Changes in Fluid Distribution at Ohaki

Abstract

In its initial state most of the permeable parts of Broadlands field contained a gassy phase fluid. tation, and its recovery, has been successfully modelled as the response of a single, well-mixed lump or blob. two-phase. The response of the field to exploi- This at all times remained When the field response is observed in more detail, some structure emerges. there developed under exploitation some vertical segregation and drainage. This was most strikingly manifested in discharge of dry steam. On recovery the field became wetter: the steam zone disappeared, while from 800 - a zone of single-phase liquid was created. effects were apparent below and it is concluded that this represents the bottom of the extensively permeable reservoir.