Perforation well completion method capable of improving water drive well pattern encryption and capacity adjustment

Abstract

The invention relates to the field of reservoir engineering, and discloses a perforation well completion method capable of improving water drive well pattern densification adjustment productivity, which comprises the following steps: step 1, based on the understanding of the distribution law of remaining oil before water drive well pattern densification adjustment, further analyzing the flooding degree of each new well, each oil layer and in the layer after drilling of the new wells, and determining the density of the remaining oil; and meanwhile, in combination with the position of the single well in the original well pattern and the water absorption and utilization data of the old well, an oil layer with low water content and rich remaining oil is opened through jetting, and meanwhile, wells with relatively concentrated thin difference layers in the longitudinal direction are fractured through a flow limiting method, so that interlayer contradictions are reduced, and the single well productivity is improved. The purpose of using a thin and poor oil layer is achieved through fracturing by a flow limiting method, and a fracturing measure is adopted for a low-permeability and low-water-content oil layer to improve the liquid production capacity, so that interlayer contradiction is reduced, and efficient and economic development of an oil field is achieved.

Description

Technical Field

[0001] The present invention relates to the field of reservoir engineering, and specifically to a perforating completion method that can improve the productivity of waterflood well pattern infill adjustment. Background Art

[0002] Waterflood development is a common oilfield production method, in which water is injected into the oil reservoir to maintain formation pressure, and the crude oil in the oil reservoir is driven to flow towards the production well by the injected water. The well pattern refers to the layout of injection and production wells in the oilfield, which is used for oil production and water injection. Well pattern infill means adding more injection and production wells to the existing well pattern, which can improve the degree of well pattern control and thus increase the recovery factor. By means of perforating completion to improve the degree of well pattern control, and then increase the oil production rate, so as to achieve the purpose of increasing the ultimate recovery factor of the oilfield.

[0003] The currently adopted methods are divided into two types. One is that the perforating targets are the same as the old wells in the original well pattern, and the other is that the entire production interval is perforated. With the in-depth development of the oilfield, the distribution of remaining oil underground is more scattered, and the contradictions between planes, layers, and within layers are more prominent, and the phenomenon of inefficient and ineffective circulation is prominent. Therefore, a perforating completion method that can improve the productivity of waterflood well pattern infill adjustment is proposed. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a perforating completion method that can improve the productivity of waterflood well pattern infill adjustment, and solves the problems in the prior art that with the in-depth development of the oilfield, the distribution of remaining oil underground is more scattered, the contradictions between planes, layers, and within layers are more prominent, and the phenomenon of inefficient and ineffective circulation is prominent.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A perforating completion method that can improve the productivity of waterflood well pattern infill adjustment, including the following steps: Step 1: Based on the understanding of the remaining oil distribution law before waterflood well pattern infill adjustment, after the new well is drilled, further analyze the water flooding degree of each new well, each oil layer and within the layer, and at the same time combine the position of the single well in the original well pattern and the water absorption and production data of the old wells. By perforating the oil layers with low water cut and rich remaining oil, and at the same time adopting the limited-entry fracturing method for the wells with relatively concentrated thin and poor layers in the vertical direction to reduce the interlayer contradiction and improve the productivity of a single well; Step 2: Based on the understanding of the remaining oil distribution law before waterflood well pattern infill adjustment, after the first perforation, when the water cut and permeability of the perforated layer are equivalent to those of the unperforated oil layer, supplement the perforation of the unperforated oil layer to exploit the remaining oil in this part of the oil layer.

