Laboratory Study on Core Fracturing Simulations for Wellbore Strengthening

Table 4

Formulas and properties of drilling fluids.

Number	Formula	(g/cm^3)
1	Water-based drilling fluid: 4% bentonite slurry + 2% SMP-2 + 0.3% CMC-HV	1.04
2	Oil-based drilling fluid: white oil + water (25% of oil weight) + 2% primary emulsifier MOEMUL+ 2% coemulsifier MOCOAT + 2% CaO + 1% filtrate reducer JFL-1 + CaCl2 (25% of water weight) + 0.5% shear-strength improving agent TQ-1	0.902