Polymer emulsion plugging material as well as preparation method and application thereof

Abstract

The invention discloses a polymer emulsion plugging material and a preparation method and application thereof, the polymer emulsion plugging material comprises a component A and a component B, the component A is a polymer emulsion, the component B is a cross-linking agent emulsion, and the mass ratio of the component A to the component B is 100: (5-50). Through reverse emulsion polymerization, the polymer and the cross-linking agent are concentrated in the emulsion, after formation water in a leakage layer is encountered, rapid demulsification and thickening can be achieved, a thick plug is formed to plug the leakage layer, the polymer and the cross-linking agent in the plugging layer are subjected to a cross-linking reaction at the high temperature of the leakage layer, the strength of the plugging layer is further improved, and the effect of plugging large fractures and cavities is achieved. The defect that pumpability and residence of a conventional underground cross-linked gel system are difficult to balance is overcome, and the underground cross-linked gel has the characteristics that the viscosity is low before the underground cross-linked gel enters a leakage layer, the underground cross-linked gel is quickly demulsified and thickened after entering the leakage layer and meeting water, and the leakage layer is controllably cross-linked at a high temperature.

Description

Technical Field

[0001] This invention belongs to the technical field of oil drilling plugging materials, specifically relating to a polymer emulsion plugging material, its preparation method, and its application. Background Technology

[0002] In oil and gas drilling, encountering large fractures and cavities can easily lead to severe lost circulation (WSLOs). Currently, the commonly used plugging materials for dealing with WSLOs are gels and cement. However, in large fractures and leaky formations with well-developed formation water, cement has drawbacks such as poor resistance to water runoff and weak retention performance. Due to its unique rheological properties, gel materials show significantly improved resistance to water runoff and retention performance in fractures compared to cement.

[0003] Chinese patent CN2023107180108 discloses a dual-network hydrogel plugging agent, whose main components are 0.41%-0.42% 2-acrylamido-2-methylpropanesulfonic acid; 14%-14.5% acrylamide; 0.012%-0.014% N,N′-methylenebisacrylamide crosslinking agent; 0.028%-0.032% ketoglutaric acid free radical initiator; and 85%-85.5% deionized water. This agent can significantly improve the mechanical strength of the dual-network hydrogel within the temperature range of 25-90℃. Chinese patent 2019112151908 discloses a temperature-controllable gel plugging agent, mainly composed of polyacrylamide, a crosslinking agent, and expanded graphite. When the gel plug reaches the leakage layer, it rapidly gels due to the temperature rise, increasing its strength. Simultaneously, the expandable graphite also rapidly expands due to the temperature rise, forming a three-dimensional network structure with a stable framework, which interacts with the gelling liquid through intermolecular interactions. Further efforts are needed to enhance the gel strength after gelation, thereby improving the sealing and temperature resistance of the plugging system. Chinese Patent 2022101549186 discloses a supramolecular gel plugging agent for fractured formations, comprising 18-45% copolymer monomers, 0.5-6.0% surfactant, 0.1-2.0% initiator, 0.1-2.0% cosolvent, 0.05-0.5% accelerator, 0.5-5% brine solution, and the balance being water. Based on non-covalent interactions, it exhibits excellent mechanical properties and outstanding environmental responsiveness, with a pressure resistance exceeding 14 MPa and a temperature resistance of 180℃. Current gel plugging agents are mainly pure polymer solutions, which suffer from the drawback of difficulty in balancing pumpability and retention. Furthermore, the crosslinking agent and polymer are already mixed and contacted during injection, posing a risk of premature crosslinking. Therefore, there is an urgent need to develop a gel plugging system with low viscosity before entering the leaking layer, rapid thickening upon contact with water in the leaking layer, and controllable crosslinking after entering the leaking layer. Summary of the Invention

[0004] To address the technical shortcomings of downhole crosslinked gel systems, such as difficulty in balancing pumpability and retention, and uncontrollable crosslinking time, the present invention aims to: 1) provide a polymer emulsion plugging material; 2) provide a method for preparing the polymer emulsion plugging material; and 3) provide applications of the polymer emulsion plugging material.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A polymer emulsion sealing material comprises two components, A and B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:(5~50).

[0006] Furthermore, the preparation method of component A is as follows: a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A.

[0007] As a further optimization of the present invention, the grease is one of diesel oil, liquid paraffin, and No. 3 white oil; the emulsifier is one of Span80, fatty alcohol polyoxyethylene ether AEO-5, and octylphenol polyoxyethylene ether OP-7.

[0008] As a further preferred embodiment of the present invention, in step b, the monomer solution is composed of an aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid, an aqueous solution of acrylamide, and an aqueous solution of dimethyldiallylammonium chloride, wherein the molar ratio of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and dimethyldiallylammonium chloride is (3~7):(2~5):1.

[0009] As a further optimization of the present invention, in step c, the initiator is one of ammonium persulfate, azobisisobutyronitrile, or potassium persulfate.

[0010] Furthermore, the preparation method of component B is as follows: Take 200g of diesel oil, add 5g-10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel oil in the crosslinking agent aqueous solution, stir evenly, and you will get component B.

[0011] As a further preferred embodiment of the present invention, the crosslinking agent is one of boric acid, chromium acetate, zirconium trichloride, aluminum sulfate, and hexamethylenetetramine.

[0012] As a further preferred embodiment of the present invention, the mass fraction of the crosslinking agent in the crosslinking agent aqueous solution is 1% to 30%.

[0013] This invention further protects a method for preparing a polymer emulsion plugging material, comprising the following steps: S1. Preparation of component A a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A; S2. Preparation of component B Take 200g of diesel oil, add 5g~10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel oil in the crosslinking agent aqueous solution, stir evenly, and obtain component B; S3. Preparation of polymer emulsion plugging materials Mix component A and component B at a mass ratio of 100:(5~50) until homogeneous to obtain the polymer emulsion plugging material.

[0014] This invention further protects the application of the above-mentioned polymer emulsion plugging material in drilling in fractured formations.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. This invention utilizes reverse emulsion polymerization to concentrate the polymer and crosslinking agent within an emulsion. Upon encountering formation water in the lost circulation zone, the emulsion rapidly demulsifies and thickens, forming a thick plug to seal the lost circulation zone. Furthermore, at the high temperature of the lost circulation zone, the polymer and crosslinking agent in the plugging layer undergo a crosslinking reaction, further enhancing the strength of the plugging layer and achieving the effect of sealing large fractures and voids. This overcomes the shortcomings of conventional downhole crosslinked gel systems, which struggle to balance pumpability and retention. It features low viscosity before entering the lost circulation zone, rapid demulsification and thickening upon encountering water, and controllable crosslinking at high temperatures within the lost circulation zone.

[0016] 2. The polymer emulsion plugging material prepared by the present invention can rapidly demulsify and thicken within 10 seconds after contact with water, and the crosslinking time can be controlled from 1 to 10 hours at 60-150℃. After crosslinking, the pressure bearing capacity can reach more than 5MPa.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other design solutions and drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 Viscosity-time curves for Examples 2 and 3; Figure 2 The image shows the viscosity-shear rate curve after thickening with water in the example. Figure 3 The graph shows the G′ / G″ viscoelastic curves after crosslinking in the examples (Example 5 was not crosslinked).

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Detailed Implementation

[0021] The invention can be further understood in conjunction with the following detailed description of preferred embodiments and included examples. Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. If any definition of a specific term disclosed in the prior art differs from any definition provided herein, the definition provided herein shall prevail.

[0022] It should be noted that the implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not specified are usually those in conventional experiments. Unless otherwise specified, the preparation methods mentioned in this invention are all conventional methods; unless otherwise specified, all chemical reagents and chemicals mentioned in the following examples are commercially available.

[0023] In a typical embodiment of this application, a polymer emulsion plugging material is provided, comprising two components, A and B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:(5~50).

[0024] Specifically, the preparation method of component A is as follows: a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A.

[0025] The preparation method of component B is as follows: Take 200g of diesel (liquid paraffin or white oil can also be used), add 5g-10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel in the crosslinking agent aqueous solution, stir evenly, and you will get component B.

