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

Abstract

The invention relates to the field of fracturing effect evaluation of unconventional oil and gas reservoirs, and discloses a shale oil and gas fracturing difficulty evaluation method and device and electronic equipment. The method comprises the steps that the converted sand amount of a propping agent and the converted liquid amount of fracturing liquid are determined; all types of proppant converted total sand amount and all types of fracturing fluid converted total liquid amount are determined, and the sand carrying efficiency is determined according to the proppant converted total sand amount and the fracturing fluid converted total liquid amount; 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 to obtain a normalization result of the sand-carrying efficiency and a normalization result of the construction pressure window; and according to the normalization result of the sand-carrying efficiency and the normalization result of the construction pressure window, determining a fracturing difficulty index for evaluating the fracturing difficulty. The influence of multiple parameters such as construction pressure, fracturing material parameters and the comprehensive sand-liquid ratio is comprehensively considered, and an effective technical means is provided for post-fracturing analysis and fracturing geological environment factor evaluation.

Description

Technical Field

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

[0004] How to clarify the impact mechanism of fracturing geological environment factors on fracturing difficulty and improve the targetedness of fracturing design has become an urgent problem to be solved in shale development.

[0005] At present, researchers mostly use single indicators such as comprehensive sand-to-liquid ratio and sand addition amount to quantitatively evaluate the difficulty of fracturing, and then combine geological data to study the control mechanism of fracturing difficulty. Although this indicator can quantitatively reflect the difficulty of adding sand to shale gas wells to a certain extent; however, on the one hand, this indicator does not consider the impact of the construction pressure window, and cannot reflect the impact of changes in closing pressure, natural fracture development, etc. on the difficulty of fracturing; on the other hand, this indicator does not consider the impact of changes in process parameters such as viscosity and proppant particle size combination on the difficulty of adding sand.

[0006] Therefore, under the current circumstances, the above construction parameters have certain limitations in evaluating the difficulty of fracturing shale gas wells. Summary of the invention

[0007] In response to the above problems, this application proposes a shale oil and gas fracturing difficulty evaluation method, device, storage medium and electronic equipment. By establishing a calculation method for the fracturing difficulty index that comprehensively considers the influence of multiple parameters such as construction pressure, fracturing material parameters, and comprehensive sand-liquid ratio, it provides an effective technical means for studying the influence mechanism of fracturing geological environment factors on fracturing difficulty.

[0008] In a first aspect of the present application, a method for evaluating the difficulty of shale oil and gas fracturing is provided, the method comprising:

[0009] Determine an equivalent proppant and determine the proppant converted sand amount based on the equivalent proppant and preset fracturing construction data;

[0010] Determining the converted volume of the fracturing fluid according to the preset equivalent viscosity and the preset fracturing construction data;

[0011] Determining the total sand amount converted from all types of proppants and the total liquid amount converted from all types of fracturing fluids, and determining the sand carrying efficiency according to the total sand amount converted from the proppants and the total liquid amount converted from the fracturing fluids;

[0012] Determine the construction pressure window based on preset fracturing construction data;

[0013] The sand carrying efficiency and construction pressure window of each section are normalized respectively to obtain the corresponding normalized results of the sand carrying efficiency and the normalized results of the construction pressure window;

[0014] 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.

[0015] Furthermore, the preset fracturing construction data includes:

[0016] The amount of sand in the proppant, the bulk density of the proppant, the average particle size of the proppant, the amount of fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the viscosity of the fracturing fluid.

[0017] Furthermore, the proppant converted sand amount is determined by the following formula:

[0018]

[0019] Among them, V i 支撑剂折算 V is the converted sand volume of the i-th type of proppant; i 支撑剂原始 is the sand amount of the i-th type of proppant; ρ i is the volume density of the i-th type of proppant; ρ is the volume density of the equivalent proppant; φ i is the average particle size of the i-th type proppant; φ is the average particle size of the equivalent proppant.

[0020] Furthermore, the converted fluid volume of the fracturing fluid is determined by the following formula:

[0021]

[0022] Among them, V i 压裂液折算 V is the converted volume of the i-th type of fracturing fluid; i 压裂液原始 is the liquid volume of the i-th type of fracturing fluid; μ i 压裂液 is the viscosity of the i-th type of fracturing fluid; μ is the preset equivalent viscosity.

[0023] Further, the determining of the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume includes:

[0024] Determine the total reduced sand volume based on the reduced sand volume of each type of proppant;

[0025] Determine the total converted fluid volume according to the converted fluid volume of each type of fracturing fluid;

[0026] The sand carrying efficiency is determined according to the total converted sand volume and the total converted liquid volume.

[0027] Furthermore, the step of determining the construction pressure window includes:

[0028] Determine the wellhead pressure corresponding to the accumulated sand injection amount at the bottom of the well according to the preset fracturing construction data, and determine the average construction pressure according to the wellhead pressure at different times;

[0029] The construction pressure window is determined according to the preset wellhead limit pressure and the average construction pressure.

[0030] Furthermore, the fracturing difficulty index is determined by the following formula:

[0031]

[0032] Among them, FI is the fracturing difficulty index, FI R is the normalized result of sand carrying efficiency, FI p is the normalized result of the construction pressure window.

[0033] The second aspect of the present application provides a shale oil and gas fracturing difficulty evaluation device, the device comprising:

[0034] A proppant conversion sand quantity determination module is used to determine an equivalent proppant and determine the proppant conversion sand quantity according to the equivalent proppant and preset fracturing construction data;

[0035] A fracturing fluid conversion liquid volume determination module, used to determine the fracturing fluid conversion liquid volume according to a preset equivalent viscosity and the preset fracturing construction data;

[0036] A sand carrying efficiency determination module, used to determine the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume;

[0037] A construction pressure window determination module is used to determine the construction pressure window according to preset fracturing construction data;

[0038] 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 normalized results of the corresponding sand carrying efficiency and the normalized results of the construction pressure window;

[0039] The fracturing difficulty index determination module is used to determine the fracturing difficulty index used to evaluate the difficulty of fracturing according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

[0040] According to a third aspect of the present application, a computer-readable storage medium is provided, wherein a computer program stored in the computer-readable storage medium can be executed by one or more processors to implement the steps of the method described above.

[0041] The fourth aspect of the present application provides an electronic device, including a memory and one or more processors, wherein the memory stores a computer program, the memory and the one or more processors are communicatively connected to each other, and when the computer program is executed by the one or more processors, the steps of the method described above are implemented.

[0042] Compared with the prior art, the advantages or beneficial effects of the technical solution of the present application include:

[0043] The present application discloses a method for evaluating the difficulty of shale oil and gas fracturing, which comprehensively considers the influence of multiple parameters such as construction pressure, fracturing material parameters, and comprehensive sand-to-liquid ratio, and provides an effective technical means for post-fracturing analysis and evaluation of fracturing geological environmental factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in the relevant field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0045] It should also be noted that, for the convenience of description, only the parts related to the present disclosure are shown in the drawings. The drawings constituting a part of the specification of this application are used to provide a further understanding of the present application. The illustrative embodiments and their descriptions in this application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0046] Figure 1 A flow chart of a shale oil and gas fracturing difficulty evaluation method provided in an embodiment of the present application;

[0047] Figure 2 A flow chart of another shale oil and gas fracturing difficulty evaluation method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will describe the implementation methods of the present application in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of the present application and the various features in the embodiments can be combined with each other without conflict, and the technical solutions formed are all within the protection scope of the present application.

[0049] It should be clear that the embodiments described below are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present application.

[0050] Embodiment 1

[0051] This embodiment provides a method for evaluating the difficulty of shale oil and gas fracturing. Figure 1 A flowchart of a shale oil and gas fracturing difficulty evaluation method provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method disclosed in this embodiment includes the following steps:

[0052] Step 110: determine an equivalent proppant and determine a proppant-converted sand amount according to the equivalent proppant and preset fracturing construction data.

[0053] As an example, the preset fracturing construction data includes:

[0054] The amount of sand in the proppant, the bulk density of the proppant, the average particle size of the proppant, the amount of fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the viscosity of the fracturing fluid.

[0055] Optionally, the collected preset fracturing construction data may include: proppant test evaluation results, fracturing construction pressure, fracturing sand-to-sand ratio, fracturing fluid viscosity, fracturing fluid proppant parameters and other data.

[0056] As an example, when determining equivalent proppants, the following approach can be taken:

[0057] Considering that shale gas fracturing currently usually uses 70 / 140 mesh, 40 / 70 mesh, 30 / 50 mesh, and 20 / 40 mesh proppants for pumping construction. Considering that the proppants entering the formation are different in type, volume density and particle size, a single amount of sand cannot reflect the difference in process difficulty. Considering the proppant density and particle size comprehensively, it is recommended to unify the equivalent amount of 40 / 70 mesh low-density ceramsite proppant.

[0058] As an example, the proppant converted sand amount is determined by the following formula:

[0059]

[0060] Among them, V i 支撑剂折算 V is the converted sand volume of the i-th type of proppant; i 支撑剂原始 is the sand amount of the i-th type of proppant; ρ i is the volume density of the i-th type of proppant; ρ is the volume density of the equivalent proppant; φ iis the average particle size of the i-th type proppant; φ is the average particle size of the equivalent proppant.

[0061] Step 120: Determine the converted volume of the fracturing fluid according to the preset equivalent viscosity and the preset fracturing construction data.

[0062] Alternatively, considering that shale gas well fracturing currently usually uses glue and slick water for fracturing construction, it is recommended to unify the viscosity to be equivalent to clean water, that is, the preset equivalent viscosity can be the viscosity of clean water.

[0063] As an example, the converted fluid volume of the fracturing fluid is determined by the following formula:

[0064]

[0065] Among them, V i 压裂液折算 V is the converted volume of the i-th type of fracturing fluid; i 压裂液原始 is the liquid volume of the i-th type of fracturing fluid; μ i 压裂液 is the viscosity of the i-th type of fracturing fluid; μ is the preset equivalent viscosity.

[0066] 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.

[0067] As an example, determining the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume includes:

[0068] Determine the total reduced sand volume based on the reduced sand volume of each type of proppant;

[0069] Determine the total converted fluid volume according to the converted fluid volume of each type of fracturing fluid;

[0070] The sand carrying efficiency is determined according to the total converted sand volume and the total converted liquid volume.

[0071] Step 140: Determine the construction pressure window according to preset fracturing construction data.

[0072] As an example, the step of determining the construction pressure window includes:

[0073] Determine the wellhead pressure corresponding to the accumulated sand injection amount at the bottom of the well according to the preset fracturing construction data, and determine the average construction pressure according to the wellhead pressure at different times;

[0074] The construction pressure window is determined according to the preset wellhead limit pressure and the average construction pressure.

[0075] 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.

[0076] Step 160: Determine 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.

[0077] As an example, the fracturing difficulty index is determined by the following formula:

[0078]

[0079] Among them, FI is the fracturing difficulty index, FI R is the normalized result of sand carrying efficiency, FI p is the normalized result of the construction pressure window.

[0080] Embodiment 2

[0081] 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.

[0082] As another example, the proppant-converted sand amount is determined by the following formula:

[0083]

[0084] Among them, V i 支撑剂折算 V is the converted sand volume of the i-th type of proppant, in m3; i 支撑剂原始 is the sand volume of the i-th type of proppant, in m 3 ρ i is the volume density of the i-th type of proppant, in kg / m 3 ρ 低密度陶粒 is the volume density of low-density ceramsite, in kg / m 3 , the recommended value is 1650kg / m 3 ; φ i is the average particle size of the i-th type of proppant, in μm; φ 40 / 70 It is the average particle size of 40 / 70 mesh proppant in μm, and the recommended value is 340 μm.

[0085] It should be noted that, according to actual needs, the equivalent proppant may also be determined as proppant of other particle sizes or types.

[0086] As another example, the preset equivalent viscosity is uniformly equivalent to the viscosity of clean water, and the converted liquid volume of the fracturing fluid is determined by the following formula:

[0087]

[0088] Among them, V i 压裂液折算 V is the converted volume of the i-th type of fracturing fluid, in m3; i 压裂液原始 is the volume of the i-th type of fracturing fluid, in m 3 ;μ i 压裂液 is the viscosity of the i-th type of fracturing fluid, in mPa·s; μ 清水 It is the viscosity of clean water, in mPa·s, and its value can generally be 1.

[0089] It should be noted that, according to actual needs, the preset equivalent viscosity can also be uniformly equivalent to the viscosity of fracturing fluids such as slick water.

[0090] As an example, in step 130, the proppant converted total sand volume, the fracturing fluid converted total fluid volume, and the sand carrying efficiency may be determined in the following manner:

[0091]

[0092] In this formula, V 压裂液折算 is the total volume of fracturing fluid converted, in m3; n is the number of fracturing fluid types;

[0093]

[0094] In this formula, V 支撑剂折算 is the total sand volume converted from proppant, in m3; n is the number of proppant types;

[0095] Furthermore, the total sand volume carried by the converted total fluid volume per unit volume is used to characterize the sand carrying efficiency of the fracturing fluid in this section, that is:

[0096]

[0097] In this formula, R is the sand carrying efficiency and is dimensionless.

[0098] As an example, in step 140, according to construction experience, when sand enters the formation, if it is difficult to create a seam, the seam width is narrow, and it is difficult to add sand, it is easy to cause a complex situation where the construction pressure increases and the construction pressure window is narrow. In view of this, the average construction pressure window when the sand enters the formation is used to characterize the difficulty of fracturing. Considering that the data recorded in the current field construction are mostly the data of the wellhead proppant sand ratio and the amount of liquid inflow, these data need to be processed as follows:

[0099]

[0100] In this formula, The cumulative sand volume at the bottom of the well is V 支撑剂 The construction pressure at the time, in MPa; The cumulative sand volume at the wellhead is V 支撑剂 The cumulative liquid inflow at the wellhead at the time, in m 3 ; V 井筒 is the wellbore volume, in m 3 ; The accumulated liquid volume at the wellhead is The construction pressure at that time is in MPa.

[0101] Furthermore, according to the wellhead pressure when the sand-carrying fluid enters the formation at different times, the average construction pressure during the sand-adding period is calculated by the following formula:

[0102]

[0103] In this formula, is the average construction pressure during the sand adding period, in MPa; t i Wellhead pressure at the moment ), in MPa; Δt is the construction pressure recording interval, in seconds; t is the cumulative time of sand entering the formation, in seconds.

[0104] Finally, combined with the preset wellhead pressure limit (the surface equipment pressure limit can be used), the construction pressure window is calculated by the following formula:

[0105]

[0106] In this formula, p 窗口 is the construction pressure window, in MPa; p 限压 It is the limit pressure of ground equipment, in MPa.

[0107] As an example, in step 150, when a single well is used 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. Specifically:

[0108]

[0109]

[0110] In this formula, R i is the sand carrying efficiency of the i-th section, dimensionless; FI R It is the normalized result of sand carrying efficiency and is dimensionless; FI p is the normalized result of the construction pressure window, dimensionless; p 窗口i is the construction pressure window of the ith section, in MPa.

[0111] As an example, in step 160, the fracturing difficulty index is determined according to the normalized results of the sand carrying efficiency and the normalized results of the construction pressure window. Specifically:

[0112]

[0113] In this formula, FI is the fracturing difficulty index and is dimensionless.

[0114] In addition, in order to facilitate understanding of the technical solution of this application, you can also refer to Figure 2 .

[0115] In summary, this embodiment discloses a method for evaluating the difficulty of shale oil and gas fracturing, which comprehensively considers the influence of multiple parameters such as construction pressure, fracturing material parameters, and comprehensive sand-to-liquid ratio, and provides an effective technical means for post-fracturing analysis and evaluation of fracturing geological environmental factors.

[0116] Embodiment 3

[0117] Based on the above embodiments, this embodiment takes a shale gas well in southwestern Sichuan as an example to further explain and illustrate the shale oil and gas fracturing difficulty evaluation method disclosed in this application.

[0118] Specifically, a shale gas well in southwest Sichuan has a vertical depth of 3931.00m and a measured depth of 5560.00m. The fracturing difficulty index is determined according to the following process:

[0119] (1) Determine the sand carrying efficiency:

[0120] This well uses three types of fluids: low-viscosity slippery water, high-viscosity slippery water, and gel. Among them, low-viscosity slippery water is 3mPa·s, high-viscosity slippery water is 15mPa·s, and gel is 60mPa·s. The converted fluid volume is shown in Table 1.

[0121] Table 1 Calculation results of converted liquid volume

[0122]

[0123]

[0124] This well used two types of proppants: 70 / 140 mesh quartz sand and 40 / 70 mesh ceramsite. According to the density and average particle size of the evaluation experiment, the converted sand volume is shown in Table 2.

[0125] Table 2 Calculation results of converted sand volume

[0126]

[0127]

[0128] On this basis, the sand carrying efficiency of each section is further calculated.

[0129] Among them, the sand carrying efficiency can be referred to Table 3.

[0130] Table 3 Calculation results of sand carrying efficiency

[0131]

[0132]

[0133] (2) Determine the construction pressure window:

[0134] The pressure limit of this well is 112MPa. The calculation results of the construction pressure window for sand entering the formation are shown in Table 4.

[0135] Table 4 Calculation of construction pressure window

[0136]

[0137] (3) Determine the fracturing difficulty index:

[0138] After normalizing the sand carrying efficiency and the construction pressure window, the fracturing difficulty index is determined based on the normalized results.

[0139] The calculation results of the fracturing difficulty index can be found in Table 5.

[0140] Table 5 Calculation method of fracturing difficulty index

[0141]

[0142] Furthermore, the difficulty of shale oil and gas fracturing is evaluated based on the determined fracturing difficulty index.

[0143] Embodiment 4

[0144] This embodiment provides a shale oil and gas fracturing difficulty evaluation device. This device embodiment can be used to execute the method embodiment of this application. For details not disclosed in this device embodiment, please refer to the method embodiment of this application. The device disclosed in this embodiment includes:

[0145] A proppant conversion sand quantity determination module is used to determine an equivalent proppant and determine the proppant conversion sand quantity according to the equivalent proppant and preset fracturing construction data;

[0146] A fracturing fluid conversion liquid volume determination module, used to determine the fracturing fluid conversion liquid volume according to a preset equivalent viscosity and the preset fracturing construction data;

[0147] A sand carrying efficiency determination module, used to determine the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume;

[0148] A construction pressure window determination module is used to determine the construction pressure window according to preset fracturing construction data;

[0149] 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 normalized results of the corresponding sand carrying efficiency and the normalized results of the construction pressure window;

[0150] The fracturing difficulty index determination module is used to determine the fracturing difficulty index used to evaluate the difficulty of fracturing according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

[0151] In some embodiments, the preset fracturing construction data includes:

[0152] The amount of sand in the proppant, the bulk density of the proppant, the average particle size of the proppant, the amount of fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the viscosity of the fracturing fluid.

[0153] In some embodiments, the proppant converted sand amount is determined by the following formula:

[0154]

[0155] Among them, V i 支撑剂折算 V is the converted sand volume of the i-th type of proppant; i 支撑剂原始 is the sand amount of the i-th type of proppant; ρ i is the volume density of the i-th type of proppant; ρ is the volume density of the equivalent proppant; φ i is the average particle size of the i-th type proppant; φ is the average constant of the equivalent proppant particle size.

[0156] In some embodiments, the converted fluid volume of the fracturing fluid is determined by the following formula:

[0157]

[0158] Among them, V i 压裂液折算 V is the converted volume of the i-th type of fracturing fluid; i 压裂液原始 is the liquid volume of the i-th type of fracturing fluid; μ i 压裂液 is the viscosity of the i-th type of fracturing fluid; μ is the preset equivalent viscosity.

[0159] In some embodiments, the sand carrying efficiency determination module includes: a total converted sand volume determination unit, a total converted liquid volume determination unit and a sand carrying efficiency determination unit; wherein,

[0160] A total converted sand volume determination unit is used to determine the total converted sand volume according to the converted sand volume of each type of proppant;

[0161] A total converted fluid volume determination unit, used to determine the total converted fluid volume according to the converted fluid volumes of each type of fracturing fluid;

[0162] The sand carrying efficiency determination unit is used to determine the sand carrying efficiency according to the total converted sand volume and the total converted liquid volume.

[0163] In some embodiments, the construction pressure window determination module includes: an average construction pressure determination unit and a construction pressure window determination unit; wherein,

[0164] An average construction pressure determination unit is used to determine the wellhead pressure corresponding to the cumulative sand injection amount at the bottom of the well according to the preset fracturing construction data, and determine the average construction pressure according to the wellhead pressure at different times;

[0165] The construction pressure window determination unit is used to determine the construction pressure window according to a preset wellhead limit pressure and the average construction pressure.

[0166] In some embodiments, the fracturing difficulty index is determined by the following formula:

[0167]

[0168] Among them, FI is the fracturing difficulty index, FI R is the normalized result of sand carrying efficiency, FI p is the normalized result of the construction pressure window.

[0169] Those skilled in the art will understand that the structure shown in this embodiment does not constitute a limitation on the device of the embodiment of the present application, and may include more or fewer modules / units than shown in the figure, or a combination of certain modules / units, or different module / unit arrangements.

[0170] It should be understood by those skilled in the art that the above modules or steps of the present application can be implemented by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices. Optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation.

[0171] Technicians in the relevant field can clearly understand that, for the convenience and simplicity 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 aforementioned method embodiment, and this embodiment will not be repeated here.

[0172] Embodiment 5

[0173] This embodiment provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method steps in the above method embodiment can be implemented, and this embodiment will not be repeated here.

[0174] Among them, the computer-readable storage medium may also include computer programs, data files, data structures, etc. alone, or include a combination thereof. The computer-readable storage medium or computer program may be specifically designed and understood by a technician in the field of computer software, or the computer-readable storage medium may be known and available to a technician in the field of computer software. Examples of computer-readable storage media include: magnetic media, such as hard disks, floppy disks, and tapes; optical media, such as CDROM 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, etc. Examples of computer programs include machine code (e.g., code generated by a compiler) and files containing high-level code, which can be executed by a computer using an interpreter. The described hardware device may be configured to be used as one or more software modules to perform the operations and methods described above, and vice versa. In addition, the computer-readable storage medium may be distributed in a networked computer system, and program code or computer programs may be stored and executed in a decentralized manner.

[0175] Embodiment 6

[0176] This embodiment provides a computer program product. The computer program product includes a computer program or instructions, and when the computer program or instructions are executed by a processor, all or part of the steps of the method in the above method embodiment are implemented, and this embodiment will not be repeated here.

[0177] Further, the computer program product may include one or more computer executable components configured to perform the embodiments when the program is run; the computer program product may also include a computer program tangibly contained on a readable medium, the computer program including program code for performing any method in the embodiments of the present disclosure. In such an embodiment, the computer program may be downloaded and installed from a network through a communication portion, and / or installed from a removable medium.

[0178] Embodiment 7

[0179] This embodiment provides an electronic device, which may include: one or more processors, a memory, a multimedia component, an input / output (I / O) interface, and a communication component.

[0180] One or more processors are used to execute all or part of the steps in the above method embodiments. The memory is used to store various types of data, which may include instructions of any application or method in the electronic device, and data related to the application.

[0181] One or more processors may 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 components, and are used to execute the method in the aforementioned method embodiment.

[0182] The memory can be implemented by any type of volatile or non-volatile storage device or a combination of them, 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.

[0183] The multimedia component may include a screen and an audio component, the screen may be a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, and the microphone is used to receive external audio signals. The received audio signal may be further stored in a memory or sent via a communication component. The audio component also includes at least one speaker for outputting audio signals.

[0184] The I / O interface provides an interface between one or more processors and other interface modules, which may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.

[0185] The communication component is used for wired or wireless communication between the electronic device and other devices. Wired communication includes communication through network ports, serial ports, etc.; wireless communication includes: Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, 5G, or one or a combination of them.

[0186] In addition, it should be understood that the method or device disclosed in the embodiments provided in the present application can also be implemented in other ways. The method or device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the methods and devices according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a computer program segment or a part of a computer program, and the module, computer program segment or a part of a computer program 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 box can also occur in a different order from the order marked in the accompanying drawings, and can actually be executed in parallel. They can also be executed in the opposite order sometimes, 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 can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer programs.

[0187] In this application, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, device or equipment including the elements; if there is a description of "first", "second", etc., it is only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features; in the description of this application, unless otherwise specified, the terms "multiple" and "multiple" mean at least two; if there is a description of a server, it should be noted that the server can be an independent physical server or terminal, or a server cluster composed of multiple physical servers, or a cloud server that can provide basic cloud computing services such as cloud servers, cloud databases, cloud storage and CDN; if there is a description of a smart terminal or mobile device in this application, it should be noted that the smart terminal or mobile device can be a mobile phone, a tablet computer, a smart watch, a netbook, a wearable electronic device, a personal digital assistant (PDA), an augmented reality technology device (AR), a virtual reality device (VR), a smart TV, a smart speaker, a personal computer (PC), a tablet computer, a smart phone, a smart TV, a smart speaker, a smart phone ... Computer, referred to as PC), etc., but not limited to this, the present application does not specifically limit the specific form of the smart terminal or mobile device.

[0188] Finally, it should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "an example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0189] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary, and the contents described are only embodiments adopted for the convenience of understanding the present application, and are not intended to limit the present application. Any technician in the technical field to which the present application belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present application, but the scope of protection of the present application shall still be based on the scope defined in the attached 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; Determining the converted volume of the fracturing fluid according to the preset equivalent viscosity and the preset fracturing construction data; Determining the total sand amount converted from all types of proppants and the total liquid amount converted from all types of fracturing fluids, and determining the sand carrying efficiency according to the total sand amount converted from the proppants and the total liquid amount converted from the fracturing fluids; Determine the construction pressure window based on preset fracturing construction data; The sand carrying efficiency and construction pressure window of each section are normalized respectively to obtain the corresponding normalized results of the sand carrying efficiency and the normalized results of the 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 preset fracturing construction data include: The amount of sand in the proppant, the bulk density of the proppant, the average particle size of the proppant, the amount of fracturing fluid, the fracturing construction pressure, the fracturing sand-to-sand ratio, and the viscosity of the fracturing fluid.

3. The shale oil and gas fracturing difficulty evaluation method according to claim 1, characterized in that: The proppant converted sand amount is determined by the following formula: Among them, V i 支撑剂折算 V is the converted sand volume of the i-th type of proppant; i 支撑剂原始 is the sand amount of the i-th type of proppant; ρ i is the volume density of the i-th type of proppant; ρ is the volume density of the equivalent proppant; φ i is the average particle size of the i-th type proppant; φ is the average particle size of the equivalent proppant.

4. The shale oil and gas fracturing difficulty evaluation method according to claim 1, characterized in that: The converted fluid volume of the fracturing fluid is determined by the following formula: Among them, V i 压裂液折算 V is the converted volume of the i-th type of fracturing fluid; i 压裂液原始 is the liquid volume of the i-th type of fracturing fluid; μ i 压裂液 is the viscosity of the i-th type of fracturing fluid; μ is the preset equivalent viscosity.

5. The shale oil and gas fracturing difficulty evaluation method according to claim 1, characterized in that: The determining of the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume comprises: Determine the total reduced sand volume based on the reduced sand volume of each type of proppant; Determine the total converted fluid volume according to the converted fluid volume of each type of fracturing fluid; The sand carrying efficiency is determined according to the total converted sand volume and the total converted liquid volume.

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

7. 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: Among them, FI is the fracturing difficulty index, FI R is the normalized result of sand carrying efficiency, FI p is the normalized result of the construction pressure window.

8. 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 according to the equivalent proppant and preset fracturing construction data; A fracturing fluid conversion liquid volume determination module, used to determine the fracturing fluid conversion liquid volume according to a preset equivalent viscosity and the preset fracturing construction data; A sand carrying efficiency determination module, used to determine the sand carrying efficiency according to the proppant converted sand volume and the fracturing fluid converted liquid volume; 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 normalized results of the corresponding sand carrying efficiency and the normalized results of the construction pressure window; The fracturing difficulty index determination module is used to determine the fracturing difficulty index used to evaluate the difficulty of fracturing according to the normalized result of the sand carrying efficiency and the normalized result of the construction pressure window.

9. 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 7.

10. An electronic device, characterized in that: It 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 shale oil and gas fracturing difficulty evaluation method as described in any one of claims 1 to 7 is implemented.

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