A method for plugging a multi-cluster fracturing irregular hole and application thereof
By determining the size and quantity of the knot plugging agent through image acquisition and simulation testing, the problem of sealing irregularly shaped holes was solved, the fracturing effect was improved, and the efficient development of the reservoir was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2022-09-05
- Publication Date
- 2026-07-03
Smart Images
Figure CN117684939B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil and gas development technology, and in particular to a method for sealing multi-cluster fracturing irregular orifices and its application. Background Technology
[0002] In recent years, temporary plugging fracturing has become a key technology for unconventional oil and gas development. By pumping in biodegradable plugging agents, dominant fluid inflow channels are blocked, forcing the fluid flow to divert into less favorable channels, thus expanding the reservoir stimulation volume. After fracturing, the plugging agent degrades and is flushed back to the surface with the fluid, causing no damage to the reservoir. Depending on the operational objective, the plugging agent can seal fracture ends, fracture openings, and perforation holes. Due to the large fracture size, high plugging agent usage and low success rate during plugging, perforation sealing has gradually become the dominant method. However, during fracturing operations, high flow rates and large sand volumes lead to severe perforation erosion and increased hole diameter. Because it is difficult to achieve absolute centering of the perforating gun, there are differences in the initial shape and size of high-side holes and low-side holes (in horizontal wells placed horizontally underground, holes opening upwards are high-side holes, and holes opening downwards are low-side holes). Significant heterogeneity exists among multiple perforation clusters within the fracturing section of a horizontal well, resulting in significant differences in fluid velocity and flow direction among various holes, easily leading to irregularly shaped holes. Conventional particulate or spherical temporary plugging agents are difficult to use for effective sealing, and are prone to forming super-cracks during fracturing, which seriously affects the overall effect of multi-cluster fracturing in the segment. Summary of the Invention
[0003] The inventors have discovered that there is currently no effective method for sealing irregularly shaped perforations. These perforations have complex morphologies, and conventional spherical plugging agents have limited deformation, making them unable to completely seal the perforations. Furthermore, conventional particulate plugging agents have small particle sizes, making it difficult to effectively bridge larger perforations after erosion. Moreover, sealing multiple clusters of irregularly shaped perforations within a fracturing section is crucial for the efficient development of unconventional oil and gas reservoirs. In view of the above problems, this invention is proposed to provide a method for sealing multiple clusters of irregularly shaped fracturing perforations that overcomes or at least partially solves these problems, and its application.
[0004] In a first aspect, embodiments of the present invention provide a method for sealing multi-cluster fracturing irregular orifices, the method comprising:
[0005] For the target fracturing section of the target well, a preset volume of proppant is pumped in, based on the fracturing flow rate and sand ratio parameters of the horizontal wells in the block where the target well is located.
[0006] After pumping in the proppant, pump in the displacement fluid and run in coiled tubing to flush the wellbore until the returned fluid is free of impurities.
[0007] The image acquisition device is lowered into the target fracturing section using coiled tubing to acquire image data of the target fracturing section based on the image acquisition device;
[0008] Based on the image data, the irregular holes in the target fracturing section are identified, and a metal model of the irregular holes is prepared based on the size of the irregular holes.
[0009] The irregularly shaped perforated metal model was placed in a high-pressure displacement device to simulate the formation environment and fracturing fluid was pumped in before a plugging test was conducted to determine the ball size of the rope-knot plugging agent used for plugging.
[0010] Through multiple simulation experiments, the matching relationship between the irregular hole metal model and the amount of knot plugging agent used was statistically analyzed to determine the amount of knot plugging agent used for sealing the target fracturing section.
[0011] The irregular orifices in the target fracturing section are sealed based on the determined ball size of the knot plug and the quantity of the knot plug.
[0012] Optionally, the method may further include: comparing the construction data before and after temporary plugging based on the curve overlap method to verify the plugging effect of the irregular orifice.
[0013] Optionally, comparing the construction data before and after temporary plugging based on the curve overlap method to verify the sealing effect of the irregularly shaped orifice may include:
[0014] Fracturing fluid and proppant were pumped in at the same displacement and sand concentration, and the pressure changes before and after temporary plugging were determined based on the curve overlap method.
[0015] If the pressure after temporary plugging is greater than the pressure before temporary plugging, then the irregular orifice is successfully plugged.
[0016] Otherwise, add the same ball knot size and the same amount of knot sealant, and re-verify the sealing effect of the irregular hole based on the curve overlap method.
