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Water-soluble tracing polymer oil displacement agent and preparation method thereof

A technology of polymer and oil-displacing agent, applied in the field of water-soluble tracer polymer oil-displacing agent and its preparation, can solve the problems such as no literature report, and achieve viscosity increase, good temperature and salt resistance and shear resistance , the effect of rigidity enhancement

Inactive Publication Date: 2012-03-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there are almost no literature reports on the use of tracer polymers in the oil field to monitor the concentration of polymers in production wells in real time and accurately.

Method used

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  • Water-soluble tracing polymer oil displacement agent and preparation method thereof
  • Water-soluble tracing polymer oil displacement agent and preparation method thereof
  • Water-soluble tracing polymer oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The synthesis of embodiment 1 AM / NaAA / AMCO polymer

[0021] Add 0.0108 g AMCO, 0.001 g OP-10 emulsifier and 20 g deionized water into a 100 mL single-necked bottle equipped with electromagnetic stirring, stir well and add 8.0 g acrylamide, 2.0 g acrylic acid and 1.11 g hydroxide Sodium, made into a 20% aqueous solution of the total mass percentage concentration of the monomer, adjusting the pH of the system to be 8, and passing N 2 20 min; then add initiator ammonium persulfate solution and sodium bisulfite solution, the ratio of ammonium persulfate to sodium bisulfite is 1:1, the amount added is 1% of the total mass of the monomer, continue Access to N 2 20 min, react at a temperature of 50°C for 8h, after the reaction, the polymer is purified with absolute ethanol, the precipitate is cut into small particles, and dried at 40°C for 2 days to obtain AM / NaAA / AMCO polymer, AM / NaAA / AMCO polymer The amount of medicine required for synthesis is shown in Table 1 below: ...

Embodiment 2

[0024] Structural characterization of embodiment 2 AM / NaAA / AMCO polymer

[0025] The infrared spectrogram of the polymer AM / NaAA / AMCO of embodiment 1 is as figure 1 As shown, it is known from the figure that N-H (-NH 2 ) stretching vibration peak at 3423.99cm -1 , the -C=O stretching vibration peak is at 1670.80cm -1, C-O (C-O-C) stretching vibration peak at 1121.40 cm -1 place.

Embodiment 3

[0026] Embodiment 3 The relationship between the fluorescent intensity of AM / NaAA / AMCO polymer and its concentration

[0027] Under the condition that the excitation wavelength and emission wavelength of AM / NaAA / AMCO polymer are 321nm and 383nm respectively, the emission spectrum of AM / NaAA / AMCO polymer with a concentration of 40-1000 ppm is scanned as figure 2 shown by figure 2 It can be seen that the relative fluorescence intensity of the polymer increases with the increase of its mass concentration, and the relationship between the concentration of AM / NaAA / AMCO polymer and its fluorescence intensity is as follows: image 3 shown by image 3 It is known that the concentration of the polymer has a good linear relationship with its fluorescence intensity, the linear relationship is y=5.81013+0.58817x, and the linear relationship coefficient can reach 0.99955, indicating that the fluorescence intensity of the AM / NaAA / AMCO polymer can be directly measured. polymer concentr...

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Abstract

The invention relates to a water-soluble tracing polymer oil displacement agent for increasing the crude oil recovery rate in oil fields and a preparation method thereof. In the technical scheme, the used materials and the weight percentage of each monomer are as follows: 70 to 79.9 percent of acrylamide AM, 20 to 28 percent of sodium acrylate NaAA and 0.1 to 2 percent of allyl-7-hydroxy-4-methylcoumarin AMCO; and the preparation method for the water-soluble tracing polymer oil displacement agent includes the following steps: the AMCO, OP-10 emulsifier and water are added into a reaction bottle, the AM, crylic acid and NaOH are added after emulsification, so that aqueous solution with 15 to 25 percent of monomer concentration is prepared, pH is regulated to 7 to 11, and N2 is filled for 20 minutes; initiator is then added, N2 continues to be filled for 20 minutes, and reaction is carried out under 30 DEG C to 70 DEG C for 4 to 12 hours; and finally, after absolute ethyl alcohol washing, grinding and drying, AM / NaAA / AMCO polymer is prepared. The product is water-soluble and fluorescent, and shows good temperature tolerance, salt tolerance and shear resistance, and the result of an indoor simulated oil displacement experiment indicates that the polymer can effectively increase the crude oil recovery rate.

Description

technical field [0001] The invention relates to a water-soluble tracer polymer oil-displacing agent used for tertiary oil recovery in oil fields and capable of improving crude oil recovery and a preparation method thereof. Background technique [0002] Polyacrylamide polymers have excellent properties such as good temperature resistance, salt resistance, and shear resistance, and have great application potential in fields such as enhanced oil recovery. Therefore, the exploration of this type of polymer has become the field of water-soluble polymers. It is one of the high-profile topics and is also a research hotspot in industry and academia. However, there are still many problems in the practical application of this type of polymer. For example, after the polymer is injected into the oil layer, it will undergo thermal degradation and further hydrolysis under high temperature conditions. , destroy the stability of the polymer, and greatly reduce the oil displacement effect of...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F216/14
Inventor 闫立伟彭春香叶仲斌
Owner SOUTHWEST PETROLEUM UNIV
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