An oil film separation polymeric gel particle water plugging profile control agent and a synthesis process thereof

Abstract

This invention discloses a polymeric gel particle water-blocking and profile control agent for oil film separation and its synthesis process, relating to the field of oilfield profile control agents. The water-blocking and profile control agent comprises 30-40 parts of reactive monomers, 8-12 parts of epoxy-terminated phenyltrisiloxane, 0.5-1.5 parts of filler, 0.2-0.5 parts of initiator, 3-6 parts of crosslinking agent, 0.08-0.12 parts of chain transfer agent, 0.5-1.0 parts of emulsifier, and 100 parts of solvent. The reactive monomers include acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone, with a weight ratio of 1:(2-6):(2-4):(1-3). This water-blocking and profile control agent exhibits rapid water absorption and swelling efficiency even in environments below 10°C, and demonstrates good plugging performance, which is beneficial for improving oil production efficiency.

Description

Technical Field

[0001] This invention relates to the field of oilfield profile control agents, and in particular to a polymeric gel particle profile control agent for oil film separation and its synthesis process. Background Technology

[0002] Whether it's water shut-off or profile control, high-strength plugging agents are the main components, and their mechanism of action is mostly physical barrier-type plugging. The purpose is to adjust the water absorption profile and production profile near the bottom of the well, which is an effective means for oilfields to improve the water injection development effect and achieve stable reservoir production.

[0003] Based on their state in the formation, water shut-off and profile control agents can be broadly classified into gel, gel, resin, sediment, and dispersion types, suitable for different reservoir characteristics and technological requirements. Gel types mainly include silica gel, aluminate gel, ferric hydroxide gel, and cyanide gel; gel types mainly include aluminum gel, titanium gel, chromium lignin gel, silica gel, and phenolic resin gel; resin types mainly include phenolic resin, urea-formaldehyde resin, epoxy resin, and furfuryl alcohol resin; sediment types mainly include water glass, sodium rosinate, sodium fatty acid, and sodium naphthenate; and dispersion types mainly include bulked particles, flexible particles, cement, bentonite, emulsified heavy oil, foam, and activated sludge.

[0004] Among them, high-molecular-weight polyacrylamide is the most widely used water shut-off and profile control agent. However, current high-molecular-weight polyacrylamide technologies generally suffer from low water absorption and swelling efficiency, especially in environments with temperatures below 10°C, where the water absorption and swelling efficiency is even lower. Furthermore, the plugging performance of water shut-off and profile control agents directly affects oil recovery rates. Therefore, obtaining a water shut-off and profile control agent with high water absorption and swelling efficiency and good plugging performance under low-temperature conditions is currently a key research focus. Summary of the Invention

[0005] In order to improve the water absorption and expansion efficiency and sealing performance of water-blocking and profile control agents in related technologies under low temperature conditions, this application provides a polymeric gel particle water-blocking and profile control agent for oil film separation and its synthesis process.

[0006] This application provides a polymeric gel particle water-blocking and profile control agent for oil film separation, which adopts the following technical solution:

[0007] A polymeric gel particle profile control agent for oil film separation comprises the following raw materials in parts by weight:

[0008] Reaction monomer: 30-40 parts

[0009] Epoxy-terminated phenyltrisiloxanes: 8-12 parts

[0010] Filler: 0.5-1.5 parts

[0011] Initiator: 0.2-0.5 parts

[0012] Crosslinking agent: 3-6 parts

[0013] Chain transfer agent: 0.08-0.12 parts

[0014] Emulsifier: 0.5-1.0 parts

[0015] Solvent: 100 parts

[0016] The reaction monomers include acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone, wherein the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:(2-6):(2-4):(1-3).

[0017] A water-blocking and profile control agent polymerized from acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, N-vinyl-2-pyrrolidone, and epoxy-terminated phenyltrisiloxane in a specific ratio can rapidly absorb water and expand to form a "plug wall" in a low-temperature environment of 6-10℃. This improves the low efficiency of water-blocking and profile control agents in forming a "plug wall" in low-temperature environments, thus promoting oil displacement efficiency in such environments. Furthermore, this water-blocking and profile control agent also exhibits good plugging properties, further enhancing oil production efficiency.

[0018] Optionally, the weight ratio of the acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone is 1:(3-5):(2-4):(1-3).

[0019] When the ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is within the above range, the water-blocking and profile control agent can be further improved in terms of water absorption and swelling efficiency under low temperature conditions, while also increasing the gel strength, which promotes the sealing rate of the "wall-blocking" process.

[0020] Optionally, the weight ratio of the acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:4:3:2.

[0021] When the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:4:3:2, the water absorption and expansion efficiency and the plugging efficiency of the profile control agent under low temperature conditions can be further improved.

[0022] Optionally, the filler may be selected from any one or a combination of almond shells, walnut shells, and coconut coir.

[0023] The filler material selected is a material with good water permeability, such as almond shells, walnut shells, and coconut coir, which promotes the water absorption and expansion efficiency of the water-blocking and profile control agent under low temperature conditions.

[0024] Optionally, the particle size range of the filler is 20-50 μm.

[0025] Optionally, the filler is a polyvinyl alcohol-coated modified filler.

[0026] The filler is modified with polyvinyl alcohol coating, which helps reduce the probability of pore blockage and promotes the water absorption and expansion efficiency of the water-blocking and profile control agent under low temperature conditions.

[0027] Optionally, the preparation method of the polyvinyl alcohol coated modified filler includes the following steps:

[0028] The filler was soaked in N-methyl-N-hydroxyethyl-p-toluidine and then naturally dried to obtain the pre-modified filler; wherein the weight ratio of the filler to N-methyl-N-hydroxyethyl-p-toluidine was 1:(8-12);

[0029] The pre-modified filler was added to a polyvinyl alcohol solution, stirred evenly, and the solid was separated and dried to obtain the polyvinyl alcohol-coated modified filler.

[0030] The weight ratio of the pre-modified filler to the polyvinyl alcohol solution is 1:(4-8).

[0031] First, N-methyl-N-hydroxyethyl p-toluidine is used to pre-modify the filler, and then polyvinyl alcohol is used to coat the pre-modified filler. This not only promotes the water absorption and expansion efficiency of the water-blocking profile control agent under low temperature conditions, but also further improves the gel strength, which further promotes the sealing rate of the "wall-blocking" process.

[0032] The viscosity range of the polyvinyl alcohol aqueous solution is preferably 40-60 cst, which can form a coating layer on the filler surface and prevent the polyvinyl alcohol aqueous solution from seeping into the pores of the walnut shell and causing blockage.

[0033] Optionally, the crosslinking agent includes N,N-methylenebisacrylamide and tetraallyl ammonium chloride, wherein the weight ratio of N,N-methylenebisacrylamide to tetraallyl ammonium chloride is (3-4):1.

[0034] The crosslinking agent is a combination of N,N-methylenebisacrylamide and tetraallyl ammonium chloride in a specific ratio, which is beneficial to further improve the gel strength and has a further promoting effect on improving the sealing rate of the "wall".

[0035] Optionally, the chain transfer agent is selected from any one or a combination of several of C1-C4 lower fatty alcohols, alkyl sulfonates, and alkyl allyl sulfonates.

[0036] Optionally, the initiator is selected from at least one of water-soluble azo initiators and persulfate initiators.

[0037] Among them, the water-soluble azo initiator is selected from at least one of azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, azobisisobutylammonium valerate, and azobisisopropylimidazoline.

[0038] The persulfate initiator is selected from at least one of ammonium persulfate, sodium persulfate, and potassium persulfate.

[0039] Secondly, the synthesis process of the polymeric gel particle water-blocking and profile control agent for oil film separation provided in this application adopts the following technical solution:

[0040] Acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone were added to 60-70% of the total mass of the solvent according to the specified ratio, and stirred evenly to obtain a mixed solution of the reaction monomers.

[0041] Add the emulsifier to 10-20% of the total mass of the solvent and stir until homogeneous to obtain an emulsifier solution;

[0042] Add the initiator to the remaining solvent and stir until homogeneous to obtain an initiator solution;

[0043] Epoxy-terminated phenyltrisiloxane and emulsifier solution were added to the monomer mixture solution and stirred until homogeneous. Then, crosslinking agent and chain transfer agent were added and stirred until homogeneous. Under nitrogen protection, initiator solution was added dropwise. The reaction system temperature was controlled at 60-70℃ and the reaction was carried out for 4-5 hours. After drying and pulverizing, polymerized gel particles were obtained as a water-blocking and profile-modifying agent.

[0044] The additives prepared by the above method can effectively reduce the residual amount of monomers and improve the safety of the reaction, reducing the phenomenon of rapid polymerization.

[0045] In summary, this application includes at least the following beneficial effects:

[0046] (1) The water-blocking and profile control agent obtained by polymerizing acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, N-vinyl-2-pyrrolidone, and epoxy-terminated phenyltrisiloxane in the above specific ratio can still achieve rapid water absorption and expansion to form a "plug wall" in a low-temperature environment of 6-10℃. This helps to improve the low efficiency of water-blocking and profile control agents in forming a "plug wall" in low-temperature environments, and promotes the improvement of oil displacement efficiency in low-temperature environments. In addition, this water-blocking and profile control agent also has good sealing performance, which promotes the improvement of oil production efficiency.

[0047] (2) First, N-methyl-N-hydroxyethyl p-toluidine is used to pre-modify the filler, and then polyvinyl alcohol is used to coat the pre-modified filler. This not only promotes the water absorption and expansion efficiency of the water-blocking profile control agent under low temperature conditions, but also further improves the gel strength, which further promotes the sealing rate of the "wall". Detailed Implementation

[0048] The following section provides a more detailed explanation of this application in conjunction with experiments.

[0049] Example

[0050]

Example 1

[0051] A polymeric gel particle profile control agent for oil film separation comprises the following raw materials:

[0052] Reaction monomers: 30 kg, including acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone, with a weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone of 1:2:4:3;

[0053] Epoxy-terminated phenyltrisiloxane: 8 kg, viscosity 45 cst;

[0054] Filler: 0.5kg, specifically walnut shells with a particle size of 20-30μm;

[0055] Initiator: 0.2 kg, potassium persulfate is preferred;

[0056] Crosslinking agent: 3 kg, comprising N,N-methylenebisacrylamide and tetraallyl ammonium chloride, with a weight ratio of N,N-methylenebisacrylamide to tetraallyl ammonium chloride of 3:1;

[0057] Chain transfer agent: 0.08 kg, specifically sodium methyl allyl sulfonate;

[0058] Emulsifier: 0.5 kg, specifically sodium fatty alcohol polyoxyethylene ether sulfate;

[0059] Solvent: 100kg, specifically water.

[0060] The synthesis process of the above-mentioned polymeric gel particle water-blocking and profile control agent for oil film separation includes the following steps:

[0061] Acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone were added to 70 kg of water according to the specified ratio and stirred until homogeneous to obtain a mixed solution of the reaction monomers.

[0062] Add the emulsifier to 15 kg of water and stir until homogeneous to obtain an emulsifier solution;

[0063] Add the initiator to 15 kg and stir until homogeneous to obtain the initiator solution;

[0064] Epoxy-terminated phenyltrisiloxane and emulsifier solution were added to the monomer mixture solution and stirred until homogeneous. Then, crosslinking agent and chain transfer agent were added and stirred until homogeneous. Under nitrogen protection, initiator solution was added dropwise, and the reaction system temperature was controlled at 70℃. The reaction was carried out for 4 hours, followed by drying and pulverization to obtain polymeric gel particle water-blocking and profile control agent.

[0065]

Example 2

[0066] A polymeric gel particle profile control agent for oil film separation comprises the following raw materials:

[0067] Reaction monomers: 35 kg, including acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone, with a weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone of 1:2:4:3;

[0068] Epoxy-terminated phenyltrisiloxane: 10 kg, viscosity 45 cst;

[0069] Filler: 1 kg, specifically walnut shells with a particle size of 20-30 μm;

[0070] Initiator: 0.35 kg, potassium persulfate is preferred;

[0071] Crosslinking agent: 4.5 kg, comprising N,N-methylenebisacrylamide and tetraallyl ammonium chloride, with a weight ratio of N,N-methylenebisacrylamide to tetraallyl ammonium chloride of 3:1;

[0072] Chain transfer agent: 0.1 kg, specifically sodium methyl allyl sulfonate;

[0073] Emulsifier: 0.75 kg, specifically sodium fatty alcohol polyoxyethylene ether sulfate;

[0074] Solvent: 100kg, specifically water.

[0075] The preparation method of the polymeric gel particle water-blocking and profile control agent for oil film separation in this embodiment is the same as that in [Example 1].

[0076]

Example 3

[0077] A polymeric gel particle profile control agent for oil film separation comprises the following raw materials:

[0078] Reaction monomers: 40 kg, including acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone, with a weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone of 1:2:4:3;

[0079] Epoxy-terminated phenyltrisiloxane: 12 kg, viscosity 45 cst;

[0080] Filler: 1.5kg, specifically walnut shells with a particle size of 20-30μm;

[0081] Initiator: 0.5 kg, potassium persulfate is preferred;

[0082] Crosslinking agent: 6 kg, comprising N,N-methylenebisacrylamide and tetraallyl ammonium chloride, with a weight ratio of N,N-methylenebisacrylamide to tetraallyl ammonium chloride of 3:1;

[0083] Chain transfer agent: 0.12 kg, specifically sodium methyl allyl sulfonate;

[0084] Emulsifier: 1.0 kg, specifically sodium fatty alcohol polyoxyethylene ether sulfate;

[0085] Solvent: 100kg, specifically water.

