Fractured reservoir fracture network complexity processing method and device and electronic equipment

Abstract

The invention discloses a method and a device for processing the complexity of a fracture network of a fractured reservoir and electronic equipment. The method comprises the following steps: determining target operation parameters of a volume fracturing device according to mechanical parameters of a target reservoir and to-be-selected operation parameters of the volume fracturing device; determining the filling amount and the filling components of the filler in the crack of the target reservoir, and determining the component parameters of the volume fracturing fluid according to the filling amount and the filling components; and based on the target operation parameters and the component parameters, controlling a volume fracturing device to inject volume fracturing fluid into the cracks of the target reservoir to corrode fillers in the cracks of the target reservoir, and injecting sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir. The problem that in the prior art, the fracture transformation degree of an ultra-deep fractured reservoir is low is solved, transformation of natural fractures with different filling degrees and different fillers is achieved, the natural fractures are activated and communicated to the maximum extent, and the fracture network complexity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of reservoir transformation in oil and gas field development, and in particular to a method, a device and an electronic device for processing the complexity of fracture network of fractured reservoirs. Background Art

[0002] Ultra-deep fractured tight sandstone reservoirs are characterized by deep burial, high temperature, high pressure and high stress, low porosity and low permeability of the matrix, and well-developed natural fractures. Natural fractures are the main storage space and seepage channels. During the transformation process, natural fractures and artificial fractures must be used to form an underground fracture network system. Activating natural fractures and maintaining a certain conductivity is the key to increasing the production of this type of reservoir transformation.

[0003] At present, the volume fracturing technology is mainly used to form the fracture network system, which is widely used in various types of oil and gas reservoirs such as shale, carbonate rock, sandstone, etc. The key to the volume fracturing technology is to use hydraulic action to activate a large number of natural fractures. The artificial fractures interact with the natural fractures, greatly increasing the complexity of the fractures and forming a criss-crossing fracture network.

[0004] In previous fracturing research and practice, the method of alternating injection of low-viscosity fracturing fluid and high-viscosity fracturing fluid combined with large-volume pumping is generally used to shear activate and support natural fractures with small particle sizes. Although this method has a certain effect on activating natural fractures at all levels, the filling degree and filling composition of natural fractures in ultra-deep fractured reservoirs vary greatly. For natural fractures with a high filling degree, it is difficult to maximize the transformation and support of natural fractures by relying solely on hydraulic action. Therefore, it is necessary to invent a process design method to transform natural fractures with different filling degrees and different fillings in a targeted manner, to maximize the activation and communication of natural fractures, and to increase the complexity of the fracture network. Summary of the invention

[0005] The present invention provides a method, device and electronic equipment for processing the complexity of fracture network of fractured reservoirs, so as to realize the transformation of natural fractures with different filling degrees and different filling materials, activate and communicate natural fractures to the greatest extent, and improve the complexity of fracture network.

[0006] According to one aspect of the present invention, a method for processing the complexity of fracture network of fractured reservoir is provided, comprising:

[0007] Determining target operating parameters of the volume fracturing device according to mechanical parameters of the target reservoir and candidate operating parameters of the volume fracturing device; wherein the target operating parameters include structural parameters of the fracturing pipe, density parameters of the volume fracturing fluid and the operation displacement of the volume fracturing device;

[0008] Determining the filling amount and filling composition of the filler in the cracks of the target reservoir, and determining the composition parameters of the volume fracturing fluid according to the filling amount and the filling composition;

[0009] Based on the target operating parameters and the composition parameters, the volume fracturing device is controlled to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir, and sand-carrying fracturing fluid is injected into the target reservoir to support the cracks in the target reservoir.

[0010] According to another aspect of the present invention, there is provided a device for processing the complexity of fracture network of fractured reservoirs, comprising:

[0011] An operating parameter determination module, used to determine target operating parameters of the volume fracturing device according to mechanical parameters of the target reservoir and selected operating parameters of the volume fracturing device; wherein the target operating parameters include structural parameters of the fracturing pipe, density parameters of the volume fracturing fluid and the operation displacement of the volume fracturing device;

[0012] A component parameter determination module, used to determine the filling amount and filling composition of the filler in the cracks of the target reservoir, and determine the component parameters of the volume fracturing fluid according to the filling amount and the filling composition;

[0013] The target reservoir injection module is used to control the volume fracturing device to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir based on the target operating parameters and the composition parameters, and to inject sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir.

[0014] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0015] at least one processor;

[0016] and a memory communicatively coupled to the at least one processor;

[0017] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for processing the complexity of the fracture network of the fractured reservoir described in any embodiment of the present invention.

[0018] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for processing the complexity of a fracture network of a fractured reservoir as described in any embodiment of the present invention when executed.

[0019] The technical solution of the embodiment of the present invention determines the target operating parameters of the volume fracturing device according to the mechanical parameters of the target reservoir and the candidate operating parameters of the volume fracturing device; determines the filling amount and filling composition of the filler in the cracks of the target reservoir, and determines the composition parameters of the volume fracturing fluid according to the filling amount and filling composition; based on the target operating parameters and composition parameters, controls the volume fracturing device to inject volume fracturing fluid into the cracks of the target reservoir to dissolve the filler in the cracks of the target reservoir, and injects sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir. The problem of low degree of fracture transformation of ultra-deep fractured reservoirs by current technology is solved, and the transformation of natural fractures with different filling degrees and different fillings is realized, activating and communicating natural fractures to the greatest extent and improving the complexity of the fracture network.

[0020] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a flow chart of a method for processing the complexity of fracture network of fractured reservoirs provided according to the first embodiment of the present invention;

[0023] Figure 2 This is a natural fracture without filling map;

[0024] Figure 3 This is a semi-filled diagram of natural fractures;

[0025] Figure 4 This is a full filling map of natural fractures;

[0026] Figure 5 It is a structural schematic diagram of a device for processing the complexity of fracture network of fractured reservoirs provided in the third embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Embodiment 1

[0031] Figure 1 This is a flow chart of a method for processing the complexity of fractured reservoir network according to the first embodiment of the present invention. This embodiment is applicable to the case of increasing the complexity of target reservoir network. The method can be executed by a device for processing the complexity of fractured reservoir network. The device for processing the complexity of fractured reservoir network can be implemented in the form of hardware and / or software. The device for processing the complexity of fractured reservoir network can be configured in a volume fracturing device. Figure 1 As shown, the method includes:

[0032] S110, determining operating parameters of the volume fracturing device according to mechanical parameters of the target reservoir and candidate operating parameters of the volume fracturing device.

[0033] Among them, the target operating parameters include fracturing pipe structure parameters, volumetric fracturing fluid density parameters and construction displacement of the volumetric fracturing device; in this embodiment, the target reservoir can be an ultra-deep fractured tight sandstone reservoir, and the mechanical parameters of the target reservoir refer to parameters related to target reservoir stress or pressure, such as horizontal stress, pore pressure, etc. The volumetric fracturing fluid density parameter refers to the density value of the volumetric fracturing fluid. The volumetric fracturing device can be understood as volumetric fracturing equipment, such as a high-pressure fracturing pump, etc. Correspondingly, the optional operating parameters of the volumetric fracturing device refer to parameters such as the optional displacement of the volumetric fracturing device and the diameter of the volumetric fracturing pipe string.

[0034] In this embodiment, it is determined whether the current candidate operating parameters of the volume fracturing device can activate the cracks in the target reservoir and increase the complexity of the cracks in the target reservoir according to the mechanical parameters of the target reservoir and the candidate operating parameters of the volume fracturing device. If the current candidate operating parameters can activate the cracks in the target reservoir, the current candidate operating parameters can be determined as the target operating parameters of the volume fracturing device.

[0035] On the basis of the above embodiment, the target operating parameters of the volume fracturing device are determined according to the mechanical parameters of the target reservoir and the selected operating parameters of the volume fracturing device, including: calculating the pore pressure increment corresponding to the target reservoir based on the selected construction displacement, wellbore friction and the constant to be used corresponding to the volume fracturing device; wherein the constant to be used is determined based on the maximum horizontal principal stress, the minimum horizontal principal stress, the pore pressure and the hydrostatic column pressure of the target reservoir; and determining the target operating parameters of the volume fracturing device based on the pore pressure increment corresponding to the target reservoir, the pore pressure and the minimum horizontal principal stress.

[0036] In this embodiment, the construction displacement to be selected refers to the optional construction displacement of the volume fracturing device, and the constant value to be used is a value calculated based on the maximum horizontal principal stress, minimum horizontal principal stress, pore pressure and hydrostatic column pressure of the target reservoir. Exemplarily, the constant value to be used is equal to 3 times the minimum horizontal principal stress minus the maximum horizontal principal stress minus the pore pressure and hydrostatic column pressure; on this basis, the maximum construction pressure on the ground can be calculated according to the construction displacement to be selected. The maximum construction pressure is equal to the sum of the constant value to be used, the pore pressure increment and the wellbore friction, so the pore pressure increment can be obtained based on this. Further, after the pore pressure increment is obtained, the target operating parameters of the volume pressure device are determined based on the pore pressure increment, pore pressure and minimum horizontal principal stress corresponding to the target reservoir.

[0037] On the basis of the above technical solution, the target operating parameters of the volume pressure device are determined based on the pore pressure increment corresponding to the target reservoir, the pore pressure and the minimum horizontal principal stress, including: if the sum of the pore pressure increment and the pore pressure is greater than the minimum horizontal principal stress, then the selected construction displacement, the fracturing pipe structural parameters associated with the wellbore friction resistance, and the volume fracturing fluid density parameters associated with the static liquid column pressure are used as the target operating parameters.

[0038] Specifically, if the sum of the pore pressure increment and the pore pressure is greater than the minimum horizontal principal stress, it means that the current working parameters can open the fracture shear, so the construction displacement to be selected at this time, the fracturing pipe structure parameters associated with the wellbore friction resistance, and the volume fracturing fluid density parameters associated with the static liquid column pressure are used as target operating parameters.

[0039] On the basis of the above technical solution, it also includes: if the sum of the pore pressure increment and the pore pressure is less than the minimum horizontal principal stress, adjusting at least one of the selected construction displacement, the fracturing pipe structure parameters and the density parameters to make the sum of the pore pressure increment and the pore pressure greater than the minimum horizontal principal stress.

[0040] It is understandable that if the sum of the pore pressure increment and the pore pressure is less than the minimum horizontal principal stress, it means that the current selected operating parameters are not sufficient to shear open the fracture, and it is necessary to adjust, specifically, to adjust at least one of the selected construction displacement, fracturing pipe structure parameters and density parameters, so that the sum of the pore pressure increment and the pore pressure is greater than the minimum horizontal principal stress. Among them, the fracturing pipe structure parameter can be the diameter of the fracturing pipe string, and the density parameter refers to the density value of the volume fracturing fluid. For example, the density of the fracturing fluid is increased, the diameter of the fracturing pipe string is increased, etc., to ensure that the natural fracture can be sheared open at a given maximum construction displacement.

[0041] S120, determining the filling amount and filling composition of the filler in the cracks of the target reservoir, and determining the composition parameters of the volume fracturing fluid according to the filling amount and the filling composition.

[0042] In the embodiment of the present invention, by analyzing the filling composition and filling amount of the filler in the cracks of the target reservoir, a corresponding volume fracturing fluid is designed according to the filling amount and filling composition, and the composition parameters of the volume fracturing fluid are determined.

[0043] On the basis of the above-mentioned embodiment, the method for determining the filling amount and filling composition of the filler in the cracks of the target reservoir comprises: taking core samples of the target reservoir to determine the filling amount of the filler in the cracks of the core; wherein the filling amount comprises one of unfilled, partially filled and fully filled; performing a component analysis experiment based on the filler in the cracks of the core, and determining the filling composition of the filler in the cracks of the target reservoir based on the experimental results, wherein the filling composition is one of siliceous filling and calcareous filling.

[0044] In this embodiment, the filling degree of the natural fractures in the core can be determined by sampling and observing the full-diameter core. If there is no filling in the natural fracture, the filling degree is no filling, if the natural fracture is completely filled with filling, it is full filling, and the filling degree in between is half filling. Further, the core and the filling are sampled separately for whole rock and clay mineral composition analysis experiments to determine the content of quartz, feldspar, clay minerals, etc. in the core and the filling, and to clarify whether the main component of the filling is siliceous filling or calcareous filling.

[0045] On the basis of the above embodiment, the component parameters of the volume fracturing fluid are determined according to the filling amount and the filling component, including: if the filling amount is no filling, determining that the component of the volume fracturing fluid is slick water; if the filling amount is half filling or full filling, and the filling component is calcium filling, determining the hydrochloric acid concentration corresponding to the calcium filling based on a dissolution experiment, and determining the slick water and the hydrochloric acid concentration as the component parameters of the volume fracturing fluid; if the filling amount is half filling or full filling, and the filling component is siliceous filling, determining the hydrochloric acid-hydrofluoric acid mixture concentration corresponding to the siliceous filling based on a dissolution experiment, and determining the slick water and the hydrochloric acid-hydrofluoric acid mixture concentration as the component parameters of the volume fracturing fluid.

[0046] Exemplarily, if the filling amount is no filling, the slick water is directly used as the volumetric fracturing fluid. If the filling amount is half filling or full filling, it is determined whether the filling component is calcium filling or silica filling. If it is calcium, slick water and a certain concentration of hydrochloric acid are used as the volumetric fracturing fluid. If it is silica, slick water and a certain concentration of hydrochloric acid-hydrofluoric acid mixture are determined as the volumetric fracturing fluid.

[0047] It should also be noted that the concentration of hydrochloric acid and the concentration of the hydrochloric acid-hydrofluoric acid mixture are determined through experiments. The hydrochloric acid concentration corresponding to the calcium filling is determined based on the dissolution experiment, including: for multiple core samples of the same material, using hydrochloric acid liquids of different concentrations to dissolve the calcium fillings in the cracks in the core samples, and taking the concentration of the hydrochloric acid liquid when the dissolution rate reaches the preset dissolution rate as the hydrochloric acid concentration corresponding to the calcium filling.

[0048] For example, if the filling material is a calcium filling material, a hydrochloric acid dissolution rate test is conducted to evaluate the filling material, and the dissolution rate test of the filling material is conducted at a hydrochloric acid concentration of 8%, 9%, 10%, 12%, and 15%, respectively, and the hydrochloric acid concentration at which the dissolution rate reaches 20% is preferably selected. If the filling material is a siliceous filling material, a hydrochloric acid and hydrofluoric acid mixed acid solution dissolution rate test is conducted to evaluate the filling material, and the dissolution test of the filling material is conducted at a hydrochloric acid and hydrofluoric acid mixed acid concentration of 10% hydrochloric acid + (1.0%, 1.5%, 2.0%, 2.5%) hydrofluoric acid, respectively, and the hydrochloric acid and hydrofluoric acid mixed acid concentration at which the dissolution rate reaches 20% is preferably selected.

[0049] S130. Based on the target operating parameters and the component parameters, control the volume fracturing device to inject volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir, and inject sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir.

[0050] In this embodiment, volume fracturing fluid is injected into the target reservoir through a volume fracturing device. Specifically, the injections may be repeated alternately to activate the cracks and dissolve the fillers. Finally, gel fracturing fluid is injected into the target reservoir to support the cracks, thereby constructing a fracture network and increasing the complexity of the fracture network.

[0051] Exemplarily, if the natural fractures are unfilled, 100m3 of slick water is injected first during fracturing construction to activate the natural fractures; if after analysis of the whole rock and clay mineral composition, the fillings in the natural fractures are mainly calcium fillings, 100m3 of slick water is injected first during fracturing construction to activate the natural fractures, and then 30m3 of hydrochloric acid with a concentration determined experimentally is injected to dissolve the calcium fillings in the natural fractures; if the fillings in the natural fractures are mainly siliceous fillings, 100m3 of slick water is injected first during fracturing construction to activate the natural fractures, and then 30m3 of a mixed acid solution of hydrochloric acid and hydrofluoric acid with a concentration determined experimentally is injected to dissolve the siliceous fillings in the natural fractures.

[0052] On the basis of the above embodiment, the method of controlling the volume fracturing device to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir based on the target operating parameters and the composition parameters includes: controlling the operation of the volume fracturing device based on the target operating parameters to inject a volume fracturing fluid corresponding to the composition parameters into the cracks of the target reservoir; and dissolving the fillers in the cracks of the target reservoir based on the volume fracturing fluid.

[0053] It can be understood that the component parameters refer to the component parameters corresponding to the volume fracturing fluid. In the aforementioned experiment, if the component parameters are determined to be slick water plus 13% hydrochloric acid, accordingly, when the volume fracturing fluid is injected into the fracture, the volume fracturing fluid corresponding to the component parameters is injected. After alternately injecting slick water and hydrochloric acid, 5m3 of slick water carrying 70-140 mesh high-strength ceramsite is injected to activate, dissolve and support natural fractures. The high-strength proppant improves the conductivity of the fracture network system. Finally, the gel fracturing fluid is injected to form the main fracture. The gel fracturing fluid carries 40-70 mesh high-strength ceramsite to support the artificial fracture, realize the fracture network construction, and maximize the complexity of the fracture.

[0054] The technical solution of the embodiment of the present invention determines the target operating parameters of the volume fracturing device according to the mechanical parameters of the target reservoir and the candidate operating parameters of the volume fracturing device; determines the filling amount and filling composition of the filler in the cracks of the target reservoir, and determines the composition parameters of the volume fracturing fluid according to the filling amount and filling composition; based on the target operating parameters and composition parameters, controls the volume fracturing device to inject volume fracturing fluid into the cracks of the target reservoir to dissolve the filler in the cracks of the target reservoir, and injects sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir. The problem of low degree of fracture transformation of ultra-deep fractured reservoirs by current technology is solved, and the transformation of natural fractures with different filling degrees and different fillings is realized, activating and communicating natural fractures to the greatest extent and improving the complexity of the fracture network.

[0055] Embodiment 2

[0056] Embodiment 2 of the present invention provides a method for processing the complexity of fracture network of fractured reservoirs. This embodiment is a preferred embodiment of the above embodiment, and its specific implementation method can refer to the technical solution of this embodiment. Among them, the technical terms that are the same or corresponding to the above embodiment are not repeated here. The method includes:

[0057] Step 1: Calculate the construction pressure and displacement required for the shear opening of natural fractures. When natural fractures are sheared and opened, the maximum construction pressure P on the ground is maxpump and the maximum horizontal principal stress σ H , minimum horizontal principal stress σ h , pore pressure P p , maximum increment of pore pressure ΔP max , Hydrostatic column pressure P m and wellbore friction P F related:

[0058] P maxpump =3σ h -σ H -P p +ΔP max -P m +P F (1)

[0059] In the target layer of the same well, the maximum horizontal principal stress, minimum horizontal principal stress, pore pressure, and wellbore fluid column pressure are not much different, and can be simplified to a constant value G:

[0060] G=3σ h -σ H -P p -P m (2)

[0061] Therefore, according to equations (1) and (2), we can obtain:

[0062] P maxpump =G+ΔP max +P F (3)

[0063] After the diameter of the fracturing string, the density of the fracturing fluid, and the extension pressure gradient are determined, the maximum surface construction pressure P can be obtained at a given maximum construction displacement. maxpump and wellbore friction P F Therefore, according to formula (3), the maximum increment of pore pressure ΔP can be obtained max , when the pore pressure P p The maximum increment of pore pressure ΔP max The sum is greater than the minimum horizontal principal stress σ h When the pore pressure P p The maximum increment of pore pressure ΔP max The sum is less than the minimum horizontal principal stress σ h When the natural fractures cannot be sheared open, it is necessary to increase the density of the fracturing fluid and the diameter of the fracturing string to ensure that the natural fractures can be sheared open under a given maximum construction displacement.

[0064] Step 2: Analyze the filling degree of the fracture based on the core sampling to determine whether it is no filling, semi-filling or full filling, and analyze whether the main component of the filling is siliceous filling or calcium filling. Figure 2 , Figure 3 , Figure 4 , Figure 2 This is a natural fracture without filling. Figure 3 This is the semi-filled diagram of natural fractures. Figure 4 This is a full filling diagram of natural fractures. According to the full-diameter core sampling observation, the filling degree of natural fractures in the core can be determined. If there is no filling in the natural fracture, the filling degree is no filling. If the natural fracture is completely filled with fillings, it is full filling, and the one between the two is half filling. The core and filling are sampled separately for whole rock and clay mineral composition analysis experiments to determine the content of quartz, feldspar, clay minerals, etc. in the core and filling, and to clarify whether the main component of the filling is siliceous filling or calcareous filling. If the filling is calcareous filling, the hydrochloric acid dissolution rate experiment is evaluated, and the dissolution rate experiments of the filling are carried out at hydrochloric acid concentrations of 8%, 9%, 10%, 12%, and 15%, respectively. The hydrochloric acid concentration when the dissolution rate reaches 20% is preferred. If the filling material is siliceous filling, a dissolution rate experiment of a mixed acid solution of hydrochloric acid and hydrofluoric acid is carried out to evaluate it. The dissolution experiments of the filling material are carried out when the mixed concentration of hydrochloric acid and hydrofluoric acid is 10% hydrochloric acid + (1.0%, 1.5%, 2.0%, 2.5%) hydrofluoric acid, and the mixed concentration of hydrochloric acid and hydrofluoric acid when the dissolution rate reaches 20% is preferably selected.

[0065] Step 3: If the natural fracture is unfilled, inject 100m of slick water during fracturing. 3 Activate natural fractures; if the fillings in natural fractures are mainly calcium fillings after the whole rock and clay mineral composition analysis, then inject 100m of slick water during fracturing construction. 3 The natural fractures were activated and then 30 m3 of hydrochloric acid of experimentally determined concentration was injected. 3 , dissolve the calcium fillings in the natural fractures; if the fillings in the natural fractures are mainly silica fillings, inject 100m of slick water during fracturing construction. 3 Activate the natural fractures and then inject 30m3 of a mixture of hydrochloric acid and hydrofluoric acid of experimentally determined concentration. 3 , dissolving the siliceous fillings in natural fractures.

[0066] Step 4: Repeat step 3 and inject the slippery water and acid solution alternately twice, and then inject slippery water to carry 70 / 140 mesh high-strength powder pottery for 5m 3 , activate, dissolve and support natural fractures, high-strength proppants improve the conductivity of the fracture network system, and finally inject gel fracturing fluid to form the main fracture. Use the gel fracturing fluid to carry 40 / 70 mesh high-strength expanded clay to support artificial fractures, realize fracture network construction, and maximize the complexity of fractures.

[0067] Compared with similar technologies, in the previous practice of fracturing to increase the complexity of the fracture network, a method of alternately injecting low-viscosity fracturing fluid and high-viscosity fracturing fluid and combining it with large-volume pumping is generally used. Although this method has a certain effect on activating natural fractures at all levels, it is difficult to maximize the transformation and support of natural fractures with a high degree of filling by relying solely on hydraulic action. First, the present invention uses different process design methods to activate and transform natural fractures with different filling degrees; secondly, the main components of different fillings are specifically analyzed, and targeted acid systems and acid concentrations are used to dissolve the fillings in natural fractures, thereby communicating and supporting natural fractures, maximizing the transformation and utilization of natural fractures. At the same time, acid-rock chemistry can greatly reduce the strength of the rock, and is also conducive to significantly improving the complexity of the fracture network.

[0068] The process method of the present invention has high reliability and effectiveness, is used to guide on-site fracture network fracturing construction, has short operation time, reduces construction risks, and has low operating costs, and can provide a scientific basis for improving the fracture network fracturing process of ultra-deep fractured reservoirs. In the next few years, the output of deep-layer natural gas will account for more than 50% of the total output of CNPC, becoming an important replacement resource for CNPC's natural gas production. Therefore, there is a strong demand for fracture network fracturing and fracture network acidification transformation of fractured reservoirs. According to the deep layer, about 150 wells need to be fracturing and acidizing each year, guiding on-site fracture network transformation construction, improving the post-fracturing transformation effect, and guiding the optimization of adjacent well fracture network transformation, saving construction costs, and further improving the ultra-deep transformation effect. According to the optimization of guiding on-site fracture network transformation, the output after transformation is 2-3 times higher than that of adjacent wells, with significant economic benefits.

[0069] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0070] The example well KS131 is a pre-exploration well in the Kelasu structural zone of the Kuqa Depression. The well was drilled to a depth of 7792m and the target layer is the Cretaceous Bashiqiqik Formation. Imaging logging and core observations show that fractures are relatively developed, and leakage occurred during drilling. The transformation section has a large span of 7540-7624m. The fracture network fracturing transformation technology is used to form long artificial fractures with high conductivity, achieve effective communication with the fracture development zone, form a complex fracture network, and improve the single well production capacity.

[0071] Step 1: According to the results of geomechanical calculations, the maximum horizontal principal stress σ of the formation at 7540-7624 m in the reformed section of Well KS131 H is 204MPa, and the minimum horizontal principal stress δ h is 158MPa, pore pressure P p is 133.5MPa, when the density is 1.15g / cm 3 When the fracturing fluid and the fracturing string diameter are 88.9 mm, the static liquid column pressure P m It is 85.5MPa, so according to formula (2), G=51MPa can be calculated.

[0072] The fracture extension pressure gradient of the reformed section of Well KS131 is 2.2 MPa / 100 m, and the pressure gradient of 1.15 g / cm 3 Density calculation, at construction displacement 4.5m 3 / min, predict the total construction friction P F is 41.17MPa. At this time, the maximum construction pressure on the ground is P maxpump The pump pressure is about 124 MPa, as shown in Table 1. At this time, according to formula (3), the maximum pore pressure increment ΔP is obtained: max is 31.83MPa. Calculate the pore pressure P p The maximum increment of pore pressure ΔPmax The sum is 165.33MPa, which is greater than the minimum horizontal principal stress σ h Therefore, the estimated construction displacement is 4.5m 3 / min and maximum ground construction pressure P maxpump When the pump pressure reaches 124 MPa, the natural fractures can be sheared open, thus achieving the purpose of activating and communicating the natural fractures. Table 1 is the prediction table of the wellhead pressure during the fracturing operation of Well KS131.

[0073] Table 1

[0074]

[0075] Step 2: From the core observation and analysis of the ks131 well, it can be seen that the filling degree of the natural fracture is full filling. The filling material is sampled for whole rock and clay mineral composition analysis experiments. The experimental results are shown in Table 2. The quartz content is about 60%, and the main component of the filling material is siliceous filling. Therefore, the hydrochloric acid and hydrofluoric acid mixed acid solution dissolution rate experiment is evaluated. The dissolution experiment of the filling material when the concentration of hydrochloric acid and hydrofluoric acid mixed is 10% hydrochloric acid + (1.0%, 1.5%, 2.0%, 2.5%) hydrofluoric acid is carried out respectively. The experimental results are shown in Table 3. The acid dissolution rate of the filling material in the ksl31 well is 16.02% to 28.21%, so the selected acid system is 10% hydrochloric acid + 1.5% hydrofluoric acid. Table 2 is the X-ray diffraction whole rock analysis results of the filling material in the ks131 well. Table 3 is the dissolution rate determination results of the hydrochloric acid and hydrofluoric acid mixed acid solution in the ks131 well.

[0076] Table 2

[0077]

[0078]

[0079] Table 3

[0080]

[0081] Step 3: Since the filling material of natural fractures is mainly composed of siliceous filling, the displacement is slowly increased to 4.5m during fracturing construction. 3 / min, first inject 100m 3 Activate the natural fractures, then switch the fluid, keep the displacement constant, and inject 10% hydrochloric acid + 1.5% hydrofluoric acid for 30m 3 , and then inject 100m of slippery water in sequence 3 and 10% hydrochloric acid + 1.5% hydrofluoric acid 30m 3 , complete the injection of slick water and acid twice alternately to dissolve the siliceous fillings in the natural fractures.

[0082] Step 4: After the filling material in the natural fracture is dissolved, keep the displacement unchanged and then control the sand concentration to 60kg / m 3 , use slippery water to continuously carry sand and inject 70 / 140 mesh high-strength powder pottery 5m 3 , achieving the purpose of activating, dissolving and supporting natural fractures. Finally, inject 200m3 of gel fracturing fluid pre-fluid at the current displacement. 3 Create the main fracture, and then inject 400m3 of gel fracturing fluid and sand-carrying fluid 3 , carrying 40 / 70 mesh high strength ceramsite 78m 3 , sand concentration 180-360kg / m 3 , until the fracturing construction of the well is completed, the fracture network is constructed, and the complexity of the fractures is maximized.

[0083] The invention has achieved obvious results through field application. By implementing this technology, the seam network transformation was successfully realized. After the transformation, the spray test showed that the 9mm oil nozzle, oil pressure of 75MPa, and daily gas production of 74×10 4 m 3 / d, the open flow rate increased from 300,000 cubic meters to 2.5 million cubic meters, increasing production by 8 times, significantly improving the transformation effect. The microseismic monitoring results show that the transformation volume increased by 3.5 times compared with the previous transformation technology, achieving the purpose of increasing the complexity of the fractures. The microseismic monitoring results prove the effectiveness of the technology of the present invention, which will significantly improve the transformation volume and transformation effect of ultra-deep fractured reservoirs.

[0084] In the embodiment of the present invention, the natural fractures in the ultra-deep fractured reservoir are the main storage space and seepage channels, the degree of cementation and cementing materials of the natural fractures vary greatly, and the complexity of the fracture network formed by activating and connecting the natural fractures is proportional to the post-pressure production. In order to solve the problem that there is no targeted transformation process technology for natural fractures with different filling degrees and filling materials in ultra-deep fractured reservoirs, and the complexity of the fracture network formed by the existing natural fracture activation and transformation technology is relatively low, the solution of the embodiment of the present invention can improve the complexity of the fracture network of the fractured reservoir. The core of the present invention has four aspects: first, the construction displacement and construction pressure required for shearing and opening natural fractures are calculated; second, the filling degree of the fractures is analyzed according to core sampling to determine whether it is no filling, semi-filling or full filling, and the main component of the filling is analyzed to be siliceous filling or calcareous filling; third, if the natural fractures are not filled, slick water is used to activate the natural fractures; if the natural fractures are filled with calcareous filling, slick water is used to activate the natural fractures + different amounts of hydrochloric acid are used to fill or partially fill the natural fractures to dissolve and communicate; if the natural fractures are filled with siliceous filling, slick water is used to activate the natural fractures + different amounts of hydrochloric acid and hydrofluoric acid are used to fill or partially fill the natural fractures to dissolve and communicate; finally, slick water and acid are injected alternately, 70 / 140 mesh powdered pottery is added to activate, dissolve and support the natural fractures, high-strength proppants improve the conductivity of the fracture network system, and frozen gel sand is used to support artificial fractures to achieve fracture network construction and maximize the complexity of the fractures.

[0085] Embodiment 3

[0086] Figure 5 Schematic diagram of the structure of a device for processing the complexity of fracture network of fractured reservoirs provided in the third embodiment of the present invention. Figure 5 As shown, the device comprises:

[0087] The operating parameter determination module 310 is used to determine the target operating parameters of the volume fracturing device according to the mechanical parameters of the target reservoir and the selected operating parameters of the volume fracturing device; wherein the target operating parameters include the structural parameters of the fracturing pipe, the density parameters of the volume fracturing fluid and the operation displacement of the volume fracturing device;

[0088] A component parameter determination module 320 is used to determine the filling amount and filling composition of the filler in the fracture of the target reservoir, and determine the component parameters of the volume fracturing fluid according to the filling amount and the filling composition;

[0089] The target reservoir injection module 330 is used to control the volume fracturing device to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir based on the target operating parameters and the composition parameters, and to inject sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir.

[0090] The technical solution of the embodiment of the present invention determines the target operating parameters of the volume fracturing device according to the mechanical parameters of the target reservoir and the candidate operating parameters of the volume fracturing device; determines the filling amount and filling composition of the filler in the cracks of the target reservoir, and determines the composition parameters of the volume fracturing fluid according to the filling amount and filling composition; based on the target operating parameters and composition parameters, controls the volume fracturing device to inject volume fracturing fluid into the cracks of the target reservoir to dissolve the filler in the cracks of the target reservoir, and injects sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir. The problem of low degree of fracture transformation of ultra-deep fractured reservoirs by current technology is solved, and the transformation of natural fractures with different filling degrees and different fillings is realized, activating and communicating natural fractures to the greatest extent and improving the complexity of the fracture network.

[0091] Optionally, the operating parameter determination module 310 includes:

[0092] A pore pressure increment determination module, for calculating the pore pressure increment corresponding to the target reservoir based on the selected construction displacement, wellbore friction and a set value to be used corresponding to the volume fracturing device; wherein the set value to be used is determined based on the maximum horizontal principal stress, the minimum horizontal principal stress, the pore pressure and the hydrostatic column pressure of the target reservoir;

[0093] The target operating parameter determination module is used to determine the target operating parameters of the volume pressure device based on the pore pressure increment corresponding to the target reservoir, the pore pressure and the minimum horizontal principal stress.

[0094] Optionally, the target operating parameter determination module is specifically used to:

[0095] If the sum of the pore pressure increment and the pore pressure is greater than the minimum horizontal principal stress, the selected construction displacement, the fracturing pipe structural parameters associated with the wellbore friction resistance, and the volume fracturing fluid density parameters associated with the static liquid column pressure are used as the target operation parameters.

[0096] Optionally, the target operating parameter determination module is further used to:

[0097] If the sum of the pore pressure increment and the pore pressure is less than the minimum horizontal principal stress, at least one of the selected construction displacement, the fracturing pipe structure parameter and the density parameter is adjusted to make the sum of the pore pressure increment and the pore pressure greater than the minimum horizontal principal stress.

[0098] Optionally, the component parameter determination module 320 includes:

[0099] A sampling test module, used for taking core samples of the target reservoir to determine the filling amount of the filler in the cracks of the core; wherein the filling amount includes one of unfilled, partially filled and fully filled;

[0100] The method is used for conducting a component analysis experiment based on the filling in the cracks of the core, and determining the filling component of the filling in the cracks of the target reservoir based on the experimental results, wherein the filling component is one of siliceous filling and calcareous filling.

[0101] Optionally, the component parameter determination module 320 is further used to:

[0102] If the filling amount is no filling, determining that the composition of the volume of fracturing fluid is slick water;

[0103] If the filling amount is half filling or full filling, and the filling component is calcium filling, then the hydrochloric acid concentration corresponding to the calcium filling is determined based on the dissolution experiment, and the slick water and the hydrochloric acid concentration are determined as the component parameters of the volume fracturing fluid;

[0104] If the filling amount is half filling or full filling, and the filling component is siliceous filling, the concentration of the hydrochloric acid-hydrofluoric acid mixture corresponding to the siliceous filling is determined based on the dissolution experiment, and the concentrations of the slick water and the hydrochloric acid-hydrofluoric acid mixture are determined as the component parameters of the volume fracturing fluid.

[0105] Optionally, the component parameter determination module 320 includes:

[0106] The experimental module is used to dissolve the calcium fillings in the cracks of multiple core samples of the same material using hydrochloric acid liquids of different concentrations, and the concentration of the hydrochloric acid liquid when the dissolution rate reaches a preset dissolution rate is used as the hydrochloric acid concentration corresponding to the calcium filling.

[0107] Optionally, the target reservoir injection module 330 is specifically used to:

[0108] Controlling the operation of the volume fracturing device based on the target operating parameter to inject a volume of fracturing fluid corresponding to the composition parameter into the fractures of the target reservoir;

[0109] Fillings in the fractures of the target reservoir are dissolved based on the volume of fracturing fluid.

[0110] The device for processing the complexity of fractured reservoir network provided by the embodiment of the present invention can execute the method for processing the complexity of fractured reservoir network provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0111] Embodiment 4

[0112] Figure 6 is a schematic diagram of the structure of an electronic device provided according to Embodiment 4 of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0113] like Figure 6 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, ROM 12 and RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0114] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0115] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a method for processing the complexity of fracture network of fractured reservoirs.

[0116] In some embodiments, the method for processing the complexity of the fractured reservoir network may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for processing the complexity of the fractured reservoir network described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to execute the method for processing the complexity of the fractured reservoir network by any other appropriate means (e.g., by means of firmware).

[0117] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0118] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0119] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0120] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0121] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0122] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0123] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0124] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for processing the complexity of fracture network in fractured reservoirs, characterized in that: include: Determining target operating parameters of the volume fracturing device according to mechanical parameters of the target reservoir and candidate operating parameters of the volume fracturing device; wherein the target operating parameters include structural parameters of the fracturing pipe, density parameters of the volume fracturing fluid and the operation displacement of the volume fracturing device; Determining the filling amount and filling composition of the filler in the cracks of the target reservoir, and determining the composition parameters of the volume fracturing fluid according to the filling amount and the filling composition; Based on the target operating parameters and the composition parameters, the volume fracturing device is controlled to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir, and sand-carrying fracturing fluid is injected into the target reservoir to support the cracks in the target reservoir.

2. The method according to claim 1, characterized in that: The step of determining target operating parameters of the volume fracturing device according to the mechanical parameters of the target reservoir and the selected operating parameters of the volume fracturing device comprises: Based on the selected construction displacement, wellbore friction and the set value to be used corresponding to the volume fracturing device, the pore pressure increment corresponding to the target reservoir is calculated; wherein the set value to be used is determined based on the maximum horizontal principal stress, the minimum horizontal principal stress, the pore pressure and the hydrostatic column pressure of the target reservoir; The target operating parameters of the volume pressure device are determined based on the pore pressure increment corresponding to the target reservoir, the pore pressure and the minimum horizontal principal stress.

3. The method according to claim 2, characterized in that The step of determining the target operating parameters of the volume pressure device based on the pore pressure increment corresponding to the target reservoir, the pore pressure and the minimum horizontal principal stress comprises: If the sum of the pore pressure increment and the pore pressure is greater than the minimum horizontal principal stress, the selected construction displacement, the fracturing pipe structural parameters associated with the wellbore friction resistance, and the volume fracturing fluid density parameters associated with the static liquid column pressure are used as the target operation parameters.

4. The method according to claim 3, characterized in that Also includes: If the sum of the pore pressure increment and the pore pressure is less than the minimum horizontal principal stress, at least one of the selected construction displacement, the fracturing pipe structure parameter and the density parameter is adjusted to make the sum of the pore pressure increment and the pore pressure greater than the minimum horizontal principal stress.

5. The method according to claim 1, characterized in that The step of determining the filling amount and filling composition of the filling material in the fracture of the target reservoir comprises: Taking core samples of the target reservoir to determine the filling amount of the filler in the cracks of the core; wherein the filling amount includes one of unfilled, partially filled and fully filled; A component analysis experiment is performed based on the fillings in the cracks of the core, and the filling components of the fillings in the cracks of the target reservoir are determined based on the experimental results, wherein the filling component is one of siliceous filling and calcareous filling.

6. The method according to claim 5, characterized in that The step of determining the component parameters of the volume fracturing fluid according to the filling amount and the filling components comprises: If the filling amount is no filling, determining that the composition of the volume of fracturing fluid is slick water; If the filling amount is half filling or full filling, and the filling component is calcium filling, then the hydrochloric acid concentration corresponding to the calcium filling is determined based on the dissolution experiment, and the slick water and the hydrochloric acid concentration are determined as the component parameters of the volume fracturing fluid; If the filling amount is half filling or full filling, and the filling component is siliceous filling, the concentration of the hydrochloric acid-hydrofluoric acid mixture corresponding to the siliceous filling is determined based on the dissolution experiment, and the concentrations of the slick water and the hydrochloric acid-hydrofluoric acid mixture are determined as the component parameters of the volume fracturing fluid.

7. The method according to claim 6, characterized in that The method of determining the hydrochloric acid concentration corresponding to the calcium filling based on the dissolution experiment includes: For multiple core samples of the same material, hydrochloric acid liquid of different concentrations is used to dissolve the calcium fillings in the cracks of the core samples, and the concentration of the hydrochloric acid liquid when the dissolution rate reaches the preset dissolution rate is used as the hydrochloric acid concentration corresponding to the calcium filling.

8. The method according to claim 1, characterized in that The step of controlling the volume fracturing device to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the filler in the cracks of the target reservoir based on the target operating parameter and the component parameter includes: Controlling the operation of the volume fracturing device based on the target operating parameter to inject a volume of fracturing fluid corresponding to the composition parameter into the fractures of the target reservoir; Fillings in the fractures of the target reservoir are dissolved based on the volume of fracturing fluid.

9. A device for processing the complexity of fracture network in fractured reservoirs, characterized in that: include: An operating parameter determination module, used to determine target operating parameters of the volume fracturing device according to mechanical parameters of the target reservoir and selected operating parameters of the volume fracturing device; wherein the target operating parameters include structural parameters of the fracturing pipe, density parameters of the volume fracturing fluid and the operation displacement of the volume fracturing device; A component parameter determination module, used to determine the filling amount and filling composition of the filler in the cracks of the target reservoir, and determine the component parameters of the volume fracturing fluid according to the filling amount and the filling composition; The target reservoir injection module is used to control the volume fracturing device to inject the volume fracturing fluid into the cracks of the target reservoir to dissolve the fillers in the cracks of the target reservoir based on the target operating parameters and the composition parameters, and to inject sand-carrying fracturing fluid into the target reservoir to support the cracks in the target reservoir.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for processing the complexity of the fracture network of a fractured reservoir as described in any one of claims 1-8.

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