[0006] Preferably, the understanding of the remaining oil distribution law in Step 1 includes: Collect and sort out the geological data related to the waterflood oilfield; Analyze the remaining oil distribution law of each oil layer based on the collected geological data; Analyze the water flooding effect, that is, how water moves in the underground reservoir and interacts with crude oil. By simulating the water flooding effect, confirm which oil layers have a high degree of water flooding and which oil layers are rich in remaining oil; Combined with the core data, use the core well data of this block and similar blocks to analyze the remaining oil distribution law and determine the perforation targets; Based on the geological data and water flooding effect analysis, evaluate the distribution of remaining oil in different oil layers; Combined with the original well pattern, the oil layers that cannot be controlled by the original well pattern are used as perforation targets, and the thick oil layers with good exploitation in the original well pattern and the medium and low water-flooded parts with unstable internal interlayers in the thick oil layers are not used as perforation targets.

[0007] Preferably, before perforating the oil layer in step one, it is necessary to consider the oil layer development status, oil layer connectivity status, interlayer development status, fault distribution status, and oil layer utilization status. Based on the geological analysis results, design the completion method and perforation strategy, including the perforated layer, depth, angle, and interlayer.

[0008] Preferably, the steps of perforating the oil layer with low water cut and rich remaining oil in step one include the following: Select an appropriate perforating tool, which should be determined according to the wellhead equipment and formation properties; Formulate a perforating operation plan to ensure that the perforating operation is safe, controllable, and compliant with the specifications and operation procedures; Carry out the perforating operation, execute it according to the predetermined plan, and after the perforating is completed, monitor the production situation of the well to verify the effect of the perforating operation.

[0009] Preferably, the steps of perforating the unperforated oil layer in step two include the following: According to the relationship between the water cut after the new well is put into production and the water saturation of the perforated oil layer, calculate the water cut level after these unperforated oil layers are perforated based on the water saturation situation of the unperforated oil layers. At the same time, use the relationship between the dynamic permeability in the pressure measurement interpretation results and the permeability of the perforated oil layers. When the water cut level of the exploited oil layer is close to that of the unperforated oil layer and the permeability of the unperforated oil layer is close to the dynamic permeability, determine to perforate the unperforated layer; Evaluate the impact of the water flooding effect on the unperforated oil layer, including the water invasion speed, the contact degree between water and remaining oil, and the impact of water on the oil layer properties; When it is determined that the unperforated oil layer needs to be perforated, a detailed perforating plan needs to be formulated and the perforating operation needs to be carried out subsequently; After the perforating operation is completed, closely monitor the production situation of the well to verify the effect of the perforating operation.

[0010] Preferably, the steps of taking fracturing measures in step one include the following: Based on the logging interpretation result data, combined with dynamic data and the position in the old well pattern, determine which oil layers are suitable for limited-entry fracturing completion. For wells with relatively concentrated thin and poor layers vertically, conduct fracturing. At the same time, segment according to the oil layer thickness and the thickness of the interlayer between layers to provide basic data for fracturing design; Based on the acoustic variable density logging, determine whether the cementing quality meets the fracturing requirements. The fracturing isolation layer is required to have a cementing coefficient of more than 0.8; Prepare an operation guide for limited-entry fracturing according to the designed fracturing horizons, arrange the hole depths of the fracturing horizons, and prepare a formal geological plan for limited-entry fracturing; Design the composition of the fracturing fluid according to the results of the analysis of the limited-entry fracturing geological plan, and determine the range of injection pressure, its variation law, the total displacement of the fracturing fluid, and the injection rate; Install downhole fracturing tools, including fracturing pipes and perforating guns. Inject the pre-prepared fracturing fluid into the wellbore, push the fracturing fluid to the target oil layer through the fracturing pipe, apply high pressure to make the fracturing fluid enter the oil layer, generate fractures, and improve the permeability of the oil layer.

[0011] Preferably, reducing the interlayer contradiction in the first step includes the following steps: Before perforating and fracturing design, based on the dynamic production data of the original well pattern and the logging interpretation watered-out layer data after the new well is drilled, conduct a comprehensive and integrated analysis and research, summarize the development law, determine the remaining oil potential oil layers and the difficulty of driving the potential oil layers, and then determine which part of the oil layer to perforate to reduce the interlayer contradiction; Through data analysis and numerical simulation, simulate and predict the permeability, pressure, oil-water distribution, etc. of different oil layers; According to the interpretation data of the core well data, combined with the location of the core well in the original well pattern, analyze the difficulty of driving different oil layers, and make a good choice of the perforated oil layer to reduce the interlayer interference and achieve the purpose of efficient development.

[0012] Preferably, when recompleting the unperforated oil layer in the second step, it is necessary to ensure the balance of water cut between the perforated layer and the developed oil layer, specifically including: Determine the water cut before and after recompleting the unperforated oil layer. By monitoring and analyzing data, master the change of water content in the perforated oil layer and the unperforated oil layer to ensure that they are equivalent when recompleting; Consider parameters such as the water drive effect and water permeability of the unperforated oil layer, and compare them with the perforated oil layer to ensure that they are similar or equal; Conduct numerical simulation and prediction analysis to infer the water drive effect and permeability change after recompleting the unperforated oil layer, and coordinate and balance with the perforated oil layer.

[0013] Preferably, when recompleting the unperforated oil layer in the second step, it is also necessary to ensure the permeability balance, specifically including: Determine the permeability change before and after perforating the unperforated oil layers, and analyze the permeability difference between the perforated oil layers and the unperforated oil layers through geological data, downhole logging and other information; Consider the water flooding effect, formation rock properties and oil layer porosity factors, and adjust the perforation design when perforating the unperforated oil layers to make it match or approach the permeability of the perforated oil layers; Carry out simulation and prediction analysis to evaluate the permeability change after perforating the unperforated oil layers, avoid excessive permeability difference, and maintain the balanced production capacity of the overall water flooding well pattern.

[0014] The present invention provides a perforating completion method that can improve the production capacity of the water flooding well pattern encryption adjustment. It has the following beneficial effects: By using the coring well data of this block and similar blocks, the present invention analyzes the remaining oil distribution, determines the perforation targets, and combines with the original well pattern. The oil layers that cannot be controlled by the original well pattern are used as perforation targets, and the thick oil layers with good production in the original well pattern and the medium and low water flooded parts with unstable internal interlayers in the thick oil layers are not used as perforation targets. And when the water cut of the perforated layer reaches the water cut level of the unperforated oil layer, the unperforated oil layer is perforated to ensure that the scattered and planar remaining oil underground can be exploited to the maximum extent and the production can be increased.

[0015] By combining with limited entry fracturing, the present invention selects thin and poor layers in combination with the limited entry fracturing method. For those with relatively concentrated thin and poor layers in the vertical direction, the limited entry fracturing method is used to achieve the goal of mobilizing the oil layers, and fracturing measures are taken for low-permeability and low-water-cut oil layers to improve the liquid production capacity, so as to reduce the interlayer contradiction and realize efficient cyclic production, and further increase the production. Brief Description of the Drawings

[0016] Figure 1 It is a flow chart of the present invention Figure 2 It is a preferred perforation layer diagram combined with a coring well in the second embodiment of the present invention; Figure 3 It is a preferred perforation layer diagram combined with the old well pattern in the second embodiment of the present invention; Figure 4 It is a diagram of avoiding perforating the medium and low water flooded parts with unstable internal interlayers in thick oil layers in the second embodiment of the present invention; Figure 5 It is a preferred layer diagram combined with the limited entry fracturing method in the second embodiment of the present invention. Detailed Embodiment

