Plugging Agent of Shale Base on Nano Flexible Polymer

Abstract

In this paper, the nano flexible polymer was synthesized and the plugging property of the polymer in the drilling fluid was studied. The characterization and properties of nano flexible polymer were invested by Particle Size Analyzer and Transmission Electron Microscopy. The nano flexible polymer was synthesized successfully and it was flexible nano material both in water and in drilling fluid. The filtration ability of the polymer was studied by drilling fluid filter press and the results indicated that the filtration property was equal to commonly used fluid loss agent in drilling fluid. The plugging ability was studied by specific surface and porosity physical adsorption instrument (BET). The surface area reduced after treated with the polymer, indicating the nano flexible polymer entered into nanopores of shale formation due to the adsorption in the surface of shale. It was further exhibited that nanopores of shale were plugged by the nano flexible polymer.