CN118185007A - Barium sulfate scale inhibitor and preparation method and application thereof - Google Patents
Barium sulfate scale inhibitor and preparation method and application thereof Download PDFInfo
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- CN118185007A CN118185007A CN202410351427.XA CN202410351427A CN118185007A CN 118185007 A CN118185007 A CN 118185007A CN 202410351427 A CN202410351427 A CN 202410351427A CN 118185007 A CN118185007 A CN 118185007A
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- barium sulfate
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- cysteine
- taurine
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 title claims abstract description 96
- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XUJNEKJLAYXESH-REOHCLBHSA-N L-Cysteine Chemical compound SC[C@H](N)C(O)=O XUJNEKJLAYXESH-REOHCLBHSA-N 0.000 claims abstract description 92
- XOAAWQZATWQOTB-UHFFFAOYSA-N taurine Chemical compound NCCS(O)(=O)=O XOAAWQZATWQOTB-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000004201 L-cysteine Substances 0.000 claims abstract description 46
- 235000013878 L-cysteine Nutrition 0.000 claims abstract description 46
- 229960003080 taurine Drugs 0.000 claims abstract description 44
- 239000000178 monomer Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 78
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 39
- 239000003513 alkali Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000003999 initiator Substances 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000007334 copolymerization reaction Methods 0.000 claims description 5
- 239000002332 oil field water Substances 0.000 claims description 2
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 abstract description 17
- 229910001379 sodium hypophosphite Inorganic materials 0.000 abstract description 17
- 230000005764 inhibitory process Effects 0.000 abstract description 13
- 229910052788 barium Inorganic materials 0.000 abstract description 5
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract description 5
- 125000003368 amide group Chemical group 0.000 abstract description 4
- 238000006555 catalytic reaction Methods 0.000 abstract description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 2
- 229920000578 graft copolymer Polymers 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 229920001577 copolymer Polymers 0.000 description 12
- 239000008367 deionised water Substances 0.000 description 12
- 229910021641 deionized water Inorganic materials 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000005303 weighing Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 238000000502 dialysis Methods 0.000 description 4
- 238000004108 freeze drying Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- NCPXQVVMIXIKTN-UHFFFAOYSA-N trisodium;phosphite Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])[O-] NCPXQVVMIXIKTN-UHFFFAOYSA-N 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
- 229910001626 barium chloride Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- PWKSKIMOESPYIA-UHFFFAOYSA-N 2-acetamido-3-sulfanylpropanoic acid Chemical compound CC(=O)NC(CS)C(O)=O PWKSKIMOESPYIA-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1092—Polysuccinimides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a barium sulfate scale inhibitor, a preparation method and application thereof, and belongs to the technical field of high polymer materials. The barium sulfate scale inhibitor is obtained by graft copolymerizing taurine monomer and L-cysteine monomer on polysuccinimide. According to the invention, taurine and L-cysteine are taken as monomers, and are respectively graft-copolymerized on polysuccinimide under the catalysis of sodium hypophosphite to obtain the water-soluble graft copolymer barium sulfate scale inhibitor containing carboxyl, amido and sulfonic groups, wherein the inhibition rate of the barium sulfate scale inhibitor on barium sulfate is more than 90%, and the barium scale inhibitor has good barium scale inhibition performance.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a barium sulfate scale inhibitor and a preparation method and application thereof.
Background
With the continuous exploitation of petroleum, most oil fields are currently in the middle and later stages of development. Moreover, formation energy does not meet the normal production of the field, and therefore, it is necessary to manually fill water into the formation to replenish the energy. The oilfield production wastewater can cause serious environmental pollution. Therefore, in actual production, produced water is mostly re-injected into the stratum after being treated by a simple process. The formation water of the oil field contains a large amount of scaling ions, and the water injection component of the oil field is more complex, so that the incompatibility of fluid exists between the injected water and the formation water, and scaling is easily caused by the reaction between incompatible ions. In addition, the temperature, pH value and formation pressure of the oil layer can be changed along with oil extraction, so that the solubility of scale forming anions and cations of formation water is reduced to separate out precipitates.
Oilfield scaling problems present a significant challenge in both economic and technical aspects, and to alleviate this problem, chemical scale inhibitor injection is currently the most prevalent method of oilfield scale retardation or prevention. However, the current commercial scale inhibitor has the problems of poor scale inhibition performance, high cost caused by complex use in application and the like.
Disclosure of Invention
The invention aims to provide a barium sulfate scale inhibitor, and a preparation method and application thereof. The method is used for solving the problems that the prior commercial scale inhibitor has poor scale inhibition performance, and the cost is high due to the need of compounding and use in application.
In a first aspect, the present invention provides a barium sulfate scale inhibitor, which is obtained by graft copolymerizing taurine monomer and L-cysteine monomer on polysuccinimide, and has a structure shown in the following formula (I):
X, Y, Z in the formula (I) is any integer from 1 to 10 independently; for example, X may be 1,2, 3, 4, 5, 6, 7, 8, 9, 10; for example, Y may be 1,2, 3, 4, 5, 6, 7, 8, 9, 10; for example, Z may be 1,2, 3, 4, 5, 6, 7, 8, 9, 10.
In the barium sulfate scale inhibitor provided by the invention, the barium sulfate scale inhibitor is obtained by graft copolymerizing taurine monomer and L-cysteine monomer on polysuccinimide. As the side chain hydrophilic group is introduced on the polysuccinimide, the barium scale inhibition performance of the barium sulfate scale inhibitor can be remarkably improved.
In a second aspect, the invention provides a preparation method of the barium sulfate scale inhibitor, which comprises the following steps:
s1, providing an aqueous polysuccinimide solution, a taurine alkali solution, an L-cysteine alkali solution and an aqueous initiator solution;
s2, dropwise adding a taurine alkali solution, an L-cysteine alkali solution and an initiator aqueous solution into the polysuccinimide aqueous solution, adjusting the pH value of the solution to be alkaline, and carrying out copolymerization reaction to obtain the barium sulfate scale inhibitor.
In some embodiments, in step S1, the molar ratio of polysuccinimide, taurine and L-cysteine is 1 (0.5 to 1.5): (0.5 to 1.5), e.g., may be a ratio of 1:0.5:0.5, 1:1:0.5, 1:1.5:0.5, 1:0.5:1, 1:1:1.5:1, 1:0.5:1.5, 1:1:1.5, 1:1.5:1.5, 1:1.5 or other values within this range.
In some preferred embodiments, the molar ratio of polysuccinimide, taurine and L-cysteine is 1:1:1.
In some embodiments, in step S1, the mass to volume ratio of polysuccinimide to water in the aqueous polysuccinimide solution is 1:3; in the taurine alkali solution, the mass volume ratio of the taurine to the alkali solution is 1:2; in the L-cysteine alkali solution, the mass volume ratio of the L-cysteine to the alkali solution is 1:2; the mass volume ratio of the initiator to the water in the aqueous initiator solution is 1:2, and the addition amount of the initiator is 3-5% of the total mass of polysuccinimide, taurine and L-cysteine, and can be 3%, 3.5%, 4%, 4.5%, 5% or other values in the range.
In some preferred embodiments, the initiator is added in an amount of 4% of the total mass of polysuccinimide, taurine and L-cysteine.
In some embodiments, the alkali solution in the taurine alkali solution and the alkali solution in the L-cysteine alkali solution are all sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 15%.
In some embodiments, in step S2, the dropwise addition time is 0.5 to 1h, for example, may be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1h, or other values within this range; the pH value is 8 to 11, and may be, for example, 8, 8.5, 9, 9.5, 10, 10.5, 11 or other values within this range.
In some embodiments, in step S2, the temperature of the copolymerization reaction is 40-60 ℃, e.g., may be 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, or other values within this range; the time is 4 to 6 hours, and may be, for example, 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours or other values within the range.
In some embodiments, the method further comprises a step of purifying the barium sulfate scale inhibitor obtained in step S2.
In some preferred embodiments, the purification comprises passing the barium sulfate scale inhibitor obtained in step S2 through a 2000Da dialysis membrane and freeze-drying for 48 hours to obtain a purified barium sulfate scale inhibitor.
In a third aspect, the invention provides the use of the barium sulfate scale inhibitor described above in an oilfield water treatment system.
The beneficial effects of the invention are as follows: compared with the prior art, the invention takes taurine and L-cysteine as monomers, and graft-copolymerizes on polysuccinimide under the catalysis of sodium hypophosphite to obtain the water-soluble graft copolymer barium sulfate scale inhibitor containing carboxyl, amido and sulfonic groups, wherein the inhibition rate of the barium sulfate scale inhibitor on barium sulfate is more than 90%, and the barium scale inhibitor has good barium scale inhibition performance.
Drawings
FIG. 1 is an infrared spectrum of a barium sulfate scale inhibitor prepared in example 2 of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The experimental methods for which specific conditions are not specified in the examples are generally commercially available according to conventional conditions and those described in handbooks, or according to conditions recommended by the manufacturer, using general-purpose equipment, materials, reagents, etc., unless otherwise specified.
Example 1
The preparation method of the barium sulfate scale inhibitor comprises the following steps:
S1, adding Polysuccinimide (PSI) and deionized water into a three-necked flask, wherein the mass volume ratio of the polysuccinimide to the deionized water is 1:3, heating to 50 ℃, and uniformly stirring to form a suspension; weighing Sodium Hypophosphite (SHP), and adding deionized water, wherein the mass volume ratio of the sodium hypophosphite to the deionized water is 1:2, so as to obtain sodium phosphite aqueous solution; weighing taurine (Tau) and L-cysteine (L-Cys), and respectively adding into sodium hydroxide solution with the mass concentration of 15%, wherein the mass volume ratio of the taurine to the L-cysteine to the sodium hydroxide solution with the mass concentration of 15% is 1:2, so as to respectively obtain taurine alkali solution and L-cysteine alkali solution;
S2, dropwise adding taurine alkali solution and L-cysteine alkali solution into a three-necked flask, and then dropwise adding sodium hypophosphite solution into the three-necked flask, wherein the dropwise adding time is controlled to be 0.5-1 h; wherein the molar ratio of polysuccinimide to taurine and L-cysteine is 1:0.5:0.5, and the addition amount of sodium hypophosphite is 4% of the total mass of polysuccinimide, taurine and L-cysteine; after the dripping is completed, the pH value of the solution in the three-neck flask is regulated by sodium hydroxide solution with the mass concentration of 15 percent, and the pH value is controlled between 8 and 11; after the pH value in the system solution is stable, carrying out timing reaction for 5 hours, controlling the reaction temperature at 50 ℃, cooling after the reaction is finished to obtain a copolymer solution, dialyzing the copolymer solution in a dialysis bag with the molecular weight of 2000Da to remove unreacted micromolecule monomers, and carrying out freeze drying for 48 hours to obtain the purified water-soluble copolymer barium sulfate scale inhibitor.
Example 2
The preparation method of the barium sulfate scale inhibitor comprises the following steps:
S1, adding Polysuccinimide (PSI) and deionized water into a three-necked flask, wherein the mass volume ratio of the polysuccinimide to the deionized water is 1:3, heating to 50 ℃, and uniformly stirring to form a suspension; weighing Sodium Hypophosphite (SHP), and adding deionized water, wherein the mass volume ratio of the sodium hypophosphite to the deionized water is 1:2, so as to obtain sodium phosphite aqueous solution; weighing taurine (Tau) and L-cysteine (L-Cys), and respectively adding into sodium hydroxide solution with the mass concentration of 15%, wherein the mass volume ratio of the taurine to the L-cysteine to the sodium hydroxide solution with the mass concentration of 15% is 1:2, so as to respectively obtain taurine alkali solution and L-cysteine alkali solution;
S2, dropwise adding taurine alkali solution and L-cysteine alkali solution into a three-necked flask, and then dropwise adding sodium hypophosphite solution into the three-necked flask, wherein the dropwise adding time is controlled to be 0.5-1 h; wherein the molar ratio of polysuccinimide to taurine and L-cysteine is 1:1:1, and the addition amount of sodium hypophosphite is 4% of the total mass of polysuccinimide, taurine and L-cysteine; after the dripping is completed, the pH value of the solution in the three-neck flask is regulated by sodium hydroxide solution with the mass concentration of 15 percent, and the pH value is controlled between 8 and 11; after the pH value in the system solution is stable, carrying out timing reaction for 5 hours, controlling the reaction temperature at 50 ℃, cooling after the reaction is finished to obtain a copolymer solution, dialyzing the copolymer solution in a dialysis bag with the molecular weight of 2000Da to remove unreacted micromolecule monomers, and carrying out freeze drying for 48 hours to obtain the purified water-soluble copolymer barium sulfate scale inhibitor.
The water-soluble copolymer barium sulfate scale inhibitor prepared in this example was subjected to infrared test, and the results are shown in fig. 1.
From FIG. 1, it can be seen that there is a 3403.07cm-1、239.27cm-1、1660cm-1、1597.16cm-1、1399.80cm-1、1192.41cm-1、1048.03cm-1、813.57cm-1、740.99cm-1、527.54cm-1 characteristic absorption peak, where the broad peak at 3403.07cm -1 is caused by the stretching vibration of O-H in the carboxylic acid group and N-H in the amide group; the peak at 1660cm -1 was due to the tensile vibration of c=o in carboxylic acid, and the peak at 1597.16cm -1 was the tensile vibration absorption peak of the amide II band c=o, indicating successful ring opening of PSI; the peak at 1399.80cm -1 is the stretching vibration peak of s=o in the sulfonic acid group, 1192.41cm- 1 is the peak induced by stretching vibration of C-N in the amide group, 1048.03cm -1 is due to vibration of the S-O bond in the sulfonic acid group; the last 813.57cm -1、740.99cm-1、527.54cm-1 peak is due to the vibration of N-H, S-H, C-H, which shows that taurine and L-cysteine have been graft copolymerized onto the polysuccinimide.
Example 3
The preparation method of the barium sulfate scale inhibitor comprises the following steps:
S1, adding Polysuccinimide (PSI) and deionized water into a three-necked flask, wherein the mass volume ratio of the polysuccinimide to the deionized water is 1:3, heating to 60 ℃, and uniformly stirring to form a suspension; weighing Sodium Hypophosphite (SHP), and adding deionized water, wherein the mass volume ratio of the sodium hypophosphite to the deionized water is 1:2, so as to obtain sodium phosphite aqueous solution; weighing taurine (Tau) and L-cysteine (L-Cys), and respectively adding into sodium hydroxide solution with the mass concentration of 15%, wherein the mass volume ratio of the taurine to the L-cysteine to the sodium hydroxide solution with the mass concentration of 15% is 1:2, so as to respectively obtain taurine alkali solution and L-cysteine alkali solution;
S2, dropwise adding taurine alkali solution and L-cysteine alkali solution into a three-necked flask, and then dropwise adding sodium hypophosphite solution into the three-necked flask, wherein the dropwise adding time is controlled to be 0.5-1 h; wherein the molar ratio of polysuccinimide to taurine and L-cysteine is 1:1.5:1.5, and the addition amount of sodium hypophosphite is 4% of the total mass of polysuccinimide, taurine and L-cysteine; after the dripping is completed, the pH value of the solution in the three-neck flask is regulated by sodium hydroxide solution with the mass concentration of 15 percent, and the pH value is controlled between 8 and 11; after the pH value in the system solution is stable, carrying out timing reaction for 6 hours, controlling the reaction temperature at 60 ℃, cooling after the reaction is finished to obtain a copolymer solution, dialyzing the copolymer solution in a dialysis bag with the molecular weight of 2000Da to remove unreacted micromolecule monomers, and carrying out freeze drying for 48 hours to obtain the purified water-soluble copolymer barium sulfate scale inhibitor.
Comparative example
The same amount of polysuccinimide as in example 2 was used directly as a barium sulfate scale inhibitor without grafting treatment.
Evaluation of Scale inhibitor Performance
The copolymer products prepared in examples 1 to 3 and comparative example were tested for scale inhibition properties of barium sulfate by the following specific test methods:
Accurately weighing the 0.5g scale inhibitor, dissolving the scale inhibitor with a small amount of pure water, and transferring the dissolved scale inhibitor into a 250mL volumetric flask for constant volume to obtain a scale inhibitor solution; 200mL of pure water is taken in a 250mL volumetric flask, and a prepared BaCl 2 solution is added to make the content of Ba 2+ be 56 mg.mL -1 of barium chloride solution; accurately adding 3.75mL of the scale inhibitor solution into the barium chloride solution, standing for 10min, and then adding the Na 2SO4 solution prepared in advance while shaking to ensure that the content of SO 4 2- is 41.2 mg.mL -1; then adding pure water to dilute to scale marks, putting into a triangular flask, putting into a water bath with the temperature of 50+/-1 ℃ for constant temperature for half an hour, and standing for 24 hours.
After the reaction was completed, the solution was cooled to room temperature and filtered with quantitative filter paper. The filtrate of BaSO 4 was titrated with ethylenediamine tetraacetic acid (EDTA) standard solution to determine the concentration of Ba 2+. The test results are shown in table 1:
TABLE 1 scale inhibition test results of scale inhibitors prepared in examples 1 to 3 and comparative example
| Sequence number | Dosage of scale inhibitor (mg/L) | Barium sulfate scale inhibition rate |
| Example 1 | 30 | 95％ |
| Example 2 | 30 | 97％ |
| Example 3 | 30 | 91％ |
| Comparative example | 30 | 52％ |
As can be seen from the results of Table 1, compared with the low scale inhibition performance of the scale inhibitor containing only polysuccinimide in the comparative example, the invention takes polysuccinimide, taurine and L-cysteine as raw materials, and the water-soluble copolymer barium sulfate scale inhibitor is obtained through graft copolymerization under the catalysis of the catalyst, has excellent scale inhibition effect on barium sulfate, and has the inhibition rate of 91-97% on barium sulfate when the dosage of the scale inhibitor is 30mg/L, thereby realizing the prevention of the generation of barium sulfate scale in water with higher hardness, high sulfate radical and water quality under lower concentration.
It should be noted that, the foregoing embodiments all belong to the same inventive concept, and the descriptions of the embodiments have emphasis, and where the descriptions of the individual embodiments are not exhaustive, reference may be made to the descriptions of the other embodiments.
The foregoing examples merely illustrate embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A barium sulfate scale inhibitor, characterized in that the scale inhibitor is obtained by graft copolymerizing taurine monomer and L-cysteine monomer on polysuccinimide, and has a structure shown in the following formula (I):
X, Y, Z in the formula (I) are each independently an integer of 1 to 10.
2. The method for preparing the barium sulfate scale inhibitor according to claim 1, comprising the steps of:
s1, providing an aqueous polysuccinimide solution, a taurine alkali solution, an L-cysteine alkali solution and an aqueous initiator solution;
S2, dropwise adding the taurine alkali solution, the L-cysteine alkali solution and the initiator aqueous solution into the polysuccinimide aqueous solution, adjusting the pH value of the solution to be alkaline, and carrying out copolymerization reaction to obtain the barium sulfate scale inhibitor.
3. The method for producing a barium sulfate scale inhibitor according to claim 2, wherein in step S1, the molar ratio of the polysuccinimide, the taurine and the L-cysteine is 1 (0.5 to 1.5): 0.5 to 1.5.
4. The method for producing a barium sulfate scale inhibitor according to claim 3, wherein the molar ratio of the polysuccinimide, the taurine and the L-cysteine is 1:1:1.
5. The method for preparing a barium sulfate scale inhibitor according to claim 2, wherein in the step S1, the mass-to-volume ratio of the polysuccinimide to the water in the polysuccinimide aqueous solution is 1:3;
In the taurine alkali solution, the mass volume ratio of the taurine to the alkali solution is 1:2;
in the L-cysteine alkali solution, the mass volume ratio of the L-cysteine to the alkali solution is 1:2;
In the aqueous solution of the initiator, the mass-to-volume ratio of the initiator to the water is 1:2, and the addition amount of the initiator is 3-5% of the total mass of the polysuccinimide, the taurine and the L-cysteine.
6. The method for producing a barium sulfate scale inhibitor according to claim 5, wherein the initiator is added in an amount of 4% by mass of the total mass of the polysuccinimide, the taurine and the L-cysteine.
7. The method for preparing a barium sulfate scale inhibitor according to claim 5, wherein the alkali solution of taurine alkali and the alkali solution of L-cysteine alkali are sodium hydroxide solution, and the mass concentration of the sodium hydroxide solution is 15%.
8. The method for preparing a barium sulfate scale inhibitor according to claim 2, wherein in the step S2, the dripping time is 0.5-1 h; the pH value is 8-11.
9. The method for preparing a barium sulfate scale inhibitor according to claim 2, wherein in the step S2, the temperature of the copolymerization reaction is 40-60 ℃ for 4-6 hours.
10. Use of the barium sulfate scale inhibitor of claim 1 in an oilfield water treatment system.
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| CN202410351427.XA CN118185007A (en) | 2024-03-26 | 2024-03-26 | Barium sulfate scale inhibitor and preparation method and application thereof |
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| CN202410351427.XA CN118185007A (en) | 2024-03-26 | 2024-03-26 | Barium sulfate scale inhibitor and preparation method and application thereof |
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