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

Table 7

Comparison of fluid loss controlling of fluid loss agents in saturated brine slurry.

Experimental slurry	Test conditions	AV (mPa·s)	PV (mPa·s)	YP (Pa)	API (mL)
Basic slurry	Room temperature after 220°C/16 h	18	8	10	124
	Room temperature after 245°C/16 h	17.5	6	11.5	143
1.5% PMHA	Room temperature after 220°C/16 h	16.5	9	7.5	49
1.5% DCL-a	Room temperature after 245°C/16 h	40	19	21	24
1.5% HTRTP	Room temperature after 245°C/16 h	45	24	21	18