The effect of inorganic salt precipitation on oil recovery during CO₂ flooding: A case study of Chang 8 block in Changqing oilfield, NW China

YUAN Zhou,LIAO Xinwei,ZHANG Kuaile,ZHAO Xiaoliang,CHEN Zhiming

Table 2 Reaction results of different formation water samples under different pressure differences and temperatures.

Formation water sample	Tempera- ture/°C	Pressure difference/MPa	Precipitate amount/mg
1	20	8	310
	20	10	330
	20	12	390
	20	16	510
	30	16	220
	50	16	150
	80	16	70
2	20	8	170
	20	10	200
	20	12	170
	20	16	240
	30	16	190
	50	16	100
	80	16	50
3	20	8	300
	20	10	470
	20	12	480
	20	16	570
	30	16	480
	50	16	240
	80	16	80