CN115725321A - Compound demulsifier for heavy oil field and preparation method thereof - Google Patents
Compound demulsifier for heavy oil field and preparation method thereof Download PDFInfo
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- CN115725321A CN115725321A CN202211488794.1A CN202211488794A CN115725321A CN 115725321 A CN115725321 A CN 115725321A CN 202211488794 A CN202211488794 A CN 202211488794A CN 115725321 A CN115725321 A CN 115725321A
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- 150000001875 compounds Chemical class 0.000 title claims abstract description 39
- 239000000295 fuel oil Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 46
- 229920000570 polyether Polymers 0.000 claims abstract description 46
- -1 phenol amine Chemical class 0.000 claims abstract description 44
- 239000003921 oil Substances 0.000 claims abstract description 30
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 19
- 229920000768 polyamine Polymers 0.000 claims abstract description 19
- 239000012948 isocyanate Substances 0.000 claims abstract description 18
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 18
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 17
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 15
- 150000001767 cationic compounds Chemical class 0.000 claims abstract description 10
- 239000000839 emulsion Substances 0.000 claims abstract description 9
- 239000003849 aromatic solvent Substances 0.000 claims abstract description 8
- 239000003999 initiator Substances 0.000 claims description 14
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 14
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005886 esterification reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 7
- 238000007334 copolymerization reaction Methods 0.000 claims description 7
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical group CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 7
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000007795 chemical reaction product Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 150000003254 radicals Chemical class 0.000 claims description 5
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 4
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 3
- 229960001124 trientine Drugs 0.000 claims description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 2
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 2
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 2
- OCBHHZMJRVXXQK-UHFFFAOYSA-M benzyl-dimethyl-tetradecylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 OCBHHZMJRVXXQK-UHFFFAOYSA-M 0.000 claims description 2
- 229920005606 polypropylene copolymer Polymers 0.000 claims description 2
- 238000010526 radical polymerization reaction Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- SFVFIFLLYFPGHH-UHFFFAOYSA-M stearalkonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 SFVFIFLLYFPGHH-UHFFFAOYSA-M 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 230000018044 dehydration Effects 0.000 abstract description 13
- 238000006297 dehydration reaction Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 239000010779 crude oil Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Polyethers (AREA)
Abstract
The invention discloses a compound demulsifier for a heavy oil field and a preparation method thereof. The demulsifier comprises a demulsifier main agent, a demulsifier auxiliary agent and a cationic compound, wherein the demulsifier main agent comprises: demulsifier auxiliary agent: the mass ratio of the cationic compound is 2-4:1-4:1; the main agent of the demulsifier is obtained by reacting polyamine polyether and phenol amine oil head in an aromatic solvent by adopting an isocyanate crosslinking agent; polyamine-based polyether: phenol amine type oil head: the mass ratio of the aromatic hydrocarbon solvent is 1-5; the isocyanate crosslinking agent accounts for 1.5 to 3.0 percent of the total mass of the polyamine polyether and the phenolic amine oil head; the auxiliary agent of the demulsifier is maleic anhydride modified polyether demulsifier. The demulsifier has the advantages of high dehydration speed in heavy oil products, large final dehydration amount, good dehydrated water quality, and effects of eliminating oil-water interface emulsion and adjusting oil-water interface.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a compound demulsifier for a heavy oil oilfield and a preparation method thereof.
Background
In the process of developing an oil field, due to the existence of a natural surfactant and the introduction of additives, surfactants and the like in the process of developing tertiary oil recovery, the emulsification degree of crude oil emulsion is enhanced, and the demulsification difficulty is increased. The crude oil demulsifier is an important chemical agent in crude oil production, gathering and refining, and mainly has the functions of matching with field process equipment to realize the oil-water separation of crude oil, breaking emulsion in the crude oil, and enabling the treated crude oil to meet the water content index of the crude oil. Among the methods for realizing oil-water separation of crude oil, adding a crude oil demulsifier is a common economic and effective method.
The types of the current demulsifiers mainly comprise an oil-soluble isocyanate crosslinked demulsifier, an oil-soluble acrylic acid esterification copolymerization demulsifier, a water-soluble epichlorohydrin crosslinked demulsifier and the like by modification means. The demulsifiers of different types have different oil-water separation characteristics, wherein the isocyanate crosslinking demulsifier has high dehydration speed and large final dehydration amount in the thickened oil product. The acrylic acid esterification copolymerization demulsifier has strong dehydration capability and good final dehydration capability in medium oil products. The dehydration speed of the epichlorohydrin crosslinking demulsifier in medium and heavy oil products is high. In a thick oil product with high asphaltene and high colloid, the existence of emulsion at an oil-water interface causes incomplete oil-water separation, so that the process flow in the crude oil treatment process is unstable, and the water content index of the treated crude oil is difficult to achieve. In addition, different types of demulsifiers have a good treatment effect on specific oils, but in oil fields with complex oil compositions and more influencing factors, a single type of demulsifier has difficulty in achieving the treatment effect. The conventional demulsifier can hardly meet the requirements of oil-water separation in the aspects of treating dehydration speed, oil-water interface state, dehydrated water quality and the like.
Disclosure of Invention
The invention aims to solve the technical problems and provides a compound demulsifier for a heavy oil field and a preparation method thereof.
In a first aspect, the application provides a compound demulsifier for a heavy oil field, which is realized by adopting the following technical scheme.
The compound demulsifier for the heavy oil field comprises a demulsifier main agent, a demulsifier auxiliary agent and a cationic compound, wherein the demulsifier main agent comprises: demulsifier auxiliary agent: the mass ratio of the cationic compound is 2-4:1-4:1;
the main agent of the demulsifier is obtained by reacting polyamine polyether and phenolic amine oil head in an aromatic hydrocarbon solvent by adopting an isocyanate crosslinking agent; polyamine-based polyether: a phenol amine type oil head: the mass ratio of the aromatic hydrocarbon solvent is 1-5; the isocyanate crosslinking agent accounts for 1.5 to 3.0 percent of the total mass of the polyamine polyether and the phenolic amine oil head;
the auxiliary agent of the demulsifier is maleic anhydride modified polyether demulsifier;
the cationic compound is one or more of dodecyl dimethyl benzyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride and octadecyl dimethyl benzyl ammonium chloride solution, and the concentration of the solution is 40-50%.
Furthermore, the polyamine polyether is a copolymer of propylene oxide and ethylene oxide which takes triethylene tetramine, tetraethylene pentamine or polyethylene polyamine as an initiator.
Furthermore, the mass ratio of the initiator to the propylene oxide is 1.
Further, the phenolic amine type oil head is a copolymer of phenolic amine resin and propylene oxide serving as an initiator.
Furthermore, the mass ratio of the phenolic aldehyde amine resin to the propylene oxide is 1.
Furthermore, the isocyanate crosslinking agent is toluene diisocyanate or diphenylmethane diisocyanate.
Furthermore, the isocyanate crosslinking agent is added in the form of an isocyanate crosslinking agent aromatic hydrocarbon solution, and the mass concentration of the isocyanate crosslinking agent aromatic hydrocarbon solution is 5-20%.
In a second aspect, the application provides a preparation method of a compound demulsifier for a heavy oil field, which is realized by adopting the following technical scheme.
The preparation method of the compound demulsifier for the heavy oil field comprises the following steps:
s1, preparing a main agent of a demulsifier: adding a specified amount of polyamine polyether, a phenolic amine oil head and an aromatic solvent into a reaction kettle, replacing nitrogen, dropwise adding an isocyanate crosslinking agent at 90-100 ℃, continuously reacting for 1-2 hours after dropwise adding is completed within 30-60 minutes, and cooling to below 40 ℃ to discharge;
s2, preparing a demulsifier auxiliary agent: performing mono-esterification reaction on phenolic amine type polyether and maleic anhydride, adding a small molecular double-bond compound, and performing free radical polymerization to obtain a maleic anhydride modified polyether demulsifier;
and S3, uniformly mixing the main agent of the demulsifier prepared in the step S1, the auxiliary agent of the demulsifier prepared in the step S2 and the cationic compound to obtain the compound demulsifier for the thick oil field.
Further, in step S2, the preparation method of the maleic anhydride modified polyether demulsifier is as follows:
a. performing mono-esterification reaction on phenolic aldehyde amine polyether and maleic anhydride under the condition that p-toluenesulfonic acid is used as a catalyst; the mass ratio of the phenolic aldehyde amine polyether to the maleic anhydride is 7.5-15; the mass of the p-toluenesulfonic acid is 0.5-2% of the total mass of the phenol aldehyde amine polyether and the maleic anhydride; the reaction temperature is 80-90 ℃, and the reaction time is 2.5-4 h;
b. adding a solvent and an unsaturated double-bond compound monomer, wherein the adding amount of the unsaturated double-bond compound monomer and the solvent is respectively 2-10% and 70-120% of the mass of the polyether containing the double-bond structure;
c. dropping initiator in the amount of 0.5-2.0 wt% of the total weight of the double bond structure polyether and the unsaturated double bond compound; carrying out free radical copolymerization reaction for 3-4 h at 75-90 ℃, and cooling the reaction product to obtain the demulsifier auxiliary agent.
Furthermore, the phenolic aldehyde amine polyether is a copolymer of phenolic aldehyde amine resin, propylene oxide and ethylene oxide, and the mass ratio of the phenolic aldehyde amine resin to the propylene oxide is 1: 39-129, and the ethylene oxide accounts for 12.5-25% of the total weight of the polyether; the solvent is an aromatic hydrocarbon solvent; the unsaturated double-bond compound is one of acrylic acid, methyl acrylate or methyl methacrylate; the initiator is one of benzoyl peroxide and azobisisobutyronitrile.
The present application has the following advantageous effects.
The compound demulsifier for the heavy oil field has the advantages of high dehydration speed in the heavy oil product, large final dehydration amount and good dehydrated water quality, and can effectively eliminate oil-water interface emulsion and adjust the oil-water interface. The preparation method of the compound demulsifier for the heavy oil field is simple, low in cost, good in using effect and wide in industrial application prospect.
Detailed Description
The present invention will be further described with reference to the following examples.
Preparation example 1
Adding an initiator (one of triethylene tetramine, tetraethylenepentamine, polyethylene polyamine or phenol-aldehyde amine resin) and a catalyst potassium hydroxide into a high-temperature high-pressure synthesis kettle, heating to 90 ℃, vacuumizing, dehydrating and deoxidizing for 20 minutes, heating to 130 ℃, starting to feed propylene oxide, controlling the reaction temperature to be 140 +/-5 ℃, and controlling the reaction pressure to be less than or equal to 0.4MPa; after the reaction is finished, the product is reacted with ethylene oxide, the reaction temperature is controlled to be 130 +/-5 ℃, the reaction pressure is less than or equal to 0.4MPa, and the polyether or polyether oil head is synthesized after the complete reaction. The polyether specifically comprises the following components:
example 1
A preparation method of a compound demulsifier for a heavy oil field comprises the following steps:
1) Preparing a main agent of the demulsifier: adding 50g of polyamine polyether (AP-1), 10g of phenol amine type oil head (FP-1) and 50g of SA-1500 aromatic solvent into a reaction kettle, displacing with nitrogen, heating to 90 ℃, dropwise adding aromatic solution of toluene diisocyanate crosslinking agent (1.8 g of diphenylmethane diisocyanate is dissolved in 10g of heavy aromatic), completing dropwise adding within 60 minutes, continuing to react for 1 hour, cooling to below 40 ℃, and discharging to obtain a main agent A-1 of the demulsifier;
2) Preparing a demulsifier auxiliary agent: firstly, 50g of phenolic aldehyde amine polyether (FP-4) and 6.67g of maleic anhydride are subjected to a mono-esterification reaction at the temperature of 80 ℃ for 4h under the condition of taking 0.08g of p-toluenesulfonic acid as a catalyst; then adding 50g of SA-1500 aromatic solvent and 1.13g of acrylic acid; then, dropwise adding an initiator azobisisobutyronitrile (0.29 g is dissolved in 6.67g of aromatic hydrocarbon solvent), carrying out free radical copolymerization reaction for 4 hours at the temperature of 75 ℃, and cooling a reaction product to obtain a demulsifier auxiliary agent B-1;
3) Uniformly mixing the demulsifier main agent A-1 prepared in the step 1), the demulsifier auxiliary agent B-1 prepared in the step 2) and a cationic compound dodecyl dimethyl benzyl ammonium chloride solution (the solution concentration is 45%) according to the proportion of 4.
Example 2
A preparation method of a compound demulsifier for a heavy oil field comprises the following steps:
1) Preparing a main agent of the demulsifier: adding 50g of polyamine polyether (AP-2), 50g of phenol amine type oil head (FP-2) and 71.5g of SA-1500 aromatic hydrocarbon solvent into a reaction kettle, displacing with nitrogen, heating to 90 ℃, dropwise adding aromatic hydrocarbon solution of toluene diisocyanate crosslinking agent (1.5 g of toluene diisocyanate is dissolved in 28.5g of heavy aromatic hydrocarbon), completing dropwise adding within 30 minutes, continuing to react for 2 hours, cooling to below 40 ℃, discharging, and obtaining a demulsifier main agent A-2;
2) Preparing a demulsifier auxiliary agent: firstly, 50g of phenolic aldehyde amine polyether (FP-5) and 3.4g of maleic anhydride are subjected to a mono-esterification reaction at the temperature of 90 ℃ for 2.5h under the condition of taking 1.07g of p-toluenesulfonic acid as a catalyst. Then adding 48g of SA-1500 aromatic solvent and 5.34g of acrylic acid; then dropping initiator benzoyl peroxide (1.1 g is dissolved in 7.34g of aromatic hydrocarbon solvent), carrying out free radical copolymerization reaction for 3h at 90 ℃, and cooling reaction products to obtain a demulsifier auxiliary agent B-2;
3) Uniformly mixing the demulsifier main agent A-2 prepared in the step 1), the demulsifier auxiliary agent B-2 prepared in the step 2) and a cationic compound tetradecyl dimethyl benzyl ammonium chloride solution (the solution concentration is 50%) according to the proportion of 4.
Example 3
A preparation method of a compound demulsifier for a heavy oil field comprises the following steps:
1) Preparing a main agent of the demulsifier: adding 50g of polyamine polyether (AP-3), 20g of phenol amine type oil head (FP-3) and 63.8g of SA-1500 aromatic solvent into a reaction kettle, replacing with nitrogen, heating to 90 ℃, dropwise adding aromatic solution of toluene diisocyanate crosslinking agent (1.54 g of toluene diisocyanate is dissolved in 6.2g of heavy aromatic hydrocarbon), completing dropwise adding within 45 minutes, continuing to react for 1.5 hours, cooling to below 40 ℃, discharging, and obtaining a demulsifier main agent A-3;
2) Preparing a demulsifier auxiliary agent: firstly, 50g of phenolic aldehyde amine polyether (FP-6) and 4.5g of maleic anhydride are subjected to a mono-esterification reaction at the temperature of 85 ℃ for 3.2h under the condition of taking 0.7g of p-toluenesulfonic acid as a catalyst. Then adding 48g of SA-1500 aromatic solvent and 3.27g of acrylic acid; then, dripping initiator benzoyl peroxide (0.75 g is dissolved in 7.34g of aromatic hydrocarbon solvent), carrying out free radical copolymerization reaction for 3.5h at 83 ℃, and cooling reaction products to obtain a demulsifier auxiliary agent B-3;
3) Uniformly mixing the main agent A-3 of the demulsifier prepared in the step 1), the auxiliary agent B-3 of the demulsifier prepared in the step 2) and the solution of cationic compound octadecyl dimethyl benzyl ammonium chloride (the solution concentration is 50%) according to the proportion of (2).
Performance detection
The experimental conditions are as follows: the oil sample source is a thick oil water sample of the Bohai sea oil field;
the mixing mode is as follows: 120 times;
experiment temperature: 70 ℃;
volume of oil sample: 80ml;
water content: 40 percent.
The results are shown in Table 1.
TABLE 1
As can be seen from the table 1, the dehydration speed, the dehydration amount, the interface state and the water quality state are all improved after the polyether is modified and compounded, and the prepared demulsifiers DA-1, DA-2 and DA-3 have good dehydration effect and are suitable for dehydrating heavy oil products.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a heavy oil field is with compound type demulsifier which characterized in that: the emulsion breaker comprises an emulsion breaker main agent, an emulsion breaker auxiliary agent and a cationic compound, wherein the emulsion breaker main agent comprises: demulsifier auxiliary agent: the mass ratio of the cationic compound is 2-4:1-4:1;
the main agent of the demulsifier is obtained by reacting polyamine polyether and phenolic amine oil head in an aromatic hydrocarbon solvent by adopting an isocyanate crosslinking agent; polyamine-based polyether: a phenol amine type oil head: the mass ratio of the aromatic hydrocarbon solvent is 1-5; the isocyanate crosslinking agent accounts for 1.5 to 3.0 percent of the total mass of the polyamine polyether and the phenolic amine oil head;
the auxiliary agent of the demulsifier is maleic anhydride modified polyether demulsifier;
the cationic compound is one or more of dodecyl dimethyl benzyl ammonium chloride, tetradecyl dimethyl benzyl ammonium chloride and octadecyl dimethyl benzyl ammonium chloride solution, and the concentration of the solution is 40-50%.
2. The compound demulsifier for the heavy oil field according to claim 1, wherein: the polyamine polyether is a copolymer of propylene oxide and ethylene oxide which takes triethylene tetramine, tetraethylene pentamine or polyethylene polyamine as an initiator.
3. The compound demulsifier for heavy oil fields according to claim 2, wherein: the mass ratio of the initiator to the propylene oxide is 1.
4. The compound demulsifier for the heavy oil field according to claim 1, wherein: the phenolic aldehyde amine oil head is a copolymer of phenolic aldehyde amine resin and propylene oxide serving as an initiator.
5. The compound demulsifier for the heavy oil field according to claim 4, wherein: the mass ratio of the phenolic aldehyde amine resin to the propylene oxide is 1.
6. The compound demulsifier for the heavy oil field according to claim 1, wherein the compound demulsifier comprises: the isocyanate crosslinking agent is selected from toluene diisocyanate or diphenylmethane diisocyanate.
7. The compound demulsifier for the heavy oil field according to claim 1, wherein: the isocyanate crosslinking agent is added in the form of isocyanate crosslinking agent aromatic hydrocarbon solution, and the mass concentration of the isocyanate crosslinking agent aromatic hydrocarbon solution is 5-20%.
8. A method for preparing the compound demulsifier for the heavy oil field of any one of claims 1 to 7, which is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a main agent of a demulsifier: adding a specified amount of polyamine polyether, a phenolic amine oil head and an aromatic solvent into a reaction kettle, replacing nitrogen, dropwise adding an isocyanate crosslinking agent at 90-100 ℃, continuously reacting for 1-2 hours after dropwise adding is completed within 30-60 minutes, and cooling to below 40 ℃ to discharge;
s2, preparing a demulsifier auxiliary agent: performing mono-esterification reaction on phenolic amine type polyether and maleic anhydride, adding a small molecular double-bond compound, and performing free radical polymerization to obtain a maleic anhydride modified polyether demulsifier;
and S3, uniformly mixing the main agent of the demulsifier prepared in the step S1, the auxiliary agent of the demulsifier prepared in the step S2 and the cationic compound to obtain the compound demulsifier for the heavy oil field.
9. The preparation method of the compound demulsifier for the heavy oil field according to claim 8, wherein the compound demulsifier comprises: in the step S2, the preparation method of the maleic anhydride modified polyether demulsifier comprises the following steps:
a. performing mono-esterification reaction on phenolic aldehyde amine polyether and maleic anhydride under the condition that p-toluenesulfonic acid is used as a catalyst; the mass ratio of the phenolic aldehyde amine polyether to the maleic anhydride is 7.5-15; the mass of the p-toluenesulfonic acid is 0.5-2% of the total mass of the phenol aldehyde amine polyether and the maleic anhydride; the reaction temperature is 80-90 ℃, and the reaction time is 2.5-4 h;
b. adding a solvent and an unsaturated double-bond compound monomer, wherein the adding amount of the unsaturated double-bond compound monomer and the solvent is respectively 2-10% and 70-120% of the mass of the polyether containing the double-bond structure;
c. dropping initiator in the amount of 0.5-2.0 wt% of the total weight of the double bond structure polyether and the unsaturated double bond compound; carrying out free radical copolymerization reaction for 3-4 h at 75-90 ℃, and cooling the reaction product to obtain the demulsifier auxiliary agent.
10. The preparation method of the compound demulsifier for the heavy oil field according to claim 9, wherein the compound demulsifier comprises: the phenolic amine polyether is a copolymer of phenolic amine resin, propylene oxide and ethylene oxide, and the mass ratio of the phenolic amine resin to the propylene oxide is 1:39 to 129 percent, and the ethylene oxide accounts for 12.5 to 25 percent of the total weight of the polyether; the solvent is an aromatic hydrocarbon solvent; the unsaturated double-bond compound is one of acrylic acid, methyl acrylate or methyl methacrylate; the initiator is one of benzoyl peroxide and azobisisobutyronitrile.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102453497A (en) * | 2010-10-25 | 2012-05-16 | 中国石油化工股份有限公司 | Demulsification method for hydrocarbon oil |
| CN103333712A (en) * | 2013-07-19 | 2013-10-02 | 魏文辉 | Demulsifying agent for ternary oil displacement produced liquid |
| CN114920921A (en) * | 2022-03-14 | 2022-08-19 | 中海油(天津)油田化工有限公司 | Polyether demulsifier modified by Mannich reaction and preparation method thereof |
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