EDC has developed an internal capability for predicting reservoir behavior. An example of this predictive capability is the Leyte Sweetspot study which was based on a risk analysis approach to determine the level of generation to be maintained for the field in the next 10 years, given the long production history and present subsurface condition in the field.
“Sweetspot generation” is a level of generation wherein the reservoir management issues are managed with sufficient mitigation measures. We employed numerical and statistical modeling to better understand the reservoir and wellbore processes affecting the steam availability of Leyte. Parameters such as steam flow decline rate, pressure decline and well retirement, cooling, deposition, were then identified and correlated with the extraction level to determine how the risk level changes as a function of the steam generation.
The Leyte Sweetspot study produced an optimum steam production level for Leyte. At this level of steam extraction, the team believes that the field can be sustainably operated for the next 10 years without overwhelming resource management issues.