Title

SiO₂ Nanoparticle-Assisted Low-Concentration Viscoelastic Cationic Surfactant Fracturing Fluid

Abstract

Attributing to its advantages including no residue, low friction and complete gel breaking, viscoelastic surfactant (VES) fracturing fluids are attracting more and more attention. However, high price and high consumption restrict the wide applications of VES. SiO2 nanoparticle-assisted VES fracturing fluid (NAVES) with low concentration is proposed in this study. The NAVES system consisting of 1% EDAA and 0.01% SiO2 maintains a shear viscosity of above 33 mPa·s at 70 °C for 2 h; in contrast, the viscosity of a 1% EDAA (VES) solution is 24 mPa·s at 70 °C for 2 h. This could be attributing to the formation of a strong dynamic network structure, in which the surfactant micelles attach to the surface of SiO2 nano-particles that are negatively charged through electrostatic interactions. The pseudo-crosslinking between the SiO2 and micelles also improves the shear resistance and relaxation time of the VES, without affecting the gel breaking performance. The NAVES system could break completely within 100 min, as reflected by the fact that its viscosity decreased to less than 3 mPa·s. The settling rate of quartz sand in an EDAA/SiO2 system at 25 °C was 0.0021 cm/s, which was lower than that of traditional VES fracturing fluid. Therefore, NAVES could serve as a low-concentration hydraulic fracturing fluid. In addition, the current study provides a cost-effective approach for hydraulic fracturing.

Department(s)

Geosciences and Geological and Petroleum Engineering

Comments

This study was financially supported by the National Science and Technology Major Project ( 2017ZX05009-004 ), National Natural Science Foundation of China (No. 51774309 ), the Science Foundation of China University of Petroleum, Beijing (No. 2462015YJRC033 ) and at Karamay (No. RCYJ2017A-01-001 ).

Keywords and Phrases

Cationic surfactant; Fracturing fluid; Rheology; SiO2 nanoparticle; Viscoelasticity

International Standard Serial Number (ISSN)

0167-7322

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Elsevier B.V., All rights reserved.

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