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Amphiphilic modified nanoparticles, emulsion thereof and high-temperature-resistant high-density reversible oil-based drilling fluid

A nanoparticle and emulsion technology, applied in the field of oil drilling fluid, can solve the problems of low system density and so on

Active Publication Date: 2022-05-13
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research made the oil-based drilling fluid system reversible and temperature resistant by introducing pH-responsive nanoparticles, the system density was too low

Method used

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  • Amphiphilic modified nanoparticles, emulsion thereof and high-temperature-resistant high-density reversible oil-based drilling fluid
  • Amphiphilic modified nanoparticles, emulsion thereof and high-temperature-resistant high-density reversible oil-based drilling fluid
  • Amphiphilic modified nanoparticles, emulsion thereof and high-temperature-resistant high-density reversible oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Preparation and Characterization of Amphiphilic Modified Nanoparticles

[0048] (1) Preparation of amphiphilic modified nanoparticles

[0049] In the embodiment of the present invention, according to figure 1 Preparation according to the preparation method and structure shown: Add 0.24ml of 98% pure hydrophilic silane coupling agent KH-550 to the mixed solution of 80mL of absolute ethanol and 10mL of deionized water, stir magnetically for 5min to promote hydrolysis, add granules SiO with a diameter of 50-100nm 2 1 g of particles was ultrasonically dispersed for 10 min, then ammonia water and 0.94 ml of lipophilic silane coupling agent OTS with a purity of 98% were added in sequence, and the mixture was stirred under magnetic force at 60°C for 6 h. After the reaction, centrifuge at 8000 rpm for 10 min, and then wash with absolute ethanol. So centrifuged, washed, repeated 2 times. Finally, the centrifuged precipitate was vacuum-dried at 60 °C for 12 h to obt...

Embodiment 2

[0055] Example 2 Preparation of ultra-high temperature resistant emulsion

[0056] In the implementation of the present invention, the preparation method of the ultra-high temperature resistant emulsion is: the emulsifier, amphiphilic modified nanoparticles OTS-KH550 / SiO 2 Dissolve in the oil phase in turn, slowly add CaCl under high-speed stirring at 10000r / min 2 aqueous solution, and continuously stirred for 40 min to obtain the ultra-high temperature resistant emulsion containing the above-mentioned amphiphilic nanoparticles.

[0057] In the embodiment of the present invention, the ultra-high temperature resistant emulsion is prepared according to the following formula: 3# white oil and CaCl with a concentration of 25%-35% 2 The volume ratio of the aqueous solution is 50:50-70:30, the emulsifier content is 3w / v%-4w / v%, the amphiphilic nanoparticles OTS-KH550 / SiO prepared in Example 1 2 The mass percentage is 0.5%-1%.

[0058] In the embodiment of the present invention, t...

Embodiment 3

[0062] Embodiment 3 Anti-ultrahigh temperature emulsion breaking voltage

[0063] In the embodiment of the present invention, the emulsion was placed at 180°C, 200°C, 225°C, and 250°C for continuous hot rolling aging, aging at each temperature for 16 hours, standing for 2 hours after each aging, and testing the demulsification voltage.

[0064] (1) When CN-2 is selected as the emulsifier in Example 2 alone, and the concentration rises from 2% to 4%, the prepared emulsion (without modified nanoparticles) will be clearly delaminated and demulsified after aging at 180°C The voltage dropped from above 300V to close to 0V; the concentration of emulsifier CN-2 increased from 2% to 4%, which failed to significantly improve the temperature resistance of the emulsion. The results were as follows Figure 5 shown.

[0065] (2) When the emulsifier in Example 2 selects CN-2 alone, the concentration rises from 3w / v% to 4w / v%, and adds 1w / v% modified nanoparticles CTAB / SiO 2 The prepared u...

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Abstract

The invention belongs to the technical field of petroleum drilling fluid, and particularly relates to amphiphilic modified nanoparticles, emulsion of the amphiphilic modified nanoparticles and high-temperature-resistant high-density reversible oil-based drilling fluid. The preparation method of the amphiphilic modified nanoparticles comprises the following steps: (1) adding a hydrophilic silane coupling agent KH-550 into an absolute ethyl alcohol solution for hydrolysis, and (2) then adding hydrophilic SiO2 particles for dispersion treatment; and (3) adding ammonia water and an oleophylic silane coupling agent OTS for reaction to obtain the amphiphilic modified nanoparticles. The high-temperature-resistant high-density reversible oil-based drilling fluid containing the amphiphilic modified nanoparticles not only meets the requirements of high temperature resistance (greater than or equal to 180 DEG C), high density (greater than or equal to 1.8 g / cm < 3 >) and good drilling performance, but also has the advantages of easiness in water washing, low oil-water ratio and simple components.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling fluid, and in particular relates to an amphiphilic modified nano particle and its emulsion, and a high-temperature-resistant high-density reversible oil-based drilling fluid. Background technique [0002] Oil-based drilling fluid has become an important means of drilling shale gas horizontal wells, deep wells and ultra-deep wells due to its advantages of strong inhibition, good lubricity, high temperature resistance and anti-pollution ability. However, the high-temperature and high-density stability of domestic oil-based drilling fluids is generally poor, and it is difficult to meet the needs of high-temperature deep well drilling. In recent years, scholars at home and abroad have tried to use granular emulsifiers instead of traditional organic emulsifiers to improve the high-temperature emulsification stability of oil-based drilling fluids. For example: Sushant Agarwal et al. compound...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/36
CPCC09K8/03C09K8/36
Inventor 任妍君蒋官澄翟玉芬路岩岩王贵游利军
Owner SOUTHWEST PETROLEUM UNIV
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