Plugging agent composition and application thereof

Abstract

The invention provides a plugging agent composition and application thereof. The plugging agent composition comprises modified lignin, a resin emulsion, a filler, a stabilizer, a cross-linking agent and water, the curing time of the plugging agent composition is adjustable, and an elastomer formed after curing is high in deformation capacity, has enough compression stress, is good in high-temperature and high-salt resistance and can better adapt to changes of holes and pores in a high-temperature and high-salt environment; and the water plugging agent is low in cost, simple in preparation process, simple to operate during field use, good in field adaptability and suitable for water plugging operation of high-temperature and high-salt carbonate fractured-vuggy reservoirs.

Description

Technical Field

[0001] The invention belongs to the technical field of water blocking and production improvement during high-temperature oil field exploitation, and in particular relates to a blocking agent composition and application thereof. Background Art

[0002] my country's carbonate fracture-vuggy reservoirs are widely distributed and hold enormous reserves, making them the primary driver of increased reserves and production. As development depth increases, the number of ultra-high-temperature oil wells increases, and the formation environment exhibits ultra-high temperature, high salinity, and high water content, necessitating urgent chemical water control and plugging. Furthermore, fracture-vuggy carbonate reservoirs form irregular fracture-vuggy bodies dominated by weathering crusts along large fault zones, presenting a karst dissolution landform. These reservoirs are characterized by strong reservoir heterogeneity and diverse spatial types, primarily large caves, dissolution pores, dissolution pores, and large fractures. Therefore, plugging agents must possess not only heat and salt resistance but also strong deformation capabilities to effectively adapt to changes in the formation's pores and vugs under high temperature and high pressure.

[0003] Conventional polymer plugging agents currently in use, such as polyacrylamide gel, have good viscoelasticity and gel-forming properties, but they exhibit rapid hydrolysis at high temperatures, poor heat and salt tolerance, and low plugging strength, making them unsuitable for high-temperature environments. Reported resin plugging agents, such as silicone resins, offer good heat resistance and plugging effectiveness, but are expensive. Furthermore, some resins require the use of organic solvents, resulting in poor field application results and hindering large-scale promotion and application. Therefore, it is necessary to develop a plugging agent that is resistant to high temperatures and salt levels, exhibits strong deformability, exhibits high plugging strength, is low-cost, and has good field adaptability to meet the plugging needs of carbonate reservoirs. Summary of the Invention

[0004] The invention provides a plugging agent composition, which comprises modified lignin, resin emulsion, filler, stabilizer, cross-linking agent and water.

[0005] According to a specific embodiment of the present invention, taking the mass of the plugging agent composition as 100%, the plugging agent composition includes 3.7-6.1 wt% of the modified lignin, 2.3-15 wt% of the resin emulsion, 0.3-5 wt% of the filler, 0.02-2.3 wt% of the stabilizer, 0.3-2.4 wt% of the cross-linking agent, and the balance water.

[0006] According to a specific embodiment of the present invention, taking the mass of the plugging agent composition as 100%, the plugging agent composition includes 3.7-5.7 wt% of the modified lignin, 2.3-5 wt% of the resin emulsion, 1.8-3.0 wt% of the filler, 0.02-0.1 wt% of the stabilizer, 0.3-1 wt% of the cross-linking agent, and the balance water.

[0007] According to a specific embodiment of the present invention, taking the mass of the plugging agent composition as 100%, the plugging agent composition includes 4.5-6.1 wt% of the modified lignin, 8.6-15 wt% of the resin emulsion, 0.3-5 wt% of the filler, 0.6-2.3 wt% of the stabilizer, 0.5-2.4 wt% of the cross-linking agent, and the balance water.

[0008] According to a specific embodiment of the present invention, the modified lignin includes carboxylated lignin and / or lignin sulfonate.

[0009] According to a specific embodiment of the present invention, the lignin sulfonate is at least one selected from the group consisting of sodium lignin sulfonate, calcium lignin sulfonate and iron lignin sulfonate.

[0010] According to a specific embodiment of the present invention, the resin emulsion includes at least one of styrene maleic anhydride emulsion, styrene acrylate emulsion, polyacrylate emulsion and aqueous polyurethane emulsion.

[0011] According to a specific embodiment of the present invention, the filler is selected from at least one of calcium carbonate, talc, kaolin, bentonite and magnesium chloride.

[0012] According to a specific embodiment of the present invention, the average particle size of the filler is 400-2000 mesh.

[0013] According to a specific embodiment of the present invention, the stabilizer is selected from at least one of polycarboxylic acid, polyethylene oxide and polyacrylic acid.

[0014] According to a specific embodiment of the present invention, the molecular weight of the polycarboxylic acid is 5 million to 10 million; and / or

[0015] The molecular weight of the polyethylene oxide is 100,000 to 1,000,000; and / or

[0016] The molecular weight of the polyacrylic acid is 1 million to 3 million.

[0017] According to a specific embodiment of the present invention, the cross-linking agent is selected from at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, zinc oxide, magnesium chloride, triethylenetetramine, diethylenetriamine, methylcyclohexanediamine, p-phenylenediamine, polyetheramine and benzoyl peroxide.

[0018] According to a specific embodiment of the present invention, the plugging agent composition is prepared according to the following steps:

[0019] 1) mixing the modified lignin and water to obtain a modified lignin solution;

[0020] 2) mixing the modified lignin solution with the resin emulsion, filler, and stabilizer to obtain a system to be cross-linked;

[0021] 3) Mixing the system to be cross-linked and the cross-linking agent to obtain the plugging agent composition.

[0022] The application of the plugging agent composition according to the present invention in water plugging in high-temperature and high-salinity oil reservoirs.

[0023] According to a specific embodiment of the present invention, the high temperature is 150-220° C.; and / or the high salt has a mineralization of no more than 210,000 mg / L.

[0024] Beneficial effects of the present invention:

[0025] To address the problems of conventional plugging agents in the prior art, such as insufficient resistance to high temperatures and high salt levels, insufficient deformation capacity, low plugging strength, high cost, and poor field adaptability, the present invention provides a plugging agent composition and its application. Compared with existing plugging agents in the prior art, the present invention has at least the following advantages:

[0026] 1. The curing time and curing speed of the plugging agent composition provided by the present invention are adjustable. Specifically, the curing time at a high temperature of 170°C can be adjusted from 2.5 to 6 hours, and can adapt to high temperature environments within 220°C;

[0027] 2. The elastomer obtained after curing the plugging agent composition provided by the present invention has sufficient strength and good compression resistance. It can recover its original shape within 20 consecutive compressions at a compression ratio of no more than 85%. In practical applications, it can better adapt to changes in pores and holes and achieve effective blocking.

[0028] 3. The elastomer obtained after curing the plugging agent composition provided by the present invention can withstand a high temperature and high salt environment of 150-220°C and a concentration of less than 210,000 mg / L. After aging for 60 days in a high temperature and high salt environment of 150-220°C and 210,000 mg / L, it can still maintain its intact external shape, internal structure, high mechanical strength, and good compression resistance.

[0029] 4. The plugging agent composition provided by the present invention is a liquid plugging agent with low cost and simple preparation process. When used on site, the pre-prepared cross-linking system and the cross-linking agent can be mixed evenly before use. The raw materials used are non-toxic and harmless, the operation is simple, and the field adaptability is good. It is suitable for promotion and use in water plugging operations in high-temperature and high-salinity carbonate fracture-cavity oil reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 13 is a graph showing the change in compression stress versus compression ratio during 20 consecutive compressions of the cured elastomer 3 after one compression;

[0031] Figure 2 The morphology of the cured elastomer 3 after 60 days of aging;

[0032] Figure 3 FIG. 3 is a graph showing how the compression stress changes with the compression ratio during 20 consecutive compressions of the aged cured elastomer 3. FIG. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to examples. However, the examples are merely illustrative and do not limit the present invention in any way.

[0034] The information of some of the raw materials used in the following examples is as follows:

[0035] Sodium lignin sulfonate: South African Borregaard brand sodium lignin sulfonate;

[0036] Calcium lignin sulfonate: South African Borregaard brand calcium lignin sulfonate;

[0037] Iron lignin sulfonate: South African Borregaard brand iron lignin sulfonate;

[0038] Carboxylated lignin: purchased from Tianjin Wood Elf Biotechnology Co., Ltd.

[0039] Polyacrylic acid: molecular weight 3 million, purchased from Jinan Nuochuang Chemical Co., Ltd.

[0040] Polyethylene oxide: molecular weight 500,000, purchased from Beijing Kaitian Innovation Technology Development Co., Ltd.

