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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 anti-aging stability, poor temperature resistance, and short validity period

Inactive Publication Date: 2011-11-23
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Effect test

Embodiment 1

[0028] Dissolve 20.000 grams of acrylamide, 8.042 grams of acrylic acid, and 1.800 grams of 4-vinylbenzyloctylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 40) in 380 mL of distilled water, add them to a three-necked reaction flask, and use NaOH adjusts the pH of the solution to 8, the reaction temperature is 65°C, and N 2 After 30 minutes, add 6.50 mL of 0.05 mol / L potassium persulfate initiator solution, react for 32 hours, and dilute the polymer with water to obtain a concentrated PAE solution. Take a certain amount of polymer PAE to prepare an oil displacement agent aqueous solution sample, and the sample is colorless and transparent. Add an aqueous solution with a polymer concentration of 0.5g / L, an aluminum citrate concentration of 0.15g / L, a sodium dodecylbenzenesulfonate concentration of 0.3mmol / L, and a sodium sulfite concentration of 0.03g / L, and add a stirring device In a mixing container, stir evenly at room temperature, adjust the pH of ...

Embodiment 2

[0030] 20.000 grams of acrylamide, 6.300 grams of 2-acrylamido-2-methylpropanesulfonic acid, 9.500 grams of 4-vinylbenzyl octylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 20) Dissolve in 120mL distilled water, add to a three-necked reaction flask, adjust the pH of the solution to 7 with NaOH, the reaction temperature is 60°C, and pass through N 2 After 30 minutes, add 5.20 mL of 0.05 mol / L potassium persulfate initiator solution, react for 32 hours, and dilute the polymer with water to obtain a concentrated PAE solution. Take a certain amount of polymer PAE to prepare an oil displacement agent aqueous solution sample, and the sample is colorless and transparent. The concentration of the 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, adju...

Embodiment 3

[0032] 20.000 grams of acrylamide, 5.100 grams of 3-acrylimido-3-methylbutanoic acid, and 7.000 grams of allyl octylphenol polyoxyethylene ether (the adduct EO of polyoxyethylene ether is 12) were dissolved in Add 630mL of distilled water into a three-necked reaction flask, adjust the pH of the solution to 5 with NaOH, the reaction temperature is 60°C, and pass through N 2 After 30 minutes, add 12.0 mL of 0.05 mol / L potassium persulfate initiator solution, react for 24 hours, and dilute the polymer with water to obtain a concentrated PAE solution. Take a certain amount of polymer PAE to prepare an oil displacement agent aqueous solution sample, and the sample is 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 aqueous solution of sodium sulfite concentration is 0.03g / L, add Stir evenly at room temperature in a mixing vessel ...

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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 oil field chemistry. 2. Technical background [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 The aging stability is poor and the validity period is short. Therefore, the application of HPAM gel system in high temperature and high salinity oil reservoirs is limited. In addition, the polymer HPAM has an ultra-high molecular weight and a large molecular chain size, so it is pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08F220/56C08F220/06C08F220/52C08F228/02C08F222/02C08F220/34C08F220/60C08F236/02C09K8/588
CPCC08F220/56C08F220/28C08F216/1416C09K8/588C08F226/04C08F220/06C08F220/34C08F216/1433C08F220/286
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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