CN108751446B - An environmentally friendly multifunctional scale inhibitor and its preparation method and application - Google Patents
An environmentally friendly multifunctional scale inhibitor and its preparation method and application Download PDFInfo
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- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- DVEKCXOJTLDBFE-UHFFFAOYSA-N n-dodecyl-n,n-dimethylglycinate Chemical compound CCCCCCCCCCCC[N+](C)(C)CC([O-])=O DVEKCXOJTLDBFE-UHFFFAOYSA-N 0.000 claims abstract description 27
- -1 dimethyl betaine Chemical compound 0.000 claims abstract description 24
- 229920001577 copolymer Polymers 0.000 claims abstract description 23
- 229920005615 natural polymer Polymers 0.000 claims abstract description 21
- 239000002738 chelating agent Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000002332 oil field water Substances 0.000 claims abstract description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 19
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 19
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 13
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 12
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 9
- 229920000058 polyacrylate Polymers 0.000 claims description 7
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims description 7
- 229920000805 Polyaspartic acid Polymers 0.000 claims description 5
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims description 5
- 108010064470 polyaspartate Proteins 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims description 4
- 229920001661 Chitosan Polymers 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 229920006027 ternary co-polymer Polymers 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 229920001732 Lignosulfonate Polymers 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 claims description 3
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 claims description 3
- 229920001897 terpolymer Polymers 0.000 claims description 3
- 229920006029 tetra-polymer Polymers 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 abstract description 24
- 230000005764 inhibitory process Effects 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 9
- 239000001506 calcium phosphate Substances 0.000 abstract description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 abstract description 2
- 235000011010 calcium phosphates Nutrition 0.000 abstract description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 abstract description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 abstract 2
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 abstract 1
- 229960003237 betaine Drugs 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 17
- 239000003921 oil Substances 0.000 description 17
- 229910000019 calcium carbonate Inorganic materials 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 229910052788 barium Inorganic materials 0.000 description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003138 coordinated effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polymerisation Methods In General (AREA)
Abstract
本发明提供一种环保型多功能阻垢剂，由如下重量百分比的原料组成：无磷螯合剂45‑70%，天然聚合物3‑10%，结垢抑制剂5‑15%，十二烷基二甲基甜菜碱0.3‑1%，聚六亚甲基胍盐酸盐0.1‑0.5%，余量为水，其中，所述结垢抑制剂为磺酸类共聚物、马来酸酐类共聚物中的至少一种。同时，本发明还提供所述阻垢剂的制备方法和应用。本发明提供的阻垢剂，十二烷基二甲基甜菜碱、聚六亚甲基胍盐酸盐微量添加，对阻垢起协调增效作用，最终制备的阻垢剂，对碳酸钙、磷酸钙、硫酸钡三种垢都有显著的阻垢效果，能够有效解决油田水结垢、堵塞问题；配方无磷，对环境无污染、环保。The invention provides an environment-friendly multifunctional scale inhibitor, which is composed of the following raw materials by weight percentage: 45-70% of phosphorus-free chelating agent, 3-10% of natural polymer, 5-15% of scale inhibitor, dodecane base dimethyl betaine 0.3-1%, polyhexamethylene guanidine hydrochloride 0.1-0.5%, the balance is water, wherein, the scaling inhibitor is a sulfonic acid copolymer, a maleic anhydride copolymer at least one of them. Meanwhile, the present invention also provides the preparation method and application of the scale inhibitor. In the scale inhibitor provided by the invention, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are added in trace amounts to coordinate and synergize the scale inhibition. The three scales of calcium phosphate and barium sulfate have significant scale inhibition effect, which can effectively solve the problem of scaling and blockage in oilfield water; the formula is phosphorus-free, which is environmentally friendly and environmentally friendly.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an environment-friendly multifunctional scale inhibitor, and a preparation method and application thereof.
Background
In the oil field development and secondary oil extraction process, the energy of the oil layer is continuously consumed, so that the pressure of the oil layer is continuously reduced, underground crude oil is greatly degassed, the viscosity is increased, the yield of an oil well is greatly reduced, the oil field must be injected with water in order to maintain or improve the pressure of the oil layer and obtain higher recovery ratio, and the oil field water is generally reinjected in order to save water resources. In addition, in the process of oil field exploitation, oil-gas well fracturing is a production increasing measure, and the purposes of increasing production and increasing injection are achieved by improving the flow conductivity of an oil layer.
However, the oilfield reinjection water, the fracturing water and the formation water contain different scale forming ions such as calcium, magnesium, strontium, barium and the like, and due to thermodynamic instability and chemical incompatibility of water, the scale forming ions interact to generate unstable and easily precipitated substances such as barium sulfate (strontium), calcium carbonate, calcium sulfate and the like. The deposits are accumulated on the surfaces of an oil casing and various devices and can form scale, the problems that an oil well pump is blocked, an annular space between a well pipe and an oil pumping rod is blocked, the inner diameter of a gathering and transportation pipeline is reduced sharply, the devices and the stratum are seriously blocked and the like can be caused frequently, the normal operation of oil field production is greatly influenced, and the production stop of an oil-gas well can be caused even in serious cases.
The existing scale mainly comprises carbonate scale and sulfate scale, the carbonate scale is easy to remove by acidification, but the sulfate scale, especially barium sulfate scale, is difficult to remove by a common method. Currently, scale inhibitors applied to oil fields generally have narrow trial range, most of scale inhibitors only aim at single type scales, and the research on scale inhibitors capable of simultaneously and efficiently blocking three scales of calcium carbonate scale, calcium sulfate scale and barium sulfate scale is very few, and the scale inhibitors also have the problems of weak scale prevention capability, poor scale inhibition effect and environmental pollution. Therefore, the development of an environment-friendly, low-toxicity and high-efficiency multifunctional scale inhibitor is attracting more and more attention.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an environment-friendly multifunctional scale inhibitor, a preparation method and an application thereof.
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight:
45-70% of a phosphorus-free chelating agent, 3-10% of a natural polymer, 5-15% of a scale inhibitor, 0.3-1% of dodecyl dimethyl betaine, 0.1-0.5% of polyhexamethylene guanidine hydrochloride and the balance of water, wherein the scale inhibitor is at least one of a sulfonic acid copolymer and a maleic anhydride copolymer.
Preferably, the phosphorus-free chelating agent comprises polyepoxysuccinic acid and at least one of polyacrylic acid, polyaspartic acid or hydrolyzed polymaleic anhydride; the ratio between the components is any ratio.
Preferably, the natural polymer is at least one of lignosulfonate, chitosan, carboxymethyl starch, carboxymethyl cellulose.
Preferably, the sulfonic acid copolymer is any one or two of acrylic acid/2-acrylamide-2-methylpropanesulfonic acid binary copolymer, acrylic acid/2-acrylamide-2-methylpropanesulfonic acid/hydroxypropyl acrylate terpolymer, acrylic acid/methacrylic acid/2-acrylamide-2-methylpropanesulfonic acid ternary copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid/methyl acrylate ternary copolymer.
Preferably, the maleic anhydride copolymer is any one or two of maleic anhydride/vinyl acetate/acrylic acid terpolymer, propyl acrylate/maleic anhydride/methyl acrylate terpolymer or maleic anhydride/acrylic acid/acrylamide/sodium methallylsulfonate tetrapolymer.
When the natural polymer, the sulfonic acid copolymer and the maleic anhydride copolymer are non-single components, the proportion of the components is any proportion.
The preparation method of the environment-friendly multifunctional scale inhibitor comprises the following steps: adding water, a phosphorus-free chelating agent, a natural polymer, a scale inhibitor, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride into a reaction device in sequence, and then stirring and reacting for 1-3h at 30-40 ℃.
The application of the environment-friendly multifunctional scale inhibitor is to apply the environment-friendly multifunctional scale inhibitor to the technical field of oil field water treatment, and the usage amount is 50-100 mg/L.
The invention has the advantages that:
the scale inhibitor provided by the invention is added in trace amounts with dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride, has a coordinated and synergistic effect on scale inhibition, and has a remarkable scale inhibition effect on three scales of calcium carbonate, calcium phosphate and barium sulfate, wherein the scale inhibition rate of calcium carbonate scale is more than 96.5%, the scale inhibition rate of calcium sulfate scale is more than 97.5%, and the scale inhibition rate of barium sulfate scale is more than 95.0%, so that the scale formation and blockage problems of oil field water can be effectively solved; the formula is phosphorus-free, and has no pollution to the environment and environmental protection.
Detailed description of the preferred embodiments
Example 1
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight: 65% of phosphorus-free chelating agent, 10% of natural polymer, 5% of scale inhibitor, 0.3% of dodecyl dimethyl betaine, 0.1% of polyhexamethylene guanidine hydrochloride and 19.6% of water; wherein the phosphorus-free chelating agent is a mixture of polyepoxysuccinic acid and polyacrylic acid in a mass ratio of 11: 2; the natural polymer is lignosulfonate; the scale inhibitor is a sulfonic acid copolymer, in particular an acrylic acid/2-acrylamide-2-methylpropanesulfonic acid binary copolymer;
the preparation method of the environment-friendly multifunctional scale inhibitor comprises the following steps: adding water, a phosphorus-free chelating agent, a natural polymer, a scale inhibitor, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride into a reaction kettle in sequence, and then stirring and reacting for 3 hours at the temperature of 30 ℃ to obtain the product.
Example 2
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight: 45% of phosphorus-free chelating agent, 10% of natural polymer, 10% of scale inhibitor, 1% of dodecyl dimethyl betaine, 0.1% of polyhexamethylene guanidine hydrochloride and 33.9% of water; wherein the phosphorus-free chelating agent is a mixture of polyepoxysuccinic acid and polyaspartic acid in a mass ratio of 4: 5; the natural polymer is chitosan; the scale inhibitor is maleic anhydride copolymer, in particular maleic anhydride/vinyl acetate/acrylic acid terpolymer sulfonic acid copolymer.
The preparation method is the same as example 1.
Example 3
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight: 70% of phosphorus-free chelating agent, 3% of natural polymer, 15% of scale inhibitor, 0.5% of dodecyl dimethyl betaine, 0.5% of polyhexamethylene guanidine hydrochloride and 11% of water; wherein the phosphorus-free chelating agent is a mixture of polyepoxysuccinic acid and hydrolyzed polymaleic anhydride in a mass ratio of 8: 2; the natural polymer is carboxymethyl starch; the scale inhibitor is a sulfonic acid copolymer, in particular to an acrylic acid/2-acrylamide-2-methylpropanesulfonic acid/hydroxypropyl acrylate terpolymer.
The preparation method is the same as example 1.
Comparative example 1
The procedure of example 1 was repeated except that dodecyl dimethyl betaine was not contained and the water content was 19.9%.
Comparative example 2
The procedure is as in example 1 except that polyhexamethyleneguanidine hydrochloride is not contained and the water content is 19.7%.
Comparative example 3
The procedure is as in example 1 except that dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are not contained and the water content is 20%.
Comparative example 4
The procedure is as in example 2 except that dodecyl dimethyl betaine is not contained and the water content is 34.9%.
Comparative example 5
The procedure is as in example 2 except that polyhexamethyleneguanidine hydrochloride is not contained and the water content is 34%.
Comparative example 6
The procedure is as in example 2 except that dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are not contained and the water content is 35%.
Comparative example 7
The procedure is as in example 3 except that dodecyl dimethyl betaine is not contained and the water content is 11.5%.
Comparative example 8
The procedure is as in example 3 except polyhexamethyleneguanidine hydrochloride is not contained and the water content is 11.5%.
Comparative example 9
The procedure is as in example 3 except that dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are not contained and the water content is 12%.
Detection of Scale inhibition Effect
A water sample to be treated: oil field reinjection water and formation water are both taken from a certain oil field in northern Shaanxi and are mixed according to the volume ratio of 1:1, and the specific water quality is shown in Table 1;
TABLE 1 Water quality analysis results (mg/L) of Water samples to be treated
The scale inhibitors provided in examples 1 to 3 and comparative examples 1 to 9 were added to a sample of water to be treated at an amount of 50 mg/L, stirred, left at 50. + -. 1 ℃ for 24 hours, and then the concentrations of calcium, barium and ion in the sample were measured to calculate the scale inhibition rates of calcium carbonate scale, calcium sulfate scale and barium sulfate scale, and the results are shown in Table 2.
TABLE 2 results of scale inhibition rates (%)
As can be seen from table 2, the scale inhibitors prepared in examples 1 to 3 can simultaneously inhibit calcium carbonate scale, calcium sulfate scale and barium sulfate scale, and have significant scale inhibition effect; meanwhile, the addition of the dodecyl dimethyl betaine and the polyhexamethylene guanidine hydrochloride has a synergistic effect on scale inhibition.
Example 4
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight: 60% of phosphorus-free chelating agent, 8% of natural polymer, 10% of scale inhibitor, 0.5% of dodecyl dimethyl betaine, 0.5% of polyhexamethylene guanidine hydrochloride and 21% of water; wherein the phosphorus-free chelating agent is a mixture of polyepoxysuccinic acid, polyaspartic acid and hydrolyzed polymaleic anhydride with equal mass; the natural polymer is a mixture of carboxymethyl cellulose and carboxymethyl starch with equal mass; the scale inhibitor is a mixture of a sulfonic acid copolymer and a maleic anhydride copolymer, and specifically is a mixture of 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid/methyl acrylate terpolymer and a propyl acrylate/maleic anhydride/methyl acrylate terpolymer which are equal in mass;
the preparation method of the environment-friendly multifunctional scale inhibitor comprises the following steps: adding water, a phosphorus-free chelating agent, a natural polymer, a scale inhibitor, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride into a reaction kettle in sequence, and then stirring and reacting for 1h at 40 ℃.
Comparative example 10
The same procedure as in example 4 was repeated except that dodecyl dimethyl betaine was not contained and the water content was 21.5%.
Comparative example 11
The procedure is as in example 4 except that polyhexamethyleneguanidine hydrochloride is not contained and the water content is 21.5%.
Comparative example 12
The procedure is as in example 4 except that dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are not contained and the water content is 22%.
Detection of Scale inhibition Effect
A water sample to be treated: the water for the oil field fracturing fluid and the formation water are both taken from a certain oil field in northern Shaanxi and are mixed according to the volume ratio of 1:1, and the specific water quality is shown in Table 3;
TABLE 3 Water quality analysis results (mg/L) of Water samples to be treated
The scale inhibitor provided in example 4 and comparative examples 10 to 12 was added to a water sample to be treated at an amount of 100mg/L, stirred, and left at 50. + -. 1 ℃ for 24 hours, and then the concentrations of calcium, barium and ion in the water sample were measured to calculate the scale inhibition rates of calcium carbonate scale, calcium sulfate scale and barium sulfate scale, and the results are shown in Table 4.
TABLE 4 results of scale inhibition rates (%)
As can be seen from table 4, the scale inhibitor prepared in example 4 can inhibit calcium carbonate scale, calcium sulfate scale and barium sulfate scale simultaneously, and has a significant scale inhibition effect; meanwhile, the addition of the dodecyl dimethyl betaine and the polyhexamethylene guanidine hydrochloride has a synergistic effect on scale inhibition.
Example 5
An environment-friendly multifunctional scale inhibitor is prepared from the following raw materials in percentage by weight: 55% of phosphorus-free chelating agent, 5% of natural polymer, 15% of scale inhibitor, 0.3% of dodecyl dimethyl betaine, 0.2% of polyhexamethylene guanidine hydrochloride and 24.5% of water; wherein the phosphorus-free chelating agent is a mixture of polyepoxysuccinic acid, polyacrylic acid, polyaspartic acid and hydrolyzed polymaleic anhydride in a mass ratio of 7:2:4: 3; the natural polymer is chitosan; the scale inhibitor is a mixture of a sulfonic acid copolymer and a maleic anhydride copolymer, and specifically is a mixture of acrylic acid/2-acrylamide-2-methylpropanesulfonic acid/hydroxypropyl acrylate, acrylic acid/methacrylic acid/2-acrylamide-2-methylpropanesulfonic acid, and maleic anhydride/acrylic acid/acrylamide/sodium methallylsulfonate in a mass ratio of 3:3: 4;
the preparation method of the environment-friendly multifunctional scale inhibitor comprises the following steps: adding water, a phosphorus-free chelating agent, a natural polymer, a scale inhibitor, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride into a reaction kettle in sequence, and then stirring and reacting for 2 hours at 35 ℃.
Comparative example 13
The same procedure as in example 5 was repeated except that dodecyl dimethyl betaine was not contained and the water content was 24.8%.
Comparative example 14
The procedure is as in example 5 except that polyhexamethyleneguanidine hydrochloride is not contained and the water content is 24.7%.
Comparative example 15
The procedure is as in example 5 except that dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride are not contained and the water content is 25%.
Detection of Scale inhibition Effect
A water sample to be treated: the oil field water is taken from a certain oil field in northern Shaanxi, and the specific water quality is shown in Table 5;
TABLE 5 Water quality analysis results (mg/L) of Water samples to be treated
The scale inhibitor provided in example 5 and comparative examples 13 to 15 was added to a water sample to be treated at an amount of 75mg/L, stirred, and left at 50. + -. 1 ℃ for 24 hours, and then the concentrations of calcium, barium and ion in the water sample were measured to calculate the scale inhibition rates of calcium carbonate scale, calcium sulfate scale and barium sulfate scale, and the results are shown in Table 6.
TABLE 6 results of scale inhibition rates (%)
As can be seen from table 6, the scale inhibitor prepared in example 5 can simultaneously inhibit calcium carbonate scale, calcium sulfate scale and barium sulfate scale, and has a significant scale inhibition effect; meanwhile, the addition of the dodecyl dimethyl betaine and the polyhexamethylene guanidine hydrochloride has a synergistic effect on scale inhibition.
Claims (3)
1. An environment-friendly multifunctional scale inhibitor is characterized in that: the composite material consists of the following raw materials in percentage by weight:
45-70% of a phosphorus-free chelating agent, 3-10% of a natural polymer, 5-15% of a scale inhibitor, 0.3-1% of dodecyl dimethyl betaine, 0.1-0.5% of polyhexamethylene guanidine hydrochloride and the balance of water, wherein the scale inhibitor is at least one of a sulfonic acid copolymer and a maleic anhydride copolymer;
wherein the sulfonic acid copolymer is any one or any two of acrylic acid/2-acrylamide-2-methylpropanesulfonic acid binary copolymer, acrylic acid/2-acrylamide-2-methylpropanesulfonic acid/hydroxypropyl acrylate terpolymer, acrylic acid/methacrylic acid/2-acrylamide-2-methylpropanesulfonic acid ternary copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid/methyl acrylate ternary copolymer;
wherein the maleic anhydride copolymer is any one or two of maleic anhydride/vinyl acetate/acrylic acid terpolymer, propyl acrylate/maleic anhydride/methyl acrylate terpolymer or maleic anhydride/acrylic acid/acrylamide/sodium methallylsulfonate tetrapolymer;
the phosphorus-free chelating agent comprises polyepoxysuccinic acid and at least one of polyacrylic acid, polyaspartic acid or hydrolyzed polymaleic anhydride;
the natural polymer is at least one of lignosulfonate, chitosan, carboxymethyl starch and carboxymethyl cellulose.
2. The preparation method of the environment-friendly multifunctional scale inhibitor of claim 1 is characterized in that: the preparation method comprises the following steps: adding water, a phosphorus-free chelating agent, a natural polymer, a scale inhibitor, dodecyl dimethyl betaine and polyhexamethylene guanidine hydrochloride into a reaction device in sequence, and then stirring and reacting for 1-3h at 30-40 ℃.
3. The application of the environment-friendly multifunctional scale inhibitor belongs to the technical field of oil field water treatment, the usage amount of the environment-friendly multifunctional scale inhibitor is 50-100mg/L, and the environment-friendly multifunctional scale inhibitor is the scale inhibitor in claim 1.
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| CN109231509A (en) * | 2018-11-15 | 2019-01-18 | 山东泰和水处理科技股份有限公司 | A kind of scale inhibitor for salt manufacture and its application |
| CN111137991B (en) * | 2020-03-23 | 2022-04-22 | 克拉玛依翎昊科技有限责任公司 | Corrosion and scale inhibition bactericide and application thereof |
| CN113045096B (en) * | 2021-03-30 | 2022-08-02 | 上海有江化工有限公司 | Crystallization inhibitor and preparation method and application thereof |
| CN114106803A (en) * | 2021-11-24 | 2022-03-01 | 克拉玛依新科澳石油天然气技术股份有限公司 | Oil well slow-speed descaling antiscaling agent and preparation and use methods thereof |
| CN117566925B (en) * | 2023-12-12 | 2024-05-17 | 北京宝莱尔科技有限公司 | Concentrated solution scale inhibitor |
| CN117776418B (en) * | 2023-12-29 | 2024-07-05 | 陕西金标实业有限公司 | Neutral Gao Wenyi salt-resistant scale inhibitor and preparation method and application thereof |
| CN117946561B (en) * | 2024-03-26 | 2024-06-11 | 安徽海螺制剂工程技术有限公司 | Preparation method of hydrolyzed polymaleic anhydride betaine for scale and corrosion inhibitor |
| CN119143928A (en) * | 2024-11-21 | 2024-12-17 | 新疆克拉玛依市采丰实业有限责任公司 | A calcium carbonate scale inhibitor for oil and gas field injection and its preparation method |
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