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Enhanced oil recovery surfactant and preparation method thereof

A technology of surfactant and enhanced oil recovery, which is applied in the fields of chemical instruments and methods, sulfonate preparation, organic chemistry, etc., can solve the problems of high oil displacement efficiency and low oil displacement efficiency, and achieve enhanced oil recovery and improved oil recovery. Effect of salt, good technical effect

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the low oil displacement efficiency of surfactants in the prior art under high temperature and high salinity conditions. A new surfactant for enhanced oil recovery is provided. Features of high oil displacement efficiency under high salt conditions

Method used

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  • Enhanced oil recovery surfactant and preparation method thereof
  • Enhanced oil recovery surfactant and preparation method thereof
  • Enhanced oil recovery surfactant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Surfactant Preparation

[0024] a) Add 0.5 mol of nonylphenol, 1.5 g of sodium hydroxide and 15 g of water into a reactor equipped with a condensing device, a stirring device, and a gas disperser, and heat to 85° C. while nitrogen is blown, and then stir for 1 hour. Turn on the vacuum system, vacuumize and dehydrate for 1 hour at a temperature of 90°C, and then use nitrogen to blow 4 times to remove the air in the system, then adjust the reaction temperature of the system to 150°C and slowly introduce 1.5mol ethylene oxide, Control the pressure to ≤0.40MPa to carry out the ethoxylation reaction; after the reaction, purge the system with nitrogen, neutralize it with glacial acetic acid after cooling, and obtain 0.49mol of nonylphenol polyoxyethylene (3) ether.

[0025] b) Add the nonylphenol polyoxyethylene ether (3) obtained in step a) into a reactor equipped with a stirring device, a condensation reflux device and a water separation device, add 250 ml of benzene and...

Embodiment 2

[0035] 1. Surfactant Preparation

[0036] a) Add 0.5 mol of nonylphenol, 1.5 g of sodium hydroxide and 15 g of water into a reactor equipped with a condensing device, a stirring device, and a gas disperser, and heat to 85° C. while nitrogen is blown, and then stir for 1 hour. Turn on the vacuum system, vacuumize and dehydrate for 1 hour at a temperature of 90°C, then purge 4 times with nitrogen to remove the air in the system, then adjust the reaction temperature of the system to 150°C and slowly introduce 0.5mol ethylene oxide, The ethoxylation reaction was carried out by controlling the pressure to ≤0.40 MPa; after the reaction was completed, the system was purged with nitrogen, and neutralized with glacial acetic acid after cooling to obtain 130 g of nonylphenol polyoxyethylene (1) ether.

[0037] b) Add 0.5mol of nonylphenol polyoxyethylene ether (1) obtained in step a) into a reactor equipped with a stirring device, a condensation reflux device and a water separation device...

Embodiment 3

[0042] 1. Surfactant Preparation

[0043] a) Add 0.5 mol of nonylphenol, 1.5 g of sodium hydroxide and 15 g of water into a reactor equipped with a condensing device, a stirring device, and a gas disperser, and heat to 85° C. while nitrogen is blown, and then stir for 1 hour. Turn on the vacuum system, vacuumize and dehydrate for 1 hour at a temperature of 90°C, then purge 4 times with nitrogen to remove the air in the system, then adjust the reaction temperature of the system to 150°C and slowly introduce 1.0mol ethylene oxide, Control the pressure to ≤0.40MPa to carry out the ethoxylation reaction; after the reaction, purge the system with nitrogen, neutralize it with glacial acetic acid after cooling, and obtain 0.49mol of nonylphenol polyoxyethylene (2) ether.

[0044] b) Add 0.49mol of nonylphenol polyoxyethylene ether (2) obtained in step a) into a reactor equipped with a stirring device, a condensation reflux device and a water separation device, add 250 milliliters of ...

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Abstract

The invention relates to an enhanced oil recovery surfactant and a preparation method thereof, and mainly solves the problem that surfactants in the prior art are low in oil displacement efficiency under the conditions of high temperature and high salt. The employed enhanced oil recovery surfactant has the name of 3-(alkylphenol polyoxyethylene ether)-2-(polyoxypropylene ether)propanesulfonate, and has the structure shown as a formula (I) in the specification. In the formula (I), M is any one of alkali metals and alkali earth metals, n is the molar ratio of M to SO3 group in the formula (I), n is 1 when M is an alkali metal, n is 0.5 when M is an alkali earth metal, R is a C4-C20 alkyl, x=1-20 and y=1-10. The technical scheme relatively well solves the above problem and is applicable to enhanced oil recovery production of oil fields.

Description

technical field [0001] The invention relates to an enhanced oil recovery surfactant for enhancing crude oil recovery and a preparation method thereof. Background technique [0002] After the oil field enters the high water cut period, the remaining oil is trapped in the pores of the reservoir rocks in a discontinuous oil film. The two main forces acting on the oil droplets are viscous force and capillary force. The agent system can reduce the interfacial tension between oil and water, so that the interfacial tension between oil and water in the reservoir can be reduced from 20 to 30mN / m to a low or ultra-low value (10 -3 ~10 - 4 mN / m), it can reduce the resistance caused by the deformation of the oil droplets when the remaining oil is moved, thereby greatly improving the oil displacement efficiency. [0003] Surfactants modified by oil refining by-products such as petroleum sulfonate and heavy alkylbenzene sulfonate are the most widely used surfactants in oil recovery. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/10C07C303/32C09K8/584C08G65/28C08G65/334
CPCC07C303/32C07C309/10C08G65/2612C08G65/3346C08G2650/04C09K8/584
Inventor 鲍新宁张卫东沙鸥李应成
Owner CHINA PETROLEUM & CHEM CORP
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