Alerting Excessive Choke Increase Impact on Water and or Gas Production Responses Vs.Oil Cumulative-PredOPT

摘要

Angola's O&G business environment has shifted from Exploration to Production,and from Drilling to Well Intervention for obvious reasons of current and projected state of the E&P industry where operations are squeezed by volatile oil prices and higher operating costs.Operators in quest to maintain production plateau resolve in excessive choke increase.Therefore,a focus on predicting resulting HWcut and or HGor over time becomes significant as 75% of fields are under fluid injection for a balance voidage replacement.This study uses fields in Angola for conventional diagnostics decline curve analysis.Using plots of cumulative oil vs GOR,Pressure,Water cut and choke,to analyses the water and or gas production responses vs.oil cumulative to the excessive choke change.To have a complete sense of the impact,PI is included to consider oil production with respect to pressure drawdown.This study where mainly focused in clastic deposits.This approach may help anticipate the production of water due to excessive increase in choke sizes.It is expected that depending on the provenance of the water,it is concluded that excessive choke variation can be problematic in the future.A possible warning or alert is generated for any future choke change and hence oil production is optimized.An excel macro coding-PredOPT(Prediction and Optimization)is developed for the analysis and plugged-in to commercial software for the ease of applicability.