[0041] Polycarboxylic acid: molecular weight 6 million, purchased from Wuhan Huaxuan High-tech Co., Ltd.

[0042] Waterborne polyurethane emulsion, styrene maleic anhydride emulsion, styrene acrylate emulsion, and polyacrylate emulsion were purchased from Shenzhen Jitian Chemical Co., Ltd.;

[0043] Polyethylene glycol diglycidyl ether: molecular weight 500, purchased from Guangzhou Yuanda New Materials Co., Ltd.

[0044] Polypropylene glycol diglycidyl ether: molecular weight 300, purchased from Guangzhou Yuanda New Materials Co., Ltd.

[0045] Polyetheramine: Model D230, purchased from Huntsman Company, USA.

[0046] In order to more clearly illustrate the technical solution provided by the present invention, some of the terms appearing below are explained here.

[0047] Compression Ratio: This is defined as the rate of change in thickness relative to the initial thickness of the elastomer in the compression direction, as the elastomer is compressed to a certain thickness in the compression direction after the curing of the plugging agent composition. For example, if the initial thickness of an elastomer in the compression direction is 100 mm and the elastomer is compressed to 15 mm in the compression direction, the compression ratio is 85%.

[0048] Compressive Stress: The compressive load applied to a specimen during a compression test divided by the original cross-sectional area of ​​the specimen.

[0049] Example 1

[0050] 1) Weigh 500 g of sodium lignin sulfonate, add 7804 g of water, and stir evenly to obtain a sodium lignin sulfonate solution;

[0051] 2) 200 g of styrene maleic anhydride emulsion, 200 g of talc with an average particle size of 400 mesh, 2.0 g of polyethylene oxide, and sodium lignin sulfonate solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0052] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 58.04 g of ethylene glycol diglycidyl ether and 29.02 g of zinc oxide) were mixed uniformly to obtain a plugging agent composition.

[0053] Example 2

[0054] 1) Weigh 600 g of calcium lignin sulfonate, add 9762.5 g of water, and stir evenly to obtain a calcium lignin sulfonate solution;

[0055] 2) 300 g of aqueous polyurethane emulsion, 200 g of kaolin with an average particle size of 400 mesh, 5.0 g of polyacrylic acid and calcium lignin sulfonate solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0056] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 62.1 g of polyethylene glycol diglycidyl ether and 3.105 g of benzoyl peroxide) were mixed uniformly to obtain a plugging agent composition.

[0057] Example 3

[0058] 1) Weigh 500 g of sodium lignin sulfonate, add 11918 g of water, and stir evenly to obtain a sodium lignin sulfonate solution;

[0059] 2) 500 g of polyacrylate emulsion, 300 g of bentonite with an average particle size of 400 mesh, 6.0 g of polyethylene oxide, and sodium lignin sulfonate solution were mixed and uniformly mixed at a stirring speed of 500 rpm to obtain a system to be cross-linked;

[0060] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 99.18 g of ethylene glycol diglycidyl ether and 16.53 g of methylcyclohexanediamine) were mixed uniformly to obtain a plugging agent composition.

[0061] Example 4

[0062] 1) Weigh 500 g of carboxylated lignin, add 8620 ml of water, and stir evenly to obtain a carboxylated lignin solution;

[0063] 2) 500 g of the styrene acrylate emulsion, 300 g of bentonite with an average particle size of 400 mesh, 10.0 g of polyacrylic acid, and the carboxylated lignin solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0064] 3) The system to be cross-linked and the cross-linking agent (specifically 16.55 g of triethylenetetramine and 16.55 g of benzoyl peroxide) were mixed uniformly to obtain a plugging agent composition.

[0065] Example 5

[0066] 1) Weigh 100 g of iron lignin sulfonate, add 1300 g of water, and stir to obtain an iron lignin sulfonate solution;

[0067] 2) 200 g of styrene maleic anhydride emulsion, 5 g of magnesium chloride with an average particle size of 2000 mesh, 10 g of polycarboxylic acid and lignin sulfonate iron solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0068] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 15 g of propylene glycol diglycidyl ether and 10 g of magnesium chloride) are mixed uniformly to obtain a plugging agent composition.

[0069] Example 6

[0070] 1) Weigh 100 g of iron lignin sulfonate, add 1200 g of water, and stir to obtain an iron lignin sulfonate solution;

[0071] 2) 250 g of styrene acrylate emulsion, 80 g of calcium carbonate with an average particle size of 400 mesh, 30 g of polyethylene oxide, and lignin sulfonate iron solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0072] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 20 g of polypropylene glycol diglycidyl ether and 1 g of benzoyl peroxide) are mixed uniformly to obtain a plugging agent composition.

[0073] Example 7

[0074] 1) Weigh 100 g of sodium lignin sulfonate, add 1500 g of water, and stir evenly to obtain a sodium lignin sulfonate solution;

[0075] 2) 300 g of styrene maleic anhydride emulsion, 80 g of talc with an average particle size of 400 mesh, 40 g of polyacrylic acid and sodium lignin sulfonate solution were mixed and uniformly mixed at a stirring speed of 500 r / min to obtain a system to be cross-linked;

[0076] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 30 g of diethylenetriamine and 1 g of benzoyl peroxide) are mixed uniformly to obtain a plugging agent composition.

[0077] Example 8

[0078] 1) Weigh 100 g of calcium lignin sulfonate, add 1700 g of water, and stir evenly to obtain a calcium lignin sulfonate solution;

[0079] 2) 330 g of styrene acrylate emulsion, 50 g of magnesium chloride with an average particle size of 2000 mesh, 25 g of polyacrylic acid, and calcium lignin sulfonate solution were mixed and uniformly mixed at a stirring speed of 500 rpm to obtain a system to be cross-linked;

[0080] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 10 g of p-phenylenediamine and 1 g of benzoyl peroxide) are mixed uniformly to obtain a plugging agent composition.

[0081] Example 9

[0082] 1) Weigh 90 g of carboxylated lignin, add 1400 g of water, and stir evenly to obtain a carboxylated lignin solution;

[0083] 2) 150 g of aqueous polyurethane emulsion, 30 g of talc with an average particle size of 400 mesh, 40 g of polyacrylic acid, and the carboxylated lignin solution were mixed and uniformly mixed at a stirring speed of 500 rpm to obtain a system to be cross-linked;

[0084] 3) The system to be cross-linked and the cross-linking agent (specifically, a mixture of 40 g of polyetheramine and 1.5 g of benzoyl peroxide) are mixed uniformly to obtain a plugging agent composition.

[0085] Evaluation of gelling properties of plugging agent compositions

[0086] (1) Preparation of cured elastomer and determination of curing time of plugging agent composition

[0087] The plugging agent compositions prepared in Examples 1 to 9 were respectively prepared into cured elastomers according to the following steps:

[0088] To simulate the formation curing environment, a pressure tube and a hydrothermal reactor were used as reaction vessels. 50 mL of each of the plugging agent compositions prepared in Examples 1 to 9 were weighed and transferred into 100 mL pressure tubes, respectively. After sealing, the tubes were placed in an electric blast drying oven at 170°C for curing. Timing was started. When no liquid form remained and the fluidity was completely lost, curing was considered complete. Cured elastomers 1 to 9 were obtained in sequence. The curing time of the plugging agent compositions prepared in Examples 1 to 9 was recorded. See Table 1 for details.

[0089] Table 1. Curing time of plugging agent composition

[0090] Example Cured elastomer Curing time / h Example 1 Cured elastomer 1 4 Example 2 Cured elastomer 2 3 Example 3 Cured elastomer 3 6 Example 4 Cured elastomer 4 2.5 Example 5 Cured elastomer 5 3.5 Example 6 Cured elastomer 6 3.0 Example 7 Cured elastomer 7 3.0 Example 8 Cured elastomer 8 2.5 Example 9 Cured elastomer 9 3.0

[0091] As can be seen from Table 1, at a high temperature of 170° C., the curing time of the plugging agent composition provided by the present invention can be adjusted within 2.5 to 6 hours, which can meet the requirements for different curing times in actual applications.

[0092] (2) Evaluation of the compressive stress and compression resistance of the elastomer after curing

[0093] The compression resistance of the cured elastomers 1 to 9 obtained by curing the plugging agent compositions prepared in Examples 1 to 9 was evaluated according to the following method:

[0094] 2-1. Using a compression strength meter, first compress the cured elastomers 1, 2, 4, 5, 6, and 7 obtained in (1) to a compression ratio of 85%, compress the cured elastomer 3 to a compression ratio of 70%, compress the cured elastomer 8 to a compression ratio of 75%, and compress the cured elastomer 9 to a compression ratio of 80%. Record the compressive load applied by the compression strength meter when compressing the above-mentioned cured elastomers 1-9 to the above-mentioned compression ratios, and divide it by the initial cross-sectional area of ​​each elastomer to obtain the compressive stress of the cured elastomers 1-9 at the above-mentioned compression ratios. Then remove the compressive load and observe the structural recovery of the cured elastomers 1 to 9.

[0095] It was observed that after curing, the structures of elastomers 1 to 9 were able to completely recover to their pre-compression state after undergoing one compression.

[0096] 2-2. Using a compression strength tester, continue to compress cured elastomers 1 to 9, which have undergone one compression in 2-1, several times continuously at a constant compression ratio, with a time interval of 10 minutes between each compression. Observe the morphological integrity of cured elastomers 1 to 9, and record the compressive load applied by the compression strength tester during the final compression to the aforementioned compressive stress. Divide the load by the initial cross-sectional area of ​​each elastomer to obtain the compressive stress of the final compression experienced by cured elastomers 1 to 9. Calculate the retention rate of the compressive stress of the final compression relative to the compressive stress of the first compression in 2-1. The results are shown in Table 2.

[0097] Table 2. Compressive stress and compression resistance of cured elastomers 1 to 9

[0098]

[0099] As can be seen from Table 2, the cured elastomer obtained by curing the plugging agent composition provided by the present invention has a compression stress retention rate of more than 80% and even more than 90% during 8 to 20 consecutive compressions compared with the first compression, showing good compression resistance.

[0100] 2-3. After the cured elastomer 3 in 2-1 has undergone one compression, it is compressed continuously for 20 times (the interval between each compression is 10 minutes, and the compression ratio during each compression process increases from 0 to 10%, 20%, 30%, 40%, 50%, 60%, 70%, and 80% in sequence). The compressive stress (or compression resistance) corresponding to the different compression ratios during each compression process is recorded, and the change in the compressive stress during each compression process versus the compression ratio is plotted into a graph to obtain Figure 1 .

[0101] from Figure 1 It can be seen intuitively that during the 20 consecutive compressions of the cured elastomer 3 that has undergone one compression, the trend of the compression stress-compression ratio curve in each compression process is roughly the same, indicating that during the 20 consecutive compressions, the cured elastomer 3 maintains structural integrity and stability without structural rupture.

[0102] (3) Evaluation of heat and salt resistance of cured elastomers

[0103] The temperature and salt resistance of the cured elastomers 1 to 9 obtained by curing the plugging agent compositions prepared in Examples 1 to 9 were evaluated according to the following method:

[0104] 3-1. The cured elastomers 1 to 9 obtained in Experimental Evaluation (1) Preparation of Cured Elastomer and Determination of Curing Time of the Plugging Agent Composition were placed in formation water with a salinity of 210,000 mg / L and aged at different temperatures for several days to obtain aged cured elastomers 1 to 9;

[0105] 3-2. Observe the morphology of the aged and cured elastomer 1-9 obtained in 3-1;

[0106] Taking the aged cured elastomer 3 as an example, Figure 2 The morphology of the cured elastomer 3 after 60 days of aging is shown. It can be seen that it still maintains a clustered state without any dispersion or cracking. In addition, the morphology of the cured elastomers 1, 2, 4-9 after several days of aging is similar to that of the elastomers 1, 2, 4-9. Figure 2 Similar to that shown in , there is no dispersion or cracking phenomenon, indicating that the elastomer formed after the plugging composition provided by the present invention is cured can maintain long-term structural integrity and stability in a high temperature and high salt environment.

[0107] 3-3. The volume shrinkage ratio of the aged cured elastomer was measured, the rebound performance of the cured elastomer was observed, and the compressive stress of the cured elastomer was measured at a certain compression ratio using a compression strength tester. The results are shown in Table 3. The volume shrinkage ratio is the percentage of the volume of the aged cured elastomer to the initial volume of the cured elastomer before aging. The rebound performance refers to whether the aged cured elastomer rebounds after being compressed to a certain compression ratio and then the pressure is removed.

[0108] Table 3. Temperature and salt resistance of cured elastomers 1 to 9

[0109]

[0110]

[0111] As can be seen from Table 3, after aging for 45 to 60 days at a temperature of 150 to 200°C and in a formation water environment with a salinity of 210,000 mg / L, the cured elastomer formed by curing the plugging agent composition provided by the present invention has a volume shrinkage ratio of less than 15%, maintains rebound performance, and has a compressive stress of more than 0.9 MPa at a compression ratio of 70% to 85%, indicating good resistance to high temperature and high salt.

[0112] 3-4. The aged and cured elastomer 3 in 3-1 was compressed continuously 20 times (the interval between each compression was 10 minutes, and the compression ratio during each compression process was increased from 0 to 10%, 20%, 30%, 40%, 50%, 60%, 70%, and 80% in sequence). The corresponding compressive stress (or compression resistance) at different compression ratios during each compression process was recorded. The change in compressive stress versus compression ratio during each compression process was plotted as a graph to obtain Figure 3 .

[0113] from Figure 3 It can be seen that during the 20 consecutive compressions of the aged and cured elastomer 3, the trend of the compression stress-compression ratio curve in each compression process is roughly the same, indicating that during the 20 consecutive compressions, the aged and cured elastomer 3 maintains structural integrity and stability without structural rupture. Figure 1 Come and see, Figure 3 and Figure 1 The curve trends in are generally consistent, proving that the cured elastomer 3 still maintains a normal compression process after aging in a high-temperature and high-salt environment.

[0114] In summary, it can be shown that the plugging agent composition provided by the present invention has good gelling properties, its curing time is adjustable, and the cured elastomer formed after curing has strong deformation ability, sufficient compressive stress, and good high temperature and high salt resistance. It can better adapt to the changes of holes and pores in a high temperature and high salt environment. In addition, the plugging agent composition has low cost and a simple preparation process. When used on site, the pre-prepared system to be cross-linked and the cross-linking agent can be mixed evenly before use. The raw materials used are non-toxic and harmless, the operation is simple, and the field adaptability is good. It is suitable for water plugging operations in high temperature and high salt carbonate fracture-cavity oil reservoirs.

[0115] Although the present invention has been described with reference to specific embodiments, those skilled in the art will appreciate that various modifications may be made without departing from the true spirit and scope of the invention. Furthermore, the subject matter, spirit, and scope of the invention may be modified in various ways to adapt to specific circumstances, materials, combinations of materials, and methods. All such modifications are intended to be within the scope of the claims.

Claims

1. A plugging agent composition comprising modified lignin, resin emulsion, filler, stabilizer, cross-linking agent and water.

2. The composition according to claim 1, characterized in that Taking the mass of the plugging agent composition as 100%, the plugging agent composition includes 3.7-6.1 wt% of the modified lignin, 2.3-15 wt% of the resin emulsion, 0.3-5 wt% of the filler, 0.02-2.3 wt% of the stabilizer, 0.3-2.4 wt% of the crosslinking agent and the balance water.

3. The plugging agent composition according to claim 1 or 2, characterized in that: The modified lignin includes carboxylated lignin and / or lignin sulfonate.

4. The plugging agent composition according to claim 3, characterized in that The lignin sulfonate is selected from at least one of sodium lignin sulfonate, calcium lignin sulfonate and iron lignin sulfonate.

5. The plugging agent composition according to any one of claims 1 to 4, characterized in that The resin emulsion includes at least one of styrene maleic anhydride emulsion, styrene acrylate emulsion, polyacrylate emulsion and aqueous polyurethane emulsion.

6. The plugging agent composition according to any one of claims 1 to 5, characterized in that The filler is selected from at least one of calcium carbonate, talc, kaolin, bentonite and magnesium chloride.

7. The plugging agent composition according to any one of claims 1 to 6, characterized in that: The average particle size of the filler is 400-2000 meshes.

8. The plugging agent composition according to any one of claims 1 to 7, characterized in that The stabilizer is selected from at least one of polycarboxylic acid, polyethylene oxide and polyacrylic acid.

9. The plugging agent composition according to any one of claims 1 to 8, characterized in that The cross-linking agent is selected from at least one of ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, zinc oxide, magnesium chloride, triethylenetetramine, diethylenetriamine, methylcyclohexanediamine, p-phenylenediamine, polyetheramine and benzoyl peroxide.

10. Use of the plugging agent composition according to any one of claims 1 to 9 in water plugging in high-temperature and high-salinity oil reservoirs; Preferably, the high temperature is 150-220° C.; and / or the high salt has a mineralization not higher than 210,000 mg / L.

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