steam drillers, page-19

Onepot
You wrote "I want to understand how the field size / boundary is established. I want to understand how the water molecules at this boundary behave / move."

My understanding is as follows:
# Any voids in granite are full of superheated water naturally (Remember it used to be called hot dry rocks. Well its wet)
# Applied pressure of 9000 psi has fractured an area some 2km (X direction arbitrary) by 3 km (Y direction) by 100metres deep (Z direction.)
# In terms of boundaries there is the original boundary which to my understanding the granite has a very limited (neglible) porosity though by virtue of the fact that it saturated I assume it has some porosity.)
# The 2nd boundary to consider is the boundary established by the fracturing. Relative to the naturally occuring fractures these are large.
# I understand that there is expected to be nil or neglible loss of water once the system is primed and operational
# The tracers which are to be added to the water during the closed circulation testing I expect will answer a lot of questions as to the primary water movements, effective surface area of the system and if any water is lost from the system.