This paper is aimed at studying the ability of three different polysilicon nanoparticles (PSNP) to enhance oil recovery. Changing rock wettability is the target because wettability is a primary factor that affects recovery efficiency. The experiments conducted centered on laboratory coreflooding using two kinds of oil, brine and polysilicon nanofluids on water wet rocks obtained from the Niger Delta. The three kinds of PSNP used for this study were lipophobic and hydrophilic PSNP (LHPN), hydrophobic and lipophilic PSNP (HLPN) and neutrally wet PSNP (NWPN).
The results obtained indicate that NWPN and HLPN are good enhanced oil recovery (EOR) agents in water wet formations. Two mechanisms through which oil recovery is enhanced using NWPN and HLPN are change of rock wettability and reduction of interfacial tension by the improved quality of ethanol, the dispersing agent. Thus NWPN and HLPN dispersed in ethanol are recommended for use in EOR for water wet formations. LHPN which make already water wet rocks strongly water wet yield poor recovery factors indicating that its use for EOR should be restricted to oil wet formations.