

[0209]

[0210] In the formula, σ h ′ and σ H ′ are the present-day horizontal minimum ground stress and the horizontal maximum ground stress, MPa; P p ′ is the present-day formation pressure, MPa. As can be seen from Figure 4 , due to the long-term production, the pressure relief area around the fracture is obvious, and the reservoir pressure is obviously reduced.

[0211] On the basis of the present stress field, the interference of the initial fracturing cracks on the repeated fracturing can be considered to carry out the simulation of the crack propagation of the repeated fracturing, and the crack morphology of the repeated fracturing is obtained. Specifically, by optimizing the process parameters of the repeated fracturing, the differential fracturing design of the old crack modification and the new crack formation by hole filling can be formed, and a reliable basis for the repeated fracturing design of the horizontal well can be provided. Figure 5 The first post-fracturing crack morphology of the first section of the repeated fracturing design is shown in the dashed circle, and a total of 3 clusters are designed in this section, in which the second cluster is used to press the old crack, and the first cluster and the third cluster are used to form new cracks by hole filling. From the simulation results of the first cluster and the third cluster, Figure 5 As can be seen from the enlarged simulation results on the right, the expansion of this section mainly occurs along the old crack during the fracturing process, and the first cluster and the third cluster of the new hole do not crack, which is mainly due to the fact that the old crack is located in the low stress area, and the expansion of the crack forms the dominant crack after fracturing, while the first cluster and the third cluster are located in the high stress area, and the crack initiation and expansion are inhibited. After adding the temporary plugging material, the old crack stops expanding, and the first cluster and the third cluster of the new hole crack and expand, so that the three clusters of the design of this section are effectively modified. Therefore, it is recommended to use temporary plugging material for fracturing in this section, and to add temporary plugging agent after the old crack expands for a period of time to block the old crack and open the new crack.

[0212] Taking the repeated fracturing design of Well in Honghe Oilfield in Ordos Basin as an example, the well was fractured in 12 sections in early 2013, and the production lasted until June 2020. First, based on the reservoir seismic interpretation results and reservoir geological description, the faults and the symbiotic crack zone around the faults are finely described, then the dynamic rock mechanics parameters are calculated according to the sonic time difference, density logging data, combined with logging interpretation of shale content, porosity and other data, and the static rock mechanics attributes are obtained according to the dynamic and static parameter conversion relationship of rock mechanics, in which the Young's modulus is 17.2-39.6 GPa, and the Poisson's ratio is 0.25-0.3. On this basis, the reservoir stress is calculated, the horizontal minimum stress gradient is 0.016 MPa / m, the horizontal maximum stress gradient is 0.019 MPa / m, and the vertical stress gradient is 0.023 MPa / m, and a three-dimensional geomechanical model of the reservoir is established, as shown in Figure 6 Then, combined with the pumping program during the initial fracturing, the crack propagation morphology of the initial fracturing is simulated, and the physical parameters such as the reservoir filtration coefficient are corrected by comparing with the field microseismic monitoring data. The simulation results are shown in Figure 6 As shown in the enlarged simulation results on the right, due to the influence of faults and natural cracks, complex crack branches are formed in the post-fracturing cracks of the fracturing sections near the faults, and simple cracks are formed in the fracturing sections away from the faults. The crack propagates longitudinally, and the sixth section is taken as an example. Due to the existence of stress shielding, the crack height expansion is limited, and only in the low stress area, among them, Figure 7 The black part represents the hydraulic fracture.

[0213] Based on the production data from September 2013 to June 2020, numerical simulation of the oil reservoir is carried out, and the productivity is fitted based on the actual production data, and the calculation results are as followsFigure 8 The formation pressure is obviously low in the near-fracture drainage area, and the drainage radius is 20-30 m, as shown in FIG. 2. Figure 8

[0214] Based on the fracture shape in the initial fracturing simulation result and the present-day stress distribution, repeated fracturing design is carried out, and a total of 5 segments are designed, wherein the 4th and 5th segments are two cluster perforations, and the 1st to 3rd segments are three cluster perforations, and the fracture shape in the simulation result is shown in FIG. 3. Figure 9

[0215] The 1st, 2nd and 4th segments are related to the old fractures, and the fractures are first expanded along the fractures generated in the initial fracturing to become dominant fractures in the fracturing process. The perforation clusters of the new perforations are inhibited in the high stress area, and the fracture initiation and expansion are inhibited. After the old fractures are expanded for a period of time, the temporary plugging material is added to block the old fractures to open the new fractures, and the fractures of each cluster are uniformly expanded.

