Hydrofracture interval division method and device, electronic equipment and storage medium

Abstract

The hydraulic fracturing interval division method provided by the embodiment of the invention comprises the following steps: collecting compact thick sandstone stratum cycle and reservoir physical property parameter characteristics and rock mechanical property and parameter characteristics, carrying out normalization processing on physical property parameters, establishing a physical property parameter set, and defining physical property similarity coefficients; based on the processed physical property parameter characteristics, the reservoir is preliminarily divided, and geologic interval division is completed; according to rock mechanics parameters, the number of layers divided by the geological layers is combined, and fine division of engineering layers of the reservoir is determined; establishing a separate layer fracturing crack propagation simulation model according to the number of layers divided by the engineering layer sections, and establishing a hydraulic fracturing crack propagation criterion parameter chart; and determining a final interval division result according to the hydraulic fracturing crack propagation criterion chart. In the embodiment of the invention, the thick compact sandstone reservoir is fully and efficiently transformed, meanwhile, the drilling and fracturing construction cost is reduced, and the oil and gas field recovery ratio and the economic benefit are improved to the maximum extent.

Description

Technical Field

[0001] The present application belongs to the field of oil and gas field development, and specifically relates to a method, device, electronic equipment and storage medium for hydraulic fracturing segmentation of dense thick sandstone based on reservoir heterogeneity. Background Art

[0002] Layer division is an important factor affecting the fracturing transformation and development effect of tight sandstone reservoirs. In order to achieve the full transformation of extremely thick sandstone layers with a thickness of more than 50m, it is necessary to finely divide the fracturing layers, especially considering the influence of the vertical reservoir physical properties of sandstone and the heterogeneity of rock mechanical parameters on the high expansion of fractures. The existing layer division method mainly divides the fracturing layers from a geological perspective, but does not consider the matching between the high expansion of fractures and the fracturing layer division from the perspective of geological and engineering integration. In particular, for the full fracturing transformation of extremely thick and tight sandstone reservoirs, the matching of the two is particularly important. Therefore, a geological-engineering integrated quantitative evaluation method is invented to finely divide the fracturing layers of thick and tight sandstone reservoirs, which is of great significance for the full transformation of thick and tight sandstone reservoirs.

[0003] Searching the Derwent database, the patent database of the State Intellectual Property Office, and the CNKI journal database of Tsinghua Tongfang, the literature research on the division of thick and tight sandstone hydraulic fracturing layers can be divided into two categories: (1) When dividing the layers, geological factors are mainly considered, and engineering factors are less considered. For example, the document "Study on the evaluation method of layers based on sand body superposition and interlayer parameter difference" selects indicators such as oil-bearing area coverage, oil-bearing sand body superposition, oil content, oil saturation, and seepage resistance to determine the interlayer variation coefficient as the layer evaluation parameter to divide the layers. The document "Study on the division method of layers of simulated horizontal well development" uses geological parameters as the definition standard to divide the layers, mainly merging reservoirs with similar physical properties and dividing reservoirs with obvious physical property differences. (2) When dividing the layers, the fracturing engineering factors are considered, mainly from the perspective of improving the seepage performance of the continental deposited thin sandstone layer and reducing the interlayer interference to determine the fracturing layer division scheme. For example, the invention patent "Stratum Division and Perforation Scheme Optimization Method for Offshore Thin Interbedded Sandstone Oilfields (CN202011339613.X)" quantitatively evaluates the degree of vertical heterogeneity of thin interbedded sandstone oilfields, establishes a quantitative prediction chart for interlayer interference coefficients, and uses the revised directional well productivity formula to optimize the stratum division scheme. The document "Study on the Stratum Division and Reasonable Well Spacing Optimization of Shale Gas Development in Pingqiao Anticline, Nanchuan Block" focuses on the vertical characterization of rock microfacies and stress characteristics based on a detailed description of the reservoir, clarifies its influence on the height and length of the fracture, and uses microseismic monitoring, gas well production data history fitting and other technical methods to clarify the division of the development stratum. The document "Optimization of CO2 Driven Stratum Combination in Multi-Thin-Layer Ultra-Low Permeability Beach-Bar Sand Reservoirs" uses reservoir numerical simulation methods to analyze the influence of reservoir permeability, oil saturation and oil layer thickness on the stratum combination, and establishes a comprehensive effective fluidity that takes into account the main geological control factors and the influence of the start-up pressure gradient and fracturing as a characterization indicator of the stratum combination.

[0004] The patents and literatures retrieved mainly consider geological and engineering factors such as interlayer interference and high fracture extension when selecting layers and sections for single or combined fracturing of thin sandstone, but lack research on the influence of longitudinal heterogeneity inside thick sandstone on fracture extension. There is a lack of targeted methods for quantitative and fine division of geological and engineering integrated fracturing sections that comprehensively consider geological properties and rock mechanics parameters. Summary of the invention

[0005] In view of this, the present application provides a hydraulic fracturing layer segmentation method, device, electronic equipment and storage medium. Based on the geological engineering heterogeneity characteristics within the dense thick sandstone reservoir and the law of fracturing crack expansion, the fine division of the intra-layer fracturing layer is carried out to achieve full and efficient transformation of the thick dense sandstone reservoir, while reducing the drilling and fracturing construction costs, maximizing the recovery rate and economic benefits of the oil and gas field, so as to solve the problem that it is difficult to achieve full and efficient transformation of dense thick sandstone reservoirs in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a method for dividing hydraulic fracturing layers, comprising:

[0007] Collect the cycle and reservoir physical property parameter characteristics of dense thick sandstone formations, rock mechanical properties and parameter characteristics, normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient;

[0008] Based on the processed dense thick sandstone formation cycles and reservoir physical property parameter characteristics, the reservoir is preliminarily divided according to the principle of minimizing the number of layers, the geological layer division is completed, and the rough division of hydraulic fracturing layers is determined;

[0009] According to the collected dense thick sandstone rock mechanical parameters, the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria are set, and the number of layers divided by the geological layer segment is merged according to the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria to determine the fine division of the engineering layer segment of the reservoir;

[0010] A layered fracturing fracture expansion simulation model is established according to the number of layers divided into the engineering layer sections, a combined relationship between fracture height and fracture length during fracture expansion is determined, and a hydraulic fracturing fracture expansion criterion parameter chart is established;

[0011] According to the hydraulic fracturing crack extension criterion chart, the fracturing crack extension is simulated, the layer segments with fracture height extension are subdivided and merged, the number of layer segments and layer segment thickness for dense thick sandstone fracturing division are determined, the final layer segment division result is determined, and the geological engineering integrated fracturing layer segment division is completed.

[0012] In a possible implementation, the collection of tight thick sandstone formation cycles and reservoir physical property parameter characteristics, rock mechanical properties and parameter characteristics, and normalization of the collected physical property parameters, establishment of a physical property parameter set, and definition of a physical property similarity coefficient include:

[0013] Use formula (1) to normalize individual physical property parameters;

[0014]

[0015] In the formula, R i,j is the i-th value of the j-th parameter, min{R 1,j ,R 2,j …R n,j} is the minimum value of all the values ​​of the jth parameter, max{R 1,j ,R 2,j …R n,j} is the maximum value of all values ​​of the jth parameter;

[0016] Establish the geological property parameter set R:

[0017]

[0018] Define the physical property similarity coefficient X:

[0019]

[0020] In a possible implementation, the minimum horizontal principal stress difference, brittleness index difference and high stress layer identification criteria are set according to the collected dense thick sandstone rock mechanical parameters, and the number of layers divided into the geological layers is merged according to the minimum horizontal principal stress difference, brittleness index difference and high stress layer identification criteria to determine the fine division of the engineering layers of the reservoir, including:

[0021] Based on the collected rock mechanical parameters of dense thick sandstone, the minimum horizontal principal stress, maximum horizontal principal stress, brittleness index, Young's modulus, Poisson's ratio, and fracture pressure rock mechanical parameters are determined, and the factor set S is established using formula (4):

[0022]

[0023] According to the logging data and geological data, the rock mechanics parameters are determined, the minimum horizontal principal stress difference is set, the number of layers divided by the geological layer is merged, and the number of layers of the engineering layer is determined according to the principle of minimizing the number of layers, and the number of vertical layers of the geological model is determined at the same time. Among them, the vertical layering of the geological model can be determined according to the calculated physical property similarity coefficient. If the similarity coefficient is greater than the set value, it is divided into two layers, and if the similarity coefficient is less than the set value, it is divided into one layer. The geological model can be established using commercial software such as Petre l and Fracman, or it can be established using self-developed software.

