Shale oil and gas fracturing difficulty evaluation method and device and electronic equipment

Abstract

The application relates to the field of evaluation of fracturing effect of unconventional oil and gas reservoirs, and discloses a shale oil and gas fracturing difficulty evaluation method, a device and electronic equipment. The method comprises the following steps: determining support agent conversion sand volume and fracturing fluid conversion liquid volume; determining total support agent conversion sand volume of all types and total fracturing fluid conversion liquid volume of all types, and determining sand carrying efficiency according to the total support agent conversion sand volume and the total fracturing fluid conversion liquid volume; determining a construction pressure window according to preset fracturing construction data; performing normalization processing on the sand carrying efficiency and the construction pressure window of each section respectively to obtain a normalized result of the sand carrying efficiency and a normalized result of the construction pressure window; and determining a fracturing difficulty index for evaluating fracturing difficulty according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window. The method comprehensively considers the influences of multiple parameters such as construction pressure, fracturing material parameters and comprehensive sand-liquid ratio, and provides an effective technical means for post-fracturing analysis and evaluation of fracturing geological environmental factors.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of evaluating the fracturing effect of unconventional oil and gas reservoirs, and in particular to a shale oil and gas fracturing difficulty evaluation method and device, a storage medium and an electronic device. BACKGROUND

[0002] How to determine the influence mechanism of fracturing geological environmental factors on fracturing difficulty and improve the pertinence of fracturing design has become a problem to be solved in shale development.

[0003] At present, researchers quantitatively evaluate fracturing difficulty by using single indicators such as comprehensive sand-liquid ratio and sand volume, so as to study the control mechanism of fracturing difficulty in combination with geological data. Although the indicators can quantitatively reflect the sanding difficulty of shale gas wells to some extent; on the one hand, the indicators do not consider the influence of the operating pressure window, and cannot reflect the influence of the closure pressure, natural fracture development and other changes on the fracturing difficulty; on the other hand, the indicators do not consider the influence of viscosity, support agent particle size combination and other process parameters on the sanding difficulty.

[0004] Therefore, under the current circumstances, the above construction parameters have certain limitations in evaluating the fracturing difficulty of shale gas and oil wells. SUMMARY

[0005] In view of the above problems, the present application provides a shale oil and gas fracturing difficulty evaluation method, device, storage medium and electronic device. By establishing a calculation method of a fracturing difficulty index which comprehensively considers the influence of construction pressure, fracturing material parameters, comprehensive sand-liquid ratio and other parameters, an effective technical means is provided for studying the influence mechanism of fracturing geological environmental factors on fracturing difficulty.

[0006] The first aspect of the present application provides a shale oil and gas fracturing difficulty evaluation method, which comprises:

[0007] determining equivalent proppants and determining the proppant converted sand volume according to the equivalent proppants and preset fracturing construction data;

[0008] determining the fracturing fluid converted fluid volume according to the preset equivalent viscosity and the preset fracturing construction data;

[0009] determining the total sand volume of all types of proppants and the total fluid volume of all types of fracturing fluids, and determining the sand carrying efficiency according to the total sand volume of the proppants and the total fluid volume of the fracturing fluids;

[0010] determining the operating pressure window according to the preset fracturing construction data;

[0011] normalizing the sand carrying efficiency and the operating pressure window of each section respectively to obtain the normalized results of the sand carrying efficiency and the operating pressure window corresponding thereto;

[0012] According to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window, a fracturing difficulty index for evaluating fracturing difficulty is determined.

[0013] Further, the preset fracturing construction data includes:

[0014] The sand volume of the proppant, the bulk density of the proppant, the average value of the proppant particle size, the liquid volume of the fracturing fluid, the fracturing construction pressure, the fracturing sand ratio, and the viscosity of the fracturing fluid.

[0015] Further, the equivalent sand volume of the proppant is determined by the following formula:

[0016]

[0017] wherein, is the equivalent sand volume of the i-th type of proppant; i is the sand volume of the i-th type of proppant; is the bulk density of the i-th type of proppant; i is the bulk density of the i-th type of proppant; is the average value of the i-th type of proppant particle size; i is the average value of the i-th type of proppant particle size; is the equivalent bulk density of the proppant; is the average value of the i-th type of proppant particle size; is the average value of the i-th type of proppant particle size.

[0018] Further, the equivalent liquid volume of the fracturing fluid is determined by the following formula:

[0019]

[0020] wherein, is the equivalent liquid volume of the i-th type of fracturing fluid; i is the liquid volume of the i-th type of fracturing fluid; is the liquid volume of the i-th type of fracturing fluid; i is the viscosity of the i-th type of fracturing fluid; is the preset equivalent viscosity. i Further, the sand carrying efficiency is determined according to the equivalent sand volume of the proppant and the equivalent liquid volume of the fracturing fluid, comprising:

[0021] According to the equivalent sand volume of each type of proppant, a total equivalent sand volume is determined;

[0022] According to the equivalent liquid volume of each type of fracturing fluid, a total equivalent liquid volume is determined;

[0023] According to the total equivalent sand volume and the total equivalent liquid volume, the sand carrying efficiency is determined.

[0024] According to the total equivalent sand volume and the total equivalent liquid volume, the sand carrying efficiency is determined.

[0025] ​Further, the step of determining the fracturing pressure window comprises:

[0026] determining the wellhead pressure corresponding to the cumulative sand production at the bottom hole according to the preset fracturing operation data, and determining the average fracturing pressure according to the wellhead pressure at different time points;

[0027] determining the fracturing pressure window according to the preset wellhead pressure limit and the average fracturing pressure.

[0028] Further, the fracturing difficulty index is determined by the following formula:

[0029]

[0030] wherein, FI is the fracturing difficulty index, is the normalized result of the sand carrying efficiency, is the normalized result of the fracturing pressure window.

[0031] The second aspect of the present application provides a shale oil and gas fracturing difficulty evaluation device, the device comprising:

[0032] a proppant converted sand volume determination module for determining equivalent proppant and determining the proppant converted sand volume according to the equivalent proppant and the preset fracturing operation data;

[0033] a fracturing fluid converted fluid volume determination module for determining the fracturing fluid converted fluid volume according to the preset equivalent viscosity and the preset fracturing operation data;

[0034] a sand carrying efficiency determination module for determining the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted fluid volume;

[0035] a fracturing pressure window determination module for determining the fracturing pressure window according to the preset fracturing operation data;

[0036] a normalization processing module for normalizing the sand carrying efficiency and the fracturing pressure window of each section respectively to obtain the normalized result of the sand carrying efficiency and the normalized result of the fracturing pressure window;

[0037] a fracturing difficulty index determination module for determining the fracturing difficulty index for evaluating the fracturing difficulty according to the normalized result of the sand carrying efficiency and the normalized result of the fracturing pressure window.

[0038] The third aspect of the present application provides a computer readable storage medium storing a computer program which can be executed by one or more processors to implement the steps of the method as described above.

[0039] In a fourth aspect, the present application provides an electronic device comprising a memory and one or more processors, wherein the memory stores a computer program, and the memory and the one or more processors are communicatively connected, and the computer program is executed by the one or more processors to implement the steps of the method described above.

[0040] Compared with the prior art, the technical scheme of the present application has the advantages or beneficial effects including:

[0041] The present application discloses a shale oil and gas fracturing difficulty evaluation method, which comprehensively considers the influences of construction pressure, fracturing material parameters, and comprehensive sand-liquid ratio, and provides an effective technical means for post-fracturing analysis and fracturing geological environment factor evaluation. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0043] In addition, it should be further pointed out that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings. The drawings accompanying the specification form part of the present application and serve to provide a further understanding of the present application. The schematic embodiments and their descriptions in the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0044] Figure 1 A flowchart of a shale oil and gas fracturing difficulty evaluation method provided by an embodiment of the present application is shown in the following figure:

[0045] Figure 2 A flowchart of another shale oil and gas fracturing difficulty evaluation method provided by an embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be described in detail below with reference to the drawings and embodiments, so that how the present application applies technical means to solve technical problems and achieves corresponding technical effects can be fully understood and implemented. The embodiments of the present application and each feature in the embodiments can be combined with each other without conflict, and the technical scheme formed thereby is within the protection scope of the present application.

[0047] It should be noted that the embodiments described below are merely some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0048] Embodiment one

[0049] The present embodiment provides a shale oil and gas fracturing difficulty evaluation method, Figure 1 The flow chart of the shale oil and gas fracturing difficulty evaluation method provided by the present embodiment is shown in Figure 1 The method disclosed by the present embodiment comprises the following steps:

[0050] Step 110, determining equivalent proppant and determining proppant conversion sand volume according to the equivalent proppant and preset fracturing construction data.

[0051] As an example, the preset fracturing construction data comprises:

[0052] The sand volume of the proppant, the bulk density of the proppant, the average value of the proppant particle size, the liquid volume of the fracturing fluid, the fracturing construction pressure, the fracturing sand ratio, and the fracturing fluid viscosity.

[0053] Optionally, the preset fracturing construction data collected can comprise proppant experimental evaluation results, fracturing construction pressure, fracturing sand ratio, fracturing fluid viscosity, and fracturing fluid proppant parameters.

[0054] As an example, when determining the equivalent proppant, the following processing mode can be adopted:

[0055] Considering that shale gas fracturing usually adopts 70 / 140 mesh, 40 / 70 mesh, 30 / 50 mesh, and 20 / 40 mesh proppants for pumping construction at present, considering that the single sand volume cannot reflect the process difficulty difference due to the different types of proppants entering the formation, the bulk density and particle size of the proppant are comprehensively considered, and the use amount of the equivalent 40 / 70 mesh low-density ceramic proppant is recommended.

[0056] As an example, the proppant conversion sand volume is determined by the following formula:

[0057]

[0058] wherein, is the conversion sand volume of the first type of proppant; i is the sand volume of the first type of proppant; is the bulk density of the first type of proppant; i is the conversion sand volume of the second type of proppant; is the sand volume of the second type of proppant; i is the bulk density of the second type of proppant; is the bulk density of the equivalent proppant; is the average particle size of the i-th type proppant; is the average value of equivalent proppant particle size.

[0059] Step 120: Determine the converted volume of the fracturing fluid according to the preset equivalent viscosity and the preset fracturing construction data.

[0060] Alternatively, considering that shale gas well fracturing currently typically uses glue and slick water for fracturing construction, it is recommended to uniformly use the viscosity as the equivalent of clean water, that is, the preset equivalent viscosity can be the viscosity of clean water.

[0061] As an example, the converted volume of the fracturing fluid is determined by the following formula:

[0062]

[0063] in, For the i Converted fluid volume of similar fracturing fluid; For the i The volume of fracturing fluid; For the i Viscosity of fracturing fluid; is the preset equivalent viscosity.

[0064] Step 130: Determine the total sand volume converted from all types of proppants and the total liquid volume converted from all types of fracturing fluids, and determine the sand carrying efficiency based on the total sand volume converted from the proppants and the total liquid volume converted from the fracturing fluids.

[0065] As an example, determining the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume includes:

[0066] Determine the total converted sand volume based on the converted sand volume of each type of proppant;

[0067] Determine the total converted fluid volume based on the converted fracturing fluid volume of each type of fracturing fluid;

[0068] The sand carrying efficiency is determined according to the total converted sand volume and the total converted liquid volume.

[0069] Step 140: Determine the construction pressure window according to preset fracturing construction data.

[0070] As an example, the step of determining the construction pressure window includes:

[0071] Determine the wellhead pressure corresponding to the cumulative sand injection volume at the bottom of the well according to the preset fracturing operation data, and determine the average operation pressure according to the wellhead pressure at different times;

[0072] The operation pressure window is determined according to a preset wellhead pressure limit and the average operation pressure.

[0073] Step 150: Normalize the sand carrying efficiency and construction pressure window of each section respectively to obtain the corresponding normalized results of the sand carrying efficiency and the normalized results of the construction pressure window.

[0074] Step 160: Determine a fracturing difficulty index for evaluating fracturing difficulty based on the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

[0075] As an example, the fracturing difficulty index is determined by the following formula:

[0076]

[0077] in, FI is the fracturing difficulty index, is the normalized result of sand carrying efficiency, is the normalized result of the construction pressure window.

[0078] Example 2

[0079] Based on the first embodiment, this embodiment further explains and illustrates the shale oil and gas fracturing difficulty evaluation method disclosed in the first embodiment in an illustrative manner.

[0080] As another example, the proppant-converted sand amount is determined by the following formula:

[0081]

[0082] in, For the i Equivalent sand volume of proppant-like material, unit is m 3 ; For the i The amount of sand as proppant, in m 3 ; For the i Bulk density of the proppant, in kg / m 3 ; is the volume density of low-density ceramsite, in kg / m 3 , the recommended value is 1650kg / m 3 ; is the average particle size of the i-th type proppant, in μm; It is the average particle size of 40 / 70 mesh proppant, in μm, and the recommended value is 340 μm.

[0083] It should be noted that, according to actual needs, the equivalent proppant may also be determined as proppant of other particle sizes or types.

[0084] As another example, the preset equivalent viscosity is unified as the viscosity of clear water, and the converted fluid volume of the fracturing fluid is determined by the following formula:

[0085]

[0086] wherein, is the converted fluid volume of the fracturing fluid of the first type, in m 3 ; i is the fluid volume of the fracturing fluid of the first type, in m 3 ; is the viscosity of the fracturing fluid of the first type, in mPa·s; i is the viscosity of the fracturing fluid of the first type, in mPa·s; i is the viscosity of clear water, in mPa·s, and generally its value can be taken as 1.

[0087] It should be noted that, according to actual needs, the preset equivalent viscosity can also be unified as the viscosity of slickwater or other types of fracturing fluids.

[0088] As an example, in step 130, the converted total sand volume of the proppant, the converted total fluid volume of the fracturing fluid, and the sand-carrying efficiency can be determined by the following ways:

[0089]

[0090] In the formula, is the converted total fluid volume of the fracturing fluid, in m 3 ; n is the number of types of the fracturing fluid;

[0091]

[0092] In the formula, is the converted total sand volume of the proppant, in m 3 ; n is the number of types of the proppant;

[0093] Further, the converted total sand volume carried by the converted total fluid volume per unit volume is used to represent the sand-carrying efficiency of the fracturing fluid in this section, i.e.:

[0094]

[0095] In the formula, R is the sand-carrying efficiency, dimensionless.

[0096] ​​As an example, in step 140, according to the construction experience, when the sand enters the formation, if the jointing is difficult, the joint width is narrow, the sanding is difficult, and the construction pressure is easy to increase, the complex situation of narrow construction pressure window is prone to occur. In view of this, the average construction pressure window of the sand entering the formation is used to represent the fracturing difficulty. Considering that the current field construction record data are mainly the data of wellhead proppant sand ratio and liquid injection amount, the following processing is needed for these data:

[0097]

[0098] In the formula, is the construction pressure when the well bottom cumulative sanding amount is , and the unit is MPa; is the wellhead cumulative liquid injection amount when the wellhead cumulative sanding amount is , and the unit is m 3 ; is the wellbore volume, and the unit is m 3 ; is the construction pressure when the wellhead cumulative liquid amount is , and the unit is MPa.

[0099] Further, according to the wellhead pressure when the sand-carrying liquid enters the formation at different times, the average construction pressure during the sanding period is calculated by the following formula:

[0100]

[0101] In the formula, is the average construction pressure during the sanding period, and the unit is MPa; is the wellhead pressure at time t i , and the unit is MPa; is the construction pressure recording interval time, and the unit is second; is the cumulative time length of the sand entering the formation, and the unit is second. t Finally, in combination with the preset wellhead pressure limit (which can be the surface equipment pressure limit), the construction pressure window is calculated by the following formula:

[0102]

[0103]

[0104] In the formula, is the construction pressure window, and the unit is MPa; is the surface equipment pressure limit, and the unit is MPa.

[0105] As an example, in step 150, when a single well is taken as the analysis object, the sand-carrying efficiency of each section and the construction pressure window when the sand enters the formation need to be normalized, and specifically: ​

[0106]

[0107]

[0108] In the formula, R i is the normalized result of the sand-carrying efficiency, dimensionless; i is the normalized result of the sand-carrying efficiency, dimensionless; is the normalized result of the sand-carrying efficiency, dimensionless; is the normalized result of the sand-carrying efficiency, dimensionless; is the normalized result of the sand-carrying efficiency, dimensionless; i is the normalized result of the sand-carrying efficiency, dimensionless;

[0109] As an example, finally in step 160, according to the normalized result of the sand-carrying efficiency and the normalized result of the construction pressure window, the fracturing difficulty index is determined, specifically:

[0110]

[0111] In the formula, FI is the fracturing difficulty index, dimensionless.

[0112] In addition, in order to facilitate the understanding of the technical scheme of the present application, reference can also be made to Figure 2 .

[0113] In summary, the embodiment discloses a shale oil and gas fracturing difficulty evaluation method, which comprehensively considers the influences of construction pressure, fracturing material parameters, and comprehensive sand-liquid ratio and the like, and provides an effective technical means for post-fracturing analysis and fracturing geological environment factor evaluation.

[0114] Embodiment three

[0115] This embodiment is based on the foregoing embodiment, and takes a shale gas well in the southwestern Sichuan region as an example to further explain and illustrate the shale oil and gas fracturing difficulty evaluation method disclosed in the present application.

[0116] Specifically, the vertical depth of the shale gas well in the southwestern Sichuan region is 3931.00 m, and the measured depth is 5560.00 m. The fracturing difficulty index is determined according to the following processing flow:

[0117] (1) Determine the sand-carrying efficiency:

[0118] The well uses three kinds of fluids, i.e., low-viscosity slickwater, high-viscosity slickwater, and gel, wherein the low-viscosity slickwater is 3 mPa·s, the high-viscosity slickwater is 15 mPa·s, and the gel is 60 mPa·s. The converted fluid volume is shown in Table 1.

[0119] Table 1: Calculation results of converted fluid volume

[0120]

[0121] Two types of proppant, 70 / 140 mesh quartz sand and 40 / 70 mesh ceramsite, were used in the well. The converted sand amount is shown in Table 2 according to the density and average particle size of the evaluation experiment.

[0122] Table 2 Calculation results of converted sand amount

[0123]

[0124] On this basis, the sand-carrying efficiency of each section is further calculated.

[0125] The sand-carrying efficiency can be referred to Table 3.

[0126] Table 3 Calculation results of sand-carrying efficiency

[0127]

[0128] (2) Determine the construction pressure window:

[0129] The well is limited to 112 MPa, and the calculation results of the construction pressure window of the sand into the formation are shown in Table 4.

[0130] Table 4 Calculation of construction pressure window

[0131]

[0132] (3) Determine the fracturing difficulty index:

[0133] After the normalization processing of the sand-carrying efficiency and the construction pressure window, the fracturing difficulty index is further determined according to the normalization processing results.

[0134] The calculation results of the fracturing difficulty index can be referred to Table 5.

[0135] Table 5 Calculation method of fracturing difficulty index

[0136]

[0137] Further, the shale oil and gas fracturing difficulty is evaluated according to the determined fracturing difficulty index.

[0138] Example Four

[0139] The embodiment provides a shale oil and gas fracturing difficulty evaluation device. The device embodiment can be used to execute the method embodiments of the application. For details not disclosed in the device embodiment, please refer to the method embodiments of the application. The device disclosed in the embodiment comprises:

[0140] The proppant converted sand amount determination module is used to determine the equivalent proppant and determine the proppant converted sand amount according to the equivalent proppant and the preset fracturing construction data.

[0141] A fracturing fluid conversion volume determination module, configured to determine the fracturing fluid conversion volume based on a preset equivalent viscosity and the preset fracturing construction data;

[0142] A sand carrying efficiency determination module is used to determine the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume;

[0143] A construction pressure window determination module is used to determine the construction pressure window according to preset fracturing construction data;

[0144] A normalization processing module is used to perform normalization processing on the sand carrying efficiency and construction pressure window of each section respectively, and obtain the corresponding normalized results of the sand carrying efficiency and the normalized results of the construction pressure window;

[0145] The fracturing difficulty index determination module is used to determine a fracturing difficulty index for evaluating the difficulty of fracturing according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

[0146] In some embodiments, the preset fracturing construction data includes:

[0147] The sand content of the proppant, the bulk density of the proppant, the average particle size of the proppant, the liquid volume of the fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the fracturing fluid viscosity.

[0148] In some embodiments, the proppant converted sand amount is determined by the following formula:

[0149]

[0150] in, For the i Converted sand volume of proppant-like material; For the i The amount of sand in the proppant-like form; For the i Bulk density of proppant-like material; is the bulk density of the equivalent proppant; is the average particle size of the i-th type proppant; is the average value constant of the equivalent proppant particle size.

[0151] In some embodiments, the converted fluid volume of the fracturing fluid is determined by the following formula:

[0152]

[0153] in, For the i Converted fluid volume of similar fracturing fluid; For the i The volume of fracturing fluid; For thei viscosity of the fracturing fluid; is a preset equivalent viscosity.

[0154] In some embodiments, the sand-carrying efficiency determining module comprises a total converted sand amount determining unit, a total converted fluid amount determining unit and a sand-carrying efficiency determining unit, wherein,

[0155] The total converted sand amount determining unit is configured to determine the total converted sand amount according to the converted sand amount of each type of proppant.

[0156] The total converted fluid amount determining unit is configured to determine the total converted fluid amount according to the converted fluid amount of each type of fracturing fluid.

[0157] The sand-carrying efficiency determining unit is configured to determine the sand-carrying efficiency according to the total converted sand amount and the total converted fluid amount.

[0158] In some embodiments, the operation pressure window determining module comprises an average operation pressure determining unit and an operation pressure window determining unit, wherein,

[0159] The average operation pressure determining unit is configured to determine the average operation pressure according to the wellhead pressure corresponding to the cumulative sand amount at the bottom hole determined according to the preset fracturing operation data, and according to the wellhead pressure at different time points.

[0160] The operation pressure window determining unit is configured to determine the operation pressure window according to the preset wellhead pressure limit and the average operation pressure.

[0161] In some embodiments, the fracturing difficulty index is determined by the following formula:

[0162]

[0163] wherein, FI is the fracturing difficulty index, is a normalized result of the sand-carrying efficiency, is a normalized result of the operation pressure window.

[0164] Those skilled in the art can understand that the structure shown in the embodiments does not constitute a limitation on the device of the present application, and can include more or fewer modules / cells than the illustrated ones, or combine certain modules / cells, or arrange different modules / cells.

[0165] Those skilled in the art should understand that the modules or steps of the present application described above can be realized by a general computing device, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices. Alternatively, they can be realized by program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described can be executed in different order, or they can be made into individual integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module.

[0166] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of each module / unit in the shale oil and gas fracturing difficulty evaluation device can refer to the corresponding process in the foregoing method embodiments, and this embodiment will not be repeated here.

[0167] Embodiment Five

[0168] The embodiment provides a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the method steps in the foregoing method embodiments, and the embodiment will not be repeated here.

[0169] The computer readable storage medium can also include a computer program, a data file, a data structure, or a combination thereof. The computer readable storage medium or the computer program can be specifically designed and understood by those skilled in the computer software field, or it can be known and available to those skilled in the computer software field. Examples of the computer readable storage medium include: magnetic media, such as hard disks, floppy disks, and magnetic tapes; optical media, such as CD ROM disks and DVDs; magneto-optical media, such as optical disks; and hardware devices specifically configured to store and execute computer programs, such as read-only memory (ROM), random access memory (RAM), flash memory; or servers, app application stores, and the like. Examples of the computer program include machine code (e.g., code generated by a compiler) and files containing high-level code, which can be executed by a computer by using an interpreter. The described hardware devices can be configured to function as one or more software modules to perform the above-described operations and methods, and vice versa. In addition, the computer readable storage medium can be distributed in a networked computer system, and the program code or computer program can be stored and executed in a distributed manner.

[0170] Embodiment Six

[0171] The embodiment provides a computer program product. The computer program product includes a computer program or instructions which, when executed by a processor, implement all or part of the steps of the method in the foregoing method embodiment, and the embodiment is not repeated here.

[0172] Further, the computer program product can include one or more computer executable components configured to perform embodiments when the program is run; the computer program product can also include a computer program tangibly embodied on a non-transitory computer readable medium, the computer program including program code for performing any of the methods of the present embodiments. In such an embodiment, the computer program can be downloaded from a network and installed, and / or installed from a removable medium.

[0173] Embodiment seven

[0174] The embodiment provides an electronic device, which can include one or more processors, a memory, a multimedia component, an input / output (I / O) interface, and a communication component.

[0175] The one or more processors are configured to perform all or part of the steps in the foregoing method embodiments. The memory 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-related data.

[0176] The one or more processors 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 are configured to perform the method in the foregoing method embodiments.

[0177] The memory 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.

[0178] The multimedia component 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.

[0179] The I / O interface provides an interface between the one or more processors and other interface modules, which can be a keyboard, a mouse, a button, etc. These buttons can be virtual buttons or physical buttons.

[0180] The communication component is used for wired or wireless communication between the electronic device and other devices. Wired communication includes communication through a network port, a serial port, etc.; wireless communication includes Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G, 4G, 5G, or a combination of one or more of them.

[0181] In addition, it should be understood that the methods or devices disclosed in the embodiments provided in this application may also be implemented in other ways. The method or device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the methods and devices according to the various embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a computer program segment, or a portion of a computer program, which contains one or more computer programs for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes may occur in an order different from that marked in the drawings, and may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, may be implemented using a dedicated hardware-based system that performs the specified functions or actions, or may be implemented using a combination of dedicated hardware and computer programs.

[0182] In this application, the terms "comprise", "contain", or any other variant thereof are intended to cover a non-exclusive inclusion, so that processes, methods, articles, or devices that comprise a list of elements do not only include those elements, but also include other elements that are not expressly listed, or further include elements inherent in such processes, methods, articles, or devices. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, device or equipment comprising the element; if there is a description of "first", "second", etc., it is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features; in the description of the present application, unless otherwise specified, the meaning of the term "a plurality of" or "a plurality" is at least two; if there is a description of a server, it should be noted that the server can be a stand-alone physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server capable of providing cloud server, cloud database, cloud storage and CDN and other basic cloud computing services; if there is a description of intelligent terminal or mobile device in the present application, it should be noted that the intelligent terminal or mobile device can be a mobile phone, tablet computer, smart watch, netbook, wearable electronic device, personal digital assistant (PDA), augmented reality technology device (AR), virtual reality device (VR), smart television, smart sound, personal computer (PC) and the like, but is not limited thereto, and the specific form of the intelligent terminal or mobile device is not specially limited in the present application.

[0183] Finally, it should be noted that in the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "one example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0184] Although the embodiments of the present application have been shown and described above, it is understood that all the above-described embodiments are exemplary only, the contents described are merely adopted for the purpose of facilitating the understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which the present application belongs can make any modification and change in the form and details without departing from the spirit and scope of the present application, but the protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A method for evaluating the difficulty of shale oil and gas fracturing, characterized in that: The method comprises: Determine an equivalent proppant and determine the proppant-converted sand amount based on the equivalent proppant and preset fracturing construction data; wherein the preset fracturing construction data includes: the sand amount of the proppant, the bulk density of the proppant, the average proppant particle size, the liquid volume of the fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the fracturing fluid viscosity; the proppant-converted sand amount is determined by the following formula: in, For the i Converted sand volume of proppant-like material; For the i The amount of sand in the proppant-like form; For the i Bulk density of proppant-like material; is the bulk density of the equivalent proppant; is the average particle size of the i-th type proppant; is the average value of equivalent proppant particle size; The converted amount of the fracturing fluid is determined according to the preset equivalent viscosity and the preset fracturing construction data; wherein the converted amount of the fracturing fluid is determined by the following formula: in, For the i Converted fluid volume of similar fracturing fluid; For the i The volume of fracturing fluid; For the i Viscosity of fracturing fluid; is the preset equivalent viscosity; Determining the total sand volume converted from all types of proppants and the total liquid volume converted from all types of fracturing fluids, and determining the sand carrying efficiency based on the total sand volume converted from the proppants and the total liquid volume converted from the fracturing fluids; Determine the construction pressure window based on preset fracturing construction data; Normalize the sand carrying efficiency and construction pressure window of each section respectively to obtain the corresponding normalized results of sand carrying efficiency and construction pressure window; A fracturing difficulty index for evaluating fracturing difficulty is determined according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

2. The shale oil and gas fracturing difficulty evaluation method according to claim 1, characterized in that: The step of determining the construction pressure window includes: Determine the wellhead pressure corresponding to the cumulative sand injection volume at the bottom of the well according to the preset fracturing operation data, and determine the average operation pressure according to the wellhead pressure at different times; The operation pressure window is determined according to a preset wellhead pressure limit and the average operation pressure.

3. The shale oil and gas fracturing difficulty evaluation method according to claim 1, characterized in that: The fracturing difficulty index is determined by the following formula: in, FI is the fracturing difficulty index, is the normalized result of sand carrying efficiency, is the normalized result of the construction pressure window.

4. A shale oil and gas fracturing difficulty evaluation device, characterized in that: include: A proppant conversion sand quantity determination module is used to determine an equivalent proppant and determine the proppant conversion sand quantity based on the equivalent proppant and preset fracturing construction data; The preset fracturing construction data includes: the amount of proppant sand, the bulk density of the proppant, the average proppant particle size, the amount of fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the fracturing fluid viscosity; the proppant converted sand amount is determined by the following formula: in, For the i Converted sand volume of proppant-like material; For the i The amount of sand in the proppant-like form; For the i Bulk density of proppant-like material; is the bulk density of the equivalent proppant; is the average particle size of the i-th type proppant; is the average value of equivalent proppant particle size; The fracturing fluid conversion liquid volume determination module is used to determine the fracturing fluid conversion liquid volume according to the preset equivalent viscosity and the preset fracturing construction data; wherein the fracturing fluid conversion liquid volume is determined by the following formula: in, For the i Converted fluid volume of similar fracturing fluid; For the i The volume of fracturing fluid; For the i Viscosity of fracturing fluid; is the preset equivalent viscosity; A sand carrying efficiency determination module is used to determine the total sand volume converted from all types of proppants and the total liquid volume converted from all types of fracturing fluids, and to determine the sand carrying efficiency based on the total sand volume converted from the proppants and the total liquid volume converted from the fracturing fluids; A construction pressure window determination module is used to determine the construction pressure window according to preset fracturing construction data; A normalization processing module is used to perform normalization processing on the sand carrying efficiency and construction pressure window of each section respectively, and obtain the corresponding normalized results of the sand carrying efficiency and the normalized results of the construction pressure window; The fracturing difficulty index determination module is used to determine a fracturing difficulty index for evaluating the difficulty of fracturing according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

5. A computer-readable storage medium, characterized in that The computer program stored in the computer-readable storage medium, when executed by one or more processors, implements the shale oil and gas fracturing difficulty evaluation method according to any one of claims 1 to 3.

6. 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 method for evaluating the difficulty of shale oil and gas fracturing as claimed in any one of claims 1 to 3 is implemented.

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