Synthesis of a Novel Filtrate Reducer and Its Application in Water-Based Drilling Fluid for Ultra-High-Temperature Reservoirs

Table 6

Comparison of fluid loss controlling of fluid loss agents in weighted fresh water slurry.

Experimental slurry	Test conditions	AV (mPa·s)	PV (mPa·s)	YP (Pa)	API (mL)
3-2 basic slurry	Room temperature after 220°C/16 h	35	16	19	16.0
	Room temperature after 245°C/16 h	38	26	12	21.0
1% PMHA	Room temperature after 220°C/16 h	33.5	27	6.5	8.4
1% DCL-a	Room temperature after 245°C/16 h	45	35	10	6.6
1% HTRTP	Room temperature after 245°C/16 h	41	32	9	6.0