Method determines brine density for HPHT wells

The petroleum industry uses solids-free brines for completion and work over fluids. Operators must use brine densities sufficient to produce the required overbalance for well control, usually 200 psi above bottomhole reser voir pressure, depending on the operation. Engineers, therefore, need to know downhole fluid densities accurately.High pressure, high-temperature (HPHT) wells cause brine densities to vary significantly from measured surface values. Calculations have shown that bottomhole pressures predicted with constant surface densities to be in error by hundreds of psi.The authors present a pressure-density-temperature dependent equation-of-state for sodium chloride brine. Workers c...

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