CN112409534A - Cation auxiliary agent for treating oilfield produced water and preparation method thereof - Google Patents
Cation auxiliary agent for treating oilfield produced water and preparation method thereof Download PDFInfo
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- CN112409534A CN112409534A CN202011351497.3A CN202011351497A CN112409534A CN 112409534 A CN112409534 A CN 112409534A CN 202011351497 A CN202011351497 A CN 202011351497A CN 112409534 A CN112409534 A CN 112409534A
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- cationic
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- oilfield produced
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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
- C08F220/56—Acrylamide; Methacrylamide
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical 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
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to a cation auxiliary agent for treating oil field produced water. Mainly solves the problems of multiple types of additives, high proportion and high toxicity of the existing cationic polyacrylamide products in reaction aqueous solution. The method is characterized in that: the components and the mixture ratio are as follows by weight percent: the two monomers comprise a monomer A and a monomer B; 8% -20% of a monomer A; 7% -19% of a monomer B; 0.05-5.0ppm of solubilizer; 0.1-5 ppm of complexing agent; 0.015% -0.36% of composite initiator; the balance of water; the invention also provides a preparation method of the cationic auxiliary agent, which comprises the following steps: weighing a monomer, and adding desalted water and a solubilizer to obtain a monomer aqueous solution; adding a complexing agent into the monomer aqueous solution; after the deoxidization is completed, adding a composite initiator in proportion to prepare a colorless and semitransparent cationic assistant colloid; and drying, grinding and screening to obtain the white solid powder of the cationic assistant. The cationic assistant product has high purity, no toxicity, less species and low dosage, can treat suspended matters in water drive water of an oil field, and can also be used for a sludge dewatering experiment.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a cationic additive for treating oilfield produced liquid and a preparation method thereof.
Background
After the oil field produced liquid is subjected to electric oil-water separation, a large amount of suspended impurities exist in the water and are influenced by polymer flooding and ternary combination flooding, the produced water contains more and more polymers, emulsified oil and suspended impurities, the sludge produced in the later period is higher in oil content, and the dehydration difficulty is increased.
The existing cationic assistant for oil fields mainly aims at the action mechanisms of water-flooding produced water and sludge concentration treatment, namely bridging and sweeping mechanisms, and charge adsorption and electric neutralization action mechanisms, so that the flocculation performance and the sludge dewatering performance are improved. Aiming at the cationic assistant of the system, the copolymerization product of acrylamide and cationic monomer can play a good role in flocculation and sludge dewatering, wherein the effect is related to the cationic monomer content of the copolymerization product and the curling degree of the copolymerized molecules in the solution. Among them, cationic monomers are various, but not many cationic additives are used for copolymerization production and are added to industrial production.
The existing cationic assistant is mainly a cationic polyacrylamide product used for sewage and sludge treatment, and is prepared by copolymerizing or modifying Acrylamide (AM) in an aqueous solution. For example, patents publication nos. CN101353392A and CN102603970B have certain disadvantages, such as:
1. the additive in the reaction aqueous solution has a plurality of types, has high proportion (accounting for 0.05-1.5 percent of the total amount of the monomer) and remains in the product;
2. part of the additives have high toxicity and are not suitable for production; for example: chain regulators such as diethylenetriamine, triethylenediamine, etc.
3. The reaction needs an ultraviolet light source, and needs to be improved in the aspect of industrial production process;
4. the reaction requires adjustment of the pH.
Disclosure of Invention
The invention aims to solve the problems of multiple types of additives and high proportion and high toxicity of cationic polyacrylamide products for sewage and sludge treatment in a reaction aqueous solution in the background technology, and provides the cationic additive for the water treatment of the oilfield produced water, which has the advantages of high product purity, no toxicity, no harm, less types and low dosage, can treat suspended matters in water drive water of the oilfield, can perform sludge dewatering experiments, and meets the production requirements of the oilfield. The invention also provides a preparation method of the cationic assistant for treating the oilfield produced water.
The invention can solve the problems by the following technical scheme: the cation auxiliary agent for treating the oilfield produced water comprises the following components in percentage by weight: the two monomers comprise a monomer A and a monomer B; 8% -20% of a monomer A; 7% -19% of a monomer B; 0.05-5.0ppm of solubilizer; 0.1-5 ppm of complexing agent; 0.015-0.36% of composite initiator (the composite initiator accounts for 0.05-1.2% of the total mass of the monomers); the balance being water.
The complexing agent is disodium ethylene diamine tetraacetate; the solubilizer is urea.
The monomer A is acrylamide; monomer B is acryloyloxyethyltrimethyl ammonium chloride or dimethyldiallylammonium chloride or methacryloyloxyethyltrimethylammonium chloride.
The composite initiator is a compound of potassium persulfate and sodium sulfite; the mass ratio of the potassium persulfate to the sodium sulfite is 0.5:1-2: 1.
The invention also provides a preparation method of the cation auxiliary agent for treating the oilfield produced water, which comprises the following steps:
firstly, weighing two monomers according to the total mass percentage of the monomers, adding desalted water and a solubilizer, and uniformly stirring until the monomers are completely dissolved to form a monomer aqueous solution;
secondly, adding a complexing agent into the prepared monomer aqueous solution in proportion, and then filling high-purity nitrogen to remove oxygen;
thirdly, after the oxygen is completely removed, adding the composite initiator in proportion, continuously removing the oxygen, then preserving heat, sealing, standing and curing to prepare colorless and semitransparent cationic assistant colloid;
and fourthly, drying, grinding and screening the viscous colloid of the cationic assistant to obtain white solid powder of the cationic assistant.
And the time for filling high-purity nitrogen to remove oxygen in the step 2 is 10-50 min.
And in the step 3, the oxygen removal time is 3-100 minutes. And standing and curing for more than 1 hour in the step 3.
The cation auxiliary agent for treating the oilfield produced water has the effects that the cosolvent is used for increasing the dissolution speed of the product; the complexing agent is used for removing interference of metal ions; the cationic monomer has the functions of increasing the charge density of the product and improving the flocculation effect.
The molecular weight of the cationic assistant product for treating the oil field produced water prepared by the invention is 500-1200 ten thousand controllable, wherein the content of acrylamide monomer (dry basis) is less than or equal to 0.1 percent, and the dissolving time of dry powder is less than or equal to 60 min.
Compared with the background technology, the invention has the following beneficial effects: a
1. The initiation system selected by the invention is a composite initiation system, the dosage of the initiator is less (the minimum reaches 0.01), the initiator is easy to obtain in the market, the initiation temperature is room temperature, other auxiliary initiation facilities are not required to be added in the reaction, and the equipment cost is low.
2. The synthesis needs less kinds of auxiliary agents, the dosage is low (less than 1 ppm), and the residue in the product is less.
3. The ideal cationic assistant can be obtained by room-temperature initiation without additional heat tracing and cooling devices.
The method has the advantages of less types of additives and low dosage in the preparation process, no extra heating and cooling medium is needed in the reaction, the reaction can be completed at room temperature, the requirement on the device is low, and the prepared product has high purity and is non-toxic and harmless.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples:
example 1:
the total amount of the reaction system is 6 tons/kettle.
Firstly, weighing 10026kg of monomer acrylamide and 7973kg of acryloyloxyethyl trimethyl ammonium chloride, dissolving the monomers with desalted water, and uniformly stirring to prepare a monomer aqueous solution with the mass concentration of the total monomers of 30%;
and secondly, adding 180g of urea serving as a solubilizer (about 3 ppm) into the prepared monomer aqueous solution, adding 120g of ethylene diamine tetraacetic acid complexing agent (about 2 ppm), introducing nitrogen to remove oxygen for 45 minutes, adding 18kg of composite initiator (the mass ratio of potassium persulfate to sodium sulfite is 1: 1.2), the using amount of the composite initiator is 0.1 percent of the total mass of the monomers, uniformly stirring, continuously introducing nitrogen for about 20 minutes, and then sealing.
