Structural polymer foam stabilizer for foam fracturing and method for preparing structural polymer foam stabilizer

Abstract

The invention provides a structural polymer foam stabilizer for foam fracturing and a method for preparing the structural polymer foam stabilizer. The structural polymer foam stabilizer is characterized in that the foaming ratio of aqueous solution with 0.3 wt% of structural polymer foam stabilizer is higher than or equal to 600%, and the half life of the aqueous solution is longer than or equal to 12 h. The method includes steps of carrying out multilevel initiation polymerization on deionized water, solubilizers, water-soluble monomers with ethylene groups, structural monomers, anionic surface-active monomers, anionic surfactants, oxidation-reduction system initiators and azo-initiators to obtain polymerization products; heating the polymerization products until the temperatures of the polymerization products reach 80-95 DEG C and carrying out heat reaction for 8-24 h to allow the molecular weights of obtained polymers to be 2000-4000 thousands so as to obtain the structural polymer foam stabilizer. The structural polymer foam stabilizer and the method have the advantages that the structural polymer foam stabilizer is excellent in foam stabilization performance and efficient in foaming performance, high in sand carrying capacity and operability and low in cost and is temperature-resistant and shear-resistant, and excellent solubilization synergistic effects can be realized.

Description

technical field

[0001] The invention belongs to the technical field of polymer additives and oil production chemicals, and in particular relates to a structural polymer foam stabilizer for foam fracturing and a preparation method thereof. Background technique

[0002] Foam is a heterogeneous dispersion system of gas dispersed in liquid. Gas is the dispersed phase and liquid is the dispersion medium. In the process of preparing foam, under the action of density difference, the bubbles in the liquid are easy to form a liquid film composed of a small amount of liquid on the liquid surface to separate the gas bubble aggregation—foam. Foam fluid is a bubble dispersion system composed of gas. It has extremely high surface free energy and is a thermodynamically unstable system. Therefore, foam will decay. It is generally believed that there are two reasons: the precipitation of liquid in the foam and the diffusion of gas through the liquid film. Foam has been more and more used i...

Examples

preparation example Construction

[0048] The preparation method of above-mentioned foam stabilizer provided by the present invention may further comprise the steps:

[0049] Deionized water, solubilizer, water-soluble monomers containing vinyl groups, structural monomers, anionic surfactant monomers, anionic surfactants, redox system initiators, and azo initiators are used for multi-stage polymerization initiation , heating up to 80-95° C. for heat preservation and reaction for 8-24 hours, so that the molecular weight of the obtained polymer is 2-4 million, and the foam stabilizer is obtained;

[0050] Among them, in terms of mass percentage, 48-67% of deionized water, 3-5% of solubilizer, 25-35% of water-soluble monomers containing vinyl groups, 2-4% of structural monomers, anionic surface-active monomers 2-5%, anionic surfactant 1-3%, redox system initiator 0.1-0.5%, azo initiator 0.1-0.5%.

[0051] Its technical evaluation index is: the foaming rate of the aqueous solution containing 0.3% of the foam stabi...

Embodiment 1

[0054] Preparation and performance test of structural polymer foam stabilizer 1 for foam fracturing:

[0055] 1. Keep the temperature in the kettle at 10°C, add 74.85g of toluene to the monomer reaction kettle, then add 57g of octadecylamine and stir until dissolved, then add 18g of acrylic acid and 0.15g of sodium p-toluenesulfonate and stir until dissolved. After sealing the reaction kettle, heat up to 85°C, seal and separate the water produced by the reaction through a water separator, react for 24 hours, and then distill under reduced pressure at 80°C for 12 hours until there is no distillate, and the light yellow oil obtained in the reaction kettle after cooling to room temperature The solid is N-octadecylacrylamide.

[0056] 2. Keep the temperature in the kettle at 2°C, add 66g of octylene and 18g of acrylonitrile in turn to the monomer reaction kettle, stir until they are mutually soluble, then add 42g of fuming sulfuric acid dropwise for 1 hour, and react for another 2...

Embodiment 2

[0061] Preparation and performance test of structural polymer foam stabilizer 2 for foam fracturing:

[0062] 1. Keep the temperature in the kettle at 30°C, add 95g of toluene to the monomer reaction kettle, then add 84g of octylamine and stir until dissolved, then add 20g of acrylic acid and 1g of sodium p-toluenesulfonate and stir until dissolved. After closing the reaction kettle, heat up to 95°C, seal and separate the water produced by the reaction through a water separator, react for 20 hours, then distill under reduced pressure at 90°C for 8 hours until there is no distillate, and obtain a light yellow oil in the reaction kettle after cooling to room temperature The solid is N-octyl acrylamide.

[0063] 2. Keep the temperature in the kettle at 5°C, add 96g of octadecylene and 28g of acrylonitrile in turn to the monomer reaction kettle, stir until they are mutually soluble, then add 60g of fuming sulfuric acid dropwise for 0.5h, and then react for 1h. The temperature was...

technical field

[0001] The invention belongs to the technical field of polymer additives and oil production chemicals, and in particular relates to a structural polymer foam stabilizer for foam fracturing and a preparation method thereof. Background technique

[0002] Foam is a heterogeneous dispersion system of gas dispersed in liquid. Gas is the dispersed phase and liquid is the dispersion medium. In the process of preparing foam, under the action of density difference, the bubbles in the liquid are easy to form a liquid film composed of a small amount of liquid on the liquid surface to separate the gas bubble aggregation—foam. Foam fluid is a bubble dispersion system composed of gas. It has extremely high surface free energy and is a thermodynamically unstable system. Therefore, foam will decay. It is generally believed that there are two reasons: the precipitation of liquid in the foam and the diffusion of gas through the liquid film. Foam has been more and more used i...

Examples

preparation example Construction

[0048] The preparation method of above-mentioned foam stabilizer provided by the present invention may further comprise the steps:

[0049] Deionized water, solubilizer, water-soluble monomers containing vinyl groups, structural monomers, anionic surfactant monomers, anionic surfactants, redox system initiators, and azo initiators are used for multi-stage polymerization initiation , heating up to 80-95° C. for heat preservation and reaction for 8-24 hours, so that the molecular weight of the obtained polymer is 2-4 million, and the foam stabilizer is obtained;

[0050] Among them, in terms of mass percentage, 48-67% of deionized water, 3-5% of solubilizer, 25-35% of water-soluble monomers containing vinyl groups, 2-4% of structural monomers, anionic surface-active monomers 2-5%, anionic surfactant 1-3%, redox system initiator 0.1-0.5%, azo initiator 0.1-0.5%.

[0051] Its technical evaluation index is: the foaming rate of the aqueous solution containing 0.3% of the foam stabi...

Embodiment 1

[0054] Preparation and performance test of structural polymer foam stabilizer 1 for foam fracturing:

[0055] 1. Keep the temperature in the kettle at 10°C, add 74.85g of toluene to the monomer reaction kettle, then add 57g of octadecylamine and stir until dissolved, then add 18g of acrylic acid and 0.15g of sodium p-toluenesulfonate and stir until dissolved. After sealing the reaction kettle, heat up to 85°C, seal and separate the water produced by the reaction through a water separator, react for 24 hours, and then distill under reduced pressure at 80°C for 12 hours until there is no distillate, and the light yellow oil obtained in the reaction kettle after cooling to room temperature The solid is N-octadecylacrylamide.

[0056] 2. Keep the temperature in the kettle at 2°C, add 66g of octylene and 18g of acrylonitrile in turn to the monomer reaction kettle, stir until they are mutually soluble, then add 42g of fuming sulfuric acid dropwise for 1 hour, and react for another 2...

Embodiment 2

[0061] Preparation and performance test of structural polymer foam stabilizer 2 for foam fracturing:

[0062] 1. Keep the temperature in the kettle at 30°C, add 95g of toluene to the monomer reaction kettle, then add 84g of octylamine and stir until dissolved, then add 20g of acrylic acid and 1g of sodium p-toluenesulfonate and stir until dissolved. After closing the reaction kettle, heat up to 95°C, seal and separate the water produced by the reaction through a water separator, react for 20 hours, then distill under reduced pressure at 90°C for 8 hours until there is no distillate, and obtain a light yellow oil in the reaction kettle after cooling to room temperature The solid is N-octyl acrylamide.

[0063] 2. Keep the temperature in the kettle at 5°C, add 96g of octadecylene and 28g of acrylonitrile in turn to the monomer reaction kettle, stir until they are mutually soluble, then add 60g of fuming sulfuric acid dropwise for 0.5h, and then react for 1h. The temperature was...