The inert gas is not reactive with the methane or with {TAIL ~ the subsequently injected hydrogen} and functions to reduce the methane partial pressure at a given coal bed total pressure to promote {HEAD ~ methane desorption} 
The inert gas is not reactive with the methane or with { TAIL ~ the subsequently injected hydrogen } and functions to reduce the methane partial pressure at a given coal bed total pressure to promote { HEAD ~ methane desorption }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD