CN113621107B - Reverse emulsion hyperbranched polymer filtrate reducer for drilling fluid and preparation method and application thereof - Google Patents
Reverse emulsion hyperbranched polymer filtrate reducer for drilling fluid and preparation method and application thereof Download PDFInfo
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- CN113621107B CN113621107B CN202010382426.3A CN202010382426A CN113621107B CN 113621107 B CN113621107 B CN 113621107B CN 202010382426 A CN202010382426 A CN 202010382426A CN 113621107 B CN113621107 B CN 113621107B
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
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- C09K8/035—Organic additives
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Abstract
The invention provides a preparation method of an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid, which comprises the following steps: and (3) carrying out polymerization reaction on water, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, a RAFT chain transfer agent, a branching agent, a hydrophilic emulsifier, base oil, a lipophilic emulsifier and a persulfate initiator to obtain the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid. The invention also provides an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid and application thereof. The polymer filtrate reducer provided by the invention has good temperature resistance and salt resistance, is convenient to use, has outstanding filtrate reduction effect, and can be widely used for drilling fluid.
Description
Technical Field
The invention relates to the technical field of drilling fluid treatment agents, in particular to an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid, a preparation method and application thereof.
Background
The drilling fluid treating agent is the core of a drilling fluid system, researches the high-performance treating agent, improves the comprehensive effects (such as temperature resistance, salt resistance, high-temperature stability, shear stability and the like) of the existing treating agent, and plays an important role in promoting the technical progress of the treating agent and meeting the high-temperature high-pressure drilling requirements. At present, the on-site application synthetic polymers are all linear polymers, the molecular chain length is high, the shear chain is broken at Wen Houyi, the viscosity is greatly reduced, and the high-temperature stability of the drilling fluid is deteriorated; the chain length of the molecule, the existence of salt is easy to curl, and the salt resistance is insufficient; the hyperbranched polymer has a highly branched three-dimensional spherical structure, short branched chain, difficult chain breakage under the action of high temperature, even if part of chain structure is damaged, the secondary structure can still function, the branched chain is short, and difficult curling deformation under the action of salt, so the hyperbranched polymer has better temperature resistance and salt resistance, strong shearing resistance, good thermal stability and longer action time in drilling fluid; the branching degree is high, the group density is high, the denaturation of adsorption groups is more favorably inhibited, the branching degree is high, the group density is high, and the lifting and cutting capacity in drilling fluid is stronger; the viscosity effect is low, the method is more suitable for high-density drilling fluid, and solves the contradiction among high-density drilling fluid rheological property, suspension stability and fluid loss.
The hyperbranched polymer can greatly improve the comprehensive effect and the use efficiency of the treating agent, is the development trend of the treating agent for drilling fluid, and the development of a novel high-performance treating agent for drilling fluid becomes an important research direction of the technology.
Disclosure of Invention
In view of the above, the invention aims to provide an inverse emulsion hyperbranched polymer fluid loss additive for drilling fluid and a preparation method thereof.
The invention provides a preparation method of an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid, which comprises the following steps:
and (3) carrying out polymerization reaction on water, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, a RAFT chain transfer agent, a branching agent, a hydrophilic emulsifier, base oil, a lipophilic emulsifier and a persulfate initiator to obtain the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid.
In the present invention, the RAFT chain transfer agent is preferably selected from isobutyl xanthate. The source of the RAFT chain transfer agent is not particularly limited and may be prepared according to methods well known to those skilled in the art, e.g. isobutyl xanthate in the present invention may be obtained by reacting isobutanol, carbon disulphide with sodium 3-chloro-2-hydroxypropane sulfonate.
In the present invention, the branching agent is preferably selected from one of N, N-methylenebisacrylamide or polyethylene glycol dimethacrylate.
In the present invention, the hydrophilic emulsifier is preferably selected from tween 80 or tween 60.
In the present invention, the base oil preferably has a kinematic viscosity at 40℃of 1.5 mPas to 3.0 mPas, more preferably 2.0 mPas to 2.5 mPas; the base oil is preferably a white oil, such as a # 2 or # 3 white oil.
In the present invention, the lipophilic emulsifier is preferably selected from span 80 or span 60.
In the present invention, the persulfate initiator is preferably selected from potassium persulfate or ammonium persulfate.
In the invention, the mass ratio of the water, the 2-acrylamido-2-methylpropanesulfonic acid, the acrylamide, the RAFT chain transfer agent, the branching agent, the hydrophilic emulsifier, the base oil, the lipophilic emulsifier and the persulfate initiator is preferably (204-225): (61.6 to 78.86): (63.4 to 81.14): (0.125-0.32): (0.1875-0.5): (1.224-1.8): (136-150): (11.016-16.2): (0.25 to 0.32), more preferably (210 to 220): (65-75): (65-75): (0.2-0.3): (0.2-0.4): (1.4-1.6): (140-145): (12-15): (0.27 to 0.3), most preferably (213 to 217): (68-72): (68-72): (0.23-0.27): (0.25-0.35): 1.5: (142-143): (13-14): (0.28-0.0.29).
In the present invention, the polymerization reaction is preferably carried out under the protection of an inert gas, preferably nitrogen, more preferably high purity nitrogen.
In the present invention, the polymerization reaction preferably includes:
mixing water, 2-acrylamide-2-methylpropanesulfonic acid, part of acrylamide, a RAFT chain transfer agent, part of branching agent, persulfate initiator and hydrophilic emulsifier to obtain a water phase material;
mixing base oil and a lipophilic emulsifier to obtain an oil phase material;
and mixing the water phase material and the oil phase material for emulsification, dropwise adding the rest acrylamide and the rest branching agent after 2-4 hours of reaction (first-step reaction), and continuing the reaction (second-step reaction) for 3-5 hours to obtain the reverse emulsion hyperbranched polymer filtrate reducer for drilling fluid.
In the invention, after the aqueous phase material is obtained, the pH value of the aqueous phase material is preferably adjusted to 9-11, and an alkaline substance is preferably adopted to adjust the pH value of the aqueous phase material, wherein the alkaline substance is preferably selected from potassium hydroxide or a compound of potassium hydroxide and sodium hydroxide; the mass ratio of the potassium hydroxide to the sodium hydroxide in the compound of the potassium hydroxide and the sodium hydroxide is preferably (1-5): 1, more preferably (2 to 4): 1, most preferably 3:1.
In the present invention, the emulsification method preferably comprises:
and (3) placing the mixture obtained by mixing the water phase material and the oil phase material in a water bath, and introducing inert gas to emulsify.
In the present invention, the temperature of the water bath is preferably 30 to 45 ℃, more preferably 35 to 40 ℃.
In the present invention, the inert gas is preferably nitrogen, more preferably high purity nitrogen; the time for introducing the inert gas is preferably 25 to 35 minutes, more preferably 30 minutes.
In the present invention, the method of emulsification more preferably comprises:
adding the water-based material into an oil-phase material, stirring, and emulsifying at a high speed to obtain emulsion;
the emulsion was placed in a water bath, inert gas was introduced, and the reaction was carried out with stirring at a low speed (first reaction step).
In the present invention, the stirring time is preferably 15 to 25 minutes, more preferably 20 minutes.
In the present invention, the speed of the high-speed emulsification is preferably 8000 to 12000r/min, more preferably 9000 to 11000r/min, and most preferably 10000r/min; the time for the high-speed emulsification is preferably 15 to 25 minutes, more preferably 20 minutes.
In the present invention, the speed of the low-speed stirring is preferably 2000 to 4000r/min, more preferably 2500 to 3500r/min, and most preferably 3000r/min; the time for the low-speed stirring is preferably 3 to 5 hours, more preferably 4 hours.
In the present invention, the reaction (including the first-step reaction and the second-step reaction) is preferably performed under stirring, the first-step reaction is a random branching reaction, the temperature of the first-step reaction is preferably 30 to 40 ℃, more preferably 35 ℃, and the first-step reaction time is preferably 2 to 4 hours, more preferably 3 hours; the second reaction is a hyperbranched polymer reaction, the temperature of the second reaction is preferably 30-40 ℃, more preferably 35 ℃, and the time of the second reaction is preferably 3-5 h, more preferably 4h.
In the present invention, the total mass of the part of acrylamide and the mass of the remaining acrylamide is the total amount of acrylamide, and the mass of the part of acrylamide is preferably 75 to 85% of the total amount of acrylamide, more preferably 80%; the mass of the remaining acrylamide is preferably 15 to 25% of the total amount of acrylamide, more preferably 20%.
In the present invention, the sum of the mass of the partial branching agent and the mass of the remaining branching agent is the total amount of branching agents, and the mass ratio of the partial branching agent to the remaining branching agent is preferably (0.0625 to 0.08): (0.125 to 0.72), more preferably 0.07: (0.2 to 0.6), most preferably 0.07: (0.3-0.5).
The preparation method of the reverse emulsion hyperbranched polymer filtrate reducer adopts a RAFT reversible addition-fragmentation chain transfer polymerization mode, firstly generates random hyperbranched polymer, generates chain growth and chain transfer reaction of monomer free radicals under the action of an initiator, a RAFT chain transfer agent and a branching agent, controls the branching degree of the polymer by controlling the ratio of the initiator to the RAFT, and inhibits the generation of oligomers and gel; the existence of RAFT groups enables reversible chain growth and chain transfer of monomer free radicals to occur, and the rapid and effective chain transfer reaction inhibits termination reaction, so that the polymer chain keeps active; and the second step is to drop a certain amount of branching agent and polymerizable monomer (acrylamide) based on the random hyperbranched polymer in the first step, and further carry out branching reaction by utilizing the activity of the terminal chain. Therefore, the polymer prepared by the invention belongs to hyperbranched polymer products with double-branched structures, wherein the hyperbranched polymer core is firstly generated in the first step, the branched chains are initiated outside the hyperbranched polymer core in the second step, the adsorption sites are more, and the filtration reducing performance in drilling fluid is better.
In the preparation process, the pH value of the system is regulated by adopting potassium hydroxide or a compound of potassium hydroxide and sodium hydroxide, the heat dissipation capacity of the system is balanced, and the potential safety hazard of a process flow caused by overlarge heat at a certain stage is avoided; controlling the pH value of the system, balancing the reactivity ratio among monomers, adjusting the reaction time of different initiation stages, balancing the monomer conversion rate of each stage, balancing the heat dissipation capacity of each stage system, and ensuring the stable reaction; the low-temperature initiation is adopted, and the temperature change range is small (controlled within 3 ℃) in the whole reaction process. The hyperbranched polymer filtrate reducer prepared by the method provided by the invention has the advantages that the apparent viscosity of a 1.0% polymer solution is less than or equal to 25.0 mPa.s, when the product addition is 3.0%, the API (application program interface) in the composite brine slurry after 165 ℃/16h is less than 5.0mL, and the API after 180 ℃/16h is less than 15mL (compared with the same type of linear polymer filtrate reducer, the filtrate reduction rate is more than 70%).
The invention also provides the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid, which is prepared by the method.
The invention also provides a drilling fluid, which comprises the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid. The components of the drilling fluid are not particularly limited, and a person skilled in the art can select the drilling fluid with proper components according to actual needs, and the reverse emulsion hyperbranched polymer fluid loss additive for the drilling fluid can be added into the drilling fluid. In the invention, the mass content of the reverse emulsion hyperbranched polymer fluid loss additive for the drilling fluid in the drilling fluid is preferably 2.5-3.5%, more preferably 3%.
Aiming at the technical problems of high molecular weight, large viscosity effect, insufficient temperature resistance and salt resistance in drilling fluid and greatly increased fluid loss after high-temperature aging (higher than 150 ℃), the invention provides an inverse emulsion hyperbranched polymer fluid loss additive and a preparation method thereof.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other examples of modifications and alterations will be apparent to those skilled in the art based on the examples herein, and are intended to be within the scope of the invention.
The isobutyl xanthate adopted in the following examples of the invention is an intermediate prepared by reacting carbon disulfide with isobutanol in a mass ratio (0.2:0.1) under the action of a pH value regulator; the obtained intermediate reacts with 3-chloro-2-hydroxy propane sodium sulfonate at the mass ratio of (1.0:1.0) at the temperature of 25-30 ℃.
Example 1
Adding 225g of water into a reaction kettle, stirring and adding 61.6g of 2-acrylamide-2-methylpropanesulfonic acid, adding potassium hydroxide to adjust the pH value of a system to 10.0, sequentially adding 50.72g of acrylamide, 0.25g of isobutyl xanthate, 0.0625g of N, N-methylenebisacrylamide (branching agent), 0.25g of potassium persulfate and 1.8g of tween-80 emulsifier, and stirring until the mixture is completely dissolved to obtain a water phase;
150g of white oil and 16.2g of span-80 emulsifying agent are added into a reaction kettle, and stirred until all the materials are dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 20min, and emulsifying at high speed (8000 r/min) for 20min to obtain monomer compound emulsion; placing the emulsion in a constant-temperature water bath at 35 ℃, introducing nitrogen for 30min, reacting for 3h to obtain a hyperbranched polymer in the first step, adding the rest acrylamide and branching agent solution (12.68 mL water+12.68g acrylamide+0.5625g branching agent) in a stirring state, and reacting for 5h under low-speed stirring (2000 r/min) at 35 ℃ to obtain the target product fluid loss additive.
Example 2
Adding 210g of water into a reaction kettle, stirring and adding 73.92g of 2-acrylamide-2-methylpropanesulfonic acid, adding potassium hydroxide to adjust the pH value of a system to 9.5, sequentially adding 60.864g of acrylamide, 0.3g of isobutyl xanthate, 0.075g of N, N-methylene bisacrylamide (branching agent), 0.3g of ammonium persulfate and 1.68g of Tween-80 emulsifier, and stirring until all the components are dissolved to obtain a water phase;
140g of white oil and 15.12g of span-80 emulsifying agent are added into a reaction kettle, and stirred until all the materials are dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 20min, and emulsifying at high speed (9000 r/min) for 20min to obtain monomer compound emulsion; placing the emulsion in a constant-temperature water bath at 35 ℃, introducing nitrogen for 30min, reacting for 3h to obtain a first-step hyperbranched polymer, adding the rest acrylamide and branching agent solution (15.216 mL water+ 15.216g acrylamide+0.375 g branching agent) in a stirring state, and reacting for 5h under low-speed stirring at 35 ℃ at 3000r/min to obtain the target product filtrate reducer.
Example 3
Adding 204g of water into a reaction kettle, stirring and adding 79.86g of 2-acrylamide-2-methylpropanesulfonic acid, adding potassium hydroxide to adjust the pH value of a system to 10, sequentially adding 64.9g of acrylamide, 0.32g of isobutyl xanthate, 0.08g of polyethylene glycol dimethacrylate (branching agent), 0.21g of potassium persulfate, 0.11g of ammonium persulfate and 1.632g of tween-80 emulsifier, and stirring until the mixture is completely dissolved to obtain a water phase;
136g of white oil and 14.688g of span-80 emulsifying agent are added into a reaction kettle, and stirred until the mixture is completely dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 20min, and emulsifying at high speed (10000 r/min) for 20min to obtain monomer compound emulsion; placing the emulsion in a constant-temperature water bath at 35 ℃, introducing nitrogen for 30min, reacting for 4h to obtain a first-step hyperbranched polymer, adding the rest acrylamide and branching agent solution (16.228 mL water+ 16.228g acrylamide+0.4g branching agent) in a stirring state, and reacting for 3h under low-speed stirring at 35 ℃ (4000 r/min) to obtain the target product filtrate reducer.
Example 4
Adding 210g of water into a reaction kettle, stirring and adding 73.92g of 2-acrylamide-2-methylpropanesulfonic acid, adding potassium hydroxide to adjust the pH value of a system to 10, sequentially adding 60.864g of acrylamide, 0.3g of isobutyl xanthate, 0.075g of N, N-methylene bisacrylamide (branching agent), 0.3g of ammonium persulfate and 1.4g of tween-80 emulsifier, and stirring until all the components are dissolved to obtain a water phase;
140g of white oil and 12.6g of span-80 emulsifying agent are added into a reaction kettle, and stirred until all the materials are dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 20min, and emulsifying at high speed (11000 r/min) for 20min to obtain monomer compound emulsion; placing the emulsion in a constant-temperature water bath at 35 ℃, introducing nitrogen for 30min, reacting for 5h to obtain a hyperbranched polymer in the first step, adding the rest acrylamide and branching agent solution (15.216 mL water+ 15.216g acrylamide+0.6g branching agent) in a stirring state, and reacting for 5h under low-speed stirring at 35 ℃ at 3000r/min to obtain the target product filtrate reducer.
Example 5
Adding 210g of water into a reaction kettle, stirring and adding 73.92g of 2-acrylamide-2-methylpropanesulfonic acid, adding potassium hydroxide to adjust the pH value of a system to 11, sequentially adding 60.864g of acrylamide, 0.125g of isobutyl xanthate, 0.075g of N, N-methylene bisacrylamide (branching agent), 0.25g of ammonium persulfate and 1.68g of tween-80 emulsifier, and stirring until all the components are dissolved to obtain a water phase;
140g of white oil and 15.12g of span-80 emulsifying agent are added into a reaction kettle, and stirred until all the materials are dissolved to obtain an oil phase;
slowly adding the water phase into the oil phase under stirring, stirring for 20min, and emulsifying at high speed (12000 r/min) for 20min to obtain monomer compound emulsion; placing the emulsion in a constant-temperature water bath at 35 ℃, introducing nitrogen for 30min, reacting for 3h to obtain a hyperbranched polymer in the first step, adding the rest acrylamide and branching agent solution (15.216 mL water+ 15.216g acrylamide+0.125 g branching agent) in a stirring state, and reacting for 5h under low-speed stirring at 35 ℃ at 3000r/min to obtain the target product filtrate reducer.
The fluid loss additives prepared in examples 1 to 5 of the present invention were evaluated for drilling fluid properties: after the composite brine base slurry is added with 3% filtrate reducer, the composite brine base slurry is subjected to rolling aging for 16 hours at 165 ℃ and 180 ℃, and according to GB/T16783.1-2006, part 1 of the field test of drilling fluid for oil and gas industry: the water-based drilling fluid 7.2 provides for measuring the medium-pressure fluid loss of the drilling fluid, the temperature is 24+/-3 ℃, the pressure is 690KPa, and the detection result is shown in Table 1.
Preparation of composite brine-based slurry referring to Q/SHCG 99001-2017, part 1 of general detection and evaluation method for oilfield chemical: chemical agents for drilling fluids: 18.00g of sodium chloride, 2.00g of anhydrous calcium chloride and 5.20g of magnesium chloride are sequentially added into 400mL of distilled water, stirred for 20min on a high-speed stirrer (11000 r/min), then 1.05g of anhydrous sodium carbonate, 32.00g of sodium bentonite and 32.00g of evaluation soil are sequentially added, stirred for 20min on the high-speed stirrer (11000 r/min) and stopped at least twice, so as to scrape off clay adhered to the container wall, and the clay is hydrated for 24h at 25+/-1 ℃ in density, stirred for 5min, and then the part 1 is tested on site according to GB/T16783.1-2006 petroleum and natural gas industry drilling fluid: the water-based drilling fluid provides for measuring the filtration loss and apparent viscosity, wherein the filtration loss is controlled to be (90+/-10) mL, the apparent viscosity is in the range of (4+/-1) mPa.s, otherwise, the addition of the two kinds of soil is adjusted.
And (3) measuring the performance of the filtrate reducer: 400mL of the prepared composite brine slurry is taken, 12g of the filtrate reducer prepared in the examples 1-5 is respectively added, the mixture is stirred at a high speed (8000-11000 r/min) for 20min, the mixture is put into a high-temperature roller furnace and aged at 180 ℃ for 16h, the mixture is taken out and cooled to 25+/-1 ℃, the mixture is stirred at a high speed (11000 r/min) for 5min, and the mixture is tested in the section 1 according to GB/T16783.1-2006 petroleum and natural gas industrial drilling fluid on site: the water-based drilling fluid is tested according to the specification, and the test results are shown in table 1.
TABLE 1 Performance index of the fluid loss additives prepared in examples 1 to 5 of the present invention
As is clear from Table 1, the apparent viscosity of the aqueous solution prepared from 1.0% of the emulsion at room temperature is less than 25.0 mPas, when the addition amount of the emulsion in the composite brine slurry is 3.0%, the API filtrate loss is less than 5.0mL after 165 ℃/16h high-temperature aging, and is less than 15.0mL after 180 ℃/16h high-temperature aging, compared with the linear polymer with the same monomer proportion, the viscosity effect is reduced (the reduction rate is 33%), and the API filtrate loss in the composite brine slurry after 180 ℃/16h high-temperature aging is less than 70%. The fluid loss additive provided by the invention has good temperature resistance and salt resistance, can be used for a high-temperature high-density drilling fluid system, and can be used for cooperatively controlling the technical problems that the high-temperature high-density drilling fluid rheological property, the fluid loss and the high-temperature suspension stability are difficult to consider, so that safe and efficient drilling is satisfied.
From the above examples, the present invention provides a method for preparing an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid, comprising: and (3) carrying out polymerization reaction on water, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, a RAFT chain transfer agent, a branching agent, a hydrophilic emulsifier, base oil, a lipophilic emulsifier and a persulfate initiator to obtain the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid. The invention also provides an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid and application thereof. The polymer filtrate reducer provided by the invention has good temperature resistance and salt resistance, is convenient to use, has outstanding filtrate reduction effect, and can be widely used for drilling fluid.
While the invention has been described with respect to the preferred embodiments, it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (7)
1. A preparation method of an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid comprises the following steps:
carrying out polymerization reaction on water, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, a RAFT chain transfer agent, a branching agent, a hydrophilic emulsifier, base oil, a lipophilic emulsifier and a persulfate initiator to obtain an inverse emulsion hyperbranched polymer filtrate reducer for drilling fluid;
the RAFT chain transfer agent is selected from isobutyl xanthate;
the mass ratio of the water to the 2-acrylamide-2-methylpropanesulfonic acid to the acrylamide to the RAFT chain transfer agent to the branching agent to the hydrophilic emulsifier to the base oil to the lipophilic emulsifier to the persulfate initiator is (204-225): (61.6 to 78.86): (63.4 to 81.14): (0.125-0.32): (0.1875 to 0.5): (1.224-1.8): (136-150): (11.016-16.2): (0.25 to 0.32);
the kinematic viscosity of the base oil at 40 ℃ is 1.5 mPas-3.0 mPas;
the preparation method of the reverse emulsion hyperbranched polymer filtrate reducer for the drilling fluid comprises the following steps:
mixing water, 2-acrylamide-2-methylpropanesulfonic acid, part of acrylamide, a RAFT chain transfer agent, part of branching agent, persulfate initiator and hydrophilic emulsifier to obtain a water phase material;
mixing base oil and a lipophilic emulsifier to obtain an oil phase material;
mixing the water phase material and the oil phase material, emulsifying, reacting for 2-4 hours, dropwise adding the rest acrylamide and the rest branching agent, and continuously reacting for 3-5 hours to obtain the reverse emulsion hyperbranched polymer filtrate reducer for drilling fluid;
and after the aqueous phase material is obtained, regulating the pH value of the aqueous phase material to 9-11.
2. The method of claim 1, wherein the branching agent is selected from one of N, N-methylenebisacrylamide or polyethylene glycol dimethacrylate.
3. The method of claim 1, wherein the hydrophilic emulsifier is selected from tween 80 or tween 60.
4. The method of claim 1, wherein the lipophilic emulsifier is selected from span 80 or span 60.
5. The method of claim 1, wherein the persulfate initiator is selected from the group consisting of potassium persulfate and ammonium persulfate.
6. An inverse emulsion hyperbranched polymer fluid loss additive for drilling fluids prepared by the method of claim 1.
7. A drilling fluid comprising the inverse emulsion hyperbranched polymer fluid loss additive for a drilling fluid of claim 6.
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| CN115449017B (en) * | 2022-10-09 | 2023-08-15 | 山东诺尔生物科技有限公司 | Star polymer filtrate reducer and preparation method thereof |
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| CN109666464A (en) * | 2017-10-17 | 2019-04-23 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid closure type polymer filtrate reducer and preparation method thereof and drilling fluid |
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| US5789349A (en) * | 1996-03-13 | 1998-08-04 | M-I Drilling Fluids, L.L.C. | Water-based drilling fluids with high temperature fluid loss control additive |
| CN109666464A (en) * | 2017-10-17 | 2019-04-23 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid closure type polymer filtrate reducer and preparation method thereof and drilling fluid |
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