[0017] Optionally, the step of identifying the irregularly shaped holes in the target fracturing section based on the image data, and preparing a metal model of the irregularly shaped holes based on their dimensions, may include:
[0018] Based on the image data, the irregular holes in the target fracturing section were identified;
[0019] Based on the irregularly shaped hole and the preset positioning mark, the size of the irregularly shaped hole after erosion is determined;
[0020] Based on the dimensions of the irregularly shaped hole, the sleeve is cut to prepare a metal model of the irregularly shaped hole.
[0021] Optionally, the step of using coiled tubing to lower an image acquisition device into the target fracturing section to acquire image data of the target fracturing section based on the image acquisition device may include:
[0022] The image acquisition device is lowered into the horizontal well casing using coiled tubing, and the target fracturing section is determined based on the preset positioning markers in the horizontal well casing.
[0023] Continue lowering the image acquisition device to the bridge plug of the target fracturing section;
[0024] The image acquisition device is pulled back at a preset speed to acquire image data of the entire target fracturing section.
[0025] Optionally, placing the irregularly shaped perforated metal model in a high-pressure displacement device, simulating the formation environment, and pumping fracturing fluid before conducting a plugging test to determine the ball knot size of the plugging agent may include:
[0026] The irregularly shaped perforated metal model is placed in a high-pressure displacement device, and the same fracturing fluid as that in the formation environment is continuously injected by the high-pressure displacement device, so that the internal and external pressures of the irregularly shaped perforated metal model under formation conditions are simulated on both sides.
[0027] Rope knot sealants of different ball knot sizes were placed in the irregularly shaped hole metal model for sealing tests;
[0028] When the sealing pressure reaches the preset pressure value, determine the ball knot size of the sealing agent used for sealing.
[0029] Optionally, before sealing the irregular orifices in the target fracturing section based on the determined ball knot size and quantity of the knot plug, the procedure may further include:
[0030] The discharge rate of a single irregularly shaped orifice was determined based on an indoor visualization experiment of temporary plugging agent migration;
[0031] Based on the discharge rate of the individual irregular orifice and the number of orifices in the target fracturing section, the total discharge rate for plugging is determined, and the irregular orifices in the target fracturing section are plugged based on the total discharge rate for plugging.
[0032] Optionally, the step of pumping a preset volume of proppant based on the fracturing displacement and sand ratio parameters of the horizontal wells in the block where the target well is located may include:
[0033] The displacement and sand ratio in the construction parameters of fractured wells in the block where the target well is located are statistically analyzed to determine the fracturing displacement and sand ratio parameters.
[0034] Based on the principle that the proppant addition and temporary plugging timing for a single fracturing section of the target well in the block are half of the designed proppant volume, and based on the fracturing discharge rate and sand ratio parameters, half the total designed proppant volume is pumped into the target fracturing section.
[0035] Optionally, the method may further include: based on the original logging data and logging interpretation data included in the well logging integrated interpretation result map, selecting the fracturing section with the largest perforation cluster stress difference in the target well as the target fracturing section.
[0036] Secondly, embodiments of the present invention provide an application of the multi-cluster fracturing irregular hole plugging method described in the first aspect in horizontal well fracturing technology.
[0037] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:
[0038] This invention provides a method for plugging multi-cluster fracturing irregular holes and its application. The method may include: for the target fracturing section of the target well, using the fracturing displacement and sand ratio parameters of horizontal wells in the block where the target well is located as a benchmark, pumping a preset volume of proppant; after pumping the proppant, pumping displacement fluid and running coiled tubing to clean the wellbore until the returned fluid is free of impurities; using coiled tubing to run an image acquisition device into the target fracturing section to acquire image data of the target fracturing section based on the image acquisition device; and identifying the target fracturing based on the image data. The irregularly shaped holes in the target fracturing section were identified, and a metal model of the irregularly shaped holes was prepared based on their dimensions. The metal model was placed in a high-pressure displacement device to simulate the formation environment, and fracturing fluid was pumped in before a plugging test was conducted to determine the ball knot size of the plugging agent. Through multiple simulation tests, the matching relationship between the metal model of the irregularly shaped holes and the amount of plugging agent used was statistically analyzed to determine the amount of plugging agent used for plugging the target fracturing section. Based on the determined ball knot size and amount of plugging agent, the irregularly shaped holes in the target fracturing section were plugged.