[0216] The 3rd and 5th segments are new fractures of the perforation, and the fractures of the new perforation clusters are initiated and expanded in the fracturing process, and the old fractures around the initial fracturing are also communicated. The fracture expansion is relatively uniform. Since the fractures of the two segments are relatively developed, it is suggested to appropriately increase the amount of silt or guanidine gum during the fracturing process, and then carry out large-scale volume fracturing after filtration.

[0217] Example Eight

[0218] Please refer to Figure 10 The application also provides a repeated fracturing design device 1000, which comprises:

[0219] A data processing module 1010 is configured to acquire a geological model and seismic logging data of a target reservoir, and acquire a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0220] A three-dimensional heterogeneous geomechanics model establishing module 1020 is configured to establish a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0221] An initial fracturing simulation module 1030 is configured to perform initial fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial fracturing simulation result;

[0222] A present-day reservoir stress field acquiring module 1040 is configured to correct an initial fracturing reservoir numerical simulation result according to the initial fracturing simulation result and the full-well-section production data to obtain a present-day reservoir stress field; wherein the initial fracturing reservoir numerical simulation result is acquired according to the geological model, the natural fracture model and the initial fracturing simulation result; ​​

[0223] The repeated fracturing module 1050 is configured to perform repeated fracturing design according to the current reservoir geostress field.

[0224] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the data processing module 1010 comprises:

[0225] The fault occurrence parameter acquisition unit is configured to acquire a fault occurrence parameter in the seismic logging data.

[0226] The natural fracture model establishing unit is configured to establish a natural fracture model of the target reservoir according to the fault occurrence parameter.

[0227] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the three-dimensional heterogeneous geomechanics model establishing module 1020 comprises:

[0228] The relationship feature acquisition unit is configured to acquire a relationship feature between reservoir porosity and the rock mechanics parameter along a well trajectory direction of the target reservoir.

[0229] The three-dimensional rock mechanics attribute field constructing unit is configured to construct a three-dimensional rock mechanics attribute field of the target reservoir according to the relationship feature, the rock mechanics parameter, and the geology model.

[0230] The geostress field calculation unit of the target reservoir is configured to calculate a geostress field of the target reservoir according to the natural fracture model and the three-dimensional rock mechanics attribute field.

[0231] The three-dimensional heterogeneous geomechanics model establishing unit is configured to establish the three-dimensional heterogeneous geomechanics model according to the three-dimensional rock mechanics attribute field and the geostress field.

[0232] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the data processing module 1010 comprises:

[0233] The dynamic rock mechanics parameter calculation unit is configured to calculate a dynamic rock mechanics parameter according to the seismic logging data.

[0234] The static rock mechanics parameter acquisition unit is configured to acquire a dynamic-static parameter conversion relationship, and convert the dynamic rock mechanics parameter into a static rock mechanics parameter according to the dynamic-static parameter conversion relationship.

[0235] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the static rock mechanics parameter acquisition unit comprises:

[0236] The indoor rock mechanics experiment data acquisition subunit is configured to acquire a static rock mechanics parameter according to indoor rock mechanics experiment testing.

[0237] The dynamic-static parameter conversion relationship determination sub-unit is configured to determine the dynamic-static parameter conversion relationship according to the static rock mechanics parameter.

[0238] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the initial fracturing simulation module 1030 includes:

[0239] The initial simulation unit is configured to perform finite element numerical simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial initial fracturing simulation result.

[0240] The initial fracturing result acquisition unit is configured to acquire a fracturing result of the target reservoir after initial fracturing.

[0241] The initial fracturing result acquisition unit is configured to correct the initial initial fracturing simulation result according to the fracturing result to obtain an initial fracturing simulation result.

[0242] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the present reservoir stress field acquisition module 1040 includes:

[0243] The reservoir numerical simulation unit is configured to perform reservoir numerical simulation according to the initial fracturing simulation result to obtain a calculated production.

[0244] The comparison unit is configured to compare the calculated production with the full well section production data to obtain the comparison result.

[0245] The correction unit is configured to correct the reservoir numerical simulation model according to the comparison result to obtain a corrected reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geology model, the natural fracture model and the initial fracturing simulation result.

[0246] The production history matching unit is configured to perform production history matching according to the corrected reservoir numerical simulation model to obtain the present reservoir formation pressure field.

[0247] The present reservoir geostress field acquisition unit is configured to acquire a geostress field of the target reservoir, and obtain the present reservoir geostress field according to the geostress field of the target reservoir and the present formation pressure field.

[0248] According to an embodiment of the present application, optionally, in the repeated fracturing design device 1000, the repeated fracturing module 1050 includes:

[0249] The repeated fracturing perforation cluster parameter acquisition unit is configured to acquire the repeated fracturing perforation cluster parameter according to the present reservoir geostress field.

[0250] A repeated fracturing simulation result acquisition unit is configured to perform repeated fracturing fracture propagation numerical simulation according to the repeated fracturing perforation cluster parameters to obtain repeated fracturing simulation results.

[0251] A repeated fracturing simulation unit is configured to perform repeated fracturing design according to the repeated fracturing simulation results.

[0252] In summary, the embodiment of the present application discloses a repeated fracturing design device 1000, which comprises: a data processing module 1010 configured to acquire a geological model and seismic logging data of a target reservoir, and acquire a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data; a three-dimensional heterogeneous geomechanics model establishment module 1020 configured to establish a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model; a primary fracturing simulation module 1030 configured to perform primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain primary fracturing simulation results; a present reservoir stress field acquisition module 1040 configured to correct primary fracturing reservoir numerical simulation results according to the primary fracturing simulation results and the full well section production data to obtain a present reservoir stress field; and a repeated fracturing module 1050 configured to perform repeated fracturing design according to the present reservoir stress field. According to the seismic logging data of the target reservoir, the natural fracture modeling is performed first to obtain a natural fracture model, so as to ensure that the natural fracture model can accurately represent the fracture morphology of the target reservoir. Meanwhile, the rock mechanics parameters are acquired according to the seismic logging data of the target reservoir, and then a three-dimensional heterogeneous geomechanics model is established according to the natural fracture model, the rock mechanics parameters and the geological model. The three-dimensional heterogeneous geomechanics model has mechanical properties, so that the primary fracturing simulation results can be accurately obtained after the primary fracturing simulation on the three-dimensional heterogeneous geomechanics model. The primary fracturing reservoir numerical simulation results are accurately corrected based on the primary fracturing simulation results and the full well section production data, and then the repeated fracturing design is performed according to the present reservoir stress field, so as to ensure the reliability of the repeated fracturing.

[0253] Example Nine

[0254] The embodiment also provides a computer readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card memory (for example, an SD or DX memory, etc.), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application store, etc., which stores a computer program. When the computer program is executed by a processor, the following method steps can be implemented.

[0255] obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data;

[0256] establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model;

[0257] performing primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result;

[0258] correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and the full-well-section production data to obtain a present reservoir geostress field, wherein the primary fracturing reservoir numerical simulation result is obtained according to the geological model, the natural fracture model and the primary fracturing simulation result;

[0259] performing repeated fracturing design according to the present reservoir geostress field.

[0260] Optionally, in the repeated fracturing design method described above,

[0261] obtaining a natural fracture model of the target reservoir according to the seismic logging data, comprises:

[0262] obtaining a fault occurrence parameter in the seismic logging data;

[0263] establishing the natural fracture model of the target reservoir according to the fault occurrence parameter.