[0026] As a further improvement to the above-mentioned technical solution of the present invention, the grease is one of diesel oil, liquid paraffin, and No. 3 white oil; the emulsifier is one of Span80, fatty alcohol polyoxyethylene ether AEO-5, and octylphenol polyoxyethylene ether OP-7. As a further preferred embodiment of the present invention, in step b, the monomer solution is composed of an aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), an aqueous solution of acrylamide (AM), and an aqueous solution of dimethyl diallyl ammonium chloride (DMDAAC), wherein the molar ratio of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and dimethyl diallyl ammonium chloride is (3~7):(2~5):1.

[0027] As a further preferred embodiment of the present invention, the mass fraction of monomers (AMPS, AM, DMDAAC) in the AM aqueous solution, AM aqueous solution, and DMDAAC aqueous solution is 30% to 50%.

[0028] The mass fraction of the crosslinking agent in the aqueous solution is 1% to 30%.

[0029] As a further optimization of the present invention, in step c, the initiator is one of ammonium persulfate, azobisisobutyronitrile, or potassium persulfate.

[0030] As a further preferred embodiment of the present invention, the crosslinking agent is one of boric acid, chromium acetate, zirconium trichloride, aluminum sulfate, and hexamethylenetetramine.

[0031] This invention further protects a method for preparing a polymer emulsion plugging material, comprising the following steps: S1. Preparation of component A a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A; S2. Preparation of component B Take 200g of diesel oil, add 5g~10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel oil in the crosslinking agent aqueous solution, stir evenly, and obtain component B; S3. Preparation of polymer emulsion plugging materials Mix component A and component B at a mass ratio of 100:(5~50) until homogeneous to obtain the polymer emulsion plugging material.

[0032] This invention further protects the application of the above-mentioned polymer emulsion plugging material in drilling in fractured formations.

[0033] The present invention will be further described below with reference to embodiments. It should be further noted that the following embodiments involve the following test methods: (1) Water thickening time test: Take 20g of the present invention and mix it with 20g of the present invention. Stir at 100rpm. Stop the time when the white viscous substance shows the climbing effect. This is the water thickening time.

[0034] (2) High temperature crosslinking time test: Take 20g of the present invention and mix it with 20g of the present invention. After stirring to break the emulsion and thicken, take out the white viscous substance and use the Anton Paar rheometer to test the high temperature and high pressure rheological properties. Keep the shear rate of 100s-1 constant and continue to heat at a certain temperature. Record the time when the viscosity suddenly increases, which is the high temperature crosslinking time.

[0035] (3) Strength test after cross-linking: Take the sample after the high temperature cross-linking time test and use the Anton Paar rheometer to test its viscoelastic modulus G′ and G″.

[0036] (4) Leakage plugging test: Using a high-temperature and high-pressure filtration apparatus, 10mm diameter pebbles were selected and a 10cm thick layer of pebbles was laid at the bottom to simulate a large crack leakage layer. A 10cm thick layer of the polymer of this invention after water demulsification was laid on the pebble layer, and finally a 10cm layer of 5% bentonite slurry was poured on top. After sealing, the mixture was heated at high temperature for a certain period of time until the polymer was completely cross-linked. Then, nitrogen gas was continuously pressurized until the drilling fluid broke through the pebble layer and flowed out. The pressure was the pressure-bearing capacity of the sample.

[0037] Example 1: This application provides a polymer emulsion plugging material, comprising component A and component B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:12.

[0038] The preparation method of component A is as follows: 4g of emulsifier Span80 is added to 200g of diesel oil and mixed evenly. Then, 70g of monomer solution is added. The monomer solution is composed of aqueous solutions of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), and dimethyldiallylammonium chloride (DMDAAC), wherein the total mass of monomers AMPS, AM, and DMDAAC is 35g and the molar ratio of AMPS, AM, and DMDAAC is 3:3:1. The temperature is raised to 50℃ and the reaction is carried out for 3.5h to finally obtain the polymer emulsion of component A.

[0039] The preparation method of component B is as follows: 200g of diesel oil is added to 10g of Span80 and mixed evenly, and 40g of boric acid aqueous solution is added, wherein the mass fraction of boric acid in the boric acid aqueous solution is 3.6%.

