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Research Papers: Petroleum Engineering

Impact of Hydrophobicity of SiO2 Nanoparticles on Enhancing Properties of Colloidal Gas Aphron Fluids: An Experimental Study

[+] Author and Article Information
Amir Hossein Hassani

Chemical and Petroleum Engineering
Department,
Sharif University of Technology,
Azadi Avenue, P.O. Box 11365-9465,
Tehran 11365-11155, Iran
e-mail: amirh.hassani@yahoo.com

Mohammad Hossein Ghazanfari

Chemical and Petroleum Engineering
Department,
Sharif University of Technology,
Azadi Avenue, P.O. Box 11365-9465,
Tehran 11365-11155, Iran
e-mail: ghazanfari@sharif.edu

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 3, 2016; final manuscript received June 20, 2017; published online August 16, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(1), 012901 (Aug 16, 2017) (12 pages) Paper No: JERT-16-1317; doi: 10.1115/1.4037366 History: Received August 03, 2016; Revised June 20, 2017

In recent years, colloidal gas aphron (CGA) fluids have been much attended by researchers for their possible application in infill drilling, due to their pore blockage ability. In this study, the possible synergistic effect of silica nanoparticle hydrophobicity in the presence of sodium dodecyl sulfate (SDS), as a surface active agent, on enhancement of properties of CGA fluids was experimentally investigated. Results revealed that the hydrophobicity of nanoparticles, adsorbed at the bubble interface, plays an important role in improving stability and blockage ability at low as well as high pressure/temperature conditions, low shear rate viscosity (LSRV), and return permeability ability of CGA dispersion measured in a special radial sand pack apparatus at different levels of surfactant concentration. It was observed that partially hydrophobic SiO2 nanoparticles (nanosilica coated with KH550-Silane) yield a better performance than both strongly hydrophilic and hydrophobic nanoparticles (silicon dioxide nanopowder coated with 2 wt. % Silane) which confirms what is expected from the particle detachment theory. Optimal SDS concentrations equal to 0.25 wt. % for strongly hydrophilic, and 0.33 wt. % for both strongly hydrophobic and partially hydrophobic SiO2 nanoparticles were also found, which maximize the improving effect of CGA fluids. The superiority of the aphronized fluid improved by partially hydrophobic nanoparticles of SiO2 to CGA fluid stabilized only by surfactant makes the CGA fluids attractive for some industrial and drilling applications.

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References

Figures

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Fig. 1

Proposed structure of CGAs [1]

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Fig. 2

Radial setup and DBR pump

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Fig. 3

Schematic diagram of the cell designed for radial sand pack tests (all dimensions are in mm)

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Fig. 4

Representative schematic of the designed radial setup

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Fig. 5

Drained liquid volume for CGA fluid with strongly hydrophobic nanoparticle

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Fig. 6

Drained liquid volume for CGA fluid with strongly hydrophilic nanoparticle

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Fig. 7

Drained liquid volume for CGA mud with partially hydrophobic nanoparticle

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Fig. 8

Average drain rate (dv/dt) versus SDS concentration for various types of aqueous CGA drilling fluid

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Fig. 9

(a) CGA fluid deterioration due to density difference by the passage of time and (b) CGA size: A—at initial time, B—at 1.5 h, and C—at 3 h after preparation of fluid (magnification: ×100)

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Fig. 10

Filtrate volume for CGA mud with strongly hydrophobic nanoparticle

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Fig. 11

Filtrate volume for CGA mud with strongly hydrophilic nanoparticle

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Fig. 12

Filtrate volume for CGA mud with partially hydrophobic nanoparticle

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Fig. 13

Filtrate volume versus SDS concentration for different CGA drilling fluids

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Fig. 14

Filtrate volume for CGA mud with partially hydrophobic nanoparticle at different temperatures and pressure = 500 psi

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Fig. 15

Rheological behavior of CGA fluid containing strongly hydrophilic nanoparticle

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Fig. 16

Rheological behavior of CGA fluid containing strongly hydrophobic nanoparticle

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Fig. 17

Rheological behavior of CGA fluid containing partially hydrophobic nanoparticle

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Fig. 18

Viscosity versus SDS concentration at fixed shear rate for various aqueous CGA drilling fluids

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