Superhydrophobic Surface Fabrication for Strengthened Selective Water Shut-off Technology

Abstract

A two-step solution immersion method was used to successfully fabricate a superhydrophobic film on the surface of the core, which can effectively separate oil and water. The optimal reagent concentration of the superhydrophobic surface was 1.0 wt % aminopropyl triethoxysilane + 0.7 wt % stearoyl chloride + 0.2 wt % triethylamine, suitable for reservoirs with a formation temperature around 40–100 °C, and the maximum contact angle of the prepared superhydrophobic surface was 155° with a sliding angle smaller than 3°. A scanning electron microscope and a contact angle measuring instrument were used to characterize the surface. Displacement experiments and oil–water separation experiments demonstrated that the superhydrophobic surface could significantly change the wettability of the formation and have a good selective water shut-off performance. The presented method is rapid and convenient and thus should be of significant value for the industrial fabrication of the superhydrophobic surface and should have a promising future in selective water shut-off in oilfields.

Facile Fabrication of Povidone Iodine‐Embedded Polytetrafluoroethylene Superhydrophobic Films with Improved Antiadhesive and Bactericidal Properties in Bacterial Environments

“…An increase in hydrophobicity can lead to the rough surface. [ 30,31 ] In contrast, PTFE/PVP (60:25) films appeared to display quite smooth surface without any obvious surface protrusions. The AFM results were consistent with those of SEM.…”

The Hole Sealing Technology of Solid–Liquid Materials with Three Pluggings and Two Injections for Gas Extraction Hole in the Coal Mine

“…The pendant drop method was used to measure the surface tension of the sealing slurry, and the shape of a drop was measured at the moment a pendant drop fell. The image contour of the drop was fitted with a computer, and the surface tension of the sealing slurry was calculated …”

“…The image contour of the drop was fitted with a computer, and the surface tension of the sealing slurry was calculated. 40 The contact angle measuring method was used to measure the contact angle of the sealing slurry. First, the briquettes with a flat surface and uniform thickness were selected as samples.…”

“…The image contour of the drop was fitted with a computer, and the surface tension of the sealing slurry was calculated. 40 …”