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Low-temperature demulsifier suitable for naphthenic-intermediate base crude oil emulsion and its preparation and use

A technology of intermediate base crude oil and emulsion, which is applied in the direction of dehydration/emulsion breaking by chemical methods, can solve the problems of not having broad spectrum, weak applicability, and poor effect, so as to improve the efficiency of demulsification and dehydration, reduce the High oil-water interfacial tension and high demulsification efficiency

Active Publication Date: 2021-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problems that the low-temperature demulsifier in the prior art is not effective for the crude oil emulsion of naphthene-intermediate base, does not have broad spectrum, and has poor applicability, and then provides a kind of suitable for naphthene-intermediate base oil emulsion. Low temperature demulsifier for intermediate base crude oil

Method used

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  • Low-temperature demulsifier suitable for naphthenic-intermediate base crude oil emulsion and its preparation and use
  • Low-temperature demulsifier suitable for naphthenic-intermediate base crude oil emulsion and its preparation and use

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In the stirred reactor, add the N-methylimidazole that quality is respectively 0.5kg, the n-heptane bromide of 0.3kg and the normal heptane of 714ml, the n-heptane of described N-methylimidazole, n-hexane bromide and, The mass ratio is 1:0.6:1, and nitrogen is used to replace the air in the stirred reactor for 3 times, so that the stirred reactor is in a nitrogen atmosphere. The reactor was heated to 90°C under stirring, and the stirring was stopped after 2 hours of reaction.

[0027] After the reacted crude product was cooled to 25°C, the crude product and acetone were mixed and shaken according to the volume ratio of 1:5. In this example, the amount of acetone added was 3570ml, and it was rotary evaporated at 40°C for 8 minutes, that is 1-Hexyl-3-methylimidazole bromide ([HMIM]Br) was obtained as a solid.

[0028] Add the above-mentioned [HMIM]Br and 0.32kg of ammonium fluoroborate NH with a quality of 0.64kg in the stirred reactor 4 BF 4 And 823ml of methanol, the...

Embodiment 2

[0031] The ionic liquid [HMIM] BF used in this embodiment 4 The preparation process is described in Example 1.

[0032] In the stirred reactor, add the [HMIM] BF of 0.1kg p-phenoxy dilauryl alcohol (HBA) and 0.3kg 4 , replaced with nitrogen for 3 times, heated the reactor to 130°C under stirring, quickly added 0.1kg of ethylene oxide, stopped stirring after 1.0h of reaction, cooled to room temperature and rotary steamed at 25°C for 2 minutes to obtain p-phenoxy Ionic liquid solution of dilauryl ether (HBA(EO) n -IL). Get 0.3kg of the ionic liquid solution of p-phenoxy dilauryl ether, then add 0.03kg of decanyl alcohol polyoxyethylene ether, 0.04kg of octylphenol polyoxyethylene ether and 0.03kg of allyl polyoxyethylene ether to mix, Stir evenly to obtain ionic liquid demulsifier A.

[0033] In the present embodiment, the amount of the ionic liquid solution of phenoxy dilauryl ether is 75 parts by weight, the amount of decyl alcohol polyoxyethylene ether is 7.5 parts by wei...

Embodiment 3

[0035] The ionic liquid [HMIM] BF used in this embodiment 4 The preparation process is described in Example 1.

[0036] In the stirred reactor, add the [HMIM] BF of 0.08kg p-phenoxy dilauryl alcohol (HBA) and 0.3kg 4 , replaced with nitrogen for 3 times, heated the reactor to 130°C under stirring, quickly added 0.08kg of ethylene oxide, stopped stirring after 1.5h of reaction, cooled to room temperature and rotary steamed at 25°C for 2 minutes to obtain p-phenoxy Ionic liquid solution of dilauryl ether (HBA(EO) n -IL). Get 0.15kg of ionic liquid solution of p-phenoxy dilauryl ether, add 0.02kg of decanyl alcohol polyoxyethylene ether, 0.015kg of octylphenol polyoxyethylene ether and 0.015kg of allyl polyoxyethylene ether to mix, Stir evenly to obtain ionic liquid demulsifier B.

[0037] In the present embodiment, the amount of the ionic liquid solution of phenoxy dilauryl ether is 75 parts by weight, the amount of decanyl alcohol polyoxyethylene ether is 10 parts by weight...

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Abstract

The invention provides a low-temperature demulsifier suitable for naphthene-intermediate base crude oil emulsions, the demulsifier will use specific weight parts of the ionic liquid solution of p-phenoxy dilauryl ether, decanyl alcohol polyoxyethylene ether, Octylphenol polyoxyethylene ether and allyl polyoxyethylene ether are compounded, and the ionic liquid solution of p-phenoxy dilauryl ether belongs to a non-ionic Gemini low-temperature demulsifier, decanyl alcohol polyoxyethylene ether , octylphenol polyoxyethylene ether and allyl polyoxyethylene ether are single-chain demulsifiers. The compounding of each component plays a synergistic effect, which can adapt to the low-temperature demulsification requirements of various different crude oil emulsion systems, and greatly increases the broad-spectrum adaptability of the low-temperature demulsification system. The low-temperature demulsifier described in the present invention is used for naphthene ‑Demulsification and dehydration of intermediate base crude oil emulsion can achieve excellent results.

Description

technical field [0001] The invention belongs to the field of preparation and application of crude oil emulsion low-temperature demulsifiers, in particular to a preparation method of a novel low-temperature oilfield demulsifier. Background technique [0002] At present, the world's energy crisis is becoming more and more serious, and the exploitation of many domestic oil fields has entered a period of high water cut. New crude oil recovery technologies such as steam flooding, polymer and ASP flooding have been continuously applied to crude oil recovery. The application of new technologies has promoted the recovery of crude oil, and also led to the increase of water content in crude oil emulsion. The stability of the liquid is enhanced, so that the demulsification of crude oil becomes more and more difficult. There are problems such as high demulsification temperature, a large amount of heat energy consumption, poor dispersion effect of demulsifier and large dosage. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04
CPCC10G33/04
Inventor 周海刚刘东徐英彪殷长龙
Owner CHINA PETROLEUM & CHEM CORP
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