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

Table 5

Experimental results of emulsifying agent optimization.

System	Condition	AV; (mPa·s)	PV; (mPa·s)	YP; (Pa)	Gel10/Gel10; (Pa/Pa)	FLAPI; (mL)	Demulsification voltage (V)
Base slurry 1	Before aging	4.5	4	0.5	0.51/1.02	50.0	2047
	After aging	4	3	1	0.51/1.02	30.0
EM-SL	Before aging	7	6	1	0	13.0	1101
	After aging	12	9	3	1.53/1.53	10.0
EM-JH	Before aging	8	6	2	0	17.0	1012
	After aging	12	9	3	2.04/2.56	13.0
EM-XG	Before aging	5.5	5	0.5	0	22.4	990
	After aging	12	9	3	1.53/1.53	18.0