During this step {TAIL ~ the base fluid} injected into the subterranean formation may contain {HEAD ~ a very small size particle}, such as a 100 mesh silica sand, which is also known as Oklahoma No 1 
During this step { TAIL ~ the base fluid } injected into the subterranean formation may contain { HEAD ~ a very small size particle } , such as a 100 mesh silica sand , which is also known as Oklahoma No 1
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH