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Temperature-resistance salt-tolerance macromolecular surfactant for oil field, preparation method and application thereof

A surfactant, temperature-resistant and salt-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of accelerated precipitation formation, poor shear stability, and reduced viscosity of aqueous solution, and solve the chromatographic separation effect Problems, overcome the effect of poor temperature and salt resistance, high surface activity and

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylamide has the following disadvantages: ① poor shear stability, easy to degrade under shear conditions
②Poor salt tolerance, in high salinity water, the carboxyl group on the molecular chain is extremely sensitive to salt, especially when encountering high-valent metal ions, the solution viscosity drops rapidly, and even precipitation occurs
③ Poor thermal stability, easy to hydrolyze at high temperature (temperature > 70°C), after hydrolysis, phase separation often occurs in the oil layer w

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1

In the first step, 4 g of sodium cellulose sulfate was fully dissolved in 50 ml of double distilled water, and then added to a three-necked flask equipped with a stirrer, a thermometer, and a dropping funnel. 2.4 g (0.03 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise and stirred at 35°C for 1.5 hours. After dissolving 5 g of bromododecane (0.02 mol) in 50 ml of N,N-dimethylformamide, it was dropped into a three-necked flask, and the reaction was stirred at 70° C. for 2 hours. After cooling to room temperature, it was added to 200ml ethanol for precipitation, filtered and separated to obtain a crude product, and then recrystallized with ethanol. The purified product was vacuum dried at 60°C to obtain sulfated cellulose lauryl ether.

In the second step, 4g of sulfated cellulose lauryl ether and 50ml of distilled water were added to a three-necked flask equipped with a stirrer, a thermometer, and a nitrogen tube, and nitrog...

Example Embodiment

Example 2:

In the first step, 4 g of sodium cellulose sulfate was fully dissolved in 50 ml of double distilled water, and then added to a three-necked flask equipped with a stirrer, a thermometer, and a dropping funnel. 2.4 g (0.03 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise, and the mixture was stirred at 40°C for 2 hours. After dissolving 4.7 g of bromoundecane (0.02 mol) in 50 ml of N,N-dimethylformamide, it was dropped into a three-necked flask, and the reaction was stirred at 70°C for 3 hours. After cooling to room temperature, it was added to 200ml ethanol for precipitation, filtered and separated to obtain a crude product, and then recrystallized with ethanol. The purified product was vacuum dried at 60°C to obtain sulfated cellulose undecyl ether.

In the second step, add 4 g of sulfated cellulose undecyl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer and a nitrogen tu...

Example Embodiment

Example 3

In the first step, 4 g of sodium cellulose sulfate was fully dissolved in 50 ml of double distilled water, and then added to a three-necked flask equipped with a stirrer, a thermometer, and a dropping funnel. 1.6 g (0.02 mol) of sodium hydroxide aqueous solution with a mass concentration of 50% was added dropwise, and the mixture was stirred at 40°C for 1 hour. After dissolving 6.2 g of bromononane (0.03 mol) in 50 ml of N,N-dimethylformamide, it was added dropwise to a three-necked flask, and the reaction was stirred at 50° C. for 1.5 hours. After cooling to room temperature, it was added to 200ml ethanol for precipitation, filtered and separated to obtain a crude product, and then recrystallized with ethanol. The purified product was vacuum dried at 60°C to obtain sulfated cellulose nonyl ether.

In the second step, add 4 g of sulfated cellulose decyl ether and 50 ml of distilled water into a three-necked flask equipped with a stirrer, a thermometer and a nitrogen t...

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Abstract

The invention relates to a temperature-resistance salt-tolerance macromolecular surfactant for an oil field, a preparation method and an application thereof. In the preparation method, sodium cellulose sulfate is hydrophobically modified, and subjected to graft polymerization with acrylamide and 2-acrylamido-2-sodium methylacrylsulfonate to synthesize the temperature-resistance salt-tolerance macromolecular surfactant. The macromolecular surfactant is integrated with high surface activity of the modified cellulose, high viscosity increasing property of acrylamide and temperature resistance and salt-tolerance of 2-acrylamido-2-sodium methylacryl sulfonate, can greatly reduce the oil-water interfacial tension while enlarging waves and coefficients to solve the problems of chromatographic fractionation effect of polymer-surfactant combination flooding in the prior art, can be either independently used as an oil displacement agent or compounded with alkali in a binary compound flooding, or used with a polymer; and the macromolecular surfactant has unique temperature resistance and salt tolerance, and can be used for high-temperature high mineralization oil deposit, so that the crude oil recovery rate can be remarkably improved.

Description

technical field The present invention relates to a polymer surfactant and its synthesis, in particular to the temperature-resistant and salt-resistant polymer surfactant sulfated cellulose ether-acrylamide-2-acrylamide-2-methylpropanesulfonate sodium graft Copolymers and methods for their preparation. The present invention also relates to the application of the above-mentioned temperature-resistant and salt-resistant polymer surfactant. Background technique As an tertiary oil recovery technology, chemical composite flooding is to add chemical agents such as alkali, surfactant and polymer to the injected water, and use the good synergistic effect between the chemical agents to greatly increase oil recovery. Among them, surfactants can reduce the interfacial tension of oil and water, increase the solubility of crude oil, and change the wettability, while polymers can increase the sweep coefficient, resulting in increased recovery. At present, the polymer widely used in tert...

Claims

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Application Information

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IPC IPC(8): C09K8/584C08F251/02C08F220/56C08F220/58
Inventor 于芳吴江勇陈锡荣赵方园张增丽许春梅张天宇
Owner CHINA PETROLEUM & CHEM CORP
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