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Nano-foam oil-displacing agent and preparation method thereof

A technology of nano-foam and oil-displacing agent, which is applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc. Emulsion stabilization performance, effect of suppressing gas diffusion

Active Publication Date: 2021-02-19
滨州市广友石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the foam of the existing foam oil displacement agent is unstable when encountering oil, the present invention provides a nano-foam oil displacement agent, which improves the foam stability of the foam oil displacement agent by adding oily nanoparticles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The nano foam oil displacement agent provided by the embodiment of the present invention comprises the following components in weight percentage: 30% of sodium alkylsulfonate, 10% of betaine, 10% of oily nanoparticles, 7% of polyacrylamide, dodecyl Trimethylammonium bromide 1.5%, the balance is water.

[0024] The preparation method of above-mentioned nano foam oil displacement agent comprises the steps:

[0025] (1) Preparation of oily silica particles:

[0026] Disperse the solid paraffin and silicon dioxide particles in water, use a high-speed emulsifier to stir at 300r / min for 4 minutes to emulsify them, cool the emulsion after emulsification, and rinse the solidified paraffin emulsion droplets without adsorbed silicon dioxide particles, Dry the solidified paraffin emulsion in vacuum at a temperature of 60°C, then disperse it into an ethanol solution containing isooctanoic acid, filter out the paraffin emulsion after the reaction, and rinse the surface of the paraf...

Embodiment 2

[0030] The nano-foam oil displacement agent that the embodiment of the present invention provides comprises the following components by weight percentage: 45% of sodium alkylsulfonate, 15% of betaine, 12% of oily silicon dioxide particles, 10% of polyacrylamide, dodecyl Sodium alkylbenzene sulfonate 2%, the balance is water.

[0031] The preparation method of above-mentioned nano foam oil displacement agent comprises the steps:

[0032] (1) Preparation of oily silica particles:

[0033] Disperse solid paraffin and silicon dioxide in water, use a high-speed emulsifier to stir at 400r / min for 5 minutes to emulsify it, cool the emulsion after emulsification, rinse the unadsorbed silicon dioxide particles on the surface of the solidified paraffin emulsion droplet, and put The cured paraffin emulsion drops are vacuum-dried at 70°C, and then dispersed into an ethanol solution containing isooctanoic acid. After the reaction, the paraffin emulsion drops are filtered out, and the surf...

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Abstract

The invention belongs to the technical field of oil extraction in oil fields, and particularly relates to a nano-foam oil-displacing agent and a preparation method thereof. The oil-displacing agent comprises the following components in percentage by weight: 10-45% of an anionic surfactant, 7-15% of a zwitterionic surfactant, 6-12% of oily nanoparticles, 5-10% of a stabilizer, 1-2% of a dispersingagent and the balance of water. The preparation method of the oil-displacing agent comprises the following steps: preparing oily nanoparticles from solid paraffin and isocaprylic acid, dispersing theoily nanoparticles in water, conducting uniform mixing with a surfactant, and adding a stabilizer and water to prepare the nano-foam oil-displacing agent. The nano-foam oil-displacing agent can effectively inhibit gas diffusion, enhance the mechanical stability and viscosity of a liquid film, effectively prevent external heat from being transferred to the inside, reduce the molecular thermal motion rate, greatly reduce the liquid separation rate of a foam liquid film, enhance the stability of foam and further improve the oil-displacing efficiency.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and in particular relates to a nano-foam oil displacement agent and a preparation method thereof. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. After primary and secondary extraction of underground crude oil, most of the crude oil remains in the formation. The tertiary oil recovery technology is a technology that uses chemical agents to enhance oil recovery. Among them, foam flooding is considered to be a promising tertiary oil recovery method because of its good plugging performance and selectivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/88C09K8/94E21B43/22
CPCC09K8/584C09K8/602C09K8/882C09K8/94E21B43/16C09K2208/10
Inventor 饶天利徐壮举徐涛徐淑君郭芳刘波
Owner 滨州市广友石油科技有限公司
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