CN111807527A - Strontium-barium scale inhibitor for oil field water treatment and preparation method thereof - Google Patents
Strontium-barium scale inhibitor for oil field water treatment and preparation method thereof Download PDFInfo
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- CN111807527A CN111807527A CN202010616640.0A CN202010616640A CN111807527A CN 111807527 A CN111807527 A CN 111807527A CN 202010616640 A CN202010616640 A CN 202010616640A CN 111807527 A CN111807527 A CN 111807527A
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- strontium
- scale inhibitor
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- 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
- C02F5/14—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 phosphorus
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- 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
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Abstract
The invention discloses a strontium barium scale inhibitor for oil field water treatment. The scale inhibitor comprises the following effective components in percentage by weight: 10-20% of diethylenetriamine pentamethylene phosphonic acid, 10-15% of polyalcohol phosphate, 5-15% of ethylenediamine tetramethylene phosphonic acid, 2-5% of alkylphenol polyoxyethylene ether and the balance of water. The strontium scale inhibitor has good temperature resistance, wide applicable pH range, excellent scale inhibition effect on the deposition of insoluble salts such as calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate and the like in water, good dispersibility and wide application in high-temperature and high-strontium-barium-content oilfield water injection systems.
Description
Technical Field
The invention relates to a strontium-barium scale inhibitor for oil field water treatment and a preparation method thereof, belonging to the technical field of oil field water treatment.
Background
As most oil fields in China enter the water injection oil extraction stage, the scaling problem of an oil extraction and gathering system is increasingly prominent. Scaling is a huge hazard to oil fields, and scaling can be deposited in oil extraction and gathering systems to increase the resistance to fluid flow, thereby increasing energy consumption; secondly, under-deposit corrosion can be caused to influence normal production; scale may also deposit below the formation and may also cause plugging of formation channels.
The main scale types in oil field exploitation include calcium carbonate scale, calcium sulfate scale, strontium carbonate and barium scale, strontium sulfate and barium scale, etc. The research on the scaling of calcium carbonate and calcium sulfate at home and abroad is more, and an effective method is formed, but the scaling problem of barium carbonate, strontium carbonate, barium sulfate and strontium sulfate which are specific to oil fields is still in the research stage at present. In the published patents at present, patent CN 102167451a discloses a composite scale inhibitor prepared from polyepoxysuccinic acid sodium, polyaspartic acid sodium, polymaleic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, and hexamethylenediamine tetramethylpotassium phosphate, wherein the scale inhibition rate is above 90% at 50 ℃; patent CN 101735786A discloses an antiscaling agent prepared from terpolymer and polyepoxysuccinic acid in Ba2+The scale inhibition rate is close to 100% when the concentration is 500mg/L, but the performance of the scale inhibitors is not ideal when the concentration of barium ions is higher under the condition of high temperature, and the performance of inhibiting the scales of barium strontium sulfate and barium strontium carbonate under the influence of the pH range of field water quality is not very outstanding. Patent CN 104370379 discloses a high temperature scale inhibitor prepared from bis 1,6 hexylene triamine pentamethylene phosphonic acid, phosphino acrylic acid multipolymer and polyepoxy sulfocarboxylic acid, but the scale inhibitor is applied to a high temperature water-in-oil system.
Therefore, it is necessary to develop a high-efficiency scale inhibitor for oil fields, which is resistant to the scaling problem of barium strontium ions and has a wider pH range, so as to prevent barium strontium scaling in gathering and transportation systems and equipment, thereby ensuring smooth exploitation of oil fields and improving the economic benefit of oil development.
Disclosure of Invention
Aiming at the defects of the prior art and aiming at inhibiting the strontium barium scaling in the current oilfield exploitation, the invention provides a preparation method of an oilfield scale inhibitor aiming at the problem of the strontium barium ion scaling, which not only has good strontium barium scale inhibition performance in a wider pH value range and at high temperature, but also has obvious scale inhibition performance under the condition of high barium ion content, is convenient, safe and durable to use, is a practical and long-acting scale inhibitor, greatly prolongs the service life of oilfield production equipment, and has greater social and economic benefits.
The invention relates to a strontium-barium scale inhibitor for oil field water treatment, which comprises the following effective components in percentage by weight:
the invention also provides a preparation method of the strontium barium scale inhibitor for oil field water treatment, which comprises the following steps:
adding diethylene triamine pentamethylene phosphonic acid and polyhydric alcohol phosphate in sequence according to the mass percentage of the components, stirring uniformly, adding ethylene diamine tetramethylene phosphonic acid, stirring for 0.4-0.6h, adding a certain amount of water, finally adding alkylphenol polyoxyethylene, and continuing stirring for 15-30 min to obtain the product. -
The invention further provides the application of the strontium barium scale inhibitor for the oil field in an oil field water injection system, the scale inhibitor has a scale inhibition effect on insoluble salts such as barium sulfate, strontium sulfate and the like in the oil field water injection system, and the adding amount is 40-60 mg/L.
The oilfield scale inhibitor provided by the invention has the following advantages:
the diethylenetriamine pentamethylene phosphonic acid can inhibit the generation of carbonate and sulfate scales, has better scale inhibition performance than other organic phosphines in alkaline environment and high temperature, has unique scale inhibition dispersion effect on barium sulfate and strontium sulfate in water, is particularly suitable for oilfield flooding containing barium carbonate, and produces synergistic effect when being compounded with other medicaments, and has good compatibility. The structural formula is as follows:
the polyol phosphate also has excellent scale inhibition effect on the deposition of insoluble salts such as calcium carbonate, calcium sulfate and the like in water, and has a cathodic protection effect on steel. Meanwhile, the compound has a synergistic interaction effect with ethylenediamine tetramethylene phosphine, and has a good inhibition effect on the deposition of barium sulfate and strontium sulfate.
Structural formula (xvi):
the alkylphenol ethoxylates reduces the surface tension of the oil-water interface, so that the medicament can effectively diffuse into the water phase, and the anti-scaling effect of other components is promoted.
The oil field scale inhibitor provided by the invention aims at the scaling problem of strontium barium sulfate in an oil field, has good temperature resistance, maintains more than 90% of scale inhibition rate at the temperature below 80 ℃, and has good inhibition effect on common strontium and barium sulfate, strontium carbonate and barium carbonate in the oil field. Meanwhile, the water-soluble salt-tolerant demulsifier has good salt tolerance and demulsifier compatibility, and is very suitable for the water environment of an oil field.
Drawings
FIG. 1 is a comparison graph of the inhibition performance of barium sulfate scale inhibitor under different concentrations.
FIG. 2 shows different BaCl of the strontium barium scale inhibitor2.2H2Comparison graph of barium sulfate scale inhibition performance under O concentration.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
Preparing a scale inhibitor: preparing a strontium barium scale inhibitor suitable for oil field water treatment according to the component proportion, sequentially adding 18.4 g of diethylenetriamine pentamethylene phosphonic acid and 10.0 g of polyhydric alcohol phosphate, uniformly stirring, adding 14.0 g of ethylenediamine tetramethylene phosphonic acid, stirring for half an hour, adding a certain amount of water, finally adding 2.0 g of alkylphenol polyoxyethylene, and continuously stirring for 20 minutes to obtain the strontium barium scale inhibitor ZF-01 for the oil field.
Example 2
Preparing a scale inhibitor: preparing a strontium barium scale inhibitor suitable for oil field water treatment according to the component proportion, sequentially adding 17.6 g of diethylenetriamine pentamethylene phosphonic acid and 10.7 g of polyhydric alcohol phosphate, uniformly stirring, adding 13.7 g of ethylenediamine tetramethylene phosphonic acid, stirring for half an hour, adding a certain amount of water, finally adding 2.5 g of alkylphenol polyoxyethylene, and continuously stirring for 20 minutes to obtain the strontium barium scale inhibitor ZF-02 for the oil field.
Example 3
Preparing a scale inhibitor: preparing a strontium barium scale inhibitor suitable for oil field water treatment according to the component ratio, sequentially adding 16.0 g of diethylenetriamine pentamethylene phosphonic acid and 12.1 g of polyhydric alcohol phosphate, uniformly stirring, adding 13.0 g of ethylenediamine tetramethylene phosphonic acid, stirring for half an hour, adding a certain amount of water, finally adding 3.3 g of alkylphenol polyoxyethylene, and continuously stirring for 20 minutes to obtain the strontium barium scale inhibitor ZF-03 for the oil field.
Comparative example 1
Preparing a scale inhibitor: sequentially adding 20.0 g of polyhydric alcohol phosphate and 20 g of ethylenediamine tetramethylene phosphonic acid, stirring, adding a certain amount of water, finally adding 5.0 g of alkylphenol polyoxyethylene, and continuously stirring for 20 minutes to obtain the strontium barium scale inhibitor ZF-04 for the oil field.
The anti-scaling performance of the scale inhibitor on barium sulfate scale under different dosing concentrations is evaluated according to an indoor static evaluation method in SY/T5673-93 evaluation method of the performance of the scale inhibitor for oil fields. Concentration gradient experiments of 10ppm, 20ppm, 30ppm, 40ppm, 50ppm and 60ppm of added concentration are respectively carried out on ZF-01, ZF-02, ZF-03 and ZF-04 and the existing strontium barium scale inhibitor, wherein BaCl is2.2H2The O concentration was 500mg/L and the experimental temperature was 50 ℃. The barium sulfate scale inhibition performance data of the scale inhibitor at different concentrations are shown in table 1, and a trend chart is shown in fig. 1.
TABLE 1 barium sulfate Scale inhibition Performance of Scale inhibitors at different concentrations
Under the same dosing concentration, the scale inhibitor is respectively subjected to a static scale inhibition test for inhibiting barium sulfate under different temperature conditions, the dosing concentration is 50mg/L, and BaCl is added2.2H2The O concentration was 500 mg/L. The results of the experiments are shown in the table below。
TABLE 2 comparison of the performance of the scale inhibitor in inhibiting barium sulfate at different temperatures
Under the same dosing concentration, static scale inhibition tests aiming at different barium ion concentrations are respectively carried out, the dosing concentration is 50mg/L, the test temperature is 50 ℃, the scale inhibition effect test result is shown in the following table 3, and the scale inhibition performance is shown in a comparison graph of fig. 2.
TABLE 3 static antiscale test results of different barium ion concentrations at the same dosing concentration
Claims (3)
1. The strontium-barium scale inhibitor for oil field water treatment is characterized by comprising the following effective components in percentage by weight:
the balance of water.
2. The preparation method of the barium strontium scale inhibitor of claim 1, which is characterized by comprising the following steps:
sequentially adding diethylenetriamine pentamethylene phosphonic acid and polyhydric alcohol phosphate according to the mass percentage of the components, uniformly stirring, adding ethylenediamine tetramethylene phosphonic acid, stirring for 0.4-0.6h, adding water, finally adding alkylphenol polyoxyethylene, and continuously stirring for 15-30 min to obtain the strontium barium scale inhibitor.
3. The application of the strontium barium scale inhibitor of claim 1 in oilfield water injection systems, wherein the dosage of the strontium barium scale inhibitor is 40-60 mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115746812A (en) * | 2022-11-30 | 2023-03-07 | 陕西延长石油（集团）有限责任公司 | Barium-strontium scale solid scale inhibitor capable of being rapidly detected and preparation method and application thereof |
Citations (5)
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| CN102897926A (en) * | 2012-08-29 | 2013-01-30 | 仙桃市中楚化工有限责任公司 | Barium-strontium scale inhibiting agent |
| CN104370379A (en) * | 2014-10-17 | 2015-02-25 | 中国海洋石油总公司 | Anti-scale agent for water-in-oil system in oilfield high-temperature environment as well as preparation method and use of anti-scale agent |
| CN105060515A (en) * | 2015-06-30 | 2015-11-18 | 苏州佑君环境科技有限公司 | Scale inhibitor for preventing deposition of barium and strontium scales, and preparation method thereof |
| CN105692931A (en) * | 2014-11-24 | 2016-06-22 | 何猛 | Polyaspartic acid-diethylenetriamine pentamethylene phosphonic acid compound scale inhibitor |
| US20200048990A1 (en) * | 2018-08-13 | 2020-02-13 | Saudi Arabian Oil Company | Systems and Methods for Treating Fluids in Oilfield Facilities |
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2020
- 2020-06-30 CN CN202010616640.0A patent/CN111807527A/en active Pending
Patent Citations (5)
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| CN102897926A (en) * | 2012-08-29 | 2013-01-30 | 仙桃市中楚化工有限责任公司 | Barium-strontium scale inhibiting agent |
| CN104370379A (en) * | 2014-10-17 | 2015-02-25 | 中国海洋石油总公司 | Anti-scale agent for water-in-oil system in oilfield high-temperature environment as well as preparation method and use of anti-scale agent |
| CN105692931A (en) * | 2014-11-24 | 2016-06-22 | 何猛 | Polyaspartic acid-diethylenetriamine pentamethylene phosphonic acid compound scale inhibitor |
| CN105060515A (en) * | 2015-06-30 | 2015-11-18 | 苏州佑君环境科技有限公司 | Scale inhibitor for preventing deposition of barium and strontium scales, and preparation method thereof |
| US20200048990A1 (en) * | 2018-08-13 | 2020-02-13 | Saudi Arabian Oil Company | Systems and Methods for Treating Fluids in Oilfield Facilities |
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| 祁鲁梁等: "《水处理工艺与运行管理实用手册》", 31 May 2002, 中国石化出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115746812A (en) * | 2022-11-30 | 2023-03-07 | 陕西延长石油（集团）有限责任公司 | Barium-strontium scale solid scale inhibitor capable of being rapidly detected and preparation method and application thereof |
| CN115746812B (en) * | 2022-11-30 | 2023-09-29 | 陕西延长石油（集团）有限责任公司 | Barium strontium scale solid scale inhibitor capable of being rapidly detected and preparation method and application thereof |
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