Abstract:

Polymer A was synthesized by aqueous solution polymerization used acrylic acid and acrylamide with potassium persulfate as initiator. Organic modified bentonite sample was prepared by mixing extrusion method with polymer A as an organic modifier.The structure and morphology of the sample were examined by Xray diffraction (XRD), Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscopy (SEM).The results show that the crystal spacing of the organic modified bentonite changes from 1.269 to 1.322 nm, and the organic modified bentonite still maintains the layered structure with organic groups in the layer.The organic modified bentonite was successfully prepared.Drilling fluids were prepared by this organic modified bentonite to study the fluid loss property and other properties.When the mass fraction was 4%, the viscosity of the drilling fluid was 5.5 mPa·s, and the fluid loss and lubrication coefficient were 13 mL and 0.13, respectively. The results show that the fluid loss and lubrication coefficient of the drilling fluid of organic modified bentonite reduce greatly and the rheology improves, compared with drilling fluid of ordinary sodium bentonite.