[0086] The preparation method of the polymeric gel particle water-blocking and profile control agent for oil film separation in this embodiment is the same as that in [Example 1].

[0087]

Example 4

[0088] A polymeric gel particle water-blocking and profile control agent for oil film separation differs from [Example 2] in that the composition of the reactive monomers is different.

[0089] In this embodiment, the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:3:4:2;

[0090]

Example 5

[0091] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0092] The compositions of the reactants are different.

[0093] In this embodiment, the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:4:3:2.

[0094]

Example 6

[0095] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0096] The compositions of the reactants are different.

[0097] In this embodiment, the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:5:2:2.

[0098]

Example 7

[0099] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0100] The compositions of the reactants are different.

[0101] In this embodiment, the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:6:2:1.

[0102]

Example 8

[0103] A polymeric gel particle profile control agent for oil film separation differs from [Example 5] in that:

[0104] The fillers are different.

[0105] In this embodiment, the filler used is polyvinyl alcohol-coated modified walnut shell. The preparation method of the polyvinyl alcohol-coated modified filler is as follows:

[0106] The filler was added to a polyvinyl alcohol solution with a viscosity of 42 cSt, stirred until homogeneous, the solid was separated and dried naturally to obtain the polyvinyl alcohol-coated modified filler.

[0107]

Example 9

[0108] A polymeric gel particle profile control agent for oil film separation differs from [Example 5] in that:

[0109] The fillers are different.

[0110] In this embodiment, the filler used is polyvinyl alcohol-coated modified walnut shell. The preparation method of the polyvinyl alcohol-coated modified filler is as follows:

[0111] The filler was soaked in N-methyl-N-hydroxyethyl-p-toluidine and then naturally dried to obtain the pre-modified filler; wherein the weight ratio of the filler to N-methyl-N-hydroxyethyl-p-toluidine was 1:10.

[0112] The pre-modified filler was added to a polyvinyl alcohol solution with a viscosity of 42 cst, stirred evenly, the solid was separated and dried naturally to obtain a polyvinyl alcohol-coated modified filler; wherein the weight ratio of the pre-modified filler to the polyvinyl alcohol solution with a viscosity of 42 cst was 1:5.

[0113] Comparative Example

[0114] Comparative Example 1

[0115] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0116] The reactants are different.

[0117] In this comparative example, the reaction monomers include acrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone, with a weight ratio of 3:4:3.

[0118] Comparative Example 2

[0119] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0120] The reactants are different.

[0121] In this comparative example, the reaction monomers include acrylamide, N-hydroxyacrylamide, and N-vinyl-2-pyrrolidone, with a weight ratio of 5:2:3.

[0122] Comparative Example 3

[0123] A polymeric gel particle profile control agent for oil film separation differs from [Example 2] in that:

[0124] No filler was added.

[0125] Performance testing

[0126] Weight change rate before and after water absorption: 10g of the water-blocking and profile control agent from Examples 1-9 and Comparative Examples 1-3 were weighed into a sieve, and then immersed in water at 6℃ and 25℃ respectively. After standing for 30 minutes, the sieve was removed and left to stand in an environment at 25℃ for 30 minutes. The weight of the water-blocking and profile control agent after water absorption was then weighed, and the weight change rate was recorded in Table 1 below. The weight change rate is calculated as: (weight of water-blocking and profile control agent after water absorption - 10) / 10 * 100. A higher weight change rate indicates a higher water absorption and expansion efficiency of the water-blocking and profile control agent.

[0127] Plugging rate: The colloidal product was dissolved in mineralized water with a mineralization of 20000 mg / L at a mass ratio of 8:1. The solution was then injected into a core sample (90% 200-300 mesh quartz sand and 10% epoxy resin) under a pressure of 9.71 MPa. The sample was cured at 6°C for 48 hours. Permeability before and after plugging was then tested and recorded. The plugging rate is calculated as: (Permeability before plugging - Permeability after plugging) / Permeability before plugging * 100%. A higher plugging rate indicates better plugging performance of the water-blocking and profile control agent, and a higher breakthrough pressure indicates greater gel strength of the agent.

[0128] Table 1

[0129]

[0130] Based on the data from Example 2 and Comparative Examples 1-2, and in Table 1, it can be seen that when N-hydroxyacrylamide or dimethylaminopropylmethacrylamide is replaced by an equal amount of acrylamide, the water absorption expansion rate and plugging rate of the profile plugging agent under low temperature conditions are reduced, which is not conducive to improving the rapid formation of a "plug wall" by the profile plugging agent under low temperature conditions, and the plug wall formed has poor sealing performance.

[0131] Based on the data in Example 2 and Comparative Example 3, and in conjunction with the data in Table 1, it can be seen that when no filler is added, the water absorption and expansion rate of the profile control agent is reduced under low temperature conditions. This may be because the lack of a filler with good permeability makes it difficult for water to enter the interior of the profile control agent.

[0132] Based on Examples 2 and 4-7 and the data in Table 1, it can be seen that when the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is in the range of 1:(3-5):(2-4):(1-3), the water-blocking and profile control agent's water absorption and swelling efficiency and plugging rate under low-temperature conditions can be further improved. This is because when the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is within the above range, the gelling strength of the water-blocking and profile control agent increases. The preferred weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:4:3:2.

[0133] Combining Examples 6 and 8-9 with the data in Table 1, it can be seen that using polyvinyl alcohol (PVA) to coat modified walnut shells as filler can further improve the water absorption and expansion efficiency of the water-blocking and profile-modifying agent under low-temperature conditions. This is likely because PVA coating helps reduce the probability of pore blockage in the filler, thereby increasing the rate at which water penetrates into the water-blocking and profile-modifying agent. Furthermore, pre-modifying the walnut shells with N-methyl-N-hydroxyethyl-p-toluidine followed by PVA coating not only promotes the improvement of the water absorption and expansion efficiency of the water-blocking and profile-modifying agent under low-temperature conditions but also further enhances the gel strength, further promoting the sealing rate of the "wall-blocking" process.

[0134] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A polymeric gel particle profile control agent for oil film separation, characterized in that: Including the following parts by weight of raw materials: Reaction monomer: 30-40 parts; Epoxy-terminated phenyltrisiloxanes: 8-12 parts; Polyvinyl alcohol coated modified filler: 0.5-1.5 parts; Initiator: 0.2-0.5 parts; Crosslinking agent: 3-6 parts; Chain transfer agent: 0.08-0.12 parts Emulsifier: 0.5-1.0 parts; Solvent: 100 parts; The reactant monomers include acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone, wherein the weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:(2-6):(2-4):(1-3). The preparation method of the polyvinyl alcohol coated modified filler includes the following steps: The filler was soaked in N-methyl-N-hydroxyethyl-p-toluidine and then naturally dried to obtain the pre-modified filler. The pre-modified filler is added to a polyvinyl alcohol solution, stirred evenly, the solid is separated and dried to obtain a polyvinyl alcohol coated and modified filler; wherein the filler is selected from any one or a combination of almond shells, walnut shells and coconut coir, and the particle size range of the filler is 20-50μm. The crosslinking agent comprises N,N-methylenebisacrylamide and tetraallyl ammonium chloride, wherein the weight ratio of N,N-methylenebisacrylamide to tetraallyl ammonium chloride is (3-4):

1.

2. The polymeric gel particle water-blocking and profile control agent for oil film separation according to claim 1, characterized in that: The weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide and N-vinyl-2-pyrrolidone is 1:(3-5):(2-4):(1-3).

3. The polymeric gel particle water-blocking and profile control agent for oil film separation according to claim 1, characterized in that: The weight ratio of acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone is 1:4:3:

2.

4. The polymeric gel particle water-blocking and profile control agent for oil film separation according to claim 1, characterized in that: The chain transfer agent is selected from any one or a combination of several of C1-C4 lower fatty alcohols, alkyl sulfonates, and alkyl allyl sulfonates.

5. The synthesis process of the polymeric gel particle water-blocking and profile control agent for oil film separation according to any one of claims 1-4, characterized in that: Includes the following steps: Acrylamide, N-hydroxyacrylamide, dimethylaminopropylmethacrylamide, and N-vinyl-2-pyrrolidone were added to 60-70% of the total mass of the solvent according to the specified ratio, and stirred evenly to obtain a mixed solution of the reaction monomers. Add the emulsifier to 10-20% of the total mass of the solvent and stir until homogeneous to obtain an emulsifier solution; Add the initiator to the remaining solvent and stir until homogeneous to obtain an initiator solution; Epoxy-terminated phenyltrisiloxane and emulsifier solution were added to the monomer mixture solution and stirred until homogeneous. Then, crosslinking agent and chain transfer agent were added and stirred until homogeneous. Under nitrogen protection, initiator solution was added dropwise. The reaction system temperature was controlled at 60-70℃ and the reaction was carried out for 4-5 hours. After drying and pulverizing, polymerized gel particles were obtained as a water-blocking and profile-modifying agent.

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