Formation damage due to asphaltene precipitation during CO2 flooding processes with NMR technique | Oil & Gas Science and Technology

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Table 4

T₂ spectrum distribution obtained from NMR tests for the three core samples.

Core no.	Injection condition		T₂ distribution (%)
Core no.	Injection condition		0.1–1 ms	1–10 ms	10–100 ms	100–1000 ms
		Before CO₂ flooding	14.07	38.50	35.87	11.55
2–1	9.1 MPa	After CO₂ flooding	15.19	38.56	35.19	11.06
		Difference	+1.12	+0.06	−0.68	−0.49
		Before CO₂ flooding	11.84	32.97	39.00	16.19
2–3	16.2 MPa	After CO₂ flooding	12.22	34.93	37.84	15.01
		Difference	+0.38	+1.96	−1.16	−1.18
		Before CO₂ flooding	13.12	20.71	49.32	16.85
2–5	22.1 MPa	After CO₂ flooding	16.13	20.97	48.18	14.72
		Difference	+3.01	+0.27	−1.15	−2.13

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