A method for optimizing and implementing parameters of multi-cluster staged fracturing in long horizontal wells

Abstract

The present invention discloses a method for optimizing and implementing parameters of multi-cluster graded fracturing in a long section of a horizontal well, which belongs to the technical field of hydraulic fracturing in unconventional oil and gas reservoirs, and comprises the following steps: Step 1, based on the principle of balancing the interference effect of stress between fractures, design the number of graded fracturing stages and the number of temporary plugging times within the section; Step 2, based on the principle of step-by-step opening of multi-stage fracturing cracks and balanced expansion of multiple clusters of cracks during each stage of fracturing, design the perforation parameters of each stage of fracturing; Step 3, based on the principle of the same amount of liquid inflow to each cluster of cracks, determine the graded temporary plugging time and the amount of temporary plugging agent; Step 4, carry out on-site construction according to the optimized construction parameters. The method of the present invention can realize the synchronous opening and balanced expansion of multiple clusters of hydraulic fractures in a long fracturing section of a horizontal well, overcome the defect that the prior art is difficult to apply due to the excessive number of perforation clusters in the fracturing section, reduce the cost of fracturing operations and effectively increase the production of oil and gas wells.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic fracturing of unconventional oil and gas reservoirs, and in particular relates to a method for optimizing and implementing parameters of long-section multi-cluster staged fracturing of horizontal wells. Background Art

[0002] Horizontal well multi-cluster fracturing is a primary method for shale oil and gas resource development and is widely used for shale reservoir stimulation. Due to factors such as inter-fracture stress interference and reservoir heterogeneity, multi-cluster hydraulic fractures within the same fracturing stage are difficult to initiate and propagate synchronously during horizontal well multi-cluster fracturing, resulting in poor stimulation effectiveness and limiting the efficient improvement of oil and gas well productivity.

[0003] In horizontal well fracturing design, the number of fracturing stages and perforation clusters are key design parameters, directly impacting both fracturing effectiveness and cost. A rational cluster design maximizes reservoir production potential, reduces input-output ratios, and achieves optimal economic benefits. Long-stage, multi-cluster fracturing technology for horizontal wells reduces construction costs by increasing the fracturing stage length and reducing the number of stages. However, increasing the number of perforation clusters within a fracturing stage exacerbates the uneven development of multiple fracture clusters.

[0004] Currently, the main methods for promoting the balanced development of multiple fracture clusters include perforation flow restriction and temporary plugging and diversion. For conventional horizontal well staged multi-cluster fracturing, both methods can achieve some success when the number of perforation clusters within a single fracturing stage is small (less than 10). However, in long-stage multi-cluster fracturing, the excessive number of perforation clusters within a single stage (greater than 10) further increases the difficulty of achieving the simultaneous opening and balanced expansion of multiple hydraulic fractures, rendering these two methods inadequate. Consequently, an effective optimization design approach is urgently needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for optimizing and implementing multi-cluster staged fracturing parameters in a long section of a horizontal well, so as to achieve synchronous opening and balanced expansion of multiple cluster hydraulic fractures in a long fracturing section, and provide guidance for multi-cluster fracturing construction in a long section of a horizontal well.

[0006] To achieve the above objectives, the present invention provides a method for optimizing and implementing parameters for multi-cluster staged fracturing in a long horizontal well, comprising the following steps:

[0007] Step 1: Based on the principle of balancing the stress interference between fractures, design the number of staged fracturing and temporary plugging times within the section;

[0008] Step 2: Based on the principle of gradual opening of multi-stage fracturing cracks and balanced expansion of multiple clusters of cracks during each stage of fracturing, the perforation parameters of each stage of fracturing are designed;

[0009] Step 3: Based on the principle that the fluid inflow of each fracture cluster is the same and the fracturing and perforation clusters of each level are opened in sequence, the temporary plugging time and the amount of temporary plugging agent are determined;

[0010] Step 4: Carry out on-site construction according to the optimized construction parameters.

[0011] Preferably, in step 1, it is ensured that the perforation clusters of each stage are staggered during staged fracturing of the target fracturing section, and the distance between adjacent perforation clusters in each stage is not less than 10 m but not more than 20 m. The calculation formula for the number of staged fracturing stages and the number of temporary plugging times within the section is as follows:

[0012]

[0013] Where: N j is the number of staged fracturing stages in the target fracturing section (rounded up), dimensionless; N is the number of perforation clusters per stage, which is recommended to be no more than 4 clusters, dimensionless; N T is the total number of perforation clusters in the fracturing section, dimensionless; N d is the number of temporary plugging times, dimensionless; L is the length of the fracturing section, m; d is the perforation cluster spacing of each fracturing stage (10≤d≤20), m.

[0014] Preferably, the calculation process of the perforation parameters at each level in step 2 is as follows:

[0015] S21. Considering the interference effect of induced stress between fractures, calculate the perforation parameters of each perforation cluster in the first stage of fracturing. The specific process is as follows:

[0016] First, the net pressure in a single hydraulic fracture is calculated based on the analytical solution of the PKN hydraulic fracture model:

[0017]

[0018] Secondly, calculate the interference intensity of the induced stress between fractures when multiple clusters of fractures expand synchronously during the first-stage fracturing:

[0019]

[0020] Where: p is the net pressure in a single hydraulic fracture, MPa; Δp s is the inter-fracture induced stress interference intensity value, MPa; E is the static Young's modulus, MPa; μ is the viscosity, mPa·s; Q is the injection displacement, m3 / min; N is the number of perforation clusters corresponding to the first stage fracturing, dimensionless; υ is the Poisson's ratio, dimensionless; h r is the hydraulic fracture height, m;

[0021] Finally, considering the effect of friction resistance of perforations to balance the induced stress interference between fractures, the number of perforations required for balanced development of multiple clusters of fractures in the first stage of fracturing is calculated:

[0022]

[0023] Where: n p1 is the number of perforations in each perforation cluster of the first stage fracturing, dimensionless; ρ s is the density of fracturing fluid, kg / m 3 ;d p is the perforation hole diameter, m; K d is the perforation flow coefficient, which reflects the influence of the shape of the perforation entrance on the flow of fracturing fluid and perforation friction, and its value range is 0.5-0.95, dimensionless; i is the i-th fracturing stage, dimensionless;

[0024] S22. Taking into account the superposition of the induced stresses between the first two hydraulic fractures and the constraint that the second-stage perforation clusters are not opened during the initiation and expansion of the first-stage perforation clusters (the frictional resistance and pressure drop of the second-stage perforations should be higher than that of the first-stage perforations), calculate the number of perforations for the second-stage fracturing:

[0025]

[0026] Where: n p2 is the number of perforations in each perforation cluster of the second-stage fracturing, dimensionless; α is the difference between the frictional pressure drop of the second-stage perforations and the frictional pressure drop of the first-stage perforations, which is determined based on the experience of the target work area and is usually 5 MPa;

[0027] S23. Calculate the perforation parameters of the third and subsequent fracturing stages in the same way:

[0028]

[0029] Where: n pi is the number of perforations in each perforation cluster of the i-th stage fracturing, dimensionless;

[0030] S24: The number of perforations in the last level perforation cluster must be no less than 2. Otherwise, return to step 1 and reduce the number of levels to recalculate.

[0031] Preferably, the process for calculating the graded temporary plugging time and the temporary plugging agent dosage in step 3 is as follows:

[0032] S31. Based on the principle that the amount of liquid flowing into each cluster of fractures is the same, calculate the temporary plugging time at each level:

[0033]

[0034] Where, t j is the construction time of the jth level temporary blockage, min; T is the total construction time, min; N j is the number of perforation clusters corresponding to the j-th level of fracturing, dimensionless;

[0035] S32. Based on the principle of sequential opening of each level of fracturing perforation clusters, that is, after temporary plugging, all cracks opened by the previous level of fracturing are guaranteed to be plugged, and each level of perforation clusters of the next level of fracturing can be effectively opened, the calculation formula for the temporary plugging agent dosage is as follows:

[0036]

[0037] The calculation formula for the seam width is as follows:

[0038]

[0039] Where m is the dosage of temporary plugging agent, kg; λ is the concentration of temporary plugging agent per unit seam height section, which can be measured by indoor experiments, kg / m 2 ;w is the width of the crack in the temporary plugging section, m; is the concentration retention rate, which is dimensionless and ranges from 70% to 90% based on engineering experience; n is the number of fracture clusters that need to be temporarily plugged; C L is the filtration coefficient, m / min 0.5 .

[0040] Preferably, in step 4, on-site construction is carried out according to the optimized construction parameters.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] This method promotes the progressive initiation of hydraulic fractures within long fracturing stages by differentially setting perforation parameters for each cluster and repeatedly injecting temporary plugging agents. Further optimization of perforation parameters for clusters activated at the same stage ensures balanced expansion of multiple hydraulic fractures within that stage. Ultimately, this method achieves the simultaneous initiation and balanced expansion of multiple hydraulic fractures within a long fracturing stage in horizontal wells, overcoming the limitations of existing technologies due to the excessive number of perforation clusters within a fracturing stage. This reduces fracturing operation costs and effectively improves the effectiveness of fracturing stimulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is an overall flow chart of a method for optimizing and implementing parameters of multi-cluster staged fracturing in a long section of a horizontal well according to the present invention. DETAILED DESCRIPTION

[0044] The following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0045] like Figure 1As shown in the figure, in step 1, it is ensured that the perforation clusters of each stage are staggered during staged fracturing of the target fracturing section, and the distance between adjacent perforation clusters in each stage is not less than 10m but not more than 20m. The calculation formula for the number of staged fracturing stages and the number of temporary plugging times in the section is as follows:

[0046]

[0047] Where: N j is the number of staged fracturing stages in the target fracturing section (rounded up), dimensionless; N is the number of perforation clusters per stage, which is recommended to be no more than 4 clusters, dimensionless; N T is the total number of perforation clusters in the fracturing section, dimensionless; N d is the number of temporary plugging times, dimensionless; L is the length of the fracturing section, m; d is the perforation cluster spacing of each fracturing stage (10≤d≤20), m.

[0048] The calculation process of perforation parameters at each level in step 2 is as follows:

[0049] S21. Considering the interference effect of induced stress between fractures, calculate the perforation parameters of each perforation cluster in the first stage of fracturing. The specific process is as follows:

[0050] First, the net pressure in a single hydraulic fracture is calculated based on the analytical solution of the PKN hydraulic fracture model:

[0051]

[0052] Secondly, calculate the interference intensity of the induced stress between fractures when multiple clusters of fractures expand synchronously during the first-stage fracturing:

[0053]

[0054] Where: p is the net pressure in a single hydraulic fracture, MPa; Δp s is the inter-fracture induced stress interference intensity value, MPa; E is the static Young's modulus, MPa; μ is the viscosity, mPa·s; Q is the injection displacement, m3 / min; N is the number of perforation clusters corresponding to the first stage fracturing, dimensionless; υ is the Poisson's ratio, dimensionless; h r is the hydraulic fracture height, m;

[0055] Finally, considering the effect of friction resistance of perforations to balance the induced stress interference between fractures, the number of perforations required for balanced development of multiple clusters of fractures in the first stage of fracturing is calculated:

[0056]

[0057] Where: n p1 is the number of perforations in each perforation cluster of the first stage fracturing, dimensionless; ρ s is the density of fracturing fluid, kg / m 3 ;d p is the perforation hole diameter, m; Kd is the perforation flow coefficient, which reflects the influence of the shape of the perforation entrance on the flow of fracturing fluid and perforation friction, with a value range of 0.5 to 0.95 and dimensionless; i is the i-th fracturing stage number and dimensionless;

[0058] S22. Taking into account the superposition of the induced stresses between the first two hydraulic fractures and the constraint that the second-stage perforation clusters are not opened during the initiation and expansion of the first-stage perforation clusters (the frictional resistance and pressure drop of the second-stage perforations should be higher than that of the first-stage perforations), calculate the number of perforations for the second-stage fracturing:

[0059]

[0060] Where: n p2 is the number of perforations in each perforation cluster of the second-stage fracturing, dimensionless; α is the difference between the frictional pressure drop of the second-stage perforations and the frictional pressure drop of the first-stage perforations, which is determined based on the experience of the target work area and is usually 5 MPa;

[0061] S23. Calculate the perforation parameters of the third and subsequent fracturing stages in the same way:

[0062]

[0063] Where: n pi is the number of perforations in each perforation cluster of the i-th stage fracturing, dimensionless;

[0064] S24: The number of perforations in the last level perforation cluster must be no less than 2. Otherwise, return to step 1 and reduce the number of levels to recalculate.

[0065] The process for calculating the graded temporary plugging time and temporary plugging agent dosage in step 3 is as follows:

[0066] S31. Based on the principle that the amount of liquid flowing into each cluster of fractures is the same, calculate the temporary plugging time at each level:

[0067]

[0068] Where, t j is the construction time of the jth level temporary blockage, min; T is the total construction time, min; N j is the number of perforation clusters corresponding to the j-th level of fracturing, dimensionless;

[0069] S32. Based on the principle of sequential opening of each level of fracturing perforation clusters, that is, after temporary plugging, all cracks opened by the previous level of fracturing are guaranteed to be plugged, and each level of perforation clusters of the next level of fracturing can be effectively opened, the calculation formula for the temporary plugging agent dosage is as follows:

[0070]

[0071] The calculation formula for the seam width is as follows:

[0072]

[0073] Where m is the dosage of temporary plugging agent, kg; λ is the concentration of temporary plugging agent per unit seam height section, which can be measured by indoor experiments, kg / m 2 ;w is the width of the crack in the temporary plugging section, m; is the concentration retention rate, which is dimensionless and ranges from 70% to 90% based on engineering experience; n is the number of fracture clusters that need to be temporarily plugged; C L is the filtration coefficient, m / min 0.5 .

[0074] In step 4, on-site construction is carried out according to the optimized construction parameters.

[0075] Taking the horizontal well section of shale oil in a certain area as an example, the construction parameters of this section are shown in Table 1 below:

[0076] Table 1 Construction parameters

[0077] Parameter Type Value Parameter Type Value <![CDATA[Construction displacement (m 3 / min)]]> 16 Hydraulic fracture height (m) 30 Fracturing fluid viscosity (mPa·s) 5 <![CDATA[Fracturing fluid density (kg / m 3 )]]> 1050 Young's modulus (MPa) 30000 Hole flow coefficient 0.95 Total construction time (min) 120 Poisson's ratio (dimensionless) 0.2 Initial perforation diameter (m) 0.01 Fracturing section length (m) 60 Number of perforation clusters within the segment 12 <![CDATA[Temporary plugging agent plugging concentration (kg·m -2 )]]> 200 Crack height (m) 30 Temporary plugging agent concentration retention rate 85％ <![CDATA[Filter loss coefficient (m / min 0.5 )]]> <![CDATA[1×10 -4 ]]>

[0078] The specific process is as follows:

[0079] Step 1: According to the on-site construction data of the target well section, the number of staged fracturing stages and the number of temporary plugging times in the target fracturing section are calculated, and the designed fracturing mode is implemented. According to formula (1), the number of staged fracturing stages and the number of temporary plugging times in the section are calculated to be 3 and 2, respectively.

[0080] Step 2: According to formula (2) and formula (3), the data in the construction parameter table are substituted into the calculation. The net pressure of the first-stage hydraulic fracturing crack is 1.35 MPa, and the induced stress difference between the first-stage multi-cluster cracks is 0.44 MPa. According to formulas (4)-(6), the first-stage hydraulic fracturing multi-cluster cracks are used as the reference cluster, and the initial perforation number of the reference cluster is set to 12. The perforation numbers for the second-stage and third-stage hydraulic fracturing multi-cluster cracks to initiate fractures step by step and ensure balanced development of the fractures are 8 and 6, respectively.

[0081] Step 3: According to formula (7), the temporary plugging time for the first and second stages in the section is calculated to be 40 minutes and 80 minutes respectively. The concentration retention rate of the temporary plugging agent in the target section after it is injected into the wellhead and migrated into the fracture through the wellbore is 85%. According to formula (9), the fracture width is calculated to be 5.3 mm. According to formula (8), the amount of temporary plugging agent for each stage is calculated to be 233 kg.

[0082] Step 4: Perform staged temporary plugging and fracturing transformation on the target well section according to the recommended fracturing scheme. The first temporary plugging operation is performed when the construction time is 40 minutes, and the temporary plugging agent dosage is 233 kg, and then the second-level cracks are fracturing. The second temporary plugging operation is performed when the construction time is 80 minutes, and the temporary plugging agent dosage is 233 kg, and then the third-level cracks are fracturing.

[0083] Microseismic monitoring results show that after the fracturing treatment, the well exhibited better balanced opening and expansion of multiple hydraulic fractures compared to adjacent wells fractured using conventional methods. The post-fracture production increased to 1.6 times that of adjacent wells, demonstrating the beneficial effects and engineering application value of the proposed method.

[0084] Therefore, the present invention employs the aforementioned method for optimizing and implementing parameters for long-segment, multi-cluster, staged fracturing in horizontal wells. Compared to traditional perforating technology, its core advantage lies in its integrated use of perforation flow restriction and temporary plugging and diversion techniques. This method considers factors such as stress interference between fractures within a segment and perforation friction and pressure drop. This allows for the design of perforation and temporary plugging parameters, enabling precise optimization of the fracturing scheme. This method enables the gradual opening of long-segment, multi-cluster fractures and improves fracture expansion balance. This method also reduces costs and maximizes benefits.

[0085] The above is only an embodiment of the present invention, and common knowledge such as the specific structure and / or characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for optimizing and implementing parameters of multi-cluster staged fracturing in long horizontal wells, characterized in that: The following steps are involved: Step 1: Based on the principle of balancing the stress interference between fractures, design the number of staged fracturing and temporary plugging times within the section; Step 2: Based on the principle of gradual opening of multi-stage fracturing cracks and balanced expansion of multiple clusters of cracks during each stage of fracturing, the perforation parameters of each stage of fracturing are designed; The calculation process of perforation parameters at each level in step 2 is as follows: S21. Considering the interference effect of induced stress between fractures, calculate the perforation parameters of each perforation cluster in the first stage of fracturing. The specific process is as follows: First, the net pressure in a single hydraulic fracture is calculated based on the analytical solution of the PKN hydraulic fracture model; Secondly, the interference intensity of induced stress between fractures is calculated when multiple fracture clusters expand synchronously during the first stage of fracturing. Finally, the perforation number required for balanced development of multiple fracture clusters in the first stage of hydraulic fracturing was calculated by taking into account the effect of friction resistance of perforations to balance the induced stress interference between fractures. S22. Calculate the number of perforations for the second stage of fracturing, taking into account the superposition of the induced stresses between the first two stages of hydraulic fractures and the constraint that the second stage perforation clusters are not opened during the initiation and expansion of the first stage perforation clusters (the frictional resistance and pressure drop of the second stage perforations should be higher than that of the first stage perforations); S23. Calculate the perforation parameters of the third and subsequent fracturing stages in the same way: S24, the number of perforations in the last level perforation cluster is required to be no less than 2, otherwise return to step 1 and reduce the number of levels to recalculate; Step 3: Based on the principle that the amount of liquid inflow into each cluster of fractures is the same, determine the graded temporary plugging time and temporary plugging agent dosage; The process for calculating the graded temporary plugging time and temporary plugging agent dosage in step 3 is as follows: S31. Based on the principle that the amount of liquid flowing into each cluster of fractures is the same, calculate the temporary plugging time at each level; S32, based on the principle of sequential opening of each level of fracturing perforation clusters, that is, after temporary plugging, ensuring that all cracks opened by the previous level of fracturing are plugged, and each level of perforation clusters of the next level of fracturing can be effectively opened; Step 4: Carry out on-site construction according to the optimized construction parameters.