[0039] This method involves cleaning the wellbore, using image acquisition equipment to obtain the actual morphology of the target fracturing section, and then processing a metal model of the same morphology of the irregularly shaped pores before conducting an indoor irregularly shaped pore plugging test. This allows for the determination of the ball knot size and quantity of the rope knot plugging agent to plug the irregularly shaped pores in the target fracturing section, thereby improving the efficiency of irregularly shaped pore plugging and the overall transformation effect of multi-cluster fracturing within the section.
[0040] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.
[0041] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0042] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0043] Figure 1 This is a flowchart illustrating the method for sealing multi-cluster fracturing irregular orifices provided in an embodiment of the present invention;
[0044] Figure 2 This is a schematic diagram of the morphology of the eroded holes provided in an embodiment of the present invention;
[0045] Figure 3 This is an example of a physical image of an irregularly shaped hole seal provided in an embodiment of the present invention;
[0046] Figure 4 This is an example of a physical image of the knot sealant provided in an embodiment of the present invention;
[0047] Figure 5 This is a schematic diagram illustrating the curve overlap method for determining the temporary blocking effect in an embodiment of the present invention. Detailed Implementation
[0048] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0049] This invention provides a method for sealing irregularly shaped holes formed by erosion on the casing during fracturing. This method can effectively seal irregularly shaped holes formed by erosion during fracturing, improving the sealing efficiency of irregularly shaped holes and the overall modification effect of multi-cluster fracturing within the section. (Refer to...) Figure 1 As shown, the method may include the following steps:
[0050] Step S11: For the target fractured section of the target well, based on the fracturing flow rate and sand ratio parameters of the horizontal wells in the block where the target well is located, pump in a preset volume of proppant.
[0051] In this embodiment of the invention, steps S11 and S12 are for cleaning the wellbore to remove sand, burrs and other foreign objects from the wellbore wall, so as to prevent blockage of the wellbore when the casing or image acquisition equipment is lowered.
[0052] In the specific implementation of this step, firstly, the displacement and sand ratio in the construction parameters of the fractured wells in the block where the target well is located are statistically analyzed to determine the fracturing displacement and sand ratio parameters of the target well; then, based on the principle that the design proppant addition and temporary plugging timing for a single fractured section of a horizontal well in the target well block is half, proppant of half the total design proppant volume is pumped into the target fractured section based on the fracturing displacement and sand ratio parameters.
[0053] For example, among the 10 fractured wells in the block where the target well (Well A) is located, the displacement during the proppant injection stage is 12 cubic meters per minute, and the main proppant ratio is 10-20%. These parameters are used as the displacement and proppant ratio parameters for the target fractured section of Well A. Based on the design proppant volume of 120 cubic meters for the target fractured section of Well A, half of this volume, 60 cubic meters, is pumped. In this embodiment of the invention, based on field experience, the inventors pump half the volume of proppant during injection. The purpose is to ensure that the fractures that preferentially absorb proppant are fully propped up with sand. Then, a temporary plugging agent is pumped to seal these sand-injecting fractures, ensuring that half of the proppant is used in the fractures that initially did not absorb sand, thus achieving a better sealing effect.
[0054] Step S12: After pumping in the proppant, pump in the displacement fluid and run in the coiled tubing to clean the wellbore until the returned fluid is free of impurities.
[0055] This step, after pumping in the proppant, requires cleaning the wellbore. Before cleaning, a displacement fluid is injected to push the proppant into the fractures (in this embodiment, the displacement fluid can be clean water or low-viscosity fracturing fluid). In practice, parameters such as the friction-line wellbore volume, wellbore inner diameter, and coiled tubing outer diameter can be obtained from the target well's design data. A preset value (e.g., 0.5–1.0 m) is added to the friction-line wellbore volume. 3 This is used to determine the amount of displacement fluid to be pumped. In this example, the friction wellbore volume is 52 m³. 3 The pumped displacement fluid can be 53m³. 3 After pumping in the displacement fluid, run in the coiled tubing and continuously flush the wellbore at a flow rate of 2-3 cubic meters per second until the fluid returning from the wellhead is free of impurities.
[0056] Step S13: Use coiled tubing to lower the image acquisition device into the target fracturing section to acquire image data of the target fracturing section based on the image acquisition device.
[0057] The image acquisition device used in this step is a 360-degree panoramic high-definition camera. This image acquisition device has four cameras installed within a 360-degree range, ensuring that all the holes on the 360-degree circumferential surface of the sleeve can be captured in a single shot during implementation.
[0058] Specifically, this step may include: First, using coiled tubing to lower the image acquisition device into the horizontal well casing, and determining the target fracturing section based on the preset positioning markers in the horizontal well casing; second, continuing to lower the image acquisition device to the bridge plug of the target fracturing section; and finally, pulling back the image acquisition device at a preset speed to acquire image data of the entire target fracturing section.
[0059] In a specific example, the image acquisition device is lowered to the bridge plug of the target fracturing section and pulled back at a speed of 5 to 10 m / min to achieve full-process image acquisition of the entire target fracturing section.
[0060] Step S14: Based on image data, identify the irregular holes in the target fracturing section, and prepare a metal model of the irregular holes based on their size.
[0061] This step involves simulating the actual eroded casing holes during on-site construction in a laboratory. This allows for simulated plugging tests in the laboratory, saving significant resources compared to on-site testing. It also avoids the risk of improper use of temporary plugging agents leading to failure to seal the holes or large-area blockage of the well casing.
[0062] In this step, the irregular holes in the target fracturing section are first identified based on image data; then, the size of the irregular holes after erosion is determined based on the irregular holes and preset positioning marks; finally, the casing is cut based on the size of the irregular holes to prepare a metal model of the irregular holes.
[0063] In a specific example, refer to Figure 2 As shown, irregularly shaped holes in the target fracturing section are identified based on image data, with the area enclosed by the white solid line representing the morphology of the irregularly shaped holes after erosion. In this embodiment of the invention, holes with larger erosion are preferred as irregularly shaped holes, and a metal model of the irregularly shaped hole is machined by cutting, mimicking its shape and size.
[0064] Step S15: Place the irregularly shaped perforated metal model in the high-pressure displacement device, simulate the formation environment, pump fracturing fluid, and then conduct a plugging test to determine the ball knot size of the plugging agent.
[0065] This step involves a laboratory simulation of the formation and fracturing environment during actual construction to conduct a plugging test. The final determination of the ball-knot size of the plugging agent is based on achieving the predetermined plugging effect. It should be noted that the high-pressure displacement device described in this embodiment can continuously pump fracturing fluid and can withstand the differential pressure inside and outside the wellbore under formation conditions, thereby evaluating whether the temporary plugging agent can effectively seal the wellbore.
[0066] In practice, the irregular hole metal model is first placed in a high-pressure displacement device, and the same fracturing fluid as the formation environment is continuously injected by the high-pressure displacement device to simulate the internal and external pressures of the irregular hole under formation conditions on both sides of the irregular hole metal model. Then, rope knot plugging agents of different ball knot sizes are placed in the irregular hole metal model for plugging test. Finally, when the plugging pressure reaches the preset pressure value, the ball knot size of the rope knot plugging agent used for plugging is determined.
[0067] In a specific example, refer to Figure 3 The actual object showing the sealing of the irregularly shaped hole, and Figure 4 The actual rope plugging agent shown is used in a high-pressure displacement device with a metal model of the irregularly shaped well. Rope plugging agents of different ball knot sizes are placed in the irregularly shaped well, and fracturing fluid is pumped in to conduct a well plugging test. When the plugging pressure reaches 10 MPa (10 MPa is an empirical value for the block where the target well is located, and this value can be adjusted according to the actual situation, for example, 5 to 10 MPa), it indicates that the ball knot size of the selected rope plugging agent is appropriate.
[0068] Step S16: Through multiple simulation experiments, statistically analyze the matching relationship between the irregular hole metal model and the amount of knot plugging agent used to determine the amount of knot plugging agent used for sealing the target fracturing section.
[0069] In this step, after determining the size of the knot plugging agent's ball, it's necessary to determine the total number of perforations in the target fracturing section based on the perforation plan in the fracturing design. For example, this involves statistically analyzing the relationship between the amount of knot plugging agent added to the target fracturing section and the number of perforations over 100 tests, using a temporary plugging agent pressurization of 10 MPa as a standard. Through multiple tests, it can be determined that the number of knot plugging agents should be 1.1 to 1.2 times the number of perforations. For instance, in this example, the target fracturing section has 6 perforation clusters, each with 6 perforations, for a total of 36 perforations. Based on the principle of determining the number of knot plugging agents based on 1.1 to 1.2 times the number of perforations, the target well requires 40 to 44 knot plugging agents to be added to the target fracturing section.
[0070] Step S17: Based on the determined ball size and quantity of the knot plug, seal the irregular holes in the target fracturing section.
[0071] The irregular pores in the target fracturing section are sealed by using the ball knot size of the knot plug determined in step S15 and the quantity of knot plug determined in step S16.
[0072] The above-mentioned method for sealing irregularly shaped holes in multi-cluster fracturing provided in this embodiment of the invention involves cleaning the wellbore, using image acquisition equipment to obtain the actual morphology of the target fracturing section, processing a metal model of the irregularly shaped hole with the same morphology, and then conducting an indoor irregularly shaped hole sealing test to determine the ball knot size and quantity of the rope knot plugging agent in order to seal the irregularly shaped holes in the target fracturing section. This improves the sealing efficiency of irregularly shaped holes and the overall transformation effect of multi-cluster fracturing within the section.
[0073] In an optional embodiment, refer to Figure 1 As shown, the method may further include: step S18, comparing the construction data before and after temporary plugging based on the curve overlap method to verify the plugging effect of the irregular hole.
[0074] The curve overlap method used in this step refers to comparing construction data before and after temporary plugging, namely, displacement, sand concentration, and pumping pressure. In practice, this step may include: pumping fracturing fluid and proppant at the same displacement and sand concentration, and judging the pressure change before and after temporary plugging based on the curve overlap method; if the pressure after temporary plugging is greater than the pressure before temporary plugging, the irregular hole is successfully plugged; otherwise, add the same ball-knot size and the same amount of rope knot plugging agent, and re-verify the plugging effect of the irregular hole based on the curve overlap method.
[0075] In a specific example, refer to Figure 5 As shown, the pressure after temporary plugging is significantly higher than the pressure before temporary plugging, indicating that the temporary plugging is effective and there is no need to add more knot plugging agent.
[0076] In another optional embodiment, before performing step S17, i.e. before sealing the irregular orifices of the target fracturing section based on the determined ball knot size and quantity of the knot plug, it is also necessary to determine the total displacement for sealing, as follows:
[0077] First, the discharge rate of a single irregularly shaped orifice is determined based on an indoor visualization experiment of temporary plugging agent migration. Then, based on the discharge rate of a single irregularly shaped orifice and the number of orifices in the target fracturing section, the total discharge rate for plugging is determined, and the irregularly shaped orifices in the target fracturing section are plugged based on the total discharge rate for plugging.
[0078] In this embodiment of the invention, the total discharge rate for plugging is equal to the discharge rate per hole multiplied by the number of holes. In a specific example, through an indoor visualization experiment of the temporary plugging agent's migration, it was determined that when the discharge rate per hole is 0.1–0.2 cubic meters per minute, the temporary plugging agent can effectively enter the hole, resulting in high plugging efficiency. In this example, the target fracturing section is designed with 36 holes, so the total discharge rate for plugging is 3.6–7.2 cubic meters per minute.
[0079] Of course, in this embodiment of the invention, the viscosity of the carrier fluid is controlled at 40-100 mPa·s by controlling the concentration of the non-mixed slippery water emulsion. The viscosity of the carrier fluid can be obtained by referring to the concentration of the fracturing fluid (carrying fluid) during specific construction and by using construction parameters.
[0080] In another alternative embodiment, reference is also made to Figure 1 As shown, the method may further include:
[0081] Step S10: Based on the original logging data and logging interpretation results included in the well logging integrated interpretation results map, the fracturing section with the largest perforation cluster stress difference in the target well is taken as the target fracturing section.
[0082] In this step, based on the comprehensive interpretation results of well logging, including raw well logging data (such as sonic logging, density, gamma ray values, etc.) and well logging interpretation data (such as Young's modulus, Poisson's ratio, in-situ stress, etc.), the location of perforation clusters is determined according to gas logging values and brittleness index. In one example, the target well has 10 fracturing sections. The stresses of the six perforation clusters in the third fracturing section are 61 MPa, 65 MPa, 68 MPa, 62 MPa, 67 MPa, and 62 MPa, respectively. These clusters exhibit the greatest stress difference and can be preferentially selected as the target fracturing section.
[0083] Based on the same inventive concept, this embodiment of the invention also provides an application of the above-mentioned multi-cluster fracturing irregular hole plugging method in horizontal well fracturing process.
