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Polyether anionic surfactant and method for improving oil and gas recovery ratio

A surfactant and anionic technology, applied in the field of polyether anionic surfactants, can solve problems such as poor sweep efficiency, high viscosity of crude oil, and poor fluidity of crude oil, and achieve strong salt resistance, high hydrothermal stability, and salt resistance The effect of ability improvement

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main difficulty in the production of heavy oil is that the viscosity of crude oil is high, the fluidity of crude oil is poor, and the viscosity of crude oil is high, resulting in poor sweep efficiency during the displacement process of general displacement fluids (such as hot water)

Method used

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  • Polyether anionic surfactant and method for improving oil and gas recovery ratio
  • Polyether anionic surfactant and method for improving oil and gas recovery ratio
  • Polyether anionic surfactant and method for improving oil and gas recovery ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis of Octadecyl Naphthalene Methanol Polyether Ammonium Sulfonate Anionic Nonionic Surfactant:

[0032] Add a certain amount of octadecylnaphthalene methanol and 0.5% KOH by mass and 30ppm phosphazene catalyst in the polymerization reactor, heat the system temperature to 80-90°C under stirring, open the vacuum system, dehydrate for 1 hour, and then use Nitrogen is purged 3 to 4 times to remove the air in the system, and then the reaction temperature is raised to 200°C, and then a metered amount of butylene oxide is slowly introduced to control the reaction pressure <2.0MPa to carry out the etherification reaction. After the reaction of this step is completed, the temperature is lowered to 180°C, and the calculated amount of propylene oxide is continued to be introduced slowly. Until the end of the reaction (the reaction pressure remains constant), the system is purged with nitrogen to remove unreacted ethylene oxide to obtain the alkylaryl polyether nonionic surf...

Embodiment 2

[0048] Synthesis of Nonylbenzyl Alcohol Polyether Carboxylate Calcium Anion Nonionic Surfactant:

[0049] Add a certain amount of 4-nonyl 2-hydroxymethylphenylpropionic acid and 1% KOH based on its mass as a catalyst in the polymerization reactor, heat the system temperature to 80-90°C while stirring, turn on the vacuum system, and dehydrate for 1 hour , and then purged with nitrogen for 3 to 4 times to remove the air in the system, then raise the reaction temperature to 200°C and slowly feed in the measured amount of butylene oxide, and control the reaction pressure <2.0MPa to carry out the etherification reaction. After the reaction of this step is completed, the temperature is lowered to 180°C, and the calculated amount of propylene oxide is continued to be introduced slowly. Until the reaction is finished (the reaction pressure remains constant), the system is purged with nitrogen to remove unreacted ethylene oxide to obtain 4-nonyl-2-hydroxymethyl polyether potassium phen...

Embodiment 3

[0059] Synthesis of Pentadecylbenzyl Alcohol Polyether Sulfonate Magnesium Anionic Nonionic Surfactant:

[0060] Add pentadecylbenzyl alcohol, 2.0% KOH by mass and 30ppm phosphazene catalyst in the polymerization reactor, heat the system temperature to 80-90°C under stirring, open the vacuum system, dehydrate for 1 hour, and then blow it with nitrogen 3 to 4 times to remove the air in the system, then raise the reaction temperature to 180°C and then slowly feed in the measured amount of butylene oxide, and control the reaction pressure <0.60MPa to carry out the etherification reaction. After the reaction of this step is finished, continue to slowly feed the calculated amount of propylene oxide. After the reaction is over, add the calculated amount of ethylene oxide again, cool down to 150° C., and carry out the etherification reaction again until the end of the reaction (reaction pressure constant), with nitrogen purging system, remove unreacted oxirane, obtain pentadecylbenzy...

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Abstract

The invention relates to a polyether anionic surfactant and a method for improving oil and gas recovery efficiency, the polyether anionic surfactant is adopted, the molecular general formula of the polyether anionic surfactant is shown in the specification, and the substituent R is any one of C1-C24 fatty groups; r1, R2 and R3 are independently selected from at least one of H, methyl and ethyl; x, y and z are polymerization degrees, and x, y and z are independently selected from any one of 1 to 100; x is any one of an alkylene group, an alkenylene group and an arylene group containing 0-10 carbon atoms or an alkylene group, an alkenylene group and an arylene group containing 0-10 carbon atoms and a substituent group; y is an anion group, and a is the absolute value of the valence of Y; m is a cation or a cation group, and b is the absolute value of the valence of M; ar is an aromatic ring or an aromatic ring containing a substituent group; and m is any integer of 1-5, and the method can be used for the enhanced oil extraction process of an oil field.

Description

technical field [0001] The invention relates to a polyether anionic surfactant and a method for improving oil and gas recovery. Background technique [0002] Heavy oil occupies a relatively large proportion of the world's oil and gas resources, and the reserves of heavy oil, super heavy oil and natural bitumen in the world are about 1000×10 8 Ton. Countries rich in heavy oil resources include Canada, Venezuela, the United States, the former Soviet Union, China, and Indonesia. Heavy oil resources are widely distributed in China, and the exploitation of heavy oil has great potential. With the reduction of light oil reserves, the proportion of heavy oil will continue to increase. Sinopec is rich in heavy oil resources, accounting for about 1 / 3 of the country's total. The active heavy oil reserves are mainly concentrated in Shengli, Northwest, Henan and other oil fields, about 2.1 billion tons. The main development methods are water flooding and steam injection thermal recover...

Claims

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Application Information

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IPC IPC(8): C08G65/326C08G65/332C08G65/28C09K8/584
CPCC08G65/326C08G65/2612C08G65/2615C08G65/3322C09K8/584
Inventor 李应成鲍新宁吴欣悦何秀娟何立李斌吴国英裘鋆
Owner CHINA PETROLEUM & CHEM CORP
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