Well drilling leakage-proof plugging material and duplex pressure-bearing plugging method thereof

Abstract

The invention relates to a well drilling leakage-proof plugging material and a duplex method pressure-bearing plugging method thereof, and belongs to the technical field of well drilling leakage-proof plugging, and the method comprises the following steps: S1, first pressure-bearing plugging and drilling tool adjustment: 1) before pulling out of a hole, injecting super glue into a leakage layer to carry out pressure-bearing plugging pretreatment, and verifying the preliminary plugging effect of the leakage layer; (2) after pulling out of the hole, a polished drill pipe is tripped to the position 3-5 m above the leakage layer, it is ensured that the bottom end of the drill pipe is located above the top of the leakage layer, and leakage stopping slurry is prevented from being dispersed too early; s2, preparation of the plugging slurry: 1) injecting a base solution into a slurry preparation tank; by the adoption of the duplex pressure-bearing plugging method, original empirical description is converted into a reproducible and quantifiable standardized operation program through four dimensions of technical logic clearness, operation process standardization, management efficiency improvement and field applicability optimization, the core technical advantages of an original scheme are reserved, and the application range of the duplex pressure-bearing plugging method is widened. Fuzzy points and risk points in implementation are solved through structural transformation, and the success rate and safety of leaking stoppage operation are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of drilling leakage prevention and plugging technology, specifically relating to a drilling leakage prevention and plugging material and its two-stage pressure-bearing plugging method. Background Technology

[0002] Drilling leakage prevention and plugging is a key technical aspect of drilling engineering to ensure wellbore integrity, prevent drilling fluid loss, and guarantee operational safety, especially in complex formations (such as fractured, fractured zones, and high-pressure water layers).

[0003] Currently, traditional plugging methods lack pre-assessment of the leak layer condition. Direct injection of plugging grout may lead to material waste or sealing failure. The addition sequence of multi-component plugging grout lacks theoretical support, which can easily lead to uneven material dispersion or reaction failure. The lack of unified time node control in the processes of grout preparation, pumping, and grout replacement can easily lead to delays in process connection. Traditional plugging grout operation methods are not standardized and have low reproducibility. Summary of the Invention

[0004] The purpose of this invention is to provide a drilling leak prevention and plugging material and a two-stage pressure-bearing plugging method to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] This invention provides a two-step pressure-bearing plugging method for drilling leak prevention and plugging materials, comprising the following steps:

[0007] S1. Initial pressure-bearing leak sealing and drill string adjustment:

[0008] 1) Before drilling, inject strong adhesive into the leaking layer for pressure-bearing sealing pretreatment to verify the initial sealing effect of the leaking layer;

[0009] 2) After pulling up the drill string, lower the drill rod to 3-5 meters above the leaking layer, ensuring that the bottom of the drill bit is above the top of the leaking layer to prevent the plugging grout from dispersing too early;

[0010] S2. Preparation of sealing grout:

[0011] 1) Inject the base liquid into the mixing tank;

[0012] 2) Add bentonite to the mixing tank and stir for 3-5 minutes. Then add anti-collapse and anti-blocking agent to the mixing tank and stir for 3-6 minutes. Next, add large crack sealing agent to the mixing tank and stir for 3-4 minutes. Then add cottonseed hulls to the mixing tank and stir for 6-8 minutes. Next, add expanded granules to the mixing tank and stir for 5-7 minutes. Finally, add high-elasticity gel to the mixing tank and stir for 3-6 minutes to obtain the sealing slurry.

[0013] In step 2) above, the stirring speed is 15-25 rpm.

[0014] S3. Injection of sealing grout:

[0015] 1) Start the dual mud pumps, open the valve, and inject the plugging grout into the drill pipe at a discharge rate of 0.3-0.5 m³ / min;

[0016] 2) When the plugging slurry returns from the drill pipe outlet, immediately shut off the well sealer and stop pumping;

[0017] 3) After all the plugging slurry has been injected into the wellbore, continue pumping in the replacement slurry to completely replace the remaining plugging slurry in the drill pipe into the annulus;

[0018] S4, Secondary pulp replacement:

[0019] 1) Pull out 10 drill strings and adjust the drill string position to above the leaking layer;

[0020] 2) Close the well sealer and inject plugging slurry into the annulus. Use the pressure of the liquid column to squeeze all the plugging slurry in the wellbore into the leaking layer. Control the pressure to not exceed 5MPa to complete the pressure plugging.

[0021] As a further optimization of the present invention, the raw materials for preparing the drilling leak prevention and plugging material, by weight, include: 0.5-1.5 parts strong adhesive, 1-6 parts bentonite, 0.5-1.5 parts anti-collapse agent, 5-15 parts large fracture plugging agent, 5-15 parts cottonseed hulls, 5-15 parts cotton fibers, 1-8 parts expanded particles, 0.1-0.3 parts high elasticity gel, 45-60 parts base liquid, and 80-90 parts replacement slurry.

[0022] As a further optimization of the present invention, the slurry replacement fluid is specifically a low-solids slurry.

[0023] As a further optimization of the present invention, the base liquid is specifically water.

[0024] As a further optimization of the present invention, the raw materials for preparing the super glue, by weight, include: 10-16 parts polyurethane glue, 12-16 parts crosslinked polymer gel, 2-4 parts reed, and 3-6 parts ryegrass.

[0025] As a further optimization of the present invention, the preparation process of the strong adhesive is as follows: (i) soaking reed stems in a 1%-5% sodium hydroxide solution, treating at 60-80℃ for 1-2 hours, washing with water until neutral, and drying to obtain dewaxed reeds; (ii) crushing the waxed reeds into reed fibers with a length of 1-5mm; (iii) soaking ryegrass in a 1%-5% sodium hydroxide solution, treating at 60-80℃ for 1-2 hours, washing with water until neutral, and drying to obtain dewaxed ryegrass; (iv) crushing the ryegrass into ryegrass fibers with a length of 0.5-2mm; (v) stirring polyurethane adhesive and cross-linked polymer gel evenly, controlling the stirring time to 20-40min and the stirring speed to 10-30rpm to obtain a mixed adhesive; (vi) adding reed fibers and ryegrass fibers to the mixed adhesive, controlling the stirring time to 60-80min and the stirring speed to 10-30rpm to obtain a strong adhesive.

[0026] The present invention also provides a drilling leak prevention and plugging material, which is applied in the above-mentioned two-stage pressure-bearing leak plugging method.

[0027] The beneficial effects of this invention are as follows: The dual-method pressure-bearing plugging method transforms the original empirical description into a replicable and quantifiable standardized operating procedure through four dimensions: clear technical logic, standardized operation process, improved management efficiency, and optimized on-site applicability. This retains the core technical advantages of the original solution while resolving ambiguities and risks in implementation through structural modifications, significantly improving the success rate and safety of plugging operations. Furthermore, the strong adhesive prepared from reeds, ryegrass, polyurethane glue, and cross-linked polymer gel is filled into the drilling leak prevention and plugging material, increasing the fiber content within the adhesive, thereby enhancing its tensile strength and toughness and optimizing its bonding performance, thus improving the sealing speed of the drilling leak prevention and plugging material. Detailed Implementation

[0028] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] I. Materials

[0030] Unless otherwise specified, all methods used in this invention are conventional methods known to those skilled in the art, and all reagents and materials used are commercially available products.

[0031] (1) In this invention;

[0032] The anti-collapse agent used in this invention is model KFT-1, produced by China Petroleum Engineering Technology Research Institute Co., Ltd.

[0033] The large fracture plugging agent in this invention is the DLJ-1 type polymer fracture plugging agent produced by China Petroleum Engineering Technology Research Institute Co., Ltd.

[0034] The high-elasticity gel used in this invention is CNPC-GEL™ high-elasticity plugging gel produced by the China Petroleum Engineering Technology Research Institute.

[0035] The polyurethane adhesive used in this invention is any one of the WANNATE® series produced by Wanhua Chemical Group Co., Ltd.

[0036] The cross-linked polymer gel used in this invention is model AN934SH manufactured by SNF Floerger SAS.

[0037] In this invention, the low-solids slurry uses the POLY-PLUS® low-solids polymer slurry system manufactured by Baker Hughes Company.

[0038] The expanded particles used in this invention are of model ZJ-100, produced by the Petroleum Engineering Technology Research Institute of China Petrochemical Corporation.

[0039] II. Methods

[0040] Example 1

[0041] A two-step pressure-bearing plugging method for drilling leak prevention and plugging materials includes the following steps:

[0042] S1. Initial pressure-bearing leak sealing and drill string adjustment:

[0043] 1) The preparation process of the super glue is as follows: (i) Soak the reed stems in a 1% sodium hydroxide solution, treat at 60°C for 1 hour, wash with water until neutral, and dry to obtain dewaxed reeds; (ii) Crush the waxed reeds into reed fibers with a length of 1 mm; (iii) Soak the ryegrass in a 1% sodium hydroxide solution, treat at 60°C for 1 hour, wash with water until neutral, and dry to obtain dewaxed ryegrass; (iv) Crush the ryegrass into ryegrass fibers with a length of 0.5 mm; (v) Stir the polyurethane glue and cross-linked polymer gel evenly, control the stirring time to 20 min, control the stirring speed to 10 rpm, and obtain a mixed glue; (vi) Add the reed fibers and ryegrass fibers to the mixed glue, control the stirring time to 60 min, control the stirring speed to 10 rpm, and obtain the super glue;

[0044] 2) Before drilling, inject strong adhesive into the leaking layer for pressure-bearing sealing pretreatment to verify the initial sealing effect of the leaking layer;

[0045] 3) After pulling out the drill string, lower the drill rod to 3 meters above the leaking layer, ensuring that the bottom of the drill bit is above the top of the leaking layer to prevent the plugging grout from dispersing too early;

[0046] S2. Preparation of sealing grout:

[0047] 1) Inject the base liquid into the mixing tank;

[0048] 2) Add bentonite to the mixing tank and stir for 3 minutes. Then add anti-collapse and anti-blocking agent to the mixing tank and stir for 3 minutes. Next, add large crack sealing agent to the mixing tank and stir for 3 minutes. Then add cottonseed hulls to the mixing tank and stir for 6 minutes. Next, add expanded granules to the mixing tank and stir for 5 minutes. Finally, add high-elasticity gel to the mixing tank and stir for 3 minutes to obtain the sealing slurry.

[0049] In step 2) above, the stirring speed is 15 rpm.

[0050] S3. Injection of sealing grout:

[0051] 1) Start the dual mud pumps, open the valve, and inject the plugging slurry into the drill pipe at a discharge rate of 0.3 m³ / min;

[0052] 2) When the plugging slurry returns from the drill pipe outlet, immediately shut off the well sealer and stop pumping;

[0053] 3) After all the plugging slurry has been injected into the wellbore, continue pumping in the replacement slurry to completely replace the remaining plugging slurry in the drill pipe into the annulus;

[0054] S4, Secondary pulp replacement:

[0055] 1) Pull out 10 drill strings and adjust the drill string position to above the leaking layer;

[0056] 2) Close the well sealer and inject plugging slurry into the annulus. Use the pressure of the liquid column to squeeze all the plugging slurry in the wellbore into the leaking layer. Control the pressure to not exceed 5MPa to complete the pressure plugging.

[0057] The raw materials for preparing drilling leak prevention and plugging materials, by weight, include: 0.5 parts strong adhesive, 1 part bentonite, 0.5 parts anti-collapse agent, 5 parts large fracture plugging agent, 5 parts cottonseed hulls, 5 parts cotton fibers, 1 part expanded particles, 0.1 parts high-elasticity gel, 45 parts base liquid (specifically water), and 80 parts replacement mud (specifically low-solids mud).

[0058] The raw materials for preparing the super glue, by weight, include: 10 parts polyurethane glue, 12 parts cross-linked polymer gel, 2 parts reed, and 3 parts ryegrass.

