Application of Novel Colloidal Silica Nanoparticles in the Reduction of Adsorption of Surfactant and Improvement of Oil Recovery Using Surfactant Polymer Flooding

Abstract

Surfactant polymer flooding is one of the most common chemical enhanced oil recovery techniques, which improves not only the microscopic displacement of the fluid through the formation of the emulsion but also the volumetric sweep efficiency of the fluid by altering the viscosity of the displacing fluid. However, one constraint of surfactant flooding is the loss of the surfactant by adsorption onto the reservoir rock surface. Hence, in this study, an attempt has been made to reduce the adsorption of the surfactant on the rock surface using novel colloidal silica nanoparticles (CSNs). CSNs were used as an additive to improve the performance of the conventional surfactant polymer flooding. The reduction in adsorption was observed in both the presence and absence of a polymer. The presence of a polymer also reduced the adsorption of the surfactant. Addition of 25 vol % CSNs effectively reduced the adsorption of up to 61% in the absence of a polymer, which increased to 64% upon the introduction of 1000 ppm polymer in the solution at 2500 ppm of the surfactant concentration at 25 °C. The adsorption of surfactant was also monitored with time, and it was found to be increasing with respect to time. The adsorption of surfactant increased from 1.292 mg/g after 0.5 days to 4.179 mg/g after 4 days at 2500 ppm of surfactant concentration at 25 °C. The viscosity, surface tension, and wettability studies were also conducted on the chemical slug used for flooding. The addition of CSNs effectively reduced the surface tension as well as shifted the wettability toward water-wet at 25 °C. Sand pack flooding experiments were performed at 60 °C to access the potential of CSNs in oil recovery, and it was found that the addition of 25 vol % CSNs in the conventional surfactant polymer chemical slug aided in the additional oil recovery up to 5% as compared to that of the conventional surfactant polymer slug.

Enhanced Oil Recovery from the Methyl Ester Sulfonate Derived from Flaxseed Oil: Interfacial, Adsorption and Rock Wetting Characteristics

“…The fluid flows through an indirect path inside the reservoir due to its complexity. Hence, it becomes obligatory to examine the flow characteristics of the slug to be pumped into the reservoir [71,72] . The chemical slug viscometry was explored over a broad range of shear rates.…”

“…Hence, it becomes obligatory to examine the flow characteristics of the slug to be pumped into the reservoir. [71,72] The chemical slug viscometry was explored over a broad range of shear rates. The viscosity of the slug was found to be reducing at a higher shear rate.…”

Evaluation of Silicon Carbide Nanoparticles as an Additive to Minimize Surfactant Loss during Chemical Flooding

“…The presence of SCN offers additional repulsive force to the negatively charged surfactant particles due to its negative surface charge. [26] This leads to micellization even at lower concentrations. Another possible reason for the decrease in the CMC is the increase in the ionic strength of the solution in the presence of nanoparticles which could enhance the surfactant micellization.…”

“…It is known that nanoparticles tend to agglomerate at higher concentrations. [12,26] This aggregation is the reason behind the change in the experimental trends at 300 ppm or above. Thus, 200 ppm of SCN was deemed the ideal concentration to minimize the adsorption of surfactants.…”

Impact of low‐molecular‐weight poly(4‐styrenesulfonic acid‐co‐maleic acid) sodium salt on filtration and rheological parameters of nanoparticles‐enhanced drilling fluid

“…Equation 4was restructured into a straight line to plot the viscosity data. [53] The parameters of the power law equations were obtained using the intercept and slope of the straight-line equation (Table 3). It can be inferred from the table that the value of the flow behavior index for all the mud formulations at different temperatures lies in the range of 0 and 1 suggesting the shear-thinning behavior of the mud.…”