Environment-friendly drilling fluid prepared from nanocellulose and preparation method of environment-friendly drilling fluid

The invention provides an environment-friendly drilling fluid prepared from nanocellulose and a preparation method of the environment-friendly drilling fluid, and relates to the technical field of oil field drilling fluids. The environment-friendly drilling fluid is prepared from components in percentage by mass as follows: 4%-6% of bentonite-based slurry, 1%-2% of nano cellulose, 0.5%-1.5% of an inhibitor, 0.1%-0.5% of a tackifier, 0.2%-0.4% of a coating agent, 0.8%-1.4% of a filtrate reducer, 2%-3% of a lubricant, 2%-3% of a plugging anti-collapse agent, 0.1%-0.3% of an alkalinity regulator and the balance of water. According to the invention, the prepared nanocellulose can form a spatial network structure in the drilling fluid, and the structure can be damaged under the shearing action and can be quickly reconstructed, so that the rheological property of the drilling fluid is improved. And the prepared nanofiber can be gathered at the well wall to form a filter cake with better sealing property under a hig