Synergy of Nano Silica and Anionic Surfactant Fluid as Chemical Enhanced Oil Recovery

Khasan Rowi; Agus Subagio; Ngadiwiyana; Heydar Ruffa Taufiq; Muhammad Mufti Azis; Bayu Dedi Prasetiyo; Victor Sitompul; Sumadi Paryoto; Denie Tirta Winata; Tino Diharja; Michael Arya Yutaka; Abimanyu Putra Syarifudin; Wahyu Firmansyah; Hary Koestono

doi:10.29017/scog.v48i4.1951

Authors

Khasan Rowi Universitas Diponegoro
Agus Subagio Universitas Diponegoro
Ngadiwiyana Universitas Diponegoro
Heydar Ruffa Taufiq Universitas Diponegoro
Muhammad Mufti Azis Universitas Gadjah Mada
Bayu Dedi Prasetiyo BBPMGB LEMIGAS
Victor Sitompul PT Pertamina (Persero)
Sumadi Paryoto PT Pertamina (Persero)
Denie Tirta Winata PT Pertamina (Persero)
Tino Diharja PT Pertamina (Persero)
Michael Arya Yutaka PT Pertamina (Persero)
Abimanyu Putra Syarifudin PT Pertamina (Persero)
Wahyu Firmansyah PT Pertamina (Persero)
Hary Koestono PT Pertamina (Persero)

DOI:

https://doi.org/10.29017/scog.v48i4.1951

Keywords:

silica nano fluid, enhanced oil recovery (EOR), thermal stability, core flooding, wettability

Abstract

Silica nanofluids attract significant attention for enhanced oil recovery (EOR) applications due to their ability to alter rock wettability. However, silica nanofluids exhibit limitations in thermal stability. The addition of anionic surfactants aims to overcome these limitations. The synergisticAnionic surfactants are added to address the thermal stability issues of silica nanofluids. The synergy interaction between silica nanoparticles (SNPs) and anionic surfactants enhances wettability alteration, reduces interfacial tension (IFT), improves thermal stability, and increasing oil recovery. This study investigates the synergistic effects of SNPs, alpha olefin sulfonate (AOS) surfactant, and disodium laureth sulfosuccinate (DLS) co-surfactant in nanofluid formulations applied to sandstone reservoirs. Laboratory experiments employ colloidal nano silica with two particle sizes, 8 nm (SNP-01) and 3 nm (SNP-02), combined with AOS-DLS anionic surfactants at various concentrations . The study showed that the silica nanofluid remains stable for up to 3 months at temperatures below 80°C for both SNP types at a concentration of 0.1% with surfactant concentrations 0.3% AOS and 0.3% DLS in 3% brine solution. The addition of SNPs decreases the contact angle, whereas surfactants do not significantly affect the contact angle; however, surfactant effectively reduce the IFT, while nano silica shows minimal influence on IFT values. Core flooding analysis showed that the SNP-02 nanofluid produced the highest recovery factor of 12.1% OOIP. Futhermore, SEM analysis showed that silica nanofluid injection removes surfactant impurities and enhances rock porosity.

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