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A temperature-resistant and salt-resistant hydrophobic association polymer oil displacement agent and its preparation method

A hydrophobic association, temperature-resistant and salt-resistant technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of polymer long-term stability to be strengthened, low viscosity retention rate, etc., to achieve low production cost, Good salt resistance, good temperature resistance and shear resistance

Inactive Publication Date: 2014-10-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, due to high temperature hydrolysis, the viscosity retention rate of the polymer solution is low, and the viscosity drops rapidly, so the long-term stability of the polymer needs to be strengthened.

Method used

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  • A temperature-resistant and salt-resistant hydrophobic association polymer oil displacement agent and its preparation method
  • A temperature-resistant and salt-resistant hydrophobic association polymer oil displacement agent and its preparation method
  • A temperature-resistant and salt-resistant hydrophobic association polymer oil displacement agent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of monomer NAPA

[0026] Add 1.63g allylamine, 4.00g triethylamine and 0.02g hydroquinone to a 150ml dry single-necked flask, dilute with dichloromethane solvent, and slowly dissolve the mixture with a constant pressure dropping funnel under ice bath and magnetic stirring 4. Add 41g of phenylacetyl chloride dropwise into the reactor, and control the dropping within half an hour; after the dropping, react at room temperature for 6 hours, and the reaction solution is washed with water, acid, alkali, saturated salt water, dried and filtered, and the solvent is evaporated to obtain a white Solid powder NAPA monomer with a yield of 99.8%.

Embodiment 2

[0027] Embodiment 2: the preparation of polymer AM / NaAA / NAPA / AHAC

[0028] Add the NAPA and AHAC prepared above into a 150ml three-necked flask according to the ratio in Table 1, then add OP-10 emulsifier and 10g deionized water, stir well at 30°C until the emulsification is complete; then weigh 10g of AA Dilute with deionized water, slowly add sodium hydroxide in an ice bath, stir and cool to room temperature; then add AM and NaAA to the flask, adjust the pH to 7 with 20% NaOH solution, and pass nitrogen for 20 minutes; then add the initiator bisulfite Add sodium solution, then add ammonium persulfate solution, pass nitrogen gas for 10 minutes, and react at a temperature of 40°C for 12 hours; finally wash with absolute ethanol until the polymer is completely precipitated, then pulverize the polymer, and dry at a constant temperature of 40°C to obtain AM / NaAA / NAPA / AHAC quaternary polymer.

[0029] Table 1 Quaternary polymer synthesis drug dosage

[0030]

Embodiment 3

[0031] Embodiment 3: polymer AM / NaAA / NAPA / AHAC terpolymer structural characterization

[0032] The infrared spectrogram of the tetrapolymer AM / NaAA / NAPA / AHAC synthesized by embodiment 2 is as follows figure 1 shown. From the figure, we know that 3416cm -1 The strong and broad absorption peak is attributed to the stretching vibration of -OH; 1456cm -1 The absorption peak at is due to -CH 3 The asymmetric in-plane bending vibration and -CH 2 -caused by the scissor vibration, 1389cm -1 The absorption peak at is due to -CH 3 caused by bending vibrations in the symmetric plane, while at 2937cm -1 and 2860cm -1 Two peaks appear, these all prove the existence of methyl group and methylene group; 3192cm -1 The strong absorption peak attributable to the N-H stretching vibration, 1672cm -1 The absorption peak at is attributed to -C=O stretching vibration, and these two peaks combine to confirm the existence of the amide structure; 1556cm -1 Stretching vibrations attributed to ...

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Abstract

The invention relates to a temperature and salt resistant hydrophobic association polymer oil displacement agent and its preparation method. The preparation scheme of the oil displacement agent is characterized in that the oil displacement agent comprises 57.0-59.8% (g / g) of acrylamide (AM), 39.3-40.0% (g / g) of sodium acrylate (NaAA), 0.1-0.2% (g / g) of N-allylphenylacetamide (NAPA), and 0.1-3.5% (g / g) of N,N-dimethyl-N-allylhexadecyl ammonium chloride (AHAC); and the preparation method comprises the following steps: adding the NAPA, the AHAC and an emulsifier into a reactor, adding water, and completely emulsifying; adding the NaAA and the AM, adjusting the pH value to 7, adding an initiator, reacting, washing, crushing, and drying to obtain a polymer product. The polymer has the characteristics of water solubility, high tackifying capability and high water and shear resistances. The viscosity reservation rate of the polymer solution having a concentration of 0.1wt% at 100DEG C reaches 91.3%, and the polymer can improve the simulation crude oil recovery efficiency by 16.6%.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant hydrophobic association polymer oil displacement agent used in the petroleum industry and a preparation method thereof. Background technique [0002] Petroleum still plays a key role in today's period of rapid social and economic development. The contradiction between increasing oil demand and decreasing oil reserves is becoming more and more prominent. However, about 60% of crude oil in domestic oil reservoirs cannot be exploited by conventional oil recovery technology, which restricts the development of national economy. In order to increase the oil production, the current widely used is the enhanced oil recovery (Enhanced Oil Recovery, EOR), one of the most important and one of the more mature methods is the polymer flooding in the tertiary oil recovery, the redevelopment of old oilfields To stabilize oil production, this technology has been applied in many domestic oil fields. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/02C09K8/588
Inventor 叶仲斌封明明苟绍华尹婷刘曼黄子妍郭利娟
Owner SOUTHWEST PETROLEUM UNIV
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