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

Table 4

Experimental results of antisalting out of PMHA.

Concentration of CaCl2 (mg/L)	0	500	1500	2500	4000	5000
Solution transmission ratio of PMHA	98.8	98.4	98.0	96.2	95.4	94.5
Solution transmission ratio of DCL-a	99.0	99.0	98.8	98.6	98.4	98.1
Solution transmission ratio of HTRTP	98.3	98.2	98.1	98.0	97.8	97.5