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A low-temperature rapid demulsifier for polymer flooding crude oil and its preparation method

A crude oil demulsifier and demulsifier technology, applied in the direction of chemical dehydration/demulsification, etc., can solve the problems of high oil content in the extracted water, unsatisfactory demulsification effect, and thick emulsification layer, and achieve low oil content in the extracted water. Excellent compatibility and synergy, clear oil-water interface

Active Publication Date: 2021-11-19
盘锦富隆化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous deepening of tertiary oil recovery, various oil recovery technologies have been applied, among which the use of polymer flooding is one of the methods to enhance oil recovery. Macroscopically, it mainly depends on increasing the viscosity of the displacement fluid and reducing the viscosity of the displacement fluid. The mobility ratio of the displaced fluid increases the swept volume; at the microscopic level, due to its inherent viscoelasticity, the polymer has a stretching effect on the oil film or oil droplets during the flow process, which increases the carrying force and improves the microscopic Oil washing efficiency, but polymer flooding also brings negative effects to crude oil dehydration such as high dehydration temperature, slow dehydration speed, high oil content in dewatered water, thick emulsified layer at oil-water interface, etc. while increasing oil recovery, as disclosed in patent CN101100615 A kind of low-temperature demulsifier applicable to Huabei Oilfield is disclosed, a kind of low-temperature demulsifier for heavy oil is disclosed in the patent CN102321257A, and a kind of low-temperature rapid demulsifier for water-containing waxy crude oil is disclosed in the patent CN1537924A, but these demulsifiers The demulsification effect of polymer flooding crude oil is not ideal, reflecting the strong pertinence of crude oil demulsifiers

Method used

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  • A low-temperature rapid demulsifier for polymer flooding crude oil and its preparation method
  • A low-temperature rapid demulsifier for polymer flooding crude oil and its preparation method
  • A low-temperature rapid demulsifier for polymer flooding crude oil and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0040] 1. Phenolic resin synthesis

[0041] According to the molar ratio, phenol: aldehyde = 1.5: 2.6, successively put octylphenol and benzaldehyde into the reactor, then add 25% xylene of the total mass of octylphenol and benzaldehyde, stir and heat up to 35-45°C , mixed for 1 hour, added 0.25% sulfuric acid of the total mass of octylphenol and benzaldehyde, raised the temperature to 110-120°C and refluxed for 1 hour, gradually heated to 130-135°C and refluxed for 3 hours, cooled to room temperature to obtain phenolic resin R1.2 .Modification of phenolic resin

[0042] According to the molar ratio, phenolic resin R1: epichlorohydrin: hexadecylamine=0.8: 3: 1, first add the phenolic resin R1 in step 1 to the reactor, then add the mass percentage concentration of 3% of the phenolic resin quality It is 60% potassium hydroxide deionized aqueous solution, stir evenly, heat to 90-105°C, then slowly add a proportioned amount of epichlorohydrin to the phenolic resin, keep it warm f...

Embodiment 2

[0050] 1. Phenolic resin synthesis

[0051] According to the molar ratio, phenol: aldehyde = 1.3: 2.1, sequentially put naphthol and furfural into the reactor, then add 22% xylene of the total mass of naphthol and furfural, stir and heat up to 35-45°C, and mix for 1 hour , adding 0.21% benzenesulfonic acid based on the total mass of naphthol and furfural, raising the temperature to 110-120° C. for reflux for 1 hour, gradually heating to 130-135° C. for reflux for 3 hours, cooling to normal temperature to obtain phenolic resin R2.

[0052] 2. Modification of phenolic resin

[0053] According to the molar ratio, phenolic resin R2: epoxy chlorobutane: octadecylamine=0.8: 3: 1, the phenolic resin R1 in the step 1 is added in the reactor earlier, then add the quality of 3% of the phenolic resin quality The percentage concentration is 58% sodium hydroxide deionized aqueous solution, stir evenly, heat to 90 ~ 105 ℃, then slowly add the proportional amount of epoxy chlorobutane to th...

Embodiment 3

[0061] 1. Phenolic resin synthesis

[0062] According to the molar ratio, phenol: aldehyde = 1.2: 2.3, p-tert-butylphenol and formaldehyde are dropped into the reactor successively, then add 24% xylene of the total mass of p-tert-butylphenol and formaldehyde, stir and heat up to 35 ~ 45°C, mix for 1 hour, add 0.25% petroleum sulfonic acid based on the total mass of p-tert-butylphenol and formaldehyde, heat up to 110-120°C and reflux for 1 hour, gradually heat to 130-135°C and reflux for 3 hours, cool to room temperature to obtain Phenolic resin R3.

[0063] 2. Modification of phenolic resin

[0064] According to the molar ratio, phenolic resin R3: epichlorohydrin: methyldiethanolamine=0.8: 3: 1, first add the phenolic resin R1 in step 1 to the reactor, then add the mass percentage of 3% of the phenolic resin quality Concentration of 60% potassium hydroxide deionized aqueous solution, stir evenly, heat to 90 ~ 105 ℃, then slowly add a proportioned amount of epichlorohydrin to...

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Abstract

The invention discloses a low-temperature rapid demulsifier for polymer flooding crude oil and a preparation method thereof. The demulsifier of the present invention is composed of the following components in mass percentage: 35-70% of DR type crude oil demulsifier, 15-60% of conventional TA1031 crude oil demulsifier, 0.5-2% of vitamin C, 3-7% of urea, and the preparation method . The DR type crude oil demulsifier, the conventional demulsifier TA1031, vitamin C and urea are mixed evenly according to the mass percentage, and then the polymer flooding crude oil low temperature rapid demulsifier PR of the present invention is obtained. The demulsifier of the invention can effectively demulsify the crude oil of Daqing polyflooding, and has the characteristics of fast demulsification speed at low temperature, high demulsification efficiency, clear oil-water interface, low oil content in extracted water, and the like.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical preparations, in particular to a low-temperature rapid demulsifier for polymer flooding crude oil and a preparation method thereof. Background technique [0002] With the continuous deepening of tertiary oil recovery, various oil recovery technologies have been applied, among which the use of polymer flooding is one of the methods to enhance oil recovery. Macroscopically, it mainly depends on increasing the viscosity of the displacement fluid and reducing the viscosity of the displacement fluid. The mobility ratio of the displaced fluid increases the swept volume; at the microscopic level, due to its inherent viscoelasticity, the polymer has a stretching effect on the oil film or oil droplets during the flow process, which increases the carrying force and improves the microscopic Oil washing efficiency, but polymer flooding also brings negative effects to crude oil dehydration such as hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 胡新生胡毓桓王方
Owner 盘锦富隆化工有限公司
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