Nitrogen injection to enhance methane and water production: An experimental study using the LF-NMR relaxation method

Nitrogen injection is an effective way to improve coalbed methane (CBM) recovery, but there are few studies of the regularity of fluid flow during nitrogen injection. To study the flow of methane and water during nitrogen injection into coal reservoirs, a high-volatile bituminous B coal from the southern margin of the Junggar Basin, Xinjiang and a low-volatility bituminous coal from the central and eastern regions of the Qinshui Basin, Shanxi...