Abstract
At present, animal bone glue has widely used in many fields, but there are no researches been reported in drilling fluids. In this paper, an environmental water-based drilling fluids additive bromoethane modified bone glue (BG) was developed by using bovine bone glue and bromoethane as raw materials, anhydrous ethanol as solvent, sodium hydroxide as alkaline hydrolysis agent and sodium carbonate as a system pH regulator. The inhibition and filtration performance of BG were evaluated. When 4% BG was added, the linear swelling rate was decreased from 50.2%% to 38.2%. The temperature resistance of BG was investigated, and results showed that BG showed good inhibition at 130°C. Microstructure of BG was observed by scanning electron microscope (SEM), it can be seen that BG structure was stabled. Inhibition mechanism of BG in the drilling fluids was studied by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Zeta potential and thermogravimetric (TG) analysis. Results revealed that its main functional groups were adsorbed in the clay. TGA showed that when 4% BG was added, the basic slurry's thermal stability was improved, and Zeta potential analysis revealed that when 4% BG was added, the drilling fluids' particle size has been declined from 1.251 µm to 0.749 µm, which indicated that the BG can inhibit clay hydration swelling dispersion.