[0024] In a possible implementation, the principle of minimizing the number of layers is that the consistent geological layer segment division and engineering layer segment division remain unchanged, and the inconsistent layers are merged into small layers to minimize the number of layers. In other words, the inconsistent geological layer segments and engineering layer segments are merged. Among them, the small layer can also be understood as a layer segment.

[0025] In a possible implementation, the layered fracturing fracture propagation simulation model is established according to the number of layers divided into the engineering layer sections, the combined relationship between the fracture height and the fracture length during the fracture propagation process is determined, and a hydraulic fracturing fracture propagation criterion parameter chart is established, including:

[0026] The layered fracturing fracture extension simulation model simulates the fracturing process under different working conditions, thereby determining the combined relationship between fracture height and fracture length during the fracture extension process;

[0027] According to the combined relationship between fracture height and fracture length during fracture propagation, a fracture propagation criterion parameter chart is established, that is, a fracture height and fracture length variation curve chart under different rock mechanics parameters is established.

[0028] In a possible implementation, according to the hydraulic fracturing crack extension criterion plate, the fracturing crack extension is simulated, the layer sections with fracture height extension are subdivided and merged, the number of layers and layer thickness of the dense thick sandstone fracturing division are determined, the final layer division result is determined, and the geological engineering integrated fracturing layer division is completed, including:

[0029] According to the hydraulic fracturing fracture extension criterion chart, combined with the hydraulic fracturing fracture extension simulation, the layer sections that are difficult to be completely covered by the fracture height are further subdivided;

[0030] The small layers where the fracture height crosses multiple layers are subdivided and merged. Based on the concept of geological engineering integration, the number and thickness of dense thick sandstone fracturing layers are obtained, the final division results are determined, and the geological engineering integrated fracturing layer division is completed.

[0031] In a second aspect, an embodiment of the present application provides a hydraulic fracturing layer segmentation device, comprising:

[0032] Physical property parameter normalization processing module: used to collect the physical property parameter characteristics of dense thick sandstone formation cycles and reservoirs, rock mechanical properties and parameter characteristics, and normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient;

[0033] Hydraulic fracturing layer rough division module: It is used to preliminarily divide the reservoir based on the processed dense thick sandstone formation cycle and reservoir physical parameter characteristics, adopt the principle of minimizing the number of layers, complete the geological layer segment division, and determine the rough division of hydraulic fracturing layers;

[0034] Engineering layer fine division module: used to set the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria according to the collected dense thick sandstone rock mechanical parameters, merge the number of layers divided by the geological layer according to the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria, and determine the fine division of the engineering layer of the reservoir;

[0035] A fracture extension criterion parameter chart acquisition module is used to establish a layered fracturing fracture extension simulation model according to the number of layers divided into the engineering layer sections, determine the combined relationship between fracture height and fracture length during fracture extension, and establish a hydraulic fracturing fracture extension criterion parameter chart;

[0036] The geological engineering integrated fracturing layer segment division module is used to simulate the expansion of the hydraulic fracturing cracks according to the hydraulic fracturing crack expansion criterion chart, subdivide and merge the layer segments with fracture height expansion, determine the number of layer segments and layer segment thickness for the dense thick sandstone fracturing division, determine the final layer segment division results, and complete the geological engineering integrated fracturing layer segment division.

[0037] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0038] processor;

[0039] Memory;

[0040] And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes any one of the methods described in the first aspect.

[0041] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located executes any one of the methods described in the first aspect.

[0042] In the embodiment of the present application, firstly, based on the cycle of dense thick sandstone formation and the characteristics of reservoir physical parameters, rock mechanical properties and parameter characteristics, geological parameter segment division and rock mechanical segment division are carried out respectively, and the principle of minimizing the number of layers is adopted to determine the rough division of hydraulic fracturing stratification; secondly, a high expansion model of internal pressure fractures in thick dense sandstone is established based on the rough division number of layers, and the combination relationship between the fracture height and the fracture length in the process of fracture expansion under different working conditions is simulated, so as to establish a fracture expansion criterion parameter plate; finally, a layered fracturing fracture expansion simulation model is established based on the established geological model, and the fracturing process under different working conditions is simulated to determine the combination relationship between the fracture height and the fracture length in the process of fracture expansion, and establish a fracture expansion criterion parameter plate to achieve the maximum fracturing transformation of dense reservoir sandstone, and avoid the interference between the fractures between the three-dimensional fracture network, so as to achieve full and efficient transformation of thick dense sandstone reservoirs, while reducing the cost of drilling and fracturing construction, and maximizing the recovery rate and economic benefits of oil and gas fields, so as to solve the problem that it is difficult to achieve full and efficient transformation of dense thick sandstone reservoirs in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 A flow chart of a hydraulic fracturing layer segmentation method provided in an embodiment of the present application;

[0045] Figure 2 A flowchart of a specific implementation of a hydraulic fracturing layer segmentation method provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of hydraulic fracturing segmentation based on geological parameters provided in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of layer segmentation based on rock mechanics parameters of hydraulic pressure provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of a high expansion criterion for hydraulic fractures in a target block provided in an embodiment of the present application;

[0049] Figure 6 The expansion diagram of the hydraulic fracturing cracks in the D1 and D2 layers provided in the embodiment of the present application;

[0050] Figure 7 A diagram of the expansion of the D3 layer hydraulic fracturing crack provided in the embodiment of the present application;

[0051] Figure 8 A diagram of the expansion of the D4 layer hydraulic fracturing crack provided in the embodiment of the present application;

[0052] Fig. 9 A structural block diagram of a hydraulic fracturing layer segment division device provided in an embodiment of the present application;

[0053] Fig.10 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0055] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0057] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0058] The existing stratum division method mainly divides the fracturing layer from the geological perspective, but does not consider the matching between the high extension of the fracture and the fracturing layer division from the perspective of geological and engineering integration. In particular, it is difficult to achieve sufficient and efficient fracturing transformation of the thick and tight sandstone reservoir.

[0059] In response to the above problems, the present application provides a method for hydraulic fracturing layer division. Based on the geological engineering heterogeneity characteristics within the dense thick sandstone reservoir and the law of fracturing crack expansion, a fine division of the intra-layer fracturing layers is carried out to achieve full and efficient transformation of the thick and dense sandstone reservoir, while reducing the cost of drilling and fracturing construction, and maximizing the recovery rate and economic benefits of the oil and gas fields.

[0060] In order to make the technical content and technical advantages of the present invention clearer, the present invention is further described below in conjunction with the accompanying drawings and examples of intralayer fine fracturing segment division in a dense sandstone thick reservoir block in Canada. It should be pointed out that: unless otherwise defined, the relevant terms used in the present invention should be technical terms that can be understood by technicians with general skills in the technical field to which the present invention belongs, and are described in detail below in conjunction with the accompanying drawings.

[0061] See also Figure 1 , is a schematic diagram of a flow chart of a hydraulic fracturing layer segmentation method provided in an embodiment of the present application. Figure 2 A specific implementation flow chart of a hydraulic fracturing layer segmentation method provided in an embodiment of the present application is as follows: Figure 1 As shown, it mainly includes the following steps.

[0062] S101: Collect the cycle and reservoir physical property parameter characteristics of dense thick sandstone formations, rock mechanical properties and parameter characteristics, normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient;

[0063] S102: Based on the processed dense thick sandstone formation cycles and reservoir physical property parameter characteristics, the reservoir is preliminarily divided according to the principle of minimizing the number of layers, the geological layer division is completed, and the rough division of hydraulic fracturing layers is determined;

[0064] In the specific implementation, firstly, the individual physical property parameters are normalized using formula (1);

[0065]

[0066] In the formula, R i,j is the i-th value of the j-th parameter, min{R 1,j ,R 2,j …R n,j} is the minimum value of all the values ​​of the jth parameter, max{R 1,j ,R 2,j …R n,j} is the maximum value of all values ​​of the jth parameter;

[0067] Establish the geological property parameter set R:

[0068]

[0069] Define the physical property similarity coefficient X:

[0070]

[0071] In the embodiment of the present application, taking a dense sandstone thick reservoir block in Canada to carry out fine fracturing segmentation within the layer as an example, the geological and physical property data of the target block are first collected. The block is a set of coastal sedimentary sand bodies. The upper coastal subfacies can identify two microfacies, the coastal sand bar and the coastal beach. The hydrodynamic conditions in the transition zone are complex, and the coastal beach microfacies are mainly developed. Sand bars are locally developed and the scale is small. The lower section mainly develops far-shore beaches. The reservoir thickness is as high as 162m, with a burial depth of 2680m-2842m. The mud and dolomite content increases from top to bottom, the porosity is less than 5%, the permeability is 0.003-0.005md, the reservoir is dense, and bedding fractures are developed in the depth range of 2804m-2842m. The reservoir is divided into three sections based on three different subfacies zones: coastal, transitional and far-shore. The four parameters of porosity, permeability, gas saturation and mud content are used to establish a physical property parameter set:

[0072]

[0073] Calculate the physical property similarity coefficient X:

[0074]

[0075] Define the geological property similarity limit value X a According to literature reports, this value can be determined based on the thickness of the layer, the degree of heterogeneity, and the requirements of the fracturing process, and is generally 3-7. a When X≥3, the adjacent layers can be divided into one layer. Based on this, the reservoir is initially divided into 7 geological layers, such as Figure 3 , as shown in Table 1:

[0076] Table 1 Division of geological layers

[0077]

[0078]

[0079] The principle of minimizing the number of stratified layers is that the consistent geological layer division and engineering layer division remain unchanged, and the inconsistent ones are merged into small layers to minimize the number of layers.

[0080] S103: according to the collected dense thick sandstone rock mechanical parameters, the minimum horizontal principal stress difference, the brittleness index difference and the high stress layer identification criteria are set, and the number of layers divided by the geological layer segment is merged according to the minimum horizontal principal stress difference, the brittleness index difference and the high stress layer identification criteria to determine the fine division of the engineering layer segment of the reservoir;

[0081] Identify the barrier layer based on rock mechanics parameters and divide the fracturing engineering mechanics layer segments: Calculate rock mechanics parameters such as minimum horizontal principal stress, maximum horizontal principal stress, brittleness index, Young's modulus, Poisson's ratio, and fracture pressure based on well logging data and geological data, and establish factor set S:

[0082]

[0083] Based on the understanding and simulation analysis of the high expansion law of hydraulic fractures, the main controlling factors affecting the high expansion of hydraulic fractures are determined, and the minimum horizontal principal stress difference and brittleness index are determined as the main parameters for identifying the barrier layer, thereby dividing the hydraulic fracture engineering mechanics layer segment. According to the literature, the minimum horizontal principal stress difference limit Δσ a It can be 3 to 6, and the brittleness index difference limit ΔB ra It can be taken as 0.2-0.5. Set the minimum horizontal principal stress difference Δσ h >Δσ a , brittleness index difference ΔB r >ΔB ra When the high stress layer is considered as the barrier layer, the rock mechanics layer sections are divided accordingly.

[0084] Calculate rock mechanical parameters based on logging data and geological data, and set the minimum horizontal principal stress difference Δσ h >3MPa, brittleness index difference ΔB r When >0.2, the high stress layer can be regarded as a barrier layer. There is no high stress barrier layer inside the 7 geological layers divided, and the stress difference between L1 and L2, L3 and L4, L5 and L6 is less than 3MPa, and the brittleness index difference is less than 0.2. There is no high stress barrier. After merging, it is divided into 4 engineering layers, such as Figure 4 , as shown in Table 2:

[0085] Table 2 Engineering layer division

[0086] interval Depth range <![CDATA[D1]]> 2680m-2718m <![CDATA[D2]]> 2718m-2760m <![CDATA[D3]]> 2760m-2804m <![CDATA[D4]]> 2804m-2842m

[0087] S104: establishing a layered fracturing crack extension simulation model according to the number of layers divided into the engineering layer sections, determining the combined relationship between the crack height and the crack length during the crack extension process, and establishing a hydraulic fracturing crack extension criterion parameter chart;

[0088] The layered fracturing fracture extension simulation model simulates the fracturing process under different working conditions, so as to determine the combined relationship between fracture height and fracture length during the fracture extension process;

[0089] According to the combined relationship between crack height and crack length during crack propagation, a crack propagation criterion parameter chart is established.

