Experiment in relative permeabilities and two-phase transient theory
A series of pressure transients were observed at BR21, a high-enthalpy well. The variation in transient behavior with enthalpy gives some indication of the form of relative permeability functions for fractured media. The consistent form of the observed transients indicates that two-phase transient observations can be used to determine reservoir parameters.
The compressibility and hydraulic diffusivity of a water‐steam flow
Physical parameters are defined for a flow of water and steam in a porous medium: dynamic and kinematic viscosity, density, and compressibility. These permit single-phase pressure transient theory to be applied to two-phase flow provided that the pressure changes are not too large.
Heat Recovery Systems
Geothermal energy is recovered from an underground zone of relatively hot strata via a borehole into which is inserted a heat pipe system containing a working fluid, the heat pipe system comprising an assembly of two tubes in concentric relation, the inner tube being constituted by a relatively small diameter capillary for the return of working fluid to the vicinity of the zone of the relatively hot strata. The working fluid is preferably assisted in its return under gravity by means of a pump. The system includes heat exchange means operable to recover thermal energy from the working fluid. A third and outermost tube may be used to reduce heat losses, this third tube enclosing the two tubes over all but that part of their length which is in the zone of relatively hot strata.