Oil-Based Drilling Fluid Plugging Method for Strengthening Wellbore Stability of Shale Gas

Table 10

Stability evaluation results of strong plugging drilling fluid.

System	Improved VST settlement test method					Settlement stability	Electrical stability
Formula CN-5	Volume (mL)	Mass (g)			Density difference (g/mL)	Density difference between upper and lower layers (g/mL)	Demulsification voltage (V)
		600r	100r	The difference
	10	19.42	20.06	0.64	0.064	0.019	1322