CN114685712A - Phosphonic acid group-containing polymer viscosity reducer and preparation method thereof - Google Patents

Phosphonic acid group-containing polymer viscosity reducer and preparation method thereof Download PDF

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CN114685712A
CN114685712A CN202011558806.4A CN202011558806A CN114685712A CN 114685712 A CN114685712 A CN 114685712A CN 202011558806 A CN202011558806 A CN 202011558806A CN 114685712 A CN114685712 A CN 114685712A
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acid group
monomer
phosphonic acid
structural unit
viscosity reducer
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孙举
孟丽艳
苏雪霞
徐生婧
梁庆磊
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Sinopec Oilfield Service Corp
Sinopec Zhongyuan Petroleum Engineering Co Ltd
Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
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Sinopec Oilfield Service Corp
Sinopec Zhongyuan Petroleum Engineering Co Ltd
Drilling Engineering Technology Research Institute of Sinopec Zhongyuan Petroleum Engineering Co Ltd
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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
    • 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
    • C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
    • 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
    • C08F228/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur
    • C08F228/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur by a bond to sulfur
    • C—CHEMISTRY; METALLURGY
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
    • C08F230/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
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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
    • C09K8/03—Specific additives for general use in well-drilling compositions
    • C09K8/035—Organic additives

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Abstract

The invention provides a phosphonic acid group-containing polymer viscosity reducer, which comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II); wherein R is1And R2Each independently is H or C1～C5Straight or branched alkyl of R3Is C1～C5Linear or branched alkylene groups of (a). The organic phosphonic acid polymer contains both phosphonic acid groups and sulfonic acid groups, has strong salt resistance and high-valence metal ion resistance, and can be used in fresh water drilling fluid and calcium chloride composite salt water drilling fluidThe viscosity-reducing effect is still good after high-temperature aging; and the polymer aqueous solution has higher viscosity retention rate through salt resistance evaluation and calcium resistance evaluation. The viscosity reducer of the organic phosphonic acid polymer has good temperature resistance and viscosity reduction and better salt resistance and calcium resistance. The polymer viscosity reducer has the advantages of few reaction raw materials and simple synthesis process.

Description

Phosphonic acid group-containing polymer viscosity reducer and preparation method thereof
Technical Field
The invention relates to the technical field of treating agents for oilfield drilling fluids, in particular to a phosphonic acid group-containing polymer viscosity reducer and a preparation method thereof.
Background
In the drilling process, the viscosity reducer plays an important role in reducing the viscosity and the shear force of the drilling fluid, controlling the rheological property of the drilling fluid and improving the drilling speed.
In the drilling process of deep wells and ultra-deep wells, due to the influences of clay high-temperature dispersion, organic high-molecular compound high-temperature degradation, high-temperature crosslinking of a treating agent and the like, the rheological property of the drilling fluid is poor. In the early days, viscosity reducer products such as inorganic phosphate, tannin, iron complex lignosulfonate FCLS and the like are generally adopted. However, these products have insufficient temperature resistance, and some products even contain components harmful to human bodies and the environment, and have been limited in use. In the last 90 s, a series of research works were carried out on the high-temperature resistant drilling fluid viscosity reducer for the requirement of ultra-deep well drilling, and the research works mainly focus on the synthetic polymers such as acrylic acid, vinyl sulfonic acid and the like and organic phosphates.
CN 103665263B-a phosphonic acid group-containing polymer and application thereof, and a phosphonic acid group-containing polymer drilling fluid viscosity reducer have a good high-temperature viscosity reduction effect in drilling fluid, but the related organic phosphonic acid monomer is 2-acrylamido-2-methyl propyl phosphonic Acid (AMPP), and documents report that the synthesis process of the monomer is difficult, the total yield of the synthesis reaction is low, about 60%, the cost is high, and the industrial production is difficult. Therefore, the viscosity reducer taking the phosphonic acid monomer as the raw material is only in an indoor research stage at present, and is limited in field popularization and application. CN104312548B A phosphorus-containing high temperature resistant drilling fluid viscosity reducer and a preparation method thereof are obtained by free radical copolymerization of a carboxyl-containing monomer A, a sulfonic acid group-containing monomer B, a phosphorus-containing compound C and a cationic monomer D according to a certain mass ratio. Inorganic phosphate is used as the end capping of the polymer in the raw material, and the content of introduced phosphorus element is very limited, so that the improvement of the salt calcium resistance of the polymer is limited.
Therefore, the viscosity reducer which has wide synthetic raw materials and simple process, has good viscosity reduction effect in the calcium bentonite-based slurry and the calcium chloride composite salt water-based slurry under the high-temperature condition and improves the rheological property of the drilling fluid is very necessary.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a phosphonic acid group-containing polymer viscosity reducer, which has a good viscosity reduction effect and can improve the rheological property of drilling fluid.
The invention provides a phosphonic acid group-containing polymer viscosity reducer, which comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II);
Figure BDA0002859658730000021
wherein R is1And R2Each independently is H or C1～C5Straight or branched alkyl of R3Is C1～C8Linear or branched alkylene groups of (1). M is hydrogen or an alkali metal element.
Preferably, the ratio of the mole number of the structural unit shown in the formula (I) to the mole number of the structural unit shown in the formula (II) is 20-65: 35-80.
Preferably, the phosphonic acid group-containing polymer viscosity reducer is a polymer containing a structural unit of a phosphonic acid group and a structural unit of a sulfonic acid group.
The invention provides a preparation method of a phosphonic acid group-containing polymer viscosity reducer, which comprises the following steps:
carrying out polymerization reaction on an isopropenylphosphoric acid monomer A and a monomer B containing a sulfonic acid group in the presence of an initiator and a molecular weight regulator to obtain the product;
the monomer B containing sulfonic acid group is selected from one or more of 2-acrylamide-2-methyl propane sulfonic acid, sodium Vinyl Sulfonate (VSA), sodium styrene sulfonate or sodium allyl sulfonate.
Preferably, the mole ratio of the isopropenylphosphonic acid monomer to the monomer containing the sulfonic acid group is (0.2-0.65): (0.35-0.8).
Preferably, the total mass concentration of the isopropenylphosphonic acid monomer A and the sulfonic acid group-containing monomer B is 20-50%.
Preferably, the initiator is selected from any one of ammonium persulfate or potassium persulfate;
the mass of the initiator is 1.5-5% of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer.
Preferably, the molecular weight regulator is selected from one or more of mercaptoacetic acid or isopropanol;
the mass of the molecular weight regulator is 0.1-4% of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer.
Preferably, the temperature of the polymerization reaction is 75-100 ℃; the polymerization reaction time is 1 to 5 hours.
Preferably, the polymerization reaction further comprises: and (3) adjusting the pH value of the reaction product to 7.5-9 by using sodium hydroxide to obtain a viscous product, and drying and crushing the viscous product to obtain the phosphonic acid group-containing polymer viscosity reducer.
Compared with the prior art, the invention provides a phosphonic acid group-containing polymer viscosity reducer, which comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II); wherein R is1And R2Each independently is H or C1～C5Straight or branched alkyl of R3Is C1～C5Linear or branched alkylene groups of (1). The organic phosphonic acid polymer contains both phosphonic acid groups and sulfonic acid groups, and has stronger performanceThe salt resistance and high-valence metal ion resistance of the polymer can ensure that the polymer containing organic phosphonic acid still has good viscosity reduction effect after high-temperature aging in fresh water drilling fluid and composite salt water drilling fluid; and the polymer aqueous solution has higher viscosity retention rate through salt resistance evaluation and calcium resistance evaluation. The viscosity reducer of the organic phosphonic acid polymer has good temperature resistance and viscosity reduction and better salt resistance and calcium resistance. The polymer viscosity reducer has the advantages of few reaction raw materials and simple synthesis process.
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FIG. 1 is an infrared spectrum analysis chart of a copolymer viscosity reducer of isopropenylphosphonic acid and 2-acrylamido-2-methylpropanesulfonic acid (AMPS/IPPA) prepared in example 1 of the present invention.
Detailed Description
The invention provides a phosphonic acid group-containing polymer viscosity reducer and a preparation method thereof, and a person skilled in the art can realize the viscosity reducer by appropriately improving process parameters by referring to the content. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
In the synthesis of high-performance drilling fluid treating agent products, monomers containing sulfonic acid groups and phosphonic acid groups can be used as main raw materials for providing strong hydration groups, and the sulfonic acid groups and the phosphonic acid groups are not sensitive to salts and can react with Ca2+、Mg2+High valence metal ions have stronger chelation at high temperature, and the salt resistance, especially the calcium and magnesium resistance, of the product can be obviously improved. And saturated bonds such as C-C, C-P and the like in molecules are formed, so that the temperature resistance of the polymer is greatly enhanced. The high-temperature resistant viscosity reducer disclosed by the invention simultaneously introduces sulfonic acid groups and phosphonic acid groups, and is favorable for improving the temperature resistance and the salt calcium resistance.
The invention provides a phosphonic acid group-containing polymer viscosity reducer, which comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II);
Figure BDA0002859658730000041
wherein R is1And R2Each independently is H or C1～C5Linear or branched alkyl of (a); specific examples include, but are not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-pentyl;
R3is C1～C5Linear or branched alkylene of (a); specific examples include, but are not limited to: methylene, ethylene, propylene, isopropylene, butylene, pentylene.
M is hydrogen or an alkali metal element. The metal element can be any one or more of Li, Na and K.
The phosphonic acid group-containing polymer viscosity reducer is specifically a polymer containing a structural unit of a phosphonic acid group and a structural unit of a sulfonic acid group.
The ratio of the mole number of the structural unit shown in the formula (I) to the mole number of the structural unit shown in the formula (II) is preferably 20-65: 35-80; more preferably 22-63: 37-78; including but not limited to 20:80, 35:65, 50:50, 65:35, 25: 75.
The invention provides a preparation method of a phosphonic acid group-containing polymer viscosity reducer, which comprises the following steps:
the polymer is prepared by carrying out polymerization reaction on an isopropenylphosphoric acid monomer A and a monomer B containing a sulfonic acid group in the presence of an initiator and a molecular weight regulator.
The preparation method preferably comprises the following steps:
the method comprises the following steps of (1) mixing an isopropenylphosphonic acid monomer A and a sulfonic acid group-containing monomer B in a mass ratio of (0.2-0.65): (0.35-0.8) mixing and dissolving to prepare an aqueous solution.
The propylene phosphate monomer is IPPA, which is not limited in the present invention and is well known to those skilled in the art.
Isopropenylphosphonic acid, an organic phosphineAnd (4) acid. Phosphonic acid polymers have excellent calcium resistance and better temperature and salt resistance relative to sulfonate polymers, and the excellent properties are mainly based on phosphonic acid groups: the organic phosphonic acid is generally an organic phosphonic acid having a C-P bond structure, which is a strong electron ligand having a phosphine-oxygen double bond (P ═ O), and can react with Ca2+、Mg2+、Al3 +The plasma forms a strong chelating structure which is not easy to damage at high temperature, and the high-valence metal ion salt of the organic phosphonic acid generally has good water solubility, and can be prevented from being separated out in an aqueous solution to a great extent, so that the tolerance capability of the drilling fluid treating agent to the high-valence metal ions can be improved. Compared with the sulfonic acid monomer commonly used in the drilling fluid treating agent, the phosphonic acid monomer has stronger C-P bond than C-S bond, the strength of the phosphonic acid monomer is equivalent to that of the C-C bond, and the C-P bond has strong oxidation resistance and hydrolysis resistance and is even more stable than the C-C bond in this respect. Theoretically, the polymer material formed by the polymerization reaction of the phosphonic acid monomer is applied to the drilling fluid treating agent, and has better salt calcium resistance and higher applicable temperature.
The monomer B containing sulfonic acid groups is selected from one or more of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS), sodium Vinylsulfonate (VSA), sodium Styrene Sulfonate (SSA) or sodium allylsulfonate (ASA). In the present invention, the source of the monomer is not limited and may be commercially available.
The mole ratio of the isopropenylphosphonic acid monomer to the monomer containing the sulfonic acid group is preferably (0.2-0.65): (0.35-0.8).
Such ratios include, but are not limited to, 0.2:0.8, 0.35:0.65, 0.5:0.5, 0.65:0.35, 0.25: 0.75.
The total mass concentration of the isopropenylphosphonic acid monomer A and the sulfonic acid group-containing monomer B is preferably 20-50%. In particular, it may be 20%, 25%, 30%, 40%, 50%, or a point value between any two of the above.
Dissolving initiator in 1.5-5 wt% of the isopropenylphosphonic acid monomer and the sulfonic acid group containing monomer in clear water.
The initiator is selected from any one of ammonium persulfate or potassium persulfate; the mass of the initiator is preferably 1 to 5 percent of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer; specifically, it may be 1%, 2%, 3%, 4%, 5%, or a point value between any two of the above.
Dissolving a molecular weight regulator accounting for 0.1-4 percent of the total mass of the monomer mixture into water, adding the mixture into a reaction system, and heating to 50-70 ℃; the above temperature is the starting temperature.
The molecular weight regulator is selected from one or more of mercaptoacetic acid or isopropanol;
the mass of the molecular weight regulator is preferably 0.1-4% of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer, and specifically can be 0.1%, 0.5%, 1%, 1.5%, 2%, 3%, 4%; or a point value between any of the above.
Then, adding the reaction monomer aqueous solution into a reaction container, adding an initiator aqueous solution into a reaction system, heating the system to 75-100 ℃, and carrying out polymerization reaction for 1-5 hours.
After the polymerization reaction is finished, adjusting the pH value of the reaction product to 7.5-9 by using sodium hydroxide to obtain a viscous product, and drying and crushing the viscous product to obtain the organic phosphonic acid polymer viscosity reducer.
In addition, the invention also provides an evaluation method and evaluation performance of the organic phosphonic acid polymer viscosity reducer.
The invention provides a phosphonic acid group-containing polymer viscosity reducer, which comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II); wherein R is1And R2Each independently is H or C1～C5Straight or branched alkyl of R3Is C1～C5Linear or branched alkylene groups of (a).
The invention has the beneficial effects that: 1) the organic phosphonic acid polymer contains phosphonic acid groups,
And sulfonic acid groups have stronger salt resistance and high-valence metal ion resistance, so that the organic phosphonic acid-containing polymer still has a better viscosity reduction effect after being aged at high temperature in fresh water drilling fluid and composite salt water drilling fluid; and the polymer aqueous solution has higher viscosity retention rate through salt resistance evaluation and calcium resistance evaluation. The viscosity reducer of the organic phosphonic acid polymer has good temperature resistance and viscosity reduction and better salt resistance and calcium resistance. 2) The polymer viscosity reducer adopts two reaction raw materials, has a simple synthesis process, wherein isopropenylphosphonic acid (IPPA) is the most representative structure in an organic phosphonic acid monomer, and can be used for remarkably reflecting the excellent performance of the phosphonic acid monomer, interference factors in a molecular structure are few, the analysis of the influence factors is convenient, the synthesis process is mature, the purity and the yield are high, and the pilot production yield reaches more than 95%, so that the research on the organic phosphoric acid polymer has good economic benefit and is easy to popularize on a large scale.
In order to further illustrate the present invention, the following will describe in detail a phosphonic acid group-containing polymer viscosity reducer and a preparation method thereof provided by the present invention with reference to examples.
Example 1
Mixing isopropenylphosphonic acid (IPPA) and 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) according to the mass ratio of 35% to 65% to prepare a monomer mixture aqueous solution with the mass fraction of 30%, adding Isopropanol (IPA) accounting for 1% of the total mass of the monomer mixture into the monomer mixture aqueous solution, and heating to 60 ℃. Then dissolving potassium persulfate accounting for 1.5 percent of the total mass of the monomers in clear water, adding the solution into a reaction system, heating the system to 75 ℃ for reaction for 5 hours, adjusting the pH value to 8 by using sodium hydroxide after the reaction is finished to obtain slightly viscous liquid, and drying and crushing the liquid to obtain the viscosity reducer containing organic phosphoric acid.
Examples 2 to 8
According to the method of example 1, preparing the organic phosphonic acid polymer viscosity reducer respectively; the different formulations and conditions are shown in table 1:
TABLE 1 amounts of substances and reaction conditions for polymerization in examples 2 to 9
Figure BDA0002859658730000071
Comparative example 1
Mixing Acrylic Acid (AA) and 2-acrylamide-2-methyl propanesulfonic Acid (AMPS) according to the mass ratio of 15% to 85% to prepare a monomer mixture aqueous solution with the mass fraction of 30%, adding Isopropanol (IPA) accounting for 1% of the total mass of the monomer mixture into the monomer mixture aqueous solution, and heating to 65 ℃. And then dissolving potassium persulfate accounting for 1.5 percent of the total mass of the monomers in clear water, adding the solution into a reaction system, heating the system to 90 ℃ for reaction for 1 hour, adjusting the pH value to 8 by using sodium hydroxide after the reaction is finished to obtain viscous liquid, and drying and crushing the viscous liquid to obtain the reference drilling fluid viscosity reducer.
The products obtained in the above examples and comparative examples were evaluated for apparent viscosity and fluid loss reduction, and the base slurry and method for evaluation were as follows:
(1) preparation of base slurry
Calcium-based bentonite-based slurry: 1000mL of water was added with 100g of calcium bentonite and 5g of anhydrous Na2CO3Stirring at high speed (10000 rpm, the same below) for 20min, and curing at 25 deg.C for 24h to obtain the final product.
Calcium chloride composite saline water-based slurry: adding 40g of sodium chloride, 5g of calcium chloride and 3g of anhydrous sodium carbonate into 1000mL of bentonite-based slurry with volume fraction of 10%, stirring at high speed for 20min, and weighting with barite until the density is 1.4g/cm3And obtaining the composite saline water-based slurry.
(2) Testing the fluid loss and viscosity reduction rate of the drilling fluid:
respectively adding the prepared drilling fluid viscosity reducer into the three base slurries, stirring at a high speed for 5min, respectively rolling and aging at 200 ℃ for 16h, then stirring at a high speed of 25 ℃ for 5min, measuring rheological parameters of the drilling fluid by using a six-speed rotary viscometer, and measuring the filtration loss of the drilling fluid by using a drilling fluid loss instrument. Calculating the viscosity reduction rate D of the base slurry by taking the base slurry as a reference, wherein the larger the viscosity reduction rate is, the stronger the viscosity reduction capability of the drilling fluid viscosity reducer is:
Figure BDA0002859658730000081
in the formula: (phi 100)0Is the reading of the base pulp at a rotational speed of 100 revolutions per minute of the rotational viscometer; φ 100 is the reading of the base slurry at 100 revolutions per minute of a rotational viscometer after addition of the drilling fluid viscosity reducer and aging for 16 hours at 200 ℃. The amount of drilling fluid viscosity reducer added and the results are shown in table 2.
TABLE 2 Performance of polymeric viscosity reducers in various baseslurries
Figure BDA0002859658730000082
As can be seen from the table above, the phosphonic acid group-containing polymer viscosity reducer shows remarkable viscosity reduction effect after being aged at a high temperature of 200 ℃ in bentonite fresh water drilling fluid and calcium chloride composite salt water drilling fluid, shows good temperature resistance, salt resistance and calcium resistance, and has a result superior to that of the binary copolymer drilling fluid viscosity reducer of 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid in the comparative example. Therefore, the phosphonic acid group-containing polymer drilling fluid viscosity reducer provided by the invention has better temperature resistance, salt resistance, especially calcium resistance, and is very suitable for deep well drilling and high-pressure stratum drilling.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A phosphonic acid group-containing polymer viscosity reducer comprises a structural unit shown in a formula (I) and a structural unit shown in a formula (II);
Figure FDA0002859658720000011
wherein R is1And R2Each independently is H or C1～C5Straight or branched alkyl of R3Is C1～C8Linear or branched alkylene groups of (1).
2. The phosphonic acid group-containing polymer according to claim 1, wherein the ratio of the number of moles of the structural unit represented by formula (I) to the number of moles of the structural unit represented by formula (II) is 20 to 65:35 to 80.
3. The phosphonic acid group-containing polymer according to claim 1, which is specifically a polymer of a structural unit containing a phosphonic acid group and a structural unit containing a sulfonic acid group.
4. The preparation method of the phosphonic acid group-containing polymer viscosity reducer is characterized by comprising the following steps:
carrying out polymerization reaction on an isopropenylphosphoric acid monomer A and a monomer B containing a sulfonic acid group in the presence of an initiator and a molecular weight regulator to obtain the product;
the monomer B containing sulfonic acid group is selected from one or more of 2-acrylamide-2-methyl propane sulfonic acid, sodium Vinyl Sulfonate (VSA), sodium styrene sulfonate or sodium allyl sulfonate.
5. The preparation method according to claim 4, wherein the molar ratio of the isopropenylphosphonic acid monomer to the sulfonic acid group-containing monomer is (0.2-0.65): (0.35-0.8).
6. The preparation method according to claim 4, wherein the total mass concentration of the isopropenylphosphonic acid monomer A and the sulfonic acid group-containing monomer B is 20-50%.
7. The production method according to claim 4, wherein the initiator is selected from any one of ammonium persulfate or potassium persulfate;
the mass of the initiator is 1.5-5% of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer.
8. The preparation method according to claim 4, wherein the molecular weight regulator is selected from one or more of mercaptoacetic acid or isopropanol;
the mass of the molecular weight regulator is 0.1-4% of the total mass of the isopropenylphosphonic acid monomer and the sulfonic acid group-containing monomer.
9. The method according to claim 4, wherein the polymerization reaction temperature is 75 ℃ to 100 ℃; the polymerization time is 1-5 hours.
10. The method of claim 4, further comprising, after the polymerization: and (3) adjusting the pH value of the reaction product to 7.5-9 by using sodium hydroxide to obtain a viscous product, and drying and crushing the viscous product to obtain the phosphonic acid group-containing polymer viscosity reducer.
CN202011558806.4A 2020-12-25 2020-12-25 Phosphonic acid group-containing polymer viscosity reducer and preparation method thereof Pending CN114685712A (en)

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US6395853B1 (en) * 1999-06-10 2002-05-28 Clariant Gmbh Water-soluble copolymers and their use for exploration and production of petroleum and natural gas
CN102899006A (en) * 2012-09-20 2013-01-30 中国石油化工股份有限公司 Phosphonic acid group-containing polymer drilling fluid viscosity reducer and preparation method thereof

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