[0264] Optionally, in the repeated fracturing design method described above, establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model, comprises:

[0265] obtaining a relationship feature of reservoir porosity of the target reservoir along a well trajectory direction and the rock mechanics parameters;

[0266] constructing a three-dimensional rock mechanics attribute field of the target reservoir according to the relationship feature, the rock mechanics parameters and the geological model;

[0267] calculating a geostress field of the target reservoir according to the natural fracture model and the three-dimensional rock mechanics attribute field;

[0268] establishing the three-dimensional heterogeneous geomechanics model according to the three-dimensional rock mechanics attribute field and the geostress field.

[0269] Optionally, in the repeated fracturing design method described above, obtaining rock mechanics parameters of the target reservoir according to the seismic logging data, comprises:

[0270] calculating dynamic rock mechanics parameters according to the seismic logging data;

[0271] obtaining a dynamic-static parameter conversion relationship, and converting the dynamic rock mechanics parameters into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

[0272] Optionally, in the repeated fracturing design method, the obtaining of the dynamic-static parameter conversion relationship comprises:

[0273] obtaining static rock mechanics parameters according to indoor rock mechanics experiment tests;

[0274] determining the dynamic-static parameter conversion relationship according to the static rock mechanics parameters.

[0275] Optionally, in the repeated fracturing design method, the initial fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial fracturing simulation result comprises:

[0276] performing finite element numerical simulation on the three-dimensional heterogeneous geomechanics model to obtain an initial fracturing simulation result;

[0277] obtaining a fracturing result of the target reservoir after initial fracturing;

[0278] correcting the initial fracturing simulation result according to the fracturing result to obtain a fracturing simulation result.

[0279] Optionally, in the repeated fracturing design method, the correction of the initial fracturing simulation result and the full-well-section production data to obtain a current reservoir geostress field comprises:

[0280] performing reservoir numerical simulation according to the initial fracturing simulation result to obtain a calculated production;

[0281] comparing the calculated production with the full-well-section production data to obtain a comparison result;

[0282] correcting a reservoir numerical simulation model according to the comparison result to obtain a corrected reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geologic model, the natural fracture model and the initial fracturing simulation result;

[0283] performing production history matching according to the corrected reservoir numerical simulation model to obtain a current formation pressure field of the reservoir;

[0284] obtaining a geostress field of a target reservoir, and obtaining the current reservoir geostress field according to the geostress field and the current formation pressure field of the target reservoir.

[0285] Optionally, in the repeated fracturing design method, the repeated fracturing design is performed according to the present reservoir geostress field, and the repeated fracturing design method comprises the following steps.

[0286] The repeated fracturing perforation cluster parameters are obtained according to the present reservoir geostress field.

[0287] The repeated fracturing crack propagation numerical simulation is performed according to the repeated fracturing perforation cluster parameters, and a repeated fracturing simulation result is obtained.

[0288] The repeated fracturing design is performed according to the repeated fracturing simulation result.

[0289] The specific implementation process of the above method steps can be referred to the above embodiments, and the embodiments will not be repeated here.

[0290] Example Ten

[0291] The electronic device can be a mobile phone, a computer, a tablet computer or the like, and comprises a memory and a processor. The memory stores a computer program, and the computer program is executed by the processor to implement the repeated fracturing design method in the embodiment one. It can be understood that, referring to Figure 11 , the electronic device 1100 can further comprise a processor 1101, a memory 1102, a multimedia component 1103, an input / output (I / O) interface 1104, and a communication component 1105.

[0292] The processor 1101 is configured to execute all or part of the steps of the repeated fracturing design method in the embodiment one. The memory 1102 is configured to store various types of data, which can include, for example, instructions of any application program or method in the electronic device, and application program related data.

[0293] The processor 1101 can be an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic elements, which is configured to execute the repeated fracturing design method in the above embodiment one.

[0294] The memory 1102 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0295] The multimedia component 1103 can include a screen, which can be a touch screen, and an audio component for outputting and / or inputting audio signals. For example, the audio component can include a microphone for receiving external audio signals. The received audio signals can be further stored in the memory or transmitted through the communication component. The audio component also includes at least one speaker for outputting audio signals.

[0296] The I / O interface 1104 provides an interface between the processor 1101 and other interface modules, which can be a keyboard, a mouse, a button, etc. These buttons can be virtual buttons or physical buttons.

[0297] The communication component 1105 is used for wired or wireless communication between the electronic device 1100 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so the corresponding communication component 1105 can include a Wi-Fi module, a Bluetooth module, an NFC module.

[0298] In summary, the application provides a repeated fracturing design method, device, storage medium and electronic equipment. The method comprises: obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir according to the seismic logging data; establishing a three-dimensional heterogeneous geomechanics model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model; performing primary fracturing simulation on the three-dimensional heterogeneous geomechanics model to obtain a primary fracturing simulation result; correcting a primary fracturing reservoir numerical simulation result according to the primary fracturing simulation result and full well section production data to obtain a present reservoir geostress field; and performing repeated fracturing design according to the present reservoir geostress field. According to the seismic logging data of the target reservoir, the natural fracture modeling is performed first to obtain the natural fracture model, so that the natural fracture model can accurately represent the fracture morphology of the target reservoir. Meanwhile, the rock mechanics parameters are obtained according to the seismic logging data of the target reservoir, and then the three-dimensional heterogeneous geomechanics model is established according to the natural fracture model, the rock mechanics parameters and the geological model. The three-dimensional heterogeneous geomechanics model has mechanical properties, so that the primary fracturing simulation result can be accurately obtained after the primary fracturing simulation is performed on the three-dimensional heterogeneous geomechanics model. The primary fracturing reservoir numerical simulation result is accurately corrected based on the primary fracturing simulation result and the full well section production data, and then the repeated fracturing design is performed according to the present reservoir geostress field, so that the reliability of the repeated fracturing is ensured.

[0299] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed system and method can also be implemented in other manners. The embodiments of the system and method described above are only illustrative.

[0300] It should be noted that, in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles, or devices that comprise a series of elements are not limited to those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or device that includes the element.

[0301] Although the embodiments disclosed in the present application are as above, the content described is only the embodiments adopted for the convenience of understanding the present application, and is not intended to limit the present application. Any person skilled in the art without departing from the spirit and scope of the present application can make any modification and change in the form and details of the implementation, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A repeated fracturing design method, characterized in that: The method comprises: Obtaining a geological model and seismic logging data of a target reservoir, and obtaining a natural fracture model and rock mechanics parameters of the target reservoir based on the seismic logging data; Establishing a three-dimensional heterogeneous geomechanical model of the target reservoir according to the natural fracture model, the rock mechanics parameters and the geological model; performing a primary fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain a primary fracturing simulation result; Correcting the initial fracturing reservoir numerical simulation results based on the initial fracturing simulation results and full-well production data to obtain a current reservoir in-situ stress field; wherein the initial fracturing reservoir numerical simulation results are obtained based on the geological model, the natural fracture model, and the initial fracturing simulation results; Conducting repeated fracturing design based on the present reservoir in-situ stress field; The initial fracturing reservoir numerical simulation results are corrected according to the initial fracturing simulation results and the full-well production data to obtain the current reservoir geostress field, including: performing reservoir numerical simulation according to the initial fracturing simulation results to obtain a calculated production; comparing the calculated production with the full-well production data to obtain the comparison result; correcting the reservoir numerical simulation model according to the comparison result to obtain a corrected reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geological model, the natural fracture model and the initial fracturing simulation results; performing production history fitting according to the corrected reservoir numerical simulation model to obtain the current formation pressure field of the reservoir; obtaining the geostress field of the target reservoir, and obtaining the current reservoir geostress field according to the geostress field of the target reservoir and the current formation pressure field.

2. The method according to claim 1, wherein Acquiring a natural fracture model of the target reservoir according to the seismic logging data includes: Obtaining fault occurrence parameters from the seismic logging data; A natural fracture model of the target reservoir is established according to the fault occurrence parameters.

