Referring now to FIG 1, an isometric view of generally accepted prior art graphs, which are superimposed over a subterranean strata column with {TAIL ~ two bore arrangements} relating {HEAD ~ subterranean depths} to slurry densities and equivalent pore and fracture gradient pressures of subterranean strata are shown 
Referring now to FIG 1 , an isometric view of generally accepted prior art graphs , which are superimposed over a subterranean strata column with { TAIL ~ two bore arrangements } relating { HEAD ~ subterranean depths } to slurry densities and equivalent pore and fracture gradient pressures of subterranean strata are shown
OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH