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Preparation method of poly-surfactant for displacement of reservoir oil

A technology of polymer surface agent and oil displacement, which is applied in the field of preparation of polymer surface agent for oil displacement, can solve the problems of unusable polymer surface agent and poor solubility, and achieves the advantages of less by-products, good temperature resistance and safe production. Effect

Inactive Publication Date: 2014-12-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Easily soluble in water, polysurfactants with poor solubility in water cannot be used for water flooding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 400 grams of distilled water, 80 grams of acrylamide, 30 grams of sodium 2-acrylamido octylsulfonate, 30 grams of sodium 2-acrylamido-2-methylpropanesulfonate, 30 grams of sodium acrylate, and 0.5 grams of potassium persulfate. gram, sodium bisulfite 0.5 gram;

[0046] Prepare monomer raw material solution, add distilled water, acrylamide, sodium 2-acrylamido octyl sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate and sodium acrylate into a beaker and stir to dissolve, no order of addition, room temperature Stir evenly and pack into a three-necked flask;

[0047] The weighed potassium persulfate and sodium bisulfite are respectively configured into 5% potassium persulfate aqueous solution and 5% sodium bisulfite aqueous solution;

[0048] Nitrogen was passed through the aqueous monomer solution in the three-necked flask for 10 minutes, stirring was started, and the temperature was raised to 40°C. Aqueous potassium persulfate solution was added and stirred...

Embodiment 2

[0052] Weigh 200 grams of distilled water, 40 grams of acrylamide, 10 grams of 2-acrylamido sodium dodecyl sulfonate, 10 grams of 2-acrylamido-2-methylpropane sulfonate, 10 grams of sodium acrylate, persulfuric acid Potassium 0.1 g, sodium bisulfite 0.1 g.

[0053] To prepare the monomer raw material solution, add distilled water, acrylamide, sodium 2-acrylamido dodecyl sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate and sodium acrylate into the beaker and stir to dissolve, there is no order of addition , Stir evenly at room temperature and put into a three-necked flask.

[0054] The weighed potassium persulfate and sodium bisulfite are respectively configured into 5% potassium persulfate aqueous solution and 5% sodium bisulfite aqueous solution.

[0055] Nitrogen was passed through the aqueous monomer solution in the three-necked flask for 10 minutes, stirring was started, and the temperature was raised to 40°C. Aqueous potassium persulfate solution was added and s...

Embodiment 3

[0058] Weigh 200 grams of distilled water, 40 grams of acrylamide, 20 grams of sodium 2-acrylamido dodecylsulfonate, 20 grams of sodium 2-acrylamido-2-methylpropanesulfonate, 20 grams of sodium acrylate, persulfuric acid Potassium 0.2 grams, sodium bisulfite 0.2 grams.

[0059] To prepare the monomer raw material solution, add distilled water, acrylamide, sodium 2-acrylamido dodecyl sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate and sodium acrylate into the beaker and stir to dissolve, there is no order of addition , Stir evenly at room temperature and put into a three-necked flask.

[0060] The weighed potassium persulfate and sodium bisulfite are respectively configured into 5% potassium persulfate aqueous solution and 5% sodium bisulfite aqueous solution.

[0061]Nitrogen was passed through the aqueous monomer solution in the three-necked flask for 10 minutes, stirring was started, and the temperature was raised to 40°C. Aqueous potassium persulfate solution was...

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Abstract

The invention discloses a preparation method of a poly-surfactant for displacement of reservoir oil. The preparation method comprises the following steps: preparing an aqueous solution by using 20-40 parts of distilled water, 4-8 parts of acrylamide, 1-3 parts of 2-acrylamide sodium alkyl sulfonate, 1-3 parts of 2-acrylamide-2-sodium methallyl sulfonate and 1-3 parts of sodium acrylate, uniformly stirring at normal temperature, and then filling the solution into three flasks; introducing nitrogen into the single aqueous solution in the three flasks for 10-15 minutes, stirring, and heating to 30-40 DEG C; adding a potassium persulfate aqueous solution, stirring for 2-5 minutes, adding a sodium hydrogen sulfite aqueous solution, and stirring for 10-20 minutes; and stopping stirring, stopping introducing nitrogen, and performing constant-temperature polymerization for 6 hours. The poly-surfactant aqueous solution prepared by the method disclosed by the invention and crude oil have relatively low interfacial tension which can reach 10<-1> mN / m, and the viscosity retention rate at 95 DEG C after 7 days is over 80%.

Description

technical field [0001] The invention relates to a preparation method of a surface-polymerizing agent for oil displacement, which is used in tertiary oil recovery of petroleum exploitation to improve the efficiency of water displacement. Background technique [0002] Tertiary oil recovery is the main technical means of oil recovery. The mechanism of EOR chemical flooding is to increase the viscosity of the injected displacement fluid, thereby increasing the swept volume of water flooding. In addition, adding surfactants, such as petroleum sulfonate, can improve the oil washing efficiency. Adding polymer and surfactant to the oilfield injection water at the same time is the polymer-surfactant binary flooding technology. Polymer-surface binary flooding technology can greatly increase oil recovery, which is more than 18% higher than water flooding. [0003] Polymer surfactants, referred to as "polymer surfactants", are usually products obtained by polymerizing surface-active ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C09K8/584C09K8/588
Inventor 雷齐玲葛红江杨卫华程静刘念英任丽华杨敏游亮
Owner PETROCHINA CO LTD
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