In accordance with the process, an aqueous alkaline chemical solution is introduced into or formed in {TAIL ~ the well bore} penetrating {HEAD ~ the formation} 
In accordance with the process , an aqueous alkaline chemical solution is introduced into or formed in { TAIL ~ the well bore } penetrating { HEAD ~ the formation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD