A New Multichelating Acid System for High-Temperature Sandstone Reservoirs

Table 4

Chelating agent’s effect on silica gel precipitate.

Sample	30 min		90 min		120 min
	Concentration of Si (mg/L)	Amount of silica gel precipitate (mg)	Concentration of Si (mg/L)	Amount of silica gel precipitate (mg)	Concentration of Si (mg/L)	Amount of silica gel precipitate (mg)
No chelating agent; (2000 mg/L)	1243.12	129.48	765.29	211.22	586.44	241.82
Chelating agent added; (4000 mg/L)	3810.63	32.39	3613.13	66.18	3020.63	167.54