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Composite foam system with nanoparticles added for oil and gas fields and preparation method thereof

A composite foam and nanoparticle technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability and poor foaming volume, achieve improved stability, strong foam stabilization ability, and slow down gas diffusion Effect

Active Publication Date: 2014-10-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research and development of foaming agents mainly focus on the synthesis or compounding of surfactants. However, due to the influence of the nature of surfactants, although sufficient foaming volume can be generated, their stability is poor.
In order to increase the stability of the bubbles, polyacrylamide, polyvinyl alcohol, protein, polypeptide and other polymers are added to the foaming agent. These substances mainly increase the viscosity of the base liquid and reduce the fluidity of the foam, thereby achieving the effect of stabilizing the foam. , but its foam volume is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The anionic surfactant is sodium dodecyl sulfate (SDS), the particle size of modified silica nanoparticles is 12nm, and the counter ion salt is sodium chloride.

[0043] Select 1.5g of sodium chloride, add it to 100ml of distilled water and stir thoroughly. Select 0.5 g of sodium lauryl sulfate and 1.5 g of modified silica nanoparticles, and add them to the counter ion solution in sequence, stir with a magnetic stirrer for 1 hour, and let stand for 10 minutes, and use Waring Stirring at 8000rpm for 3 minutes by the Blender method produced a stable foam. At room temperature, the measured foaming volume of the product is 520mL, and the half-life is 1725s, showing very good foaming and stability.

Embodiment 2

[0045] The anionic surfactant is sodium dodecyl sulfate (SDS), the particle size of modified silica nanoparticles is 12nm, and the counter ion salt is calcium chloride.

[0046] Select 0.06g of calcium chloride, add it into 100ml of distilled water and stir thoroughly. Select 0.5 g of sodium lauryl sulfate and 1.5 g of modified silica nanoparticles, and add them to the counter ion solution in sequence, stir with a magnetic stirrer for 1 hour, and let stand for 10 minutes, and use Waring Stirring at 8000rpm for 3 minutes by the Blender method produced a stable foam. At room temperature, the foaming volume of the product was measured to be 515mL, and the half-life was 1290s, showing very good foaming properties and stability.

Embodiment 3

[0048] The anionic surfactant is sodium dodecyl sulfate (SDS), the particle size of modified silica nanoparticles is 12nm, and the counter ion salt is magnesium chloride.

[0049] Select 0.08g of sodium chloride, add it into 100ml of distilled water and stir thoroughly. Select 0.5 g of sodium lauryl sulfate and 1.5 g of modified silica nanoparticles, and add them to the counter ion solution in sequence, stir with a magnetic stirrer for 1 hour, and let stand for 10 minutes, and use Waring Stirring at 8000rpm for 3 minutes by the Blender method produced a stable foam. At room temperature, the foaming volume of the product was measured to be 533mL, and the half-life was 1201s, showing very good foaming properties and stability.

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Abstract

The invention relates to a nanoparticle-added composite foam system used for an oil and gas field and a preparation method thereof. The composite foam system comprises components of, by mass, 0.3 to 0.5 parts of an anionic surfactant, 1 to 1.5 parts of modified silica nanoparticles, 0.03 to 2.3 parts of counter-ion salt, and 100 parts of water. The method comprises mixing the abovementioned components according to ratio, stirring by using a magnetic stirrer, standing, and then rapidly stirring to form well stable foam using a Waring Blender way. According to the composite foam system, the produced foam has a longer half life than that of foam stabilized by ordinary surfactant, and a larger start-foaming volume than that generated by adding a foam stabilizer The system has advantages of simple formula and preparation technology and good salt tolerance and temperature tolerance, can adapt to complex oil reservoir condition underground, does not pollute stratum, is capable of effectively blocking large channels and improving sweeping efficiency, and thus has good application prospects in oil field exploitation, especially in foam displacement.

Description

technical field [0001] The invention relates to a composite foam system added with nanoparticles for oil and gas fields and a preparation method thereof, belonging to the technical field of oil and gas field development and production engineering. Background technique [0002] At present, foam fluid has shown great application potential in various aspects of drilling, oil and gas well stimulation, workover, and enhanced oil recovery in the petroleum industry. Foam fluid generally refers to the dispersion system formed by insoluble or slightly soluble gas dispersion and liquid. Since the gas is surrounded by a liquid film, it determines that the foam has low friction, low density, low filtration loss, and damage to the formation. The foam has the advantages of being small, and the foam has a sealing effect on the high-permeability layer, and has the effect of increasing the swept volume on the low-permeability layer. Therefore, the foaming ability and half-life of foam are v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594C09K8/584
Inventor 李兆敏李松岩孙乾王继乾李宾飞安志波
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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