[0084] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A method for sealing multi-cluster fracture irregular-shaped orifices, characterized in that, include: For the target fracturing section of the target well, a preset volume of proppant is pumped in, based on the fracturing flow rate and sand ratio parameters of the horizontal wells in the block where the target well is located. After pumping in the proppant, pump in the displacement fluid and run in coiled tubing to flush the wellbore until the returned fluid is free of impurities. The image acquisition device is lowered into the target fracturing section using coiled tubing to acquire image data of the target fracturing section based on the image acquisition device; Based on the image data, the irregular holes in the target fracturing section are identified, and a metal model of the irregular holes is prepared based on the size of the irregular holes. The irregularly shaped perforated metal model was placed in a high-pressure displacement device to simulate the formation environment and fracturing fluid was pumped in before a plugging test was conducted to determine the ball size of the rope-knot plugging agent used for plugging. Through multiple simulation experiments, the matching relationship between the irregular hole metal model and the amount of knot plugging agent used was statistically analyzed to determine the amount of knot plugging agent used for sealing the target fracturing section. The irregular orifices in the target fracturing section are sealed based on the determined ball size of the knot plug and the quantity of the knot plug.
2. The method of claim 1, wherein, Also includes: The construction data before and after temporary plugging were compared using the curve overlap method to verify the plugging effect of the irregular-shaped orifice.
3. The method of claim 2, wherein, The comparison of construction data before and after temporary plugging based on the curve overlap method to verify the sealing effect of the irregular-shaped orifice includes: Fracturing fluid and proppant were pumped in at the same displacement and sand concentration, and the pressure changes before and after temporary plugging were determined based on the curve overlap method. If the pressure after temporary plugging is greater than the pressure before temporary plugging, then the irregular orifice is successfully plugged. Otherwise, add the same ball knot size and the same amount of knot sealant, and re-verify the sealing effect of the irregular hole based on the curve overlap method.
4. The method of claim 1, wherein, The process of identifying irregularly shaped holes in the target fracturing section based on the image data, and preparing a metal model of the irregularly shaped holes based on their dimensions, includes: Based on the image data, the irregular holes in the target fracturing section were identified; Based on the irregularly shaped hole and the preset positioning mark, the size of the irregularly shaped hole after erosion is determined; Based on the dimensions of the irregularly shaped hole, the sleeve is cut to prepare a metal model of the irregularly shaped hole.
5. The method of claim 1, wherein, The step of using coiled tubing to lower an image acquisition device into the target fracturing section to acquire image data of the target fracturing section based on the image acquisition device includes: The image acquisition device is lowered into the horizontal well casing using coiled tubing, and the target fracturing section is determined based on the preset positioning markers in the horizontal well casing. Continue lowering the image acquisition device to the bridge plug of the target fracturing section; The image acquisition device is pulled back at a preset speed to acquire image data of the entire target fracturing section.
6. The method of claim 1, wherein, The step of placing the irregularly shaped perforated metal model in a high-pressure displacement device, simulating the formation environment, pumping fracturing fluid, and then conducting a plugging test to determine the ball knot size of the plugging agent includes: The irregularly shaped perforated metal model is placed in a high-pressure displacement device, and the same fracturing fluid as that in the formation environment is continuously injected by the high-pressure displacement device, so that the internal and external pressures of the irregularly shaped perforated metal model under formation conditions are simulated on both sides. Rope knot sealants of different ball knot sizes were placed in the irregularly shaped hole metal model for sealing tests; When the sealing pressure reaches the preset pressure value, determine the ball knot size of the sealing agent used for sealing.
7. The method of claim 1, wherein, Before sealing the irregular orifices in the target fracturing section based on the determined ball knot size and quantity of the knot plug, the procedure further includes: The discharge rate of a single irregularly shaped orifice was determined based on an indoor visualization experiment of temporary plugging agent migration; Based on the discharge rate of the individual irregular orifice and the number of orifices in the target fracturing section, the total discharge rate for plugging is determined, and the irregular orifices in the target fracturing section are plugged based on the total discharge rate for plugging.
8. The method according to any one of claims 1 to 7, characterized in that, The step of pumping a preset volume of proppant, based on the fracturing displacement and sand ratio parameters of horizontal wells in the block where the target well is located, includes: The displacement and sand ratio in the construction parameters of fractured wells in the block where the target well is located are statistically analyzed to determine the fracturing displacement and sand ratio parameters. Based on the principle that the proppant addition and temporary plugging timing for a single fracturing section of the target well in the block are half of the designed proppant volume, and based on the fracturing discharge rate and sand ratio parameters, half the total designed proppant volume is pumped into the target fracturing section.
9. The method according to any one of claims 1 to 7, characterized in that, Also includes: Based on the original logging data and logging interpretation results included in the well logging integrated interpretation results map, the fracturing section with the largest perforation cluster stress difference in the target well is taken as the target fracturing section.
10. The application of the multi-cluster fracturing irregular hole plugging method as described in any one of claims 1 to 9 in horizontal well fracturing process.