[0090] In this embodiment, the specific implementation is to comprehensively analyze the influence of the minimum horizontal principal stress difference and the thickness of the barrier layer on the expansion of the fracturing crack, and establish the high expansion criterion of the target tight sandstone thick reservoir. The layered fracturing crack expansion simulation model simulates the fracturing process under different working conditions, so as to determine the combined relationship between the crack height and the crack length during the crack expansion process; Figure 5 As shown in the figure, the same layer area is where the hydraulic cracks extend through the low stress layer where the cracks start and the adjacent high stress barrier layer, and enter the next low stress layer. At this time, all the low stress layers and high stress barrier layers penetrated by the cracks are divided into one layer segment; the transition zone is where the hydraulic cracks extend through the low stress layer where the cracks start, enter the adjacent high stress barrier layer, stop extending after a certain height, and do not penetrate the high stress barrier layer. At this time, the hydraulic layer segment is divided based on the longitudinal depth point where the crack stops extending; the stratified area refers to where the hydraulic cracks extend inside the low stress layer and do not extend into the high stress layer. At this time, if the cracks can cover the entire low stress layer segment, the interface between the low stress layer and the high stress barrier layer is used as the boundary to divide the hydraulic layer segment. If the thickness of the low stress layer exceeds 60m and the hydraulic cracks cannot cover the entire low stress layer segment, the hydraulic layer segment is further subdivided based on the crack extension.

[0091] S105: According to the hydraulic fracturing crack extension criterion plate, the fracturing crack extension is simulated, the layer segments with fracture height extension are subdivided and merged, the number of layers and layer thickness of the dense thick sandstone fracturing division are determined, the final layer segment division result is determined, and the geological engineering integrated fracturing layer segment division is completed.

[0092] According to the hydraulic fracturing fracture extension criterion chart, combined with the hydraulic fracturing fracture extension simulation, the layer sections that are difficult to be completely covered by the fracture height are further subdivided;

[0093] The small layers where the fracture height crosses multiple layers are subdivided and merged. Based on the concept of geological engineering integration, the number and thickness of dense thick sandstone fracturing layers are obtained, the final division results are determined, and the geological engineering integrated fracturing layer division is completed.

[0094] like Figure 6 , Figure 7 , Figure 8As shown, in this embodiment, based on the target block hydraulic fracture expansion criterion, combined with the hydraulic fracture expansion morphology simulation results, the small layers where the fracture height passes through multiple layers are merged to complete the geological engineering integrated hydraulic fracture segment division. Since the hydraulic fracture height can pass through the D1 and D2 layers, the D1 and D2 layers are merged to determine the final segment division result, as shown in Table 3.

[0095] Table 3 Division of geological engineering integrated fracturing layers

[0096] interval Depth range <![CDATA[S1]]> 2680m-2760m <![CDATA[S2]]> 2760m-2804m <![CDATA[S3]]> 2804m-2842m

[0097] Corresponding to the above-mentioned embodiments, the present application also provides a hydraulic fracturing layer segmentation device.

[0098] See also Fig. 9 , which is a structural block diagram of a hydraulic fracturing layer segment division device provided in this application. Fig. 9 As shown, it mainly includes the following modules.

[0099] Physical property parameter normalization processing module 901: used to collect the physical property parameter characteristics of the dense thick sandstone formation cycle and reservoir, the rock mechanical properties and parameter characteristics, and normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient;

[0100] Hydraulic fracturing layer rough division module 902: used to preliminarily divide the reservoir based on the processed dense thick sandstone formation cycle and reservoir physical parameter characteristics, adopt the principle of minimizing the number of layers, complete the geological layer segment division, and determine the rough division of hydraulic fracturing layers;

[0101] The engineering layer segment fine division module 903 is used to set the minimum horizontal principal stress difference, brittleness index difference and high stress layer identification criteria according to the collected dense thick sandstone rock mechanical parameters, merge the number of layers divided by the geological layer segment according to the minimum horizontal principal stress difference, brittleness index difference and high stress layer identification criteria, and determine the engineering layer segment fine division of the reservoir;

[0102] The fracture extension criterion parameter chart acquisition module 904 is used to establish a layered fracturing fracture extension simulation model according to the number of layers divided into the engineering layer sections, determine the combined relationship between the fracture height and the fracture length during the fracture extension process, and establish a hydraulic fracturing fracture extension criterion parameter chart;

[0103] The geological engineering integrated fracturing layer segment division module 905 is used to simulate the expansion of the hydraulic fracturing cracks according to the hydraulic fracturing crack expansion criterion chart, subdivide and merge the layer segments with fracture height expansion, determine the number of layer segments and layer segment thickness for the dense thick sandstone fracturing division, determine the final layer segment division result, and complete the geological engineering integrated fracturing layer segment division.