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0018] Please refer to the attached Figure 1 - attached Figure 5 , the embodiment of the present invention provides a perforating completion method that can improve the productivity of waterflood well pattern infill adjustment, including the following steps: Step 1: Based on the understanding of the remaining oil distribution law before the waterflood well pattern infill adjustment, collect and sort out the geological data related to the waterflood oilfield; according to the collected geological data, evaluate the properties of each formation; analyze the waterflood effect, that is, how water moves in the underground reservoir and interacts with crude oil. By simulating the waterflood effect, understand which formations are more affected by water and which formations contain more remaining oil; in combination with the core data, use the core well data of this block and similar blocks to analyze the remaining oil distribution and determine the perforating targets; based on the geological data and waterflood effect analysis, evaluate the remaining oil distribution in different formations; in combination with the original well pattern, the oil layers that cannot be controlled by the original well pattern are used as perforating targets, and the thick oil layers with good production in the original well pattern and the medium and low water-flooded parts with unstable internal interlayers in the thick oil layers are not used as perforating targets. Before perforating the oil layer, it is necessary to consider the sedimentary environment of the formation, understand the influence of sedimentary rock types, textures and structures on the distribution of water and oil in the formation, and at the same time, based on the geological analysis results, design the perforating strategy, including the depth, angle and interval of perforation. By perforating the oil layers with low water cut and rich remaining oil, when the water cut of the perforated layer reaches the water cut level of the unperforated oil layer, the unperforated oil layer is perforated. Select appropriate perforating tools, which should be determined according to the wellhead equipment and formation properties; formulate a perforating operation plan to ensure that the perforating operation is safe, controllable, and compliant with the specifications and operation procedures; perform the perforating operation according to the predetermined plan. After the perforating is completed, monitor the production of the well to verify the effect of the perforating operation.

[0019] When perforating the unperforated oil layer, it is necessary to monitor the groundwater level and groundwater flow. When the water cut level of the target layer gradually approaches the level of the unperforated oil layer, it indicates that the waterflood effect gradually invades the unperforated oil layer; evaluate the influence of the waterflood effect on the unperforated oil layer, including the water invasion speed, the contact degree between water and remaining oil, and the influence of water on the properties of the oil layer; when it is determined that the unperforated oil layer needs to be perforated, a detailed perforating plan needs to be formulated and the subsequent perforating operation is carried out; after the perforating operation is completed, closely monitor the production of the well to verify the effect of the perforating operation.

[0020] Step 2: Based on the understanding of the remaining oil distribution pattern before the infill adjustment of the waterflooding well pattern, by perforating the oil layers with low water cut and rich remaining oil, and at the same time taking fracturing measures for low-permeability and low-water-cut oil layers to improve the liquid production capacity. Through geological exploration and logging data, determine which oil layers are low-permeability and low-water-cut and suitable for fracturing operations. Evaluate the porosity, permeability, rock mechanical properties, etc. of the target oil layers to provide basic data for fracturing design. Determine the depth range in the wellbore for fracturing, design the composition of the fracturing fluid according to the results of geological analysis, and determine the range of injection pressure, variation law, total displacement and injection rate of the fracturing fluid. Combine with limited-entry fracturing. For the relatively concentrated thin and poor layers in the vertical direction, use the limited-entry fracturing method to achieve the goal of producing the oil layers. Install downhole fracturing tools, including fracturing pipes and perforating guns, inject the pre-prepared fracturing fluid into the wellbore, push the fracturing fluid to the target oil layer through the fracturing pipe, apply high pressure to make the fracturing fluid enter the oil layer, generate fractures, improve the permeability of the oil layer, and reduce the interlayer contradiction. Before perforating and fracturing design, conduct a comprehensive geological and engineering integrated study to deeply understand the geological characteristics, properties and reservoir property change trends between different oil layers. Through data analysis and numerical simulation, simulate and predict the permeability, pressure, oil-water distribution, etc. of different oil layers. During fracturing and perforating operations, avoid the decline of the productivity of other oil layers due to overdevelopment of a certain oil layer, and achieve the productivity balance of different oil layers. During the operation process, timely monitor the productivity, oil-water ratio and other indicators of different oil layers, and make adjustments according to the monitoring results.

[0021] When the water cut and permeability of the layers to be perforated are similar to those of the unperforated oil layers, perforate the unperforated oil layers to produce the remaining oil in these oil layers. When perforating the unperforated oil layers, it is necessary to ensure the balance of water and aquifers, determine the water cut before and after perforating the unperforated oil layers, and master the change of water content in the perforated and unperforated oil layers through monitoring and analyzing data to ensure that they are similar when perforating. Consider parameters such as the water drive effect and water permeability of the unperforated oil layers, and compare them with the perforated oil layers to ensure that they are similar or equal. Conduct numerical simulation and prediction analysis to speculate on the water drive effect and permeability change after perforating the unperforated oil layers, and coordinate and balance with the perforated oil layers.

[0022] Secondly, it is also necessary to ensure permeability balance, determine the permeability changes before and after perforating the unperforated oil layers, analyze the permeability differences between the perforated oil layers and the unperforated oil layers through geological data, downhole logging and other information; consider the water flooding effect, formation rock properties and oil layer porosity factors, adjust the perforation design when perforating the unperforated oil layers to make it match or approach the permeability of the perforated oil layers; conduct simulation and prediction analysis to evaluate the permeability changes after perforating the unperforated oil layers, avoid excessive permeability differences, and maintain the balanced production capacity of the overall water flooding well pattern. And when taking fracturing measures, reasonably select and use materials such as fracturing fluids and fracturing additives to reduce the impact on the environment, and follow safety standards and environmental protection measures to ensure the safety and environmental protection of the operation. Example Two

[0023] The embodiment of the present invention provides a perforating completion method that can improve the production capacity of the infill adjustment of the water flooding well pattern. This method is used to optimize the perforation targets in the infill adjustment blocks in the middle and west areas of the third and fourth belts in the northern transition zone of the Saabei Development Area. Aiming at the problems of high crude oil viscosity, poor injection-production situation, and low recovery degree in the third and fourth belts of the northern transition zone of the Saabei Development Area, infill adjustment was started in 2019. The original four-point and linear well patterns with a distance of 300 - 350m were adjusted to a five-point area well pattern with a distance of 150 - 175m through new drilling, injection conversion, etc., and the injection-production situation was improved. During the gradual adjustment process, with the continuous deepening of the understanding of remaining oil, a transformation from perforating all the encountered oil layers to selective perforation was realized in the perforation targets. In 2022, selective perforation was implemented in the infill adjustment blocks in the middle and west areas of the third and fourth belts in the northern transition zone. The initial daily oil production per well was 2.6t, reaching twice the level of the design plan, achieving good development results, and providing good guidance for the adjustment and potential tapping of the third and fourth belts in the transition zone.

[0024] For the perforation targets in the infill adjustment blocks of the water flooding well pattern, selective perforation is adopted. The optimization of the perforation targets combines three aspects. One is to combine with core data. Refer to the appendix Figure 1 , and use the core well data of this block and similar blocks to analyze the remaining oil distribution and determine the perforation targets. Combining with the core well data, avoid perforating high water cut aquifers and displaced oil layers, and perforate the remaining oil enriched parts at the top of thick oil layers and the remaining oil not exploited. The second is to combine with the original well pattern. Refer to the appendix Figure 2 and appendix Figure 3 , the oil layers not controlled by the original well pattern are used as perforation targets, and the thick oil layers with good production in the original well pattern and the medium and low water flooded parts with unstable internal interlayers in thick oil layers are not used as perforation targets. Combining with the old well pattern, perforate the thin and poor layers of the Sa I group and the isolated sand bodies where the injection-production of the original well patterns of the Sa II and Sa III are not perfect. Combining with the displacement situation of the old well pattern, avoid perforating the medium and low water flooded parts with unstable internal interlayers in thick oil layers. The third is to combine with limited entry fracturing. Refer to the appendix Figure 4, for the target of stimulating the oil reservoir by using the limited-entry fracturing method for the relatively concentrated thin and poor layers in the vertical direction. Select the thin and poor layers in combination with the limited-entry fracturing method.

[0025] After optimizing the perforation targets according to the above method, the average daily oil production per well in the initial production stage is 2.6 tons, which is twice that of the design of the plan and 1.2 tons higher than that of the block that does not use this method to select the perforation targets; the comprehensive water cut is 89.5%, which is 6 percentage points lower than the design of the plan and 6.7 percentage points lower than that of the block that does not use this method to select the perforation targets.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A perforating completion method capable of improving the productivity of infill adjustment of water flooding well patterns, characterized in that, The following steps are involved: Step 1: Based on the understanding of the distribution law of remaining oil before the intensification and adjustment of the water drive well pattern, after the new well is drilled, further analyze each new well, each oil layer and the degree of water flooding in the layer. At the same time, combined with the position of the single well in the original well pattern and the water absorption and utilization data of the old well, the oil layer with low water content and rich remaining oil is opened by perforating, and the wells with relatively concentrated thin and poor layers in the vertical direction are subjected to flow limiting fracturing to reduce interlayer contradictions and improve the productivity of single wells. Step 2: Based on the understanding of the distribution law of the remaining oil before the water drive well pattern is adjusted, after the first perforation, when the water content and permeability of the perforated layer are equivalent to those of the unperforated oil layer, the unperforated oil layer is re-perforated to mobilize the remaining oil in this part of the oil layer.

2. A perforating completion method for improving the productivity of infill adjustment of water flooding well patterns according to claim 1, characterized in that, The understanding of the residual oil distribution law in step 1 includes: Collect and organize geological data related to water-flooded oil fields; Analyze the remaining oil distribution patterns of each oil layer based on the collected geological data; Analyze the water flooding effect, that is, how water moves in underground reservoirs and interacts with crude oil. By simulating the water flooding effect, we can identify which oil layers are highly flooded and which oil layers are rich in residual oil. Combined with the coring data, using the coring data of this block and similar blocks, analyze the distribution of remaining oil and determine the perforation targets; Evaluate the distribution of remaining oil in different oil layers based on geological data and water flooding effect analysis; Combined with the original well network, the oil layers that cannot be controlled by the original well network are taken as perforation targets, while the thick oil layers with good exploitation in the original well network and the medium and low water-flooded areas with unstable internal interlayers in the thick oil layers are not taken as perforation targets.

3. A perforating completion method for improving the productivity of waterflood well pattern infill adjustment according to claim 1, characterized in that In step 1, before perforating the oil layer, it is necessary to consider the development status of the oil layer, the connectivity status of the oil layer, the development status of the interlayer, the distribution status of the faults, and the production status of the oil layer. Based on the geological analysis results, the completion method and perforation strategy are designed, including the perforation layer, depth, angle and interlayer.

4. A perforating completion method for improving the productivity of water flooding well pattern infill adjustment according to claim 1, characterized in that The step 1 comprises the following steps of perforating the oil layer with low water content and rich residual oil: The selection of appropriate perforating tools should be determined based on the wellhead equipment and formation properties; Develop perforating operation plans to ensure that perforating operations are safe and controllable and comply with specifications and operating procedures; The perforation operation is carried out according to the predetermined plan. After the perforation is completed, the output of the well is monitored to verify the effectiveness of the perforation operation.

5. A perforating completion method for improving the productivity of water flooding well pattern infill adjustment according to claim 1, characterized in that, The second step of supplementing the unperforated oil layer comprises the following steps: According to the relationship between the water content after the new well is put into production and the water saturation of the perforated oil layer, the water content level of these oil layers after perforation is calculated from the water saturation of the unperforated oil layer. At the same time, the relationship between the dynamic permeability and the permeability of the perforated oil layer in the pressure measurement interpretation results is used. When the water content level of the produced oil layer is close to that of the unperforated oil layer, and the permeability of the unperforated oil layer is close to the dynamic permeability, it is determined to re-drill the unperforated layer. Evaluate the impact of water flooding on unperforated oil layers, including water invasion rate, contact between water and remaining oil, and the impact of water on oil layer properties; When it is determined that the unperforated oil layer needs to be re-opened, a detailed re-opening plan needs to be formulated and the re-opening operation needs to be carried out later; After the re-opening operation is completed, the output of the well is closely monitored to verify the effectiveness of the re-opening operation.

