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Temperature-resistant salt-resistant acrylamide terpolymer sulfonate oil-displacing agent and synthesis

An oil-displacing agent, temperature-resistant and salt-resistant technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large viscosity loss, poor mechanical shear stability, limitations, etc., achieve viscosity increase, good durability Temperature and salt resistance, shear resistance, and rigidity-enhancing effects

Inactive Publication Date: 2013-09-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Partially hydrolyzed polyacrylamide (HPAM) is a water-soluble polymer commonly used in polymer flooding. However, HPAM has a large viscosity loss, easy degradation, and hydrolysis under high salinity, high temperature, and high salinity reservoir conditions. , poor mechanical shear stability, which limits its application to a large extent

Method used

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  • Temperature-resistant salt-resistant acrylamide terpolymer sulfonate oil-displacing agent and synthesis
  • Temperature-resistant salt-resistant acrylamide terpolymer sulfonate oil-displacing agent and synthesis
  • Temperature-resistant salt-resistant acrylamide terpolymer sulfonate oil-displacing agent and synthesis

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of tetrapolymer AM / NaAA / NAP / AMPS

[0027] According to the ratio in Table 1, first weigh acrylic acid and dilute it with 10g deionized water, slowly add sodium hydroxide in an ice bath, and cool to room temperature; add NAP to a 250mL three-necked flask, then add OP-10 and 10g deionized water, After fully stirring, add AM and AMPS after the emulsification is complete, then add sodium acrylate solution, adjust the pH to 7 with NaOH solution, and pass nitrogen for 20 minutes; then add initiator sodium bisulfite solution, then add ammonium persulfate solution, and pass nitrogen for 10 minutes , reacted at a temperature of 40-50°C for 10h; finally washed three times with absolute ethanol, pulverized, and dried at a constant temperature of 40°C to obtain the AM / NaAA / NAP / AMPS tetrapolymer.

[0028] Table 1 Addition amount of quaternary polymer synthetic drugs

[0029]

Embodiment 2

[0030] Embodiment 2: AM / NaAA / NAP / AMPS tetrapolymer structure characterization

[0031] The infrared spectrogram of the tetrapolymer AM / NaAA / NAP / AMPS synthesized by embodiment 1 is as follows figure 1 shown. From the figure, we know that 3430cm -1 Attributed to O-H stretching vibration, N-H stretching vibration at 3200cm -1 ,-CH 2 CH 3 The C-H stretching vibration peaks on the group are respectively at 2926cm -1 and 2856cm -1 at 1620cm -1 , 1563cm -1 It is the absorption peak of benzene ring; -C=O stretching vibration peak is at 1658cm -1 , 1184cm -1 and 1043cm -1 Corresponds to -SO 3 - The peak of the group, through the analysis of the absorption peak of the above infrared spectrum, it can be determined that the substance is consistent with the target product.

Embodiment 3

[0032] Embodiment 3: AM / NaAA / NAP / AMPS tetrapolymer solution apparent viscosity and concentration relation investigation

[0033]The tetrapolymer AM / NaAA / NAP / AMPS synthesized in Example 1 was formulated into a solution of 0.1 to 1 wt%, and the apparent viscosity of the solution was measured at 30°C. The experimental results were as follows: figure 2 shown. From figure 2 It can be obtained: when the concentration of the polymer solution is 200mg / L, the apparent viscosity is 53mPa·s; when the concentration is 600mg / L, the apparent viscosity is 148mPa·s; when the concentration is 1000mg / L, the apparent viscosity is 243mPa·s, As the concentration increases, the viscosity rises faster, so the tetrapolymer has better viscosity-increasing properties.

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Abstract

The invention relates to a water-soluble sulfonate polymer oil-displacing agent and a preparation method thereof. According to the technical scheme, monomers are as follows in percentage by weight: 57.0-59.8% of acrylamide AM, 39.3-40.0% of sodium acrylate NaAA, 0.1-0.2% of N-phenyl acrylamide NAP, and 0.1-3.5% of 2-acrylamide-2-methylpropane sulfonic acid AMPS. The preparation method comprises the steps of firstly adding NAP into a reactor to finally prepare an aqueous solution with total monomer mass percentage concentration of 15-25wt%; then adding OP-10 and water, entirely emulsifying and then adding AM, NaAA and NaOH to prepare a solution with total monomer mass percentage concentration of 10-25%, regulating the pH to be 7-9, leading in N2 for 20min; then adding an initiator, continuing leading in N2 for 20min, and reacting for 4-12h at 40-55 DEG C; washing with absolute ethyl alcohol, grinding and drying to obtain an AM / NaAA / NAP / AMPS quadripolymer. The quadripolymer has water solubility, has better temperature resistance and salt resistance as well as shearing resistance, and the enhanced oil recovery rate simulated by the quadripolymer can achieve 13%.

Description

technical field [0001] The invention relates to a water-soluble polymer oil displacement agent used for tertiary oil recovery in the petroleum industry to enhance oil recovery and a preparation method thereof. Background technique [0002] Petroleum is one of the most versatile but finite energy resources. Under the situation that our country's energy resources are becoming increasingly tense, enhancing oil recovery has become a major issue in oil exploitation. Among them, polymer flooding is an important method to enhance oil recovery. Partially hydrolyzed polyacrylamide (HPAM) is a water-soluble polymer commonly used in polymer flooding. However, HPAM has a large viscosity loss, easy degradation, and hydrolysis under high salinity, high temperature, high salinity and other reservoir conditions. , poor mechanical shear stability, which greatly limits its application. [0003] Since the 1980s, a large number of researchers at home and abroad have proposed several ways to ...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F220/54C08F220/58
Inventor 刘钊许莉雯黄紫妍苟光俊叶仲斌苟绍华
Owner SOUTHWEST PETROLEUM UNIV
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