[0104] It should be pointed out that the specific contents involved in the embodiments of the present application can be found in the description of the above method embodiments, and for the sake of brevity, they will not be repeated here.

[0105] Corresponding to the above embodiment, an embodiment of the present application further provides an electronic device.

[0106] See also Fig.10 , is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Fig.10 As shown, the electronic device 1000 may include: a processor 1001, a memory 1002 and a communication unit 1003. These components communicate via one or more buses. Those skilled in the art may understand that the electronic device structure shown in the figure does not constitute a limitation on the embodiments of the present application. It may be a bus structure or a star structure, and may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently.

[0107] The communication unit 1003 is used to establish a communication channel so that the electronic device can communicate with other devices.

[0108] The processor 1001 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. It runs or executes software programs and / or modules stored in the memory 1002, and calls data stored in the memory to perform various functions of the electronic device and / or process data. The processor can be composed of an integrated circuit (IC), for example, it can be composed of a single packaged IC, or it can be composed of multiple packaged ICs with the same or different functions. For example, the processor 1001 can include only a central processing unit (CPU). In the embodiment of the present application, the CPU can be a single computing core or multiple computing cores.

[0109] The memory 1002 is used to store the execution instructions of the processor 1001. The memory 1002 can be implemented by any type of volatile or non-volatile storage device 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 memory, flash memory, magnetic disk or optical disk.

[0110] When the execution instructions in the memory 1002 are executed by the processor 1001 , the electronic device 1000 is enabled to execute part or all of the steps in the above method embodiment.

[0111] Corresponding to the above embodiment, the embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium may store a program, wherein when the program is running, the device where the computer-readable storage medium is located may be controlled to perform some or all of the steps in the above method embodiment. In a specific implementation, the computer-readable storage medium may be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM).

[0112] Corresponding to the above-mentioned embodiment, the embodiment of the present application further provides a computer program product, which includes executable instructions. When the executable instructions are executed on a computer, the computer executes some or all of the steps in the above-mentioned method embodiment.

[0113] In the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0114] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0115] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0116] In several embodiments provided in the present application, any function can be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0117] The above is only a specific implementation of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for dividing hydraulic fracturing layers, characterized in that: include: Collect the cycle and reservoir physical property parameter characteristics of dense thick sandstone formations, rock mechanical properties and parameter characteristics, normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient; Based on the processed dense thick sandstone formation cycles and reservoir physical property parameter characteristics, the reservoir is preliminarily divided according to the principle of minimizing the number of layers, the geological layer division is completed, and the rough division of hydraulic fracturing layers is determined; According to the collected dense thick sandstone rock mechanical parameters, the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria are set, and the number of layers divided by the geological layer segment is merged according to the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria to determine the fine division of the engineering layer segment of the reservoir; A layered fracturing fracture expansion simulation model is established according to the number of layers divided into the engineering layer sections, a combined relationship between fracture height and fracture length during fracture expansion is determined, and a hydraulic fracturing fracture expansion criterion parameter chart is established; According to the hydraulic fracturing crack extension criterion chart, the fracturing crack extension is simulated, the layer segments with fracture height extension are subdivided and merged, the number of layer segments and layer segment thickness for dense thick sandstone fracturing division are determined, the final layer segment division result is determined, and the geological engineering integrated fracturing layer segment division is completed.

2. The hydraulic fracturing layer segmentation method according to claim 1, characterized in that: The method collects the physical property parameter characteristics of the dense thick sandstone formation cycle and reservoir, the rock mechanical properties and parameter characteristics, normalizes the collected physical property parameters, establishes a physical property parameter set, and defines a physical property similarity coefficient, including: Use formula (1) to normalize individual physical property parameters; In the formula, R i,j is the i-th value of the j-th parameter, min{R 1,j ,R 2,j …R n,j } is the minimum value of all the values ​​of the jth parameter, max{R 1,j ,R 2,j …R n,j } is the maximum value of all values ​​of the jth parameter; Establish the geological property parameter set R: Define the physical property similarity coefficient X:

3. The hydraulic fracturing layer segmentation method according to claim 1, characterized in that: According to the collected dense thick sandstone rock mechanical parameters, the minimum horizontal principal stress difference, the brittle index difference and the high stress layer identification criteria are set, and the number of layers divided by the geological layer segment is merged according to the minimum horizontal principal stress difference, the brittle index difference and the high stress layer identification criteria to determine the fine division of the engineering layer segment of the reservoir, including: Based on the collected rock mechanical parameters of dense thick sandstone, the minimum horizontal principal stress, maximum horizontal principal stress, brittleness index, Young's modulus, Poisson's ratio, and fracture pressure rock mechanical parameters are determined, and the factor set S is established using formula (4): The rock mechanics parameters are determined based on logging data and geological information, the minimum horizontal principal stress difference is set, the number of layers divided into geological sections is merged, the number of layers for fine division of engineering sections is determined according to the principle of minimizing the number of layers, and the number of vertical layers of the geological model is determined at the same time.

4. The hydraulic fracturing layer segmentation method according to claim 1 or 2, characterized in that: The principle of minimizing the number of stratified layers is that if the geological layer division and the engineering layer division are consistent, they will remain unchanged, and if they are inconsistent, the layers will be merged into small layers to minimize the number of layers.

5. The hydraulic fracturing layer segmentation method according to claim 1, characterized in that: The method of establishing a layered fracturing crack expansion simulation model according to the number of layers divided into the engineering layer sections, determining the combined relationship between the crack height and the crack length during the crack expansion process, and establishing a hydraulic fracturing crack expansion criterion parameter chart includes: The layered fracturing fracture extension simulation model simulates the fracturing process under different working conditions, thereby determining the combined relationship between fracture height and fracture length during the fracture extension process; According to the combined relationship between crack height and crack length during crack propagation, a crack propagation criterion parameter chart is established.

6. The hydraulic fracturing layer segmentation method according to claim 1 or 2, characterized in that: According to the hydraulic fracturing crack extension criterion chart, the fracturing crack extension is simulated, the layer sections with fracture height extension are subdivided and merged, the number of layers and layer thickness of dense thick sandstone fracturing division are determined, the final layer division result is determined, and the geological engineering integrated fracturing layer division is completed, including: According to the hydraulic fracturing fracture extension criterion chart, combined with the hydraulic fracturing fracture extension simulation, the layer sections that are difficult to be completely covered by the fracture height are further subdivided; The small layers where the fracture height crosses multiple layers are subdivided and merged. Based on the concept of geological engineering integration, the number and thickness of dense thick sandstone fracturing layers are obtained, the final division results are determined, and the geological engineering integrated fracturing layer division is completed.

7. A hydraulic fracturing layer segmentation device, characterized in that: include: Physical property parameter normalization processing module: used to collect the physical property parameter characteristics of dense thick sandstone formation cycles and reservoirs, rock mechanical properties and parameter characteristics, and normalize the collected physical property parameters, establish a physical property parameter set, and define the physical property similarity coefficient; Hydraulic fracturing layer rough division module: It is used to preliminarily divide the reservoir based on the processed dense thick sandstone formation cycle and reservoir physical parameter characteristics, adopt the principle of minimizing the number of layers, complete the geological layer segment division, and determine the rough division of hydraulic fracturing layers; Engineering layer fine division module: used to set the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria according to the collected dense thick sandstone rock mechanical parameters, merge the number of layers divided by the geological layer according to the minimum horizontal principal stress difference, brittle index difference and high stress layer identification criteria, and determine the fine division of the engineering layer of the reservoir; A fracture extension criterion parameter chart acquisition module is used to establish a layered fracturing fracture extension simulation model according to the number of layers divided into the engineering layer sections, determine the combined relationship between fracture height and fracture length during fracture extension, and establish a hydraulic fracturing fracture extension criterion parameter chart; The geological engineering integrated fracturing layer segment division module is used to simulate the expansion of the hydraulic fracturing cracks according to the hydraulic fracturing crack expansion criterion chart, subdivide and merge the layer segments with fracture height expansion, determine the number of layer segments and layer segment thickness for the dense thick sandstone fracturing division, determine the final layer segment division results, and complete the geological engineering integrated fracturing layer segment division.

8. An electronic device, characterized in that: include: processor; Memory; And a computer program, wherein the computer program is stored in the memory, and the computer program includes instructions, and when the instructions are executed by the processor, the electronic device executes the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: Comprising a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located executes the method according to any one of claims 1 to 6.

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