6. A perforating completion method for improving the productivity of water flooding well pattern infill adjustment according to claim 1, characterized in that, Taking the fracturing measures in step 1 includes the following steps: Based on the logging interpretation result data, combined with dynamic data and the location in the old well pattern, determine which oil layers are suitable for limited-entry fracturing completion. For wells where thin and poor layers are relatively concentrated vertically, fracturing is carried out. At the same time, segment according to the oil layer thickness and the thickness of the interlayer to provide basic data for fracturing design; According to the acoustic variable density logging, determine whether the cementing quality meets the fracturing requirements. For the fracturing isolation layer, the cementing coefficient is required to reach above 0.8; Prepare an operation instruction manual for limited-entry fracturing according to the designed fracturing layer, arrange the hole depth of the fracturing layer, and prepare a formal geological plan for limited-entry fracturing; Design the composition of the fracturing fluid according to the results of the analysis of the limited-entry fracturing geological plan, and determine the range of injection pressure, variation law, total displacement of the fracturing fluid and injection speed; Install downhole fracturing tools, including fracturing pipes and perforating guns. Inject the pre-prepared fracturing fluid into the wellbore, push the fracturing fluid to the target oil layer through the fracturing pipe, apply high pressure to make the fracturing fluid enter the oil layer, generate fractures, and improve the permeability of the oil layer.

7. A perforating completion method for improving the productivity of water flooding well pattern infill adjustment according to claim 1, characterized in that The steps to reduce the interlayer contradiction in Step 1 include the following steps: Before perforating and fracturing design, based on the dynamic production data of the original well pattern and the logging interpretation water-flooded layer data after the completion of the new well, conduct a comprehensive and integrated analysis and research, summarize the development law, determine the remaining oil potential oil layers and the difficulty of driving the potential oil layers, and then determine which part of the oil layer to perforate to reduce the interlayer contradiction; Through data analysis and numerical simulation, simulate and predict the permeability, pressure, oil-water distribution, etc. of different oil layers; According to the data interpreted from the coring well data, combined with the location of the coring well in the original well pattern, analyze the difficulty of driving different oil layers, and make a good choice of the perforated oil layer to reduce the interlayer interference and achieve the purpose of efficient development.

8. A perforating completion method for improving the productivity of waterflood well pattern infill adjustment according to claim 1, characterized in that, When re-perforating the unperforated oil layer in Step 2, it is necessary to ensure the balance of water content between the perforated layer and the developed oil layer, specifically including: Determine the water content before and after re-perforating the unperforated oil layer. By monitoring and analyzing data, master the water content changes of the perforated oil layer and the unperforated oil layer to ensure that they are equivalent during re-perforation; Consider parameters such as the water drive effect and water permeability of the unperforated oil layer, and compare with the perforated oil layer to ensure that they are similar or equal; Conduct numerical simulation and prediction analysis to speculate on the water drive effect and permeability changes after re-perforating the unperforated oil layer, and coordinate and balance with the perforated oil layer.

9. A perforating completion method for improving the productivity of waterflood well pattern infill adjustment according to claim 1, characterized in that, When re-perforating the unperforated oil layer in Step 2, it is also necessary to ensure permeability balance, specifically including: Determine the permeability changes before and after re-perforating the unperforated oil layer. Analyze the permeability differences between the perforated oil layer and the unperforated oil layer through geological data, downhole logging, etc.; Consider factors such as water drive effect, formation rock properties and oil layer porosity, and adjust the perforating design when re-perforating the unperforated oil layer to make it match or be close to the permeability of the perforated oil layer; Conduct simulation and prediction analysis to evaluate the permeability changes after re-perforating the unperforated oil layer, and avoid excessive permeability differences to maintain the balanced production capacity of the overall water drive well pattern.

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