And thirdly, obtaining colorless and transparent cation auxiliary agent colloid through the reaction, and preparing the cation auxiliary agent white solid powder through extrusion granulation, quick drying by a vibration drying bed, grinding and screening, wherein the measured molecular weight is 650 ten thousand, the cationic degree is 12.11%, and the cation auxiliary agent is suitable for oilfield water-drive sewage treatment and sludge dewatering treatment.
Example 2
Firstly, weighing 9424kg of monomer acrylamide and 8576kg of dimethyl diallyl ammonium chloride, dissolving the monomers with desalted water, and uniformly stirring to prepare a monomer water solution with the mass concentration of the total monomer of 30%;
and secondly, adding 120g of urea serving as a solubilizer (about 2 ppm) into the prepared monomer aqueous solution, adding 90g of ethylene diamine tetraacetic acid complexing agent (about 1.5 ppm), introducing nitrogen to remove oxygen for 60 minutes, adding 63kg of composite initiator (the mass ratio of potassium persulfate to sodium sulfite is 1: 1), the using amount of the composite initiator is 0.35 percent of the total mass of the monomers, uniformly stirring, continuously introducing nitrogen for about 30 minutes, and then sealing.
And thirdly, obtaining colorless and transparent cation auxiliary agent colloid through the reaction, and preparing the cation auxiliary agent white solid powder through extrusion granulation, quick drying by a vibration drying bed, grinding and screening, wherein the measured molecular weight is 450 ten thousand, the cationic degree is 28.57%, and the cation auxiliary agent colloid is suitable for oilfield water-drive sewage treatment and sludge dewatering treatment.
Example 3
Firstly, weighing 11671kg of monomer acrylamide and 6329kg of methacryloyloxyethyl trimethyl ammonium chloride, dissolving the monomers with desalted water, and uniformly stirring to prepare a monomer aqueous solution with the mass concentration of the total monomers of 30%; a
And secondly, adding 60g of urea serving as a solubilizer (about 1 ppm) into the prepared monomer aqueous solution, adding 90g of ethylene diamine tetraacetic acid complexing agent (about 1.5 ppm), introducing nitrogen to remove oxygen for 50 minutes, adding 39.6kg of composite initiator (the mass ratio of potassium persulfate to sodium sulfite is 1: 2) with the use amount of 0.22 percent of the total mass of the monomers, uniformly stirring, continuously introducing nitrogen for about 25 minutes, and then sealing.
And thirdly, obtaining colorless and transparent cation auxiliary agent colloid through the reaction, and preparing the cation auxiliary agent white solid powder through extrusion granulation, quick drying by a vibration drying bed, grinding and screening, wherein the measured molecular weight is 550 ten thousand, the cationic degree is 16.67%, and the cation auxiliary agent is suitable for oilfield water-drive sewage treatment and sludge dewatering treatment.
The materials used in the above embodiments are all commercially available, low in price and available directly.
Claims (9)
1. The cation auxiliary agent for treating the oilfield produced water comprises the following components in percentage by weight: the two monomers comprise a monomer A and a monomer B; 8% -20% of a monomer A; 7% -19% of a monomer B; 0.05-5.0ppm of solubilizer; 0.1-5 ppm of complexing agent; 0.015% -0.36% of composite initiator; the balance being water.
2. The cationic additive for oilfield produced water treatment according to claim 1, wherein the cationic additive comprises: the complexing agent is disodium ethylene diamine tetraacetate; the solubilizer is urea.
3. The cationic additive for oilfield produced water treatment according to claim 1, wherein the cationic additive comprises: the monomer A is acrylamide; monomer B is acryloyloxyethyltrimethyl ammonium chloride or dimethyldiallylammonium chloride or methacryloyloxyethyltrimethylammonium chloride.
4. The cationic additive for oilfield produced water treatment according to claim 1, wherein the cationic additive comprises: the composite initiator is two compounds of potassium persulfate and sodium sulfite.
5. The cationic additive for oilfield produced water treatment according to claim 4, wherein the cationic additive comprises: the mass ratio of the potassium persulfate to the sodium sulfite is 0.5:1-2: 1.
6. The preparation method of the cationic assistant for treating oilfield produced water according to claim 1, comprising the following steps:
firstly, weighing two monomers according to the total mass percentage of the monomers, adding desalted water and a solubilizer, and uniformly stirring until the monomers are completely dissolved to form a monomer aqueous solution;
secondly, adding a complexing agent into the prepared monomer aqueous solution in proportion, and then filling high-purity nitrogen to remove oxygen;
thirdly, after the oxygen is completely removed, adding the composite initiator in proportion, continuously removing the oxygen, then preserving heat, sealing, standing and curing to prepare colorless and semitransparent cationic assistant colloid;
and fourthly, drying, grinding and screening the viscous colloid of the cationic assistant to obtain white solid powder of the cationic assistant.
7. The preparation method of the cationic assistant for oilfield produced water treatment according to claim 6, wherein the cationic assistant comprises: standing and curing for more than 1 hour.
8. The preparation method of the cationic assistant for oilfield produced water treatment according to claim 6, wherein the cationic assistant comprises: and (3) filling high-purity nitrogen to remove oxygen for 10-50min in the step (2).
9. The preparation method of the cationic assistant for oilfield produced water treatment according to claim 6, wherein the cationic assistant comprises: in the step 3, the oxygen removal time is 3-100 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011351497.3A CN112409534A (en) | 2020-11-27 | 2020-11-27 | Cation auxiliary agent for treating oilfield produced water and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011351497.3A CN112409534A (en) | 2020-11-27 | 2020-11-27 | Cation auxiliary agent for treating oilfield produced water and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2063656A1 (en) * | 1991-06-10 | 1992-12-11 | Fu Chen | Method of preparing acrylamide/diallyl dimethyl ammonium chloride copolymers |
| CN101050050A (en) * | 2007-03-30 | 2007-10-10 | 重庆大学 | Method for synthesizing sludge dewatering agent of positive ions |
| CN101654498A (en) * | 2009-06-30 | 2010-02-24 | 山东宝莫生物化工股份有限公司 | Method for preparing high molecular weight cationic polyacrylamide employing single-initiator |
| CN102060950A (en) * | 2010-11-22 | 2011-05-18 | 青岛科技大学 | Method for preparing homopolymer and copolymer of dimethyl diallyl ammonium chloride |
| CN102603970A (en) * | 2012-01-13 | 2012-07-25 | 重庆大学 | Preparation method of cationic polyacrylamide |
| CN105199044A (en) * | 2015-11-11 | 2015-12-30 | 重庆城市管理职业学院 | Method for preparing cationic polyacrylamide employing microwave-induced template polymerization |
-
2020
- 2020-11-27 CN CN202011351497.3A patent/CN112409534A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2063656A1 (en) * | 1991-06-10 | 1992-12-11 | Fu Chen | Method of preparing acrylamide/diallyl dimethyl ammonium chloride copolymers |
| CN101050050A (en) * | 2007-03-30 | 2007-10-10 | 重庆大学 | Method for synthesizing sludge dewatering agent of positive ions |
| CN101654498A (en) * | 2009-06-30 | 2010-02-24 | 山东宝莫生物化工股份有限公司 | Method for preparing high molecular weight cationic polyacrylamide employing single-initiator |
| CN102060950A (en) * | 2010-11-22 | 2011-05-18 | 青岛科技大学 | Method for preparing homopolymer and copolymer of dimethyl diallyl ammonium chloride |
| CN102603970A (en) * | 2012-01-13 | 2012-07-25 | 重庆大学 | Preparation method of cationic polyacrylamide |
| CN105199044A (en) * | 2015-11-11 | 2015-12-30 | 重庆城市管理职业学院 | Method for preparing cationic polyacrylamide employing microwave-induced template polymerization |
Non-Patent Citations (2)
| Title |
|---|
| 卢红霞等: "阳离子聚丙烯酰胺P(AM-DMC)的合成与表征", 《高分子材料科学与工程》 * |
| 张跃军等: "几种阳离子度PDA共聚物的合成", 《精细化工》 * |
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Application publication date: 20210226 |