[0040] Through experimental testing, the thickening time of Example 1 was 8 seconds, the crosslinking time at 80℃ was 3.5 hours, and the viscosity decreased with increasing shear rate, exhibiting good shear dilution properties. Figure 2 As shown, the viscoelastic modulus curve is shown in the figure. Figure 3 It has good viscoelastic properties, and its compressive strength is 4.6 MPa under crosslinking at 80℃.

[0041] Example 2: This application provides a polymer emulsion plugging material, comprising component A and component B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:20.

[0042] The preparation method of component A is as follows: 4g of emulsifier Span80 is added to 200g of diesel oil and mixed evenly. Then, 70g of monomer solution is added. The monomer solution is composed of an aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), an aqueous solution of acrylamide (AM), and an aqueous solution of dimethyldiallylammonium chloride (DMDAAC). The total mass of monomers AMPS, AM, and DMDAAC is 35g, and the molar ratio of AMPS, AM, and DMDAAC is 3:3:1. The mixture is heated to 50℃ and reacted for 3.5h to finally obtain the polymer emulsion of component A.

[0043] The preparation method of component B is as follows: 200g of diesel oil is added to 10g of Span80 and mixed evenly, and 68g of boric acid aqueous solution is added, wherein the mass fraction of boric acid in the boric acid aqueous solution is 4.5%.

[0044] Through experimental testing, the thickening time of Example 1 was 9 seconds, and the crosslinking time at 80°C was 1.0 h (see...). Figure 1 The viscosity decreases with increasing shear rate, exhibiting good shear dilution properties, and has the highest overall viscosity, such as... Figure 2 As shown, the viscoelastic modulus curve is shown in the figure. Figure 3 It has good viscoelastic properties, and its compressive strength is 5.2 MPa under crosslinking at 80℃.

[0045] Example 3 (120℃): This application provides a polymer emulsion plugging material, comprising component A and component B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:10.

[0046] The preparation method of component A is as follows: 8.5g of emulsifier Span80 is added to 200g of diesel oil and mixed thoroughly. Then, 76g of monomer solution is added. The monomer solution is composed of aqueous solutions of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), and dimethyldiallylammonium chloride (DMDAAC), with a total mass of 31g and a molar ratio of 5:2:1. The mixture is heated to 50℃ and reacted for 6 hours to obtain the polymer emulsion of component A.

[0047] The preparation method of component B is as follows: 200g of diesel oil is added to 10g of Span80 and mixed and stirred evenly, and 40g of aluminum sulfate solution is added, wherein the mass fraction of sulfuric acid in the aluminum sulfate solution is 12%.

[0048] Through experimental testing, the thickening time in Example 2 was 7 seconds, and the crosslinking time at 120°C was 4.9 hours (see [link]). Figure 1 The viscosity decreases with increasing shear rate, exhibiting good shear dilution properties, such as... Figure 2 As shown, the viscoelastic modulus curve is shown in the figure. Figure 3 It has good viscoelastic properties, and its compressive strength is 3.9 MPa under crosslinking at 120℃.

[0049] Example 4 (150℃): This application provides a polymer emulsion plugging material, comprising component A and component B, wherein component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:10.

[0050] The preparation method of component A is as follows: 8.5g of emulsifier Span80 is added to 200g of diesel oil and mixed thoroughly. Then, 66g of monomer solution is added. The monomer solution is composed of aqueous solutions of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), and dimethyldiallylammonium chloride (DMDAAC), with a total mass of 28g and a molar ratio of 7:2:1. The mixture is heated to 50℃ and reacted for 8 hours to obtain the polymer emulsion of component A.

[0051] The preparation method of component B is as follows: 200g of diesel oil is added to 10g of Span80, mixed and stirred evenly, and then 48g of hexamethylenetetramine solution is added, wherein the mass fraction of hexamethylenetetramine in the hexamethylenetetramine solution is 23%.

[0052] Experimental tests showed that Example 2 had a thickening time of 8 seconds, a crosslinking time of 3.4 hours at 150°C, and its viscosity decreased with increasing shear rate, exhibiting good shear dilution properties. Figure 2 As shown, the viscoelastic modulus curve is shown in the figure. Figure 3 It has good viscoelastic properties, and its compressive strength is 5.6 MPa under crosslinking at 150℃.

