CN117965196A - Demulsifier for thickened oil field and preparation method thereof - Google Patents
Demulsifier for thickened oil field and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 70
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 22
- KBJFYLLAMSZSOG-UHFFFAOYSA-N n-(3-trimethoxysilylpropyl)aniline Chemical compound CO[Si](OC)(OC)CCCNC1=CC=CC=C1 KBJFYLLAMSZSOG-UHFFFAOYSA-N 0.000 claims abstract description 19
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims abstract description 16
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000706 filtrate Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 239000000047 product Substances 0.000 claims abstract description 5
- 238000010926 purge Methods 0.000 claims abstract description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 33
- 230000007423 decrease Effects 0.000 description 16
- 239000010779 crude oil Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- 239000004721 Polyphenylene oxide Substances 0.000 description 9
- 229920000570 polyether Polymers 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000018044 dehydration Effects 0.000 description 6
- 238000006297 dehydration reaction Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002569 water oil cream Substances 0.000 description 1
Abstract
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a demulsifier for a thickened oil field and a preparation method thereof. The preparation method of the demulsifier comprises the following steps: adding trimethoxy [3- (phenylamino) propyl ] silane and a catalyst into a high-pressure reaction kettle in sequence, purging the reaction kettle with nitrogen, vacuumizing and heating at the same time, stopping vacuumizing when the temperature reaches 90 ℃, introducing ethylene oxide, heating to 140-170 ℃ and carrying out heat preservation reaction; the reaction pressure gradually drops, and when the pressure no longer drops, the reaction is stopped; cooling and filtering, regulating pH of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding sulfamic acid, stirring while heating to 100-130 ℃, keeping the temperature for reaction for 1-4h, cooling to below 60 ℃, regulating pH to 7-8 with sodium hydroxide solution, adding 10wt% of ethanolamine, stirring and dissolving to obtain the product demulsifier. The demulsifier has the characteristics of simple synthesis process and high deoiling rate.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation, and particularly relates to a demulsifier for a thickened oil field and a preparation method thereof.
Background
Crude oil is extracted from underground in an oil-water emulsion state, and the comprehensive water content of most of crude oil in oil fields on the land in China is more than 80%, so that the loads of pumps, pipelines and storage tanks are increased, and the surface corrosion and scaling of metal equipment are caused; the crude oil contained in the discharged water also causes environmental pollution and waste of the crude oil, so that the crude oil needs to be demulsified and dehydrated from the economical point of view and the environmental protection point of view, and the clean result of the oil is achieved.
Due to the continuous promotion of new technology, the recovery ratio of crude oil is obviously improved, but the emulsification of effluent is more and more serious. The greater the oil content in the produced water, the more various the morphology of the crude oil emulsion and the greater the difficulty of demulsification and dehydration of the crude oil.
Because the chemical demulsifier has the advantages of high activity, quick response and the like, the demulsifier is added to be the most commonly used crude oil dehydration method at present. The demulsifier is an oilfield chemical agent for oil-water separation of petroleum produced liquid, and the principle is that the demulsifier is deep and adhered to the interface of emulsified liquid drops to replace the original emulsifier and destroy surface film, so that the liquid drops coated in the film are released and coalesced, and the oil phase and the water phase are separated.
CN109575984a discloses a crude oil demulsifier for normal low temperature, which comprises the following components: 10-50% by mass of a silicone polyether having a viscosity of 200-300cSt, an HLB value of 7-10 and a closed flash point of greater than 60 ℃; one or a mixture of more than 50 to 90 percent of the mass fraction is used as a solvent. The silicone polyether in the crude oil demulsifier composition has different structures and molecular weight distribution, has high-efficiency oil-water demulsification effect, has low surface tension, low cohesive energy and low temperature sensitivity, can realize demulsification at a low temperature of 30 ℃, reduces the addition amount by more than 50 percent compared with the polyether surfactant singly, has high dehydration rate, good demulsification effect and reduces the comprehensive cost. The crude oil demulsifier has a crude oil dehydration rate of 40% in 120min, can not meet the production requirement, and has a dehydration effect to be improved.
CN 200510130345A discloses a polyether type crude oil demulsifier. The polyether is obtained by reacting polyethylene polyamine or nonylphenol-aldehyde resin serving as an initiator with ethylene oxide and propylene oxide to obtain polyether, and then mixing the polyether with a chain extender and pyridine to react. The invention has the advantages of simple preparation process, small dosage, good demulsification and dehydration effects, low cost and the like, but the demulsifier can not achieve the effect of low-temperature demulsification to save heat energy.
Disclosure of Invention
The invention provides a demulsifier for a thickened oil field and a preparation method thereof, aiming at the defects of the prior art. The demulsifier has the characteristics of simple synthesis process and high deoiling rate.
The invention discloses a demulsifier for thick oil fields, which has the following molecular structural formula:
wherein n is a positive integer of 4-40.
The invention further provides a preparation method of the demulsifier for the thick oil field, which comprises the following steps:
(1) Adding trimethoxy [3- (phenylamino) propyl ] silane and a catalyst into a high-pressure reaction kettle in sequence, purging the reaction kettle with nitrogen, vacuumizing and heating at the same time, stopping vacuumizing when the temperature reaches 90 ℃, introducing ethylene oxide, heating to 140-170 ℃ and carrying out heat preservation reaction; the reaction pressure gradually drops, and when the pressure no longer drops, the reaction is stopped;
(2) Cooling and filtering, regulating pH of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding sulfamic acid, stirring while heating to 100-130 ℃, keeping the temperature for reaction for 1-4h, cooling to below 60 ℃, regulating pH to 7-8 with sodium hydroxide solution, adding 10wt% of ethanolamine, stirring and dissolving to obtain the product demulsifier.
In the present invention, preferably, the molar ratio of ethylene oxide, sulfamic acid to trimethoxy [3- (phenylamino) propyl ] silane is 4 to 40:0.8-1.2:1. more preferably, the molar ratio of ethylene oxide, sulfamic acid to trimethoxy [3- (phenylamino) propyl ] silane is from 10 to 40:0.9-1.1:1.
In the present invention, preferably, the catalyst in the step (1) is one of sodium hydroxide, calcium hydroxide and potassium hydroxide, and the mass ratio of trimethoxy [3- (phenylamino) propyl ] silane is 0.05-0.2:1.
In the present invention, preferably, the mass ratio of 10wt% of ethanolamine to trimethoxy [3- (phenylamino) propyl ] silane in step (2) is 2 to 6:1.
The synthetic reaction equation of the demulsifier for the thickened oil field is as follows:
The demulsifier for the thickened oil field is a silicon-containing polyether demulsifier, has excellent surface activity performance, and can realize high-efficiency demulsification effect under severe conditions. The lipophilic group is silane and benzene ring, and the hydrophilic group is polyoxyethylene ether segment and sulfuric acid group. Because the invention has super-strong interfacial activity, molecules can enter an oil-water interface to replace a surfactant with strong emulsifying property, surfactant molecules and other surface active substances in oil drops can be replaced, the emulsifying capacity of the oil drops is destroyed, and the oil drops are easier to be condensed. After the emulsion enters oil drops, the electric double layer is destroyed by compression, the strength of the interfacial film is weakened, so that emulsion drops mutually collide and coalesce, and the emulsion drops are released to form oil drops with large particle size, thereby achieving the purpose of emulsion breaking. The polyether segment in the molecule belongs to a linear structure, has high flexibility, is easy to generate internal rotation of a molecular chain, sweeps and catches tiny oil drops, increases the collision opportunity of the oil drops, and forms oil drops which are easy to aggregate and float upwards so as to achieve the purpose of demulsification. The demulsifier for the thickened oil field has excellent stability and heat resistance, and can keep stable performance under the conditions of high temperature and high pressure.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The demulsifier for the thickened oil field has the advantages of wide raw material sources, low price and simple synthesis process;
(2) The demulsifier for the thickened oil field has a good demulsification effect, and the maximum oil removal rate reaches 98.8% or more when the concentration is 100 mg/L.
Detailed Description
The invention will be described in further detail below with reference to specific examples and with reference to the data. It should be understood that these examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
Example 1
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 1.28g of sodium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 0.4mol of ethylene oxide is introduced, the temperature is raised to 140 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.08mol of sulfamic acid, heating to 100deg.C under stirring, reacting for 1 hr under heat preservation, cooling to below 60deg.C, regulating pH value to 7-8 with sodium hydroxide solution, adding 51g of 10wt% ethanolamine, stirring and dissolving to obtain demulsifier.
Example 2
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 2.4g of sodium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 0.8mol of ethylene oxide is introduced, the temperature is raised to 140 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.12mol sulfamic acid, heating to 100deg.C under stirring, reacting for 1 hr under heat preservation, cooling to below 60deg.C, regulating pH value to 7-8 with sodium hydroxide solution, adding 75g 10wt% ethanolamine, stirring and dissolving to obtain demulsifier.
Example 3
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 2.8g of sodium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 1mol of ethylene oxide is introduced, the temperature is raised to 150 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.085mol sulfamic acid, heating to 110 ℃ while stirring, reacting for 2h while maintaining the temperature, cooling to below 60 ℃, regulating pH value to 7-8 with sodium hydroxide solution, adding 90g of 10wt% ethanolamine, stirring and dissolving to obtain the product demulsifier.
Example 4
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 3.9g of calcium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 1.5mol of ethylene oxide is introduced, and the temperature is raised to 155 ℃ and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.115mol sulfamic acid, stirring, heating to 111 ℃, keeping the temperature for 2.5h, cooling to 60 ℃ or below, regulating pH value to 7-8 with sodium hydroxide solution, adding 102g of 10wt% ethanolamine, stirring and dissolving to obtain the demulsifier.
Example 5
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 4.2g of calcium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 2mol of ethylene oxide is introduced, the temperature is raised to 160 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.09mol of sulfamic acid, heating to 120 ℃ while stirring, reacting for 3 hours while maintaining the temperature, cooling to below 60 ℃, regulating pH value to 7-8 with sodium hydroxide solution, adding 115g of 10wt% ethanolamine, stirring and dissolving to obtain the demulsifier.
Example 6
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 4.5g of potassium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 2.5mol of ethylene oxide is introduced, the temperature is raised to 160 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.11mol sulfamic acid, heating to 120 ℃ while stirring, reacting for 4 hours while maintaining the temperature, cooling to below 60 ℃, regulating pH value to 7-8 with sodium hydroxide solution, adding 128g of 10wt% ethanolamine, stirring and dissolving to obtain the demulsifier.
Example 7
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 4.8g of potassium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 3mol of ethylene oxide is introduced, the temperature is raised to 165 ℃, and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.095mol sulfamic acid, stirring, heating to 130 ℃, keeping the temperature for 2h, cooling to below 60 ℃, regulating pH value to 7-8 with sodium hydroxide solution, adding 141g of 10wt% ethanolamine, stirring and dissolving to obtain the demulsifier.
Example 8
(1) 0.1Mol of trimethoxy [3- (phenylamino) propyl ] silane and 5.1g of potassium hydroxide are sequentially added into a high-pressure reaction kettle, the reaction kettle is purged by nitrogen, vacuumizing is performed, heating is performed at the same time, when the temperature reaches 90 ℃, vacuumizing is stopped, 4mol of ethylene oxide is introduced, and the temperature is raised to 170 ℃ and the reaction is performed at the same time. The reaction pressure gradually decreases, and when the pressure no longer decreases, the reaction is stopped.
(2) Cooling and filtering, regulating pH value of filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding 0.1mol sulfamic acid, stirring, heating to 130 ℃, keeping the temperature for 3.5h, cooling to below 60 ℃, regulating pH value to 7-8 with sodium hydroxide solution, adding 153g of 10wt% ethanolamine, stirring and dissolving to obtain the product demulsifier.
Example 9 evaluation of demulsification Effect
And standing the compound oil displacement production liquid of a thick oil block of a certain oil field for 24 hours, and taking a crude oil sample with an intermediate emulsified zone after oil-water separation, wherein the oil content is 28000mg/L through testing.
The demulsifier performance of the demulsifier of the present invention (examples 1-8) was evaluated at 65℃with reference to SY/T5797-1993 "method for evaluation of oil-in-water emulsion demulsifier Performance", and the dosage was 50, 100mg/L.
The evaluation results are shown in Table 1.
TABLE 1 demulsifier Performance test results
As can be seen from table 1:
(1) The demulsifier for the thickened oil field (examples 1-7) has the oil removal rate of more than 98 percent and the maximum oil removal rate of 99.6 percent when the using concentration is 50mg/L, and has good demulsification effect;
(2) The demulsifier for the thickened oil field (examples 1-7) has the oil removal rate of more than or equal to 98.8 percent and the maximum oil removal rate of 99.7 percent when the using concentration is 100 mg/L; the demulsification effect is good.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent variation, modification and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical scheme of the present invention.
Claims (5)
1. The preparation method of the demulsifier for the thick oil field is characterized by comprising the following steps of:
(1) Adding trimethoxy [3- (phenylamino) propyl ] silane and a catalyst into a high-pressure reaction kettle in sequence, purging the reaction kettle with nitrogen, vacuumizing and heating at the same time, stopping vacuumizing when the temperature reaches 90 ℃, introducing ethylene oxide, heating to 140-170 ℃ and carrying out heat preservation reaction; the reaction pressure gradually drops, and when the pressure no longer drops, the reaction is stopped;
(2) Cooling and filtering, regulating pH of the filtrate to 3-4 with sulfuric acid, transferring to the high-pressure reaction kettle, adding sulfamic acid, stirring and heating to 100-130 ℃, keeping the temperature for reaction for 1-4 hours, cooling to below 60 ℃, regulating pH to 7-8 with sodium hydroxide solution, adding 10wt% of ethanolamine, stirring and dissolving to obtain a product demulsifier;
The molecular structural formula of the demulsifier is as follows:
Wherein n is a positive integer of 4-40;
the mol ratio of the ethylene oxide, sulfamic acid and trimethoxy [3- (phenylamino) propyl ] silane is 4-40:0.8-1.2:1.
2. The method for preparing the demulsifier for the thick oil field according to claim 1, wherein the molar ratio of the ethylene oxide, the sulfamic acid and the trimethoxy [3- (phenylamino) propyl ] silane is 10-40:0.9-1.1:1.
3. The preparation method of the demulsifier for the thick oil field according to claim 1, wherein the catalyst in the step (1) is one of sodium hydroxide, calcium hydroxide and potassium hydroxide, and the mass ratio of the catalyst to trimethoxy [3- (phenylamino) propyl ] silane is 0.05-0.2:1.
4. The method for preparing the demulsifier for the thick oil oilfield according to claim 1, wherein the mass ratio of the 10wt% ethanolamine to the trimethoxy [3- (phenylamino) propyl ] silane in the step (2) is 2-6:1.
5. The demulsifier for the thickened oil field is characterized by comprising the following molecular structural formula:
wherein n is a positive integer of 4-40.
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