The enclosure member is permeable to at least one fluid in the subterranean formation or injected with the capsules such that upon {HEAD ~ sufficient exposure} to {TAIL ~ the fluid}, the capsules rupture, thereby releasing the breaker to the formation 
The enclosure member is permeable to at least one fluid in the subterranean formation or injected with the capsules such that upon { HEAD ~ sufficient exposure } to { TAIL ~ the fluid } , the capsules rupture , thereby releasing the breaker to the formation
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH