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

Table 7

Experimental results of lubricant optimization.

System	Condition	AV; (mPa·s)	PV; (mPa·s)	YP; (Pa)	Gel10/Gel10; (Pa/Pa)	FLAPI; (mL)	Lubrication coefficient	Coefficient of viscosity
Base slurry 4	Before aging	12.5	11	1.5	1.02/1.53	5.5	0.0509	0.2493
	After aging	12	9	3	1.02/1.53	7.8
Liquid rare earth	Before aging	12.5	9	3.5	1.02/1.53	5.6	0.0307	0.2309
	After aging	12	11	1	0.51/1.02	4.4
Jiahua	Before aging	12	9	3	1.02/1.53	6	0.0305	0.2217
	After aging	13.5	11	2.5	1.53/1.53	6.4
Graphite RT-1	Before aging	12.5	11	1.5	1.02/1.02	6	0.0205	0.1584
	After aging	12	9	3	1.02/1.53	7.6