The Preparation and Performances of Self-Dispersed Nanomicron Emulsified Wax Solid Lubricant Ewax for Drilling Fluids

Table 3

Impact of Ewax on drilling fluid rheology.

Mud type	Ewax additive dosage/wt%	AV/mPa·s	PV/mPa·s	YP/Pa	Gel10′′/10′/(Pa/Pa)	FLAPI/(mL/30 min)
Fresh water based mud^a	0	13.5	7.0	6.5	6.5/12.0	14.0
	1.0	15.5	8.0	7.5	6.0/11.5	12.2
Drilling fluid^bc	0	13.5	11.0	2.5	1.0/1.0	10.0
	1.0	13.5	10.0	3.5	1.0/1.0	9.6

Remarks: ^afresh water based mud is 6.0 wt% sodium-bentonite based mud.
^bDrilling fluid is 4.0 wt% sodium-bentonite based mud + 0.2 wt% HV-CMC + 0.3 wt% NPAN + 0.2 wt% SiM + 0.1 wt% KPAM.
^cHV-CMC is technical-grade high-viscosity carboxymethylcellulose as viscositier; NPAN is hydrolysed ammonium polyacrylonitrile as filter loss control agent; SiM is silicone grafted starch film former as inhibitor; KPAM is potassium copolymer of acrylamide and acrylic acid as flocculant.