The second fracturing fluid comprises {TAIL ~ the base fluid}, sand, possibly a crosslinker, and one or both of {HEAD ~ an adhesive and consolidation agent} 
The second fracturing fluid comprises { TAIL ~ the base fluid } , sand , possibly a crosslinker , and one or both of { HEAD ~ an adhesive and consolidation agent }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD