The fiber aggregates are useful, for example, for {HEAD ~ flowback control} in wellbores and {TAIL ~ reservoirs} 
The fiber aggregates are useful , for example , for { HEAD ~ flowback control } in wellbores and { TAIL ~ reservoirs }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL