Aquifer Boiling and Excess Enthalpy Wells
Analytical data presented in earlier chapters were used to calculate the single phase composition of aquifer fluid through a knowledge of the discharge enthalpy of the well. The assumptions made in this calculation are a) that a single phase is indeed present in the feed zone to the well and b) that no phase separation occurs underground to modify the original fluid composition. While valid for many wells, these assumptions are not universally true. In this chapter we shall examine the effects of underground boiling on the composition of well discharges in relation to original aquifer fluid. These effects are frequently seen in exploration well discharges but become common in production wells as a consequence of exploitation.