Acrylic amide modified polymer micro-crosslinking gel and preparation thereof

A technology of micro-crosslinked gel and acrylamide, which is applied in the fields of polymer materials and oil field chemistry, and can solve problems such as poor salt resistance, short validity period, and low system elasticity

Inactive Publication Date: 2009-07-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Flowable weak gel flooding, weak gel profile control and strong gel water plugging technologies are important technologies for enhancing oil recovery, while the gel systems currently used in oil fields are mainly partially hydrolyzed polyacrylamide ( HPAM) gel, but the HPAM gel system has the following disadvantages: poor temperature resistance (below 80°C), poor salt resistance (below 10000mg / L), easy dehydration, low system elasticity, long-term resistance Poor aging stability and short validity period, therefore, the application of HPAM gel system in high temperature and high salinity reservoirs is limited
Liu Qingwang et al., Journal of Zhejiang University (Natural Science Edition), 2005, 32(3): 295-299, studied the composition and performance of cationic polyacrylamide weak gel modifier, and found that the concentration of 5g / L The highest gel viscosity after polymer gelation is 50000mPa.s, it can be seen that the amount of polymer used for gelation is relatively high

Method used

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  • Acrylic amide modified polymer micro-crosslinking gel and preparation thereof
  • Acrylic amide modified polymer micro-crosslinking gel and preparation thereof
  • Acrylic amide modified polymer micro-crosslinking gel and preparation thereof

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Experimental program
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Embodiment 1

[0028] Dissolve 20.000 g of acrylamide, 8.042 g of acrylic acid, and 1.800 g of 4-vinylbenzyl octylphenol polyoxyethylene ether (the adduct of polyoxyethylene ether is 40) in 380 mL of distilled water, add it to a three-necked reaction flask, and use The pH of the solution was adjusted to 8 with NaOH, the reaction temperature was 65 °C, and N was passed through. 2 30min, add 6.50mL of 0.05mol / L potassium persulfate initiator solution, react for 32h, dilute the polymer with water to obtain a concentrated PAE solution. A certain amount of polymer PAE was taken to prepare a sample of oil-displacing agent aqueous solution, and the sample was colorless and transparent. The polymer concentration was 0.5g / L, the aluminum citrate concentration was 0.15g / L, the sodium dodecylbenzenesulfonate concentration was 0.3mmol / L, and the sodium sulfite concentration was 0.03g / L. The aqueous solution was added with a stirring device. In the mixing container of , the solution is stirred evenly at...

Embodiment 2

[0030] Acrylamide 20.000 g, 2-acrylamido-2-methylpropanesulfonic acid 6.300 g, 4-vinylbenzyl octylphenol polyoxyethylene ether (polyoxyethylene ether adduct EO is 20) 9.500 g Dissolve in 120 mL of distilled water, add it into a three-necked reaction flask, adjust the pH of the solution with NaOH = 7, the reaction temperature is 60 ℃, pass N 2 30min, add 5.20mL of 0.05mol / L potassium persulfate initiator solution, react for 32h, dilute the polymer with water to obtain a concentrated PAE solution. A certain amount of polymer PAE was taken to prepare a sample of oil-displacing agent aqueous solution, and the sample was colorless and transparent. The concentration of polymer is 2.2g / L, the concentration of oligophenolic resin is 0.75g / L, the concentration of sodium dodecylbenzenesulfonate is 0.2mmol / L, and the concentration of sodium sulfite is 0.05g / L. In the mixing container of the device, stir evenly at room temperature, and adjust the pH of the solution to be 5-10 to obtain a...

Embodiment 3

[0032] Dissolve 20.000 g of acrylamide, 5.100 g of 3-acrylimido-3-methylbutyric acid, and 7.000 g of allyl octylphenol polyoxyethylene ether (the adduct of polyoxyethylene ether EO is 12) 630mL of distilled water was added to the three-necked reaction flask, the pH of the solution was adjusted to 5 with NaOH, the reaction temperature was 60°C, and the N 2 30min, add 12.0mL of 0.05mol / L potassium persulfate initiator solution, react for 24h, dilute the polymer with water to obtain a concentrated PAE solution. A certain amount of polymer PAE was taken to prepare a sample of oil-displacing agent aqueous solution, and the sample was colorless and transparent. The polymer concentration is 1.2g / L, the total concentration of phenol and glutaraldehyde is 0.25g / L, the concentration of sodium dodecylbenzenesulfonate is 0.2mmol / L, and the concentration of sodium sulfite is 0.03g / L. In a mixing container with a stirring device, stir evenly at room temperature, and adjust the pH of the so...

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Abstract

The invention discloses acrylamide modified polymer micro-crosslinking gel and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps that: acrylamide modified polymer PAE containing functional macro monomer is prepared into an aqueous solution with the concentration between 0.1 and 4g/L, the concentration of crosslinking agent between 0.01 and 1.0g/L, the concentration of surface active agent between 0.01 and 8mmol/L and the concentration of heat stabilizer sodium sulfite between 0.005 and 1.0g/L; the aqueous solution is added in a mixing container with a stirring device and is stirred evenly at room temperature; the pH value of the solution is adjusted between 4 and 11 to prepare a polymer solution system of the acrylamide modified polymer micro-crosslinking gel used for tertiary oil recovery and displacement, oil displacement modification, profile modification or water plugging; and the polymer solution system undergoes micro crosslinking during flowing inside an oil layer to form the gel. The acrylamide modified polymer micro-crosslinking gel has ideal elasticity, difficult dehydration, stable performance and excellent performances on tackifying, temperature resistance, salt resistance, shearing resistance and ageing resistance.

Description

1. Technical field [0001] The invention relates to an acrylamide-modified polymer micro-crosslinked gel and a preparation method thereof, belonging to the fields of polymer materials and oilfield chemistry. 2. Technical background [0002] Flowable weak gel oil flooding, weak gel flooding profile control and strong gel water plugging technology are important technologies to improve oil recovery, while the gel system currently used in oilfields is mainly partially hydrolyzed polyacrylamide ( HPAM) gel, but the HPAM gel system has the following shortcomings: poor temperature resistance (below 80°C), poor salt resistance (below 10000mg / L), easy dehydration, low system elasticity, long-term resistance The aging stability is poor and the validity period is short, so the application of HPAM gel system in high temperature and high salinity reservoirs is limited. In addition, the polymer HPAM has ultra-high molecular weight and large molecular chain size, which is prone to shear de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F220/56C08F220/06C08F220/52C08F228/02C08F222/02C08F220/34C08F220/60C08F236/02C09K8/588
CPCC08F226/04C08F220/56C08F220/28C08F216/1416C09K8/588C08F220/06C08F220/34C08F216/1433C08F220/286
Inventor 钟传蓉蒋留锋王世高彭绣花蒋笙翠
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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