CN109384890B - Polymer with selective water plugging function and preparation method and application thereof - Google Patents

Polymer with selective water plugging function and preparation method and application thereof Download PDF

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CN109384890B
CN109384890B CN201710652572.1A CN201710652572A CN109384890B CN 109384890 B CN109384890 B CN 109384890B CN 201710652572 A CN201710652572 A CN 201710652572A CN 109384890 B CN109384890 B CN 109384890B
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oil
monomer
weight
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CN109384890A (en
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赵方园
杨捷
王晓春
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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China Petroleum and Chemical Corp
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
    • C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
    • C08F2/30—Emulsion polymerisation with the aid of emulsifying agents non-ionic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

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Abstract

The invention relates to the research field of profile control and water shutoff materials of oil fields and the improvement of the oil well productivity of oil reservoirs in high water-cut periods, and discloses a polymer with a selective water shutoff function, which is prepared by carrying out a polymerization reaction on an emulsion containing a monomer A, a monomer B, an oil-soluble resin and an emulsifier in the presence of an initiator, a chain transfer agent and water as a solvent, wherein the monomer A is acrylamide; the monomer B is a sulfonic acid monomer, and the sulfonic acid monomer is 2-acrylamide-2-methylpropanesulfonic acid; the oil-soluble resin is one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier comprises a primary emulsifier and/or a co-emulsifier. The polymer prepared by the invention has excellent effects of selectively blocking water but not oil, and has higher scouring resistance times.

Description

Polymer with selective water plugging function and preparation method and application thereof
Technical Field
The invention relates to the research field of oil field profile control water shutoff materials and improvement of oil well production of oil reservoirs in high water cut periods, in particular to a polymer with a selective water shutoff function, a method for preparing the polymer with the selective water shutoff function, the polymer with the selective water shutoff function prepared by the method, and application of the polymer with the selective water shutoff function as a selective water shutoff agent.
Background
The water plugging process for the oil well is a key technology for optimizing the development result of water injection of the oil and gas field. The water layer and the oil layer in the stratum are mutually interwoven, the heterogeneity is serious, the two reservoirs are difficult to be effectively isolated by the existing construction technology, but oil field enterprises need to stabilize the yield of crude oil and reduce the comprehensive water content of an oil well as far as possible, and therefore higher requirements are provided for the water shutoff agent with high oil/water selectivity. Although the existing water-based, oil-based and polymer gel water-blocking systems have certain selectivity, the water-blocking and oil-blocking systems block water and oil, and indoor physical model experiment results show that the oil-blocking rate of the existing water-blocking agents is more than 35%, the temperature resistance and salt resistance of the systems are poor, and the popularization and application range is small. Although the water-soluble polymer water shutoff agent can preferentially enter a stratum with higher water saturation, part of the water-soluble polymer water shutoff agent can enter an oil layer in stratum migration, and the water-soluble polymer water shutoff agent is very difficult to discharge because the water shutoff agent has no self-plugging removal capability. Although the oil-based cement water shutoff agent can also improve the crude oil recovery efficiency to a greater extent, the oil-based cement water shutoff agent has the great disadvantage that a stratum with higher water saturation is generally plugged, and when the oil-based cement water shutoff agent flows into an oil-water mixed stratum, even if only a small part of stratum water is mixed in an oil layer, the oil-based cement water shutoff agent can react with the stratum water to solidify the cement, which shows that the water shutoff selectivity of the oil-based cement water shutoff agent is also greatly deficient. The polymer gel water shutoff agent enables the oil-water phase permeability to be reduced unevenly by means of the change of the effective movable volume under the action of oil and water, but the oil-water channel physical shutoff can be caused by the treatment mode, so that the seepage capability of a porous medium is reduced, the oil production capability is also reduced while the water production of an oil well is greatly reduced, the liquid production amount is too low due to improper treatment, and the yield of crude oil is reduced.
At present, selective water shutoff agents and deep profile control technologies at home and abroad are improved day by day, and the selective water shutoff materials are developed greatly on the technologies of research development, construction process and the like, but along with the development of oil fields, the characteristics of oil layers and the environment are changed constantly, particularly, the water shutoff materials are adopted for a long time to make the contradiction of oil reservoir development more prominent in the later development period, the practical development experience of the oil fields is summarized according to the characteristics of the selective water shutoff materials, and the technical problem which must be overcome at present by the selective water shutoff agents is provided so as to develop new technologies in a targeted manner to adapt to the special oil fields and improve the water shutoff effect of a selective system.
In summary, most of the selective plugging agents used for water plugging of oil wells at present are gels or jelly generated by water-soluble polymers such as polyacrylamide and derivatives thereof in the stratum to plug the stratum water, or oil-based plugging agents are used for gelling or curing when meeting water to plug water channeling passages, but due to poor selectivity, the oil phase permeability can be greatly reduced while water plugging is carried out, so that low liquid after plugging is caused, and the application of the water plugging technology of the oil wells is restricted.
Therefore, a novel high-selectivity water plugging material is developed, so that water plugging and oil plugging of an oil layer are realized, and the method has important significance for improving the productivity of an oil well in an ultrahigh water cut period.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a polymer with a selective water plugging function, a preparation method and application thereof, namely, adding a certain amount of acrylamide monomer, sulfonic acid monomer, oil-soluble resin particles and emulsifier into an aqueous solution, stirring to form a stable emulsion system, adding an initiator and a chain transfer agent, polymerizing to obtain a polymer colloid containing the resin particles, and granulating, drying and crushing the colloid to obtain a powder type water plugging material. According to the water plugging material with high selectivity, water plugging agents with different mass concentrations can be prepared by adopting field water according to the field requirements of an oil field, and the water plugging agents are injected into an oil reservoir stratum and enter a water phase layer, so that oil-soluble particles in the water plugging material can effectively plug pore passages, further the water phase permeability is reduced, and the water phase plugging effect is enhanced; after entering the oil phase layer, the oil-soluble particles are dissolved in the crude oil without affecting the oil phase permeability, thereby achieving the effect of selectively blocking water and not blocking oil.
In order to achieve the above object, a first aspect of the present invention provides a polymer having a selective water shutoff function, wherein the polymer is obtained by an emulsion polymerization reaction of a monomer a, a monomer B, an oil-soluble resin, and an emulsifier in the presence of an initiator, a chain transfer agent, and water as a solvent, wherein the monomer a is acrylamide; the monomer B is a sulfonic acid monomer, and the sulfonic acid monomer is 2-acrylamide-2-methylpropanesulfonic acid; the oil-soluble resin is one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier comprises a primary emulsifier and/or a co-emulsifier.
Preferably, the amount of the monomer A is 0.9-20 parts by weight, the amount of the monomer B is 0.1-5 parts by weight, the amount of the oil-soluble resin is 20-40 parts by weight, the amount of the main emulsifier is 4.5-9.5 parts by weight, and the amount of the co-emulsifier is 0.5-5.5 parts by weight based on 100 parts by weight of water;
preferably, based on 100 parts by weight of water, the amount of the monomer A is 9-20 parts by weight, the amount of the monomer B is 1-5 parts by weight, the amount of the oil-soluble resin is 30-40 parts by weight, the amount of the main emulsifier is 5-7 parts by weight, and the amount of the co-emulsifier is 2-5 parts by weight;
preferably, the polymer has a wash-out resistance factor of greater than 50 PV.
Preferably, the main emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; preferably, the primary emulsifier is selected from sodium dodecyl sulfonate and/or sodium dodecyl benzene sulfonate;
the auxiliary emulsifier is selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80; preferably, the co-emulsifier is selected from one or more of span 20, span 60 and tween 80.
Preferably, the initiator is a water-soluble initiator which is a persulfate-sulfite oxidation-reduction initiation system; the chain transfer agent is a tetramethylethylenediamine aqueous solution;
preferably, the persulfate is used in an amount of 0.01 to 0.1 wt% and the sulfite is used in an amount of 0.005 to 0.05 wt%, based on the total amount of the monomer A and the monomer B; and
the chain transfer agent is used in an amount of 0.01 to 0.1% by weight.
The invention provides a preparation method of a polymer with selective water plugging function, wherein the preparation method comprises the following steps:
(1) mixing a monomer A, a monomer B and water to form an aqueous solution;
(2) mixing an oil-soluble resin and an emulsifier with the aqueous solution to form an emulsion;
(3) carrying out polymerization reaction on the emulsion in the presence of an initiator and a chain transfer agent;
wherein the monomer A is acrylamide; the monomer B is a sulfonic acid monomer, and the sulfonic acid monomer is 2-acrylamide-2-methylpropanesulfonic acid; the oil-soluble resin is one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier is a main emulsifier and/or a co-emulsifier.
In the present invention, the source of the oil-soluble resin is not particularly limited, and for example, it can be obtained by a conventional commercially available means. In a preferable case, the particle size of the oil-soluble resin is 3 to 100 μm, preferably 3 to 50 μm, for the purpose of more preferably achieving selective water shutoff.
Preferably, the amount of the monomer A is 0.9-20 parts by weight, the amount of the monomer B is 0.1-5 parts by weight, the amount of the oil-soluble resin is 20-40 parts by weight, the amount of the main emulsifier is 4.5-9.5 parts by weight, and the amount of the co-emulsifier is 0.5-5.5 parts by weight based on 100 parts by weight of water; preferably, based on 100 parts by weight of water, the amount of the monomer A is 9-20 parts by weight, the amount of the monomer B is 1-5 parts by weight, the amount of the oil-soluble resin is 30-40 parts by weight, the amount of the main emulsifier is 5-7 parts by weight, and the amount of the co-emulsifier is 2-5 parts by weight; preferably, the polymers produced have a wash-out factor of greater than 50 PV.
Preferably, the main emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; preferably, the primary emulsifier is selected from sodium dodecyl sulfonate and/or sodium dodecyl benzene sulfonate;
the auxiliary emulsifier is selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80; preferably, the co-emulsifier is selected from one or more of span 20, span 60 and tween 80.
Preferably, the initiator is a water-soluble initiator which is a persulfate-sulfite oxidation-reduction initiation system; the chain transfer agent is a tetramethylethylenediamine aqueous solution;
preferably, the persulfate is used in an amount of 0.01 to 0.1 wt% and the sulfite is used in an amount of 0.005 to 0.05 wt%, based on the total amount of the monomer A and the monomer B; and
the chain transfer agent is used in an amount of 0.01 to 0.1% by weight.
Preferably, in step (1), the pH value of the aqueous solution is 6-10; and in the step (3), the conditions of the polymerization reaction are as follows: the temperature is 20-40 deg.C, preferably 25-35 deg.C, and the time is 6-8 hr, preferably 7-8 hr.
The third aspect of the invention provides the polymer with the selective water plugging function prepared by the method.
The fourth aspect of the invention provides an application of the polymer with the selective water plugging function as a selective water plugging agent.
The invention introduces an oil-soluble polymer particle into the emulsion of the water-based acrylamide copolymer, and in the polymerization process, under the action of a chain transfer agent, the oil-soluble polymer particle can perform chain transfer to the surface of a resin particle to form a suspended particle taking the resin particle as a core, and the resin particle can be stably suspended in the water-based emulsion and can be smoothly injected into an oil reservoir stratum through a high-pressure pump. The existence of the oil-soluble particles can greatly improve the temperature resistance, salt resistance and scouring resistance of the water plugging agent material. In the stratum, when the water shutoff agent is influenced by the environmental temperature and the pressure of a water layer, the water shutoff agent can deform, and a large amount of gathered oil-soluble particle water shutoff agents interact with each other to effectively block the stratum with the rock pore with higher water saturation, so that the water yield of an oil well is greatly reduced. After part of the oil-soluble particle water plugging agent flows into an oil layer, the oil-soluble particle water plugging agent can be dissolved into crude oil due to good oil solubility of the oil-soluble particle water plugging agent and is discharged back to the ground together with underground crude oil, so that the oil/water selectivity of a water plugging material is obviously improved, the effect of plugging water and not plugging oil is achieved, measures are provided for the low-efficiency well exploitation and benefit increase under the low oil price, and technical support is provided for the improvement of the oil well productivity in the extremely high water-containing period.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a polymer with selective water plugging function, wherein the polymer is prepared by carrying out emulsion polymerization reaction on a monomer A, a monomer B, an oil-soluble resin and an emulsifier in the presence of an initiator, a chain transfer agent and water as a solvent, wherein the monomer A is acrylamide; the monomer B is a sulfonic acid monomer, and the sulfonic acid monomer is 2-acrylamide-2-methylpropanesulfonic acid; the oil-soluble resin is one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier comprises a primary emulsifier and/or a co-emulsifier.
Preferably, the oil-soluble resin may be one or more of an oil-soluble phenolic resin, a petroleum resin and a coumarone resin.
In the present invention, the monomer a, the monomer B, and the oil-soluble resin may be obtained commercially or synthesized by a method of the prior art. For example, the monomer a, the monomer B, and the oil-soluble resin used in the examples section of the present invention are all commercially available.
According to the invention, based on 100 parts by weight of water, the monomer A is used in an amount of 0.9-20 parts by weight, the monomer B is used in an amount of 0.1-5 parts by weight, the oil-soluble resin is used in an amount of 20-40 parts by weight, the main emulsifier is used in an amount of 4.5-9.5 parts by weight, and the co-emulsifier is used in an amount of 0.5-5.5 parts by weight; in the present invention, the specific selection and amount of the monomer a, the monomer B, the oil-soluble resin, the main emulsifier and the co-emulsifier are controlled within the above range, but it is preferable that the monomer a is used in an amount of 9 to 20 parts by weight, the monomer B is used in an amount of 1 to 5 parts by weight, the oil-soluble resin is used in an amount of 30 to 40 parts by weight, the main emulsifier is used in an amount of 5 to 7 parts by weight, and the co-emulsifier is used in an amount of 2 to 5 parts by weight, based on 100 parts by weight of water.
Further preferably, the total amount of the monomer A and the monomer B is 10 to 25% by weight based on 100 parts by weight of water.
Further preferably, the emulsifier is a main emulsifier and a co-emulsifier, and the total amount of the main emulsifier and the co-emulsifier is 5-10 parts by weight based on 100 parts by weight of water.
Preferably, the polymer has a wash-out resistance factor of greater than 50 PV.
According to the present invention, the primary emulsifier may be selected from one or more of sodium dodecyl sulfate (SBS), Sodium Dodecyl Sulfate (SDS), and Sodium Dodecyl Benzene Sulfonate (SDBS); preferably, the primary emulsifier is selected from one or more of sodium dodecyl sulfate (SBS) and/or Sodium Dodecyl Benzene Sulfonate (SDBS).
The coemulsifier can be selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80; preferably, the co-emulsifier is selected from one or more of span 20, span 60 and tween 80.
According to the invention, the initiator may be a water-soluble initiator, which may be an oxidation-reduction initiation system consisting of a persulfate oxidizer and a sulfite reducer. In a preferred aspect, the persulfate is used in an amount of 0.01 to 0.1% by weight and the sulfite is used in an amount of 0.005 to 0.05% by weight, based on the total amount of the monomer A and the monomer B, that is, the persulfate is used in an amount of 0.01 to 0.1% by weight and the sulfite is used in an amount of 0.005 to 0.05% by weight, based on the total amount of the monomer A and the monomer B. For example, the oxidizing agent in the redox initiator may be a 0.2 wt% aqueous solution of potassium persulfate and/or a 0.2 wt% aqueous solution of ammonium persulfate; the reducing agent in the redox initiator may be 0.1 wt% aqueous potassium bisulfite solution and/or 0.1 wt% aqueous sodium bisulfite solution.
Further preferably, the persulfate is used in an amount of 0.01 to 0.05% by weight and the sulfite is used in an amount of 0.01 to 0.05% by weight based on the total amount of the monomer A and the monomer B, more preferably.
Preferably, the chain transfer agent may be a 0.1 wt% aqueous solution of tetramethylethylenediamine; and the amount of the chain transfer agent is 0.01 to 0.1 weight percent based on the total amount of the monomer A and the monomer B; more preferably, the chain transfer agent is used in an amount of 0.01 to 0.05 wt%, which is more effective.
The invention provides a preparation method of a polymer with selective water plugging function, wherein the preparation method comprises the following steps:
(1) mixing a monomer A, a monomer B and water to form an aqueous solution;
(2) mixing an oil-soluble resin and an emulsifier with the aqueous solution to form an emulsion;
(3) carrying out polymerization reaction on the emulsion in the presence of an initiator and a chain transfer agent;
wherein the monomer A can be acrylamide; the monomer B can be a sulfonic acid monomer, and the sulfonic acid monomer can be 2-acrylamido-2-methylpropanesulfonic acid; the oil-soluble resin can be one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier comprises a primary emulsifier and/or a co-emulsifier.
Preferably, the oil-soluble resin may be one or more of an oil-soluble phenolic resin, a petroleum resin and a coumarone resin.
The polymerization reaction can also be carried out in the presence of a protective gas, which can preferably be nitrogen.
According to the invention, based on 100 parts by weight of water, the monomer A is used in an amount of 0.9-20 parts by weight, the monomer B is used in an amount of 0.1-5 parts by weight, the oil-soluble resin is used in an amount of 20-40 parts by weight, the main emulsifier is used in an amount of 4.5-9.5 parts by weight, and the co-emulsifier is used in an amount of 0.5-5.5 parts by weight; preferably, the amount of the monomer A is 9-20 parts by weight, the amount of the monomer B is 1-5 parts by weight, the amount of the oil-soluble resin is 30-40 parts by weight, the amount of the main emulsifier is 5-7 parts by weight, and the amount of the co-emulsifier is 2-5 parts by weight, based on 100 parts by weight of water.
Further preferably, the total amount of the monomer A and the monomer B is 10 to 25% by weight based on 100 parts by weight of water.
Further preferably, the emulsifier is a main emulsifier and a co-emulsifier, and the total amount of the main emulsifier and the co-emulsifier is 5-10 parts by weight based on 100 parts by weight of water.
Preferably, the polymers produced have a wash-out factor of greater than 50 PV.
According to the present invention, the primary emulsifier may be selected from one or more of sodium dodecyl sulfonate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; preferably, the main emulsifier is selected from one or more of sodium dodecyl sulfonate and/or sodium dodecyl benzene sulfonate.
The coemulsifier can be selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80; preferably, the co-emulsifier is selected from one or more of span 20, span 60 and tween 80.
According to the invention, the initiator may be a water-soluble initiator, which may be an oxidation-reduction initiation system consisting of a persulfate oxidizer and a sulfite reducer. In a preferred aspect, the persulfate is used in an amount of 0.01 to 0.1% by weight and the sulfite is used in an amount of 0.005 to 0.05% by weight, based on the total amount of the monomer A and the monomer B, that is, the persulfate is used in an amount of 0.01 to 0.1% by weight and the sulfite is used in an amount of 0.005 to 0.05% by weight, based on the total amount of the monomer A and the monomer B. For example, the oxidizing agent in the redox initiator may be a 0.2 wt% aqueous solution of potassium persulfate and/or a 0.2 wt% aqueous solution of ammonium persulfate; the reducing agent in the redox initiator may be 0.1 wt% aqueous potassium bisulfite solution and/or 0.1 wt% aqueous sodium bisulfite solution.
Preferably, the persulfate is used in an amount of 0.01 to 0.05 wt% and the sulfite is used in an amount of 0.01 to 0.05 wt%, based on the total amount of the monomer A and the monomer B, and the effect is more excellent.
The chain transfer agent may be a 0.1 wt% aqueous solution of tetramethylethylenediamine; and the amount of the chain transfer agent is 0.01 to 0.1 weight percent based on the total amount of the monomer A and the monomer B; preferably, the chain transfer agent is used in an amount of 0.01 to 0.05% by weight based on the total amount of the monomer A and the monomer B, and the effect is more excellent.
According to the invention, in step (1), the pH of the aqueous solution is preferably carried out at a pH of from 6 to 10. The pH may be obtained by adding a pH adjuster, which may be various pH adjusters conventional in the art, to the mixed system, for example, at least one of sodium hydroxide, sodium carbonate, potassium carbonate and ammonia water, preferably sodium hydroxide and/or sodium carbonate.
According to the present invention, in step (3), the conditions of the polymerization reaction may include: the temperature is 20-40 deg.C, preferably 25-35 deg.C, and the time is 6-8 hr, preferably 7-8 hr.
In order to obtain the polymer finished product with the selective water plugging function, the method can also comprise the steps of granulating, drying, crushing and screening the obtained polymer colloid to obtain the polymer finished product with the selective water plugging function.
In the present invention, the environmental conditions of the oil field may include: the temperature is 40-130 ℃, preferably 70-110 ℃, and more preferably 95-110 ℃; the degree of mineralization is 100-200,000mg/L, preferably 10,000-100,000mg/L, more preferably 60,000-100,000mg/L, and most preferably 85,000-100,000 mg/L.
According to a preferred embodiment of the present invention, the preparation method of the polymer with selective water plugging function comprises the following steps:
step 1: adding the monomer A, the monomer B and water into a polymerization reaction bottle (a heat-preservation polymerization bottle) to prepare an aqueous solution, and adjusting the pH value of the aqueous solution to 6-10 by using alkali;
step 2: adding oil-soluble resin and an emulsifier into the aqueous solution obtained in the step 1, and uniformly stirring to form emulsion;
and 3, step 3: blowing nitrogen for 5-60min at the temperature of 20-40 ℃, adding an initiator and a chain transfer agent into the emulsion obtained in the step 2, blowing nitrogen to uniformly mix the mixture, and carrying out sealed polymerization for 6-8h to obtain a polymer colloid;
and 4, step 4: and taking out the colloid, and then granulating, drying, crushing and screening to obtain a polymer finished product with the selective water plugging function.
The third aspect of the invention provides the polymer with the selective water plugging function prepared by the method.
The fourth aspect of the invention provides an application of the polymer with the selective water plugging function as a selective water plugging agent.
In the application of the polymer with the selective water plugging function as the selective water plugging agent, a specific application method is well known by the technical personnel in the field.
The invention adopts a polymerization method to synthesize the water-based water plugging material containing oil-soluble polymer particles in a system, namely, acrylamide monomers are polymerized in a water phase, resin particles are embedded to form a composite system which takes a water-soluble polymer continuous phase and the resin particles as a suspension phase, and the oil/water selectivity of the water plugging material is improved through different action mechanisms of two phases and oil and water, so that the effect of plugging water without plugging oil is achieved. According to the technical scheme, oil-soluble polymer particles are obtained by polymerizing oil-soluble resin and are used for improving the temperature resistance, salt resistance and oil/water selectivity of the polymer.
The present invention will be described in detail below by way of examples.
The oil-soluble phenolic resin is purchased from Jining HuaKai resin Co., Ltd, and has the brand number of 2402;
the petroleum resin is purchased from Jitian chemical industry Co., Ltd, Shenzhen, and the brand is C5C 9;
coumarone resin was purchased from Shandong Xiang Showa New materials Co., Ltd, and was designated 18 #;
the acrylamide raw material is a product sold in the market and produced by Shandong Baomo biochemical industry Co., Ltd;
the raw material of the 2-acrylamide-2-methylpropanesulfonic acid is a commercial product of high-quality products produced by Xiamen chemical Limited.
In the following examples, the test methods involved are as follows:
the plugging rate is carried out on a rock core flow test device according to the plugging rate test procedure in SY/T5840-2007 bridge plugging material indoor test method for drilling fluid. Specifically, the method comprises the following steps:
and (3) measuring the water plugging rate: loading the artificial core into core holder, saturating with water, and measuring its pore volume PV and water phase permeability (K)w1) Then injecting 1.0PV water shutoff agent, curing for 24h at 90 ℃, and measuring the permeability (K) of the mixture after adding the water shutoff agent by using waterw2)，Kw2And Kw1Ratio (K)w2/Kw1)
Namely the water plugging rate.
And (3) measuring the oil plugging rate: loading the artificial core into core holder, saturating with oil, and measuring its pore volume PV and oil phase permeability (K)o1) Then injecting 1.0PV water shutoff agent, curing for 24h at 90 deg.C, and measuring the permeability (K) after adding water shutoff agent with oilo2)，Ko2And Ko1Of (K)o2/Ko1) Namely the oil plugging rate.
And (3) measuring the scouring resistance multiple: after the water plugging rate is measured, water with 50 times of pore volume multiple (PV) is continuously injected into the rock core, the permeability under different PV numbers is recorded, the water plugging rate under different PV numbers is calculated according to the measuring method of the water plugging rate, and the scouring resistance multiple is the maximum PV number of the injected water when the water plugging rate is more than or equal to 80%. Normally, the water blocking rate at 50PV number is measured, and the value is more than or equal to 80 percent, which indicates that the material has excellent flushing resistance.
Wherein the artificial core is obtained by filling quartz sand of 40-60 meshes in a mould.
Example 1
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
1. Weighing 90.0g of acrylamide (based on 100 parts by weight of water, the amount of the monomer A is 9 parts by weight) and 10.0g of 2-acrylamido-2-methylpropanesulfonic acid (based on 100 parts by weight of water, the amount of the monomer B is 1 part by weight) into 1000mL of water, stirring and fully dissolving, and then adjusting the pH value of the aqueous solution to 6.0 by using alkali (sodium hydroxide) to obtain a stable aqueous solution;
2. weighing 200.0g of oil-soluble phenolic resin (the amount of the oil-soluble phenolic resin is 20 parts by weight based on 100 parts by weight of water), 50.0g of main emulsifier SDBS (the amount of the main emulsifier is 5 parts by weight based on 100 parts by weight of water) and 45.0g of auxiliary emulsifier span 20 (the amount of the auxiliary emulsifier is 4.5 parts by weight based on 100 parts by weight of water) into the solution, and fully stirring to form stable emulsion;
3. adding 0.2 weight percent of potassium persulfate aqueous solution 0.5g, 0.1 weight percent of sodium bisulfite aqueous solution 0.5g (based on 100g of the total dosage of the monomer A and the monomer B, the dosage of the persulfate is 0.1 weight percent, and the dosage of the sulfite is 0.05 weight percent) and 0.1g of tetramethylethylenediamine aqueous solution (based on 100g of the total dosage of the monomer A and the monomer B, the dosage of the chain transfer agent is 0.01 weight percent) into the emulsion in the step 2 in sequence, stirring fully and emulsifying, raising the temperature to 20 ℃, and initiating polymerization for 6 hours to obtain a polymer colloid containing resin particles;
4. and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 1.
As a result of the test, under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ1 is 92.5 percent, the oil blocking rate is 8.6 percent, and the scouring resistance multiple is more than 50 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Example 2
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
1. Weighing 100.0g of acrylamide (based on 100 parts by weight of water, the amount of the monomer A is 10 parts by weight) and 50.0g of 2-acrylamido-2-methylpropanesulfonic acid (based on 100 parts by weight of water, the amount of the monomer B is 5 parts by weight) into 1000mL of water, stirring and fully dissolving, and then adjusting the pH value of the aqueous solution to 7.0 by using alkali (sodium carbonate) to obtain a stable aqueous solution;
2. weighing 300.0g of petroleum resin (based on 100 parts by weight of water, the using amount of the oil-soluble resin is 30 parts by weight), 70.0g of main emulsifier SDBS (based on 100 parts by weight of water, the using amount of the main emulsifier is 7 parts by weight) and 30.0g of auxiliary emulsifier span 60 (based on 100 parts by weight of water, the using amount of the auxiliary emulsifier is 3 parts by weight), adding into the solution, and fully stirring to form stable emulsion;
3. adding 0.2 weight percent of potassium persulfate aqueous solution 0.25g, 0.1 weight percent of sodium bisulfite aqueous solution 0.5g (based on the total dosage of 150g of the monomer A and the monomer B, the dosage of the persulfate is 0.033 weight percent, and the dosage of the sulfite is 0.033 weight percent) and tetramethylethylenediamine aqueous solution 0.75g (based on the total dosage of 150g of the monomer A and the monomer B, the dosage of the chain transfer agent is 0.05 weight percent) into the emulsion in the step 2 in sequence, stirring fully and emulsifying, raising the temperature to 25 ℃, and initiating polymerization for 6 hours to obtain polymer colloid containing resin particles;
4. and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 2.
As a result of the test, under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ2 is 92.5 percent, the oil blocking rate is 8.6 percent, and the scouring resistance multiple is more than 50 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Example 3
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
1. Weighing 150.0g of acrylamide (based on 100 parts by weight of water, the amount of the monomer A is 15 parts by weight) and 50.0g of 2-acrylamido-2-methylpropanesulfonic acid (based on 100 parts by weight of water, the amount of the monomer B is 5 parts by weight) into 1000mL of water, stirring and fully dissolving, and then adjusting the pH value of the aqueous solution to 8.0 by using alkali (sodium hydroxide) to obtain a stable aqueous solution;
2. weighing 400.0g of coumarone resin (based on 100 parts by weight of water, the using amount of the oil-soluble resin is 40 parts by weight), 50.0g of main emulsifier SDBS (based on 100 parts by weight of water, the using amount of the main emulsifier is 5 parts by weight) and 50.0g of co-emulsifier Tween 80 (based on 100 parts by weight of water, the using amount of the co-emulsifier is 5 parts by weight), adding into the solution, and fully stirring to form stable emulsion;
3. adding 0.2% potassium persulfate aqueous solution 0.5g, 0.1% sodium bisulfite aqueous solution 1g (based on the total amount of 200g of the monomer A and the monomer B, the amount of the persulfate is 0.05 wt%, and the amount of the sulfite is 0.05 wt%) and tetramethylethylenediamine aqueous solution 2g (based on the total amount of 200g of the monomer A and the monomer B, the amount of the chain transfer agent is 0.1 wt%) into the emulsion in the step 2 in sequence, stirring and emulsifying sufficiently, raising the temperature to 25 ℃, and initiating polymerization for 8 hours to obtain a polymer colloid containing resin particles;
4. and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 3.
As a result of the test, under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ3 is 99.8%, the oil blocking rate is 4.2%, and the scouring resistance multiple is more than 50 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Example 4
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
1. 200.0g of acrylamide (based on 100 parts by weight of water, the amount of the monomer A is 20 parts by weight) and 50.0g of 2-acrylamido-2-methylpropanesulfonic acid (based on 100 parts by weight of water, the amount of the monomer B is 5 parts by weight) are weighed and added into 1000mL of water to be stirred and fully dissolved, and then alkali (sodium carbonate) is used for adjusting the pH value of the aqueous solution to 8.0, so as to obtain a stable aqueous solution;
2. weighing 400.0g of coumarone resin (based on 100 parts by weight of water, the using amount of the oil-soluble resin is 40 parts by weight), 50.0g of main emulsifier SDBS (based on 100 parts by weight of water, the using amount of the main emulsifier is 5 parts by weight) and 50.0g of co-emulsifier Tween 80 (based on 100 parts by weight of water, the using amount of the co-emulsifier is 5 parts by weight), adding into the solution, and fully stirring to form stable emulsion;
3. adding 0.2% potassium persulfate aqueous solution 0.125g, 0.1% sodium bisulfite aqueous solution 0.25g (based on the total amount of 250g of the monomer A and the monomer B, the amount of the persulfate is 0.01 wt%, and the amount of the sulfite is 0.01 wt%) and tetramethylethylenediamine aqueous solution 1.25g (based on the total amount of 250g of the monomer A and the monomer B, the amount of the chain transfer agent is 0.05 wt%) into the emulsion in the step 2 in sequence, stirring and emulsifying fully, raising the temperature to 40 ℃, and initiating polymerization for 7 hours to obtain a polymer colloid containing resin particles;
4. and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 4.
As a result of the test, under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ4 is 96.8%, the oil blocking rate is 6.5%, and the scouring resistance multiple is more than 65 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Example 5
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
The same method as that of example 1 for preparing a polymer having a selective water shutoff function was employed, except that: the monomers used in the present examples were different, specifically:
the amount of acrylamide used was 50g (based on 100 parts by weight of water, the amount of monomer A used was 5 parts by weight), the amount of 2-acrylamido-2-methylpropanesulfonic acid used was 60g (based on 100 parts by weight of water, the amount of monomer B used was 6 parts by weight), the amount of oil-soluble phenol resin used was 200g (based on 100 parts by weight of water, the amount of oil-soluble resin used was 20 parts by weight), the amount of primary emulsifier SDBS used was 60g (based on 100 parts by weight of water, the amount of primary emulsifier used was 6 parts by weight) and the amount of co-emulsifier span 20 used was 40.0g (based on 100 parts by weight of water, the amount of co-emulsifier used was 4 parts by weight).
The rest was the same as in example 1 to obtain a polymer colloid containing resin particles;
and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 5.
And (3) testing results: under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ5 is 99.5 percent, the oil blocking rate is 5.3 percent, the scouring resistance multiple is more than 60PV, and specifically, the scouring resistance multiple is 60-70 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Example 6
This example illustrates a polymer having selective water shutoff functionality prepared by the method of the present invention.
The same method as that of example 1 for preparing a polymer having a selective water shutoff function was employed, except that: the monomers used in the present examples were different, specifically:
the amount of acrylamide used was 80g (based on 100 parts by weight of water, the amount of monomer A used was 8 parts by weight), the amount of 2-acrylamido-2-methylpropanesulfonic acid used was 30g (based on 100 parts by weight of water, the amount of monomer B used was 3 parts by weight), the amount of oil-soluble phenol resin used was 300g (based on 100 parts by weight of water, the amount of oil-soluble resin used was 30 parts by weight), the amount of main emulsifier SDBS used was 80g (based on 100 parts by weight of water, the amount of main emulsifier used was 8 parts by weight) and the amount of co-emulsifier span 20 used was 20g (based on 100 parts by weight of water, the amount of co-emulsifier used was 2 parts by weight).
The rest was the same as in example 1 to obtain a polymer colloid containing resin particles;
and granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely DSJ 6.
And (3) testing results: under the conditions of high temperature (95 ℃) and high salt (the mineralization degree is 100,000mg/L), the water blocking rate of the DSJ6 is 99.3%, the oil blocking rate is 5.2%, the scouring resistance multiple is more than 80PV, and specifically, the scouring resistance multiple is 80-90 PV.
The water plugging material prepared in the embodiment has excellent selective plugging rate and flushing resistance on oil/water, and particularly still has better selective plugging rate on oil/water under high temperature and high salt conditions.
Comparative example 1
The same method as that of example 1 for preparing a polymer having a selective water shutoff function was employed, except that: the monomers used in this example were varied, specifically, the amount of acrylamide used was 210g (the amount of monomer a used was 21 parts by weight based on 100 parts by weight of water), the amount of 2-acrylamido-2-methylpropanesulfonic acid used was 60g (the amount of monomer B used was 6 parts by weight based on 100 parts by weight of water), the amount of oil-soluble phenol resin used was 100g (the amount of oil-soluble resin used was 10 parts by weight based on 100 parts by weight of water), the amount of main emulsifier SDBS used was 40g (the amount of main emulsifier used was 4 parts by weight based on 100 parts by weight of water) and the amount of co-emulsifier span 20 used was 100g (the amount of co-emulsifier used was 10 parts by weight based on 100 parts by weight of water).
The rest of the procedure was the same as in example 1, to obtain a polymer colloid containing resin particles.
And granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely D1.
And (3) testing results: under the conditions of high temperature (95 ℃) and high salt (the degree of mineralization is 100,000mg/L), the water blocking rate of the D1 is 80.3 percent, the oil blocking rate is 12.6 percent, and the scouring resistance multiple is 2 PV.
The water plugging material prepared by the comparative example does not have excellent selective plugging rate and flushing resistance on oil/water, and particularly does not have good selective plugging rate on oil/water under high-temperature and high-salt conditions.
Comparative example 2
The same method as that of example 1 for preparing a polymer having a selective water shutoff function was employed, except that: the monomers used in this example were different, specifically, the amount of acrylamide used was 200g (the amount of monomer a used was 20 parts by weight based on 100 parts by weight of water), the amount of 2-acrylamido-2-methylpropanesulfonic acid used was 100g (the amount of monomer B used was 10 parts by weight based on 100 parts by weight of water), the amount of oil-soluble phenol resin used was 500g (the amount of oil-soluble resin used was 50 parts by weight based on 100 parts by weight of water), the amount of main emulsifier SDBS used was 40g (the amount of main emulsifier used was 4 parts by weight based on 100 parts by weight of water) and the amount of co-emulsifier 20 used was 30g (the amount of co-emulsifier used was 3 parts by weight based on 100 parts by weight of water).
The rest of the procedure was the same as in example 1, to obtain a polymer colloid containing resin particles.
And granulating, drying and crushing the polymer colloid to obtain a powder type water plugging material, and preparing the water plugging material into an aqueous solution with the mass concentration of 0.1% by adopting simulated saline with the mineralization degree of 100,000mg/L, namely D2.
And (3) testing results: under the conditions of high temperature (95 ℃) and high salt (the degree of mineralization is 100,000mg/L), the water blocking rate of the D2 is 78.5 percent, the oil blocking rate is 16.5 percent, and the scouring resistance multiple is 0 PV.
The water plugging material prepared by the comparative example does not have excellent selective plugging rate and flushing resistance on oil/water, and particularly does not have good selective plugging rate on oil/water under high-temperature and high-salt conditions.
According to the embodiments and the comparative examples, the acrylamide monomer, the sulfonic acid monomer, the oil-soluble resin and the emulsifier are added into the aqueous solution, a stable emulsion system is formed after stirring, the initiator and the chain transfer agent are added, the initiation and the polymerization are carried out at the temperature of 20-40 ℃ to obtain the polymer colloid containing the resin particles, and the polymer colloid is granulated, dried and crushed to obtain the powder type water plugging material. According to the field requirements of the oil field, the water plugging agent with different mass concentrations can be prepared by adopting field water; and the dosage of the acrylamide monomer, the sulfonic acid monomer, the oil-soluble resin and the emulsifier meets the range defined above, the invention can be completed, and the invention has excellent effect.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (7)

1. A preparation method of a water-based water plugging material containing oil-soluble polymer particles and having a selective water plugging function is characterized by comprising the following steps:
(1) mixing the monomer A, the monomer B and water to form an aqueous solution with the pH value of 6-10;
(2) mixing an oil-soluble resin and an emulsifier with the aqueous solution to form an emulsion;
(3) carrying out polymerization reaction on the emulsion for 6-8 hours at the temperature of 20-40 ℃ in the presence of an initiator and a chain transfer agent;
wherein the monomer A is acrylamide; the monomer B is a sulfonic acid monomer, and the sulfonic acid monomer is 2-acrylamide-2-methylpropanesulfonic acid; the oil-soluble resin is one or more of rosin resin, dammar resin, oil-soluble phenolic resin, petroleum resin, terpene resin and coumarone resin; the emulsifier comprises a main emulsifier and a co-emulsifier;
the weight ratio of the monomer A to the monomer B is 0.9-20 parts, the weight ratio of the monomer B to the monomer B is 0.1-5 parts, the weight ratio of the oil-soluble resin to the oil-;
wherein the main emulsifier is selected from one or more of sodium dodecyl sulfate, sodium dodecyl sulfate and sodium dodecyl benzene sulfonate;
the auxiliary emulsifier is selected from one or more of span 20, span 40, span 60, span 80, tween 20, tween 40, tween 60 and tween 80;
wherein the initiator is a water-soluble initiator, and the water-soluble initiator is an oxidation-reduction initiation system of persulfate-sulfite; the chain transfer agent is a tetramethylethylenediamine aqueous solution;
wherein the total amount of the monomer A and the monomer B is taken as a reference, the persulfate is used in an amount of 0.01-0.1 wt%, and the sulfite is used in an amount of 0.005-0.05 wt%; and the chain transfer agent is used in an amount of 0.01 to 0.1% by weight.
2. The method of claim 1, wherein the monomer a is used in an amount of 9 to 20 parts by weight, the monomer B is used in an amount of 1 to 5 parts by weight, the oil-soluble resin is used in an amount of 30 to 40 parts by weight, the primary emulsifier is used in an amount of 5 to 7 parts by weight, and the co-emulsifier is used in an amount of 2 to 5 parts by weight, based on 100 parts by weight of water.
3. The method of claim 1, wherein the polymer has a wash-out factor greater than 50 PV.
4. The method of claim 1, wherein the primary emulsifier is selected from sodium dodecyl sulfonate and/or sodium dodecyl benzene sulfonate; the coemulsifier is selected from one or more of span 20, span 60 and tween 80.
5. The method according to claim 1, wherein the temperature is 25 to 35 ℃ and the time is 7 to 8 hours.
6. The water-based water plugging material containing the oil-soluble polymer particles and having the selective water plugging function, which is prepared by the method of any one of claims 1 to 5.
7. The application of the water-based water plugging material containing oil-soluble polymer particles with selective water plugging function in claim 6 as a selective water plugging agent.
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