Experimental Study on the Oil Recovery Performance of CO₂ Huff-and-Puff Process in Fractured Tight Oil Reservoirs

Table 4

The oil recovery factor of different pores after huff-and-puff tests with different soaking time.

Core number	Pore types	Soaking time
		12 h (%)	24 h (%)
Core #1	Micro pores (≤5 ms)	26.27	33.98
	Medium pores (5∼100 ms)	82.12	87.14
	Large pores (≥100 ms)	87.13	90.50
	Total	68.23	70.92
Core #5	Micro pores (≤5 ms)	0.00	6.16
	Medium pores (5∼100 ms)	16.00	31.33
	Large pores (≥100 ms)	47.13	59.46
	Total	14.79	23.71