Preparation of SiO₂-Fluorinated Acrylate Polymer Nanoemulsions (SCFs) and Their Application as Depressurization and Injection Treatment Agents

Abstract

For water injection development in low-permeability reservoirs, nanoscale SiO2-fluorinated acrylate polymer nanoemulsions (SCFs) with good properties were prepared through core–shell emulsion polymerization. The results show that nano-SiO2 particles are well dispersed, the average particle size of the SCFs is 113 nm, and the synergy among fluoride chain segments is good and effectively improves the utilization of fluorine atoms. SCFs form a low-surface-energy nanoscale hydrophobic film on the rock surface, which changes the original rock surface micro- or nanostructure, resulting in a water contact angle of up to 120° at the core. At 60 °C, the interfacial tension (IFT) between a 1500 mg/L SCF dispersion and white mineral oil is 1.86 mN/m, decreasing by 95.67% relative to the oil–water IFT at room temperature. The core flooding experiment shows that the depressurization rate reaches 29.62% in the 1500 mg/L SCF dispersion. Therefore, SCFs have broad application prospects in processes that eliminate water lock, reduce injection pressure, and increase injection volume.

Effect of Interface Structure and Behavior on the Fluid Flow Characteristics and Phase Interaction in the Petroleum Industry: State of the Art Review and Outlook

“…In nanoemulsion flooding, to prepare the ideal nanoemulsion to improve nanoemulsion stability, several surfactants and nanoparticles must be tested in the laboratory to select the appropriate surfactant and nanoparticle according to the subsurface environment in which the interfacial system is located. , In this process, surfactant screening is required to optimize the surfactant formulation to make the surfactant compatible with nanoparticles, but this process is time-consuming . Moreover, surfactant screening is highly risky because it will determine the displacement efficiency of nanoemulsion flooding. , Another issue that greatly affects the displacement efficiency of nanoemulsion flooding is the adsorption behavior of the interface. The adsorption of various chemical components such as alkalis, surfactants, and polymers is affected by phase interactions and external environmental factors; therefore, different interface structures are formed under different conditions.…”

“…160 Moreover, surfactant screening is highly risky because it will determine the displacement efficiency of nanoemulsion flooding. 161,162 Another issue that greatly affects the displacement efficiency of nanoemulsion flooding is the adsorption behavior of the interface. The adsorption of various chemical components such as alkalis, surfactants, and polymers is affected by phase interactions and external environmental factors; therefore, different interface structures are formed under different conditions.…”

Influence of Pendant Fluoroalkyl Segments on Properties of Fluoroethylene and Vinyl Ether Polymers and Their Hydrophobic Coatings

“…The results showed that when the weight ratio of DFMA/MMA changes from 0:9 to 1:5, the WCA of the as-prepared film increases from 93.0 to 105.4°. Many studies have found that fluorine side chains show a strong tendency to aggregate to the surface. , At the same time, DFMA contains a highly reactive carbon–carbon double bond, which is easy to copolymerize with a variety of olefinic monomers. Guo et al synthesized aminopropyl triethoxysilane (APTES)-terminated block copolymers of APTES-poly­(methyl methacrylate)- b -poly­(DFMA) (APTES-PMMA- b -PDFMA) and APTES-polystyrene- b -PDFMA (APTES-PS- b -PDFMA) via atom transfer radical polymerization (ATRP).…”