Hydrophobic association micro-crosslinking polymer oil displacement agent and preparation method thereof

A technology of hydrophobic association and micro-crosslinking, applied in the fields of polymer materials and oilfield chemistry, can solve the problems of loss of hydrophobic association function, decrease of solution viscosity, destruction of hydrophobic association, etc. Aging, increasing molecular weight and rigidity, enhancing effect of hydrophobic association

Inactive Publication Date: 2008-03-26
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Geng Tongmou et al., Fine Chemical Industry 2006, 23 (8): 747-751, synthesized a ternary hydrophobic association water-soluble polymer poly(acrylamide/sodium acrylate/N, N-diallyltetradecylamine (P( AM/NaAA/DiAC 14 ), and studied its solution properties, but the critical association concentration of the copolymer is relatively high, and the apparent viscosity of the solution at a mass concentration of 4g/L is still not high, and with the increase of temperature, the thermal movement of molecules is intensified , the hydrophobic association between molecules is severely damaged, and the solution viscosity drops significantly
In addition, most of the current hydrophobic monomers are hydrolyzed at a temperature higher than 80 ° C, resulting in the loss of their hydrophobic association function, making the anti-aging performance of the polymer solution poor
Moreover, although this type of...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 5.000 grams of acrylamide, 3.042 grams of acrylic acid, 0.831 grams of p-tert-butylstyrene and 8.830 grams of sodium lauryl sulfate in 126.2 mL of distilled water, add them to a three-necked reaction flask, adjust the pH of the solution to 8 with NaOH, and the reaction temperature is 50 ℃, through N 2 After 30 minutes, add 1.33 mL of 0.05 mol / L potassium persulfate initiator solution, react for 16 hours, and dilute the polymer with water to obtain a PAAT concentrated solution. A certain amount of PAAT hydrophobic association polymer was taken to prepare an oil displacement agent aqueous solution sample, and the sample was colorless and transparent. The concentration of the polymer is 0.6g / L, the concentration of aluminum citrate is 0.15g / L, the concentration of sodium dodecylbenzenesulfonate is 0.3mmol / L, and the concentration of thiourea is 0.03g / L. In the mixing container of the device, stir evenly at room temperature, adjust the pH of the solution to 5-10, ...

Embodiment 2

[0025] Dissolve 5.000 grams of acrylamide, 1.530 grams of 2-acrylamido-2-methylpropanesulfonic acid, 0.750 grams of p-butylstyrene and 6.760 grams of sodium lauryl sulfate in 104.00 mL of distilled water, and add them to a three-necked reaction flask , use NaOH to adjust the pH of the solution to 8, the reaction temperature is 50°C, and N 2 After 30 minutes, add 0.856 mL of 0.05 mol / L potassium persulfate initiator solution, react for 16 hours, and dilute the polymer with water to obtain a PAAT concentrated solution. A certain amount of PAAT hydrophobic association polymer was taken to prepare an oil displacement agent aqueous solution sample, and the sample was colorless and transparent. The polymer concentration is 0.5g / L, the oligomeric phenolic resin concentration is 0.2g / L, the sodium dodecylbenzenesulfonate concentration is 0.3mmol / L, and the aqueous solution of 0.05g / L thiourea concentration is added with Stir evenly at room temperature in a mixing container of a stirr...

Embodiment 3

[0027] Dissolve 5.000 grams of acrylamide, 1.210 grams of 2-acrylamido-2-methylpropanesulfonic acid, 0.550 grams of styrene and 5.070 grams of sodium lauryl sulfate in 84.5 mL of distilled water, add them to a three-necked reaction flask, and adjust with NaOH Solution pH=8, reaction temperature 50°C, pass N 2 After 30 minutes, add 0.800 mL of 0.05 mol / L potassium persulfate initiator solution, react for 16 hours, and dilute the polymer with water to obtain a PAAT concentrated solution. A certain amount of PAAT hydrophobic association polymer was taken to prepare an oil displacement agent aqueous solution sample, and the sample was colorless and transparent. The concentration of the polymer is 0.6g / L, the concentration of chromium butyrate is 0.25g / L, the concentration of trimethylhexadecyl ammonium bromide is 0.2mmol / L, and the concentration of thiourea is 0.05g / L. Stir evenly at room temperature in a mixing container of a stirring device, adjust the pH of the solution to 5-1...

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Abstract

The present invention discloses one kind of hydrophobic associated and micro cross-linking polymer oil displacing agent and its preparation process. The hydrophobic associated and micro cross-linking polymer oil displacing agent is prepared through compounding water solution of water soluble hydrophobic associated copolymer of acrylamide/(vinyl benzene sulfonic acid and/or 2-acryl amido-2-methyl propyl sulfonic acid)/(C0-C18 alkyl styrene and/or p-phenyl styrene) in 0.1-2 g/l concentration, cross-linking agent solution in 0.01-1.0 g/l concentration, surfactant solution in 0.01-8 mmol/l concentration and solution of heat stabilizer thiourea in 0.005-1.0 g/l concentration; mixing in a mixer with stirrer and regulating the solution pH to 4-11 to obtain the polymer oil displacing agent. The polymer oil displacing agent cross links during flowing in oil reservoir to increase solution viscosity, and has excellent application foreground in oil reservoir development.

Description

1. Technical field [0001] The invention relates to a hydrophobic association cross-linked polymer oil displacement agent and a preparation method thereof, belonging to the fields of polymer materials and oil field chemistry. 2. Technical background [0002] Polymer flooding is one of the important technologies for enhancing oil recovery, and the polymer oil flooding agent currently used in industry is still mainly partially hydrolyzed ultra-high molecular weight polyacrylamide (HPAM), and its viscosity-increasing ability mainly depends on High molecular weight, but for this viscosity-increasing approach, the shear degradation of macromolecules is prone to occur during the dissolution and injection process, especially in the injection of low-permeability reservoirs, and the molecular chain size is large, which is easy to block low-permeability reservoirs reservoir pores. In addition, due to poor temperature resistance and salt resistance, the application of HPAM in high temp...

Claims

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Application Information

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IPC IPC(8): C09K8/588
Inventor 钟传蓉邓俊尚琼彭谋胡国金
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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