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