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