Experimental Study on Enhanced Oil Recovery by Nitrogen-Water Alternative Injection in Reservoir with Natural Fractures

Table 5

Mean response statistics of orthogonal experiments.

No.	Gas-water slug ratio	Injection velocity	Injection volume in one cycle
1	24.42	23.36	24.63
2	24.69	23.90	24.85
3	24.55	24.53	24.68
4	22.63	24.48	22.11
Delta (range)	2.06	1.17	2.74
Order	2	3	1