Initiator composition used for synthesizing polyacrylamide capable of displacing oil

A polyacrylamide and initiator technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult to meet the requirements of polymers for tertiary oil recovery, low molecular weight of polyacrylamide, and poor temperature and salt resistance. , to achieve the effect of uniform chain growth, reduced polymerization reaction speed, and good temperature resistance and salt resistance.

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the polyacrylamide synthesized in the prior art has a low molecular weight, poor heat resistance and salt resistance, and is difficult to meet the technical requirements of polymers for tertiary oil recovery. Initiator composition of polyacrylamide for oil displacement

Method used

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  • Initiator composition used for synthesizing polyacrylamide capable of displacing oil

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Experimental program
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Effect test

Embodiment 1

[0011] First add 125g of acrylamide (AM) into 352g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30 min, 10 g of 1.25% aqueous urea solution, 10 g of 0.9% disodium ethylenediaminetetraacetic acid (EDTA-disodium) aqueous solution, 1 g of 1.25% N,N-dimethylaminoethyl methacrylate (DMAEMA) aqueous solution were added successively, 1.25% potassium persulfate aqueous solution 1g, 1% sodium bisulfite aqueous solution 1g, after 1 hour, the reaction temperature was gradually raised to 40 ° C, after 4 hours of reaction, a gel-like polymer product was obtained, after cutting the gel, add 10% NaOH aqueous solution 140g, hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6h, crushed and sieved with a pulverizer, then sampled for analysis.

[0012] According to GB / T12005.2-89 polyacrylamide solid content determination method, th...

Embodiment 2

[0014] First add 125g of acrylamide (AM) into 370g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30 min, add 1.25% thiourea aqueous solution 1g, 0.81% ethylenediaminetetraacetic acid disodium (EDTA-disodium) aqueous solution 1g, 1.25% β-dimethylaminopropionitrile aqueous solution 1g, 1.25% sodium persulfate aqueous solution 1g, 1g of 1.69% potassium sulfite aqueous solution, after 1 hour, the reaction temperature was gradually raised to 40°C, and after 4 hours of reaction, a gel-like polymer product was obtained. After the gel was cut, 140g of 10% NaOH aqueous solution was added, and the reaction was hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6 hours, crushed and sieved with a pulverizer, and then sampled for analysis.

[0015] According to GB / T12005.2-89 polyacrylamide solid content determination method, th...

Embodiment 3

[0017]First add 125g of acrylamide (AM) into 370g of deionized water, stir and dissolve evenly, adjust the pH value to 8 with 5% NaOH solution, and cool the water bath to 15°C, then start to pass high-purity nitrogen gas into it. After nitrogen for 30min, add 1.38% urea aqueous solution 1g, 0.33% ethylenediaminetetraacetic acid disodium (EDTA-disodium) aqueous solution 1g, 0.99% N, N-dimethyl diallyl ammonium chloride aqueous solution 1g, 1.25 % ammonium persulfate aqueous solution 1g, 2.63% potassium sulfite aqueous solution 1g, after 1 hour, the reaction temperature was gradually raised to 40°C, and after 4 hours of reaction, a gel-like polymer product was obtained, and 140g of 10% NaOH aqueous solution was added after cutting the glue, It was hydrolyzed at 90°C for 2 hours, then vacuum-dried at 75°C for 6 hours, crushed and sieved with a pulverizer, and then sampled for analysis.

[0018] According to GB / T12005.2-89 polyacrylamide solid content determination method, the sol...

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Abstract

The invention relates to an initiator composition used for synthesizing polyacrylamide capable of displacing oil, which mainly solves the problems of low polyacrylamide molecular weight, poor heat resistance and salt resistance performances and difficult satisfaction for technical requirement of tertiary oil extraction. The initiator composition used for synthesizing polyacrylamide capable of displacing oil comprises the following ingredients by weight percentage: (a) 0.5-20% of persulfate; (b) 0.1-40% of sulfite or acid sulfite; (c) 0.5-20% of NR1R2R3-represented trialkylamine compounds or N<+>R4R5R6R7-represented quaternary ammonium compounds or NH2R8-represented aliphatic amine compounds, wherein R1-R7 in the formula are selected from C1-C14 straight chain or branched chain alkyl or alkyl derivatives, R8 is selected from straight chain or branched chain alkyl or alkyl derivatives; (d) 10-80% of urea, thiourea or ammonia liquor; (e) 5-60% of ethylenediaminetetraacetic acid. The technical scheme of the invention better solves the problems and can be used in industrial production of oil displacement.

Description

technical field [0001] The invention relates to an initiator composition for synthesizing polyacrylamide for oil displacement. Background technique [0002] Polyacrylamide (PAM) is a homopolymer and copolymer of acrylamide and its derivatives, and is a linear water-soluble polymer. Polyacrylamide has a variety of excellent properties, such as flocculation, viscosity increasing, thickening, surface activity, water loss reducing, friction reducing and other characteristics, therefore, it occupies the most important position in industrial applications and is widely used Used in drilling, oil production, water plugging, profile control, acidizing, fracturing, water treatment and other fields. At present, after primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/56C08F4/40C09K8/588
Inventor 宋晓芳夏燕敏陈安猛蔡红
Owner CHINA PETROLEUM & CHEM CORP
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