3. The method according to claim 1, wherein Establishing a three-dimensional heterogeneous geomechanical model of the target reservoir according to the natural fracture model, the rock mechanical parameters, and the geological model includes: Obtaining relationship characteristics between the reservoir porosity of the target reservoir along the well trajectory and the rock mechanical parameters; constructing a three-dimensional rock mechanical property field of the target reservoir according to the relationship characteristics, the rock mechanical parameters and the geological model; Calculating the in-situ stress field of the target reservoir based on the natural fracture model and the three-dimensional rock mechanics property field; The three-dimensional heterogeneous geomechanical model is established according to the three-dimensional rock mechanical property field and the ground stress field.

4. The method according to claim 1, wherein Obtaining rock mechanical parameters of the target reservoir according to the seismic logging data includes: calculating dynamic rock mechanics parameters based on the seismic logging data; A dynamic-static parameter conversion relationship is obtained, and the rock mechanics dynamic parameters are converted into static rock mechanics parameters according to the dynamic-static parameter conversion relationship.

5. The method according to claim 1, wherein Performing an initial fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain an initial fracturing simulation result includes: Performing finite element numerical simulation on the three-dimensional heterogeneous geomechanical model to obtain initial primary fracturing simulation results; Obtaining a fracturing result after the initial fracturing of the target reservoir; The initial primary fracturing simulation result is corrected according to the fracturing result to obtain a primary fracturing simulation result.

6. The method according to claim 1, wherein Based on the current reservoir in-situ stress field, repeated fracturing design is carried out, including: Obtaining the re-fracturing perforation section cluster parameters according to the current reservoir in-situ stress field; performing a numerical simulation of refracturing crack propagation according to the refracturing perforation section cluster parameters to obtain a refracturing simulation result; Refracturing design is performed according to the refracturing simulation results.

7. A repeated fracturing design device, characterized in that: The device comprises: A data processing module is used to obtain a geological model and seismic logging data of a target reservoir, and to obtain a natural fracture model and rock mechanics parameters of the target reservoir based on the seismic logging data; a three-dimensional heterogeneous geomechanical model building module, configured to build a three-dimensional heterogeneous geomechanical model of the target reservoir based on the natural fracture model, the rock mechanics parameters, and the geological model; A primary fracturing simulation module, configured to perform a primary fracturing simulation on the three-dimensional heterogeneous geomechanical model to obtain a primary fracturing simulation result; a current reservoir stress field acquisition module, configured to correct the initial fracturing reservoir numerical simulation results based on the initial fracturing simulation results and full-well production data to obtain the current reservoir in-situ stress field; wherein the initial fracturing reservoir numerical simulation results are obtained based on the geological model, the natural fracture model, and the initial fracturing simulation results; A re-fracturing module, used for performing re-fracturing design according to the current reservoir in-situ stress field; The current reservoir stress field acquisition module includes: a reservoir numerical simulation unit, which is used to carry out reservoir numerical simulation according to the initial fracturing simulation result to obtain a calculated production; a comparison unit, which is used to compare the calculated production with the production data of the entire well section to obtain the comparison result; a correction unit, which is used to correct the reservoir numerical simulation model according to the comparison result to obtain a corrected reservoir numerical simulation model, wherein the reservoir numerical simulation model is obtained according to the geological model, the natural fracture model and the initial fracturing simulation result; a production history fitting unit, which is used to carry out production history fitting according to the corrected reservoir numerical simulation model to obtain the current formation pressure field of the reservoir; a current reservoir in-situ stress field acquisition unit, which is used to obtain the in-situ stress field of the target reservoir, and obtain the current reservoir in-situ stress field according to the in-situ stress field of the target reservoir and the current formation pressure field.

8. A storage medium, characterized in that: The computer program stored in the storage medium is used to implement the refracturing design method according to any one of claims 1 to 6 when executed by one or more processors.

9. An electronic device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the repeated fracturing design method according to any one of claims 1 to 6 is executed.

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