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

Table 8

Test results of filter cake compressibility.

Formula	Test conditions	(mL)	(mL)
Basic slurry:	Room temperature	22	43	1.95
	Room temperature after 220°C/16 h	34	72	2.12
	Room temperature after 245°C/16 h	42	90	2.14
	Room temperature	8.6	16	1.86
	Room temperature after 220°C/16 h	12	23.4	1.95
	Room temperature	12	21	1.75
	Room temperature after 245°C/16 h	20	36	1.80
	Room temperature	8	12.8	1.60
	Room temperature after 245°C/16 h	11.6	19	1.64