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

Table 4

Comparison of HTHP filtration loss control ability.

Sample	Fresh water based mud^a		Brine based mud^b		Brine based mud; Aged at high temperature^c
	𝐴^d	𝐵^e	𝐴	𝐵	𝐴	𝐵
Based mud	29.0	—	78.0	—	98.0	—
Ewax	19.0	34.5	38.0	51.3	49.0	50.0
DZ	25.0	13.8	75.0	3.9	—	—
DY	24.5	15.5	74.5	4.5	—	—

Remarks: ^afresh water based mud is 6.0% bentonite based mud.
^bBrine based mud is 6.0% bentonite based mud added 4.0% NaCl.
^cBrine based mud aged at high temperature is 6.0% bentonite based mud added 4.0% NaCl aged at 120°C for 16 h.
^d𝐴 is filter loss in mL/30 min.
^e𝐵 is reducing rate of water loss in percent.