Dynamic Under/Overbalance: A Review of the Current Practices in Block 15

Abstract

Completion with anchored guns instead of killing techniques have been used extensively in Ecuador since 2008, completing 111 works to date only in Block 15. During this process several continuous improvement practices as well as new completion techniques were implemented including:Job design improvements:Productivity improvements:• Significant reduction in both perforating and completion skins using static and dynamic underbalance.This paper shows different case studies of completion and perforating designs that enabled to reduce skin as well as completion time in Block 15. A new completion procedure using anchored guns with dual concentric completion is also described. Objectives• To show the new operational and completion design practices that enabled to reduce drilling rig time (monobore completion), completion time and perforating skin • To show the standard completion design that includes anchored guns as the current practice in new wells, reentries, dual concentric completions and low pressure sand reservoirs.