[0059] A drilling leak prevention and plugging material is applied to the above-mentioned two-stage pressure-bearing leak plugging method.

[0060] Example 2

[0061] A two-step pressure-bearing plugging method for drilling leak prevention and plugging materials includes the following steps:

[0062] S1. Initial pressure-bearing leak sealing and drill string adjustment:

[0063] 1) The preparation process of the super glue is as follows: (i) Soak the reed stems in a 3% sodium hydroxide solution, treat at 70°C for 1.5 hours, wash with water until neutral, and dry to obtain dewaxed reeds; (ii) Crush the waxed reeds into reed fibers with a length of 3 mm; (iii) Soak the ryegrass in a 3% sodium hydroxide solution, treat at 70°C for 1.5 hours, wash with water until neutral, and dry to obtain dewaxed ryegrass; (iv) Crush the ryegrass into ryegrass fibers with a length of 1.3 mm; (v) Stir the polyurethane glue and cross-linked polymer gel evenly, control the stirring time for 30 min, control the stirring speed for 20 rpm, and obtain a mixed glue; (vi) Add the reed fibers and ryegrass fibers to the mixed glue, control the stirring time for 70 min, control the stirring speed for 20 rpm, and obtain the super glue;

[0064] 2) Before drilling, inject strong adhesive into the leaking layer for pressure-bearing sealing pretreatment to verify the initial sealing effect of the leaking layer;

[0065] 3) After pulling out the drill string, lower the drill rod to 4 meters above the leaking layer, ensuring that the bottom of the drill bit is above the top of the leaking layer to prevent the plugging grout from dispersing too early;

[0066] S2. Preparation of sealing grout:

[0067] 1) Inject the base liquid into the mixing tank;

[0068] 2) Add bentonite to the mixing tank and stir for 4 minutes. Then add anti-collapse and anti-blocking agent to the mixing tank and stir for 5 minutes. Next, add large crack sealing agent to the mixing tank and stir for 3.5 minutes. Then add cottonseed hulls to the mixing tank and stir for 7 minutes. Next, add expanded granules to the mixing tank and stir for 6 minutes. Finally, add high-elasticity gel to the mixing tank and stir for 5 minutes to obtain the sealing slurry.

[0069] In step 2) above, the stirring speed is 20 rpm.

[0070] S3. Injection of sealing grout:

[0071] 1) Start the dual mud pumps, open the valve, and inject the plugging slurry into the drill pipe at a discharge rate of 0.4 m³ / min;

[0072] 2) When the plugging slurry returns from the drill pipe outlet, immediately shut off the well sealer and stop pumping;

[0073] 3) After all the plugging slurry has been injected into the wellbore, continue pumping in the replacement slurry to completely replace the remaining plugging slurry in the drill pipe into the annulus;

[0074] S4, Secondary pulp replacement:

[0075] 1) Pull out 10 drill strings and adjust the drill string position to above the leaking layer;

[0076] 2) Close the well sealer and inject plugging slurry into the annulus. Use the pressure of the liquid column to squeeze all the plugging slurry in the wellbore into the leaking layer. Control the pressure to not exceed 5MPa to complete the pressure plugging.

[0077] The raw materials for preparing drilling leak prevention and plugging materials, by weight, include: 1 part strong adhesive, 3 parts bentonite, 1 part anti-collapse agent, 10 parts large fracture plugging agent, 10 parts cottonseed hulls, 10 parts cotton fibers, 4 parts expanded particles, 0.2 parts high-elasticity gel, 53 parts base liquid (specifically water), and 85 parts replacement mud (specifically low-solids mud).

[0078] The raw materials for preparing the super glue, by weight, include: 13 parts polyurethane glue, 14 parts cross-linked polymer gel, 3 parts reed, and 4 parts ryegrass.

[0079] A drilling leak prevention and plugging material is applied to the above-mentioned two-stage pressure-bearing leak plugging method.

[0080] Example 3

[0081] A two-step pressure-bearing plugging method for drilling leak prevention and plugging materials includes the following steps:

[0082] S1. Initial pressure-bearing leak sealing and drill string adjustment:

[0083] 1) The preparation process of the super glue is as follows: (i) Soak the reed stems in a 5% sodium hydroxide solution, treat at 80°C for 2 hours, wash with water until neutral, and dry to obtain dewaxed reeds; (ii) Crush the waxed reeds into reed fibers with a length of 5 mm; (iii) Soak the ryegrass in a 5% sodium hydroxide solution, treat at 80°C for 2 hours, wash with water until neutral, and dry to obtain dewaxed ryegrass; (iv) Crush the ryegrass into ryegrass fibers with a length of 0.2 mm; (v) Stir the polyurethane glue and cross-linked polymer gel evenly, control the stirring time to 40 min, control the stirring speed to 30 rpm, and obtain the mixed glue; (vi) Add the reed fibers and ryegrass fibers to the mixed glue, control the stirring time to 80 min, control the stirring speed to 30 rpm, and obtain the super glue;

[0084] 2) Before drilling, inject strong adhesive into the leaking layer for pressure-bearing sealing pretreatment to verify the initial sealing effect of the leaking layer;

[0085] 3) After pulling out the drill string, lower the drill rod to 5 meters above the leaking layer, ensuring that the bottom of the drill bit is above the top of the leaking layer to prevent the plugging grout from dispersing too early;

[0086] S2. Preparation of sealing grout:

[0087] 1) Inject the base liquid into the mixing tank;

[0088] 2) Add bentonite to the mixing tank and stir for 5 minutes. Then add anti-collapse and anti-blocking agent to the mixing tank and stir for 6 minutes. Next, add large crack sealing agent to the mixing tank and stir for 4 minutes. Then add cottonseed hulls to the mixing tank and stir for 8 minutes. Next, add expanded granules to the mixing tank and stir for 7 minutes. Finally, add high-elasticity gel to the mixing tank and stir for 6 minutes to obtain the sealing slurry.

[0089] In step 2) above, the stirring speed is 25 rpm.

[0090] S3. Injection of sealing grout:

[0091] 1) Start the dual mud pumps, open the valve, and inject the plugging grout into the drill pipe at a discharge rate of 0.5 m³ / min;

[0092] 2) When the plugging slurry returns from the drill pipe outlet, immediately shut off the well sealer and stop pumping;

[0093] 3) After all the plugging slurry has been injected into the wellbore, continue pumping in the replacement slurry to completely replace the remaining plugging slurry in the drill pipe into the annulus;

[0094] S4, Secondary pulp replacement:

[0095] 1) Pull out 10 drill strings and adjust the drill string position to above the leaking layer;

[0096] 2) Close the well sealer and inject plugging slurry into the annulus. Use the pressure of the liquid column to squeeze all the plugging slurry in the wellbore into the leaking layer. Control the pressure to not exceed 5MPa to complete the pressure plugging.

[0097] The raw materials for preparing the drilling leak prevention and plugging material, by weight, include: 1.5 parts strong adhesive, 6 parts bentonite, 1.5 parts anti-collapse agent, 15 parts large fracture plugging agent, 15 parts cottonseed hulls, 15 parts cotton fibers, 8 parts expanded particles, 0.3 parts high-elasticity gel, 60 parts base liquid (specifically water), and 90 parts replacement mud (specifically low-solids mud).

[0098] The raw materials for preparing the super glue, by weight, include: 16 parts polyurethane glue, 16 parts cross-linked polymer gel, 4 parts reed, and 6 parts ryegrass.

[0099] A drilling leak prevention and plugging material is applied to the above-mentioned two-stage pressure-bearing leak plugging method.

[0100] The usage methods in Examples 1-3 were tested according to SY / T 5613-2016 "Drilling Fluid Testing Procedures";

[0101] The results are shown in the following tables (Table 1, Table 2, Table 3):

[0102] Group Apparent viscosity (mPa·s) Plastic viscosity (mPa·s) Dynamic shear force (Pa) Example 1 Conventional wells: 98 deep wells / High-temperature wells: 58 Conventional wells: 25 deep wells / High-temperature wells: 15 Conventional wells: 15 deep wells / Extended reach wells: 23 Example 2 Conventional wells: 53 deep wells / High-temperature wells: 33 Conventional wells: 13 deep wells / High-temperature wells: 9 Conventional wells: 10 deep wells / Extended reach wells: 15 Example 3 Conventional wells: 87 deep wells / High-temperature wells: 57 Conventional wells: 24 deep wells / High-temperature wells: 13 Conventional wells: 14 deep wells / Extended reach wells: 11

[0103] Table 1

[0104] Group API filtration loss (mL) High-temperature and high-pressure filtration loss (mL) Example 1 Freshwater base: 11; Saltwater base: 15 Freshwater base: 16; Saltwater base: 23 Comparative Example 2 Freshwater base: 7%; Saltwater base: 10% Freshwater base: 13; Saltwater base: 18 Example 3 Freshwater base: 12; Saltwater base: 14 Freshwater base: 15.5%; Saltwater base: 25%.

[0105] Table 2

[0106] Group Extreme pressure lubrication coefficient (dimensionless) Mud cake friction coefficient (dimensionless) Example 1 0.15 (water-based) 0.07 (oil-based) 0.091 Example 2 0.10 (water-based) 0.044 (oil-based) 0.078 Example 3 0.18 (water-based) 0.077 (oil-based) 0.085

[0107] Table 3

[0108] As can be seen from Tables 1, 2, and 3 above, the pressure-bearing leak sealing method of Example 2 is the best compared with Example 1 and Example 3. The pressure-bearing leak sealing method of Example 2 transforms the original empirical description into a replicable and quantifiable standardized operating procedure through four dimensions: clear technical logic, standardized operation process, improved management efficiency, and optimized on-site applicability. It not only retains the core technical advantages of the original solution, but also solves the ambiguities and risks in the implementation through structural transformation, which significantly improves the success rate and safety of the leak sealing operation.

[0109] The effects of reeds and ryegrass on the properties of super glue

[0110] (1) The preparation method of the super glue is described in 2.1-(1), wherein the super glue described in the table below is used to replace the super glue in Example 2.

[0111] The raw material composition of super glue is shown in the table below:

[0112] Group polyurethane adhesive Cross-linked polymer gel reed Ryegrass Example 2 13 14 3 4 Comparative Example 1 16 18 - - Comparative Example 2 16 18 - 7 Comparative Example 3 16 18 7 -

[0113] Note: "-" indicates no addition.

[0114] (2) The following test methods were used to test the performance of drilling leak prevention and plugging materials.

[0115] ① The "Indoor Test Method for Bridging and Plugging Materials for Drilling Fluids" (SY / T 5840-2007) tests the sealing time of the drilling leakage prevention and plugging materials prepared in Example 2 and Comparative Examples 1-3.

[0116] The results are shown in the table below:

[0117] Group Blocking time (min) Example 2 33 Comparative Example 1 78 Comparative Example 2 61 Comparative Example 3 58

[0118] As can be seen from the table above, compared with Comparative Examples 1-3, the drilling leak prevention and plugging material prepared in Example 2 is the best. The strong adhesive prepared by reed, ryegrass, polyurethane adhesive and cross-linked polymer gel is filled into the drilling leak prevention and plugging material, which increases the amount of fiber in the strong adhesive, thereby enhancing the tensile strength and toughness of the strong adhesive and optimizing the bonding performance, thus improving the sealing speed of the drilling leak prevention and plugging material.

