| Title | Instability in Well Performance |
|---|---|
| Authors | Grant, Malcolm A.; Bixley, Paul F.; Syms, Margot C. |
| Year | 1979 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Reservoir Engineering; Fractured Reservoirs; Well Flow; Feed Points; New Zealand; North Island; Wairakei; Liquid Dominated; Flow Pulse; Pressure Oscillations; Injection Tests; Pressure Gradient; Well Log; Multiple Feeds; Spinner; Open Hole; DSIR |
| Abstract | Instability in performance of a geothermal well, under discharge or injection, is caused by multiple feed points in the well. Fluids of varying enthalpy enter and flow in the well. Fluid density and the pressure difference between the two feeds consequently varies, and feedback between this pressure difference and the flow from each feed point causes transient or sustained oscillations in pressure, enthalpy and mass flow at the wellhead. Unless such internal flows in the well are recognized, downhole pressure and temperature data will be wrongly interpreted. |