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