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Oil displacing agent containing imidazole ring quaternary ammonium salt polymer and preparation method

A technology of polymer and oil-displacing agent, which is applied in the field of imidazole ring-containing quaternary ammonium salt polymer oil-displacing agent and its preparation, can solve the problems of less research on imidazole ring-containing polymers and oil-displacing agent, and achieves increased rigidity and increased water solubility. The effect of increasing the stability and thermal stability

Inactive Publication Date: 2013-10-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Shi Zeshi, Takeda Nao, Kaneko Yasushi, etc. Imidazole derivatives or their salts [P]. Chinese Patent: 1462270, 2003-12-17; Gou Weijun, Liu Xinqi. Characterization of ionic liquids and their application in organic Application in synthesis [J]. Journal of Zhongzhou University, 2007, 2(24): 116-118.] However, there are relatively few studies on polymers and oil displacement agents containing imidazole rings

Method used

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  • Oil displacing agent containing imidazole ring quaternary ammonium salt polymer and preparation method
  • Oil displacing agent containing imidazole ring quaternary ammonium salt polymer and preparation method
  • Oil displacing agent containing imidazole ring quaternary ammonium salt polymer and preparation method

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Embodiment 1

[0020] Embodiment 1: the preparation of AOAB monomer

[0021] Add 14.1g of oleic acid into the reactor, slowly add 3.4g of phosphorus trichloride under stirring, the feeding temperature is controlled at 10°C, after the addition is completed, the temperature is raised to 55°C, and the lower layer is separated after 6 hours of heat preservation, and the upper layer is removed by evaporation. Unreacted phosphorus trichloride, yield oleoyl chloride with a yield of 99.5%; then dilute 5.0 g of oleoyl chloride prepared in the previous step with tetrahydrofuran solvent and put it into a constant pressure dropping funnel for later use, and add Dissolve 2.0g of imidazole with tetrahydrofuran solvent, then add 0.74gNaH as a catalyst, slowly drip the above-mentioned liquid for use under stirring, then react with a reflux device at 35°C for 10h, wash the reaction solution with water, and wash with 2% sodium hydroxide Wash, wash with saturated salt water, dry and filter, and obtain N-oleoyl...

Embodiment 2

[0022] Embodiment 2: the preparation of polymer AM / AA / AOAB

[0023] First weigh AA and NaOH according to the ratio in Table 1, put them into a 250mL three-necked flask and dissolve them with deionized water, cool to room temperature, add AM and AOAB, and dissolve them completely at room temperature, then adjust the pH of the system to 8 with NaOH solution , blow nitrogen for 20 minutes, add the pre-prepared sodium bisulfite solution, stir for 5 minutes, add ammonium persulfate solution, continue to pass nitrogen for 20 minutes, seal the reaction at a constant temperature of 45 ° C for 12 hours, wash with absolute ethanol precipitation three times, and The precipitate was crushed into small particles, soaked in absolute ethanol for 2 days, and dried at a temperature of 40° C. for 2 days to obtain the polymer AM / AA / AOAB.

[0024] Table 1 Polymer Preparation Drug Dosage

[0025]

Embodiment 3

[0026] Embodiment 3: AM / AA / AOAB copolymer structural characterization

[0027] The infrared spectrogram of the prepared polymer AM / AA / AOAB of embodiment 2 is as figure 1 shown. It is known from the picture that 2923cm -1 and 2846cm -1 for C-H (-CH 3 and -CH 2 -) stretching vibration, -N-H (-NH 2 ) stretching vibration peak at 3430cm -1 , the -C=O stretching vibration peak is at 1665cm -1 .

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Abstract

The invention relates to an oil displacing agent containing an imidazole ring quaternary ammonium salt polymer for increasing the recovery ratio in oil fields and a preparation method. The polymer has good temperature resistance and salt tolerance capacity and shear resistance performance. The technical scheme of the oil displacing agent is as follows: the oil displacing agent comprises the following raw material monomers according to the mass percentage (gram is taken as the unit of mass): 59.5-79.5% of acrylamide AM, 20.4-39.5% of acrylic acid AA, and 0.1-1% of 1-allyl-3-oil acyloxy imidazole-1-ammonium bromide AOAB; the preparation method comprises the following steps of: firstly adding 10g of water in a flask, then adding 2.0g of AA and 1.1g of NaOH, adding 0.0453g of AOAB and 8.0g of AM after dissolving, adjusting pH to be 6-8, preparing into 10-20% of aqueous solution, and feeding nitrogen for 20min; then adding an initiator, continuously feeding the nitrogen for 10-20min, and reacting for 5-12h at the temperature of 30-70 DEG C; and finally, washing by using anhydrous ethyl alcohol, smashing and drying, and preparing the AM / AA / AOAB polymer. The polymer has better water solubility, temperature resistance, salt tolerance and shear resistance performance; and the indoor rock core flow test shows that the oil displacing agent can increase the recover rate of simulated crude oil by 8.9%.

Description

technical field [0001] The invention relates to an imidazole ring-containing quaternary ammonium salt polymer oil displacement agent for enhancing crude oil recovery in oil fields and a preparation method thereof. Background technique [0002] At present, most oil fields at home and abroad have entered or are about to enter the stage of tertiary oil recovery (EOR). Generally, polymer flooding agents used in oil fields for tertiary oil recovery are mainly polyacrylamide (PAM) and partially hydrolyzed polyacrylamide (HPAM). However, PAM or HPAM at high shear, high salinity (Ca 2+ , Mg 2+ etc.), high temperature and other conditions, it is easy to hydrolyze, degrade, chain curl, etc., so that the viscosity of PAM or HPAM drops sharply and cannot meet the requirements of engineering construction. Therefore, it is particularly important to research and develop a polymer oil displacement agent with special properties such as shear resistance, high temperature resistance, and sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F220/56C08F220/06C08F226/06
Inventor 叶仲斌封明明苟绍华蒋文超陈洪
Owner SOUTHWEST PETROLEUM UNIV
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