[0119] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A two-stage pressure-bearing plugging method for drilling leak prevention and plugging materials, characterized in that, Includes the following steps: S1. Initial pressure-bearing leak sealing and drill string adjustment: 1) Before drilling, inject strong adhesive into the leaking layer for pressure-bearing sealing pretreatment to verify the initial sealing effect of the leaking layer; 2) After pulling up the drill string, lower the drill rod to 3-5 meters above the leaking layer, ensuring that the bottom of the drill bit is above the top of the leaking layer to prevent the plugging grout from dispersing too early; S2. Preparation of sealing grout: 1) Inject the base liquid into the mixing tank; 2) Add bentonite to the mixing tank and stir for 3-5 minutes. Then add anti-collapse and anti-blocking agent to the mixing tank and stir for 3-6 minutes. Next, add large crack sealing agent to the mixing tank and stir for 3-4 minutes. Then add cottonseed hulls to the mixing tank and stir for 6-8 minutes. Next, add expanded granules to the mixing tank and stir for 5-7 minutes. Finally, add high-elasticity gel to the mixing tank and stir for 3-6 minutes to obtain the sealing slurry. In step 2) above, the stirring speed is 15-25 rpm. S3. Injection of sealing grout: 1) Start the dual mud pumps, open the valve, and inject the plugging grout into the drill pipe at a discharge rate of 0.3-0.5 m³ / min; 2) When the plugging slurry returns from the drill pipe outlet, immediately shut off the well sealer and stop pumping; 3) After all the plugging slurry has been injected into the wellbore, continue pumping in the replacement slurry to completely replace the remaining plugging slurry in the drill pipe into the annulus; S4, Secondary pulp replacement: 1) Pull out 10 drill strings and adjust the drill string position to above the leaking layer; 2) Close the well sealer and inject plugging slurry into the annulus. Use the pressure of the liquid column to squeeze all the plugging slurry in the wellbore into the leaking layer. Control the pressure to not exceed 5MPa to complete the pressure plugging.

2. The dual-method pressure-bearing plugging method for drilling leak prevention and plugging materials according to claim 1, characterized in that, in, The raw materials for preparing the drilling leak prevention and plugging material, by weight, include: 0.5-1.5 parts strong adhesive, 1-6 parts bentonite, 0.5-1.5 parts anti-collapse agent, 5-15 parts large fracture plugging agent, 5-15 parts cottonseed hulls, 5-15 parts cotton fibers, 1-8 parts expanded particles, 0.1-0.3 parts high-elasticity gel, 45-60 parts base liquid, and 80-90 parts replacement slurry.

3. The dual-method pressure-bearing plugging method for drilling leak prevention and plugging materials according to claim 1, characterized in that, The slurry replacement fluid is specifically a low-solids slurry.

4. The dual-method pressure-bearing plugging method for drilling leak prevention and plugging materials according to claim 1, characterized in that, The base liquid is specifically water.

5. The dual-method pressure-bearing plugging method for drilling leak prevention and plugging materials according to claim 1, characterized in that, in, The raw materials for preparing the super adhesive, by weight, include: 10-16 parts polyurethane adhesive, 12-16 parts crosslinked polymer gel, 2-4 parts reed, and 3-6 parts ryegrass.

6. The dual-method pressure-bearing plugging method for drilling leak prevention and plugging materials according to claim 5, characterized in that, The preparation process of the super glue is as follows: (i) Soaking reed stems in a 1%-5% sodium hydroxide solution, treating at 60-80℃ for 1-2 hours, washing with water until neutral, and drying to obtain dewaxed reeds; (ii) Crushing the waxed reeds into reed fibers with a length of 1-5mm; (iii) Soaking ryegrass in a 1%-5% sodium hydroxide solution, treating at 60-80℃ for 1-2 hours, washing with water until neutral, and drying to obtain dewaxed ryegrass; (iv) Crushing the ryegrass into ryegrass fibers with a length of 0.5-2mm; (v) Stirring the polyurethane glue and cross-linked polymer gel evenly, controlling the stirring time to 20-40min and the stirring speed to 10-30rpm to obtain a mixed glue; (vi) Adding the reed fibers and ryegrass fibers to the mixed glue, controlling the stirring time to 60-80min and the stirring speed to 10-30rpm to obtain a super glue.

7. A drilling leak prevention and plugging material, which is applied in the above-mentioned two-stage pressure-bearing leak plugging method.