2. A method for optimizing and implementing parameters for long-section multi-cluster staged fracturing of horizontal wells according to claim 1, characterized in that: In step 1, ensure that the perforation clusters of each level are staggered during staged fracturing of the target fracturing section, and the distance between adjacent perforation clusters in each level is not less than 10m but not more than 20m. The calculation formula for the number of staged fracturing stages and temporary plugging times within the section is as follows: Where: N j is the number of staged fracturing stages in the target fracturing section (rounded up), dimensionless; N is the number of perforation clusters per stage, which is recommended to be no more than 4 clusters, dimensionless; N T is the total number of perforation clusters in the fracturing section, dimensionless; N d is the number of temporary plugging times, dimensionless; L is the length of the fracturing section, m; d is the perforation cluster spacing of each stage of fracturing (10≤d≤20), m.

3. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: In step 2, the net pressure formula in a single hydraulic fracture is solved based on the analytical solution of the PKN hydraulic fracture model as follows: 。 4. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: In step 2, the formula for calculating the interference intensity of the induced stress between fractures during the synchronous expansion of multiple clusters of fractures during the first stage of fracturing is as follows: Where: p is the net pressure in a single hydraulic fracture, MPa; Δp s is the inter-fracture induced stress interference intensity value, MPa; E is the static Young's modulus, MPa; μ is the viscosity, mPa·s; Q is the injection displacement, m3 / min; N is the number of perforation clusters corresponding to the first stage fracturing, dimensionless; υ is the Poisson's ratio, dimensionless; h r is the height of hydraulic fracture, m.

5. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: The formula for calculating the number of perforations required for balanced development of multiple clusters of fractures in the first-stage fracturing in step 2 is as follows: Where: n p1 is the number of perforations in each perforation cluster of the first stage fracturing, dimensionless; ρ s is the density of fracturing fluid, kg / m 3 ;d p is the perforation hole diameter, m; K d is the perforation flow coefficient, which reflects the influence of the shape of the perforation entrance on the flow of fracturing fluid and perforation friction, with a value range of 0.5 to 0.95 and dimensionless; i is the i-th fracturing stage number and is dimensionless.

6. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: The formula for calculating the number of perforations for the second-stage fracturing in step 2 is as follows: Where: n p2 is the number of perforations in each perforation cluster of the second-stage fracturing, which is dimensionless; α is the difference between the frictional pressure drop of the second-stage perforations and the frictional pressure drop of the first-stage perforations, which is determined based on the experience of the target work area and is usually 5 MPa.

7. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: The formula for calculating the perforation parameters for the third and subsequent fracturing stages in step 2 is as follows: Where: n pi is the number of perforations in each perforation cluster of the i-th level fracturing, dimensionless.

8. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: The formula for calculating the temporary congestion time at each level in step 3 is as follows: Where, t j is the construction time of the jth level temporary blockage, min; T is the total construction time, min; N j is the number of perforation clusters corresponding to the j-th level fracturing, dimensionless.

9. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: The calculation formula for the temporary plugging agent dosage in step 3 is as follows: The calculation formula for the seam width is as follows: Where m is the dosage of temporary plugging agent, kg; λ is the concentration of temporary plugging agent per unit seam height section, which can be measured by indoor experiments, kg / m 2 ; w is the width of the crack in the temporary plugging section, m; is the concentration retention rate, which is dimensionless and ranges from 70% to 90% based on engineering experience; n is the number of fracture clusters that need to be temporarily plugged; C L is the filtration coefficient, m / min 0.5 .

10. The method for optimizing and implementing parameters of long-section multi-cluster staged fracturing in horizontal wells according to claim 1, characterized in that: In step 4, on-site construction is carried out according to the optimized construction parameters.

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