[0053] Example 5 (150℃): Only component A polymer emulsion was used. The preparation method for component A was as follows: 8.5g of emulsifier Span80 was added to 200g of diesel oil and mixed thoroughly. Then, 66g of monomer solution was added. This monomer solution was composed of an aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), an aqueous solution of acrylamide (AM), and an aqueous solution of dimethyldiallylammonium chloride (DMDAAC). The total mass of monomers AMPS, AM, and DMDAAC was 28g, and the molar ratio of AMPS, AM, and DMDAAC was 7:2:1. The mixture was heated to 50℃ and reacted for 8 hours to finally obtain the component A polymer emulsion.

[0054] Example 5 showed a thickening time of 8 seconds, failed to crosslink at 150°C, and exhibited a significantly lower viscosity compared to Examples 1-4. Figure 2 As shown, the viscoelastic modulus curve is shown in the figure. Figure 3 The viscoelastic modulus is significantly lower than that of Examples 1-4, and the pressure resistance at 150°C is 0.8 MPa.

[0055] The above description is merely a preferred embodiment of the present invention and is illustrative in nature, not intended to limit the scope of the invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the invention should fall within the protection scope defined by the claims.

Claims

1. A polymer emulsion sealing material, characterized in that, It includes two components, A and B, where component A is a polymer emulsion and component B is a crosslinking agent emulsion, and the mass ratio of component A to component B is 100:(5~50).

2. The polymer emulsion plugging material as described in claim 1, characterized in that, The preparation method of component A is as follows: a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A.

3. The polymer emulsion plugging material as described in claim 2, characterized in that: The grease is one of diesel oil, liquid paraffin, or No. 3 white oil; The emulsifier is one of Span80, fatty alcohol polyoxyethylene ether AEO-5, and octylphenol polyoxyethylene ether OP-7.

4. The polymer emulsion plugging material as described in claim 2, characterized in that: In step b, the monomer solution is composed of an aqueous solution of 2-acrylamido-2-methylpropanesulfonic acid, an aqueous solution of acrylamide, and an aqueous solution of dimethyldiallylammonium chloride, wherein the molar ratio of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, and dimethyldiallylammonium chloride is (3~7):(2~5):

1.

5. The polymer emulsion plugging material as described in claim 2, characterized in that: In step c, the initiator is one of ammonium persulfate, azobisisobutyronitrile, or potassium persulfate.

6. The polymer emulsion plugging material as described in claim 1, characterized in that, The preparation method of component B is as follows: Take 200g of diesel oil, add 5g-10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel oil in the crosslinking agent aqueous solution, stir evenly, and you will get component B.

7. The polymer emulsion plugging material as described in claim 6, characterized in that: The crosslinking agent is one of boric acid, chromium acetate, zirconium trichloride, aluminum sulfate, and hexamethylenetetramine.

8. The polymer emulsion plugging material as described in claim 6, characterized in that: The mass fraction of the crosslinking agent in the aqueous solution is 1% to 30%.

9. A method for preparing a polymer emulsion plugging material, characterized in that, Includes the following steps: S1. Preparation of component A a. Take 200g of oil, add 5g~10g of emulsifier, and mix well; b. Add a monomer solution with a pH value of 9-10, accounting for 30%-40% of the total mass of diesel, stir evenly, stir at a speed of 800-1200 rpm for 20-40 minutes, and purge with nitrogen to form a stable water-in-oil emulsion. c. Add 0.2% to 0.5% of the total mass of the monomer solution to the water-in-oil emulsion, heat to 50°C, and react for 1 to 8 hours to finally obtain component A; S2. Preparation of component B Take 200g of diesel oil, add 5g~10g of Span80, mix and stir evenly, then add 20%~60% of the total mass of diesel oil in the crosslinking agent aqueous solution, stir evenly, and obtain component B; S3. Preparation of polymer emulsion plugging materials Mix component A and component B at a mass ratio of 100:(5~50) until homogeneous to obtain the polymer emulsion plugging material.

10. An application of a polymer emulsion plugging material, comprising the polymer emulsion plugging material according to any one of claims 1-8 or the polymer emulsion plugging material prepared by the preparation method according to claim 9, characterized in that, Application of the polymer emulsion plugging material in fractured formation drilling.

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