In general, {HEAD ~ the enclosure member} is preferably prepared from a material which is permeable to a fluid existing in {TAIL ~ the subterranean environment} or which is injected with the capsules into the formation 
In general , { HEAD ~ the enclosure member } is preferably prepared from a material which is permeable to a fluid existing in { TAIL ~ the subterranean environment } or which is injected with the capsules into the formation
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH