A kind of ultra-long carbon chain double hydrophilic head group hydrophobic monomer and preparation method thereof

Abstract

The invention discloses a superlong carbon chain amphiphilic waterhead-based hydrophobic monomer used for oil field fracturing fluid and increase of recovery ratio and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: (1) dissolving 0.2 mol dibromoethane in acetone, dropwise adding 0.1 mol dimethylaminoethyl methacrylate into acetone solution under stirring condition, and reacting for 4 hours at room temperature, so that N,N-dimethyl bromoethyl methylacryloyl oxyethyl ammonium bromide intermediate is obtained; and (2) adding 0.05 mol intermediate and 0.055 mol erucamide propyl dimethyl tertiary amine into ethanol, and reacting for 24 hours at room temperature, so that the superlong carbon chain amphiphilic waterhead-based hydrophobic monomer is obtained. The hydrophobic monomer has stronger hydrophobic property, has better polymerization activity, is simple in preparation method and easy to separate and has a broad application prospect in the oil field fracturing fluid and increase of recovery ratio.

Description

technical field

[0001] The invention relates to an oil field fracturing fluid and an ultra-long carbon chain amphiphilic head group hydrophobic monomer for enhancing recovery and a preparation method thereof. Background technique

[0002] Hydrophobic association polymer refers to a water-soluble polymer with a small amount of hydrophobic functional monomers on the polymer molecular chain. Due to the introduction of a small amount of hydrophobic monomers, in the polymer solution, the association of hydrophobic monomers occurs, causing the polymer molecules to aggregate and form a supramolecular structure, thereby exhibiting special rheological properties, good thickening, Temperature resistance, salt resistance, shear resistance and other properties have received widespread attention, and have been widely used in oilfield fracturing fluids and enhanced oil recovery.

[0003] Hydrophobic association polymers usually use polymerizable surfactants as hydrophobic monomers, and m...

Examples

Embodiment 1

[0014] Example 1 Preparation of ultra-long carbon chain double hydrophilic head group hydrophobic monomer according to the steps

[0015] (1) Dissolve 0.2 mole of dibromoethane in acetone, add 0.1 mole of dimethylaminoethyl methacrylate dropwise to the acetone solution under stirring conditions, react at room temperature for 4 hours, and remove the solvent by distillation under reduced pressure , recrystallized with acetone to obtain N,N-dimethyl bromoethyl methacryloyloxyethyl ammonium bromide intermediate;

[0016] (2) Add 0.05 mole of the intermediate and 0.055 mole of erucamide propyl dimethyl tertiary amine to ethanol, react at room temperature for 24 hours, remove the solvent by distillation under reduced pressure, and recrystallize with acetone to obtain the ultra-long carbon chain amphiphile Hydrophobic monomers based on hydroheads.

Embodiment 2

[0017] Polymerization performance of embodiment 2 ultra-long carbon chain double hydrophilic head group hydrophobic monomer

[0018] The hydrophobic monomer with a mole fraction of 0.8% and the acrylamide with a mole fraction of 99.2% were formulated into an aqueous solution with a monomer concentration of 20%, and nitrogen gas was passed for half an hour, and the temperature was raised to 45°C and an initiator was added. The polymerization reaction was 8h, and the Ethanol is separated, purified and dried to obtain a hydrophobic association polymer. The prepared associative polymer has good associative viscosity-increasing performance, the critical association concentration is only 0.2%, and the 0.5% polymer solution is in 170s -1 The lower viscosity reaches more than 220mPa.s, and it has strong hydrophobic association performance.

technical field

[0001] The invention relates to an oil field fracturing fluid and an ultra-long carbon chain amphiphilic head group hydrophobic monomer for enhancing recovery and a preparation method thereof. Background technique

[0002] Hydrophobic association polymer refers to a water-soluble polymer with a small amount of hydrophobic functional monomers on the polymer molecular chain. Due to the introduction of a small amount of hydrophobic monomers, in the polymer solution, the association of hydrophobic monomers occurs, causing the polymer molecules to aggregate and form a supramolecular structure, thereby exhibiting special rheological properties, good thickening, Temperature resistance, salt resistance, shear resistance and other properties have received widespread attention, and have been widely used in oilfield fracturing fluids and enhanced oil recovery.

[0003] Hydrophobic association polymers usually use polymerizable surfactants as hydrophobic monomers, and m...

Examples

Embodiment 1

[0014] Example 1 Preparation of ultra-long carbon chain double hydrophilic head group hydrophobic monomer according to the steps

[0015] (1) Dissolve 0.2 mole of dibromoethane in acetone, add 0.1 mole of dimethylaminoethyl methacrylate dropwise to the acetone solution under stirring conditions, react at room temperature for 4 hours, and remove the solvent by distillation under reduced pressure , recrystallized with acetone to obtain N,N-dimethyl bromoethyl methacryloyloxyethyl ammonium bromide intermediate;

[0016] (2) Add 0.05 mole of the intermediate and 0.055 mole of erucamide propyl dimethyl tertiary amine to ethanol, react at room temperature for 24 hours, remove the solvent by distillation under reduced pressure, and recrystallize with acetone to obtain the ultra-long carbon chain amphiphile Hydrophobic monomers based on hydroheads.

Embodiment 2

[0017] Polymerization performance of embodiment 2 ultra-long carbon chain double hydrophilic head group hydrophobic monomer

[0018] The hydrophobic monomer with a mole fraction of 0.8% and the acrylamide with a mole fraction of 99.2% were formulated into an aqueous solution with a monomer concentration of 20%, and nitrogen gas was passed for half an hour, and the temperature was raised to 45°C and an initiator was added. The polymerization reaction was 8h, and the Ethanol is separated, purified and dried to obtain a hydrophobic association polymer. The prepared associative polymer has good associative viscosity-increasing performance, the critical association concentration is only 0.2%, and the 0.5% polymer solution is in 170s -1 The lower viscosity reaches more than 220mPa.s, and it has strong hydrophobic association performance.

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